Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit_1.c @ 1824:e25445333ccf
Fixed signed/unsigned issues
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 12 May 2006 04:21:19 +0000 |
| parents | d910939febfa |
| children | 782fd950bd46 c121d94672cb a1b03ba2fcd0 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
|
3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 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 | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
13 Lesser General Public License for more details. |
| 0 | 14 |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
15 You should have received a copy of the GNU Lesser General Public |
|
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
16 License along with this library; if not, write to the Free Software |
|
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
|
252
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Updated the source with the correct e-mail address
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20 slouken@libsdl.org |
| 0 | 21 */ |
|
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Use consistent identifiers for the various platforms we support.
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 #include "SDL_video.h" | |
| 25 #include "SDL_blit.h" | |
| 26 #include "SDL_sysvideo.h" | |
| 27 #include "SDL_endian.h" | |
| 28 | |
| 29 /* Functions to blit from 8-bit surfaces to other surfaces */ | |
| 30 | |
| 31 static void Blit1to1(SDL_BlitInfo *info) | |
| 32 { | |
| 33 #ifndef USE_DUFFS_LOOP | |
| 34 int c; | |
| 35 #endif | |
| 36 int width, height; | |
| 37 Uint8 *src, *map, *dst; | |
| 38 int srcskip, dstskip; | |
| 39 | |
| 40 /* Set up some basic variables */ | |
| 41 width = info->d_width; | |
| 42 height = info->d_height; | |
| 43 src = info->s_pixels; | |
| 44 srcskip = info->s_skip; | |
| 45 dst = info->d_pixels; | |
| 46 dstskip = info->d_skip; | |
| 47 map = info->table; | |
| 48 | |
| 49 while ( height-- ) { | |
| 50 #ifdef USE_DUFFS_LOOP | |
| 51 DUFFS_LOOP( | |
| 52 { | |
| 53 *dst = map[*src]; | |
| 54 } | |
| 55 dst++; | |
| 56 src++; | |
| 57 , width); | |
| 58 #else | |
| 59 for ( c=width; c; --c ) { | |
| 60 *dst = map[*src]; | |
| 61 dst++; | |
| 62 src++; | |
| 63 } | |
| 64 #endif | |
| 65 src += srcskip; | |
| 66 dst += dstskip; | |
| 67 } | |
| 68 } | |
| 69 /* This is now endian dependent */ | |
| 70 #if ( SDL_BYTEORDER == SDL_LIL_ENDIAN ) | |
| 71 #define HI 1 | |
| 72 #define LO 0 | |
| 73 #else /* ( SDL_BYTEORDER == SDL_BIG_ENDIAN ) */ | |
| 74 #define HI 0 | |
| 75 #define LO 1 | |
| 76 #endif | |
| 77 static void Blit1to2(SDL_BlitInfo *info) | |
| 78 { | |
| 79 #ifndef USE_DUFFS_LOOP | |
| 80 int c; | |
| 81 #endif | |
| 82 int width, height; | |
| 83 Uint8 *src, *dst; | |
| 84 Uint16 *map; | |
| 85 int srcskip, dstskip; | |
| 86 | |
| 87 /* Set up some basic variables */ | |
| 88 width = info->d_width; | |
| 89 height = info->d_height; | |
| 90 src = info->s_pixels; | |
| 91 srcskip = info->s_skip; | |
| 92 dst = info->d_pixels; | |
