Mercurial > sdl-ios-xcode
annotate src/video/SDL_bmp.c @ 410:365f57b7c4ac
*** empty log message ***
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 13 Jun 2002 12:00:34 +0000 |
| parents | f6ffac90895c |
| children | b8d311d90021 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
297
f6ffac90895c
Updated copyright information for 2002
Sam Lantinga <slouken@libsdl.org>
parents:
252
diff
changeset
|
3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
252
e8157fcb3114
Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
parents:
0
diff
changeset
|
20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 #ifndef DISABLE_FILE | |
| 29 | |
| 30 /* | |
| 31 Code to load and save surfaces in Windows BMP format. | |
| 32 | |
| 33 Why support BMP format? Well, it's a native format for Windows, and | |
| 34 most image processing programs can read and write it. It would be nice | |
| 35 to be able to have at least one image format that we can natively load | |
| 36 and save, and since PNG is so complex that it would bloat the library, | |
| 37 BMP is a good alternative. | |
| 38 | |
| 39 This code currently supports Win32 DIBs in uncompressed 8 and 24 bpp. | |
| 40 */ | |
| 41 | |
| 42 #include <string.h> | |
| 43 | |
| 44 #include "SDL_error.h" | |
| 45 #include "SDL_video.h" | |
| 46 #include "SDL_endian.h" | |
| 47 | |
| 48 /* Compression encodings for BMP files */ | |
| 49 #ifndef BI_RGB | |
| 50 #define BI_RGB 0 | |
| 51 #define BI_RLE8 1 | |
| 52 #define BI_RLE4 2 | |
| 53 #define BI_BITFIELDS 3 | |
| 54 #endif | |
| 55 | |
| 56 | |
| 57 SDL_Surface * SDL_LoadBMP_RW (SDL_RWops *src, int freesrc) | |
| 58 { | |
| 59 int was_error; | |
| 60 long fp_offset; | |
| 61 int bmpPitch; | |
| 62 int i, pad; | |
| 63 SDL_Surface *surface; | |
| 64 Uint32 Rmask; | |
| 65 Uint32 Gmask; | |
| 66 Uint32 Bmask; | |
| 67 SDL_Palette *palette; | |
| 68 Uint8 *bits; | |
| 69 int ExpandBMP; | |
| 70 | |
| 71 /* The Win32 BMP file header (14 bytes) */ | |
| 72 char magic[2]; | |
| 73 Uint32 bfSize; | |
| 74 Uint16 bfReserved1; | |
| 75 Uint16 bfReserved2; | |
| 76 Uint32 bfOffBits; | |
| 77 | |
| 78 /* The Win32 BITMAPINFOHEADER struct (40 bytes) */ | |
| 79 Uint32 biSize; | |
| 80 Sint32 biWidth; | |
| 81 Sint32 biHeight; | |
| 82 Uint16 biPlanes; | |
| 83 Uint16 biBitCount; | |
| 84 Uint32 biCompression; | |
| 85 Uint32 biSizeImage; | |
| 86 Sint32 biXPelsPerMeter; | |
| 87 Sint32 biYPelsPerMeter; | |
| 88 Uint32 biClrUsed; | |
| 89 Uint32 biClrImportant; | |
| 90 | |
| 91 /* Make sure we are passed a valid data source */ | |
| 92 surface = NULL; | |
| 93 was_error = 0; | |
| 94 if ( src == NULL ) { | |
| 95 was_error = 1; | |
| 96 goto done; | |
| 97 } | |
| 98 | |
