Mercurial > hg > dmlib
annotate dmimage.c @ 757:dd59a650a318
Fix 24-bit surface conversions in image loader.
| author | Matti Hamalainen <ccr@tnsp.org> |
|---|---|
| date | Wed, 08 May 2013 02:02:01 +0300 |
| parents | 32250b436bca |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * DMLib | |
| 3 * -- Bitmap image conversion and loading | |
| 4 * Programmed and designed by Matti 'ccr' Hamalainen | |
| 5 * (C) Copyright 2012 Tecnic Software productions (TNSP) | |
| 6 */ | |
| 7 #include "dmimage.h" | |
| 8 | |
| 9 | |
| 10 #define STBI_FAILURE_USERMSG 1 | |
| 11 #define STBI_NO_STDIO 1 | |
| 12 #define STBI_NO_HDR 1 | |
| 13 #include "stb_image.c" | |
| 14 | |
| 15 | |
| 16 SDL_Surface *dmCreateRGBSurfaceFrom(void *data, const int width, const int height, const int depth, const int pitch, const int rmask, const int gmask, const int bmask, const int amask) | |
| 17 { | |
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18 // Create source surface from given data |
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19 SDL_Surface *tmp = SDL_CreateRGBSurfaceFrom(data, width, height, depth, pitch, bmask, gmask, rmask, amask); |
| 0 | 20 |
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21 // Result surface component orders as masks |
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22 #if SDL_BYTEORDER == SDL_BIG_ENDIAN |
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23 Uint32 |
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24 Xrmask = 0xff000000, |
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25 Xgmask = 0x00ff0000, |
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26 Xbmask = 0x0000ff00, |
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27 Xamask = 0x000000ff; |
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28 #else |
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29 Uint32 |
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30 Xrmask = 0x000000ff, |
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31 Xgmask = 0x0000ff00, |
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32 Xbmask = 0x00ff0000, |
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33 Xamask = 0xff000000; |
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34 #endif |
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35 |
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36 // Create result conversion surface |
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37 SDL_Surface |
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38 *result = NULL, |
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39 *pixtmp = SDL_CreateRGBSurface( |
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40 SDL_SWSURFACE | SDL_SRCALPHA, 16, 16, 32, Xrmask, Xgmask, Xbmask, Xamask); |
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41 |
| 0 | 42 if (tmp != NULL && pixtmp != NULL) |
| 43 { | |
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44 // Convert surface |
| 0 | 45 result = SDL_ConvertSurface(tmp, pixtmp->format, SDL_SWSURFACE | SDL_SRCALPHA); |
| 46 SDL_FreeSurface(tmp); | |
| 47 } | |
| 48 if (pixtmp != NULL) | |
| 49 SDL_FreeSurface(pixtmp); | |
| 50 | |
| 51 return result; | |
| 52 } | |
| 53 | |
| 54 | |
| 55 SDL_Surface *dmCreatePaletteSurfaceFrom(void *data, const int width, const int height, const int pitch) | |
| 56 { | |
| 57 int yc; | |
| 58 Uint8 *dst, *src; | |
| 59 SDL_Surface *result; | |
| 60 result = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height, 8, 0,0,0,0); | |
| 61 if (result == NULL) | |
| 62 return NULL; | |
| 63 | |
| 64 dst = result->pixels; | |
| 65 src = data; | |
| 66 for (yc = 0; yc < height; yc++) | |
| 67 { | |
| 68 memcpy(dst, src, width * sizeof(Uint8)); | |
| 69 dst += result->pitch; | |
| 70 src += pitch; | |
| 71 } | |
| 72 | |
| 73 return result; | |
| 74 } | |
| 75 | |
| 76 | |
| 77 | |
| 78 static int dmSTBIread(void *user, char *data, int size) | |
| 79 { | |
| 80 return dmfread(data, 1, size, (DMResource *) user); | |
| 81 } | |
| 82 | |
| 83 | |
| 84 static void dmSTBIskip(void *user, unsigned int n) | |
| 85 { | |
| 86 dmfseek((DMResource *) user, n, SEEK_CUR); | |
| 87 } | |
| 88 | |
| 89 | |
| 90 static int dmSTBIeof(void *user) | |
| 91 { | |
| 92 return dmfeof((DMResource *) user); | |
| 93 } | |
| 94 | |
| 95 | |
| 96 static const stbi_io_callbacks dmSTBICallbacks = | |
| 97 { | |
| 98 dmSTBIread, | |
| 99 dmSTBIskip, | |
| 100 dmSTBIeof, | |
| 101 }; | |
| 102 | |
| 103 | |
| 104 SDL_Surface *dmLoadImage(DMResource *file) | |
| 105 { | |