| 93 dstskip = info->d_skip; | |
| 94 map = (Uint16 *)info->table; | |
| 95 | |
| 96 #ifdef USE_DUFFS_LOOP | |
| 97 while ( height-- ) { | |
| 98 DUFFS_LOOP( | |
| 99 { | |
| 100 *(Uint16 *)dst = map[*src++]; | |
| 101 dst += 2; | |
| 102 }, | |
| 103 width); | |
| 104 src += srcskip; | |
| 105 dst += dstskip; | |
| 106 } | |
| 107 #else | |
| 108 /* Memory align at 4-byte boundary, if necessary */ | |
| 109 if ( (long)dst & 0x03 ) { | |
| 110 /* Don't do anything if width is 0 */ | |
| 111 if ( width == 0 ) { | |
| 112 return; | |
| 113 } | |
| 114 --width; | |
| 115 | |
| 116 while ( height-- ) { | |
| 117 /* Perform copy alignment */ | |
| 118 *(Uint16 *)dst = map[*src++]; | |
| 119 dst += 2; | |
| 120 | |
| 121 /* Copy in 4 pixel chunks */ | |
| 122 for ( c=width/4; c; --c ) { | |
| 123 *(Uint32 *)dst = | |
| 124 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 125 src += 2; | |
| 126 dst += 4; | |
| 127 *(Uint32 *)dst = | |
| 128 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 129 src += 2; | |
| 130 dst += 4; | |
| 131 } | |
| 132 /* Get any leftovers */ | |
|
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Sam Lantinga <slouken@lokigames.com>
parents:
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changeset
|
133 switch (width & 3) { |
| 0 | 134 case 3: |
| 135 *(Uint16 *)dst = map[*src++]; | |
| 136 dst += 2; | |
| 137 case 2: | |
| 138 *(Uint32 *)dst = | |
| 139 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 140 src += 2; | |
| 141 dst += 4; | |
| 142 break; | |
| 143 case 1: | |
| 144 *(Uint16 *)dst = map[*src++]; | |
| 145 dst += 2; | |
| 146 break; | |
| 147 } | |
| 148 src += srcskip; | |
| 149 dst += dstskip; | |
| 150 } | |
| 151 } else { | |
| 152 while ( height-- ) { | |
| 153 /* Copy in 4 pixel chunks */ | |
| 154 for ( c=width/4; c; --c ) { | |
| 155 *(Uint32 *)dst = | |
| 156 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 157 src += 2; | |
| 158 dst += 4; | |
| 159 *(Uint32 *)dst = | |
| 160 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 161 src += 2; | |
| 162 dst += 4; | |
| 163 } | |
| 164 /* Get any leftovers */ | |
|
91
e85e03f195b4
From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
165 switch (width & 3) { |
| 0 | 166 case 3: |
| 167 *(Uint16 *)dst = map[*src++]; | |
| 168 dst += 2; | |
| 169 case 2: | |
| 170 *(Uint32 *)dst = | |
| 171 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 172 src += 2; | |
| 173 dst += 4; | |
| 174 break; | |
| 175 case 1: | |
| 176 *(Uint16 *)dst = map[*src++]; | |
| 177 dst += 2; | |
| 178 break; | |
| 179 } | |
| 180 src += srcskip; | |
| 181 dst += dstskip; | |
| 182 } | |
| 183 } | |
| 184 #endif /* USE_DUFFS_LOOP */ | |
| 185 } | |
| 186 static void Blit1to3(SDL_BlitInfo *info) | |
| 187 { | |
| 188 #ifndef USE_DUFFS_LOOP | |
| 189 int c; | |
| 190 #endif | |
| 191 int o; | |
| 192 int width, height; | |
| 193 Uint8 *src, *map, *dst; | |
| 194 int srcskip, dstskip; | |
| 195 | |
| 196 /* Set up some basic variables */ | |
| 197 width = info->d_width; | |
| 198 height = info->d_height; | |