| 99 /* Read in the BMP file header */ | |
| 100 fp_offset = SDL_RWtell(src); | |
| 101 SDL_ClearError(); | |
| 102 if ( SDL_RWread(src, magic, 1, 2) != 2 ) { | |
| 103 SDL_Error(SDL_EFREAD); | |
| 104 was_error = 1; | |
| 105 goto done; | |
| 106 } | |
| 107 if ( strncmp(magic, "BM", 2) != 0 ) { | |
| 108 SDL_SetError("File is not a Windows BMP file"); | |
| 109 was_error = 1; | |
| 110 goto done; | |
| 111 } | |
| 112 bfSize = SDL_ReadLE32(src); | |
| 113 bfReserved1 = SDL_ReadLE16(src); | |
| 114 bfReserved2 = SDL_ReadLE16(src); | |
| 115 bfOffBits = SDL_ReadLE32(src); | |
| 116 | |
| 117 /* Read the Win32 BITMAPINFOHEADER */ | |
| 118 biSize = SDL_ReadLE32(src); | |
| 119 if ( biSize == 12 ) { | |
| 120 biWidth = (Uint32)SDL_ReadLE16(src); | |
| 121 biHeight = (Uint32)SDL_ReadLE16(src); | |
| 122 biPlanes = SDL_ReadLE16(src); | |
| 123 biBitCount = SDL_ReadLE16(src); | |
| 124 biCompression = BI_RGB; | |
| 125 biSizeImage = 0; | |
| 126 biXPelsPerMeter = 0; | |
| 127 biYPelsPerMeter = 0; | |
| 128 biClrUsed = 0; | |
| 129 biClrImportant = 0; | |
| 130 } else { | |
| 131 biWidth = SDL_ReadLE32(src); | |
| 132 biHeight = SDL_ReadLE32(src); | |
| 133 biPlanes = SDL_ReadLE16(src); | |
| 134 biBitCount = SDL_ReadLE16(src); | |
| 135 biCompression = SDL_ReadLE32(src); | |
| 136 biSizeImage = SDL_ReadLE32(src); | |
| 137 biXPelsPerMeter = SDL_ReadLE32(src); | |
| 138 biYPelsPerMeter = SDL_ReadLE32(src); | |
| 139 biClrUsed = SDL_ReadLE32(src); | |
| 140 biClrImportant = SDL_ReadLE32(src); | |
| 141 } | |
| 142 | |
| 143 /* Check for read error */ | |
| 144 if ( strcmp(SDL_GetError(), "") != 0 ) { | |
| 145 was_error = 1; | |
| 146 goto done; | |
| 147 } | |
| 148 | |
| 149 /* Expand 1 and 4 bit bitmaps to 8 bits per pixel */ | |
| 150 switch (biBitCount) { | |
| 151 case 1: | |
| 152 case 4: | |
| 153 ExpandBMP = biBitCount; | |
| 154 biBitCount = 8; | |
| 155 break; | |
| 156 default: | |
| 157 ExpandBMP = 0; | |
| 158 break; | |
| 159 } | |
| 160 | |
| 161 /* We don't support any BMP compression right now */ | |
| 162 Rmask = Gmask = Bmask = 0; | |
| 163 switch (biCompression) { | |
| 164 case BI_RGB: | |
| 165 /* If there are no masks, use the defaults */ | |
| 166 if ( bfOffBits == (14+biSize) ) { | |
| 167 /* Default values for the BMP format */ | |
| 168 switch (biBitCount) { | |
| 169 case 15: | |
| 170 case 16: | |
| 171 Rmask = 0x7C00; | |
| 172 Gmask = 0x03E0; | |
| 173 Bmask = 0x001F; | |
| 174 break; | |
| 175 case 24: | |
| 176 #if SDL_BYTEORDER == SDL_BIG_ENDIAN | |
| 177 Rmask = 0x000000FF; | |
| 178 Gmask = 0x0000FF00; | |
| 179 Bmask = 0x00FF0000; | |
| 180 break; | |
| 181 #endif | |
| 182 case 32: | |
| 183 Rmask = 0x00FF0000; | |
| 184 Gmask = 0x0000FF00; | |
