Mercurial > hg > dmlib
annotate src/stb_image.c @ 899:63fd1801f983
Mangle new stb_image to our purposes.
author | Matti Hamalainen <ccr@tnsp.org> |
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date | Mon, 23 Feb 2015 19:49:58 +0200 |
parents | 83a8881c782b |
children | 88d9440afad0 |
rev | line source |
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83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
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1 /* stb_image - v2.02 - public domain image loader - http://nothings.org/stb_image.h |
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2 no warranty implied; use at your own risk |
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3 |
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4 Do this: |
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5 #define STB_IMAGE_IMPLEMENTATION |
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6 before you include this file in *one* C or C++ file to create the implementation. |
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7 |
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8 // i.e. it should look like this: |
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9 #include ... |
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10 #include ... |
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11 #include ... |
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12 #define STB_IMAGE_IMPLEMENTATION |
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13 #include "stb_image.h" |
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14 |
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15 You can #define STBI_ASSERT(x) before the #include to avoid using assert.h. |
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16 And #define STBI_MALLOC, STBI_REALLOC, and STBI_FREE to avoid using malloc,realloc,free |
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17 |
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18 |
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19 QUICK NOTES: |
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20 Primarily of interest to game developers and other people who can |
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21 avoid problematic images and only need the trivial interface |
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22 |
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23 JPEG baseline & progressive (12 bpc/arithmetic not supported, same as stock IJG lib) |
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24 PNG 1/2/4/8-bit-per-channel (16 bpc not supported) |
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25 |
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26 TGA (not sure what subset, if a subset) |
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27 BMP non-1bpp, non-RLE |
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28 PSD (composited view only, no extra channels) |
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29 |
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30 GIF (*comp always reports as 4-channel) |
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31 HDR (radiance rgbE format) |
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32 PIC (Softimage PIC) |
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33 PNM (PPM and PGM binary only) |
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34 |
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35 - decode from memory or through FILE (define STBI_NO_STDIO to remove code) |
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36 - decode from arbitrary I/O callbacks |
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37 - SIMD acceleration on x86/x64 (SSE2) and ARM (NEON) |
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38 |
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39 Full documentation under "DOCUMENTATION" below. |
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40 |
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41 |
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42 Revision 2.00 release notes: |
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43 |
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44 - Progressive JPEG is now supported. |
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45 |
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46 - PPM and PGM binary formats are now supported, thanks to Ken Miller. |
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47 |
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48 - x86 platforms now make use of SSE2 SIMD instructions for |
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49 JPEG decoding, and ARM platforms can use NEON SIMD if requested. |
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50 This work was done by Fabian "ryg" Giesen. SSE2 is used by |
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51 default, but NEON must be enabled explicitly; see docs. |
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52 |
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53 With other JPEG optimizations included in this version, we see |
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54 2x speedup on a JPEG on an x86 machine, and a 1.5x speedup |
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55 on a JPEG on an ARM machine, relative to previous versions of this |
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56 library. The same results will not obtain for all JPGs and for all |
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57 x86/ARM machines. (Note that progressive JPEGs are significantly |
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58 slower to decode than regular JPEGs.) This doesn't mean that this |
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59 is the fastest JPEG decoder in the land; rather, it brings it |
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60 closer to parity with standard libraries. If you want the fastest |
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61 decode, look elsewhere. (See "Philosophy" section of docs below.) |
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62 |
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63 See final bullet items below for more info on SIMD. |
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64 |
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65 - Added STBI_MALLOC, STBI_REALLOC, and STBI_FREE macros for replacing |
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66 the memory allocator. Unlike other STBI libraries, these macros don't |
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67 support a context parameter, so if you need to pass a context in to |
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68 the allocator, you'll have to store it in a global or a thread-local |
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69 variable. |
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70 |
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71 - Split existing STBI_NO_HDR flag into two flags, STBI_NO_HDR and |
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72 STBI_NO_LINEAR. |
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73 STBI_NO_HDR: suppress implementation of .hdr reader format |
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74 STBI_NO_LINEAR: suppress high-dynamic-range light-linear float API |
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75 |
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76 - You can suppress implementation of any of the decoders to reduce |
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77 your code footprint by #defining one or more of the following |
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78 symbols before creating the implementation. |
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79 |
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80 STBI_NO_JPEG |
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81 STBI_NO_PNG |
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82 STBI_NO_BMP |
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83 STBI_NO_PSD |
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84 STBI_NO_TGA |
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85 STBI_NO_GIF |
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86 STBI_NO_HDR |
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87 STBI_NO_PIC |
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88 STBI_NO_PNM (.ppm and .pgm) |
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89 |
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90 - You can request *only* certain decoders and suppress all other ones |
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91 (this will be more forward-compatible, as addition of new decoders |
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92 doesn't require you to disable them explicitly): |
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93 |
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94 STBI_ONLY_JPEG |
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95 STBI_ONLY_PNG |
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96 STBI_ONLY_BMP |
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97 STBI_ONLY_PSD |
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98 STBI_ONLY_TGA |
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99 STBI_ONLY_GIF |
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100 STBI_ONLY_HDR |
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101 STBI_ONLY_PIC |
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102 STBI_ONLY_PNM (.ppm and .pgm) |
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103 |
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104 Note that you can define multiples of these, and you will get all |
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105 of them ("only x" and "only y" is interpreted to mean "only x&y"). |
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106 |
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107 - If you use STBI_NO_PNG (or _ONLY_ without PNG), and you still |
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108 want the zlib decoder to be available, #define STBI_SUPPORT_ZLIB |
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109 |
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110 - Compilation of all SIMD code can be suppressed with |
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111 #define STBI_NO_SIMD |
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112 It should not be necessary to disable SIMD unless you have issues |
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113 compiling (e.g. using an x86 compiler which doesn't support SSE |
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114 intrinsics or that doesn't support the method used to detect |
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115 SSE2 support at run-time), and even those can be reported as |
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116 bugs so I can refine the built-in compile-time checking to be |
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117 smarter. |
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118 |
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119 - The old STBI_SIMD system which allowed installing a user-defined |
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120 IDCT etc. has been removed. If you need this, don't upgrade. My |
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121 assumption is that almost nobody was doing this, and those who |
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122 were will find the built-in SIMD more satisfactory anyway. |
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123 |
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124 - RGB values computed for JPEG images are slightly different from |
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125 previous versions of stb_image. (This is due to using less |
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126 integer precision in SIMD.) The C code has been adjusted so |
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127 that the same RGB values will be computed regardless of whether |
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128 SIMD support is available, so your app should always produce |
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129 consistent results. But these results are slightly different from |
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130 previous versions. (Specifically, about 3% of available YCbCr values |
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131 will compute different RGB results from pre-1.49 versions by +-1; |
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132 most of the deviating values are one smaller in the G channel.) |
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133 |
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134 - If you must produce consistent results with previous versions of |
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135 stb_image, #define STBI_JPEG_OLD and you will get the same results |
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136 you used to; however, you will not get the SIMD speedups for |
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137 the YCbCr-to-RGB conversion step (although you should still see |
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138 significant JPEG speedup from the other changes). |
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139 |
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140 Please note that STBI_JPEG_OLD is a temporary feature; it will be |
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141 removed in future versions of the library. It is only intended for |
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142 near-term back-compatibility use. |
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143 |
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144 |
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145 Latest revision history: |
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146 2.02 (2015-01-19) fix incorrect assert, fix warning |
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147 2.01 (2015-01-17) fix various warnings |
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148 2.00b (2014-12-25) fix STBI_MALLOC in progressive JPEG |
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149 2.00 (2014-12-25) optimize JPEG, including x86 SSE2 & ARM NEON SIMD |
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150 progressive JPEG |
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151 PGM/PPM support |
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152 STBI_MALLOC,STBI_REALLOC,STBI_FREE |
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153 STBI_NO_*, STBI_ONLY_* |
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154 GIF bugfix |
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155 1.48 (2014-12-14) fix incorrectly-named assert() |
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156 1.47 (2014-12-14) 1/2/4-bit PNG support (both grayscale and paletted) |
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157 optimize PNG |
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158 fix bug in interlaced PNG with user-specified channel count |
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159 1.46 (2014-08-26) fix broken tRNS chunk in non-paletted PNG |
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160 1.45 (2014-08-16) workaround MSVC-ARM internal compiler error by wrapping malloc |
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161 |
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162 See end of file for full revision history. |
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163 |
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164 |
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165 ============================ Contributors ========================= |
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166 |
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167 Image formats Bug fixes & warning fixes |
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168 Sean Barrett (jpeg, png, bmp) Marc LeBlanc |
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169 Nicolas Schulz (hdr, psd) Christpher Lloyd |
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170 Jonathan Dummer (tga) Dave Moore |
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171 Jean-Marc Lienher (gif) Won Chun |
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172 Tom Seddon (pic) the Horde3D community |
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173 Thatcher Ulrich (psd) Janez Zemva |
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174 Ken Miller (pgm, ppm) Jonathan Blow |
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175 Laurent Gomila |
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176 Aruelien Pocheville |
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177 Extensions, features Ryamond Barbiero |
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178 Jetro Lauha (stbi_info) David Woo |
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179 Martin "SpartanJ" Golini (stbi_info) Martin Golini |
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180 James "moose2000" Brown (iPhone PNG) Roy Eltham |
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181 Ben "Disch" Wenger (io callbacks) Luke Graham |
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182 Omar Cornut (1/2/4-bit PNG) Thomas Ruf |
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183 John Bartholomew |
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184 Ken Hamada |
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185 Optimizations & bugfixes Cort Stratton |
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186 Fabian "ryg" Giesen Blazej Dariusz Roszkowski |
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187 Arseny Kapoulkine Thibault Reuille |
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188 Paul Du Bois |
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189 Guillaume George |
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190 If your name should be here but Jerry Jansson |
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191 isn't, let Sean know. Hayaki Saito |
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192 Johan Duparc |
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193 Ronny Chevalier |
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194 Michal Cichon |
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195 Tero Hanninen |
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196 Sergio Gonzalez |
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197 Cass Everitt |
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198 Engin Manap |
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199 |
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200 License: |
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201 This software is in the public domain. Where that dedication is not |
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202 recognized, you are granted a perpetual, irrevocable license to copy |
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203 and modify this file however you want. |
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204 |
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205 */ |
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206 |
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207 #ifndef STBI_INCLUDE_STB_IMAGE_H |
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208 #define STBI_INCLUDE_STB_IMAGE_H |
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209 |
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210 // DOCUMENTATION |
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211 // |
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212 // Limitations: |
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213 // - no 16-bit-per-channel PNG |
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214 // - no 12-bit-per-channel JPEG |
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215 // - no JPEGs with arithmetic coding |
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216 // - no 1-bit BMP |
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217 // - GIF always returns *comp=4 |
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218 // |
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219 // Basic usage (see HDR discussion below for HDR usage): |
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220 // int x,y,n; |
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221 // unsigned char *data = stbi_load(filename, &x, &y, &n, 0); |
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222 // // ... process data if not NULL ... |
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223 // // ... x = width, y = height, n = # 8-bit components per pixel ... |
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224 // // ... replace '0' with '1'..'4' to force that many components per pixel |
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225 // // ... but 'n' will always be the number that it would have been if you said 0 |
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226 // stbi_image_free(data) |
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227 // |
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228 // Standard parameters: |
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229 // int *x -- outputs image width in pixels |
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230 // int *y -- outputs image height in pixels |
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231 // int *comp -- outputs # of image components in image file |
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232 // int req_comp -- if non-zero, # of image components requested in result |
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233 // |
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234 // The return value from an image loader is an 'unsigned char *' which points |
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235 // to the pixel data, or NULL on an allocation failure or if the image is |
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236 // corrupt or invalid. The pixel data consists of *y scanlines of *x pixels, |
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237 // with each pixel consisting of N interleaved 8-bit components; the first |
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238 // pixel pointed to is top-left-most in the image. There is no padding between |
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239 // image scanlines or between pixels, regardless of format. The number of |
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240 // components N is 'req_comp' if req_comp is non-zero, or *comp otherwise. |
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241 // If req_comp is non-zero, *comp has the number of components that _would_ |
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242 // have been output otherwise. E.g. if you set req_comp to 4, you will always |
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243 // get RGBA output, but you can check *comp to see if it's trivially opaque |
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244 // because e.g. there were only 3 channels in the source image. |
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245 // |
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246 // An output image with N components has the following components interleaved |
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247 // in this order in each pixel: |
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248 // |
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249 // N=#comp components |
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250 // 1 grey |
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251 // 2 grey, alpha |
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252 // 3 red, green, blue |
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253 // 4 red, green, blue, alpha |
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254 // |
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255 // If image loading fails for any reason, the return value will be NULL, |
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256 // and *x, *y, *comp will be unchanged. The function stbi_failure_reason() |
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257 // can be queried for an extremely brief, end-user unfriendly explanation |
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258 // of why the load failed. Define STBI_NO_FAILURE_STRINGS to avoid |
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259 // compiling these strings at all, and STBI_FAILURE_USERMSG to get slightly |
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260 // more user-friendly ones. |
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261 // |
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262 // Paletted PNG, BMP, GIF, and PIC images are automatically depalettized. |
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263 // |
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264 // =========================================================================== |
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265 // |
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266 // Philosophy |
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267 // |
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268 // stb libraries are designed with the following priorities: |
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269 // |
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270 // 1. easy to use |
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271 // 2. easy to maintain |
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272 // 3. good performance |
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273 // |
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274 // Sometimes I let "good performance" creep up in priority over "easy to maintain", |
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275 // and for best performance I may provide less-easy-to-use APIs that give higher |
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276 // performance, in addition to the easy to use ones. Nevertheless, it's important |
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277 // to keep in mind that from the standpoint of you, a client of this library, |
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278 // all you care about is #1 and #3, and stb libraries do not emphasize #3 above all. |
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279 // |
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280 // Some secondary priorities arise directly from the first two, some of which |
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281 // make more explicit reasons why performance can't be emphasized. |
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282 // |
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283 // - Portable ("ease of use") |
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284 // - Small footprint ("easy to maintain") |
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285 // - No dependencies ("ease of use") |
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286 // |
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287 // =========================================================================== |
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288 // |
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289 // I/O callbacks |
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290 // |
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291 // I/O callbacks allow you to read from arbitrary sources, like packaged |
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292 // files or some other source. Data read from callbacks are processed |
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293 // through a small internal buffer (currently 128 bytes) to try to reduce |
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294 // overhead. |
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295 // |
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296 // The three functions you must define are "read" (reads some bytes of data), |
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297 // "skip" (skips some bytes of data), "eof" (reports if the stream is at the end). |
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298 // |
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299 // =========================================================================== |
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300 // |
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301 // SIMD support |
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302 // |
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303 // The JPEG decoder will try to automatically use SIMD kernels on x86 when |
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304 // supported by the compiler. For ARM Neon support, you must explicitly |
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305 // request it. |
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306 // |
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307 // (The old do-it-yourself SIMD API is no longer supported in the current |
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308 // code.) |
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309 // |
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310 // On x86, SSE2 will automatically be used when available based on a run-time |
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311 // test; if not, the generic C versions are used as a fall-back. On ARM targets, |
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312 // the typical path is to have separate builds for NEON and non-NEON devices |
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313 // (at least this is true for iOS and Android). Therefore, the NEON support is |
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314 // toggled by a build flag: define STBI_NEON to get NEON loops. |
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315 // |
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316 // The output of the JPEG decoder is slightly different from versions where |
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317 // SIMD support was introduced (that is, for versions before 1.49). The |
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318 // difference is only +-1 in the 8-bit RGB channels, and only on a small |
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319 // fraction of pixels. You can force the pre-1.49 behavior by defining |
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320 // STBI_JPEG_OLD, but this will disable some of the SIMD decoding path |
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321 // and hence cost some performance. |
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322 // |
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323 // If for some reason you do not want to use any of SIMD code, or if |
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324 // you have issues compiling it, you can disable it entirely by |
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325 // defining STBI_NO_SIMD. |
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326 // |
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327 // =========================================================================== |
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328 // |
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329 // HDR image support (disable by defining STBI_NO_HDR) |
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330 // |
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331 // stb_image now supports loading HDR images in general, and currently |
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332 // the Radiance .HDR file format, although the support is provided |
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333 // generically. You can still load any file through the existing interface; |
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334 // if you attempt to load an HDR file, it will be automatically remapped to |
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335 // LDR, assuming gamma 2.2 and an arbitrary scale factor defaulting to 1; |
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336 // both of these constants can be reconfigured through this interface: |
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337 // |
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338 // stbi_hdr_to_ldr_gamma(2.2f); |
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339 // stbi_hdr_to_ldr_scale(1.0f); |
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340 // |
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341 // (note, do not use _inverse_ constants; stbi_image will invert them |
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342 // appropriately). |
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343 // |
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344 // Additionally, there is a new, parallel interface for loading files as |
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345 // (linear) floats to preserve the full dynamic range: |
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346 // |
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347 // float *data = stbi_loadf(filename, &x, &y, &n, 0); |
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348 // |
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349 // If you load LDR images through this interface, those images will |
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350 // be promoted to floating point values, run through the inverse of |
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351 // constants corresponding to the above: |
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352 // |
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353 // stbi_ldr_to_hdr_scale(1.0f); |
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354 // stbi_ldr_to_hdr_gamma(2.2f); |
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355 // |
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356 // Finally, given a filename (or an open file or memory block--see header |
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357 // file for details) containing image data, you can query for the "most |
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358 // appropriate" interface to use (that is, whether the image is HDR or |
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359 // not), using: |
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360 // |
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361 // stbi_is_hdr(char *filename); |
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362 // |
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363 // =========================================================================== |
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364 // |
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365 // iPhone PNG support: |
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366 // |
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367 // By default we convert iphone-formatted PNGs back to RGB, even though |
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368 // they are internally encoded differently. You can disable this conversion |
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369 // by by calling stbi_convert_iphone_png_to_rgb(0), in which case |
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370 // you will always just get the native iphone "format" through (which |
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371 // is BGR stored in RGB). |
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372 // |
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373 // Call stbi_set_unpremultiply_on_load(1) as well to force a divide per |
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374 // pixel to remove any premultiplied alpha *only* if the image file explicitly |
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375 // says there's premultiplied data (currently only happens in iPhone images, |
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376 // and only if iPhone convert-to-rgb processing is on). |
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377 // |
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378 |
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379 |
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380 #ifndef STBI_NO_STDIO |
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381 #include <stdio.h> |
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382 #endif // STBI_NO_STDIO |
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383 |
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384 #define STBI_VERSION 1 |
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385 |
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386 enum |
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387 { |
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388 STBI_default = 0, // only used for req_comp |
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389 |
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390 STBI_grey = 1, |
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391 STBI_grey_alpha = 2, |
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392 STBI_rgb = 3, |
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393 STBI_rgb_alpha = 4 |
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394 }; |
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395 |
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396 #ifdef __cplusplus |
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397 extern "C" { |
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398 #endif |
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399 |
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400 #ifdef STB_IMAGE_STATIC |
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401 #define STBIDEF static |
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402 #else |
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403 #define STBIDEF extern |
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404 #endif |
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405 |
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406 ////////////////////////////////////////////////////////////////////////////// |
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407 // |
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408 // PRIMARY API - works on images of any type |
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409 // |
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|
410 |
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Import newer version of stb_image.
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411 // |
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412 // load image by filename, open file, or memory buffer |
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413 // |
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414 |
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415 typedef struct |
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416 { |
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417 int (*read) (void *user,char *data,int size); // fill 'data' with 'size' bytes. return number of bytes actually read |
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418 void (*skip) (void *user,int n); // skip the next 'n' bytes, or 'unget' the last -n bytes if negative |
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419 int (*eof) (void *user); // returns nonzero if we are at end of file/data |
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420 } stbi_io_callbacks; |
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421 |
899
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422 STBIDEF Uint8 *stbi_load (char const *filename, int *x, int *y, int *comp, int req_comp); |
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423 STBIDEF Uint8 *stbi_load_from_memory (Uint8 const *buffer, int len , int *x, int *y, int *comp, int req_comp); |
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424 STBIDEF Uint8 *stbi_load_from_callbacks(stbi_io_callbacks const *clbk , void *user, int *x, int *y, int *comp, int req_comp); |
893
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425 |
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426 #ifndef STBI_NO_STDIO |
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427 STBIDEF Uint8 *stbi_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); |
893
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428 // for stbi_load_from_file, file pointer is left pointing immediately after image |
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429 #endif |
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430 |
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431 #ifndef STBI_NO_LINEAR |
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432 STBIDEF float *stbi_loadf (char const *filename, int *x, int *y, int *comp, int req_comp); |
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433 STBIDEF float *stbi_loadf_from_memory (Uint8 const *buffer, int len, int *x, int *y, int *comp, int req_comp); |
893
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434 STBIDEF float *stbi_loadf_from_callbacks (stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp); |
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435 |
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436 #ifndef STBI_NO_STDIO |
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437 STBIDEF float *stbi_loadf_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); |
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438 #endif |
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439 #endif |
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440 |
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441 #ifndef STBI_NO_HDR |
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442 STBIDEF void stbi_hdr_to_ldr_gamma(float gamma); |
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443 STBIDEF void stbi_hdr_to_ldr_scale(float scale); |
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444 #endif |
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445 |
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446 #ifndef STBI_NO_LINEAR |
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447 STBIDEF void stbi_ldr_to_hdr_gamma(float gamma); |
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448 STBIDEF void stbi_ldr_to_hdr_scale(float scale); |
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449 #endif // STBI_NO_HDR |
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450 |
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451 // stbi_is_hdr is always defined, but always returns false if STBI_NO_HDR |
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452 STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user); |
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453 STBIDEF int stbi_is_hdr_from_memory(Uint8 const *buffer, int len); |
893
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454 #ifndef STBI_NO_STDIO |
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455 STBIDEF int stbi_is_hdr (char const *filename); |
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456 STBIDEF int stbi_is_hdr_from_file(FILE *f); |
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457 #endif // STBI_NO_STDIO |
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458 |
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|
459 |
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460 // get a VERY brief reason for failure |
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461 // NOT THREADSAFE |
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|
462 STBIDEF const char *stbi_failure_reason (void); |
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|
463 |
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464 // free the loaded image -- this is just free() |
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465 STBIDEF void stbi_image_free (void *retval_from_stbi_load); |
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466 |
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467 // get image dimensions & components without fully decoding |
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|
468 STBIDEF int stbi_info_from_memory(Uint8 const *buffer, int len, int *x, int *y, int *comp); |
893
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|
469 STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp); |
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|
470 |
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|
471 #ifndef STBI_NO_STDIO |
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472 STBIDEF int stbi_info (char const *filename, int *x, int *y, int *comp); |
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473 STBIDEF int stbi_info_from_file (FILE *f, int *x, int *y, int *comp); |
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|
474 |
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|
475 #endif |
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|
476 |
83a8881c782b
Import newer version of stb_image.
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changeset
|
477 |
83a8881c782b
Import newer version of stb_image.
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changeset
|
478 |
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|
479 // for image formats that explicitly notate that they have premultiplied alpha, |
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|
480 // we just return the colors as stored in the file. set this flag to force |
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481 // unpremultiplication. results are undefined if the unpremultiply overflow. |
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|
482 STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply); |
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changeset
|
483 |
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changeset
|
484 // indicate whether we should process iphone images back to canonical format, |
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Import newer version of stb_image.
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485 // or just pass them through "as-is" |
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|
486 STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert); |
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diff
changeset
|
487 |
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diff
changeset
|
488 |
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Import newer version of stb_image.
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changeset
|
489 #ifdef __cplusplus |
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Import newer version of stb_image.
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diff
changeset
|
490 } |
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changeset
|
491 #endif |
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changeset
|
492 |
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Import newer version of stb_image.
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diff
changeset
|
493 // |
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diff
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|
494 // |
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Import newer version of stb_image.
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diff
changeset
|
495 //// end header file ///////////////////////////////////////////////////// |
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496 #endif // STBI_INCLUDE_STB_IMAGE_H |
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|
497 |
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changeset
|
498 #ifdef STB_IMAGE_IMPLEMENTATION |
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Import newer version of stb_image.
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changeset
|
499 |
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Import newer version of stb_image.
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changeset
|
500 #if defined(STBI_ONLY_JPEG) || defined(STBI_ONLY_PNG) || defined(STBI_ONLY_BMP) \ |
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|
501 || defined(STBI_ONLY_TGA) || defined(STBI_ONLY_GIF) || defined(STBI_ONLY_PSD) \ |
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502 || defined(STBI_ONLY_HDR) || defined(STBI_ONLY_PIC) || defined(STBI_ONLY_PNM) \ |
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Import newer version of stb_image.
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changeset
|
503 || defined(STBI_ONLY_ZLIB) |
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|
504 #ifndef STBI_ONLY_JPEG |
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changeset
|
505 #define STBI_NO_JPEG |
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changeset
|
506 #endif |
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changeset
|
507 #ifndef STBI_ONLY_PNG |
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|
508 #define STBI_NO_PNG |
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|
509 #endif |
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Import newer version of stb_image.
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diff
changeset
|
510 #ifndef STBI_ONLY_BMP |
83a8881c782b
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|
511 #define STBI_NO_BMP |
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changeset
|
512 #endif |
83a8881c782b
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diff
changeset
|
513 #ifndef STBI_ONLY_PSD |
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Import newer version of stb_image.
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diff
changeset
|
514 #define STBI_NO_PSD |
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diff
changeset
|
515 #endif |
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parents:
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diff
changeset
|
516 #ifndef STBI_ONLY_TGA |
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diff
changeset
|
517 #define STBI_NO_TGA |
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diff
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|
518 #endif |
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Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
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diff
changeset
|
519 #ifndef STBI_ONLY_GIF |
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Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
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diff
changeset
|
520 #define STBI_NO_GIF |
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Import newer version of stb_image.
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changeset
|
521 #endif |
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Import newer version of stb_image.
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diff
changeset
|
522 #ifndef STBI_ONLY_HDR |
83a8881c782b
Import newer version of stb_image.
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523 #define STBI_NO_HDR |
83a8881c782b
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diff
changeset
|
524 #endif |
83a8881c782b
Import newer version of stb_image.
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diff
changeset
|
525 #ifndef STBI_ONLY_PIC |
83a8881c782b
Import newer version of stb_image.
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diff
changeset
|
526 #define STBI_NO_PIC |
83a8881c782b
Import newer version of stb_image.
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diff
changeset
|
527 #endif |
83a8881c782b
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870
diff
changeset
|
528 #ifndef STBI_ONLY_PNM |
83a8881c782b
Import newer version of stb_image.
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diff
changeset
|
529 #define STBI_NO_PNM |
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Import newer version of stb_image.
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diff
changeset
|
530 #endif |
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parents:
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diff
changeset
|
531 #endif |
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Import newer version of stb_image.
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parents:
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diff
changeset
|
532 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
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diff
changeset
|
533 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
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diff
changeset
|
534 #include <stdarg.h> |
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Import newer version of stb_image.
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parents:
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diff
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|
535 #include <stddef.h> // ptrdiff_t on osx |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
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diff
changeset
|
536 #include <stdlib.h> |
83a8881c782b
Import newer version of stb_image.
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diff
changeset
|
537 #include <string.h> |
83a8881c782b
Import newer version of stb_image.
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diff
changeset
|
538 |
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Import newer version of stb_image.
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parents:
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diff
changeset
|
539 #if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) |
83a8881c782b
Import newer version of stb_image.
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parents:
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diff
changeset
|
540 #include <math.h> // ldexp |
83a8881c782b
Import newer version of stb_image.
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parents:
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diff
changeset
|
541 #endif |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
542 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
543 #ifndef STBI_NO_STDIO |
83a8881c782b
Import newer version of stb_image.
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parents:
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diff
changeset
|
544 #include <stdio.h> |
83a8881c782b
Import newer version of stb_image.
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parents:
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diff
changeset
|
545 #endif |
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Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
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diff
changeset
|
546 |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
547 #ifndef STBI_ASSERT |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
548 #include <assert.h> |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
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diff
changeset
|
549 #define STBI_ASSERT(x) assert(x) |
83a8881c782b
Import newer version of stb_image.
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parents:
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diff
changeset
|
550 #endif |
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Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
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diff
changeset
|
551 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
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diff
changeset
|
552 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
553 #define stbi_inline inline |
893
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
554 #define STBI_NOTUSED(v) (void)(v) |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
555 |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
556 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
557 #ifdef _MSC_VER |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
558 #define STBI_HAS_LROTL |
83a8881c782b
Import newer version of stb_image.
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parents:
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diff
changeset
|
559 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
560 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
561 #ifdef STBI_HAS_LROTL |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
562 #define stbi_lrot(x,y) _lrotl(x,y) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
563 #else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
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diff
changeset
|
564 #define stbi_lrot(x,y) (((x) << (y)) | ((x) >> (32 - (y)))) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
565 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
566 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
567 #if defined(STBI_MALLOC) && defined(STBI_FREE) && defined(STBI_REALLOC) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
568 // ok |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
569 #elif !defined(STBI_MALLOC) && !defined(STBI_FREE) && !defined(STBI_REALLOC) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
570 // ok |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
571 #else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
572 #error "Must define all or none of STBI_MALLOC, STBI_FREE, and STBI_REALLOC." |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
573 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
574 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
575 #ifndef STBI_MALLOC |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
576 #define STBI_MALLOC(sz) malloc(sz) |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
577 #define STBI_REALLOC(p,sz) realloc(p,sz) |
83a8881c782b
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Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
578 #define STBI_FREE(p) free(p) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
579 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
580 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
581 #if defined(__GNUC__) && !defined(__SSE2__) && !defined(STBI_NO_SIMD) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
582 // gcc doesn't support sse2 intrinsics unless you compile with -msse2, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
583 // (but compiling with -msse2 allows the compiler to use SSE2 everywhere; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
584 // this is just broken and gcc are jerks for not fixing it properly |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
585 // http://www.virtualdub.org/blog/pivot/entry.php?id=363 ) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
586 #define STBI_NO_SIMD |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
587 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
588 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
589 #if !defined(STBI_NO_SIMD) && (defined(__x86_64__) || defined(_M_X64) || defined(__i386) || defined(_M_IX86)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
590 #define STBI_SSE2 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
591 #include <emmintrin.h> |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
592 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
593 #ifdef _MSC_VER |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
594 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
595 #if _MSC_VER >= 1400 // not VC6 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
596 #include <intrin.h> // __cpuid |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
597 static int stbi__cpuid3(void) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
598 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
599 int info[4]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
600 __cpuid(info,1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
601 return info[3]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
602 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
603 #else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
604 static int stbi__cpuid3(void) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
605 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
606 int res; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
607 __asm { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
608 mov eax,1 |
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Import newer version of stb_image.
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diff
changeset
|
609 cpuid |
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Import newer version of stb_image.
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parents:
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diff
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|
610 mov res,edx |
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Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
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diff
changeset
|
611 } |
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Import newer version of stb_image.
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parents:
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diff
changeset
|
612 return res; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
613 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
614 #endif |
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Import newer version of stb_image.
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parents:
870
diff
changeset
|
615 |
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Import newer version of stb_image.
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parents:
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diff
changeset
|
616 #define STBI_SIMD_ALIGN(type, name) __declspec(align(16)) type name |
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Import newer version of stb_image.
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617 |
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diff
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|
618 static int stbi__sse2_available() |
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Import newer version of stb_image.
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diff
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|
619 { |
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Import newer version of stb_image.
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diff
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|
620 int info3 = stbi__cpuid3(); |
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Import newer version of stb_image.
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diff
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|
621 return ((info3 >> 26) & 1) != 0; |
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Import newer version of stb_image.
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diff
changeset
|
622 } |
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Import newer version of stb_image.
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diff
changeset
|
623 #else // assume GCC-style if not VC++ |
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Import newer version of stb_image.
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diff
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|
624 #define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16))) |
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diff
changeset
|
625 |
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parents:
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diff
changeset
|
626 static int stbi__sse2_available() |
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Import newer version of stb_image.
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diff
changeset
|
627 { |
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Import newer version of stb_image.
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parents:
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diff
changeset
|
628 #if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) >= 408 // GCC 4.8 or later |
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|
629 // GCC 4.8+ has a nice way to do this |
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Import newer version of stb_image.
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diff
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|
630 return __builtin_cpu_supports("sse2"); |
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Import newer version of stb_image.
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diff
changeset
|
631 #else |
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Import newer version of stb_image.
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parents:
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diff
changeset
|
632 // portable way to do this, preferably without using GCC inline ASM? |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
633 // just bail for now. |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
634 return 0; |
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Import newer version of stb_image.
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parents:
870
diff
changeset
|
635 #endif |
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Import newer version of stb_image.
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parents:
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diff
changeset
|
636 } |
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Import newer version of stb_image.