| 199 src = info->s_pixels; | |
| 200 srcskip = info->s_skip; | |
| 201 dst = info->d_pixels; | |
| 202 dstskip = info->d_skip; | |
| 203 map = info->table; | |
| 204 | |
| 205 while ( height-- ) { | |
| 206 #ifdef USE_DUFFS_LOOP | |
| 207 DUFFS_LOOP( | |
| 208 { | |
| 209 o = *src * 4; | |
| 210 dst[0] = map[o++]; | |
| 211 dst[1] = map[o++]; | |
| 212 dst[2] = map[o++]; | |
| 213 } | |
| 214 src++; | |
| 215 dst += 3; | |
| 216 , width); | |
| 217 #else | |
| 218 for ( c=width; c; --c ) { | |
| 219 o = *src * 4; | |
| 220 dst[0] = map[o++]; | |
| 221 dst[1] = map[o++]; | |
| 222 dst[2] = map[o++]; | |
| 223 src++; | |
| 224 dst += 3; | |
| 225 } | |
| 226 #endif /* USE_DUFFS_LOOP */ | |
| 227 src += srcskip; | |
| 228 dst += dstskip; | |
| 229 } | |
| 230 } | |
| 231 static void Blit1to4(SDL_BlitInfo *info) | |
| 232 { | |
| 233 #ifndef USE_DUFFS_LOOP | |
| 234 int c; | |
| 235 #endif | |
| 236 int width, height; | |
| 237 Uint8 *src; | |
| 238 Uint32 *map, *dst; | |
| 239 int srcskip, dstskip; | |
| 240 | |
| 241 /* Set up some basic variables */ | |
| 242 width = info->d_width; | |
| 243 height = info->d_height; | |
| 244 src = info->s_pixels; | |
| 245 srcskip = info->s_skip; | |
| 246 dst = (Uint32 *)info->d_pixels; | |
| 247 dstskip = info->d_skip/4; | |
| 248 map = (Uint32 *)info->table; | |
| 249 | |
| 250 while ( height-- ) { | |
| 251 #ifdef USE_DUFFS_LOOP | |
| 252 DUFFS_LOOP( | |
| 253 *dst++ = map[*src++]; | |
| 254 , width); | |
| 255 #else | |
| 256 for ( c=width/4; c; --c ) { | |
| 257 *dst++ = map[*src++]; | |
| 258 *dst++ = map[*src++]; | |
| 259 *dst++ = map[*src++]; | |
| 260 *dst++ = map[*src++]; | |
| 261 } | |
|
91
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From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
262 switch ( width & 3 ) { |
| 0 | 263 case 3: |
| 264 *dst++ = map[*src++]; | |
| 265 case 2: | |
| 266 *dst++ = map[*src++]; | |
| 267 case 1: | |
| 268 *dst++ = map[*src++]; | |
| 269 } | |
| 270 #endif /* USE_DUFFS_LOOP */ | |
| 271 src += srcskip; | |
| 272 dst += dstskip; | |
| 273 } | |
| 274 } | |
| 275 | |
| 276 static void Blit1to1Key(SDL_BlitInfo *info) | |
| 277 { | |
| 278 int width = info->d_width; | |
| 279 int height = info->d_height; | |
| 280 Uint8 *src = info->s_pixels; | |
| 281 int srcskip = info->s_skip; | |
| 282 Uint8 *dst = info->d_pixels; | |
| 283 int dstskip = info->d_skip; | |
| 284 Uint8 *palmap = info->table; | |
| 285 Uint32 ckey = info->src->colorkey; | |
| 286 | |
| 287 if ( palmap ) { | |
| 288 while ( height-- ) { | |
| 289 DUFFS_LOOP( | |
| 290 { | |
| 291 if ( *src != ckey ) { | |
| 292 *dst = palmap[*src]; | |
| 293 } | |
| 294 dst++; | |
| 295 src++; | |
| 296 }, | |
| 297 width); | |
| 298 src += srcskip; | |
| 299 dst += dstskip; | |
| 300 } | |
| 301 } else { | |
| 302 while ( height-- ) { | |
| 303 DUFFS_LOOP( | |
| 304 { | |
| 305 if ( *src != ckey ) { | |
| 306 *dst = *src; | |
| 307 } | |
| 308 dst++; | |
| 309 src++; | |
| 310 }, | |
| 311 width); | |
| 312 src += srcskip; | |
| 313 dst += dstskip; | |