| 185 Bmask = 0x000000FF; | |
| 186 break; | |
| 187 default: | |
| 188 break; | |
| 189 } | |
| 190 break; | |
| 191 } | |
| 192 /* Fall through -- read the RGB masks */ | |
| 193 | |
| 194 case BI_BITFIELDS: | |
| 195 switch (biBitCount) { | |
| 196 case 15: | |
| 197 case 16: | |
| 198 case 32: | |
| 199 Rmask = SDL_ReadLE32(src); | |
| 200 Gmask = SDL_ReadLE32(src); | |
| 201 Bmask = SDL_ReadLE32(src); | |
| 202 break; | |
| 203 default: | |
| 204 break; | |
| 205 } | |
| 206 break; | |
| 207 default: | |
| 208 SDL_SetError("Compressed BMP files not supported"); | |
| 209 was_error = 1; | |
| 210 goto done; | |
| 211 } | |
| 212 | |
| 213 /* Create a compatible surface, note that the colors are RGB ordered */ | |
| 214 surface = SDL_CreateRGBSurface(SDL_SWSURFACE, | |
| 215 biWidth, biHeight, biBitCount, Rmask, Gmask, Bmask, 0); | |
| 216 if ( surface == NULL ) { | |
| 217 was_error = 1; | |
| 218 goto done; | |
| 219 } | |
| 220 | |
| 221 /* Load the palette, if any */ | |
| 222 palette = (surface->format)->palette; | |
| 223 if ( palette ) { | |
| 224 if ( biClrUsed == 0 ) { | |
| 225 biClrUsed = 1 << biBitCount; | |
| 226 } | |
| 227 if ( biSize == 12 ) { | |
| 228 for ( i = 0; i < (int)biClrUsed; ++i ) { | |
| 229 SDL_RWread(src, &palette->colors[i].b, 1, 1); | |
| 230 SDL_RWread(src, &palette->colors[i].g, 1, 1); | |
| 231 SDL_RWread(src, &palette->colors[i].r, 1, 1); | |
| 232 palette->colors[i].unused = 0; | |
| 233 } | |
| 234 } else { | |
| 235 for ( i = 0; i < (int)biClrUsed; ++i ) { | |
| 236 SDL_RWread(src, &palette->colors[i].b, 1, 1); | |
| 237 SDL_RWread(src, &palette->colors[i].g, 1, 1); | |
| 238 SDL_RWread(src, &palette->colors[i].r, 1, 1); | |
| 239 SDL_RWread(src, &palette->colors[i].unused, 1, 1); | |
| 240 } | |
| 241 } | |
| 242 palette->ncolors = biClrUsed; | |
| 243 } | |
| 244 | |
| 245 /* Read the surface pixels. Note that the bmp image is upside down */ | |
| 246 if ( SDL_RWseek(src, fp_offset+bfOffBits, SEEK_SET) < 0 ) { | |
| 247 SDL_Error(SDL_EFSEEK); | |
| 248 was_error = 1; | |
| 249 goto done; | |
| 250 } | |
| 251 bits = (Uint8 *)surface->pixels+(surface->h*surface->pitch); | |
| 252 switch (ExpandBMP) { | |
| 253 case 1: | |
| 254 bmpPitch = (biWidth + 7) >> 3; | |
| 255 pad = (((bmpPitch)%4) ? (4-((bmpPitch)%4)) : 0); | |
| 256 break; | |
| 257 case 4: | |
| 258 bmpPitch = (biWidth + 1) >> 1; | |
| 259 pad = (((bmpPitch)%4) ? (4-((bmpPitch)%4)) : 0); | |
| 260 break; | |
| 261 default: | |
| 262 pad = ((surface->pitch%4) ? | |
| 263 (4-(surface->pitch%4)) : 0); | |
| 264 break; | |
| 265 } | |
| 266 while ( bits > (Uint8 *)surface->pixels ) { | |
| 267 bits -= surface->pitch; | |
| 268 switch (ExpandBMP) { | |
| 269 case 1: | |