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parents:
870
diff
changeset
|
637 #endif |
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Import newer version of stb_image.
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parents:
870
diff
changeset
|
638 #endif |
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Import newer version of stb_image.
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parents:
870
diff
changeset
|
639 |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
640 // ARM NEON |
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Import newer version of stb_image.
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parents:
870
diff
changeset
|
641 #if defined(STBI_NO_SIMD) && defined(STBI_NEON) |
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Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
642 #undef STBI_NEON |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
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diff
changeset
|
643 #endif |
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Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
644 |
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Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
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diff
changeset
|
645 #ifdef STBI_NEON |
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Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
646 #include <arm_neon.h> |
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Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
647 // assume GCC or Clang on ARM targets |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
648 #define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16))) |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
649 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
650 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
651 #ifndef STBI_SIMD_ALIGN |
83a8881c782b
Import newer version of stb_image.
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parents:
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diff
changeset
|
652 #define STBI_SIMD_ALIGN(type, name) type name |
83a8881c782b
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Matti Hamalainen <ccr@tnsp.org>
parents:
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diff
changeset
|
653 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
654 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
655 /////////////////////////////////////////////// |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
656 // |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
657 // stbi__context struct and start_xxx functions |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
658 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
659 // stbi__context structure is our basic context used by all images, so it |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
660 // contains all the IO context, plus some basic image information |
83a8881c782b
Import newer version of stb_image.
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diff
changeset
|
661 typedef struct |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
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870
diff
changeset
|
662 { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
663 Uint32 img_x, img_y; |
893
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
664 int img_n, img_out_n; |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
665 |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
666 stbi_io_callbacks io; |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
667 void *io_user_data; |
83a8881c782b
Import newer version of stb_image.
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parents:
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diff
changeset
|
668 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
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diff
changeset
|
669 int read_from_callbacks; |
83a8881c782b
Import newer version of stb_image.
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diff
changeset
|
670 int buflen; |
899
63fd1801f983
Mangle new stb_image to our purposes.
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parents:
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diff
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|
671 Uint8 buffer_start[128]; |
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Mangle new stb_image to our purposes.
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parents:
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diff
changeset
|
672 |
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Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
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893
diff
changeset
|
673 Uint8 *img_buffer, *img_buffer_end; |
63fd1801f983
Mangle new stb_image to our purposes.
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parents:
893
diff
changeset
|
674 Uint8 *img_buffer_original; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
675 } stbi__context; |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
676 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
677 |
83a8881c782b
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parents:
870
diff
changeset
|
678 static void stbi__refill_buffer(stbi__context *s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
679 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
680 // initialize a memory-decode context |
899
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Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
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diff
changeset
|
681 static void stbi__start_mem(stbi__context *s, Uint8 const *buffer, int len) |
893
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
682 { |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
683 s->io.read = NULL; |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
684 s->read_from_callbacks = 0; |
899
63fd1801f983
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Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
685 s->img_buffer = s->img_buffer_original = (Uint8 *) buffer; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
686 s->img_buffer_end = (Uint8 *) buffer+len; |
893
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
687 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
688 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
689 // initialize a callback-based context |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
690 static void stbi__start_callbacks(stbi__context *s, stbi_io_callbacks *c, void *user) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
691 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
692 s->io = *c; |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
693 s->io_user_data = user; |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
694 s->buflen = sizeof(s->buffer_start); |
83a8881c782b
Import newer version of stb_image.
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870
diff
changeset
|
695 s->read_from_callbacks = 1; |
83a8881c782b
Import newer version of stb_image.
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diff
changeset
|
696 s->img_buffer_original = s->buffer_start; |
83a8881c782b
Import newer version of stb_image.
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870
diff
changeset
|
697 stbi__refill_buffer(s); |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
698 } |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
699 |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
700 #ifndef STBI_NO_STDIO |
83a8881c782b
Import newer version of stb_image.
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870
diff
changeset
|
701 |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
702 static int stbi__stdio_read(void *user, char *data, int size) |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
703 { |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
704 return (int) fread(data,1,size,(FILE*) user); |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
705 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
706 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
707 static void stbi__stdio_skip(void *user, int n) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
708 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
709 fseek((FILE*) user, n, SEEK_CUR); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
710 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
711 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
712 static int stbi__stdio_eof(void *user) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
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870
diff
changeset
|
713 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
714 return feof((FILE*) user); |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
715 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
716 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
717 static stbi_io_callbacks stbi__stdio_callbacks = |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
718 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
719 stbi__stdio_read, |
83a8881c782b
Import newer version of stb_image.
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parents:
870
diff
changeset
|
720 stbi__stdio_skip, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
721 stbi__stdio_eof, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
722 }; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
723 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
724 static void stbi__start_file(stbi__context *s, FILE *f) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
725 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
726 stbi__start_callbacks(s, &stbi__stdio_callbacks, (void *) f); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
727 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
728 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
729 //static void stop_file(stbi__context *s) { } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
730 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
731 #endif // !STBI_NO_STDIO |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
732 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
733 static void stbi__rewind(stbi__context *s) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
734 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
735 // conceptually rewind SHOULD rewind to the beginning of the stream, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
736 // but we just rewind to the beginning of the initial buffer, because |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
737 // we only use it after doing 'test', which only ever looks at at most 92 bytes |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
738 s->img_buffer = s->img_buffer_original; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
739 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
740 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
741 #ifndef STBI_NO_JPEG |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
742 static int stbi__jpeg_test(stbi__context *s); |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
743 static Uint8 *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
744 static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
745 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
746 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
747 #ifndef STBI_NO_PNG |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
748 static int stbi__png_test(stbi__context *s); |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
749 static Uint8 *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
750 static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
751 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
752 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
753 #ifndef STBI_NO_BMP |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
754 static int stbi__bmp_test(stbi__context *s); |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
755 static Uint8 *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
756 static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
757 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
758 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
759 #ifndef STBI_NO_TGA |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
760 static int stbi__tga_test(stbi__context *s); |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
761 static Uint8 *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
762 static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
763 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
764 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
765 #ifndef STBI_NO_PSD |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
766 static int stbi__psd_test(stbi__context *s); |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
767 static Uint8 *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
768 static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
769 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
770 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
771 #ifndef STBI_NO_HDR |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
772 static int stbi__hdr_test(stbi__context *s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
773 static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
774 static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
775 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
776 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
777 #ifndef STBI_NO_PIC |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
778 static int stbi__pic_test(stbi__context *s); |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
779 static Uint8 *stbi__pic_load(stbi__context *s, int *x, int *y, int *comp, int req_comp); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
780 static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
781 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
782 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
783 #ifndef STBI_NO_GIF |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
784 static int stbi__gif_test(stbi__context *s); |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
785 static Uint8 *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
786 static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
787 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
788 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
789 #ifndef STBI_NO_PNM |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
790 static int stbi__pnm_test(stbi__context *s); |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
791 static Uint8 *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
792 static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
793 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
794 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
795 // this is not threadsafe |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
796 static const char *stbi__g_failure_reason; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
797 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
798 STBIDEF const char *stbi_failure_reason(void) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
799 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
800 return stbi__g_failure_reason; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
801 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
802 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
803 #ifndef STBI_NO_FAILURE_STRINGS |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
804 static int stbi__err(const char *str) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
805 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
806 stbi__g_failure_reason = str; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
807 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
808 } |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
809 #endif |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
810 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
811 static void *stbi__malloc(size_t size) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
812 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
813 return STBI_MALLOC(size); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
814 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
815 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
816 // stbi__err - error |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
817 // stbi__errpf - error returning pointer to float |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
818 // stbi__errpuc - error returning pointer to unsigned char |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
819 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
820 #ifdef STBI_NO_FAILURE_STRINGS |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
821 #define stbi__err(x,y) 0 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
822 #elif defined(STBI_FAILURE_USERMSG) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
823 #define stbi__err(x,y) stbi__err(y) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
824 #else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
825 #define stbi__err(x,y) stbi__err(x) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
826 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
827 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
828 #define stbi__errpf(x,y) ((float *) (stbi__err(x,y)?NULL:NULL)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
829 #define stbi__errpuc(x,y) ((unsigned char *) (stbi__err(x,y)?NULL:NULL)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
830 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
831 STBIDEF void stbi_image_free(void *retval_from_stbi_load) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
832 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
833 STBI_FREE(retval_from_stbi_load); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
834 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
835 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
836 #ifndef STBI_NO_LINEAR |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
837 static float *stbi__ldr_to_hdr(Uint8 *data, int x, int y, int comp); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
838 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
839 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
840 #ifndef STBI_NO_HDR |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
841 static Uint8 *stbi__hdr_to_ldr(float *data, int x, int y, int comp); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
842 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
843 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
844 static unsigned char *stbi_load_main(stbi__context *s, int *x, int *y, int *comp, int req_comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
845 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
846 #ifndef STBI_NO_JPEG |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
847 if (stbi__jpeg_test(s)) return stbi__jpeg_load(s,x,y,comp,req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
848 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
849 #ifndef STBI_NO_PNG |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
850 if (stbi__png_test(s)) return stbi__png_load(s,x,y,comp,req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
851 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
852 #ifndef STBI_NO_BMP |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
853 if (stbi__bmp_test(s)) return stbi__bmp_load(s,x,y,comp,req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
854 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
855 #ifndef STBI_NO_GIF |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
856 if (stbi__gif_test(s)) return stbi__gif_load(s,x,y,comp,req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
857 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
858 #ifndef STBI_NO_PSD |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
859 if (stbi__psd_test(s)) return stbi__psd_load(s,x,y,comp,req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
860 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
861 #ifndef STBI_NO_PIC |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
862 if (stbi__pic_test(s)) return stbi__pic_load(s,x,y,comp,req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
863 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
864 #ifndef STBI_NO_PNM |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
865 if (stbi__pnm_test(s)) return stbi__pnm_load(s,x,y,comp,req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
866 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
867 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
868 #ifndef STBI_NO_HDR |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
869 if (stbi__hdr_test(s)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
870 float *hdr = stbi__hdr_load(s, x,y,comp,req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
871 return stbi__hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
872 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
873 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
874 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
875 #ifndef STBI_NO_TGA |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
876 // test tga last because it's a crappy test! |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
877 if (stbi__tga_test(s)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
878 return stbi__tga_load(s,x,y,comp,req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
879 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
880 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
881 return stbi__errpuc("unknown image type", "Image not of any known type, or corrupt"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
882 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
883 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
884 #ifndef STBI_NO_STDIO |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
885 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
886 static FILE *stbi__fopen(char const *filename, char const *mode) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
887 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
888 FILE *f; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
889 #if defined(_MSC_VER) && _MSC_VER >= 1400 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
890 if (0 != fopen_s(&f, filename, mode)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
891 f=0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
892 #else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
893 f = fopen(filename, mode); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
894 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
895 return f; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
896 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
897 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
898 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
899 STBIDEF Uint8 *stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
900 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
901 FILE *f = stbi__fopen(filename, "rb"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
902 unsigned char *result; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
903 if (!f) return stbi__errpuc("can't fopen", "Unable to open file"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
904 result = stbi_load_from_file(f,x,y,comp,req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
905 fclose(f); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
906 return result; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
907 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
908 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
909 STBIDEF Uint8 *stbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
910 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
911 unsigned char *result; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
912 stbi__context s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
913 stbi__start_file(&s,f); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
914 result = stbi_load_main(&s,x,y,comp,req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
915 if (result) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
916 // need to 'unget' all the characters in the IO buffer |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
917 fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
918 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
919 return result; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
920 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
921 #endif //!STBI_NO_STDIO |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
922 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
923 STBIDEF Uint8 *stbi_load_from_memory(Uint8 const *buffer, int len, int *x, int *y, int *comp, int req_comp) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
924 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
925 stbi__context s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
926 stbi__start_mem(&s,buffer,len); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
927 return stbi_load_main(&s,x,y,comp,req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
928 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
929 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
930 STBIDEF Uint8 *stbi_load_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
931 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
932 stbi__context s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
933 stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
934 return stbi_load_main(&s,x,y,comp,req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
935 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
936 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
937 #ifndef STBI_NO_LINEAR |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
938 static float *stbi_loadf_main(stbi__context *s, int *x, int *y, int *comp, int req_comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
939 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
940 unsigned char *data; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
941 #ifndef STBI_NO_HDR |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
942 if (stbi__hdr_test(s)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
943 return stbi__hdr_load(s,x,y,comp,req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
944 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
945 data = stbi_load_main(s, x, y, comp, req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
946 if (data) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
947 return stbi__ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
948 return stbi__errpf("unknown image type", "Image not of any known type, or corrupt"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
949 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
950 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
951 STBIDEF float *stbi_loadf_from_memory(Uint8 const *buffer, int len, int *x, int *y, int *comp, int req_comp) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
952 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
953 stbi__context s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
954 stbi__start_mem(&s,buffer,len); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
955 return stbi_loadf_main(&s,x,y,comp,req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
956 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
957 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
958 STBIDEF float *stbi_loadf_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
959 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
960 stbi__context s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
961 stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
962 return stbi_loadf_main(&s,x,y,comp,req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
963 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
964 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
965 #ifndef STBI_NO_STDIO |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
966 STBIDEF float *stbi_loadf(char const *filename, int *x, int *y, int *comp, int req_comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
967 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
968 float *result; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
969 FILE *f = stbi__fopen(filename, "rb"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
970 if (!f) return stbi__errpf("can't fopen", "Unable to open file"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
971 result = stbi_loadf_from_file(f,x,y,comp,req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
972 fclose(f); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
973 return result; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
974 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
975 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
976 STBIDEF float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
977 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
978 stbi__context s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
979 stbi__start_file(&s,f); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
980 return stbi_loadf_main(&s,x,y,comp,req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
981 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
982 #endif // !STBI_NO_STDIO |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
983 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
984 #endif // !STBI_NO_LINEAR |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
985 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
986 // these is-hdr-or-not is defined independent of whether STBI_NO_LINEAR is |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
987 // defined, for API simplicity; if STBI_NO_LINEAR is defined, it always |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
988 // reports false! |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
989 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
990 STBIDEF int stbi_is_hdr_from_memory(Uint8 const *buffer, int len) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
991 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
992 #ifndef STBI_NO_HDR |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
993 stbi__context s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
994 stbi__start_mem(&s,buffer,len); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
995 return stbi__hdr_test(&s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
996 #else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
997 STBI_NOTUSED(buffer); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
998 STBI_NOTUSED(len); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
999 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1000 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1001 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1002 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1003 #ifndef STBI_NO_STDIO |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1004 STBIDEF int stbi_is_hdr (char const *filename) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1005 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1006 FILE *f = stbi__fopen(filename, "rb"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1007 int result=0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1008 if (f) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1009 result = stbi_is_hdr_from_file(f); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1010 fclose(f); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1011 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1012 return result; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1013 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1014 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1015 STBIDEF int stbi_is_hdr_from_file(FILE *f) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1016 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1017 #ifndef STBI_NO_HDR |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1018 stbi__context s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1019 stbi__start_file(&s,f); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1020 return stbi__hdr_test(&s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1021 #else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1022 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1023 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1024 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1025 #endif // !STBI_NO_STDIO |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1026 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1027 STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1028 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1029 #ifndef STBI_NO_HDR |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1030 stbi__context s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1031 stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1032 return stbi__hdr_test(&s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1033 #else |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1034 (void) clbk; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1035 (void) user; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1036 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1037 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1038 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1039 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1040 static float stbi__h2l_gamma_i=1.0f/2.2f, stbi__h2l_scale_i=1.0f; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1041 static float stbi__l2h_gamma=2.2f, stbi__l2h_scale=1.0f; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1042 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1043 #ifndef STBI_NO_LINEAR |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1044 STBIDEF void stbi_ldr_to_hdr_gamma(float gamma) { stbi__l2h_gamma = gamma; } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1045 STBIDEF void stbi_ldr_to_hdr_scale(float scale) { stbi__l2h_scale = scale; } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1046 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1047 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1048 STBIDEF void stbi_hdr_to_ldr_gamma(float gamma) { stbi__h2l_gamma_i = 1/gamma; } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1049 STBIDEF void stbi_hdr_to_ldr_scale(float scale) { stbi__h2l_scale_i = 1/scale; } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1050 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1051 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1052 ////////////////////////////////////////////////////////////////////////////// |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1053 // |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1054 // Common code used by all image loaders |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1055 // |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1056 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1057 enum |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1058 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1059 STBI__SCAN_load=0, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1060 STBI__SCAN_type, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1061 STBI__SCAN_header |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1062 }; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1063 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1064 static void stbi__refill_buffer(stbi__context *s) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1065 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1066 int n = (s->io.read)(s->io_user_data,(char*)s->buffer_start,s->buflen); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1067 if (n == 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1068 // at end of file, treat same as if from memory, but need to handle case |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1069 // where s->img_buffer isn't pointing to safe memory, e.g. 0-byte file |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1070 s->read_from_callbacks = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1071 s->img_buffer = s->buffer_start; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1072 s->img_buffer_end = s->buffer_start+1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1073 *s->img_buffer = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1074 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1075 s->img_buffer = s->buffer_start; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1076 s->img_buffer_end = s->buffer_start + n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1077 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1078 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1079 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1080 stbi_inline static Uint8 stbi__get8(stbi__context *s) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1081 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1082 if (s->img_buffer < s->img_buffer_end) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1083 return *s->img_buffer++; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1084 if (s->read_from_callbacks) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1085 stbi__refill_buffer(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1086 return *s->img_buffer++; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1087 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1088 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1089 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1090 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1091 stbi_inline static int stbi__at_eof(stbi__context *s) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1092 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1093 if (s->io.read) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1094 if (!(s->io.eof)(s->io_user_data)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1095 // if feof() is true, check if buffer = end |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1096 // special case: we've only got the special 0 character at the end |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1097 if (s->read_from_callbacks == 0) return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1098 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1099 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1100 return s->img_buffer >= s->img_buffer_end; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1101 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1102 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1103 static void stbi__skip(stbi__context *s, int n) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1104 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1105 if (s->io.read) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1106 int blen = (int) (s->img_buffer_end - s->img_buffer); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1107 if (blen < n) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1108 s->img_buffer = s->img_buffer_end; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1109 (s->io.skip)(s->io_user_data, n - blen); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1110 return; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1111 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1112 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1113 s->img_buffer += n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1114 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1115 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1116 static int stbi__getn(stbi__context *s, Uint8 *buffer, int n) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1117 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1118 if (s->io.read) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1119 int blen = (int) (s->img_buffer_end - s->img_buffer); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1120 if (blen < n) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1121 int res, count; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1122 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1123 memcpy(buffer, s->img_buffer, blen); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1124 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1125 count = (s->io.read)(s->io_user_data, (char*) buffer + blen, n - blen); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1126 res = (count == (n-blen)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1127 s->img_buffer = s->img_buffer_end; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1128 return res; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1129 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1130 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1131 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1132 if (s->img_buffer+n <= s->img_buffer_end) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1133 memcpy(buffer, s->img_buffer, n); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1134 s->img_buffer += n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1135 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1136 } else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1137 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1138 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1139 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1140 static int stbi__get16be(stbi__context *s) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1141 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1142 int z = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1143 return (z << 8) + stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1144 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1145 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1146 static Uint32 stbi__get32be(stbi__context *s) |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1147 { |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1148 Uint32 z = stbi__get16be(s); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1149 return (z << 16) + stbi__get16be(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1150 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1151 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1152 static int stbi__get16le(stbi__context *s) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1153 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1154 int z = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1155 return z + (stbi__get8(s) << 8); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1156 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1157 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1158 static Uint32 stbi__get32le(stbi__context *s) |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1159 { |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1160 Uint32 z = stbi__get16le(s); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1161 return z + (stbi__get16le(s) << 16); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1162 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1163 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1164 #define STBI__BYTECAST(x) ((Uint8) ((x) & 255)) // truncate int to byte without warnings |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1165 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1166 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1167 ////////////////////////////////////////////////////////////////////////////// |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1168 // |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1169 // generic converter from built-in img_n to req_comp |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1170 // individual types do this automatically as much as possible (e.g. jpeg |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1171 // does all cases internally since it needs to colorspace convert anyway, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1172 // and it never has alpha, so very few cases ). png can automatically |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1173 // interleave an alpha=255 channel, but falls back to this for other cases |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1174 // |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1175 // assume data buffer is malloced, so malloc a new one and free that one |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1176 // only failure mode is malloc failing |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1177 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1178 static Uint8 stbi__compute_y(int r, int g, int b) |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1179 { |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1180 return (Uint8) (((r*77) + (g*150) + (29*b)) >> 8); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1181 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1182 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1183 static unsigned char *stbi__convert_format(unsigned char *data, int img_n, int req_comp, unsigned int x, unsigned int y) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1184 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1185 int i,j; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1186 unsigned char *good; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1187 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1188 if (req_comp == img_n) return data; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1189 STBI_ASSERT(req_comp >= 1 && req_comp <= 4); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1190 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1191 good = (unsigned char *) stbi__malloc(req_comp * x * y); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1192 if (good == NULL) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1193 STBI_FREE(data); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1194 return stbi__errpuc("outofmem", "Out of memory"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1195 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1196 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1197 for (j=0; j < (int) y; ++j) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1198 unsigned char *src = data + j * x * img_n ; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1199 unsigned char *dest = good + j * x * req_comp; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1200 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1201 #define COMBO(a,b) ((a)*8+(b)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1202 #define CASE(a,b) case COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1203 // convert source image with img_n components to one with req_comp components; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1204 // avoid switch per pixel, so use switch per scanline and massive macros |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1205 switch (COMBO(img_n, req_comp)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1206 CASE(1,2) dest[0]=src[0], dest[1]=255; break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1207 CASE(1,3) dest[0]=dest[1]=dest[2]=src[0]; break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1208 CASE(1,4) dest[0]=dest[1]=dest[2]=src[0], dest[3]=255; break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1209 CASE(2,1) dest[0]=src[0]; break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1210 CASE(2,3) dest[0]=dest[1]=dest[2]=src[0]; break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1211 CASE(2,4) dest[0]=dest[1]=dest[2]=src[0], dest[3]=src[1]; break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1212 CASE(3,4) dest[0]=src[0],dest[1]=src[1],dest[2]=src[2],dest[3]=255; break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1213 CASE(3,1) dest[0]=stbi__compute_y(src[0],src[1],src[2]); break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1214 CASE(3,2) dest[0]=stbi__compute_y(src[0],src[1],src[2]), dest[1] = 255; break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1215 CASE(4,1) dest[0]=stbi__compute_y(src[0],src[1],src[2]); break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1216 CASE(4,2) dest[0]=stbi__compute_y(src[0],src[1],src[2]), dest[1] = src[3]; break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1217 CASE(4,3) dest[0]=src[0],dest[1]=src[1],dest[2]=src[2]; break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1218 default: STBI_ASSERT(0); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1219 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1220 #undef CASE |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1221 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1222 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1223 STBI_FREE(data); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1224 return good; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1225 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1226 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1227 #ifndef STBI_NO_LINEAR |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1228 static float *stbi__ldr_to_hdr(Uint8 *data, int x, int y, int comp) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1229 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1230 int i,k,n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1231 float *output = (float *) stbi__malloc(x * y * comp * sizeof(float)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1232 if (output == NULL) { STBI_FREE(data); return stbi__errpf("outofmem", "Out of memory"); } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1233 // compute number of non-alpha components |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1234 if (comp & 1) n = comp; else n = comp-1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1235 for (i=0; i < x*y; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1236 for (k=0; k < n; ++k) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1237 output[i*comp + k] = (float) (pow(data[i*comp+k]/255.0f, stbi__l2h_gamma) * stbi__l2h_scale); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1238 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1239 if (k < comp) output[i*comp + k] = data[i*comp+k]/255.0f; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1240 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1241 STBI_FREE(data); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1242 return output; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1243 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1244 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1245 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1246 #ifndef STBI_NO_HDR |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1247 #define stbi__float2int(x) ((int) (x)) |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1248 static Uint8 *stbi__hdr_to_ldr(float *data, int x, int y, int comp) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1249 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1250 int i,k,n; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1251 Uint8 *output = (Uint8 *) stbi__malloc(x * y * comp); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1252 if (output == NULL) { STBI_FREE(data); return stbi__errpuc("outofmem", "Out of memory"); } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1253 // compute number of non-alpha components |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1254 if (comp & 1) n = comp; else n = comp-1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1255 for (i=0; i < x*y; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1256 for (k=0; k < n; ++k) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1257 float z = (float) pow(data[i*comp+k]*stbi__h2l_scale_i, stbi__h2l_gamma_i) * 255 + 0.5f; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1258 if (z < 0) z = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1259 if (z > 255) z = 255; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1260 output[i*comp + k] = (Uint8) stbi__float2int(z); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1261 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1262 if (k < comp) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1263 float z = data[i*comp+k] * 255 + 0.5f; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1264 if (z < 0) z = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1265 if (z > 255) z = 255; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1266 output[i*comp + k] = (Uint8) stbi__float2int(z); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1267 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1268 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1269 STBI_FREE(data); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1270 return output; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1271 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1272 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1273 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1274 ////////////////////////////////////////////////////////////////////////////// |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1275 // |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1276 // "baseline" JPEG/JFIF decoder |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1277 // |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1278 // simple implementation |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1279 // - doesn't support delayed output of y-dimension |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1280 // - simple interface (only one output format: 8-bit interleaved RGB) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1281 // - doesn't try to recover corrupt jpegs |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1282 // - doesn't allow partial loading, loading multiple at once |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1283 // - still fast on x86 (copying globals into locals doesn't help x86) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1284 // - allocates lots of intermediate memory (full size of all components) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1285 // - non-interleaved case requires this anyway |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1286 // - allows good upsampling (see next) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1287 // high-quality |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1288 // - upsampled channels are bilinearly interpolated, even across blocks |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1289 // - quality integer IDCT derived from IJG's 'slow' |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1290 // performance |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1291 // - fast huffman; reasonable integer IDCT |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1292 // - some SIMD kernels for common paths on targets with SSE2/NEON |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1293 // - uses a lot of intermediate memory, could cache poorly |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1294 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1295 #ifndef STBI_NO_JPEG |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1296 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1297 // huffman decoding acceleration |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1298 #define FAST_BITS 9 // larger handles more cases; smaller stomps less cache |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1299 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1300 typedef struct |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1301 { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1302 Uint8 fast[1 << FAST_BITS]; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1303 // weirdly, repacking this into AoS is a 10% speed loss, instead of a win |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1304 Uint16 code[256]; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1305 Uint8 values[256]; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1306 Uint8 size[257]; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1307 unsigned int maxcode[18]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1308 int delta[17]; // old 'firstsymbol' - old 'firstcode' |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1309 } stbi__huffman; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1310 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1311 typedef struct |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1312 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1313 stbi__context *s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1314 stbi__huffman huff_dc[4]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1315 stbi__huffman huff_ac[4]; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1316 Uint8 dequant[4][64]; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1317 Sint16 fast_ac[4][1 << FAST_BITS]; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1318 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1319 // sizes for components, interleaved MCUs |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1320 int img_h_max, img_v_max; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1321 int img_mcu_x, img_mcu_y; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1322 int img_mcu_w, img_mcu_h; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1323 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1324 // definition of jpeg image component |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1325 struct |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1326 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1327 int id; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1328 int h,v; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1329 int tq; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1330 int hd,ha; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1331 int dc_pred; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1332 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1333 int x,y,w2,h2; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1334 Uint8 *data; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1335 void *raw_data, *raw_coeff; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1336 Uint8 *linebuf; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1337 short *coeff; // progressive only |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1338 int coeff_w, coeff_h; // number of 8x8 coefficient blocks |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1339 } img_comp[4]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1340 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1341 Uint32 code_buffer; // jpeg entropy-coded buffer |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1342 int code_bits; // number of valid bits |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1343 unsigned char marker; // marker seen while filling entropy buffer |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1344 int nomore; // flag if we saw a marker so must stop |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1345 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1346 int progressive; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1347 int spec_start; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1348 int spec_end; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1349 int succ_high; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1350 int succ_low; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1351 int eob_run; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1352 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1353 int scan_n, order[4]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1354 int restart_interval, todo; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1355 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1356 // kernels |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1357 void (*idct_block_kernel)(Uint8 *out, int out_stride, short data[64]); |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1358 void (*YCbCr_to_RGB_kernel)(Uint8 *out, const Uint8 *y, const Uint8 *pcb, const Uint8 *pcr, int count, int step); |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1359 Uint8 *(*resample_row_hv_2_kernel)(Uint8 *out, Uint8 *in_near, Uint8 *in_far, int w, int hs); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1360 } stbi__jpeg; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1361 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1362 static int stbi__build_huffman(stbi__huffman *h, int *count) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1363 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1364 int i,j,k=0,code; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1365 // build size list for each symbol (from JPEG spec) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1366 for (i=0; i < 16; ++i) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1367 for (j=0; j < count[i]; ++j) |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1368 h->size[k++] = (Uint8) (i+1); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1369 h->size[k] = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1370 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1371 // compute actual symbols (from jpeg spec) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1372 code = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1373 k = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1374 for(j=1; j <= 16; ++j) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1375 // compute delta to add to code to compute symbol id |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1376 h->delta[j] = k - code; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1377 if (h->size[k] == j) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1378 while (h->size[k] == j) |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1379 h->code[k++] = (Uint16) (code++); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1380 if (code-1 >= (1 << j)) return stbi__err("bad code lengths","Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1381 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1382 // compute largest code + 1 for this size, preshifted as needed later |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1383 h->maxcode[j] = code << (16-j); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1384 code <<= 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1385 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1386 h->maxcode[j] = 0xffffffff; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1387 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1388 // build non-spec acceleration table; 255 is flag for not-accelerated |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1389 memset(h->fast, 255, 1 << FAST_BITS); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1390 for (i=0; i < k; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1391 int s = h->size[i]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1392 if (s <= FAST_BITS) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1393 int c = h->code[i] << (FAST_BITS-s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1394 int m = 1 << (FAST_BITS-s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1395 for (j=0; j < m; ++j) { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1396 h->fast[c+j] = (Uint8) i; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1397 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1398 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1399 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1400 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1401 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1402 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1403 // build a table that decodes both magnitude and value of small ACs in |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1404 // one go. |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1405 static void stbi__build_fast_ac(Sint16 *fast_ac, stbi__huffman *h) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1406 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1407 int i; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1408 for (i=0; i < (1 << FAST_BITS); ++i) { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1409 Uint8 fast = h->fast[i]; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1410 fast_ac[i] = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1411 if (fast < 255) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1412 int rs = h->values[fast]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1413 int run = (rs >> 4) & 15; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1414 int magbits = rs & 15; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1415 int len = h->size[fast]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1416 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1417 if (magbits && len + magbits <= FAST_BITS) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1418 // magnitude code followed by receive_extend code |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1419 int k = ((i << len) & ((1 << FAST_BITS) - 1)) >> (FAST_BITS - magbits); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1420 int m = 1 << (magbits - 1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1421 if (k < m) k += (-1 << magbits) + 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1422 // if the result is small enough, we can fit it in fast_ac table |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1423 if (k >= -128 && k <= 127) |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1424 fast_ac[i] = (Sint16) ((k << 8) + (run << 4) + (len + magbits)); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1425 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1426 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1427 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1428 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1429 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1430 static void stbi__grow_buffer_unsafe(stbi__jpeg *j) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1431 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1432 do { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1433 int b = j->nomore ? 