Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit_1.c @ 1312:c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
I batch edited these files, so please let me know if I've accidentally removed anybody's
credit here.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 01 Feb 2006 06:32:25 +0000 |
| parents | b8d311d90021 |
| children | 450721ad5436 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
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 | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #include <stdio.h> | |
| 24 | |
| 25 #include "SDL_types.h" | |
| 26 #include "SDL_video.h" | |
| 27 #include "SDL_blit.h" | |
| 28 #include "SDL_sysvideo.h" | |
| 29 #include "SDL_endian.h" | |
| 30 | |
| 31 /* Functions to blit from 8-bit surfaces to other surfaces */ | |
| 32 | |
| 33 static void Blit1to1(SDL_BlitInfo *info) | |
| 34 { | |
| 35 #ifndef USE_DUFFS_LOOP | |
| 36 int c; | |
| 37 #endif | |
| 38 int width, height; | |
| 39 Uint8 *src, *map, *dst; | |
| 40 int srcskip, dstskip; | |
| 41 | |
| 42 /* Set up some basic variables */ | |
| 43 width = info->d_width; | |
| 44 height = info->d_height; | |
| 45 src = info->s_pixels; | |
| 46 srcskip = info->s_skip; | |
| 47 dst = info->d_pixels; | |
| 48 dstskip = info->d_skip; | |
| 49 map = info->table; | |
| 50 | |
| 51 while ( height-- ) { | |
| 52 #ifdef USE_DUFFS_LOOP | |
| 53 DUFFS_LOOP( | |
| 54 { | |
| 55 *dst = map[*src]; | |
| 56 } | |
| 57 dst++; | |
| 58 src++; | |
| 59 , width); | |
| 60 #else | |
| 61 for ( c=width; c; --c ) { | |
| 62 *dst = map[*src]; | |
| 63 dst++; | |
| 64 src++; | |
| 65 } | |
| 66 #endif | |
| 67 src += srcskip; | |
| 68 dst += dstskip; | |
| 69 } | |
| 70 } | |
| 71 /* This is now endian dependent */ | |
| 72 #if ( SDL_BYTEORDER == SDL_LIL_ENDIAN ) | |
| 73 #define HI 1 | |
| 74 #define LO 0 | |
| 75 #else /* ( SDL_BYTEORDER == SDL_BIG_ENDIAN ) */ | |
| 76 #define HI 0 | |
| 77 #define LO 1 | |
| 78 #endif | |
| 79 static void Blit1to2(SDL_BlitInfo *info) | |
| 80 { | |
| 81 #ifndef USE_DUFFS_LOOP | |
| 82 int c; | |
| 83 #endif | |
| 84 int width, height; | |
| 85 Uint8 *src, *dst; | |
| 86 Uint16 *map; | |
| 87 int srcskip, dstskip; | |
| 88 | |
| 89 /* Set up some basic variables */ | |
| 90 width = info->d_width; | |
| 91 height = info->d_height; | |
| 92 src = info->s_pixels; | |
| 93 srcskip = info->s_skip; | |
| 94 dst = info->d_pixels; | |
| 95 dstskip = info->d_skip; | |
| 96 map = (Uint16 *)info->table; | |
| 97 | |
| 98 #ifdef USE_DUFFS_LOOP | |
| 99 while ( height-- ) { | |
| 100 DUFFS_LOOP( | |
| 101 { | |
| 102 *(Uint16 *)dst = map[*src++]; | |
| 103 dst += 2; | |
| 104 }, | |
| 105 width); | |
| 106 src += srcskip; | |
| 107 dst += dstskip; | |
| 108 } | |
| 109 #else | |
| 110 /* Memory align at 4-byte boundary, if necessary */ | |
| 111 if ( (long)dst & 0x03 ) { | |
| 112 /* Don't do anything if width is 0 */ | |
| 113 if ( width == 0 ) { | |
| 114 return; | |
| 115 } | |
| 116 --width; | |
| 117 | |
| 118 while ( height-- ) { | |
| 119 /* Perform copy alignment */ | |
| 120 *(Uint16 *)dst = map[*src++]; | |
| 121 dst += 2; | |
| 122 | |
| 123 /* Copy in 4 pixel chunks */ | |