| 106 Uint32 rmask, gmask, bmask, amask; | |
| 107 SDL_Surface *result = NULL; | |
| 108 int width, height, comp; | |
| 109 Uint8 *data; | |
| 110 | |
| 111 data = stbi_load_from_callbacks(&dmSTBICallbacks, file, &width, &height, &comp, 0); | |
| 112 | |
| 113 if (data == NULL) | |
| 114 { | |
| 115 dmError("Error decoding image resource %p '%s' [%d, %d, %d]: %s\n", | |
| 116 file, file->filename, width, height, comp, stbi_failure_reason()); | |
| 117 return NULL; | |
| 118 } | |
| 119 | |
| 120 | |
| 121 switch (comp) | |
| 122 { | |
| 123 case 4: | |
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124 #if SDL_BYTEORDER == SDL_BIG_ENDIAN |
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dd59a650a318
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125 rmask = 0xff000000; |
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126 gmask = 0x00ff0000; |
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127 bmask = 0x0000ff00; |
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128 amask = 0x000000ff; |
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129 #else |
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130 rmask = 0x000000ff; |
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131 gmask = 0x0000ff00; |
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132 bmask = 0x00ff0000; |
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133 amask = 0xff000000; |
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134 #endif |
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135 result = dmCreateRGBSurfaceFrom(data, width, height, comp * 8, |
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136 width * comp, rmask, gmask, bmask, amask); |
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137 break; |
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138 |
| 0 | 139 case 3: |
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140 #if SDL_BYTEORDER == SDL_BIG_ENDIAN |
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dd59a650a318
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141 rmask = 0x00ff0000; |
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dd59a650a318
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142 gmask = 0x0000ff00; |
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dd59a650a318
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parents:
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143 bmask = 0x000000ff; |
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dd59a650a318
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144 amask = 0x00000000; |
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145 #else |
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Fix 24-bit surface conversions in image loader.
Matti Hamalainen <ccr@tnsp.org>
parents:
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diff
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146 rmask = 0x000000ff; |
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dd59a650a318
Fix 24-bit surface conversions in image loader.
Matti Hamalainen <ccr@tnsp.org>
parents:
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diff
changeset
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147 gmask = 0x0000ff00; |
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dd59a650a318
Fix 24-bit surface conversions in image loader.
Matti Hamalainen <ccr@tnsp.org>
parents:
0
diff
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148 bmask = 0x00ff0000; |
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dd59a650a318
Fix 24-bit surface conversions in image loader.
Matti Hamalainen <ccr@tnsp.org>
parents:
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diff
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149 amask = 0x00000000; |
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dd59a650a318
Fix 24-bit surface conversions in image loader.
Matti Hamalainen <ccr@tnsp.org>
parents:
0
diff
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150 #endif |
| 0 | 151 result = dmCreateRGBSurfaceFrom(data, width, height, comp * 8, |
| 152 width * comp, rmask, gmask, bmask, amask); | |
| 153 break; | |
| 154 | |
| 155 case 1: | |
| 156 result = dmCreatePaletteSurfaceFrom(data, width, height, width * comp); | |
| 157 break; | |
| 158 } | |
| 159 | |
| 160 stbi_image_free(data); | |
| 161 | |
| 162 if (result == NULL) | |
| 163 { | |
| 164 dmError("Format conversion failed for image resource %p '%s' [%d, %d, %d].\n", | |
| 165 file, file->filename, width, height, comp); | |
| 166 } | |
| 167 | |
| 168 return result; | |
| 169 } |