0 : stbi__get8(j->s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1434 if (b == 0xff) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1435 int c = stbi__get8(j->s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1436 if (c != 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1437 j->marker = (unsigned char) c; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1438 j->nomore = 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1439 return; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1440 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1441 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1442 j->code_buffer |= b << (24 - j->code_bits); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1443 j->code_bits += 8; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1444 } while (j->code_bits <= 24); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1445 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1446 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1447 // (1 << n) - 1 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1448 static Uint32 stbi__bmask[17]={0,1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,65535}; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1449 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1450 // decode a jpeg huffman value from the bitstream |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1451 stbi_inline static int stbi__jpeg_huff_decode(stbi__jpeg *j, stbi__huffman *h) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1452 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1453 unsigned int temp; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1454 int c,k; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1455 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1456 if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1457 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1458 // look at the top FAST_BITS and determine what symbol ID it is, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1459 // if the code is <= FAST_BITS |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1460 c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1461 k = h->fast[c]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1462 if (k < 255) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1463 int s = h->size[k]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1464 if (s > j->code_bits) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1465 return -1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1466 j->code_buffer <<= s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1467 j->code_bits -= s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1468 return h->values[k]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1469 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1470 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1471 // naive test is to shift the code_buffer down so k bits are |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1472 // valid, then test against maxcode. To speed this up, we've |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1473 // preshifted maxcode left so that it has (16-k) 0s at the |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1474 // end; in other words, regardless of the number of bits, it |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1475 // wants to be compared against something shifted to have 16; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1476 // that way we don't need to shift inside the loop. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1477 temp = j->code_buffer >> 16; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1478 for (k=FAST_BITS+1 ; ; ++k) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1479 if (temp < h->maxcode[k]) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1480 break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1481 if (k == 17) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1482 // error! code not found |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1483 j->code_bits -= 16; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1484 return -1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1485 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1486 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1487 if (k > j->code_bits) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1488 return -1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1489 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1490 // convert the huffman code to the symbol id |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1491 c = ((j->code_buffer >> (32 - k)) & stbi__bmask[k]) + h->delta[k]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1492 STBI_ASSERT((((j->code_buffer) >> (32 - h->size[c])) & stbi__bmask[h->size[c]]) == h->code[c]); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1493 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1494 // convert the id to a symbol |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1495 j->code_bits -= k; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1496 j->code_buffer <<= k; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1497 return h->values[c]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1498 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1499 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1500 // bias[n] = (-1<<n) + 1 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1501 static int const stbi__jbias[16] = {0,-1,-3,-7,-15,-31,-63,-127,-255,-511,-1023,-2047,-4095,-8191,-16383,-32767}; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1502 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1503 // combined JPEG 'receive' and JPEG 'extend', since baseline |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1504 // always extends everything it receives. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1505 stbi_inline static int stbi__extend_receive(stbi__jpeg *j, int n) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1506 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1507 unsigned int k; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1508 int sgn; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1509 if (j->code_bits < n) stbi__grow_buffer_unsafe(j); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1510 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1511 sgn = (Sint32)j->code_buffer >> 31; // sign bit is always in MSB |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1512 k = stbi_lrot(j->code_buffer, n); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1513 j->code_buffer = k & ~stbi__bmask[n]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1514 k &= stbi__bmask[n]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1515 j->code_bits -= n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1516 return k + (stbi__jbias[n] & ~sgn); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1517 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1518 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1519 // get some unsigned bits |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1520 stbi_inline static int stbi__jpeg_get_bits(stbi__jpeg *j, int n) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1521 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1522 unsigned int k; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1523 if (j->code_bits < n) stbi__grow_buffer_unsafe(j); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1524 k = stbi_lrot(j->code_buffer, n); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1525 j->code_buffer = k & ~stbi__bmask[n]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1526 k &= stbi__bmask[n]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1527 j->code_bits -= n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1528 return k; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1529 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1530 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1531 stbi_inline static int stbi__jpeg_get_bit(stbi__jpeg *j) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1532 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1533 unsigned int k; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1534 if (j->code_bits < 1) stbi__grow_buffer_unsafe(j); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1535 k = j->code_buffer; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1536 j->code_buffer <<= 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1537 --j->code_bits; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1538 return k & 0x80000000; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1539 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1540 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1541 // given a value that's at position X in the zigzag stream, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1542 // where does it appear in the 8x8 matrix coded as row-major? |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1543 static Uint8 stbi__jpeg_dezigzag[64+15] = |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1544 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1545 0, 1, 8, 16, 9, 2, 3, 10, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1546 17, 24, 32, 25, 18, 11, 4, 5, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1547 12, 19, 26, 33, 40, 48, 41, 34, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1548 27, 20, 13, 6, 7, 14, 21, 28, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1549 35, 42, 49, 56, 57, 50, 43, 36, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1550 29, 22, 15, 23, 30, 37, 44, 51, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1551 58, 59, 52, 45, 38, 31, 39, 46, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1552 53, 60, 61, 54, 47, 55, 62, 63, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1553 // let corrupt input sample past end |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1554 63, 63, 63, 63, 63, 63, 63, 63, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1555 63, 63, 63, 63, 63, 63, 63 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1556 }; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1557 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1558 // decode one 64-entry block-- |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1559 static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman *hdc, stbi__huffman *hac, Sint16 *fac, int b, Uint8 *dequant) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1560 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1561 int diff,dc,k; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1562 int t; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1563 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1564 if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1565 t = stbi__jpeg_huff_decode(j, hdc); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1566 if (t < 0) return stbi__err("bad huffman code","Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1567 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1568 // 0 all the ac values now so we can do it 32-bits at a time |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1569 memset(data,0,64*sizeof(data[0])); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1570 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1571 diff = t ? stbi__extend_receive(j, t) : 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1572 dc = j->img_comp[b].dc_pred + diff; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1573 j->img_comp[b].dc_pred = dc; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1574 data[0] = (short) (dc * dequant[0]); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1575 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1576 // decode AC components, see JPEG spec |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1577 k = 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1578 do { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1579 unsigned int zig; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1580 int c,r,s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1581 if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1582 c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1583 r = fac[c]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1584 if (r) { // fast-AC path |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1585 k += (r >> 4) & 15; // run |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1586 s = r & 15; // combined length |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1587 j->code_buffer <<= s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1588 j->code_bits -= s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1589 // decode into unzigzag'd location |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1590 zig = stbi__jpeg_dezigzag[k++]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1591 data[zig] = (short) ((r >> 8) * dequant[zig]); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1592 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1593 int rs = stbi__jpeg_huff_decode(j, hac); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1594 if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1595 s = rs & 15; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1596 r = rs >> 4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1597 if (s == 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1598 if (rs != 0xf0) break; // end block |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1599 k += 16; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1600 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1601 k += r; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1602 // decode into unzigzag'd location |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1603 zig = stbi__jpeg_dezigzag[k++]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1604 data[zig] = (short) (stbi__extend_receive(j,s) * dequant[zig]); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1605 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1606 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1607 } while (k < 64); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1608 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1609 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1610 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1611 static int stbi__jpeg_decode_block_prog_dc(stbi__jpeg *j, short data[64], stbi__huffman *hdc, int b) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1612 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1613 int diff,dc; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1614 int t; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1615 if (j->spec_end != 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1616 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1617 if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1618 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1619 if (j->succ_high == 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1620 // first scan for DC coefficient, must be first |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1621 memset(data,0,64*sizeof(data[0])); // 0 all the ac values now |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1622 t = stbi__jpeg_huff_decode(j, hdc); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1623 diff = t ? stbi__extend_receive(j, t) : 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1624 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1625 dc = j->img_comp[b].dc_pred + diff; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1626 j->img_comp[b].dc_pred = dc; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1627 data[0] = (short) (dc << j->succ_low); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1628 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1629 // refinement scan for DC coefficient |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1630 if (stbi__jpeg_get_bit(j)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1631 data[0] += (short) (1 << j->succ_low); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1632 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1633 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1634 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1635 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1636 // @OPTIMIZE: store non-zigzagged during the decode passes, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1637 // and only de-zigzag when dequantizing |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1638 static int stbi__jpeg_decode_block_prog_ac(stbi__jpeg *j, short data[64], stbi__huffman *hac, Sint16 *fac) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1639 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1640 int k; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1641 if (j->spec_start == 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1642 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1643 if (j->succ_high == 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1644 int shift = j->succ_low; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1645 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1646 if (j->eob_run) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1647 --j->eob_run; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1648 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1649 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1650 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1651 k = j->spec_start; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1652 do { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1653 unsigned int zig; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1654 int c,r,s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1655 if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1656 c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1657 r = fac[c]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1658 if (r) { // fast-AC path |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1659 k += (r >> 4) & 15; // run |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1660 s = r & 15; // combined length |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1661 j->code_buffer <<= s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1662 j->code_bits -= s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1663 zig = stbi__jpeg_dezigzag[k++]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1664 data[zig] = (short) ((r >> 8) << shift); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1665 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1666 int rs = stbi__jpeg_huff_decode(j, hac); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1667 if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1668 s = rs & 15; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1669 r = rs >> 4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1670 if (s == 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1671 if (r < 15) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1672 j->eob_run = (1 << r); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1673 if (r) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1674 j->eob_run += stbi__jpeg_get_bits(j, r); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1675 --j->eob_run; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1676 break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1677 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1678 k += 16; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1679 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1680 k += r; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1681 zig = stbi__jpeg_dezigzag[k++]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1682 data[zig] = (short) (stbi__extend_receive(j,s) << shift); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1683 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1684 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1685 } while (k <= j->spec_end); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1686 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1687 // refinement scan for these AC coefficients |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1688 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1689 short bit = (short) (1 << j->succ_low); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1690 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1691 if (j->eob_run) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1692 --j->eob_run; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1693 for (k = j->spec_start; k <= j->spec_end; ++k) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1694 short *p = &data[stbi__jpeg_dezigzag[k]]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1695 if (*p != 0) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1696 if (stbi__jpeg_get_bit(j)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1697 if ((*p & bit)==0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1698 if (*p > 0) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1699 *p += bit; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1700 else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1701 *p -= bit; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1702 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1703 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1704 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1705 k = j->spec_start; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1706 do { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1707 int r,s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1708 int rs = stbi__jpeg_huff_decode(j, hac); // @OPTIMIZE see if we can use the fast path here, advance-by-r is so slow, eh |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1709 if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1710 s = rs & 15; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1711 r = rs >> 4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1712 if (s == 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1713 if (r < 15) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1714 j->eob_run = (1 << r) - 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1715 if (r) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1716 j->eob_run += stbi__jpeg_get_bits(j, r); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1717 r = 64; // force end of block |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1718 } else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1719 r = 16; // r=15 is the code for 16 0s |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1720 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1721 if (s != 1) return stbi__err("bad huffman code", "Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1722 // sign bit |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1723 if (stbi__jpeg_get_bit(j)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1724 s = bit; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1725 else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1726 s = -bit; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1727 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1728 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1729 // advance by r |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1730 while (k <= j->spec_end) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1731 short *p = &data[stbi__jpeg_dezigzag[k]]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1732 if (*p != 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1733 if (stbi__jpeg_get_bit(j)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1734 if ((*p & bit)==0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1735 if (*p > 0) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1736 *p += bit; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1737 else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1738 *p -= bit; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1739 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1740 ++k; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1741 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1742 if (r == 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1743 if (s) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1744 data[stbi__jpeg_dezigzag[k++]] = (short) s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1745 break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1746 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1747 --r; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1748 ++k; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1749 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1750 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1751 } while (k <= j->spec_end); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1752 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1753 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1754 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1755 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1756 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1757 // take a -128..127 value and stbi__clamp it and convert to 0..255 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1758 stbi_inline static Uint8 stbi__clamp(int x) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1759 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1760 // trick to use a single test to catch both cases |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1761 if ((unsigned int) x > 255) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1762 if (x < 0) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1763 if (x > 255) return 255; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1764 } |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1765 return (Uint8) x; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1766 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1767 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1768 #define stbi__f2f(x) ((int) (((x) * 4096 + 0.5))) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1769 #define stbi__fsh(x) ((x) << 12) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1770 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1771 // derived from jidctint -- DCT_ISLOW |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1772 #define STBI__IDCT_1D(s0,s1,s2,s3,s4,s5,s6,s7) \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1773 int t0,t1,t2,t3,p1,p2,p3,p4,p5,x0,x1,x2,x3; \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1774 p2 = s2; \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1775 p3 = s6; \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1776 p1 = (p2+p3) * stbi__f2f(0.5411961f); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1777 t2 = p1 + p3*stbi__f2f(-1.847759065f); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1778 t3 = p1 + p2*stbi__f2f( 0.765366865f); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1779 p2 = s0; \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1780 p3 = s4; \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1781 t0 = stbi__fsh(p2+p3); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1782 t1 = stbi__fsh(p2-p3); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1783 x0 = t0+t3; \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1784 x3 = t0-t3; \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1785 x1 = t1+t2; \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1786 x2 = t1-t2; \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1787 t0 = s7; \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1788 t1 = s5; \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1789 t2 = s3; \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1790 t3 = s1; \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1791 p3 = t0+t2; \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1792 p4 = t1+t3; \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1793 p1 = t0+t3; \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1794 p2 = t1+t2; \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1795 p5 = (p3+p4)*stbi__f2f( 1.175875602f); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1796 t0 = t0*stbi__f2f( 0.298631336f); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1797 t1 = t1*stbi__f2f( 2.053119869f); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1798 t2 = t2*stbi__f2f( 3.072711026f); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1799 t3 = t3*stbi__f2f( 1.501321110f); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1800 p1 = p5 + p1*stbi__f2f(-0.899976223f); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1801 p2 = p5 + p2*stbi__f2f(-2.562915447f); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1802 p3 = p3*stbi__f2f(-1.961570560f); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1803 p4 = p4*stbi__f2f(-0.390180644f); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1804 t3 += p1+p4; \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1805 t2 += p2+p3; \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1806 t1 += p2+p4; \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1807 t0 += p1+p3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1808 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1809 static void stbi__idct_block(Uint8 *out, int out_stride, short data[64]) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1810 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1811 int i,val[64],*v=val; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1812 Uint8 *o; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1813 short *d = data; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1814 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1815 // columns |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1816 for (i=0; i < 8; ++i,++d, ++v) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1817 // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1818 if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1819 && d[40]==0 && d[48]==0 && d[56]==0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1820 // no shortcut 0 seconds |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1821 // (1|2|3|4|5|6|7)==0 0 seconds |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1822 // all separate -0.047 seconds |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1823 // 1 && 2|3 && 4|5 && 6|7: -0.047 seconds |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1824 int dcterm = d[0] << 2; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1825 v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1826 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1827 STBI__IDCT_1D(d[ 0],d[ 8],d[16],d[24],d[32],d[40],d[48],d[56]) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1828 // constants scaled things up by 1<<12; let's bring them back |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1829 // down, but keep 2 extra bits of precision |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1830 x0 += 512; x1 += 512; x2 += 512; x3 += 512; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1831 v[ 0] = (x0+t3) >> 10; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1832 v[56] = (x0-t3) >> 10; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1833 v[ 8] = (x1+t2) >> 10; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1834 v[48] = (x1-t2) >> 10; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1835 v[16] = (x2+t1) >> 10; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1836 v[40] = (x2-t1) >> 10; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1837 v[24] = (x3+t0) >> 10; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1838 v[32] = (x3-t0) >> 10; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1839 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1840 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1841 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1842 for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1843 // no fast case since the first 1D IDCT spread components out |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1844 STBI__IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7]) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1845 // constants scaled things up by 1<<12, plus we had 1<<2 from first |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1846 // loop, plus horizontal and vertical each scale by sqrt(8) so together |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1847 // we've got an extra 1<<3, so 1<<17 total we need to remove. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1848 // so we want to round that, which means adding 0.5 * 1<<17, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1849 // aka 65536. Also, we'll end up with -128 to 127 that we want |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1850 // to encode as 0..255 by adding 128, so we'll add that before the shift |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1851 x0 += 65536 + (128<<17); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1852 x1 += 65536 + (128<<17); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1853 x2 += 65536 + (128<<17); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1854 x3 += 65536 + (128<<17); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1855 // tried computing the shifts into temps, or'ing the temps to see |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1856 // if any were out of range, but that was slower |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1857 o[0] = stbi__clamp((x0+t3) >> 17); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1858 o[7] = stbi__clamp((x0-t3) >> 17); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1859 o[1] = stbi__clamp((x1+t2) >> 17); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1860 o[6] = stbi__clamp((x1-t2) >> 17); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1861 o[2] = stbi__clamp((x2+t1) >> 17); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1862 o[5] = stbi__clamp((x2-t1) >> 17); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1863 o[3] = stbi__clamp((x3+t0) >> 17); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1864 o[4] = stbi__clamp((x3-t0) >> 17); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1865 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1866 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1867 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1868 #ifdef STBI_SSE2 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1869 // sse2 integer IDCT. not the fastest possible implementation but it |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1870 // produces bit-identical results to the generic C version so it's |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1871 // fully "transparent". |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
1872 static void stbi__idct_simd(Uint8 *out, int out_stride, short data[64]) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1873 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1874 // This is constructed to match our regular (generic) integer IDCT exactly. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1875 __m128i row0, row1, row2, row3, row4, row5, row6, row7; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1876 __m128i tmp; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1877 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1878 // dot product constant: even elems=x, odd elems=y |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1879 #define dct_const(x,y) _mm_setr_epi16((x),(y),(x),(y),(x),(y),(x),(y)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1880 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1881 // out(0) = c0[even]*x + c0[odd]*y (c0, x, y 16-bit, out 32-bit) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1882 // out(1) = c1[even]*x + c1[odd]*y |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1883 #define dct_rot(out0,out1, x,y,c0,c1) \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1884 __m128i c0##lo = _mm_unpacklo_epi16((x),(y)); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1885 __m128i c0##hi = _mm_unpackhi_epi16((x),(y)); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1886 __m128i out0##_l = _mm_madd_epi16(c0##lo, c0); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1887 __m128i out0##_h = _mm_madd_epi16(c0##hi, c0); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1888 __m128i out1##_l = _mm_madd_epi16(c0##lo, c1); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1889 __m128i out1##_h = _mm_madd_epi16(c0##hi, c1) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1890 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1891 // out = in << 12 (in 16-bit, out 32-bit) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1892 #define dct_widen(out, in) \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1893 __m128i out##_l = _mm_srai_epi32(_mm_unpacklo_epi16(_mm_setzero_si128(), (in)), 4); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1894 __m128i out##_h = _mm_srai_epi32(_mm_unpackhi_epi16(_mm_setzero_si128(), (in)), 4) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1895 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1896 // wide add |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1897 #define dct_wadd(out, a, b) \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1898 __m128i out##_l = _mm_add_epi32(a##_l, b##_l); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1899 __m128i out##_h = _mm_add_epi32(a##_h, b##_h) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1900 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1901 // wide sub |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1902 #define dct_wsub(out, a, b) \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1903 __m128i out##_l = _mm_sub_epi32(a##_l, b##_l); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1904 __m128i out##_h = _mm_sub_epi32(a##_h, b##_h) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1905 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1906 // butterfly a/b, add bias, then shift by "s" and pack |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1907 #define dct_bfly32o(out0, out1, a,b,bias,s) \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1908 { \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1909 __m128i abiased_l = _mm_add_epi32(a##_l, bias); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1910 __m128i abiased_h = _mm_add_epi32(a##_h, bias); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1911 dct_wadd(sum, abiased, b); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1912 dct_wsub(dif, abiased, b); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1913 out0 = _mm_packs_epi32(_mm_srai_epi32(sum_l, s), _mm_srai_epi32(sum_h, s)); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1914 out1 = _mm_packs_epi32(_mm_srai_epi32(dif_l, s), _mm_srai_epi32(dif_h, s)); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1915 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1916 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1917 // 8-bit interleave step (for transposes) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1918 #define dct_interleave8(a, b) \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1919 tmp = a; \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1920 a = _mm_unpacklo_epi8(a, b); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1921 b = _mm_unpackhi_epi8(tmp, b) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1922 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1923 // 16-bit interleave step (for transposes) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1924 #define dct_interleave16(a, b) \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1925 tmp = a; \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1926 a = _mm_unpacklo_epi16(a, b); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1927 b = _mm_unpackhi_epi16(tmp, b) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1928 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1929 #define dct_pass(bias,shift) \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1930 { \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1931 /* even part */ \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1932 dct_rot(t2e,t3e, row2,row6, rot0_0,rot0_1); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1933 __m128i sum04 = _mm_add_epi16(row0, row4); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1934 __m128i dif04 = _mm_sub_epi16(row0, row4); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1935 dct_widen(t0e, sum04); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1936 dct_widen(t1e, dif04); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1937 dct_wadd(x0, t0e, t3e); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1938 dct_wsub(x3, t0e, t3e); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1939 dct_wadd(x1, t1e, t2e); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1940 dct_wsub(x2, t1e, t2e); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1941 /* odd part */ \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1942 dct_rot(y0o,y2o, row7,row3, rot2_0,rot2_1); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1943 dct_rot(y1o,y3o, row5,row1, rot3_0,rot3_1); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1944 __m128i sum17 = _mm_add_epi16(row1, row7); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1945 __m128i sum35 = _mm_add_epi16(row3, row5); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1946 dct_rot(y4o,y5o, sum17,sum35, rot1_0,rot1_1); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1947 dct_wadd(x4, y0o, y4o); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1948 dct_wadd(x5, y1o, y5o); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1949 dct_wadd(x6, y2o, y5o); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1950 dct_wadd(x7, y3o, y4o); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1951 dct_bfly32o(row0,row7, x0,x7,bias,shift); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1952 dct_bfly32o(row1,row6, x1,x6,bias,shift); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1953 dct_bfly32o(row2,row5, x2,x5,bias,shift); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1954 dct_bfly32o(row3,row4, x3,x4,bias,shift); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1955 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1956 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1957 __m128i rot0_0 = dct_const(stbi__f2f(0.5411961f), stbi__f2f(0.5411961f) + stbi__f2f(-1.847759065f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1958 __m128i rot0_1 = dct_const(stbi__f2f(0.5411961f) + stbi__f2f( 0.765366865f), stbi__f2f(0.5411961f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1959 __m128i rot1_0 = dct_const(stbi__f2f(1.175875602f) + stbi__f2f(-0.899976223f), stbi__f2f(1.175875602f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1960 __m128i rot1_1 = dct_const(stbi__f2f(1.175875602f), stbi__f2f(1.175875602f) + stbi__f2f(-2.562915447f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1961 __m128i rot2_0 = dct_const(stbi__f2f(-1.961570560f) + stbi__f2f( 0.298631336f), stbi__f2f(-1.961570560f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1962 __m128i rot2_1 = dct_const(stbi__f2f(-1.961570560f), stbi__f2f(-1.961570560f) + stbi__f2f( 3.072711026f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1963 __m128i rot3_0 = dct_const(stbi__f2f(-0.390180644f) + stbi__f2f( 2.053119869f), stbi__f2f(-0.390180644f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1964 __m128i rot3_1 = dct_const(stbi__f2f(-0.390180644f), stbi__f2f(-0.390180644f) + stbi__f2f( 1.501321110f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1965 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1966 // rounding biases in column/row passes, see stbi__idct_block for explanation. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1967 __m128i bias_0 = _mm_set1_epi32(512); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1968 __m128i bias_1 = _mm_set1_epi32(65536 + (128<<17)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1969 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1970 // load |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1971 row0 = _mm_load_si128((const __m128i *) (data + 0*8)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1972 row1 = _mm_load_si128((const __m128i *) (data + 1*8)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1973 row2 = _mm_load_si128((const __m128i *) (data + 2*8)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1974 row3 = _mm_load_si128((const __m128i *) (data + 3*8)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1975 row4 = _mm_load_si128((const __m128i *) (data + 4*8)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1976 row5 = _mm_load_si128((const __m128i *) (data + 5*8)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1977 row6 = _mm_load_si128((const __m128i *) (data + 6*8)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1978 row7 = _mm_load_si128((const __m128i *) (data + 7*8)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1979 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1980 // column pass |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1981 dct_pass(bias_0, 10); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1982 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1983 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1984 // 16bit 8x8 transpose pass 1 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1985 dct_interleave16(row0, row4); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1986 dct_interleave16(row1, row5); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1987 dct_interleave16(row2, row6); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1988 dct_interleave16(row3, row7); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1989 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1990 // transpose pass 2 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1991 dct_interleave16(row0, row2); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1992 dct_interleave16(row1, row3); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1993 dct_interleave16(row4, row6); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1994 dct_interleave16(row5, row7); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1995 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1996 // transpose pass 3 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1997 dct_interleave16(row0, row1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1998 dct_interleave16(row2, row3); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
1999 dct_interleave16(row4, row5); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2000 dct_interleave16(row6, row7); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2001 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2002 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2003 // row pass |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2004 dct_pass(bias_1, 17); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2005 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2006 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2007 // pack |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2008 __m128i p0 = _mm_packus_epi16(row0, row1); // a0a1a2a3...a7b0b1b2b3...b7 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2009 __m128i p1 = _mm_packus_epi16(row2, row3); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2010 __m128i p2 = _mm_packus_epi16(row4, row5); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2011 __m128i p3 = _mm_packus_epi16(row6, row7); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2012 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2013 // 8bit 8x8 transpose pass 1 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2014 dct_interleave8(p0, p2); // a0e0a1e1... |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2015 dct_interleave8(p1, p3); // c0g0c1g1... |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2016 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2017 // transpose pass 2 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2018 dct_interleave8(p0, p1); // a0c0e0g0... |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2019 dct_interleave8(p2, p3); // b0d0f0h0... |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2020 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2021 // transpose pass 3 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2022 dct_interleave8(p0, p2); // a0b0c0d0... |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2023 dct_interleave8(p1, p3); // a4b4c4d4... |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2024 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2025 // store |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2026 _mm_storel_epi64((__m128i *) out, p0); out += out_stride; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2027 _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p0, 0x4e)); out += out_stride; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2028 _mm_storel_epi64((__m128i *) out, p2); out += out_stride; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2029 _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p2, 0x4e)); out += out_stride; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2030 _mm_storel_epi64((__m128i *) out, p1); out += out_stride; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2031 _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p1, 0x4e)); out += out_stride; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2032 _mm_storel_epi64((__m128i *) out, p3); out += out_stride; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2033 _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p3, 0x4e)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2034 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2035 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2036 #undef dct_const |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2037 #undef dct_rot |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2038 #undef dct_widen |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2039 #undef dct_wadd |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2040 #undef dct_wsub |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2041 #undef dct_bfly32o |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2042 #undef dct_interleave8 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2043 #undef dct_interleave16 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2044 #undef dct_pass |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2045 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2046 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2047 #endif // STBI_SSE2 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2048 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2049 #ifdef STBI_NEON |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2050 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2051 // NEON integer IDCT. should produce bit-identical |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2052 // results to the generic C version. |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2053 static void stbi__idct_simd(Uint8 *out, int out_stride, short data[64]) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2054 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2055 int16x8_t row0, row1, row2, row3, row4, row5, row6, row7; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2056 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2057 int16x4_t rot0_0 = vdup_n_s16(stbi__f2f(0.5411961f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2058 int16x4_t rot0_1 = vdup_n_s16(stbi__f2f(-1.847759065f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2059 int16x4_t rot0_2 = vdup_n_s16(stbi__f2f( 0.765366865f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2060 int16x4_t rot1_0 = vdup_n_s16(stbi__f2f( 1.175875602f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2061 int16x4_t rot1_1 = vdup_n_s16(stbi__f2f(-0.899976223f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2062 int16x4_t rot1_2 = vdup_n_s16(stbi__f2f(-2.562915447f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2063 int16x4_t rot2_0 = vdup_n_s16(stbi__f2f(-1.961570560f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2064 int16x4_t rot2_1 = vdup_n_s16(stbi__f2f(-0.390180644f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2065 int16x4_t rot3_0 = vdup_n_s16(stbi__f2f( 0.298631336f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2066 int16x4_t rot3_1 = vdup_n_s16(stbi__f2f( 2.053119869f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2067 int16x4_t rot3_2 = vdup_n_s16(stbi__f2f( 3.072711026f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2068 int16x4_t rot3_3 = vdup_n_s16(stbi__f2f( 1.501321110f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2069 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2070 #define dct_long_mul(out, inq, coeff) \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2071 int32x4_t out##_l = vmull_s16(vget_low_s16(inq), coeff); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2072 int32x4_t out##_h = vmull_s16(vget_high_s16(inq), coeff) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2073 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2074 #define dct_long_mac(out, acc, inq, coeff) \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2075 int32x4_t out##_l = vmlal_s16(acc##_l, vget_low_s16(inq), coeff); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2076 int32x4_t out##_h = vmlal_s16(acc##_h, vget_high_s16(inq), coeff) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2077 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2078 #define dct_widen(out, inq) \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2079 int32x4_t out##_l = vshll_n_s16(vget_low_s16(inq), 12); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2080 int32x4_t out##_h = vshll_n_s16(vget_high_s16(inq), 12) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2081 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2082 // wide add |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2083 #define dct_wadd(out, a, b) \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2084 int32x4_t out##_l = vaddq_s32(a##_l, b##_l); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2085 int32x4_t out##_h = vaddq_s32(a##_h, b##_h) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2086 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2087 // wide sub |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2088 #define dct_wsub(out, a, b) \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2089 int32x4_t out##_l = vsubq_s32(a##_l, b##_l); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2090 int32x4_t out##_h = vsubq_s32(a##_h, b##_h) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2091 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2092 // butterfly a/b, then shift using "shiftop" by "s" and pack |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2093 #define dct_bfly32o(out0,out1, a,b,shiftop,s) \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2094 { \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2095 dct_wadd(sum, a, b); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2096 dct_wsub(dif, a, b); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2097 out0 = vcombine_s16(shiftop(sum_l, s), shiftop(sum_h, s)); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2098 out1 = vcombine_s16(shiftop(dif_l, s), shiftop(dif_h, s)); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2099 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2100 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2101 #define dct_pass(shiftop, shift) \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2102 { \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2103 /* even part */ \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2104 int16x8_t sum26 = vaddq_s16(row2, row6); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2105 dct_long_mul(p1e, sum26, rot0_0); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2106 dct_long_mac(t2e, p1e, row6, rot0_1); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2107 dct_long_mac(t3e, p1e, row2, rot0_2); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2108 int16x8_t sum04 = vaddq_s16(row0, row4); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2109 int16x8_t dif04 = vsubq_s16(row0, row4); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2110 dct_widen(t0e, sum04); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2111 dct_widen(t1e, dif04); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2112 dct_wadd(x0, t0e, t3e); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2113 dct_wsub(x3, t0e, t3e); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2114 dct_wadd(x1, t1e, t2e); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2115 dct_wsub(x2, t1e, t2e); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2116 /* odd part */ \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2117 int16x8_t sum15 = vaddq_s16(row1, row5); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2118 int16x8_t sum17 = vaddq_s16(row1, row7); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2119 int16x8_t sum35 = vaddq_s16(row3, row5); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2120 int16x8_t sum37 = vaddq_s16(row3, row7); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2121 int16x8_t sumodd = vaddq_s16(sum17, sum35); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2122 dct_long_mul(p5o, sumodd, rot1_0); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2123 dct_long_mac(p1o, p5o, sum17, rot1_1); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2124 dct_long_mac(p2o, p5o, sum35, rot1_2); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2125 dct_long_mul(p3o, sum37, rot2_0); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2126 dct_long_mul(p4o, sum15, rot2_1); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2127 dct_wadd(sump13o, p1o, p3o); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2128 dct_wadd(sump24o, p2o, p4o); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2129 dct_wadd(sump23o, p2o, p3o); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2130 dct_wadd(sump14o, p1o, p4o); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2131 dct_long_mac(x4, sump13o, row7, rot3_0); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2132 dct_long_mac(x5, sump24o, row5, rot3_1); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2133 dct_long_mac(x6, sump23o, row3, rot3_2); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2134 dct_long_mac(x7, sump14o, row1, rot3_3); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2135 dct_bfly32o(row0,row7, x0,x7,shiftop,shift); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2136 dct_bfly32o(row1,row6, x1,x6,shiftop,shift); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2137 dct_bfly32o(row2,row5, x2,x5,shiftop,shift); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2138 dct_bfly32o(row3,row4, x3,x4,shiftop,shift); \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2139 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2140 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2141 // load |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2142 row0 = vld1q_s16(data + 0*8); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2143 row1 = vld1q_s16(data + 1*8); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2144 row2 = vld1q_s16(data + 2*8); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2145 row3 = vld1q_s16(data + 3*8); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2146 row4 = vld1q_s16(data + 4*8); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2147 row5 = vld1q_s16(data + 5*8); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2148 row6 = vld1q_s16(data + 6*8); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2149 row7 = vld1q_s16(data + 7*8); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2150 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2151 // add DC bias |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2152 row0 = vaddq_s16(row0, vsetq_lane_s16(1024, vdupq_n_s16(0), 0)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2153 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2154 // column pass |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2155 dct_pass(vrshrn_n_s32, 10); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2156 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2157 // 16bit 8x8 transpose |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2158 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2159 // these three map to a single VTRN.16, VTRN.32, and VSWP, respectively. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2160 // whether compilers actually get this is another story, sadly. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2161 #define dct_trn16(x, y) { int16x8x2_t t = vtrnq_s16(x, y); x = t.val[0]; y = t.val[1]; } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2162 #define dct_trn32(x, y) { int32x4x2_t t = vtrnq_s32(vreinterpretq_s32_s16(x), vreinterpretq_s32_s16(y)); x = vreinterpretq_s16_s32(t.val[0]); y = vreinterpretq_s16_s32(t.val[1]); } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2163 #define dct_trn64(x, y) { int16x8_t x0 = x; int16x8_t y0 = y; x = vcombine_s16(vget_low_s16(x0), vget_low_s16(y0)); y = vcombine_s16(vget_high_s16(x0), vget_high_s16(y0)); } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2164 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2165 // pass 1 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2166 dct_trn16(row0, row1); // a0b0a2b2a4b4a6b6 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2167 dct_trn16(row2, row3); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2168 dct_trn16(row4, row5); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2169 dct_trn16(row6, row7); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2170 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2171 // pass 2 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2172 dct_trn32(row0, row2); // a0b0c0d0a4b4c4d4 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2173 dct_trn32(row1, row3); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2174 dct_trn32(row4, row6); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2175 dct_trn32(row5, row7); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2176 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2177 // pass 3 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2178 dct_trn64(row0, row4); // a0b0c0d0e0f0g0h0 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2179 dct_trn64(row1, row5); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2180 dct_trn64(row2, row6); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2181 dct_trn64(row3, row7); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2182 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2183 #undef dct_trn16 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2184 #undef dct_trn32 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2185 #undef dct_trn64 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2186 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2187 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2188 // row pass |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2189 // vrshrn_n_s32 only supports shifts up to 16, we need |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2190 // 17. so do a non-rounding shift of 16 first then follow |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2191 // up with a rounding shift by 1. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2192 dct_pass(vshrn_n_s32, 16); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2193 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2194 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2195 // pack and round |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2196 uint8x8_t p0 = vqrshrun_n_s16(row0, 1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2197 uint8x8_t p1 = vqrshrun_n_s16(row1, 1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2198 uint8x8_t p2 = vqrshrun_n_s16(row2, 1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2199 uint8x8_t p3 = vqrshrun_n_s16(row3, 1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2200 uint8x8_t p4 = vqrshrun_n_s16(row4, 1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2201 uint8x8_t p5 = vqrshrun_n_s16(row5, 1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2202 uint8x8_t p6 = vqrshrun_n_s16(row6, 1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2203 uint8x8_t p7 = vqrshrun_n_s16(row7, 1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2204 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2205 // again, these can translate into one instruction, but often don't. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2206 #define dct_trn8_8(x, y) { uint8x8x2_t t = vtrn_u8(x, y); x = t.val[0]; y = t.val[1]; } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2207 #define dct_trn8_16(x, y) { uint16x4x2_t t = vtrn_u16(vreinterpret_u16_u8(x), vreinterpret_u16_u8(y)); x = vreinterpret_u8_u16(t.val[0]); y = vreinterpret_u8_u16(t.val[1]); } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2208 #define dct_trn8_32(x, y) { uint32x2x2_t t = vtrn_u32(vreinterpret_u32_u8(x), vreinterpret_u32_u8(y)); x = vreinterpret_u8_u32(t.val[0]); y = vreinterpret_u8_u32(t.val[1]); } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2209 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2210 // sadly can't use interleaved stores here since we only write |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2211 // 8 bytes to each scan line! |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2212 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2213 // 8x8 8-bit transpose pass 1 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2214 dct_trn8_8(p0, p1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2215 dct_trn8_8(p2, p3); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2216 dct_trn8_8(p4, p5); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2217 dct_trn8_8(p6, p7); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2218 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2219 // pass 2 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2220 dct_trn8_16(p0, p2); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2221 dct_trn8_16(p1, p3); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2222 dct_trn8_16(p4, p6); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2223 dct_trn8_16(p5, p7); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2224 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2225 // pass 3 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2226 dct_trn8_32(p0, p4); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2227 dct_trn8_32(p1, p5); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2228 dct_trn8_32(p2, p6); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2229 dct_trn8_32(p3, p7); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2230 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2231 // store |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2232 vst1_u8(out, p0); out += out_stride; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2233 vst1_u8(out, p1); out += out_stride; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2234 vst1_u8(out, p2); out += out_stride; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2235 vst1_u8(out, p3); out += out_stride; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2236 vst1_u8(out, p4); out += out_stride; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2237 vst1_u8(out, p5); out += out_stride; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2238 vst1_u8(out, p6); out += out_stride; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2239 vst1_u8(out, p7); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2240 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2241 #undef dct_trn8_8 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2242 #undef dct_trn8_16 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2243 #undef dct_trn8_32 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2244 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2245 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2246 #undef dct_long_mul |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2247 #undef dct_long_mac |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2248 #undef dct_widen |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2249 #undef dct_wadd |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2250 #undef dct_wsub |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2251 #undef dct_bfly32o |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2252 #undef dct_pass |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2253 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2254 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2255 #endif // STBI_NEON |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2256 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2257 #define STBI__MARKER_none 0xff |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2258 // if there's a pending marker from the entropy stream, return that |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2259 // otherwise, fetch from the stream and get a marker. if there's no |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2260 // marker, return 0xff, which is never a valid marker value |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2261 static Uint8 stbi__get_marker(stbi__jpeg *j) |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2262 { |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2263 Uint8 x; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2264 if (j->marker != STBI__MARKER_none) { x = j->marker; j->marker = STBI__MARKER_none; return x; } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2265 x = stbi__get8(j->s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2266 if (x != 0xff) return STBI__MARKER_none; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2267 while (x == 0xff) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2268 x = stbi__get8(j->s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2269 return x; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2270 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2271 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2272 // in each scan, we'll have scan_n components, and the order |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2273 // of the components is specified by order[] |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2274 #define STBI__RESTART(x) ((x) >= 0xd0 && (x) <= 0xd7) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2275 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2276 // after a restart interval, stbi__jpeg_reset the entropy decoder and |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2277 // the dc prediction |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2278 static void stbi__jpeg_reset(stbi__jpeg *j) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2279 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2280 j->code_bits = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2281 j->code_buffer = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2282 j->nomore = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2283 j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2284 j->marker = STBI__MARKER_none; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2285 j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2286 j->eob_run = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2287 // no more than 1<<31 MCUs if no restart_interal? that's plenty safe, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2288 // since we don't even allow 1<<30 pixels |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2289 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2290 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2291 static int stbi__parse_entropy_coded_data(stbi__jpeg *z) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2292 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2293 stbi__jpeg_reset(z); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2294 if (!z->progressive) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2295 if (z->scan_n == 1) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2296 int i,j; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2297 STBI_SIMD_ALIGN(short, data[64]); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2298 int n = z->order[0]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2299 // non-interleaved data, we just need to process one block at a time, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2300 // in trivial scanline order |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2301 // number of blocks to do just depends on how many actual "pixels" this |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2302 // component has, independent of interleaved MCU blocking and such |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2303 int w = (z->img_comp[n].x+7) >> 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2304 int h = (z->img_comp[n].y+7) >> 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2305 for (j=0; j < h; ++j) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2306 for (i=0; i < w; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2307 int ha = z->img_comp[n].ha; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2308 if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2309 z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2310 // every data block is an MCU, so countdown the restart interval |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2311 if (--z->todo <= 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2312 if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2313 // if it's NOT a restart, then just bail, so we get corrupt data |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2314 // rather than no data |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2315 if (!STBI__RESTART(z->marker)) return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2316 stbi__jpeg_reset(z); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2317 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2318 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2319 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2320 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2321 } else { // interleaved |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2322 int i,j,k,x,y; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2323 STBI_SIMD_ALIGN(short, data[64]); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2324 for (j=0; j < z->img_mcu_y; ++j) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2325 for (i=0; i < z->img_mcu_x; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2326 // scan an interleaved mcu... process scan_n components in order |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2327 for (k=0; k < z->scan_n; ++k) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2328 int n = z->order[k]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2329 // scan out an mcu's worth of this component; that's just determined |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2330 // by the basic H and V specified for the component |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2331 for (y=0; y < z->img_comp[n].v; ++y) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2332 for (x=0; x < z->img_comp[n].h; ++x) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2333 int x2 = (i*z->img_comp[n].h + x)*8; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2334 int y2 = (j*z->img_comp[n].v + y)*8; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2335 int ha = z->img_comp[n].ha; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2336 if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2337 z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2338 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2339 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2340 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2341 // after all interleaved components, that's an interleaved MCU, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2342 // so now count down the restart interval |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2343 if (--z->todo <= 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2344 if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2345 if (!STBI__RESTART(z->marker)) return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2346 stbi__jpeg_reset(z); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2347 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2348 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2349 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2350 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2351 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2352 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2353 if (z->scan_n == 1) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2354 int i,j; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2355 int n = z->order[0]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2356 // non-interleaved data, we just need to process one block at a time, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2357 // in trivial scanline order |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2358 // number of blocks to do just depends on how many actual "pixels" this |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2359 // component has, independent of interleaved MCU blocking and such |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2360 int w = (z->img_comp[n].x+7) >> 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2361 int h = (z->img_comp[n].y+7) >> 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2362 for (j=0; j < h; ++j) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2363 for (i=0; i < w; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2364 short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2365 if (z->spec_start == 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2366 if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2367 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2368 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2369 int ha = z->img_comp[n].ha; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2370 if (!stbi__jpeg_decode_block_prog_ac(z, data, &z->huff_ac[ha], z->fast_ac[ha])) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2371 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2372 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2373 // every data block is an MCU, so countdown the restart interval |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2374 if (--z->todo <= 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2375 if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2376 if (!STBI__RESTART(z->marker)) return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2377 stbi__jpeg_reset(z); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2378 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2379 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2380 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2381 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2382 } else { // interleaved |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2383 int i,j,k,x,y; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2384 for (j=0; j < z->img_mcu_y; ++j) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2385 for (i=0; i < z->img_mcu_x; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2386 // scan an interleaved mcu... process scan_n components in order |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2387 for (k=0; k < z->scan_n; ++k) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2388 int n = z->order[k]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2389 // scan out an mcu's worth of this component; that's just determined |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2390 // by the basic H and V specified for the component |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2391 for (y=0; y < z->img_comp[n].v; ++y) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2392 for (x=0; x < z->img_comp[n].h; ++x) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2393 int x2 = (i*z->img_comp[n].h + x); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2394 int y2 = (j*z->img_comp[n].v + y); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2395 short *data = z->img_comp[n].coeff + 64 * (x2 + y2 * z->img_comp[n].coeff_w); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2396 if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2397 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2398 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2399 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2400 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2401 // after all interleaved components, that's an interleaved MCU, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2402 // so now count down the restart interval |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2403 if (--z->todo <= 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2404 if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2405 if (!STBI__RESTART(z->marker)) return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2406 stbi__jpeg_reset(z); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2407 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2408 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2409 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2410 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2411 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2412 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2413 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2414 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2415 static void stbi__jpeg_dequantize(short *data, Uint8 *dequant) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2416 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2417 int i; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2418 for (i=0; i < 64; ++i) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2419 data[i] *= dequant[i]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2420 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2421 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2422 static void stbi__jpeg_finish(stbi__jpeg *z) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2423 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2424 if (z->progressive) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2425 // dequantize and idct the data |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2426 int i,j,n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2427 for (n=0; n < z->s->img_n; ++n) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2428 int w = (z->img_comp[n].x+7) >> 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2429 int h = (z->img_comp[n].y+7) >> 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2430 for (j=0; j < h; ++j) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2431 for (i=0; i < w; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2432 short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2433 stbi__jpeg_dequantize(data, z->dequant[z->img_comp[n].tq]); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2434 z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2435 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2436 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2437 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2438 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2439 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2440 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2441 static int stbi__process_marker(stbi__jpeg *z, int m) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2442 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2443 int L; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2444 switch (m) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2445 case STBI__MARKER_none: // no marker found |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2446 return stbi__err("expected marker","Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2447 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2448 case 0xDD: // DRI - specify restart interval |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2449 if (stbi__get16be(z->s) != 4) return stbi__err("bad DRI len","Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2450 z->restart_interval = stbi__get16be(z->s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2451 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2452 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2453 case 0xDB: // DQT - define quantization table |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2454 L = stbi__get16be(z->s)-2; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2455 while (L > 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2456 int q = stbi__get8(z->s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2457 int p = q >> 4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2458 int t = q & 15,i; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2459 if (p != 0) return stbi__err("bad DQT type","Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2460 if (t > 3) return stbi__err("bad DQT table","Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2461 for (i=0; i < 64; ++i) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2462 z->dequant[t][stbi__jpeg_dezigzag[i]] = stbi__get8(z->s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2463 L -= 65; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2464 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2465 return L==0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2466 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2467 case 0xC4: // DHT - define huffman table |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2468 L = stbi__get16be(z->s)-2; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2469 while (L > 0) { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2470 Uint8 *v; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2471 int sizes[16],i,n=0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2472 int q = stbi__get8(z->s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2473 int tc = q >> 4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2474 int th = q & 15; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2475 if (tc > 1 || th > 3) return stbi__err("bad DHT header","Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2476 for (i=0; i < 16; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2477 sizes[i] = stbi__get8(z->s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2478 n += sizes[i]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2479 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2480 L -= 17; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2481 if (tc == 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2482 if (!stbi__build_huffman(z->huff_dc+th, sizes)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2483 v = z->huff_dc[th].values; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2484 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2485 if (!stbi__build_huffman(z->huff_ac+th, sizes)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2486 v = z->huff_ac[th].values; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2487 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2488 for (i=0; i < n; ++i) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2489 v[i] = stbi__get8(z->s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2490 if (tc != 0) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2491 stbi__build_fast_ac(z->fast_ac[th], z->huff_ac + th); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2492 L -= n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2493 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2494 return L==0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2495 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2496 // check for comment block or APP blocks |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2497 if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2498 stbi__skip(z->s, stbi__get16be(z->s)-2); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2499 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2500 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2501 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2502 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2503 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2504 // after we see SOS |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2505 static int stbi__process_scan_header(stbi__jpeg *z) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2506 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2507 int i; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2508 int Ls = stbi__get16be(z->s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2509 z->scan_n = stbi__get8(z->s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2510 if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int) z->s->img_n) return stbi__err("bad SOS component count","Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2511 if (Ls != 6+2*z->scan_n) return stbi__err("bad SOS len","Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2512 for (i=0; i < z->scan_n; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2513 int id = stbi__get8(z->s), which; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2514 int q = stbi__get8(z->s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2515 for (which = 0; which < z->s->img_n; ++which) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2516 if (z->img_comp[which].id == id) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2517 break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2518 if (which == z->s->img_n) return 0; // no match |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2519 z->img_comp[which].hd = q >> 4; if (z->img_comp[which].hd > 3) return stbi__err("bad DC huff","Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2520 z->img_comp[which].ha = q & 15; if (z->img_comp[which].ha > 3) return stbi__err("bad AC huff","Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2521 z->order[i] = which; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2522 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2523 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2524 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2525 int aa; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2526 z->spec_start = stbi__get8(z->s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2527 z->spec_end = stbi__get8(z->s); // should be 63, but might be 0 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2528 aa = stbi__get8(z->s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2529 z->succ_high = (aa >> 4); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2530 z->succ_low = (aa & 15); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2531 if (z->progressive) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2532 if (z->spec_start > 63 || z->spec_end > 63 || z->spec_start > z->spec_end || z->succ_high > 13 || z->succ_low > 13) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2533 return stbi__err("bad SOS", "Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2534 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2535 if (z->spec_start != 0) return stbi__err("bad SOS","Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2536 if (z->succ_high != 0 || z->succ_low != 0) return stbi__err("bad SOS","Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2537 z->spec_end = 63; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2538 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2539 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2540 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2541 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2542 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2543 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2544 static int stbi__process_frame_header(stbi__jpeg *z, int scan) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2545 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2546 stbi__context *s = z->s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2547 int Lf,p,i,q, h_max=1,v_max=1,c; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2548 Lf = stbi__get16be(s); if (Lf < 11) return stbi__err("bad SOF len","Corrupt JPEG"); // JPEG |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2549 p = stbi__get8(s); if (p != 8) return stbi__err("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2550 s->img_y = stbi__get16be(s); if (s->img_y == 0) return stbi__err("no header height", "JPEG format not supported: delayed height"); // Legal, but we don't handle it--but neither does IJG |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2551 s->img_x = stbi__get16be(s); if (s->img_x == 0) return stbi__err("0 width","Corrupt JPEG"); // JPEG requires |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2552 c = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2553 if (c != 3 && c != 1) return stbi__err("bad component count","Corrupt JPEG"); // JFIF requires |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2554 s->img_n = c; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2555 for (i=0; i < c; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2556 z->img_comp[i].data = NULL; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2557 z->img_comp[i].linebuf = NULL; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2558 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2559 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2560 if (Lf != 8+3*s->img_n) return stbi__err("bad SOF len","Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2561 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2562 for (i=0; i < s->img_n; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2563 z->img_comp[i].id = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2564 if (z->img_comp[i].id != i+1) // JFIF requires |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2565 if (z->img_comp[i].id != i) // some version of jpegtran outputs non-JFIF-compliant files! |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2566 return stbi__err("bad component ID","Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2567 q = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2568 z->img_comp[i].h = (q >> 4); if (!z->img_comp[i].h || z->img_comp[i].h > 4) return stbi__err("bad H","Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2569 z->img_comp[i].v = q & 15; if (!z->img_comp[i].v || z->img_comp[i].v > 4) return stbi__err("bad V","Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2570 z->img_comp[i].tq = stbi__get8(s); if (z->img_comp[i].tq > 3) return stbi__err("bad TQ","Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2571 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2572 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2573 if (scan != STBI__SCAN_load) return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2574 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2575 if ((1 << 30) / s->img_x / s->img_n < s->img_y) return stbi__err("too large", "Image too large to decode"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2576 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2577 for (i=0; i < s->img_n; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2578 if (z->img_comp[i].h > h_max) h_max = z->img_comp[i].h; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2579 if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2580 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2581 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2582 // compute interleaved mcu info |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2583 z->img_h_max = h_max; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2584 z->img_v_max = v_max; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2585 z->img_mcu_w = h_max * 8; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2586 z->img_mcu_h = v_max * 8; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2587 z->img_mcu_x = (s->img_x + z->img_mcu_w-1) / z->img_mcu_w; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2588 z->img_mcu_y = (s->img_y + z->img_mcu_h-1) / z->img_mcu_h; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2589 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2590 for (i=0; i < s->img_n; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2591 // number of effective pixels (e.g. for non-interleaved MCU) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2592 z->img_comp[i].x = (s->img_x * z->img_comp[i].h + h_max-1) / h_max; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2593 z->img_comp[i].y = (s->img_y * z->img_comp[i].v + v_max-1) / v_max; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2594 // to simplify generation, we'll allocate enough memory to decode |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2595 // the bogus oversized data from using interleaved MCUs and their |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2596 // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2597 // discard the extra data until colorspace conversion |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2598 z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2599 z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2600 z->img_comp[i].raw_data = stbi__malloc(z->img_comp[i].w2 * z->img_comp[i].h2+15); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2601 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2602 if (z->img_comp[i].raw_data == NULL) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2603 for(--i; i >= 0; --i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2604 STBI_FREE(z->img_comp[i].raw_data); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2605 z->img_comp[i].data = NULL; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2606 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2607 return stbi__err("outofmem", "Out of memory"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2608 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2609 // align blocks for idct using mmx/sse |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2610 z->img_comp[i].data = (Uint8*) (((size_t) z->img_comp[i].raw_data + 15) & ~15); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2611 z->img_comp[i].linebuf = NULL; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2612 if (z->progressive) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2613 z->img_comp[i].coeff_w = (z->img_comp[i].w2 + 7) >> 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2614 z->img_comp[i].coeff_h = (z->img_comp[i].h2 + 7) >> 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2615 z->img_comp[i].raw_coeff = STBI_MALLOC(z->img_comp[i].coeff_w * z->img_comp[i].coeff_h * 64 * sizeof(short) + 15); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2616 z->img_comp[i].coeff = (short*) (((size_t) z->img_comp[i].raw_coeff + 15) & ~15); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2617 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2618 z->img_comp[i].coeff = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2619 z->img_comp[i].raw_coeff = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2620 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2621 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2622 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2623 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2624 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2625 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2626 // use comparisons since in some cases we handle more than one case (e.g. SOF) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2627 #define stbi__DNL(x) ((x) == 0xdc) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2628 #define stbi__SOI(x) ((x) == 0xd8) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2629 #define stbi__EOI(x) ((x) == 0xd9) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2630 #define stbi__SOF(x) ((x) == 0xc0 || (x) == 0xc1 || (x) == 0xc2) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2631 #define stbi__SOS(x) ((x) == 0xda) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2632 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2633 #define stbi__SOF_progressive(x) ((x) == 0xc2) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2634 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2635 static int stbi__decode_jpeg_header(stbi__jpeg *z, int scan) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2636 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2637 int m; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2638 z->marker = STBI__MARKER_none; // initialize cached marker to empty |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2639 m = stbi__get_marker(z); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2640 if (!stbi__SOI(m)) return stbi__err("no SOI","Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2641 if (scan == STBI__SCAN_type) return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2642 m = stbi__get_marker(z); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2643 while (!stbi__SOF(m)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2644 if (!stbi__process_marker(z,m)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2645 m = stbi__get_marker(z); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2646 while (m == STBI__MARKER_none) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2647 // some files have extra padding after their blocks, so ok, we'll scan |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2648 if (stbi__at_eof(z->s)) return stbi__err("no SOF", "Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2649 m = stbi__get_marker(z); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2650 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2651 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2652 z->progressive = stbi__SOF_progressive(m); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2653 if (!stbi__process_frame_header(z, scan)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2654 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2655 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2656 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2657 // decode image to YCbCr format |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2658 static int stbi__decode_jpeg_image(stbi__jpeg *j) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2659 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2660 int m; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2661 j->restart_interval = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2662 if (!stbi__decode_jpeg_header(j, STBI__SCAN_load)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2663 m = stbi__get_marker(j); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2664 while (!stbi__EOI(m)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2665 if (stbi__SOS(m)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2666 if (!stbi__process_scan_header(j)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2667 if (!stbi__parse_entropy_coded_data(j)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2668 if (j->marker == STBI__MARKER_none ) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2669 // handle 0s at the end of image data from IP Kamera 9060 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2670 while (!stbi__at_eof(j->s)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2671 int x = stbi__get8(j->s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2672 if (x == 255) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2673 j->marker = stbi__get8(j->s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2674 break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2675 } else if (x != 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2676 return stbi__err("junk before marker", "Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2677 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2678 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2679 // if we reach eof without hitting a marker, stbi__get_marker() below will fail and we'll eventually return 0 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2680 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2681 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2682 if (!stbi__process_marker(j, m)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2683 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2684 m = stbi__get_marker(j); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2685 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2686 if (j->progressive) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2687 stbi__jpeg_finish(j); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2688 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2689 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2690 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2691 // static jfif-centered resampling (across block boundaries) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2692 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2693 typedef Uint8 *(*resample_row_func)(Uint8 *out, Uint8 *in0, Uint8 *in1, |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2694 int w, int hs); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2695 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2696 #define stbi__div4(x) ((Uint8) ((x) >> 2)) |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2697 |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2698 static Uint8 *resample_row_1(Uint8 *out, Uint8 *in_near, Uint8 *in_far, int w, int hs) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2699 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2700 STBI_NOTUSED(out); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2701 STBI_NOTUSED(in_far); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2702 STBI_NOTUSED(w); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2703 STBI_NOTUSED(hs); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2704 return in_near; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2705 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2706 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2707 static Uint8* stbi__resample_row_v_2(Uint8 *out, Uint8 *in_near, Uint8 *in_far, int w, int hs) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2708 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2709 // need to generate two samples vertically for every one in input |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2710 int i; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2711 STBI_NOTUSED(hs); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2712 for (i=0; i < w; ++i) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2713 out[i] = stbi__div4(3*in_near[i] + in_far[i] + 2); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2714 return out; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2715 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2716 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2717 static Uint8* stbi__resample_row_h_2(Uint8 *out, Uint8 *in_near, Uint8 *in_far, int w, int hs) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2718 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2719 // need to generate two samples horizontally for every one in input |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2720 int i; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2721 Uint8 *input = in_near; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2722 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2723 if (w == 1) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2724 // if only one sample, can't do any interpolation |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2725 out[0] = out[1] = input[0]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2726 return out; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2727 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2728 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2729 out[0] = input[0]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2730 out[1] = stbi__div4(input[0]*3 + input[1] + 2); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2731 for (i=1; i < w-1; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2732 int n = 3*input[i]+2; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2733 out[i*2+0] = stbi__div4(n+input[i-1]); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2734 out[i*2+1] = stbi__div4(n+input[i+1]); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2735 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2736 out[i*2+0] = stbi__div4(input[w-2]*3 + input[w-1] + 2); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2737 out[i*2+1] = input[w-1]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2738 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2739 STBI_NOTUSED(in_far); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2740 STBI_NOTUSED(hs); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2741 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2742 return out; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2743 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2744 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2745 #define stbi__div16(x) ((Uint8) ((x) >> 4)) |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2746 |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2747 static Uint8 *stbi__resample_row_hv_2(Uint8 *out, Uint8 *in_near, Uint8 *in_far, int w, int hs) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2748 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2749 // need to generate 2x2 samples for every one in input |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2750 int i,t0,t1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2751 if (w == 1) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2752 out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2753 return out; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2754 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2755 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2756 t1 = 3*in_near[0] + in_far[0]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2757 out[0] = stbi__div4(t1+2); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2758 for (i=1; i < w; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2759 t0 = t1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2760 t1 = 3*in_near[i]+in_far[i]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2761 out[i*2-1] = stbi__div16(3*t0 + t1 + 8); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2762 out[i*2 ] = stbi__div16(3*t1 + t0 + 8); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2763 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2764 out[w*2-1] = stbi__div4(t1+2); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2765 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2766 STBI_NOTUSED(hs); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2767 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2768 return out; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2769 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2770 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2771 #if defined(STBI_SSE2) || defined(STBI_NEON) |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2772 static Uint8 *stbi__resample_row_hv_2_simd(Uint8 *out, Uint8 *in_near, Uint8 *in_far, int w, int hs) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2773 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2774 // need to generate 2x2 samples for every one in input |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2775 int i=0,t0,t1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2776 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2777 if (w == 1) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2778 out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2779 return out; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2780 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2781 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2782 t1 = 3*in_near[0] + in_far[0]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2783 // process groups of 8 pixels for as long as we can. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2784 // note we can't handle the last pixel in a row in this loop |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2785 // because we need to handle the filter boundary conditions. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2786 for (; i < ((w-1) & ~7); i += 8) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2787 #if defined(STBI_SSE2) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2788 // load and perform the vertical filtering pass |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2789 // this uses 3*x + y = 4*x + (y - x) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2790 __m128i zero = _mm_setzero_si128(); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2791 __m128i farb = _mm_loadl_epi64((__m128i *) (in_far + i)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2792 __m128i nearb = _mm_loadl_epi64((__m128i *) (in_near + i)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2793 __m128i farw = _mm_unpacklo_epi8(farb, zero); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2794 __m128i nearw = _mm_unpacklo_epi8(nearb, zero); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2795 __m128i diff = _mm_sub_epi16(farw, nearw); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2796 __m128i nears = _mm_slli_epi16(nearw, 2); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2797 __m128i curr = _mm_add_epi16(nears, diff); // current row |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2798 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2799 // horizontal filter works the same based on shifted vers of current |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2800 // row. "prev" is current row shifted right by 1 pixel; we need to |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2801 // insert the previous pixel value (from t1). |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2802 // "next" is current row shifted left by 1 pixel, with first pixel |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2803 // of next block of 8 pixels added in. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2804 __m128i prv0 = _mm_slli_si128(curr, 2); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2805 __m128i nxt0 = _mm_srli_si128(curr, 2); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2806 __m128i prev = _mm_insert_epi16(prv0, t1, 0); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2807 __m128i next = _mm_insert_epi16(nxt0, 3*in_near[i+8] + in_far[i+8], 7); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2808 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2809 // horizontal filter, polyphase implementation since it's convenient: |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2810 // even pixels = 3*cur + prev = cur*4 + (prev - cur) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2811 // odd pixels = 3*cur + next = cur*4 + (next - cur) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2812 // note the shared term. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2813 __m128i bias = _mm_set1_epi16(8); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2814 __m128i curs = _mm_slli_epi16(curr, 2); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2815 __m128i prvd = _mm_sub_epi16(prev, curr); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2816 __m128i nxtd = _mm_sub_epi16(next, curr); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2817 __m128i curb = _mm_add_epi16(curs, bias); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2818 __m128i even = _mm_add_epi16(prvd, curb); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2819 __m128i odd = _mm_add_epi16(nxtd, curb); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2820 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2821 // interleave even and odd pixels, then undo scaling. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2822 __m128i int0 = _mm_unpacklo_epi16(even, odd); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2823 __m128i int1 = _mm_unpackhi_epi16(even, odd); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2824 __m128i de0 = _mm_srli_epi16(int0, 4); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2825 __m128i de1 = _mm_srli_epi16(int1, 4); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2826 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2827 // pack and write output |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2828 __m128i outv = _mm_packus_epi16(de0, de1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2829 _mm_storeu_si128((__m128i *) (out + i*2), outv); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2830 #elif defined(STBI_NEON) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2831 // load and perform the vertical filtering pass |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2832 // this uses 3*x + y = 4*x + (y - x) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2833 uint8x8_t farb = vld1_u8(in_far + i); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2834 uint8x8_t nearb = vld1_u8(in_near + i); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2835 int16x8_t diff = vreinterpretq_s16_u16(vsubl_u8(farb, nearb)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2836 int16x8_t nears = vreinterpretq_s16_u16(vshll_n_u8(nearb, 2)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2837 int16x8_t curr = vaddq_s16(nears, diff); // current row |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2838 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2839 // horizontal filter works the same based on shifted vers of current |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2840 // row. "prev" is current row shifted right by 1 pixel; we need to |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2841 // insert the previous pixel value (from t1). |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2842 // "next" is current row shifted left by 1 pixel, with first pixel |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2843 // of next block of 8 pixels added in. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2844 int16x8_t prv0 = vextq_s16(curr, curr, 7); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2845 int16x8_t nxt0 = vextq_s16(curr, curr, 1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2846 int16x8_t prev = vsetq_lane_s16(t1, prv0, 0); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2847 int16x8_t next = vsetq_lane_s16(3*in_near[i+8] + in_far[i+8], nxt0, 7); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2848 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2849 // horizontal filter, polyphase implementation since it's convenient: |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2850 // even pixels = 3*cur + prev = cur*4 + (prev - cur) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2851 // odd pixels = 3*cur + next = cur*4 + (next - cur) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2852 // note the shared term. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2853 int16x8_t curs = vshlq_n_s16(curr, 2); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2854 int16x8_t prvd = vsubq_s16(prev, curr); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2855 int16x8_t nxtd = vsubq_s16(next, curr); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2856 int16x8_t even = vaddq_s16(curs, prvd); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2857 int16x8_t odd = vaddq_s16(curs, nxtd); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2858 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2859 // undo scaling and round, then store with even/odd phases interleaved |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2860 uint8x8x2_t o; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2861 o.val[0] = vqrshrun_n_s16(even, 4); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2862 o.val[1] = vqrshrun_n_s16(odd, 4); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2863 vst2_u8(out + i*2, o); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2864 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2865 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2866 // "previous" value for next iter |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2867 t1 = 3*in_near[i+7] + in_far[i+7]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2868 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2869 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2870 t0 = t1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2871 t1 = 3*in_near[i] + in_far[i]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2872 out[i*2] = stbi__div16(3*t1 + t0 + 8); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2873 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2874 for (++i; i < w; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2875 t0 = t1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2876 t1 = 3*in_near[i]+in_far[i]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2877 out[i*2-1] = stbi__div16(3*t0 + t1 + 8); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2878 out[i*2 ] = stbi__div16(3*t1 + t0 + 8); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2879 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2880 out[w*2-1] = stbi__div4(t1+2); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2881 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2882 STBI_NOTUSED(hs); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2883 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2884 return out; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2885 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2886 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2887 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2888 static Uint8 *stbi__resample_row_generic(Uint8 *out, Uint8 *in_near, Uint8 *in_far, int w, int hs) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2889 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2890 // resample with nearest-neighbor |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2891 int i,j; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2892 STBI_NOTUSED(in_far); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2893 for (i=0; i < w; ++i) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2894 for (j=0; j < hs; ++j) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2895 out[i*hs+j] = in_near[i]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2896 return out; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2897 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2898 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2899 #ifdef STBI_JPEG_OLD |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2900 // this is the same YCbCr-to-RGB calculation that stb_image has used |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2901 // historically before the algorithm changes in 1.49 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2902 #define float2fixed(x) ((int) ((x) * 65536 + 0.5)) |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2903 static void stbi__YCbCr_to_RGB_row(Uint8 *out, const Uint8 *y, const Uint8 *pcb, const Uint8 *pcr, int count, int step) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2904 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2905 int i; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2906 for (i=0; i < count; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2907 int y_fixed = (y[i] << 16) + 32768; // rounding |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2908 int r,g,b; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2909 int cr = pcr[i] - 128; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2910 int cb = pcb[i] - 128; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2911 r = y_fixed + cr*float2fixed(1.40200f); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2912 g = y_fixed - cr*float2fixed(0.71414f) - cb*float2fixed(0.34414f); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2913 b = y_fixed + cb*float2fixed(1.77200f); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2914 r >>= 16; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2915 g >>= 16; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2916 b >>= 16; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2917 if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2918 if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2919 if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; } |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2920 out[0] = (Uint8)r; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2921 out[1] = (Uint8)g; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2922 out[2] = (Uint8)b; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2923 out[3] = 255; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2924 out += step; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2925 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2926 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2927 #else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2928 // this is a reduced-precision calculation of YCbCr-to-RGB introduced |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2929 // to make sure the code produces the same results in both SIMD and scalar |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2930 #define float2fixed(x) (((int) ((x) * 4096.0f + 0.5f)) << 8) |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2931 static void stbi__YCbCr_to_RGB_row(Uint8 *out, const Uint8 *y, const Uint8 *pcb, const Uint8 *pcr, int count, int step) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2932 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2933 int i; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2934 for (i=0; i < count; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2935 int y_fixed = (y[i] << 20) + (1<<19); // rounding |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2936 int r,g,b; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2937 int cr = pcr[i] - 128; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2938 int cb = pcb[i] - 128; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2939 r = y_fixed + cr* float2fixed(1.40200f); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2940 g = y_fixed + (cr*-float2fixed(0.71414f)) + ((cb*-float2fixed(0.34414f)) & 0xffff0000); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2941 b = y_fixed + cb* float2fixed(1.77200f); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2942 r >>= 20; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2943 g >>= 20; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2944 b >>= 20; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2945 if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2946 if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2947 if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; } |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2948 out[0] = (Uint8)r; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2949 out[1] = (Uint8)g; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2950 out[2] = (Uint8)b; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2951 out[3] = 255; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2952 out += step; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2953 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2954 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2955 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2956 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2957 #if defined(STBI_SSE2) || defined(STBI_NEON) |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
2958 static void stbi__YCbCr_to_RGB_simd(Uint8 *out, Uint8 const *y, Uint8 const *pcb, Uint8 const *pcr, int count, int step) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2959 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2960 int i = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2961 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2962 #ifdef STBI_SSE2 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2963 // step == 3 is pretty ugly on the final interleave, and i'm not convinced |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2964 // it's useful in practice (you wouldn't use it for textures, for example). |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2965 // so just accelerate step == 4 case. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2966 if (step == 4) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2967 // this is a fairly straightforward implementation and not super-optimized. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2968 __m128i signflip = _mm_set1_epi8(-0x80); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2969 __m128i cr_const0 = _mm_set1_epi16( (short) ( 1.40200f*4096.0f+0.5f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2970 __m128i cr_const1 = _mm_set1_epi16( - (short) ( 0.71414f*4096.0f+0.5f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2971 __m128i cb_const0 = _mm_set1_epi16( - (short) ( 0.34414f*4096.0f+0.5f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2972 __m128i cb_const1 = _mm_set1_epi16( (short) ( 1.77200f*4096.0f+0.5f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2973 __m128i y_bias = _mm_set1_epi8((char) (unsigned char) 128); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2974 __m128i xw = _mm_set1_epi16(255); // alpha channel |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2975 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2976 for (; i+7 < count; i += 8) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2977 // load |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2978 __m128i y_bytes = _mm_loadl_epi64((__m128i *) (y+i)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2979 __m128i cr_bytes = _mm_loadl_epi64((__m128i *) (pcr+i)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2980 __m128i cb_bytes = _mm_loadl_epi64((__m128i *) (pcb+i)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2981 __m128i cr_biased = _mm_xor_si128(cr_bytes, signflip); // -128 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2982 __m128i cb_biased = _mm_xor_si128(cb_bytes, signflip); // -128 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2983 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2984 // unpack to short (and left-shift cr, cb by 8) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2985 __m128i yw = _mm_unpacklo_epi8(y_bias, y_bytes); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2986 __m128i crw = _mm_unpacklo_epi8(_mm_setzero_si128(), cr_biased); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2987 __m128i cbw = _mm_unpacklo_epi8(_mm_setzero_si128(), cb_biased); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2988 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2989 // color transform |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2990 __m128i yws = _mm_srli_epi16(yw, 4); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2991 __m128i cr0 = _mm_mulhi_epi16(cr_const0, crw); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2992 __m128i cb0 = _mm_mulhi_epi16(cb_const0, cbw); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2993 __m128i cb1 = _mm_mulhi_epi16(cbw, cb_const1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2994 __m128i cr1 = _mm_mulhi_epi16(crw, cr_const1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2995 __m128i rws = _mm_add_epi16(cr0, yws); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2996 __m128i gwt = _mm_add_epi16(cb0, yws); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2997 __m128i bws = _mm_add_epi16(yws, cb1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2998 __m128i gws = _mm_add_epi16(gwt, cr1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