| 314 } | |
| 315 } | |
| 316 } | |
| 317 | |
| 318 static void Blit1to2Key(SDL_BlitInfo *info) | |
| 319 { | |
| 320 int width = info->d_width; | |
| 321 int height = info->d_height; | |
| 322 Uint8 *src = info->s_pixels; | |
| 323 int srcskip = info->s_skip; | |
| 324 Uint16 *dstp = (Uint16 *)info->d_pixels; | |
| 325 int dstskip = info->d_skip; | |
| 326 Uint16 *palmap = (Uint16 *)info->table; | |
| 327 Uint32 ckey = info->src->colorkey; | |
| 328 | |
| 329 /* Set up some basic variables */ | |
| 330 dstskip /= 2; | |
| 331 | |
| 332 while ( height-- ) { | |
| 333 DUFFS_LOOP( | |
| 334 { | |
| 335 if ( *src != ckey ) { | |
| 336 *dstp=palmap[*src]; | |
| 337 } | |
| 338 src++; | |
| 339 dstp++; | |
| 340 }, | |
| 341 width); | |
| 342 src += srcskip; | |
| 343 dstp += dstskip; | |
| 344 } | |
| 345 } | |
| 346 | |
| 347 static void Blit1to3Key(SDL_BlitInfo *info) | |
| 348 { | |
| 349 int width = info->d_width; | |
| 350 int height = info->d_height; | |
| 351 Uint8 *src = info->s_pixels; | |
| 352 int srcskip = info->s_skip; | |
| 353 Uint8 *dst = info->d_pixels; | |
| 354 int dstskip = info->d_skip; | |
| 355 Uint8 *palmap = info->table; | |
| 356 Uint32 ckey = info->src->colorkey; | |
| 357 int o; | |
| 358 | |
| 359 while ( height-- ) { | |
| 360 DUFFS_LOOP( | |
| 361 { | |
| 362 if ( *src != ckey ) { | |
| 363 o = *src * 4; | |
| 364 dst[0] = palmap[o++]; | |
| 365 dst[1] = palmap[o++]; | |
| 366 dst[2] = palmap[o++]; | |
| 367 } | |
| 368 src++; | |
| 369 dst += 3; | |
| 370 }, | |
| 371 width); | |
| 372 src += srcskip; | |
| 373 dst += dstskip; | |
| 374 } | |
| 375 } | |
| 376 | |
| 377 static void Blit1to4Key(SDL_BlitInfo *info) | |
| 378 { | |
| 379 int width = info->d_width; | |
| 380 int height = info->d_height; | |
| 381 Uint8 *src = info->s_pixels; | |
| 382 int srcskip = info->s_skip; | |
| 383 Uint32 *dstp = (Uint32 *)info->d_pixels; | |
| 384 int dstskip = info->d_skip; | |
| 385 Uint32 *palmap = (Uint32 *)info->table; | |
| 386 Uint32 ckey = info->src->colorkey; | |
| 387 | |
| 388 /* Set up some basic variables */ | |
| 389 dstskip /= 4; | |
| 390 | |
| 391 while ( height-- ) { | |
| 392 DUFFS_LOOP( | |
| 393 { | |
| 394 if ( *src != ckey ) { | |
| 395 *dstp = palmap[*src]; | |
| 396 } | |
| 397 src++; | |
| 398 dstp++; | |
| 399 }, | |
| 400 width); | |
| 401 src += srcskip; | |
| 402 dstp += dstskip; | |
| 403 } | |
| 404 } | |
| 405 | |
| 406 static void Blit1toNAlpha(SDL_BlitInfo *info) | |
| 407 { | |
| 408 int width = info->d_width; | |
| 409 int height = info->d_height; | |
| 410 Uint8 *src = info->s_pixels; | |
| 411 int srcskip = info->s_skip; | |
| 412 Uint8 *dst = info->d_pixels; | |
| 413 int dstskip = info->d_skip; | |
| 414 SDL_PixelFormat *dstfmt = info->dst; | |
| 415 const SDL_Color *srcpal = info->src->palette->colors; | |
| 416 int dstbpp; | |
| 417 const int A = info->src->alpha; | |
| 418 | |
| 419 /* Set up some basic variables */ | |
| 420 dstbpp = dstfmt->BytesPerPixel; | |
| 421 | |
| 422 while ( height-- ) { | |
| 423 int sR, sG, sB; | |