| 124 for ( c=width/4; c; --c ) { | |
| 125 *(Uint32 *)dst = | |
| 126 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 127 src += 2; | |
| 128 dst += 4; | |
| 129 *(Uint32 *)dst = | |
| 130 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 131 src += 2; | |
| 132 dst += 4; | |
| 133 } | |
| 134 /* Get any leftovers */ | |
|
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135 switch (width & 3) { |
| 0 | 136 case 3: |
| 137 *(Uint16 *)dst = map[*src++]; | |
| 138 dst += 2; | |
| 139 case 2: | |
| 140 *(Uint32 *)dst = | |
| 141 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 142 src += 2; | |
| 143 dst += 4; | |
| 144 break; | |
| 145 case 1: | |
| 146 *(Uint16 *)dst = map[*src++]; | |
| 147 dst += 2; | |
| 148 break; | |
| 149 } | |
| 150 src += srcskip; | |
| 151 dst += dstskip; | |
| 152 } | |
| 153 } else { | |
| 154 while ( height-- ) { | |
| 155 /* Copy in 4 pixel chunks */ | |
| 156 for ( c=width/4; c; --c ) { | |
| 157 *(Uint32 *)dst = | |
| 158 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 159 src += 2; | |
| 160 dst += 4; | |
| 161 *(Uint32 *)dst = | |
| 162 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 163 src += 2; | |
| 164 dst += 4; | |
| 165 } | |
| 166 /* Get any leftovers */ | |
|
91
e85e03f195b4
From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
167 switch (width & 3) { |
| 0 | 168 case 3: |
| 169 *(Uint16 *)dst = map[*src++]; | |
| 170 dst += 2; | |
| 171 case 2: | |
| 172 *(Uint32 *)dst = | |
| 173 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 174 src += 2; | |
| 175 dst += 4; | |
| 176 break; | |
| 177 case 1: | |
| 178 *(Uint16 *)dst = map[*src++]; | |
| 179 dst += 2; | |
| 180 break; | |
| 181 } | |
| 182 src += srcskip; | |
| 183 dst += dstskip; | |
| 184 } | |
| 185 } | |
| 186 #endif /* USE_DUFFS_LOOP */ | |
| 187 } | |
| 188 static void Blit1to3(SDL_BlitInfo *info) | |
| 189 { | |
| 190 #ifndef USE_DUFFS_LOOP | |
| 191 int c; | |
| 192 #endif | |
| 193 int o; | |
| 194 int width, height; | |
| 195 Uint8 *src, *map, *dst; | |
| 196 int srcskip, dstskip; | |
| 197 | |
| 198 /* Set up some basic variables */ | |
| 199 width = info->d_width; | |
| 200 height = info->d_height; | |
| 201 src = info->s_pixels; | |
| 202 srcskip = info->s_skip; | |
| 203 dst = info->d_pixels; | |
| 204 dstskip = info->d_skip; | |
| 205 map = info->table; | |
| 206 | |
| 207 while ( height-- ) { | |
| 208 #ifdef USE_DUFFS_LOOP | |
| 209 DUFFS_LOOP( | |
| 210 { | |
| 211 o = *src * 4; | |
| 212 dst[0] = map[o++]; | |
| 213 dst[1] = map[o++]; | |
| 214 dst[2] = map[o++]; | |
| 215 } | |
| 216 src++; | |
| 217 dst += 3; | |
| 218 , width); | |
| 219 #else | |
| 220 for ( c=width; c; --c ) { | |
| 221 o = *src * 4; | |
| 222 dst[0] = map[o++]; | |
| 223 dst[1] = map[o++]; | |
| 224 dst[2] = map[o++]; | |
| 225 src++; | |
| 226 dst += 3; | |
| 227 } | |
| 228 #endif /* USE_DUFFS_LOOP */ | |
| 229 src += srcskip; | |
| 230 dst += dstskip; | |
| 231 } | |
| 232 } | |
| 233 static void Blit1to4(SDL_BlitInfo *info) | |
| 234 { | |
| 235 #ifndef USE_DUFFS_LOOP | |
| 236 int c; | |
| 237 #endif | |
| 238 int width, height; | |
| 239 Uint8 *src; | |
| 240 Uint32 *map, *dst; | |
| 241 int srcskip, dstskip; | |