2999 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3000 // descale |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3001 __m128i rw = _mm_srai_epi16(rws, 4); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3002 __m128i bw = _mm_srai_epi16(bws, 4); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3003 __m128i gw = _mm_srai_epi16(gws, 4); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3004 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3005 // back to byte, set up for transpose |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3006 __m128i brb = _mm_packus_epi16(rw, bw); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3007 __m128i gxb = _mm_packus_epi16(gw, xw); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3008 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3009 // transpose to interleave channels |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3010 __m128i t0 = _mm_unpacklo_epi8(brb, gxb); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3011 __m128i t1 = _mm_unpackhi_epi8(brb, gxb); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3012 __m128i o0 = _mm_unpacklo_epi16(t0, t1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3013 __m128i o1 = _mm_unpackhi_epi16(t0, t1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3014 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3015 // store |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3016 _mm_storeu_si128((__m128i *) (out + 0), o0); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3017 _mm_storeu_si128((__m128i *) (out + 16), o1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3018 out += 32; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3019 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3020 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3021 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3022 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3023 #ifdef STBI_NEON |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3024 // in this version, step=3 support would be easy to add. but is there demand? |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3025 if (step == 4) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3026 // this is a fairly straightforward implementation and not super-optimized. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3027 uint8x8_t signflip = vdup_n_u8(0x80); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3028 int16x8_t cr_const0 = vdupq_n_s16( (short) ( 1.40200f*4096.0f+0.5f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3029 int16x8_t cr_const1 = vdupq_n_s16( - (short) ( 0.71414f*4096.0f+0.5f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3030 int16x8_t cb_const0 = vdupq_n_s16( - (short) ( 0.34414f*4096.0f+0.5f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3031 int16x8_t cb_const1 = vdupq_n_s16( (short) ( 1.77200f*4096.0f+0.5f)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3032 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3033 for (; i+7 < count; i += 8) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3034 // load |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3035 uint8x8_t y_bytes = vld1_u8(y + i); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3036 uint8x8_t cr_bytes = vld1_u8(pcr + i); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3037 uint8x8_t cb_bytes = vld1_u8(pcb + i); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3038 int8x8_t cr_biased = vreinterpret_s8_u8(vsub_u8(cr_bytes, signflip)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3039 int8x8_t cb_biased = vreinterpret_s8_u8(vsub_u8(cb_bytes, signflip)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3040 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3041 // expand to s16 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3042 int16x8_t yws = vreinterpretq_s16_u16(vshll_n_u8(y_bytes, 4)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3043 int16x8_t crw = vshll_n_s8(cr_biased, 7); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3044 int16x8_t cbw = vshll_n_s8(cb_biased, 7); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3045 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3046 // color transform |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3047 int16x8_t cr0 = vqdmulhq_s16(crw, cr_const0); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3048 int16x8_t cb0 = vqdmulhq_s16(cbw, cb_const0); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3049 int16x8_t cr1 = vqdmulhq_s16(crw, cr_const1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3050 int16x8_t cb1 = vqdmulhq_s16(cbw, cb_const1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3051 int16x8_t rws = vaddq_s16(yws, cr0); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3052 int16x8_t gws = vaddq_s16(vaddq_s16(yws, cb0), cr1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3053 int16x8_t bws = vaddq_s16(yws, cb1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3054 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3055 // undo scaling, round, convert to byte |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3056 uint8x8x4_t o; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3057 o.val[0] = vqrshrun_n_s16(rws, 4); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3058 o.val[1] = vqrshrun_n_s16(gws, 4); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3059 o.val[2] = vqrshrun_n_s16(bws, 4); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3060 o.val[3] = vdup_n_u8(255); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3061 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3062 // store, interleaving r/g/b/a |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3063 vst4_u8(out, o); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3064 out += 8*4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3065 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3066 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3067 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3068 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3069 for (; i < count; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3070 int y_fixed = (y[i] << 20) + (1<<19); // rounding |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3071 int r,g,b; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3072 int cr = pcr[i] - 128; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3073 int cb = pcb[i] - 128; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3074 r = y_fixed + cr* float2fixed(1.40200f); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3075 g = y_fixed + cr*-float2fixed(0.71414f) + ((cb*-float2fixed(0.34414f)) & 0xffff0000); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3076 b = y_fixed + cb* float2fixed(1.77200f); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3077 r >>= 20; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3078 g >>= 20; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3079 b >>= 20; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3080 if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3081 if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3082 if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; } |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3083 out[0] = (Uint8)r; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3084 out[1] = (Uint8)g; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3085 out[2] = (Uint8)b; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3086 out[3] = 255; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3087 out += step; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3088 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3089 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3090 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3091 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3092 // set up the kernels |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3093 static void stbi__setup_jpeg(stbi__jpeg *j) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3094 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3095 j->idct_block_kernel = stbi__idct_block; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3096 j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_row; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3097 j->resample_row_hv_2_kernel = stbi__resample_row_hv_2; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3098 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3099 #ifdef STBI_SSE2 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3100 if (stbi__sse2_available()) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3101 j->idct_block_kernel = stbi__idct_simd; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3102 #ifndef STBI_JPEG_OLD |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3103 j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3104 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3105 j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3106 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3107 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3108 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3109 #ifdef STBI_NEON |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3110 j->idct_block_kernel = stbi__idct_simd; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3111 #ifndef STBI_JPEG_OLD |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3112 j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3113 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3114 j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3115 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3116 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3117 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3118 // clean up the temporary component buffers |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3119 static void stbi__cleanup_jpeg(stbi__jpeg *j) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3120 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3121 int i; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3122 for (i=0; i < j->s->img_n; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3123 if (j->img_comp[i].raw_data) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3124 STBI_FREE(j->img_comp[i].raw_data); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3125 j->img_comp[i].raw_data = NULL; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3126 j->img_comp[i].data = NULL; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3127 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3128 if (j->img_comp[i].raw_coeff) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3129 STBI_FREE(j->img_comp[i].raw_coeff); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3130 j->img_comp[i].raw_coeff = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3131 j->img_comp[i].coeff = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3132 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3133 if (j->img_comp[i].linebuf) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3134 STBI_FREE(j->img_comp[i].linebuf); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3135 j->img_comp[i].linebuf = NULL; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3136 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3137 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3138 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3139 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3140 typedef struct |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3141 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3142 resample_row_func resample; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3143 Uint8 *line0,*line1; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3144 int hs,vs; // expansion factor in each axis |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3145 int w_lores; // horizontal pixels pre-expansion |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3146 int ystep; // how far through vertical expansion we are |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3147 int ypos; // which pre-expansion row we're on |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3148 } stbi__resample; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3149 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3150 static Uint8 *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y, int *comp, int req_comp) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3151 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3152 int n, decode_n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3153 z->s->img_n = 0; // make stbi__cleanup_jpeg safe |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3154 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3155 // validate req_comp |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3156 if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3157 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3158 // load a jpeg image from whichever source, but leave in YCbCr format |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3159 if (!stbi__decode_jpeg_image(z)) { stbi__cleanup_jpeg(z); return NULL; } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3160 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3161 // determine actual number of components to generate |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3162 n = req_comp ? req_comp : z->s->img_n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3163 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3164 if (z->s->img_n == 3 && n < 3) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3165 decode_n = 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3166 else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3167 decode_n = z->s->img_n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3168 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3169 // resample and color-convert |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3170 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3171 int k; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3172 unsigned int i,j; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3173 Uint8 *output; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3174 Uint8 *coutput[4]; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3175 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3176 stbi__resample res_comp[4]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3177 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3178 for (k=0; k < decode_n; ++k) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3179 stbi__resample *r = &res_comp[k]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3180 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3181 // allocate line buffer big enough for upsampling off the edges |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3182 // with upsample factor of 4 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3183 z->img_comp[k].linebuf = (Uint8 *) stbi__malloc(z->s->img_x + 3); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3184 if (!z->img_comp[k].linebuf) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3185 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3186 r->hs = z->img_h_max / z->img_comp[k].h; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3187 r->vs = z->img_v_max / z->img_comp[k].v; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3188 r->ystep = r->vs >> 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3189 r->w_lores = (z->s->img_x + r->hs-1) / r->hs; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3190 r->ypos = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3191 r->line0 = r->line1 = z->img_comp[k].data; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3192 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3193 if (r->hs == 1 && r->vs == 1) r->resample = resample_row_1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3194 else if (r->hs == 1 && r->vs == 2) r->resample = stbi__resample_row_v_2; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3195 else if (r->hs == 2 && r->vs == 1) r->resample = stbi__resample_row_h_2; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3196 else if (r->hs == 2 && r->vs == 2) r->resample = z->resample_row_hv_2_kernel; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3197 else r->resample = stbi__resample_row_generic; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3198 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3199 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3200 // can't error after this so, this is safe |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3201 output = (Uint8 *) stbi__malloc(n * z->s->img_x * z->s->img_y + 1); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3202 if (!output) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3203 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3204 // now go ahead and resample |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3205 for (j=0; j < z->s->img_y; ++j) { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3206 Uint8 *out = output + n * z->s->img_x * j; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3207 for (k=0; k < decode_n; ++k) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3208 stbi__resample *r = &res_comp[k]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3209 int y_bot = r->ystep >= (r->vs >> 1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3210 coutput[k] = r->resample(z->img_comp[k].linebuf, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3211 y_bot ? r->line1 : r->line0, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3212 y_bot ? r->line0 : r->line1, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3213 r->w_lores, r->hs); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3214 if (++r->ystep >= r->vs) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3215 r->ystep = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3216 r->line0 = r->line1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3217 if (++r->ypos < z->img_comp[k].y) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3218 r->line1 += z->img_comp[k].w2; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3219 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3220 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3221 if (n >= 3) { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3222 Uint8 *y = coutput[0]; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3223 if (z->s->img_n == 3) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3224 z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3225 } else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3226 for (i=0; i < z->s->img_x; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3227 out[0] = out[1] = out[2] = y[i]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3228 out[3] = 255; // not used if n==3 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3229 out += n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3230 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3231 } else { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3232 Uint8 *y = coutput[0]; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3233 if (n == 1) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3234 for (i=0; i < z->s->img_x; ++i) out[i] = y[i]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3235 else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3236 for (i=0; i < z->s->img_x; ++i) *out++ = y[i], *out++ = 255; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3237 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3238 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3239 stbi__cleanup_jpeg(z); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3240 *out_x = z->s->img_x; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3241 *out_y = z->s->img_y; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3242 if (comp) *comp = z->s->img_n; // report original components, not output |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3243 return output; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3244 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3245 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3246 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3247 static unsigned char *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3248 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3249 stbi__jpeg j; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3250 j.s = s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3251 stbi__setup_jpeg(&j); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3252 return load_jpeg_image(&j, x,y,comp,req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3253 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3254 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3255 static int stbi__jpeg_test(stbi__context *s) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3256 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3257 int r; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3258 stbi__jpeg j; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3259 j.s = s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3260 stbi__setup_jpeg(&j); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3261 r = stbi__decode_jpeg_header(&j, STBI__SCAN_type); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3262 stbi__rewind(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3263 return r; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3264 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3265 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3266 static int stbi__jpeg_info_raw(stbi__jpeg *j, int *x, int *y, int *comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3267 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3268 if (!stbi__decode_jpeg_header(j, STBI__SCAN_header)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3269 stbi__rewind( j->s ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3270 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3271 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3272 if (x) *x = j->s->img_x; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3273 if (y) *y = j->s->img_y; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3274 if (comp) *comp = j->s->img_n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3275 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3276 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3277 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3278 static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3279 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3280 stbi__jpeg j; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3281 j.s = s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3282 return stbi__jpeg_info_raw(&j, x, y, comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3283 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3284 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3285 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3286 |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3287 // public domain zlib decode v0.2 Sean Barrett 2006-11-18 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3288 // simple implementation |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3289 // - all input must be provided in an upfront buffer |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3290 // - all output is written to a single output buffer (can malloc/realloc) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3291 // performance |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3292 // - fast huffman |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3293 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3294 #ifdef STBI_INTERNAL_ZLIB |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3295 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3296 // fast-way is faster to check than jpeg huffman, but slow way is slower |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3297 #define STBI__ZFAST_BITS 9 // accelerate all cases in default tables |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3298 #define STBI__ZFAST_MASK ((1 << STBI__ZFAST_BITS) - 1) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3299 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3300 // zlib-style huffman encoding |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3301 // (jpegs packs from left, zlib from right, so can't share code) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3302 typedef struct |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3303 { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3304 Uint16 fast[1 << STBI__ZFAST_BITS]; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3305 Uint16 firstcode[16]; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3306 int maxcode[17]; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3307 Uint16 firstsymbol[16]; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3308 Uint8 size[288]; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3309 Uint16 value[288]; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3310 } stbi__zhuffman; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3311 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3312 stbi_inline static int stbi__bitreverse16(int n) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3313 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3314 n = ((n & 0xAAAA) >> 1) | ((n & 0x5555) << 1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3315 n = ((n & 0xCCCC) >> 2) | ((n & 0x3333) << 2); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3316 n = ((n & 0xF0F0) >> 4) | ((n & 0x0F0F) << 4); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3317 n = ((n & 0xFF00) >> 8) | ((n & 0x00FF) << 8); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3318 return n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3319 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3320 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3321 stbi_inline static int stbi__bit_reverse(int v, int bits) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3322 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3323 STBI_ASSERT(bits <= 16); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3324 // to bit reverse n bits, reverse 16 and shift |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3325 // e.g. 11 bits, bit reverse and shift away 5 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3326 return stbi__bitreverse16(v) >> (16-bits); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3327 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3328 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3329 static int stbi__zbuild_huffman(stbi__zhuffman *z, Uint8 *sizelist, int num) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3330 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3331 int i,k=0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3332 int code, next_code[16], sizes[17]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3333 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3334 // DEFLATE spec for generating codes |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3335 memset(sizes, 0, sizeof(sizes)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3336 memset(z->fast, 0, sizeof(z->fast)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3337 for (i=0; i < num; ++i) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3338 ++sizes[sizelist[i]]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3339 sizes[0] = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3340 for (i=1; i < 16; ++i) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3341 STBI_ASSERT(sizes[i] <= (1 << i)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3342 code = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3343 for (i=1; i < 16; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3344 next_code[i] = code; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3345 z->firstcode[i] = (Uint16) code; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3346 z->firstsymbol[i] = (Uint16) k; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3347 code = (code + sizes[i]); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3348 if (sizes[i]) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3349 if (code-1 >= (1 << i)) return stbi__err("bad codelengths","Corrupt JPEG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3350 z->maxcode[i] = code << (16-i); // preshift for inner loop |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3351 code <<= 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3352 k += sizes[i]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3353 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3354 z->maxcode[16] = 0x10000; // sentinel |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3355 for (i=0; i < num; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3356 int s = sizelist[i]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3357 if (s) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3358 int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s]; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3359 Uint16 fastv = (Uint16) ((s << 9) | i); |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3360 z->size [c] = (Uint8) s; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3361 z->value[c] = (Uint16) i; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3362 if (s <= STBI__ZFAST_BITS) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3363 int k = stbi__bit_reverse(next_code[s],s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3364 while (k < (1 << STBI__ZFAST_BITS)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3365 z->fast[k] = fastv; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3366 k += (1 << s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3367 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3368 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3369 ++next_code[s]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3370 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3371 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3372 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3373 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3374 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3375 // zlib-from-memory implementation for PNG reading |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3376 // because PNG allows splitting the zlib stream arbitrarily, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3377 // and it's annoying structurally to have PNG call ZLIB call PNG, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3378 // we require PNG read all the IDATs and combine them into a single |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3379 // memory buffer |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3380 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3381 typedef struct |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3382 { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3383 Uint8 *zbuffer, *zbuffer_end; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3384 int num_bits; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3385 Uint32 code_buffer; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3386 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3387 char *zout; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3388 char *zout_start; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3389 char *zout_end; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3390 int z_expandable; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3391 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3392 stbi__zhuffman z_length, z_distance; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3393 } stbi__zbuf; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3394 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3395 stbi_inline static Uint8 stbi__zget8(stbi__zbuf *z) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3396 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3397 if (z->zbuffer >= z->zbuffer_end) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3398 return *z->zbuffer++; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3399 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3400 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3401 static void stbi__fill_bits(stbi__zbuf *z) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3402 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3403 do { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3404 STBI_ASSERT(z->code_buffer < (1U << z->num_bits)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3405 z->code_buffer |= stbi__zget8(z) << z->num_bits; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3406 z->num_bits += 8; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3407 } while (z->num_bits <= 24); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3408 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3409 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3410 stbi_inline static unsigned int stbi__zreceive(stbi__zbuf *z, int n) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3411 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3412 unsigned int k; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3413 if (z->num_bits < n) stbi__fill_bits(z); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3414 k = z->code_buffer & ((1 << n) - 1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3415 z->code_buffer >>= n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3416 z->num_bits -= n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3417 return k; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3418 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3419 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3420 static int stbi__zhuffman_decode_slowpath(stbi__zbuf *a, stbi__zhuffman *z) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3421 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3422 int b,s,k; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3423 // not resolved by fast table, so compute it the slow way |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3424 // use jpeg approach, which requires MSbits at top |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3425 k = stbi__bit_reverse(a->code_buffer, 16); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3426 for (s=STBI__ZFAST_BITS+1; ; ++s) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3427 if (k < z->maxcode[s]) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3428 break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3429 if (s == 16) return -1; // invalid code! |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3430 // code size is s, so: |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3431 b = (k >> (16-s)) - z->firstcode[s] + z->firstsymbol[s]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3432 STBI_ASSERT(z->size[b] == s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3433 a->code_buffer >>= s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3434 a->num_bits -= s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3435 return z->value[b]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3436 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3437 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3438 stbi_inline static int stbi__zhuffman_decode(stbi__zbuf *a, stbi__zhuffman *z) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3439 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3440 int b,s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3441 if (a->num_bits < 16) stbi__fill_bits(a); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3442 b = z->fast[a->code_buffer & STBI__ZFAST_MASK]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3443 if (b) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3444 s = b >> 9; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3445 a->code_buffer >>= s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3446 a->num_bits -= s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3447 return b & 511; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3448 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3449 return stbi__zhuffman_decode_slowpath(a, z); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3450 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3451 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3452 static int stbi__zexpand(stbi__zbuf *z, char *zout, int n) // need to make room for n bytes |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3453 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3454 char *q; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3455 int cur, limit; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3456 z->zout = zout; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3457 if (!z->z_expandable) return stbi__err("output buffer limit","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3458 cur = (int) (z->zout - z->zout_start); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3459 limit = (int) (z->zout_end - z->zout_start); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3460 while (cur + n > limit) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3461 limit *= 2; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3462 q = (char *) STBI_REALLOC(z->zout_start, limit); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3463 if (q == NULL) return stbi__err("outofmem", "Out of memory"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3464 z->zout_start = q; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3465 z->zout = q + cur; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3466 z->zout_end = q + limit; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3467 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3468 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3469 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3470 static int stbi__zlength_base[31] = { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3471 3,4,5,6,7,8,9,10,11,13, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3472 15,17,19,23,27,31,35,43,51,59, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3473 67,83,99,115,131,163,195,227,258,0,0 }; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3474 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3475 static int stbi__zlength_extra[31]= |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3476 { 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 }; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3477 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3478 static int stbi__zdist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3479 257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0}; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3480 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3481 static int stbi__zdist_extra[32] = |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3482 { 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13}; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3483 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3484 static int stbi__parse_huffman_block(stbi__zbuf *a) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3485 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3486 char *zout = a->zout; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3487 for(;;) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3488 int z = stbi__zhuffman_decode(a, &a->z_length); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3489 if (z < 256) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3490 if (z < 0) return stbi__err("bad huffman code","Corrupt PNG"); // error in huffman codes |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3491 if (zout >= a->zout_end) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3492 if (!stbi__zexpand(a, zout, 1)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3493 zout = a->zout; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3494 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3495 *zout++ = (char) z; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3496 } else { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3497 Uint8 *p; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3498 int len,dist; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3499 if (z == 256) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3500 a->zout = zout; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3501 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3502 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3503 z -= 257; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3504 len = stbi__zlength_base[z]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3505 if (stbi__zlength_extra[z]) len += stbi__zreceive(a, stbi__zlength_extra[z]); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3506 z = stbi__zhuffman_decode(a, &a->z_distance); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3507 if (z < 0) return stbi__err("bad huffman code","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3508 dist = stbi__zdist_base[z]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3509 if (stbi__zdist_extra[z]) dist += stbi__zreceive(a, stbi__zdist_extra[z]); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3510 if (zout - a->zout_start < dist) return stbi__err("bad dist","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3511 if (zout + len > a->zout_end) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3512 if (!stbi__zexpand(a, zout, len)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3513 zout = a->zout; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3514 } |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3515 p = (Uint8 *) (zout - dist); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3516 if (dist == 1) { // run of one byte; common in images. |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3517 Uint8 v = *p; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3518 do *zout++ = v; while (--len); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3519 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3520 do *zout++ = *p++; while (--len); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3521 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3522 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3523 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3524 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3525 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3526 static int stbi__compute_huffman_codes(stbi__zbuf *a) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3527 { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3528 static Uint8 length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 }; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3529 stbi__zhuffman z_codelength; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3530 Uint8 lencodes[286+32+137];//padding for maximum single op |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3531 Uint8 codelength_sizes[19]; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3532 int i,n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3533 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3534 int hlit = stbi__zreceive(a,5) + 257; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3535 int hdist = stbi__zreceive(a,5) + 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3536 int hclen = stbi__zreceive(a,4) + 4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3537 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3538 memset(codelength_sizes, 0, sizeof(codelength_sizes)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3539 for (i=0; i < hclen; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3540 int s = stbi__zreceive(a,3); |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3541 codelength_sizes[length_dezigzag[i]] = (Uint8) s; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3542 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3543 if (!stbi__zbuild_huffman(&z_codelength, codelength_sizes, 19)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3544 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3545 n = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3546 while (n < hlit + hdist) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3547 int c = stbi__zhuffman_decode(a, &z_codelength); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3548 STBI_ASSERT(c >= 0 && c < 19); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3549 if (c < 16) |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3550 lencodes[n++] = (Uint8) c; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3551 else if (c == 16) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3552 c = stbi__zreceive(a,2)+3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3553 memset(lencodes+n, lencodes[n-1], c); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3554 n += c; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3555 } else if (c == 17) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3556 c = stbi__zreceive(a,3)+3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3557 memset(lencodes+n, 0, c); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3558 n += c; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3559 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3560 STBI_ASSERT(c == 18); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3561 c = stbi__zreceive(a,7)+11; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3562 memset(lencodes+n, 0, c); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3563 n += c; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3564 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3565 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3566 if (n != hlit+hdist) return stbi__err("bad codelengths","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3567 if (!stbi__zbuild_huffman(&a->z_length, lencodes, hlit)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3568 if (!stbi__zbuild_huffman(&a->z_distance, lencodes+hlit, hdist)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3569 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3570 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3571 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3572 static int stbi__parse_uncomperssed_block(stbi__zbuf *a) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3573 { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3574 Uint8 header[4]; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3575 int len,nlen,k; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3576 if (a->num_bits & 7) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3577 stbi__zreceive(a, a->num_bits & 7); // discard |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3578 // drain the bit-packed data into header |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3579 k = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3580 while (a->num_bits > 0) { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3581 header[k++] = (Uint8) (a->code_buffer & 255); // suppress MSVC run-time check |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3582 a->code_buffer >>= 8; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3583 a->num_bits -= 8; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3584 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3585 STBI_ASSERT(a->num_bits == 0); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3586 // now fill header the normal way |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3587 while (k < 4) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3588 header[k++] = stbi__zget8(a); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3589 len = header[1] * 256 + header[0]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3590 nlen = header[3] * 256 + header[2]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3591 if (nlen != (len ^ 0xffff)) return stbi__err("zlib corrupt","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3592 if (a->zbuffer + len > a->zbuffer_end) return stbi__err("read past buffer","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3593 if (a->zout + len > a->zout_end) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3594 if (!stbi__zexpand(a, a->zout, len)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3595 memcpy(a->zout, a->zbuffer, len); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3596 a->zbuffer += len; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3597 a->zout += len; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3598 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3599 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3600 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3601 static int stbi__parse_zlib_header(stbi__zbuf *a) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3602 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3603 int cmf = stbi__zget8(a); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3604 int cm = cmf & 15; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3605 /* int cinfo = cmf >> 4; */ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3606 int flg = stbi__zget8(a); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3607 if ((cmf*256+flg) % 31 != 0) return stbi__err("bad zlib header","Corrupt PNG"); // zlib spec |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3608 if (flg & 32) return stbi__err("no preset dict","Corrupt PNG"); // preset dictionary not allowed in png |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3609 if (cm != 8) return stbi__err("bad compression","Corrupt PNG"); // DEFLATE required for png |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3610 // window = 1 << (8 + cinfo)... but who cares, we fully buffer output |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3611 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3612 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3613 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3614 // @TODO: should statically initialize these for optimal thread safety |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3615 static Uint8 stbi__zdefault_length[288], stbi__zdefault_distance[32]; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3616 static void stbi__init_zdefaults(void) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3617 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3618 int i; // use <= to match clearly with spec |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3619 for (i=0; i <= 143; ++i) stbi__zdefault_length[i] = 8; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3620 for ( ; i <= 255; ++i) stbi__zdefault_length[i] = 9; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3621 for ( ; i <= 279; ++i) stbi__zdefault_length[i] = 7; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3622 for ( ; i <= 287; ++i) stbi__zdefault_length[i] = 8; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3623 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3624 for (i=0; i <= 31; ++i) stbi__zdefault_distance[i] = 5; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3625 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3626 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3627 static int stbi__parse_zlib(stbi__zbuf *a, int parse_header) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3628 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3629 int final, type; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3630 if (parse_header) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3631 if (!stbi__parse_zlib_header(a)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3632 a->num_bits = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3633 a->code_buffer = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3634 do { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3635 final = stbi__zreceive(a,1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3636 type = stbi__zreceive(a,2); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3637 if (type == 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3638 if (!stbi__parse_uncomperssed_block(a)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3639 } else if (type == 3) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3640 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3641 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3642 if (type == 1) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3643 // use fixed code lengths |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3644 if (!stbi__zdefault_distance[31]) stbi__init_zdefaults(); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3645 if (!stbi__zbuild_huffman(&a->z_length , stbi__zdefault_length , 288)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3646 if (!stbi__zbuild_huffman(&a->z_distance, stbi__zdefault_distance, 32)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3647 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3648 if (!stbi__compute_huffman_codes(a)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3649 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3650 if (!stbi__parse_huffman_block(a)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3651 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3652 } while (!final); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3653 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3654 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3655 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3656 static int stbi__do_zlib(stbi__zbuf *a, char *obuf, int olen, int exp, int parse_header) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3657 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3658 a->zout_start = obuf; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3659 a->zout = obuf; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3660 a->zout_end = obuf + olen; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3661 a->z_expandable = exp; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3662 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3663 return stbi__parse_zlib(a, parse_header); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3664 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3665 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3666 STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3667 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3668 stbi__zbuf a; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3669 char *p = (char *) stbi__malloc(initial_size); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3670 if (p == NULL) return NULL; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3671 a.zbuffer = (Uint8 *) buffer; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3672 a.zbuffer_end = (Uint8 *) buffer + len; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3673 if (stbi__do_zlib(&a, p, initial_size, 1, 1)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3674 if (outlen) *outlen = (int) (a.zout - a.zout_start); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3675 return a.zout_start; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3676 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3677 STBI_FREE(a.zout_start); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3678 return NULL; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3679 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3680 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3681 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3682 STBIDEF char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3683 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3684 return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3685 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3686 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3687 STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3688 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3689 stbi__zbuf a; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3690 char *p = (char *) stbi__malloc(initial_size); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3691 if (p == NULL) return NULL; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3692 a.zbuffer = (Uint8 *) buffer; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3693 a.zbuffer_end = (Uint8 *) buffer + len; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3694 if (stbi__do_zlib(&a, p, initial_size, 1, parse_header)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3695 if (outlen) *outlen = (int) (a.zout - a.zout_start); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3696 return a.zout_start; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3697 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3698 STBI_FREE(a.zout_start); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3699 return NULL; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3700 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3701 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3702 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3703 STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3704 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3705 stbi__zbuf a; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3706 a.zbuffer = (Uint8 *) ibuffer; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3707 a.zbuffer_end = (Uint8 *) ibuffer + ilen; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3708 if (stbi__do_zlib(&a, obuffer, olen, 0, 1)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3709 return (int) (a.zout - a.zout_start); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3710 else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3711 return -1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3712 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3713 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3714 STBIDEF char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3715 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3716 stbi__zbuf a; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3717 char *p = (char *) stbi__malloc(16384); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3718 if (p == NULL) return NULL; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3719 a.zbuffer = (Uint8 *) buffer; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3720 a.zbuffer_end = (Uint8 *) buffer+len; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3721 if (stbi__do_zlib(&a, p, 16384, 1, 0)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3722 if (outlen) *outlen = (int) (a.zout - a.zout_start); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3723 return a.zout_start; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3724 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3725 STBI_FREE(a.zout_start); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3726 return NULL; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3727 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3728 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3729 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3730 STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3731 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3732 stbi__zbuf a; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3733 a.zbuffer = (Uint8 *) ibuffer; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3734 a.zbuffer_end = (Uint8 *) ibuffer + ilen; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3735 if (stbi__do_zlib(&a, obuffer, olen, 0, 0)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3736 return (int) (a.zout - a.zout_start); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3737 else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3738 return -1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3739 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3740 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3741 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3742 // public domain "baseline" PNG decoder v0.10 Sean Barrett 2006-11-18 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3743 // simple implementation |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3744 // - only 8-bit samples |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3745 // - no CRC checking |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3746 // - allocates lots of intermediate memory |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3747 // - avoids problem of streaming data between subsystems |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3748 // - avoids explicit window management |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3749 // performance |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3750 // - uses stb_zlib, a PD zlib implementation with fast huffman decoding |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3751 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3752 #ifndef STBI_NO_PNG |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3753 typedef struct |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3754 { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3755 Uint32 length; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3756 Uint32 type; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3757 } stbi__pngchunk; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3758 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3759 static stbi__pngchunk stbi__get_chunk_header(stbi__context *s) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3760 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3761 stbi__pngchunk c; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3762 c.length = stbi__get32be(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3763 c.type = stbi__get32be(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3764 return c; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3765 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3766 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3767 static int stbi__check_png_header(stbi__context *s) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3768 { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3769 static Uint8 png_sig[8] = { 137,80,78,71,13,10,26,10 }; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3770 int i; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3771 for (i=0; i < 8; ++i) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3772 if (stbi__get8(s) != png_sig[i]) return stbi__err("bad png sig","Not a PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3773 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3774 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3775 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3776 typedef struct |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3777 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3778 stbi__context *s; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3779 Uint8 *idata, *expanded, *out; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3780 } stbi__png; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3781 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3782 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3783 enum { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3784 STBI__F_none=0, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3785 STBI__F_sub=1, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3786 STBI__F_up=2, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3787 STBI__F_avg=3, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3788 STBI__F_paeth=4, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3789 // synthetic filters used for first scanline to avoid needing a dummy row of 0s |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3790 STBI__F_avg_first, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3791 STBI__F_paeth_first |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3792 }; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3793 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3794 static Uint8 first_row_filter[5] = |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3795 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3796 STBI__F_none, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3797 STBI__F_sub, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3798 STBI__F_none, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3799 STBI__F_avg_first, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3800 STBI__F_paeth_first |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3801 }; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3802 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3803 static int stbi__paeth(int a, int b, int c) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3804 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3805 int p = a + b - c; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3806 int pa = abs(p-a); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3807 int pb = abs(p-b); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3808 int pc = abs(p-c); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3809 if (pa <= pb && pa <= pc) return a; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3810 if (pb <= pc) return b; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3811 return c; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3812 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3813 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3814 static Uint8 stbi__depth_scale_table[9] = { 0, 0xff, 0x55, 0, 0x11, 0,0,0, 0x01 }; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3815 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3816 // create the png data from post-deflated data |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3817 static int stbi__create_png_image_raw(stbi__png *a, Uint8 *raw, Uint32 raw_len, int out_n, Uint32 x, Uint32 y, int depth, int color) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3818 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3819 stbi__context *s = a->s; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3820 Uint32 i,j,stride = x*out_n; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3821 Uint32 img_len, img_width_bytes; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3822 int k; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3823 int img_n = s->img_n; // copy it into a local for later |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3824 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3825 STBI_ASSERT(out_n == s->img_n || out_n == s->img_n+1); |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3826 a->out = (Uint8 *) stbi__malloc(x * y * out_n); // extra bytes to write off the end into |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3827 if (!a->out) return stbi__err("outofmem", "Out of memory"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3828 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3829 img_width_bytes = (((img_n * x * depth) + 7) >> 3); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3830 img_len = (img_width_bytes + 1) * y; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3831 if (s->img_x == x && s->img_y == y) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3832 if (raw_len != img_len) return stbi__err("not enough pixels","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3833 } else { // interlaced: |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3834 if (raw_len < img_len) return stbi__err("not enough pixels","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3835 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3836 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3837 for (j=0; j < y; ++j) { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3838 Uint8 *cur = a->out + stride*j; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3839 Uint8 *prior = cur - stride; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3840 int filter = *raw++; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3841 int filter_bytes = img_n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3842 int width = x; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3843 if (filter > 4) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3844 return stbi__err("invalid filter","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3845 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3846 if (depth < 8) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3847 STBI_ASSERT(img_width_bytes <= x); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3848 cur += x*out_n - img_width_bytes; // store output to the rightmost img_len bytes, so we can decode in place |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3849 filter_bytes = 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3850 width = img_width_bytes; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3851 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3852 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3853 // if first row, use special filter that doesn't sample previous row |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3854 if (j == 0) filter = first_row_filter[filter]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3855 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3856 // handle first byte explicitly |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3857 for (k=0; k < filter_bytes; ++k) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3858 switch (filter) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3859 case STBI__F_none : cur[k] = raw[k]; break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3860 case STBI__F_sub : cur[k] = raw[k]; break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3861 case STBI__F_up : cur[k] = STBI__BYTECAST(raw[k] + prior[k]); break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3862 case STBI__F_avg : cur[k] = STBI__BYTECAST(raw[k] + (prior[k]>>1)); break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3863 case STBI__F_paeth : cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(0,prior[k],0)); break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3864 case STBI__F_avg_first : cur[k] = raw[k]; break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3865 case STBI__F_paeth_first: cur[k] = raw[k]; break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3866 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3867 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3868 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3869 if (depth == 8) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3870 if (img_n != out_n) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3871 cur[img_n] = 255; // first pixel |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3872 raw += img_n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3873 cur += out_n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3874 prior += out_n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3875 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3876 raw += 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3877 cur += 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3878 prior += 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3879 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3880 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3881 // this is a little gross, so that we don't switch per-pixel or per-component |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3882 if (depth < 8 || img_n == out_n) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3883 int nk = (width - 1)*img_n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3884 #define CASE(f) \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3885 case f: \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3886 for (k=0; k < nk; ++k) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3887 switch (filter) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3888 // "none" filter turns into a memcpy here; make that explicit. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3889 case STBI__F_none: memcpy(cur, raw, nk); break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3890 CASE(STBI__F_sub) cur[k] = STBI__BYTECAST(raw[k] + cur[k-filter_bytes]); break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3891 CASE(STBI__F_up) cur[k] = STBI__BYTECAST(raw[k] + prior[k]); break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3892 CASE(STBI__F_avg) cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k-filter_bytes])>>1)); break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3893 CASE(STBI__F_paeth) cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-filter_bytes],prior[k],prior[k-filter_bytes])); break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3894 CASE(STBI__F_avg_first) cur[k] = STBI__BYTECAST(raw[k] + (cur[k-filter_bytes] >> 1)); break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3895 CASE(STBI__F_paeth_first) cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-filter_bytes],0,0)); break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3896 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3897 #undef CASE |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3898 raw += nk; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3899 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3900 STBI_ASSERT(img_n+1 == out_n); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3901 #define CASE(f) \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3902 case f: \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3903 for (i=x-1; i >= 1; --i, cur[img_n]=255,raw+=img_n,cur+=out_n,prior+=out_n) \ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3904 for (k=0; k < img_n; ++k) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3905 switch (filter) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3906 CASE(STBI__F_none) cur[k] = raw[k]; break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3907 CASE(STBI__F_sub) cur[k] = STBI__BYTECAST(raw[k] + cur[k-out_n]); break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3908 CASE(STBI__F_up) cur[k] = STBI__BYTECAST(raw[k] + prior[k]); break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3909 CASE(STBI__F_avg) cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k-out_n])>>1)); break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3910 CASE(STBI__F_paeth) cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-out_n],prior[k],prior[k-out_n])); break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3911 CASE(STBI__F_avg_first) cur[k] = STBI__BYTECAST(raw[k] + (cur[k-out_n] >> 1)); break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3912 CASE(STBI__F_paeth_first) cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-out_n],0,0)); break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3913 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3914 #undef CASE |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3915 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3916 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3917 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3918 // we make a separate pass to expand bits to pixels; for performance, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3919 // this could run two scanlines behind the above code, so it won't |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3920 // intefere with filtering but will still be in the cache. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3921 if (depth < 8) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3922 for (j=0; j < y; ++j) { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3923 Uint8 *cur = a->out + stride*j; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3924 Uint8 *in = a->out + stride*j + x*out_n - img_width_bytes; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3925 // unpack 1/2/4-bit into a 8-bit buffer. allows us to keep the common 8-bit path optimal at minimal cost for 1/2/4-bit |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3926 // png guarante byte alignment, if width is not multiple of 8/4/2 we'll decode dummy trailing data that will be skipped in the later loop |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3927 Uint8 scale = (color == 0) ? stbi__depth_scale_table[depth] : 1; // scale grayscale values to 0..255 range |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3928 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3929 // note that the final byte might overshoot and write more data than desired. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3930 // we can allocate enough data that this never writes out of memory, but it |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3931 // could also overwrite the next scanline. can it overwrite non-empty data |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3932 // on the next scanline? yes, consider 1-pixel-wide scanlines with 1-bit-per-pixel. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3933 // so we need to explicitly clamp the final ones |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3934 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3935 if (depth == 4) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3936 for (k=x*img_n; k >= 2; k-=2, ++in) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3937 *cur++ = scale * ((*in >> 4) ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3938 *cur++ = scale * ((*in ) & 0x0f); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3939 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3940 if (k > 0) *cur++ = scale * ((*in >> 4) ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3941 } else if (depth == 2) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3942 for (k=x*img_n; k >= 4; k-=4, ++in) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3943 *cur++ = scale * ((*in >> 6) ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3944 *cur++ = scale * ((*in >> 4) & 0x03); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3945 *cur++ = scale * ((*in >> 2) & 0x03); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3946 *cur++ = scale * ((*in ) & 0x03); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3947 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3948 if (k > 0) *cur++ = scale * ((*in >> 6) ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3949 if (k > 1) *cur++ = scale * ((*in >> 4) & 0x03); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3950 if (k > 2) *cur++ = scale * ((*in >> 2) & 0x03); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3951 } else if (depth == 1) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3952 for (k=x*img_n; k >= 8; k-=8, ++in) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3953 *cur++ = scale * ((*in >> 7) ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3954 *cur++ = scale * ((*in >> 6) & 0x01); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3955 *cur++ = scale * ((*in >> 5) & 0x01); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3956 *cur++ = scale * ((*in >> 4) & 0x01); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3957 *cur++ = scale * ((*in >> 3) & 0x01); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3958 *cur++ = scale * ((*in >> 2) & 0x01); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3959 *cur++ = scale * ((*in >> 1) & 0x01); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3960 *cur++ = scale * ((*in ) & 0x01); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3961 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3962 if (k > 0) *cur++ = scale * ((*in >> 7) ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3963 if (k > 1) *cur++ = scale * ((*in >> 6) & 0x01); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3964 if (k > 2) *cur++ = scale * ((*in >> 5) & 0x01); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3965 if (k > 3) *cur++ = scale * ((*in >> 4) & 0x01); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3966 if (k > 4) *cur++ = scale * ((*in >> 3) & 0x01); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3967 if (k > 5) *cur++ = scale * ((*in >> 2) & 0x01); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3968 if (k > 6) *cur++ = scale * ((*in >> 1) & 0x01); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3969 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3970 if (img_n != out_n) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3971 // insert alpha = 255 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3972 Uint8 *cur = a->out + stride*j; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3973 int i; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3974 if (img_n == 1) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3975 for (i=x-1; i >= 0; --i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3976 cur[i*2+1] = 255; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3977 cur[i*2+0] = cur[i]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3978 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3979 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3980 STBI_ASSERT(img_n == 3); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3981 for (i=x-1; i >= 0; --i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3982 cur[i*4+3] = 255; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3983 cur[i*4+2] = cur[i*3+2]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3984 cur[i*4+1] = cur[i*3+1]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3985 cur[i*4+0] = cur[i*3+0]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3986 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3987 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3988 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3989 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3990 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3991 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3992 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3993 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3994 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3995 static int stbi__create_png_image(stbi__png *a, Uint8 *image_data, Uint32 image_data_len, int out_n, int depth, int color, int interlaced) |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3996 { |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
3997 Uint8 *final; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3998 int p; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
3999 if (!interlaced) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4000 return stbi__create_png_image_raw(a, image_data, image_data_len, out_n, a->s->img_x, a->s->img_y, depth, color); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4001 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4002 // de-interlacing |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4003 final = (Uint8 *) stbi__malloc(a->s->img_x * a->s->img_y * out_n); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4004 for (p=0; p < 7; ++p) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4005 int xorig[] = { 0,4,0,2,0,1,0 }; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4006 int yorig[] = { 0,0,4,0,2,0,1 }; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4007 int xspc[] = { 8,8,4,4,2,2,1 }; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4008 int yspc[] = { 8,8,8,4,4,2,2 }; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4009 int i,j,x,y; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4010 // pass1_x[4] = 0, pass1_x[5] = 1, pass1_x[12] = 1 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4011 x = (a->s->img_x - xorig[p] + xspc[p]-1) / xspc[p]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4012 y = (a->s->img_y - yorig[p] + yspc[p]-1) / yspc[p]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4013 if (x && y) { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4014 Uint32 img_len = ((((a->s->img_n * x * depth) + 7) >> 3) + 1) * y; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4015 if (!stbi__create_png_image_raw(a, image_data, image_data_len, out_n, x, y, depth, color)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4016 STBI_FREE(final); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4017 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4018 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4019 for (j=0; j < y; ++j) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4020 for (i=0; i < x; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4021 int out_y = j*yspc[p]+yorig[p]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4022 int out_x = i*xspc[p]+xorig[p]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4023 memcpy(final + out_y*a->s->img_x*out_n + out_x*out_n, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4024 a->out + (j*x+i)*out_n, out_n); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4025 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4026 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4027 STBI_FREE(a->out); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4028 image_data += img_len; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4029 image_data_len -= img_len; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4030 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4031 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4032 a->out = final; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4033 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4034 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4035 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4036 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4037 static int stbi__compute_transparency(stbi__png *z, Uint8 tc[3], int out_n) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4038 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4039 stbi__context *s = z->s; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4040 Uint32 i, pixel_count = s->img_x * s->img_y; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4041 Uint8 *p = z->out; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4042 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4043 // compute color-based transparency, assuming we've |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4044 // already got 255 as the alpha value in the output |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4045 STBI_ASSERT(out_n == 2 || out_n == 4); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4046 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4047 if (out_n == 2) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4048 for (i=0; i < pixel_count; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4049 p[1] = (p[0] == tc[0] ? 0 : 255); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4050 p += 2; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4051 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4052 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4053 for (i=0; i < pixel_count; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4054 if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2]) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4055 p[3] = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4056 p += 4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4057 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4058 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4059 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4060 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4061 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4062 static int stbi__expand_png_palette(stbi__png *a, Uint8 *palette, int len, int pal_img_n) |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4063 { |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4064 Uint32 i, pixel_count = a->s->img_x * a->s->img_y; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4065 Uint8 *p, *temp_out, *orig = a->out; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4066 |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4067 p = (Uint8 *) stbi__malloc(pixel_count * pal_img_n); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4068 if (p == NULL) return stbi__err("outofmem", "Out of memory"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4069 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4070 // between here and free(out) below, exitting would leak |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4071 temp_out = p; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4072 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4073 if (pal_img_n == 3) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4074 for (i=0; i < pixel_count; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4075 int n = orig[i]*4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4076 p[0] = palette[n ]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4077 p[1] = palette[n+1]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4078 p[2] = palette[n+2]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4079 p += 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4080 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4081 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4082 for (i=0; i < pixel_count; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4083 int n = orig[i]*4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4084 p[0] = palette[n ]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4085 p[1] = palette[n+1]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4086 p[2] = palette[n+2]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4087 p[3] = palette[n+3]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4088 p += 4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4089 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4090 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4091 STBI_FREE(a->out); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4092 a->out = temp_out; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4093 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4094 STBI_NOTUSED(len); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4095 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4096 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4097 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4098 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4099 static int stbi__unpremultiply_on_load = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4100 static int stbi__de_iphone_flag = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4101 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4102 STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4103 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4104 stbi__unpremultiply_on_load = flag_true_if_should_unpremultiply; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4105 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4106 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4107 STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4108 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4109 stbi__de_iphone_flag = flag_true_if_should_convert; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4110 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4111 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4112 static void stbi__de_iphone(stbi__png *z) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4113 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4114 stbi__context *s = z->s; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4115 Uint32 i, pixel_count = s->img_x * s->img_y; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4116 Uint8 *p = z->out; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4117 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4118 if (s->img_out_n == 3) { // convert bgr to rgb |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4119 for (i=0; i < pixel_count; ++i) { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4120 Uint8 t = p[0]; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4121 p[0] = p[2]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4122 p[2] = t; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4123 p += 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4124 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4125 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4126 STBI_ASSERT(s->img_out_n == 4); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4127 if (stbi__unpremultiply_on_load) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4128 // convert bgr to rgb and unpremultiply |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4129 for (i=0; i < pixel_count; ++i) { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4130 Uint8 a = p[3]; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4131 Uint8 t = p[0]; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4132 if (a) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4133 p[0] = p[2] * 255 / a; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4134 p[1] = p[1] * 255 / a; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4135 p[2] = t * 255 / a; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4136 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4137 p[0] = p[2]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4138 p[2] = t; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4139 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4140 p += 4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4141 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4142 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4143 // convert bgr to rgb |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4144 for (i=0; i < pixel_count; ++i) { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4145 Uint8 t = p[0]; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4146 p[0] = p[2]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4147 p[2] = t; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4148 p += 4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4149 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4150 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4151 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4152 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4153 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4154 #define STBI__PNG_TYPE(a,b,c,d) (((a) << 24) + ((b) << 16) + ((c) << 8) + (d)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4155 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4156 static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4157 { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4158 Uint8 palette[1024], pal_img_n=0; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4159 Uint8 has_trans=0, tc[3]; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4160 Uint32 ioff=0, idata_limit=0, i, pal_len=0; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4161 int first=1,k,interlace=0, color=0, depth=0, is_iphone=0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4162 stbi__context *s = z->s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4163 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4164 z->expanded = NULL; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4165 z->idata = NULL; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4166 z->out = NULL; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4167 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4168 if (!stbi__check_png_header(s)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4169 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4170 if (scan == STBI__SCAN_type) return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4171 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4172 for (;;) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4173 stbi__pngchunk c = stbi__get_chunk_header(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4174 switch (c.type) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4175 case STBI__PNG_TYPE('C','g','B','I'): |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4176 is_iphone = 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4177 stbi__skip(s, c.length); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4178 break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4179 case STBI__PNG_TYPE('I','H','D','R'): { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4180 int comp,filter; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4181 if (!first) return stbi__err("multiple IHDR","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4182 first = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4183 if (c.length != 13) return stbi__err("bad IHDR len","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4184 s->img_x = stbi__get32be(s); if (s->img_x > (1 << 24)) return stbi__err("too large","Very large image (corrupt?)"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4185 s->img_y = stbi__get32be(s); if (s->img_y > (1 << 24)) return stbi__err("too large","Very large image (corrupt?)"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4186 depth = stbi__get8(s); if (depth != 1 && depth != 2 && depth != 4 && depth != 8) return stbi__err("1/2/4/8-bit only","PNG not supported: 1/2/4/8-bit only"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4187 color = stbi__get8(s); if (color > 6) return stbi__err("bad ctype","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4188 if (color == 3) pal_img_n = 3; else if (color & 1) return stbi__err("bad ctype","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4189 comp = stbi__get8(s); if (comp) return stbi__err("bad comp method","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4190 filter= stbi__get8(s); if (filter) return stbi__err("bad filter method","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4191 interlace = stbi__get8(s); if (interlace>1) return stbi__err("bad interlace method","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4192 if (!s->img_x || !s->img_y) return stbi__err("0-pixel image","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4193 if (!pal_img_n) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4194 s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4195 if ((1 << 30) / s->img_x / s->img_n < s->img_y) return stbi__err("too large", "Image too large to decode"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4196 if (scan == STBI__SCAN_header) return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4197 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4198 // if paletted, then pal_n is our final components, and |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4199 // img_n is # components to decompress/filter. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4200 s->img_n = 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4201 if ((1 << 30) / s->img_x / 4 < s->img_y) return stbi__err("too large","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4202 // if SCAN_header, have to scan to see if we have a tRNS |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4203 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4204 break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4205 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4206 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4207 case STBI__PNG_TYPE('P','L','T','E'): { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4208 if (first) return stbi__err("first not IHDR", "Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4209 if (c.length > 256*3) return stbi__err("invalid PLTE","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4210 pal_len = c.length / 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4211 if (pal_len * 3 != c.length) return stbi__err("invalid PLTE","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4212 for (i=0; i < pal_len; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4213 palette[i*4+0] = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4214 palette[i*4+1] = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4215 palette[i*4+2] = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4216 palette[i*4+3] = 255; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4217 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4218 break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4219 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4220 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4221 case STBI__PNG_TYPE('t','R','N','S'): { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4222 if (first) return stbi__err("first not IHDR", "Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4223 if (z->idata) return stbi__err("tRNS after IDAT","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4224 if (pal_img_n) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4225 if (scan == STBI__SCAN_header) { s->img_n = 4; return 1; } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4226 if (pal_len == 0) return stbi__err("tRNS before PLTE","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4227 if (c.length > pal_len) return stbi__err("bad tRNS len","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4228 pal_img_n = 4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4229 for (i=0; i < c.length; ++i) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4230 palette[i*4+3] = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4231 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4232 if (!(s->img_n & 1)) return stbi__err("tRNS with alpha","Corrupt PNG"); |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4233 if (c.length != (Uint32) s->img_n*2) return stbi__err("bad tRNS len","Corrupt PNG"); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4234 has_trans = 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4235 for (k=0; k < s->img_n; ++k) |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4236 tc[k] = (Uint8) (stbi__get16be(s) & 255) * stbi__depth_scale_table[depth]; // non 8-bit images will be larger |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4237 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4238 break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4239 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4240 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4241 case STBI__PNG_TYPE('I','D','A','T'): { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4242 if (first) return stbi__err("first not IHDR", "Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4243 if (pal_img_n && !pal_len) return stbi__err("no PLTE","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4244 if (scan == STBI__SCAN_header) { s->img_n = pal_img_n; return 1; } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4245 if (ioff + c.length > idata_limit) { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4246 Uint8 *p; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4247 if (idata_limit == 0) idata_limit = c.length > 4096 ? c.length : 4096; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4248 while (ioff + c.length > idata_limit) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4249 idata_limit *= 2; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4250 p = (Uint8 *) STBI_REALLOC(z->idata, idata_limit); if (p == NULL) return stbi__err("outofmem", "Out of memory"); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4251 z->idata = p; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4252 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4253 if (!stbi__getn(s, z->idata+ioff,c.length)) return stbi__err("outofdata","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4254 ioff += c.length; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4255 break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4256 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4257 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4258 case STBI__PNG_TYPE('I','E','N','D'): { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4259 Uint32 raw_len, bpl; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4260 if (first) return stbi__err("first not IHDR", "Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4261 if (scan != STBI__SCAN_load) return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4262 if (z->idata == NULL) return stbi__err("no IDAT","Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4263 // initial guess for decoded data size to avoid unnecessary reallocs |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4264 bpl = (s->img_x * depth + 7) / 8; // bytes per line, per component |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4265 raw_len = bpl * s->img_y * s->img_n /* pixels */ + s->img_y /* filter mode per row */; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4266 #ifdef STBI_INTERNAL_ZLIB |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4267 z->expanded = (Uint8 *) stbi_zlib_decode_malloc_guesssize_headerflag((char *) z->idata, ioff, raw_len, (int *) &raw_len, !is_iphone); |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4268 #else |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4269 # error NOT IMPLEMENTED! |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4270 #endif |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4271 if (z->expanded == NULL) return 0; // zlib should set error |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4272 STBI_FREE(z->idata); z->idata = NULL; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4273 if ((req_comp == s->img_n+1 && req_comp != 3 && !pal_img_n) || has_trans) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4274 s->img_out_n = s->img_n+1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4275 else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4276 s->img_out_n = s->img_n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4277 if (!stbi__create_png_image(z, z->expanded, raw_len, s->img_out_n, depth, color, interlace)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4278 if (has_trans) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4279 if (!stbi__compute_transparency(z, tc, s->img_out_n)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4280 if (is_iphone && stbi__de_iphone_flag && s->img_out_n > 2) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4281 stbi__de_iphone(z); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4282 if (pal_img_n) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4283 // pal_img_n == 3 or 4 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4284 s->img_n = pal_img_n; // record the actual colors we had |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4285 s->img_out_n = pal_img_n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4286 if (req_comp >= 3) s->img_out_n = req_comp; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4287 if (!stbi__expand_png_palette(z, palette, pal_len, s->img_out_n)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4288 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4289 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4290 STBI_FREE(z->expanded); z->expanded = NULL; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4291 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4292 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4293 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4294 default: |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4295 // if critical, fail |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4296 if (first) return stbi__err("first not IHDR", "Corrupt PNG"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4297 if ((c.type & (1 << 29)) == 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4298 #ifndef STBI_NO_FAILURE_STRINGS |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4299 // not threadsafe |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4300 static char invalid_chunk[] = "XXXX PNG chunk not known"; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4301 invalid_chunk[0] = STBI__BYTECAST(c.type >> 24); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4302 invalid_chunk[1] = STBI__BYTECAST(c.type >> 16); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4303 invalid_chunk[2] = STBI__BYTECAST(c.type >> 8); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4304 invalid_chunk[3] = STBI__BYTECAST(c.type >> 0); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4305 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4306 return stbi__err(invalid_chunk, "PNG not supported: unknown PNG chunk type"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4307 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4308 stbi__skip(s, c.length); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4309 break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4310 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4311 // end of PNG chunk, read and skip CRC |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4312 stbi__get32be(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4313 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4314 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4315 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4316 static unsigned char *stbi__do_png(stbi__png *p, int *x, int *y, int *n, int req_comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4317 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4318 unsigned char *result=NULL; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4319 if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4320 if (stbi__parse_png_file(p, STBI__SCAN_load, req_comp)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4321 result = p->out; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4322 p->out = NULL; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4323 if (req_comp && req_comp != p->s->img_out_n) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4324 result = stbi__convert_format(result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4325 p->s->img_out_n = req_comp; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4326 if (result == NULL) return result; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4327 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4328 *x = p->s->img_x; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4329 *y = p->s->img_y; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4330 if (n) *n = p->s->img_out_n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4331 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4332 STBI_FREE(p->out); p->out = NULL; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4333 STBI_FREE(p->expanded); p->expanded = NULL; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4334 STBI_FREE(p->idata); p->idata = NULL; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4335 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4336 return result; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4337 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4338 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4339 static unsigned char *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4340 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4341 stbi__png p; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4342 p.s = s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4343 return stbi__do_png(&p, x,y,comp,req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4344 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4345 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4346 static int stbi__png_test(stbi__context *s) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4347 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4348 int r; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4349 r = stbi__check_png_header(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4350 stbi__rewind(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4351 return r; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4352 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4353 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4354 static int stbi__png_info_raw(stbi__png *p, int *x, int *y, int *comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4355 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4356 if (!stbi__parse_png_file(p, STBI__SCAN_header, 0)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4357 stbi__rewind( p->s ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4358 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4359 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4360 if (x) *x = p->s->img_x; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4361 if (y) *y = p->s->img_y; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4362 if (comp) *comp = p->s->img_n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4363 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4364 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4365 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4366 static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4367 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4368 stbi__png p; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4369 p.s = s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4370 return stbi__png_info_raw(&p, x, y, comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4371 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4372 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4373 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4374 // Microsoft/Windows BMP image |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4375 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4376 #ifndef STBI_NO_BMP |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4377 static int stbi__bmp_test_raw(stbi__context *s) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4378 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4379 int r; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4380 int sz; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4381 if (stbi__get8(s) != 'B') return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4382 if (stbi__get8(s) != 'M') return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4383 stbi__get32le(s); // discard filesize |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4384 stbi__get16le(s); // discard reserved |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4385 stbi__get16le(s); // discard reserved |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4386 stbi__get32le(s); // discard data offset |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4387 sz = stbi__get32le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4388 r = (sz == 12 || sz == 40 || sz == 56 || sz == 108 || sz == 124); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4389 return r; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4390 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4391 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4392 static int stbi__bmp_test(stbi__context *s) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4393 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4394 int r = stbi__bmp_test_raw(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4395 stbi__rewind(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4396 return r; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4397 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4398 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4399 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4400 // returns 0..31 for the highest set bit |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4401 static int stbi__high_bit(unsigned int z) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4402 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4403 int n=0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4404 if (z == 0) return -1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4405 if (z >= 0x10000) n += 16, z >>= 16; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4406 if (z >= 0x00100) n += 8, z >>= 8; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4407 if (z >= 0x00010) n += 4, z >>= 4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4408 if (z >= 0x00004) n += 2, z >>= 2; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4409 if (z >= 0x00002) n += 1, z >>= 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4410 return n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4411 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4412 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4413 static int stbi__bitcount(unsigned int a) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4414 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4415 a = (a & 0x55555555) + ((a >> 1) & 0x55555555); // max 2 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4416 a = (a & 0x33333333) + ((a >> 2) & 0x33333333); // max 4 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4417 a = (a + (a >> 4)) & 0x0f0f0f0f; // max 8 per 4, now 8 bits |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4418 a = (a + (a >> 8)); // max 16 per 8 bits |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4419 a = (a + (a >> 16)); // max 32 per 8 bits |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4420 return a & 0xff; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4421 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4422 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4423 static int stbi__shiftsigned(int v, int shift, int bits) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4424 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4425 int result; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4426 int z=0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4427 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4428 if (shift < 0) v <<= -shift; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4429 else v >>= shift; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4430 result = v; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4431 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4432 z = bits; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4433 while (z < 8) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4434 result += v >> z; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4435 z += bits; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4436 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4437 return result; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4438 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4439 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4440 static Uint8 *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp) |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4441 { |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4442 Uint8 *out; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4443 unsigned int mr=0,mg=0,mb=0,ma=0, fake_a=0; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4444 Uint8 pal[256][4]; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4445 int psize=0,i,j,compress=0,width; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4446 int bpp, flip_vertically, pad, target, offset, hsz; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4447 if (stbi__get8(s) != 'B' || stbi__get8(s) != 'M') return stbi__errpuc("not BMP", "Corrupt BMP"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4448 stbi__get32le(s); // discard filesize |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4449 stbi__get16le(s); // discard reserved |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4450 stbi__get16le(s); // discard reserved |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4451 offset = stbi__get32le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4452 hsz = stbi__get32le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4453 if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108 && hsz != 124) return stbi__errpuc("unknown BMP", "BMP type not supported: unknown"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4454 if (hsz == 12) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4455 s->img_x = stbi__get16le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4456 s->img_y = stbi__get16le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4457 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4458 s->img_x = stbi__get32le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4459 s->img_y = stbi__get32le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4460 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4461 if (stbi__get16le(s) != 1) return stbi__errpuc("bad BMP", "bad BMP"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4462 bpp = stbi__get16le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4463 if (bpp == 1) return stbi__errpuc("monochrome", "BMP type not supported: 1-bit"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4464 flip_vertically = ((int) s->img_y) > 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4465 s->img_y = abs((int) s->img_y); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4466 if (hsz == 12) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4467 if (bpp < 24) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4468 psize = (offset - 14 - 24) / 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4469 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4470 compress = stbi__get32le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4471 if (compress == 1 || compress == 2) return stbi__errpuc("BMP RLE", "BMP type not supported: RLE"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4472 stbi__get32le(s); // discard sizeof |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4473 stbi__get32le(s); // discard hres |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4474 stbi__get32le(s); // discard vres |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4475 stbi__get32le(s); // discard colorsused |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4476 stbi__get32le(s); // discard max important |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4477 if (hsz == 40 || hsz == 56) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4478 if (hsz == 56) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4479 stbi__get32le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4480 stbi__get32le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4481 stbi__get32le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4482 stbi__get32le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4483 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4484 if (bpp == 16 || bpp == 32) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4485 mr = mg = mb = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4486 if (compress == 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4487 if (bpp == 32) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4488 mr = 0xffu << 16; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4489 mg = 0xffu << 8; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4490 mb = 0xffu << 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4491 ma = 0xffu << 24; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4492 fake_a = 1; // @TODO: check for cases like alpha value is all 0 and switch it to 255 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4493 STBI_NOTUSED(fake_a); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4494 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4495 mr = 31u << 10; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4496 mg = 31u << 5; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4497 mb = 31u << 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4498 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4499 } else if (compress == 3) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4500 mr = stbi__get32le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4501 mg = stbi__get32le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4502 mb = stbi__get32le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4503 // not documented, but generated by photoshop and handled by mspaint |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4504 if (mr == mg && mg == mb) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4505 // ?!?!? |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4506 return stbi__errpuc("bad BMP", "bad BMP"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4507 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4508 } else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4509 return stbi__errpuc("bad BMP", "bad BMP"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4510 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4511 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4512 STBI_ASSERT(hsz == 108 || hsz == 124); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4513 mr = stbi__get32le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4514 mg = stbi__get32le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4515 mb = stbi__get32le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4516 ma = stbi__get32le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4517 stbi__get32le(s); // discard color space |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4518 for (i=0; i < 12; ++i) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4519 stbi__get32le(s); // discard color space parameters |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4520 if (hsz == 124) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4521 stbi__get32le(s); // discard rendering intent |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4522 stbi__get32le(s); // discard offset of profile data |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4523 stbi__get32le(s); // discard size of profile data |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4524 stbi__get32le(s); // discard reserved |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4525 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4526 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4527 if (bpp < 16) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4528 psize = (offset - 14 - hsz) >> 2; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4529 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4530 s->img_n = ma ? 4 : 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4531 if (req_comp && req_comp >= 3) // we can directly decode 3 or 4 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4532 target = req_comp; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4533 else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4534 target = s->img_n; // if they want monochrome, we'll post-convert |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4535 out = (Uint8 *) stbi__malloc(target * s->img_x * s->img_y); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4536 if (!out) return stbi__errpuc("outofmem", "Out of memory"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4537 if (bpp < 16) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4538 int z=0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4539 if (psize == 0 || psize > 256) { STBI_FREE(out); return stbi__errpuc("invalid", "Corrupt BMP"); } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4540 for (i=0; i < psize; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4541 pal[i][2] = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4542 pal[i][1] = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4543 pal[i][0] = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4544 if (hsz != 12) stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4545 pal[i][3] = 255; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4546 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4547 stbi__skip(s, offset - 14 - hsz - psize * (hsz == 12 ? 