| 424 int dR, dG, dB; | |
| 425 DUFFS_LOOP4( | |
| 426 { | |
| 427 Uint32 pixel; | |
| 428 sR = srcpal[*src].r; | |
| 429 sG = srcpal[*src].g; | |
| 430 sB = srcpal[*src].b; | |
| 431 DISEMBLE_RGB(dst, dstbpp, dstfmt, | |
| 432 pixel, dR, dG, dB); | |
| 433 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); | |
| 434 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB); | |
| 435 src++; | |
| 436 dst += dstbpp; | |
| 437 }, | |
| 438 width); | |
| 439 src += srcskip; | |
| 440 dst += dstskip; | |
| 441 } | |
| 442 } | |
| 443 | |
| 444 static void Blit1toNAlphaKey(SDL_BlitInfo *info) | |
| 445 { | |
| 446 int width = info->d_width; | |
| 447 int height = info->d_height; | |
| 448 Uint8 *src = info->s_pixels; | |
| 449 int srcskip = info->s_skip; | |
| 450 Uint8 *dst = info->d_pixels; | |
| 451 int dstskip = info->d_skip; | |
| 452 SDL_PixelFormat *srcfmt = info->src; | |
| 453 SDL_PixelFormat *dstfmt = info->dst; | |
| 454 const SDL_Color *srcpal = info->src->palette->colors; | |
| 455 Uint32 ckey = srcfmt->colorkey; | |
| 456 int dstbpp; | |
| 457 const int A = srcfmt->alpha; | |
| 458 | |
| 459 /* Set up some basic variables */ | |
| 460 dstbpp = dstfmt->BytesPerPixel; | |
| 461 | |
| 462 while ( height-- ) { | |
| 463 int sR, sG, sB; | |
| 464 int dR, dG, dB; | |
| 465 DUFFS_LOOP( | |
| 466 { | |
| 467 if ( *src != ckey ) { | |
| 468 Uint32 pixel; | |
| 469 sR = srcpal[*src].r; | |
| 470 sG = srcpal[*src].g; | |
| 471 sB = srcpal[*src].b; | |
| 472 DISEMBLE_RGB(dst, dstbpp, dstfmt, | |
| 473 pixel, dR, dG, dB); | |
| 474 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); | |
| 475 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB); | |
| 476 } | |
| 477 src++; | |
| 478 dst += dstbpp; | |
| 479 }, | |
| 480 width); | |
| 481 src += srcskip; | |
| 482 dst += dstskip; | |
| 483 } | |
| 484 } | |
| 485 | |
| 486 static SDL_loblit one_blit[] = { | |
| 487 NULL, Blit1to1, Blit1to2, Blit1to3, Blit1to4 | |
| 488 }; | |
| 489 | |
| 490 static SDL_loblit one_blitkey[] = { | |
| 491 NULL, Blit1to1Key, Blit1to2Key, Blit1to3Key, Blit1to4Key | |
| 492 }; | |
| 493 | |
| 494 SDL_loblit SDL_CalculateBlit1(SDL_Surface *surface, int blit_index) | |
| 495 { | |
| 496 int which; | |
| 497 SDL_PixelFormat *dstfmt; | |
| 498 | |
| 499 dstfmt = surface->map->dst->format; | |
| 500 if ( dstfmt->BitsPerPixel < 8 ) { | |
| 501 which = 0; | |
| 502 } else { | |
| 503 which = dstfmt->BytesPerPixel; | |
| 504 } | |
| 505 switch(blit_index) { | |
| 506 case 0: /* copy */ | |
| 507 return one_blit[which]; | |
| 508 | |
| 509 case 1: /* colorkey */ | |
| 510 return one_blitkey[which]; | |
| 511 | |
| 512 case 2: /* alpha */ | |
| 513 /* Supporting 8bpp->8bpp alpha is doable but requires lots of | |
| 514 tables which consume space and takes time to precompute, | |
| 515 so is better left to the user */ | |
| 516 return which >= 2 ? Blit1toNAlpha : NULL; | |
| 517 | |
| 518 case 3: /* alpha + colorkey */ | |
| 519 return which >= 2 ? Blit1toNAlphaKey : NULL; | |
| 520 | |
| 521 } | |
| 522 return NULL; | |
| 523 } |