| 270 case 4: { | |
| 271 Uint8 pixel = 0; | |
| 272 int shift = (8-ExpandBMP); | |
| 273 for ( i=0; i<surface->w; ++i ) { | |
| 274 if ( i%(8/ExpandBMP) == 0 ) { | |
| 275 if ( !SDL_RWread(src, &pixel, 1, 1) ) { | |
| 276 SDL_SetError( | |
| 277 "Error reading from BMP"); | |
| 278 was_error = 1; | |
| 279 goto done; | |
| 280 } | |
| 281 } | |
| 282 *(bits+i) = (pixel>>shift); | |
| 283 pixel <<= ExpandBMP; | |
| 284 } } | |
| 285 break; | |
| 286 | |
| 287 default: | |
| 288 if ( SDL_RWread(src, bits, 1, surface->pitch) | |
| 289 != surface->pitch ) { | |
| 290 SDL_Error(SDL_EFREAD); | |
| 291 was_error = 1; | |
| 292 goto done; | |
| 293 } | |
| 294 #if SDL_BYTEORDER == SDL_BIG_ENDIAN | |
| 295 /* Byte-swap the pixels if needed. Note that the 24bpp | |
| 296 case has already been taken care of above. */ | |
| 297 switch(biBitCount) { | |
| 298 case 15: | |
| 299 case 16: { | |
| 300 Uint16 *pix = (Uint16 *)bits; | |
| 301 for(i = 0; i < surface->w; i++) | |
| 302 pix[i] = SDL_Swap16(pix[i]); | |
| 303 break; | |
| 304 } | |
| 305 | |
| 306 case 32: { | |
| 307 Uint32 *pix = (Uint32 *)bits; | |
| 308 for(i = 0; i < surface->w; i++) | |
| 309 pix[i] = SDL_Swap32(pix[i]); | |
| 310 break; | |
| 311 } | |
| 312 } | |
| 313 #endif | |
| 314 break; | |
| 315 } | |
| 316 /* Skip padding bytes, ugh */ | |
| 317 if ( pad ) { | |
| 318 Uint8 padbyte; | |
| 319 for ( i=0; i<pad; ++i ) { | |
| 320 SDL_RWread(src, &padbyte, 1, 1); | |
| 321 } | |
| 322 } | |
| 323 } | |
| 324 done: | |
| 325 if ( was_error ) { | |
| 326 if ( surface ) { | |
| 327 SDL_FreeSurface(surface); | |
| 328 } | |
| 329 surface = NULL; | |
| 330 } | |
| 331 if ( freesrc && src ) { | |
| 332 SDL_RWclose(src); | |
| 333 } | |
| 334 return(surface); | |
| 335 } | |
| 336 | |
| 337 int SDL_SaveBMP_RW (SDL_Surface *saveme, SDL_RWops *dst, int freedst) | |
| 338 { | |
| 339 long fp_offset; | |
| 340 int i, pad; | |
| 341 SDL_Surface *surface; | |
| 342 Uint8 *bits; | |
| 343 | |
| 344 /* The Win32 BMP file header (14 bytes) */ | |
| 345 char magic[2] = { 'B', 'M' }; | |
| 346 Uint32 bfSize; | |
| 347 Uint16 bfReserved1; | |
| 348 Uint16 bfReserved2; | |
| 349 Uint32 bfOffBits; | |
| 350 | |
| 351 /* The Win32 BITMAPINFOHEADER struct (40 bytes) */ | |
| 352 Uint32 biSize; | |
| 353 Sint32 biWidth; | |
| 354 Sint32 biHeight; | |
| 355 Uint16 biPlanes; | |
| 356 Uint16 biBitCount; | |
| 357 Uint32 biCompression; | |
| 358 Uint32 biSizeImage; | |
| 359 Sint32 biXPelsPerMeter; | |
| 360 Sint32 biYPelsPerMeter; | |
| 361 Uint32 biClrUsed; | |
| 362 Uint32 biClrImportant; | |
| 363 | |
| 364 /* Make sure we have somewhere to save */ | |
| 365 surface = NULL; | |
| 366 if ( dst ) { | |
| 367 if ( saveme->format->palette ) { | |