3 : 4)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4548 if (bpp == 4) width = (s->img_x + 1) >> 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4549 else if (bpp == 8) width = s->img_x; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4550 else { STBI_FREE(out); return stbi__errpuc("bad bpp", "Corrupt BMP"); } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4551 pad = (-width)&3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4552 for (j=0; j < (int) s->img_y; ++j) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4553 for (i=0; i < (int) s->img_x; i += 2) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4554 int v=stbi__get8(s),v2=0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4555 if (bpp == 4) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4556 v2 = v & 15; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4557 v >>= 4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4558 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4559 out[z++] = pal[v][0]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4560 out[z++] = pal[v][1]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4561 out[z++] = pal[v][2]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4562 if (target == 4) out[z++] = 255; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4563 if (i+1 == (int) s->img_x) break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4564 v = (bpp == 8) ? stbi__get8(s) : v2; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4565 out[z++] = pal[v][0]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4566 out[z++] = pal[v][1]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4567 out[z++] = pal[v][2]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4568 if (target == 4) out[z++] = 255; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4569 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4570 stbi__skip(s, pad); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4571 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4572 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4573 int rshift=0,gshift=0,bshift=0,ashift=0,rcount=0,gcount=0,bcount=0,acount=0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4574 int z = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4575 int easy=0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4576 stbi__skip(s, offset - 14 - hsz); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4577 if (bpp == 24) width = 3 * s->img_x; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4578 else if (bpp == 16) width = 2*s->img_x; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4579 else /* bpp = 32 and pad = 0 */ width=0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4580 pad = (-width) & 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4581 if (bpp == 24) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4582 easy = 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4583 } else if (bpp == 32) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4584 if (mb == 0xff && mg == 0xff00 && mr == 0x00ff0000 && ma == 0xff000000) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4585 easy = 2; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4586 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4587 if (!easy) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4588 if (!mr || !mg || !mb) { STBI_FREE(out); return stbi__errpuc("bad masks", "Corrupt BMP"); } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4589 // right shift amt to put high bit in position #7 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4590 rshift = stbi__high_bit(mr)-7; rcount = stbi__bitcount(mr); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4591 gshift = stbi__high_bit(mg)-7; gcount = stbi__bitcount(mg); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4592 bshift = stbi__high_bit(mb)-7; bcount = stbi__bitcount(mb); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4593 ashift = stbi__high_bit(ma)-7; acount = stbi__bitcount(ma); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4594 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4595 for (j=0; j < (int) s->img_y; ++j) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4596 if (easy) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4597 for (i=0; i < (int) s->img_x; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4598 unsigned char a; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4599 out[z+2] = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4600 out[z+1] = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4601 out[z+0] = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4602 z += 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4603 a = (easy == 2 ? stbi__get8(s) : 255); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4604 if (target == 4) out[z++] = a; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4605 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4606 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4607 for (i=0; i < (int) s->img_x; ++i) { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4608 Uint32 v = (Uint32) (bpp == 16 ? (Uint16) stbi__get16le(s) : stbi__get32le(s)); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4609 int a; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4610 out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mr, rshift, rcount)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4611 out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mg, gshift, gcount)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4612 out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mb, bshift, bcount)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4613 a = (ma ? stbi__shiftsigned(v & ma, ashift, acount) : 255); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4614 if (target == 4) out[z++] = STBI__BYTECAST(a); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4615 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4616 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4617 stbi__skip(s, pad); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4618 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4619 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4620 if (flip_vertically) { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4621 Uint8 t; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4622 for (j=0; j < (int) s->img_y>>1; ++j) { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4623 Uint8 *p1 = out + j *s->img_x*target; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4624 Uint8 *p2 = out + (s->img_y-1-j)*s->img_x*target; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4625 for (i=0; i < (int) s->img_x*target; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4626 t = p1[i], p1[i] = p2[i], p2[i] = t; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4627 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4628 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4629 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4630 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4631 if (req_comp && req_comp != target) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4632 out = stbi__convert_format(out, target, req_comp, s->img_x, s->img_y); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4633 if (out == NULL) return out; // stbi__convert_format frees input on failure |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4634 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4635 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4636 *x = s->img_x; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4637 *y = s->img_y; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4638 if (comp) *comp = s->img_n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4639 return out; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4640 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4641 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4642 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4643 // Targa Truevision - TGA |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4644 // by Jonathan Dummer |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4645 #ifndef STBI_NO_TGA |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4646 static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4647 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4648 int tga_w, tga_h, tga_comp; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4649 int sz; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4650 stbi__get8(s); // discard Offset |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4651 sz = stbi__get8(s); // color type |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4652 if( sz > 1 ) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4653 stbi__rewind(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4654 return 0; // only RGB or indexed allowed |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4655 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4656 sz = stbi__get8(s); // image type |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4657 // only RGB or grey allowed, +/- RLE |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4658 if ((sz != 1) && (sz != 2) && (sz != 3) && (sz != 9) && (sz != 10) && (sz != 11)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4659 stbi__skip(s,9); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4660 tga_w = stbi__get16le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4661 if( tga_w < 1 ) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4662 stbi__rewind(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4663 return 0; // test width |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4664 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4665 tga_h = stbi__get16le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4666 if( tga_h < 1 ) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4667 stbi__rewind(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4668 return 0; // test height |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4669 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4670 sz = stbi__get8(s); // bits per pixel |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4671 // only RGB or RGBA or grey allowed |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4672 if ((sz != 8) && (sz != 16) && (sz != 24) && (sz != 32)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4673 stbi__rewind(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4674 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4675 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4676 tga_comp = sz; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4677 if (x) *x = tga_w; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4678 if (y) *y = tga_h; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4679 if (comp) *comp = tga_comp / 8; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4680 return 1; // seems to have passed everything |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4681 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4682 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4683 static int stbi__tga_test(stbi__context *s) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4684 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4685 int res; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4686 int sz; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4687 stbi__get8(s); // discard Offset |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4688 sz = stbi__get8(s); // color type |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4689 if ( sz > 1 ) return 0; // only RGB or indexed allowed |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4690 sz = stbi__get8(s); // image type |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4691 if ( (sz != 1) && (sz != 2) && (sz != 3) && (sz != 9) && (sz != 10) && (sz != 11) ) return 0; // only RGB or grey allowed, +/- RLE |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4692 stbi__get16be(s); // discard palette start |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4693 stbi__get16be(s); // discard palette length |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4694 stbi__get8(s); // discard bits per palette color entry |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4695 stbi__get16be(s); // discard x origin |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4696 stbi__get16be(s); // discard y origin |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4697 if ( stbi__get16be(s) < 1 ) return 0; // test width |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4698 if ( stbi__get16be(s) < 1 ) return 0; // test height |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4699 sz = stbi__get8(s); // bits per pixel |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4700 if ( (sz != 8) && (sz != 16) && (sz != 24) && (sz != 32) ) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4701 res = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4702 else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4703 res = 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4704 stbi__rewind(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4705 return res; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4706 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4707 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4708 static Uint8 *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4709 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4710 // read in the TGA header stuff |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4711 int tga_offset = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4712 int tga_indexed = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4713 int tga_image_type = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4714 int tga_is_RLE = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4715 int tga_palette_start = stbi__get16le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4716 int tga_palette_len = stbi__get16le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4717 int tga_palette_bits = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4718 int tga_x_origin = stbi__get16le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4719 int tga_y_origin = stbi__get16le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4720 int tga_width = stbi__get16le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4721 int tga_height = stbi__get16le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4722 int tga_bits_per_pixel = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4723 int tga_comp = tga_bits_per_pixel / 8; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4724 int tga_inverted = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4725 // image data |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4726 unsigned char *tga_data; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4727 unsigned char *tga_palette = NULL; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4728 int i, j; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4729 unsigned char raw_data[4]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4730 int RLE_count = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4731 int RLE_repeating = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4732 int read_next_pixel = 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4733 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4734 // do a tiny bit of precessing |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4735 if ( tga_image_type >= 8 ) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4736 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4737 tga_image_type -= 8; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4738 tga_is_RLE = 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4739 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4740 /* int tga_alpha_bits = tga_inverted & 15; */ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4741 tga_inverted = 1 - ((tga_inverted >> 5) & 1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4742 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4743 // error check |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4744 if ( //(tga_indexed) || |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4745 (tga_width < 1) || (tga_height < 1) || |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4746 (tga_image_type < 1) || (tga_image_type > 3) || |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4747 ((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16) && |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4748 (tga_bits_per_pixel != 24) && (tga_bits_per_pixel != 32)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4749 ) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4750 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4751 return NULL; // we don't report this as a bad TGA because we don't even know if it's TGA |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4752 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4753 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4754 // If I'm paletted, then I'll use the number of bits from the palette |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4755 if ( tga_indexed ) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4756 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4757 tga_comp = tga_palette_bits / 8; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4758 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4759 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4760 // tga info |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4761 *x = tga_width; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4762 *y = tga_height; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4763 if (comp) *comp = tga_comp; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4764 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4765 tga_data = (unsigned char*)stbi__malloc( tga_width * tga_height * tga_comp ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4766 if (!tga_data) return stbi__errpuc("outofmem", "Out of memory"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4767 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4768 // skip to the data's starting position (offset usually = 0) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4769 stbi__skip(s, tga_offset ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4770 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4771 if ( !tga_indexed && !tga_is_RLE) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4772 for (i=0; i < tga_height; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4773 int y = tga_inverted ? tga_height -i - 1 : i; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4774 Uint8 *tga_row = tga_data + y*tga_width*tga_comp; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4775 stbi__getn(s, tga_row, tga_width * tga_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4776 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4777 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4778 // do I need to load a palette? |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4779 if ( tga_indexed) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4780 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4781 // any data to skip? (offset usually = 0) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4782 stbi__skip(s, tga_palette_start ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4783 // load the palette |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4784 tga_palette = (unsigned char*)stbi__malloc( tga_palette_len * tga_palette_bits / 8 ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4785 if (!tga_palette) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4786 STBI_FREE(tga_data); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4787 return stbi__errpuc("outofmem", "Out of memory"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4788 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4789 if (!stbi__getn(s, tga_palette, tga_palette_len * tga_palette_bits / 8 )) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4790 STBI_FREE(tga_data); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4791 STBI_FREE(tga_palette); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4792 return stbi__errpuc("bad palette", "Corrupt TGA"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4793 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4794 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4795 // load the data |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4796 for (i=0; i < tga_width * tga_height; ++i) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4797 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4798 // if I'm in RLE mode, do I need to get a RLE stbi__pngchunk? |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4799 if ( tga_is_RLE ) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4800 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4801 if ( RLE_count == 0 ) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4802 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4803 // yep, get the next byte as a RLE command |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4804 int RLE_cmd = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4805 RLE_count = 1 + (RLE_cmd & 127); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4806 RLE_repeating = RLE_cmd >> 7; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4807 read_next_pixel = 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4808 } else if ( !RLE_repeating ) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4809 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4810 read_next_pixel = 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4811 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4812 } else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4813 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4814 read_next_pixel = 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4815 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4816 // OK, if I need to read a pixel, do it now |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4817 if ( read_next_pixel ) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4818 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4819 // load however much data we did have |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4820 if ( tga_indexed ) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4821 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4822 // read in 1 byte, then perform the lookup |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4823 int pal_idx = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4824 if ( pal_idx >= tga_palette_len ) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4825 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4826 // invalid index |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4827 pal_idx = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4828 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4829 pal_idx *= tga_bits_per_pixel / 8; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4830 for (j = 0; j*8 < tga_bits_per_pixel; ++j) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4831 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4832 raw_data[j] = tga_palette[pal_idx+j]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4833 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4834 } else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4835 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4836 // read in the data raw |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4837 for (j = 0; j*8 < tga_bits_per_pixel; ++j) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4838 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4839 raw_data[j] = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4840 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4841 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4842 // clear the reading flag for the next pixel |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4843 read_next_pixel = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4844 } // end of reading a pixel |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4845 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4846 // copy data |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4847 for (j = 0; j < tga_comp; ++j) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4848 tga_data[i*tga_comp+j] = raw_data[j]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4849 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4850 // in case we're in RLE mode, keep counting down |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4851 --RLE_count; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4852 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4853 // do I need to invert the image? |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4854 if ( tga_inverted ) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4855 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4856 for (j = 0; j*2 < tga_height; ++j) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4857 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4858 int index1 = j * tga_width * tga_comp; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4859 int index2 = (tga_height - 1 - j) * tga_width * tga_comp; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4860 for (i = tga_width * tga_comp; i > 0; --i) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4861 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4862 unsigned char temp = tga_data[index1]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4863 tga_data[index1] = tga_data[index2]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4864 tga_data[index2] = temp; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4865 ++index1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4866 ++index2; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4867 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4868 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4869 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4870 // clear my palette, if I had one |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4871 if ( tga_palette != NULL ) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4872 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4873 STBI_FREE( tga_palette ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4874 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4875 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4876 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4877 // swap RGB |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4878 if (tga_comp >= 3) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4879 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4880 unsigned char* tga_pixel = tga_data; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4881 for (i=0; i < tga_width * tga_height; ++i) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4882 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4883 unsigned char temp = tga_pixel[0]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4884 tga_pixel[0] = tga_pixel[2]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4885 tga_pixel[2] = temp; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4886 tga_pixel += tga_comp; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4887 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4888 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4889 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4890 // convert to target component count |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4891 if (req_comp && req_comp != tga_comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4892 tga_data = stbi__convert_format(tga_data, tga_comp, req_comp, tga_width, tga_height); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4893 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4894 // the things I do to get rid of an error message, and yet keep |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4895 // Microsoft's C compilers happy... [8^( |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4896 tga_palette_start = tga_palette_len = tga_palette_bits = |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4897 tga_x_origin = tga_y_origin = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4898 // OK, done |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4899 return tga_data; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4900 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4901 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4902 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4903 // ************************************************************************************************* |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4904 // Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicolas Schulz, tweaked by STB |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4905 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4906 #ifndef STBI_NO_PSD |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4907 static int stbi__psd_test(stbi__context *s) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4908 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4909 int r = (stbi__get32be(s) == 0x38425053); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4910 stbi__rewind(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4911 return r; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4912 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4913 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4914 static Uint8 *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4915 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4916 int pixelCount; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4917 int channelCount, compression; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4918 int channel, i, count, len; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4919 int w,h; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4920 Uint8 *out; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4921 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4922 // Check identifier |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4923 if (stbi__get32be(s) != 0x38425053) // "8BPS" |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4924 return stbi__errpuc("not PSD", "Corrupt PSD image"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4925 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4926 // Check file type version. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4927 if (stbi__get16be(s) != 1) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4928 return stbi__errpuc("wrong version", "Unsupported version of PSD image"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4929 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4930 // Skip 6 reserved bytes. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4931 stbi__skip(s, 6 ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4932 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4933 // Read the number of channels (R, G, B, A, etc). |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4934 channelCount = stbi__get16be(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4935 if (channelCount < 0 || channelCount > 16) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4936 return stbi__errpuc("wrong channel count", "Unsupported number of channels in PSD image"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4937 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4938 // Read the rows and columns of the image. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4939 h = stbi__get32be(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4940 w = stbi__get32be(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4941 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4942 // Make sure the depth is 8 bits. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4943 if (stbi__get16be(s) != 8) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4944 return stbi__errpuc("unsupported bit depth", "PSD bit depth is not 8 bit"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4945 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4946 // Make sure the color mode is RGB. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4947 // Valid options are: |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4948 // 0: Bitmap |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4949 // 1: Grayscale |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4950 // 2: Indexed color |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4951 // 3: RGB color |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4952 // 4: CMYK color |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4953 // 7: Multichannel |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4954 // 8: Duotone |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4955 // 9: Lab color |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4956 if (stbi__get16be(s) != 3) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4957 return stbi__errpuc("wrong color format", "PSD is not in RGB color format"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4958 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4959 // Skip the Mode Data. (It's the palette for indexed color; other info for other modes.) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4960 stbi__skip(s,stbi__get32be(s) ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4961 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4962 // Skip the image resources. (resolution, pen tool paths, etc) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4963 stbi__skip(s, stbi__get32be(s) ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4964 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4965 // Skip the reserved data. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4966 stbi__skip(s, stbi__get32be(s) ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4967 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4968 // Find out if the data is compressed. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4969 // Known values: |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4970 // 0: no compression |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4971 // 1: RLE compressed |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4972 compression = stbi__get16be(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4973 if (compression > 1) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4974 return stbi__errpuc("bad compression", "PSD has an unknown compression format"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4975 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4976 // Create the destination image. |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
4977 out = (Uint8 *) stbi__malloc(4 * w*h); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4978 if (!out) return stbi__errpuc("outofmem", "Out of memory"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4979 pixelCount = w*h; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4980 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4981 // Initialize the data to zero. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4982 //memset( out, 0, pixelCount * 4 ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4983 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4984 // Finally, the image data. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4985 if (compression) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4986 // RLE as used by .PSD and .TIFF |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4987 // Loop until you get the number of unpacked bytes you are expecting: |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4988 // Read the next source byte into n. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4989 // If n is between 0 and 127 inclusive, copy the next n+1 bytes literally. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4990 // Else if n is between -127 and -1 inclusive, copy the next byte -n+1 times. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4991 // Else if n is 128, noop. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4992 // Endloop |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4993 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4994 // The RLE-compressed data is preceeded by a 2-byte data count for each row in the data, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4995 // which we're going to just skip. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4996 stbi__skip(s, h * channelCount * 2 ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4997 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4998 // Read the RLE data by channel. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
4999 for (channel = 0; channel < 4; channel++) { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5000 Uint8 *p; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5001 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5002 p = out+channel; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5003 if (channel >= channelCount) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5004 // Fill this channel with default data. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5005 for (i = 0; i < pixelCount; i++) *p = (channel == 3 ? 255 : 0), p += 4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5006 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5007 // Read the RLE data. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5008 count = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5009 while (count < pixelCount) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5010 len = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5011 if (len == 128) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5012 // No-op. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5013 } else if (len < 128) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5014 // Copy next len+1 bytes literally. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5015 len++; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5016 count += len; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5017 while (len) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5018 *p = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5019 p += 4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5020 len--; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5021 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5022 } else if (len > 128) { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5023 Uint8 val; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5024 // Next -len+1 bytes in the dest are replicated from next source byte. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5025 // (Interpret len as a negative 8-bit int.) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5026 len ^= 0x0FF; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5027 len += 2; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5028 val = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5029 count += len; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5030 while (len) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5031 *p = val; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5032 p += 4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5033 len--; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5034 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5035 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5036 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5037 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5038 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5039 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5040 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5041 // We're at the raw image data. It's each channel in order (Red, Green, Blue, Alpha, ...) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5042 // where each channel consists of an 8-bit value for each pixel in the image. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5043 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5044 // Read the data by channel. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5045 for (channel = 0; channel < 4; channel++) { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5046 Uint8 *p; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5047 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5048 p = out + channel; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5049 if (channel > channelCount) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5050 // Fill this channel with default data. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5051 for (i = 0; i < pixelCount; i++) *p = channel == 3 ? 255 : 0, p += 4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5052 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5053 // Read the data. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5054 for (i = 0; i < pixelCount; i++) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5055 *p = stbi__get8(s), p += 4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5056 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5057 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5058 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5059 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5060 if (req_comp && req_comp != 4) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5061 out = stbi__convert_format(out, 4, req_comp, w, h); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5062 if (out == NULL) return out; // stbi__convert_format frees input on failure |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5063 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5064 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5065 if (comp) *comp = channelCount; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5066 *y = h; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5067 *x = w; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5068 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5069 return out; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5070 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5071 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5072 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5073 // ************************************************************************************************* |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5074 // Softimage PIC loader |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5075 // by Tom Seddon |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5076 // |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5077 // See http://softimage.wiki.softimage.com/index.php/INFO:_PIC_file_format |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5078 // See http://ozviz.wasp.uwa.edu.au/~pbourke/dataformats/softimagepic/ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5079 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5080 #ifndef STBI_NO_PIC |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5081 static int stbi__pic_is4(stbi__context *s,const char *str) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5082 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5083 int i; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5084 for (i=0; i<4; ++i) |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5085 if (stbi__get8(s) != (Uint8)str[i]) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5086 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5087 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5088 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5089 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5090 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5091 static int stbi__pic_test_core(stbi__context *s) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5092 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5093 int i; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5094 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5095 if (!stbi__pic_is4(s,"\x53\x80\xF6\x34")) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5096 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5097 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5098 for(i=0;i<84;++i) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5099 stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5100 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5101 if (!stbi__pic_is4(s,"PICT")) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5102 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5103 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5104 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5105 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5106 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5107 typedef struct |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5108 { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5109 Uint8 size,type,channel; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5110 } stbi__pic_packet; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5111 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5112 static Uint8 *stbi__readval(stbi__context *s, int channel, Uint8 *dest) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5113 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5114 int mask=0x80, i; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5115 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5116 for (i=0; i<4; ++i, mask>>=1) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5117 if (channel & mask) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5118 if (stbi__at_eof(s)) return stbi__errpuc("bad file","PIC file too short"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5119 dest[i]=stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5120 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5121 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5122 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5123 return dest; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5124 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5125 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5126 static void stbi__copyval(int channel,Uint8 *dest,const Uint8 *src) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5127 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5128 int mask=0x80,i; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5129 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5130 for (i=0;i<4; ++i, mask>>=1) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5131 if (channel&mask) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5132 dest[i]=src[i]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5133 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5134 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5135 static Uint8 *stbi__pic_load_core(stbi__context *s,int width,int height,int *comp, Uint8 *result) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5136 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5137 int act_comp=0,num_packets=0,y,chained; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5138 stbi__pic_packet packets[10]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5139 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5140 // this will (should...) cater for even some bizarre stuff like having data |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5141 // for the same channel in multiple packets. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5142 do { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5143 stbi__pic_packet *packet; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5144 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5145 if (num_packets==sizeof(packets)/sizeof(packets[0])) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5146 return stbi__errpuc("bad format","too many packets"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5147 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5148 packet = &packets[num_packets++]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5149 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5150 chained = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5151 packet->size = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5152 packet->type = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5153 packet->channel = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5154 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5155 act_comp |= packet->channel; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5156 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5157 if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (reading packets)"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5158 if (packet->size != 8) return stbi__errpuc("bad format","packet isn't 8bpp"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5159 } while (chained); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5160 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5161 *comp = (act_comp & 0x10 ? 4 : 3); // has alpha channel? |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5162 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5163 for(y=0; y<height; ++y) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5164 int packet_idx; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5165 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5166 for(packet_idx=0; packet_idx < num_packets; ++packet_idx) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5167 stbi__pic_packet *packet = &packets[packet_idx]; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5168 Uint8 *dest = result+y*width*4; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5169 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5170 switch (packet->type) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5171 default: |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5172 return stbi__errpuc("bad format","packet has bad compression type"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5173 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5174 case 0: {//uncompressed |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5175 int x; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5176 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5177 for(x=0;x<width;++x, dest+=4) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5178 if (!stbi__readval(s,packet->channel,dest)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5179 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5180 break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5181 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5182 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5183 case 1://Pure RLE |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5184 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5185 int left=width, i; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5186 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5187 while (left>0) { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5188 Uint8 count,value[4]; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5189 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5190 count=stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5191 if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (pure read count)"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5192 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5193 if (count > left) |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5194 count = (Uint8) left; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5195 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5196 if (!stbi__readval(s,packet->channel,value)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5197 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5198 for(i=0; i<count; ++i,dest+=4) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5199 stbi__copyval(packet->channel,dest,value); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5200 left -= count; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5201 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5202 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5203 break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5204 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5205 case 2: {//Mixed RLE |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5206 int left=width; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5207 while (left>0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5208 int count = stbi__get8(s), i; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5209 if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (mixed read count)"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5210 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5211 if (count >= 128) { // Repeated |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5212 Uint8 value[4]; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5213 int i; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5214 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5215 if (count==128) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5216 count = stbi__get16be(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5217 else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5218 count -= 127; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5219 if (count > left) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5220 return stbi__errpuc("bad file","scanline overrun"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5221 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5222 if (!stbi__readval(s,packet->channel,value)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5223 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5224 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5225 for(i=0;i<count;++i, dest += 4) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5226 stbi__copyval(packet->channel,dest,value); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5227 } else { // Raw |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5228 ++count; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5229 if (count>left) return stbi__errpuc("bad file","scanline overrun"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5230 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5231 for(i=0;i<count;++i, dest+=4) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5232 if (!stbi__readval(s,packet->channel,dest)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5233 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5234 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5235 left-=count; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5236 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5237 break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5238 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5239 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5240 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5241 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5242 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5243 return result; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5244 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5245 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5246 static Uint8 *stbi__pic_load(stbi__context *s,int *px,int *py,int *comp,int req_comp) |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5247 { |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5248 Uint8 *result; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5249 int i, x,y; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5250 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5251 for (i=0; i<92; ++i) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5252 stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5253 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5254 x = stbi__get16be(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5255 y = stbi__get16be(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5256 if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (pic header)"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5257 if ((1 << 28) / x < y) return stbi__errpuc("too large", "Image too large to decode"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5258 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5259 stbi__get32be(s); //skip `ratio' |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5260 stbi__get16be(s); //skip `fields' |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5261 stbi__get16be(s); //skip `pad' |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5262 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5263 // intermediate buffer is RGBA |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5264 result = (Uint8 *) stbi__malloc(x*y*4); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5265 memset(result, 0xff, x*y*4); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5266 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5267 if (!stbi__pic_load_core(s,x,y,comp, result)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5268 STBI_FREE(result); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5269 result=0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5270 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5271 *px = x; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5272 *py = y; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5273 if (req_comp == 0) req_comp = *comp; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5274 result=stbi__convert_format(result,4,req_comp,x,y); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5275 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5276 return result; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5277 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5278 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5279 static int stbi__pic_test(stbi__context *s) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5280 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5281 int r = stbi__pic_test_core(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5282 stbi__rewind(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5283 return r; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5284 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5285 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5286 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5287 // ************************************************************************************************* |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5288 // GIF loader -- public domain by Jean-Marc Lienher -- simplified/shrunk by stb |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5289 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5290 #ifndef STBI_NO_GIF |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5291 typedef struct |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5292 { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5293 Sint16 prefix; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5294 Uint8 first; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5295 Uint8 suffix; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5296 } stbi__gif_lzw; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5297 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5298 typedef struct |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5299 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5300 int w,h; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5301 Uint8 *out; // output buffer (always 4 components) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5302 int flags, bgindex, ratio, transparent, eflags; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5303 Uint8 pal[256][4]; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5304 Uint8 lpal[256][4]; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5305 stbi__gif_lzw codes[4096]; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5306 Uint8 *color_table; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5307 int parse, step; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5308 int lflags; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5309 int start_x, start_y; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5310 int max_x, max_y; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5311 int cur_x, cur_y; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5312 int line_size; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5313 } stbi__gif; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5314 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5315 static int stbi__gif_test_raw(stbi__context *s) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5316 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5317 int sz; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5318 if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8') return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5319 sz = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5320 if (sz != '9' && sz != '7') return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5321 if (stbi__get8(s) != 'a') return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5322 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5323 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5324 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5325 static int stbi__gif_test(stbi__context *s) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5326 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5327 int r = stbi__gif_test_raw(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5328 stbi__rewind(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5329 return r; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5330 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5331 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5332 static void stbi__gif_parse_colortable(stbi__context *s, Uint8 pal[256][4], int num_entries, int transp) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5333 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5334 int i; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5335 for (i=0; i < num_entries; ++i) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5336 pal[i][2] = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5337 pal[i][1] = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5338 pal[i][0] = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5339 pal[i][3] = transp == i ? 0 : 255; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5340 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5341 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5342 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5343 static int stbi__gif_header(stbi__context *s, stbi__gif *g, int *comp, int is_info) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5344 { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5345 Uint8 version; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5346 if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8') |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5347 return stbi__err("not GIF", "Corrupt GIF"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5348 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5349 version = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5350 if (version != '7' && version != '9') return stbi__err("not GIF", "Corrupt GIF"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5351 if (stbi__get8(s) != 'a') return stbi__err("not GIF", "Corrupt GIF"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5352 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5353 stbi__g_failure_reason = ""; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5354 g->w = stbi__get16le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5355 g->h = stbi__get16le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5356 g->flags = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5357 g->bgindex = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5358 g->ratio = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5359 g->transparent = -1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5360 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5361 if (comp != 0) *comp = 4; // can't actually tell whether it's 3 or 4 until we parse the comments |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5362 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5363 if (is_info) return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5364 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5365 if (g->flags & 0x80) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5366 stbi__gif_parse_colortable(s,g->pal, 2 << (g->flags & 7), -1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5367 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5368 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5369 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5370 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5371 static int stbi__gif_info_raw(stbi__context *s, int *x, int *y, int *comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5372 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5373 stbi__gif g; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5374 if (!stbi__gif_header(s, &g, comp, 1)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5375 stbi__rewind( s ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5376 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5377 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5378 if (x) *x = g.w; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5379 if (y) *y = g.h; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5380 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5381 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5382 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5383 static void stbi__out_gif_code(stbi__gif *g, Uint16 code) |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5384 { |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5385 Uint8 *p, *c; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5386 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5387 // recurse to decode the prefixes, since the linked-list is backwards, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5388 // and working backwards through an interleaved image would be nasty |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5389 if (g->codes[code].prefix >= 0) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5390 stbi__out_gif_code(g, g->codes[code].prefix); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5391 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5392 if (g->cur_y >= g->max_y) return; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5393 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5394 p = &g->out[g->cur_x + g->cur_y]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5395 c = &g->color_table[g->codes[code].suffix * 4]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5396 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5397 if (c[3] >= 128) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5398 p[0] = c[2]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5399 p[1] = c[1]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5400 p[2] = c[0]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5401 p[3] = c[3]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5402 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5403 g->cur_x += 4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5404 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5405 if (g->cur_x >= g->max_x) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5406 g->cur_x = g->start_x; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5407 g->cur_y += g->step; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5408 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5409 while (g->cur_y >= g->max_y && g->parse > 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5410 g->step = (1 << g->parse) * g->line_size; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5411 g->cur_y = g->start_y + (g->step >> 1); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5412 --g->parse; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5413 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5414 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5415 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5416 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5417 static Uint8 *stbi__process_gif_raster(stbi__context *s, stbi__gif *g) |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5418 { |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5419 Uint8 lzw_cs; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5420 Sint32 len, code; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5421 Uint32 first; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5422 Sint32 codesize, codemask, avail, oldcode, bits, valid_bits, clear; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5423 stbi__gif_lzw *p; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5424 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5425 lzw_cs = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5426 clear = 1 << lzw_cs; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5427 first = 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5428 codesize = lzw_cs + 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5429 codemask = (1 << codesize) - 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5430 bits = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5431 valid_bits = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5432 for (code = 0; code < clear; code++) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5433 g->codes[code].prefix = -1; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5434 g->codes[code].first = (Uint8) code; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5435 g->codes[code].suffix = (Uint8) code; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5436 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5437 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5438 // support no starting clear code |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5439 avail = clear+2; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5440 oldcode = -1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5441 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5442 len = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5443 for(;;) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5444 if (valid_bits < codesize) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5445 if (len == 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5446 len = stbi__get8(s); // start new block |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5447 if (len == 0) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5448 return g->out; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5449 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5450 --len; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5451 bits |= (Sint32) stbi__get8(s) << valid_bits; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5452 valid_bits += 8; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5453 } else { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5454 Sint32 code = bits & codemask; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5455 bits >>= codesize; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5456 valid_bits -= codesize; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5457 // @OPTIMIZE: is there some way we can accelerate the non-clear path? |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5458 if (code == clear) { // clear code |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5459 codesize = lzw_cs + 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5460 codemask = (1 << codesize) - 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5461 avail = clear + 2; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5462 oldcode = -1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5463 first = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5464 } else if (code == clear + 1) { // end of stream code |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5465 stbi__skip(s, len); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5466 while ((len = stbi__get8(s)) > 0) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5467 stbi__skip(s,len); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5468 return g->out; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5469 } else if (code <= avail) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5470 if (first) return stbi__errpuc("no clear code", "Corrupt GIF"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5471 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5472 if (oldcode >= 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5473 p = &g->codes[avail++]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5474 if (avail > 4096) return stbi__errpuc("too many codes", "Corrupt GIF"); |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5475 p->prefix = (Sint16) oldcode; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5476 p->first = g->codes[oldcode].first; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5477 p->suffix = (code == avail) ? p->first : g->codes[code].first; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5478 } else if (code == avail) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5479 return stbi__errpuc("illegal code in raster", "Corrupt GIF"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5480 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5481 stbi__out_gif_code(g, (Uint16) code); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5482 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5483 if ((avail & codemask) == 0 && avail <= 0x0FFF) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5484 codesize++; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5485 codemask = (1 << codesize) - 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5486 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5487 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5488 oldcode = code; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5489 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5490 return stbi__errpuc("illegal code in raster", "Corrupt GIF"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5491 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5492 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5493 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5494 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5495 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5496 static void stbi__fill_gif_background(stbi__gif *g) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5497 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5498 int i; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5499 Uint8 *c = g->pal[g->bgindex]; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5500 // @OPTIMIZE: write a dword at a time |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5501 for (i = 0; i < g->w * g->h * 4; i += 4) { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5502 Uint8 *p = &g->out[i]; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5503 p[0] = c[2]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5504 p[1] = c[1]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5505 p[2] = c[0]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5506 p[3] = c[3]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5507 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5508 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5509 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5510 // this function is designed to support animated gifs, although stb_image doesn't support it |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5511 static Uint8 *stbi__gif_load_next(stbi__context *s, stbi__gif *g, int *comp, int req_comp) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5512 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5513 int i; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5514 Uint8 *old_out = 0; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5515 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5516 if (g->out == 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5517 if (!stbi__gif_header(s, g, comp,0)) return 0; // stbi__g_failure_reason set by stbi__gif_header |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5518 g->out = (Uint8 *) stbi__malloc(4 * g->w * g->h); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5519 if (g->out == 0) return stbi__errpuc("outofmem", "Out of memory"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5520 stbi__fill_gif_background(g); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5521 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5522 // animated-gif-only path |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5523 if (((g->eflags & 0x1C) >> 2) == 3) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5524 old_out = g->out; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5525 g->out = (Uint8 *) stbi__malloc(4 * g->w * g->h); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5526 if (g->out == 0) return stbi__errpuc("outofmem", "Out of memory"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5527 memcpy(g->out, old_out, g->w*g->h*4); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5528 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5529 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5530 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5531 for (;;) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5532 switch (stbi__get8(s)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5533 case 0x2C: /* Image Descriptor */ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5534 { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5535 Sint32 x, y, w, h; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5536 Uint8 *o; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5537 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5538 x = stbi__get16le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5539 y = stbi__get16le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5540 w = stbi__get16le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5541 h = stbi__get16le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5542 if (((x + w) > (g->w)) || ((y + h) > (g->h))) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5543 return stbi__errpuc("bad Image Descriptor", "Corrupt GIF"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5544 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5545 g->line_size = g->w * 4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5546 g->start_x = x * 4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5547 g->start_y = y * g->line_size; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5548 g->max_x = g->start_x + w * 4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5549 g->max_y = g->start_y + h * g->line_size; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5550 g->cur_x = g->start_x; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5551 g->cur_y = g->start_y; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5552 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5553 g->lflags = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5554 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5555 if (g->lflags & 0x40) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5556 g->step = 8 * g->line_size; // first interlaced spacing |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5557 g->parse = 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5558 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5559 g->step = g->line_size; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5560 g->parse = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5561 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5562 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5563 if (g->lflags & 0x80) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5564 stbi__gif_parse_colortable(s,g->lpal, 2 << (g->lflags & 7), g->eflags & 0x01 ? g->transparent : -1); |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5565 g->color_table = (Uint8 *) g->lpal; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5566 } else if (g->flags & 0x80) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5567 for (i=0; i < 256; ++i) // @OPTIMIZE: stbi__jpeg_reset only the previous transparent |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5568 g->pal[i][3] = 255; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5569 if (g->transparent >= 0 && (g->eflags & 0x01)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5570 g->pal[g->transparent][3] = 0; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5571 g->color_table = (Uint8 *) g->pal; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5572 } else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5573 return stbi__errpuc("missing color table", "Corrupt GIF"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5574 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5575 o = stbi__process_gif_raster(s, g); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5576 if (o == NULL) return NULL; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5577 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5578 if (req_comp && req_comp != 4) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5579 o = stbi__convert_format(o, 4, req_comp, g->w, g->h); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5580 return o; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5581 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5582 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5583 case 0x21: // Comment Extension. