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annotate tools/libgfx.h @ 2202:455a3849b8ac

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Comments and cosmetics.
author Matti Hamalainen <ccr@tnsp.org>
date Fri, 14 Jun 2019 01:56:47 +0300
parents 9a9493809b3a
children 1ea48084055e
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1 /*
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2 * Functions for loading and saving bitmap images
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3 * Programmed and designed by Matti 'ccr' Hamalainen
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4 * (C) Copyright 2012-2018 Tecnic Software productions (TNSP)
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5 *
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6 * Please read file 'COPYING' for information on license and distribution.
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7 */
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8 #ifndef LIBMGFX_H
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9 #define LIBMGFX_H 1
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10
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11 #include "dmlib.h"
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12 #include "dmres.h"
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13
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14
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15 #ifdef __cplusplus
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16 extern "C" {
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17 #endif
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18
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19
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20 enum
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21 {
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22 DM_IMGFMT_PNG,
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23 DM_IMGFMT_PPM,
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24 DM_IMGFMT_PCX,
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25 DM_IMGFMT_IFF_ILBM,
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26 DM_IMGFMT_IFF_PBM,
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27 DM_IMGFMT_IFF_ACBM,
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28 DM_IMGFMT_RAW,
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29 DM_IMGFMT_ARAW,
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30 DM_IMGFMT_CDUMP,
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31 };
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32
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33
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34 // Color formats (these can be used along with DM_FMT_*)
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35 enum
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36 {
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37 DM_PIXFMT_PALETTE = 0x0010,
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38 DM_PIXFMT_GRAYSCALE = 0x0020,
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39 DM_PIXFMT_RGB = 0x0040,
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40 DM_PIXFMT_RGBA = 0x0080,
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41
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42 DM_PIXFMT_ANY = 0x00f0,
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43 };
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45
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46 // Error handling modes
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47 enum
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48 {
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49 DM_ERRMODE_FAIL = 0,
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50 DM_ERRMODE_RECOV_1,
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51 DM_ERRMODE_RECOV_2,
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52 };
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53
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54
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55 // Probe scores
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56 enum
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57 {
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58 DM_PROBE_SCORE_FALSE = 0,
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59 DM_PROBE_SCORE_MAYBE = 250,
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60 DM_PROBE_SCORE_AVG = 500,
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61 DM_PROBE_SCORE_GOOD = 750,
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62 DM_PROBE_SCORE_MAX = 1000,
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63 };
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64
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65
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66 // Flags for readability/writeability of formats
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67 enum
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68 {
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69 DM_FMT_WR = 0x0001, // Format can be written
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70 DM_FMT_RD = 0x0002, // Format can be read
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71 DM_FMT_RDWR = (DM_FMT_RD | DM_FMT_WR), // Read and write support
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72 DM_FMT_BROKEN = 0x1000, // Support is broken/incomplete
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73 };
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74
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75
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76 typedef struct
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77 {
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78 int ncolors; // number of colors in palette, if any
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79 int ctransp; // transparency color index, -1 if none
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80 DMColor *colors;// colors
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81 } DMPalette;
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82
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83
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84 // Bitmapped image struct
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85 typedef struct
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86 {
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87 int pixfmt; // one of types specified by DM_PIXFMT_*
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88 int width, height;
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89 int pitch; // bytes per scanline
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90 int bpp; // bits per pixel
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91
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92 float aspect; // aspect ratio (vert / horiz), <= 0 if not set
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93
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94 BOOL constpal; // is the palette a const?
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95 DMPalette *pal; // pointer to palette struct, NULL if no palette
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96
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97 size_t size;
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98 Uint8 *data;
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99 } DMImage;
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100
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101
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102 typedef struct
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103 {
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104 int fmtid; // DM_IMGFMT_* of target format (a bit of a kludge here)
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105 int pixfmt; // Target color format DM_PIXFMT_*
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106 int scaleX, scaleY; // Integer scale factors (1..)