| 368 if ( saveme->format->BitsPerPixel == 8 ) { | |
| 369 surface = saveme; | |
| 370 } else { | |
| 371 SDL_SetError("%d bpp BMP files not supported", | |
| 372 saveme->format->BitsPerPixel); | |
| 373 } | |
| 374 } | |
| 375 else if ( (saveme->format->BitsPerPixel == 24) && | |
| 376 #if SDL_BYTEORDER == SDL_LIL_ENDIAN | |
| 377 (saveme->format->Rmask == 0x00FF0000) && | |
| 378 (saveme->format->Gmask == 0x0000FF00) && | |
| 379 (saveme->format->Bmask == 0x000000FF) | |
| 380 #else | |
| 381 (saveme->format->Rmask == 0x000000FF) && | |
| 382 (saveme->format->Gmask == 0x0000FF00) && | |
| 383 (saveme->format->Bmask == 0x00FF0000) | |
| 384 #endif | |
| 385 ) { | |
| 386 surface = saveme; | |
| 387 } else { | |
| 388 SDL_Rect bounds; | |
| 389 | |
| 390 /* Convert to 24 bits per pixel */ | |
| 391 surface = SDL_CreateRGBSurface(SDL_SWSURFACE, | |
| 392 saveme->w, saveme->h, 24, | |
| 393 #if SDL_BYTEORDER == SDL_LIL_ENDIAN | |
| 394 0x00FF0000, 0x0000FF00, 0x000000FF, | |
| 395 #else | |
| 396 0x000000FF, 0x0000FF00, 0x00FF0000, | |
| 397 #endif | |
| 398 0); | |
| 399 if ( surface != NULL ) { | |
| 400 bounds.x = 0; | |
| 401 bounds.y = 0; | |
| 402 bounds.w = saveme->w; | |
| 403 bounds.h = saveme->h; | |
| 404 if ( SDL_LowerBlit(saveme, &bounds, surface, | |
| 405 &bounds) < 0 ) { | |
| 406 SDL_FreeSurface(surface); | |
| 407 SDL_SetError( | |
| 408 "Couldn't convert image to 24 bpp"); | |
| 409 surface = NULL; | |
| 410 } | |
| 411 } | |
| 412 } | |
| 413 } | |
| 414 | |
| 415 if ( surface && (SDL_LockSurface(surface) == 0) ) { | |
| 416 /* Set the BMP file header values */ | |
| 417 bfSize = 0; /* We'll write this when we're done */ | |
| 418 bfReserved1 = 0; | |
| 419 bfReserved2 = 0; | |
| 420 bfOffBits = 0; /* We'll write this when we're done */ | |
| 421 | |
| 422 /* Write the BMP file header values */ | |
| 423 fp_offset = SDL_RWtell(dst); | |
| 424 SDL_ClearError(); | |
| 425 SDL_RWwrite(dst, magic, 2, 1); | |
| 426 SDL_WriteLE32(dst, bfSize); | |
| 427 SDL_WriteLE16(dst, bfReserved1); | |
| 428 SDL_WriteLE16(dst, bfReserved2); | |
| 429 SDL_WriteLE32(dst, bfOffBits); | |
| 430 | |
| 431 /* Set the BMP info values */ | |
| 432 biSize = 40; | |
| 433 biWidth = surface->w; | |
| 434 biHeight = surface->h; | |
| 435 biPlanes = 1; | |
| 436 biBitCount = surface->format->BitsPerPixel; | |
| 437 biCompression = BI_RGB; | |
| 438 biSizeImage = surface->h*surface->pitch; | |
| 439 biXPelsPerMeter = 0; | |
| 440 biYPelsPerMeter = 0; | |
| 441 if ( surface->format->palette ) { | |
| 442 biClrUsed = surface->format->palette->ncolors; | |
| 443 } else { | |
| 444 biClrUsed = 0; | |
| 445 } | |
| 446 biClrImportant = 0; | |
| 447 | |
| 448 /* Write the BMP info values */ | |