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5584 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5585 int len; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5586 if (stbi__get8(s) == 0xF9) { // Graphic Control Extension. |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5587 len = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5588 if (len == 4) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5589 g->eflags = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5590 stbi__get16le(s); // delay |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5591 g->transparent = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5592 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5593 stbi__skip(s, len); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5594 break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5595 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5596 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5597 while ((len = stbi__get8(s)) != 0) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5598 stbi__skip(s, len); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5599 break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5600 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5601 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5602 case 0x3B: // gif stream termination code |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5603 return (Uint8 *) s; // using '1' causes warning on some compilers |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5604 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5605 default: |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5606 return stbi__errpuc("unknown code", "Corrupt GIF"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5607 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5608 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5609 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5610 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5611 static Uint8 *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp) |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5612 { |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5613 Uint8 *u = 0; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5614 stbi__gif g; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5615 memset(&g, 0, sizeof(g)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5616 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5617 u = stbi__gif_load_next(s, &g, comp, req_comp); |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5618 if (u == (Uint8 *) s) u = 0; // end of animated gif marker |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5619 if (u) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5620 *x = g.w; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5621 *y = g.h; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5622 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5623 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5624 return u; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5625 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5626 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5627 static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5628 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5629 return stbi__gif_info_raw(s,x,y,comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5630 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5631 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5632 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5633 // ************************************************************************************************* |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5634 // Radiance RGBE HDR loader |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5635 // originally by Nicolas Schulz |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5636 #ifndef STBI_NO_HDR |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5637 static int stbi__hdr_test_core(stbi__context *s) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5638 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5639 const char *signature = "#?RADIANCE\n"; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5640 int i; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5641 for (i=0; signature[i]; ++i) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5642 if (stbi__get8(s) != signature[i]) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5643 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5644 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5645 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5646 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5647 static int stbi__hdr_test(stbi__context* s) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5648 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5649 int r = stbi__hdr_test_core(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5650 stbi__rewind(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5651 return r; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5652 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5653 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5654 #define STBI__HDR_BUFLEN 1024 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5655 static char *stbi__hdr_gettoken(stbi__context *z, char *buffer) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5656 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5657 int len=0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5658 char c = '\0'; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5659 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5660 c = (char) stbi__get8(z); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5661 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5662 while (!stbi__at_eof(z) && c != '\n') { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5663 buffer[len++] = c; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5664 if (len == STBI__HDR_BUFLEN-1) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5665 // flush to end of line |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5666 while (!stbi__at_eof(z) && stbi__get8(z) != '\n') |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5667 ; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5668 break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5669 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5670 c = (char) stbi__get8(z); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5671 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5672 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5673 buffer[len] = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5674 return buffer; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5675 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5676 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5677 static void stbi__hdr_convert(float *output, Uint8 *input, int req_comp) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5678 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5679 if ( input[3] != 0 ) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5680 float f1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5681 // Exponent |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5682 f1 = (float) ldexp(1.0f, input[3] - (int)(128 + 8)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5683 if (req_comp <= 2) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5684 output[0] = (input[0] + input[1] + input[2]) * f1 / 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5685 else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5686 output[0] = input[0] * f1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5687 output[1] = input[1] * f1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5688 output[2] = input[2] * f1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5689 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5690 if (req_comp == 2) output[1] = 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5691 if (req_comp == 4) output[3] = 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5692 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5693 switch (req_comp) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5694 case 4: output[3] = 1; /* fallthrough */ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5695 case 3: output[0] = output[1] = output[2] = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5696 break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5697 case 2: output[1] = 1; /* fallthrough */ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5698 case 1: output[0] = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5699 break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5700 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5701 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5702 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5703 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5704 static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5705 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5706 char buffer[STBI__HDR_BUFLEN]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5707 char *token; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5708 int valid = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5709 int width, height; |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5710 Uint8 *scanline; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5711 float *hdr_data; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5712 int len; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5713 unsigned char count, value; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5714 int i, j, k, c1,c2, z; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5715 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5716 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5717 // Check identifier |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5718 if (strcmp(stbi__hdr_gettoken(s,buffer), "#?RADIANCE") != 0) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5719 return stbi__errpf("not HDR", "Corrupt HDR image"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5720 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5721 // Parse header |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5722 for(;;) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5723 token = stbi__hdr_gettoken(s,buffer); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5724 if (token[0] == 0) break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5725 if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5726 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5727 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5728 if (!valid) return stbi__errpf("unsupported format", "Unsupported HDR format"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5729 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5730 // Parse width and height |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5731 // can't use sscanf() if we're not using stdio! |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5732 token = stbi__hdr_gettoken(s,buffer); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5733 if (strncmp(token, "-Y ", 3)) return stbi__errpf("unsupported data layout", "Unsupported HDR format"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5734 token += 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5735 height = (int) strtol(token, &token, 10); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5736 while (*token == ' ') ++token; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5737 if (strncmp(token, "+X ", 3)) return stbi__errpf("unsupported data layout", "Unsupported HDR format"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5738 token += 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5739 width = (int) strtol(token, NULL, 10); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5740 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5741 *x = width; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5742 *y = height; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5743 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5744 if (comp) *comp = 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5745 if (req_comp == 0) req_comp = 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5746 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5747 // Read data |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5748 hdr_data = (float *) stbi__malloc(height * width * req_comp * sizeof(float)); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5749 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5750 // Load image data |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5751 // image data is stored as some number of sca |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5752 if ( width < 8 || width >= 32768) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5753 // Read flat data |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5754 for (j=0; j < height; ++j) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5755 for (i=0; i < width; ++i) { |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5756 Uint8 rgbe[4]; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5757 main_decode_loop: |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5758 stbi__getn(s, rgbe, 4); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5759 stbi__hdr_convert(hdr_data + j * width * req_comp + i * req_comp, rgbe, req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5760 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5761 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5762 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5763 // Read RLE-encoded data |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5764 scanline = NULL; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5765 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5766 for (j = 0; j < height; ++j) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5767 c1 = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5768 c2 = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5769 len = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5770 if (c1 != 2 || c2 != 2 || (len & 0x80)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5771 // not run-length encoded, so we have to actually use THIS data as a decoded |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5772 // pixel (note this can't be a valid pixel--one of RGB must be >= 128) |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5773 Uint8 rgbe[4]; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5774 rgbe[0] = (Uint8) c1; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5775 rgbe[1] = (Uint8) c2; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5776 rgbe[2] = (Uint8) len; |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5777 rgbe[3] = (Uint8) stbi__get8(s); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5778 stbi__hdr_convert(hdr_data, rgbe, req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5779 i = 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5780 j = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5781 STBI_FREE(scanline); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5782 goto main_decode_loop; // yes, this makes no sense |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5783 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5784 len <<= 8; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5785 len |= stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5786 if (len != width) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("invalid decoded scanline length", "corrupt HDR"); } |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5787 if (scanline == NULL) scanline = (Uint8 *) stbi__malloc(width * 4); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5788 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5789 for (k = 0; k < 4; ++k) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5790 i = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5791 while (i < width) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5792 count = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5793 if (count > 128) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5794 // Run |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5795 value = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5796 count -= 128; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5797 for (z = 0; z < count; ++z) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5798 scanline[i++ * 4 + k] = value; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5799 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5800 // Dump |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5801 for (z = 0; z < count; ++z) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5802 scanline[i++ * 4 + k] = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5803 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5804 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5805 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5806 for (i=0; i < width; ++i) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5807 stbi__hdr_convert(hdr_data+(j*width + i)*req_comp, scanline + i*4, req_comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5808 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5809 STBI_FREE(scanline); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5810 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5811 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5812 return hdr_data; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5813 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5814 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5815 static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5816 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5817 char buffer[STBI__HDR_BUFLEN]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5818 char *token; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5819 int valid = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5820 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5821 if (strcmp(stbi__hdr_gettoken(s,buffer), "#?RADIANCE") != 0) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5822 stbi__rewind( s ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5823 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5824 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5825 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5826 for(;;) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5827 token = stbi__hdr_gettoken(s,buffer); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5828 if (token[0] == 0) break; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5829 if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5830 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5831 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5832 if (!valid) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5833 stbi__rewind( s ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5834 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5835 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5836 token = stbi__hdr_gettoken(s,buffer); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5837 if (strncmp(token, "-Y ", 3)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5838 stbi__rewind( s ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5839 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5840 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5841 token += 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5842 *y = (int) strtol(token, &token, 10); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5843 while (*token == ' ') ++token; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5844 if (strncmp(token, "+X ", 3)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5845 stbi__rewind( s ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5846 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5847 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5848 token += 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5849 *x = (int) strtol(token, NULL, 10); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5850 *comp = 3; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5851 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5852 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5853 #endif // STBI_NO_HDR |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5854 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5855 #ifndef STBI_NO_BMP |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5856 static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5857 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5858 int hsz; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5859 if (stbi__get8(s) != 'B' || stbi__get8(s) != 'M') { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5860 stbi__rewind( s ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5861 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5862 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5863 stbi__skip(s,12); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5864 hsz = stbi__get32le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5865 if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108 && hsz != 124) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5866 stbi__rewind( s ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5867 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5868 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5869 if (hsz == 12) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5870 *x = stbi__get16le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5871 *y = stbi__get16le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5872 } else { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5873 *x = stbi__get32le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5874 *y = stbi__get32le(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5875 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5876 if (stbi__get16le(s) != 1) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5877 stbi__rewind( s ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5878 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5879 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5880 *comp = stbi__get16le(s) / 8; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5881 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5882 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5883 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5884 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5885 #ifndef STBI_NO_PSD |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5886 static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5887 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5888 int channelCount; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5889 if (stbi__get32be(s) != 0x38425053) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5890 stbi__rewind( s ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5891 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5892 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5893 if (stbi__get16be(s) != 1) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5894 stbi__rewind( s ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5895 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5896 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5897 stbi__skip(s, 6); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5898 channelCount = stbi__get16be(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5899 if (channelCount < 0 || channelCount > 16) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5900 stbi__rewind( s ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5901 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5902 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5903 *y = stbi__get32be(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5904 *x = stbi__get32be(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5905 if (stbi__get16be(s) != 8) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5906 stbi__rewind( s ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5907 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5908 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5909 if (stbi__get16be(s) != 3) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5910 stbi__rewind( s ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5911 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5912 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5913 *comp = 4; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5914 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5915 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5916 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5917 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5918 #ifndef STBI_NO_PIC |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5919 static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5920 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5921 int act_comp=0,num_packets=0,chained; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5922 stbi__pic_packet packets[10]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5923 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5924 stbi__skip(s, 92); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5925 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5926 *x = stbi__get16be(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5927 *y = stbi__get16be(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5928 if (stbi__at_eof(s)) return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5929 if ( (*x) != 0 && (1 << 28) / (*x) < (*y)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5930 stbi__rewind( s ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5931 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5932 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5933 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5934 stbi__skip(s, 8); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5935 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5936 do { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5937 stbi__pic_packet *packet; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5938 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5939 if (num_packets==sizeof(packets)/sizeof(packets[0])) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5940 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5941 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5942 packet = &packets[num_packets++]; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5943 chained = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5944 packet->size = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5945 packet->type = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5946 packet->channel = stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5947 act_comp |= packet->channel; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5948 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5949 if (stbi__at_eof(s)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5950 stbi__rewind( s ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5951 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5952 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5953 if (packet->size != 8) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5954 stbi__rewind( s ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5955 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5956 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5957 } while (chained); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5958 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5959 *comp = (act_comp & 0x10 ? 4 : 3); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5960 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5961 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5962 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5963 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5964 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5965 // ************************************************************************************************* |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5966 // Portable Gray Map and Portable Pixel Map loader |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5967 // by Ken Miller |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5968 // |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5969 // PGM: http://netpbm.sourceforge.net/doc/pgm.html |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5970 // PPM: http://netpbm.sourceforge.net/doc/ppm.html |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5971 // |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5972 // Known limitations: |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5973 // Does not support comments in the header section |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5974 // Does not support ASCII image data (formats P2 and P3) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5975 // Does not support 16-bit-per-channel |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5976 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5977 #ifndef STBI_NO_PNM |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5978 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5979 static int stbi__pnm_test(stbi__context *s) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5980 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5981 char p, t; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5982 p = (char) stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5983 t = (char) stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5984 if (p != 'P' || (t != '5' && t != '6')) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5985 stbi__rewind( s ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5986 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5987 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5988 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5989 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5990 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5991 static Uint8 *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp) |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5992 { |
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
5993 Uint8 *out; |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5994 if (!stbi__pnm_info(s, (int *)&s->img_x, (int *)&s->img_y, (int *)&s->img_n)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5995 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5996 *x = s->img_x; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5997 *y = s->img_y; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5998 *comp = s->img_n; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
5999 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
6000 out = (Uint8 *) stbi__malloc(s->img_n * s->img_x * s->img_y); |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6001 if (!out) return stbi__errpuc("outofmem", "Out of memory"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6002 stbi__getn(s, out, s->img_n * s->img_x * s->img_y); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6003 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6004 if (req_comp && req_comp != s->img_n) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6005 out = stbi__convert_format(out, s->img_n, req_comp, s->img_x, s->img_y); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6006 if (out == NULL) return out; // stbi__convert_format frees input on failure |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6007 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6008 return out; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6009 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6010 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6011 static int stbi__pnm_isspace(char c) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6012 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6013 return c == ' ' || c == '\t' || c == '\n' || c == '\v' || c == '\f' || c == '\r'; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6014 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6015 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6016 static void stbi__pnm_skip_whitespace(stbi__context *s, char *c) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6017 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6018 while (!stbi__at_eof(s) && stbi__pnm_isspace(*c)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6019 *c = (char) stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6020 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6021 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6022 static int stbi__pnm_isdigit(char c) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6023 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6024 return c >= '0' && c <= '9'; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6025 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6026 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6027 static int stbi__pnm_getinteger(stbi__context *s, char *c) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6028 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6029 int value = 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6030 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6031 while (!stbi__at_eof(s) && stbi__pnm_isdigit(*c)) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6032 value = value*10 + (*c - '0'); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6033 *c = (char) stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6034 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6035 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6036 return value; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6037 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6038 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6039 static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6040 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6041 int maxv; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6042 char c, p, t; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6043 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6044 stbi__rewind( s ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6045 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6046 // Get identifier |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6047 p = (char) stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6048 t = (char) stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6049 if (p != 'P' || (t != '5' && t != '6')) { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6050 stbi__rewind( s ); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6051 return 0; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6052 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6053 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6054 *comp = (t == '6') ? 3 : 1; // '5' is 1-component .pgm; '6' is 3-component .ppm |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6055 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6056 c = (char) stbi__get8(s); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6057 stbi__pnm_skip_whitespace(s, &c); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6058 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6059 *x = stbi__pnm_getinteger(s, &c); // read width |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6060 stbi__pnm_skip_whitespace(s, &c); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6061 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6062 *y = stbi__pnm_getinteger(s, &c); // read height |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6063 stbi__pnm_skip_whitespace(s, &c); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6064 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6065 maxv = stbi__pnm_getinteger(s, &c); // read max value |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6066 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6067 if (maxv > 255) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6068 return stbi__err("max value > 255", "PPM image not 8-bit"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6069 else |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6070 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6071 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6072 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6073 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6074 static int stbi__info_main(stbi__context *s, int *x, int *y, int *comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6075 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6076 #ifndef STBI_NO_JPEG |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6077 if (stbi__jpeg_info(s, x, y, comp)) return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6078 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6079 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6080 #ifndef STBI_NO_PNG |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6081 if (stbi__png_info(s, x, y, comp)) return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6082 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6083 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6084 #ifndef STBI_NO_GIF |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6085 if (stbi__gif_info(s, x, y, comp)) return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6086 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6087 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6088 #ifndef STBI_NO_BMP |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6089 if (stbi__bmp_info(s, x, y, comp)) return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6090 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6091 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6092 #ifndef STBI_NO_PSD |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6093 if (stbi__psd_info(s, x, y, comp)) return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6094 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6095 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6096 #ifndef STBI_NO_PIC |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6097 if (stbi__pic_info(s, x, y, comp)) return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6098 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6099 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6100 #ifndef STBI_NO_PNM |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6101 if (stbi__pnm_info(s, x, y, comp)) return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6102 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6103 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6104 #ifndef STBI_NO_HDR |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6105 if (stbi__hdr_info(s, x, y, comp)) return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6106 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6107 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6108 // test tga last because it's a crappy test! |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6109 #ifndef STBI_NO_TGA |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6110 if (stbi__tga_info(s, x, y, comp)) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6111 return 1; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6112 #endif |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6113 return stbi__err("unknown image type", "Image not of any known type, or corrupt"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6114 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6115 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6116 #ifndef STBI_NO_STDIO |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6117 STBIDEF int stbi_info(char const *filename, int *x, int *y, int *comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6118 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6119 FILE *f = stbi__fopen(filename, "rb"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6120 int result; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6121 if (!f) return stbi__err("can't fopen", "Unable to open file"); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6122 result = stbi_info_from_file(f, x, y, comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6123 fclose(f); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6124 return result; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6125 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6126 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6127 STBIDEF int stbi_info_from_file(FILE *f, int *x, int *y, int *comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6128 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6129 int r; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6130 stbi__context s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6131 long pos = ftell(f); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6132 stbi__start_file(&s, f); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6133 r = stbi__info_main(&s,x,y,comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6134 fseek(f,pos,SEEK_SET); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6135 return r; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6136 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6137 #endif // !STBI_NO_STDIO |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6138 |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
6139 STBIDEF int stbi_info_from_memory(Uint8 const *buffer, int len, int *x, int *y, int *comp) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6140 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6141 stbi__context s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6142 stbi__start_mem(&s,buffer,len); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6143 return stbi__info_main(&s,x,y,comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6144 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6145 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6146 STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int *x, int *y, int *comp) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6147 { |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6148 stbi__context s; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6149 stbi__start_callbacks(&s, (stbi_io_callbacks *) c, user); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6150 return stbi__info_main(&s,x,y,comp); |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6151 } |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6152 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6153 #endif // STB_IMAGE_IMPLEMENTATION |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6154 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6155 /* |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6156 revision history: |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6157 2.02 (2015-01-19) fix incorrect assert, fix warning |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6158 2.01 (2015-01-17) fix various warnings; suppress SIMD on gcc 32-bit without -msse2 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6159 2.00b (2014-12-25) fix STBI_MALLOC in progressive JPEG |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6160 2.00 (2014-12-25) optimize JPG, including x86 SSE2 & NEON SIMD (ryg) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6161 progressive JPEG (stb) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6162 PGM/PPM support (Ken Miller) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6163 STBI_MALLOC,STBI_REALLOC,STBI_FREE |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6164 GIF bugfix -- seemingly never worked |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6165 STBI_NO_*, STBI_ONLY_* |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6166 1.48 (2014-12-14) fix incorrectly-named assert() |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6167 1.47 (2014-12-14) 1/2/4-bit PNG support, both direct and paletted (Omar Cornut & stb) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6168 optimize PNG (ryg) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6169 fix bug in interlaced PNG with user-specified channel count (stb) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6170 1.46 (2014-08-26) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6171 fix broken tRNS chunk (colorkey-style transparency) in non-paletted PNG |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6172 1.45 (2014-08-16) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6173 fix MSVC-ARM internal compiler error by wrapping malloc |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6174 1.44 (2014-08-07) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6175 various warning fixes from Ronny Chevalier |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6176 1.43 (2014-07-15) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6177 fix MSVC-only compiler problem in code changed in 1.42 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6178 1.42 (2014-07-09) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6179 don't define _CRT_SECURE_NO_WARNINGS (affects user code) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6180 fixes to stbi__cleanup_jpeg path |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6181 added STBI_ASSERT to avoid requiring assert.h |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6182 1.41 (2014-06-25) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6183 fix search&replace from 1.36 that messed up comments/error messages |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6184 1.40 (2014-06-22) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6185 fix gcc struct-initialization warning |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6186 1.39 (2014-06-15) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6187 fix to TGA optimization when req_comp != number of components in TGA; |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6188 fix to GIF loading because BMP wasn't rewinding (whoops, no GIFs in my test suite) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6189 add support for BMP version 5 (more ignored fields) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6190 1.38 (2014-06-06) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6191 suppress MSVC warnings on integer casts truncating values |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6192 fix accidental rename of 'skip' field of I/O |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6193 1.37 (2014-06-04) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6194 remove duplicate typedef |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6195 1.36 (2014-06-03) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6196 convert to header file single-file library |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6197 if de-iphone isn't set, load iphone images color-swapped instead of returning NULL |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6198 1.35 (2014-05-27) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6199 various warnings |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6200 fix broken STBI_SIMD path |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6201 fix bug where stbi_load_from_file no longer left file pointer in correct place |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6202 fix broken non-easy path for 32-bit BMP (possibly never used) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6203 TGA optimization by Arseny Kapoulkine |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6204 1.34 (unknown) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6205 use STBI_NOTUSED in stbi__resample_row_generic(), fix one more leak in tga failure case |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6206 1.33 (2011-07-14) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6207 make stbi_is_hdr work in STBI_NO_HDR (as specified), minor compiler-friendly improvements |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6208 1.32 (2011-07-13) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6209 support for "info" function for all supported filetypes (SpartanJ) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6210 1.31 (2011-06-20) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6211 a few more leak fixes, bug in PNG handling (SpartanJ) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6212 1.30 (2011-06-11) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6213 added ability to load files via callbacks to accomidate custom input streams (Ben Wenger) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6214 removed deprecated format-specific test/load functions |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6215 removed support for installable file formats (stbi_loader) -- would have been broken for IO callbacks anyway |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6216 error cases in bmp and tga give messages and don't leak (Raymond Barbiero, grisha) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6217 fix inefficiency in decoding 32-bit BMP (David Woo) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6218 1.29 (2010-08-16) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6219 various warning fixes from Aurelien Pocheville |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6220 1.28 (2010-08-01) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6221 fix bug in GIF palette transparency (SpartanJ) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6222 1.27 (2010-08-01) |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
6223 cast-to-Uint8 to fix warnings |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6224 1.26 (2010-07-24) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6225 fix bug in file buffering for PNG reported by SpartanJ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6226 1.25 (2010-07-17) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6227 refix trans_data warning (Won Chun) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6228 1.24 (2010-07-12) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6229 perf improvements reading from files on platforms with lock-heavy fgetc() |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6230 minor perf improvements for jpeg |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6231 deprecated type-specific functions so we'll get feedback if they're needed |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6232 attempt to fix trans_data warning (Won Chun) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6233 1.23 fixed bug in iPhone support |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6234 1.22 (2010-07-10) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6235 removed image *writing* support |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6236 stbi_info support from Jetro Lauha |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6237 GIF support from Jean-Marc Lienher |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6238 iPhone PNG-extensions from James Brown |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6239 warning-fixes from Nicolas Schulz and Janez Zemva (i.stbi__err. Janez (U+017D)emva) |
899
63fd1801f983
Mangle new stb_image to our purposes.
Matti Hamalainen <ccr@tnsp.org>
parents:
893
diff
changeset
|
6240 1.21 fix use of 'Uint8' in header (reported by jon blow) |
893
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6241 1.20 added support for Softimage PIC, by Tom Seddon |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6242 1.19 bug in interlaced PNG corruption check (found by ryg) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6243 1.18 2008-08-02 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6244 fix a threading bug (local mutable static) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6245 1.17 support interlaced PNG |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6246 1.16 major bugfix - stbi__convert_format converted one too many pixels |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6247 1.15 initialize some fields for thread safety |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6248 1.14 fix threadsafe conversion bug |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6249 header-file-only version (#define STBI_HEADER_FILE_ONLY before including) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6250 1.13 threadsafe |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6251 1.12 const qualifiers in the API |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6252 1.11 Support installable IDCT, colorspace conversion routines |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6253 1.10 Fixes for 64-bit (don't use "unsigned long") |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6254 optimized upsampling by Fabian "ryg" Giesen |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6255 1.09 Fix format-conversion for PSD code (bad global variables!) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6256 1.08 Thatcher Ulrich's PSD code integrated by Nicolas Schulz |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6257 1.07 attempt to fix C++ warning/errors again |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6258 1.06 attempt to fix C++ warning/errors again |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6259 1.05 fix TGA loading to return correct *comp and use good luminance calc |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6260 1.04 default float alpha is 1, not 255; use 'void *' for stbi_image_free |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6261 1.03 bugfixes to STBI_NO_STDIO, STBI_NO_HDR |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6262 1.02 support for (subset of) HDR files, float interface for preferred access to them |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6263 1.01 fix bug: possible bug in handling right-side up bmps... not sure |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6264 fix bug: the stbi__bmp_load() and stbi__tga_load() functions didn't work at all |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6265 1.00 interface to zlib that skips zlib header |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6266 0.99 correct handling of alpha in palette |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6267 0.98 TGA loader by lonesock; dynamically add loaders (untested) |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6268 0.97 jpeg errors on too large a file; also catch another malloc failure |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6269 0.96 fix detection of invalid v value - particleman@mollyrocket forum |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6270 0.95 during header scan, seek to markers in case of padding |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6271 0.94 STBI_NO_STDIO to disable stdio usage; rename all #defines the same |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6272 0.93 handle jpegtran output; verbose errors |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6273 0.92 read 4,8,16,24,32-bit BMP files of several formats |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6274 0.91 output 24-bit Windows 3.0 BMP files |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6275 0.90 fix a few more warnings; bump version number to approach 1.0 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6276 0.61 bugfixes due to Marc LeBlanc, Christopher Lloyd |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6277 0.60 fix compiling as c++ |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6278 0.59 fix warnings: merge Dave Moore's -Wall fixes |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6279 0.58 fix bug: zlib uncompressed mode len/nlen was wrong endian |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6280 0.57 fix bug: jpg last huffman symbol before marker was >9 bits but less than 16 available |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6281 0.56 fix bug: zlib uncompressed mode len vs. nlen |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6282 0.55 fix bug: restart_interval not initialized to 0 |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6283 0.54 allow NULL for 'int *comp' |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6284 0.53 fix bug in png 3->4; speedup png decoding |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6285 0.52 png handles req_comp=3,4 directly; minor cleanup; jpeg comments |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6286 0.51 obey req_comp requests, 1-component jpegs return as 1-component, |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6287 on 'test' only check type, not whether we support this variant |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6288 0.50 first released version |
83a8881c782b
Import newer version of stb_image.
Matti Hamalainen <ccr@tnsp.org>
parents:
870
diff
changeset
|
6289 */ |