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107
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108 int nplanes, bpp, mask; // number of planes, bits per PLANE, masking
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109 BOOL planar; // use planar format if the format supports it
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110 int compression; // Use compression/compression level (0 = none, 9 = max)
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111 } DMImageWriteSpec;
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112
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113
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114 typedef struct
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115 {
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116 char *fext; // Typical filename extension
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117 char *name; // Format name / description
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118 int fmtid; // DM_IMGFMT_*
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119 int flags; // DM_FMT_* and DM_PIXFMT_* flags
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120
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121 int (*probe)(const Uint8 *buf, const size_t len);
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122 int (*read)(DMResource *fp, DMImage **pimg);
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123 int (*write)(DMResource *fp, const DMImage *pimg, const DMImageWriteSpec *spec);
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124 } DMImageFormat;
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125
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126
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127 extern const DMImageFormat dmImageFormatList[];
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128 extern const int ndmImageFormatList;
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129 extern int dmGFXErrorMode;
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130
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131
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132 DMImage * dmImageAlloc(const int width, const int height, const int format, const int bpp);
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133 void dmImageFree(DMImage *img);
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134 int dmImageGetBytesPerPixel(const int format);
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135 int dmImageGetBitsPerPixel(const int format);
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136 int dmImageProbeGeneric(const Uint8 *buf, const size_t len, const DMImageFormat **fmt, int *index);
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137 int dmGetNPlanesFromNColors(const int ncolors);
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139 BOOL dmCompareColor(const DMColor *c1, const DMColor *c2, const BOOL alpha);
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140 int dmPaletteAlloc(DMPalette **ppal, const int ncolors, const int ctransp);
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141 int dmPaletteResize(DMPalette **ppal, const int ncolors);
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142 void dmPaletteFree(DMPalette *pal);
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143 int dmPaletteCopy(DMPalette **pdst, const DMPalette *src);
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144
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145
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146 int dmWriteImageData(const DMImage *img, void *cbdata,
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147 int (*writeRowCB)(void *, const Uint8 *, const size_t), const DMImageWriteSpec *spec);
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148
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149
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150 int dmWriteIFFMasterRAWHeader(DMResource *fp, const char *filename, const char *prefix, const DMImage *img, const DMImageWriteSpec *spec);
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151 int dmWriteRAWImage(DMResource *fp, const DMImage *img, const DMImageWriteSpec *spec);
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152
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153 int dmWritePPMImage(DMResource *fp, const DMImage *img, const DMImageWriteSpec *spec);
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154 int dmReadPPMImage(DMResource *fp, DMImage **pimg);
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155
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156 #ifdef DM_USE_LIBPNG
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157 int dmWritePNGImage(DMResource *fp, const DMImage *img, const DMImageWriteSpec *spec);
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158 int dmReadPNGImage(DMResource *fp, DMImage **pimg);
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159 #endif
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160
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161 int dmWritePCXImage(DMResource *fp, const DMImage *img, const DMImageWriteSpec *spec);
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162 int dmReadPCXImage(DMResource *fp, DMImage **pimg);
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163
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164 int dmReadIFFImage(DMResource *fp, DMImage **pimg);
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165 int dmWriteIFFImage(DMResource *fp, const DMImage *img, const DMImageWriteSpec *spec);
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166
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167
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455a3849b8ac Comments and cosmetics.
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168 //
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169 // Simplistic bitstream reading and writing
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170 //
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171 typedef struct _DMBitStreamContext
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172 {
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173 void *handle;
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174
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175 int (*putByte)(struct _DMBitStreamContext *ctx);
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176 int (*getByte)(struct _DMBitStreamContext *ctx);
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177
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178 unsigned int
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179 outBuf, outBitCount, outByteCount,
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180 inBuf, inBitCount, inByteCount;
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181 } DMBitStreamContext;
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182
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183
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184 void dmInitBitStreamContext(DMBitStreamContext *ctx);
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185 int dmFlushBitStream(DMBitStreamContext *ctx);
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186 int dmInitBitStreamRes(DMBitStreamContext *ctx, DMResource *fp);
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187
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188 int dmPutBits(DMBitStreamContext *ctx, const unsigned int val, const unsigned int n);
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189 int dmGetBits(DMBitStreamContext *ctx, unsigned int *val, const unsigned int n);
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190
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191
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192 #ifdef __cplusplus
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193 }
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194 #endif
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195
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196 #endif // LIBMGFX_H