| 449 SDL_WriteLE32(dst, biSize); | |
| 450 SDL_WriteLE32(dst, biWidth); | |
| 451 SDL_WriteLE32(dst, biHeight); | |
| 452 SDL_WriteLE16(dst, biPlanes); | |
| 453 SDL_WriteLE16(dst, biBitCount); | |
| 454 SDL_WriteLE32(dst, biCompression); | |
| 455 SDL_WriteLE32(dst, biSizeImage); | |
| 456 SDL_WriteLE32(dst, biXPelsPerMeter); | |
| 457 SDL_WriteLE32(dst, biYPelsPerMeter); | |
| 458 SDL_WriteLE32(dst, biClrUsed); | |
| 459 SDL_WriteLE32(dst, biClrImportant); | |
| 460 | |
| 461 /* Write the palette (in BGR color order) */ | |
| 462 if ( surface->format->palette ) { | |
| 463 SDL_Color *colors; | |
| 464 int ncolors; | |
| 465 | |
| 466 colors = surface->format->palette->colors; | |
| 467 ncolors = surface->format->palette->ncolors; | |
| 468 for ( i=0; i<ncolors; ++i ) { | |
| 469 SDL_RWwrite(dst, &colors[i].b, 1, 1); | |
| 470 SDL_RWwrite(dst, &colors[i].g, 1, 1); | |
| 471 SDL_RWwrite(dst, &colors[i].r, 1, 1); | |
| 472 SDL_RWwrite(dst, &colors[i].unused, 1, 1); | |
| 473 } | |
| 474 } | |
| 475 | |
| 476 /* Write the bitmap offset */ | |
| 477 bfOffBits = SDL_RWtell(dst)-fp_offset; | |
| 478 if ( SDL_RWseek(dst, fp_offset+10, SEEK_SET) < 0 ) { | |
| 479 SDL_Error(SDL_EFSEEK); | |
| 480 } | |
| 481 SDL_WriteLE32(dst, bfOffBits); | |
| 482 if ( SDL_RWseek(dst, fp_offset+bfOffBits, SEEK_SET) < 0 ) { | |
| 483 SDL_Error(SDL_EFSEEK); | |
| 484 } | |
| 485 | |
| 486 /* Write the bitmap image upside down */ | |
| 487 bits = (Uint8 *)surface->pixels+(surface->h*surface->pitch); | |
| 488 pad = ((surface->pitch%4) ? (4-(surface->pitch%4)) : 0); | |
| 489 while ( bits > (Uint8 *)surface->pixels ) { | |
| 490 bits -= surface->pitch; | |
| 491 if ( SDL_RWwrite(dst, bits, 1, surface->pitch) | |
| 492 != surface->pitch) { | |
| 493 SDL_Error(SDL_EFWRITE); | |
| 494 break; | |
| 495 } | |
| 496 if ( pad ) { | |
| 497 const Uint8 padbyte = 0; | |
| 498 for ( i=0; i<pad; ++i ) { | |
| 499 SDL_RWwrite(dst, &padbyte, 1, 1); | |
| 500 } | |
| 501 } | |
| 502 } | |
| 503 | |
| 504 /* Write the BMP file size */ | |
| 505 bfSize = SDL_RWtell(dst)-fp_offset; | |
| 506 if ( SDL_RWseek(dst, fp_offset+2, SEEK_SET) < 0 ) { | |
| 507 SDL_Error(SDL_EFSEEK); | |
| 508 } | |
| 509 SDL_WriteLE32(dst, bfSize); | |
| 510 if ( SDL_RWseek(dst, fp_offset+bfSize, SEEK_SET) < 0 ) { | |
| 511 SDL_Error(SDL_EFSEEK); | |
| 512 } | |
| 513 | |
| 514 /* Close it up.. */ | |
| 515 SDL_UnlockSurface(surface); | |
| 516 if ( surface != saveme ) { | |
| 517 SDL_FreeSurface(surface); | |
| 518 } | |
| 519 } | |
| 520 | |
| 521 if ( freedst && dst ) { | |
| 522 SDL_RWclose(dst); | |
| 523 } | |
| 524 return((strcmp(SDL_GetError(), "") == 0) ? 0 : -1); | |
| 525 } | |
| 526 | |
| 527 #endif /* ENABLE_FILE */ |