| 242 | |
| 243 /* Set up some basic variables */ | |
| 244 width = info->d_width; | |
| 245 height = info->d_height; | |
| 246 src = info->s_pixels; | |
| 247 srcskip = info->s_skip; | |
| 248 dst = (Uint32 *)info->d_pixels; | |
| 249 dstskip = info->d_skip/4; | |
| 250 map = (Uint32 *)info->table; | |
| 251 | |
| 252 while ( height-- ) { | |
| 253 #ifdef USE_DUFFS_LOOP | |
| 254 DUFFS_LOOP( | |
| 255 *dst++ = map[*src++]; | |
| 256 , width); | |
| 257 #else | |
| 258 for ( c=width/4; c; --c ) { | |
| 259 *dst++ = map[*src++]; | |
| 260 *dst++ = map[*src++]; | |
| 261 *dst++ = map[*src++]; | |
| 262 *dst++ = map[*src++]; | |
| 263 } | |
|
91
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From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
264 switch ( width & 3 ) { |
| 0 | 265 case 3: |
| 266 *dst++ = map[*src++]; | |
| 267 case 2: | |
| 268 *dst++ = map[*src++]; | |
| 269 case 1: | |
| 270 *dst++ = map[*src++]; | |
| 271 } | |
| 272 #endif /* USE_DUFFS_LOOP */ | |
| 273 src += srcskip; | |
| 274 dst += dstskip; | |
| 275 } | |
| 276 } | |
| 277 | |
| 278 static void Blit1to1Key(SDL_BlitInfo *info) | |
| 279 { | |
| 280 int width = info->d_width; | |
| 281 int height = info->d_height; | |
| 282 Uint8 *src = info->s_pixels; | |
| 283 int srcskip = info->s_skip; | |
| 284 Uint8 *dst = info->d_pixels; | |
| 285 int dstskip = info->d_skip; | |
| 286 Uint8 *palmap = info->table; | |
| 287 Uint32 ckey = info->src->colorkey; | |
| 288 | |
| 289 if ( palmap ) { | |
| 290 while ( height-- ) { | |
| 291 DUFFS_LOOP( | |
| 292 { | |
| 293 if ( *src != ckey ) { | |
| 294 *dst = palmap[*src]; | |
| 295 } | |
| 296 dst++; | |
| 297 src++; | |
| 298 }, | |
| 299 width); | |
| 300 src += srcskip; | |
| 301 dst += dstskip; | |
| 302 } | |
| 303 } else { | |
| 304 while ( height-- ) { | |
| 305 DUFFS_LOOP( | |
| 306 { | |
| 307 if ( *src != ckey ) { | |
| 308 *dst = *src; | |
| 309 } | |
| 310 dst++; | |
| 311 src++; | |
| 312 }, | |
| 313 width); | |
| 314 src += srcskip; | |
| 315 dst += dstskip; | |
| 316 } | |
| 317 } | |
| 318 } | |
| 319 | |
| 320 static void Blit1to2Key(SDL_BlitInfo *info) | |
| 321 { | |
| 322 int width = info->d_width; | |
| 323 int height = info->d_height; | |
| 324 Uint8 *src = info->s_pixels; | |
| 325 int srcskip = info->s_skip; | |
| 326 Uint16 *dstp = (Uint16 *)info->d_pixels; | |
| 327 int dstskip = info->d_skip; | |
| 328 Uint16 *palmap = (Uint16 *)info->table; | |
| 329 Uint32 ckey = info->src->colorkey; | |
| 330 | |
| 331 /* Set up some basic variables */ | |
| 332 dstskip /= 2; | |
| 333 | |
| 334 while ( height-- ) { | |
| 335 DUFFS_LOOP( | |
| 336 { | |
| 337 if ( *src != ckey ) { | |
| 338 *dstp=palmap[*src]; | |
| 339 } | |
| 340 src++; | |
| 341 dstp++; | |
| 342 }, | |
| 343 width); | |
| 344 src += srcskip; | |
| 345 dstp += dstskip; | |
| 346 } | |
| 347 } | |
| 348 | |
| 349 static void Blit1to3Key(SDL_BlitInfo *info) | |
| 350 { | |
| 351 int width = info->d_width; | |
| 352 int height = info->d_height; | |
| 353 Uint8 *src = info->s_pixels; | |
| 354 int srcskip = info->s_skip; | |
| 355 Uint8 *dst = info->d_pixels; | |
| 356 int dstskip = info->d_skip; | |
| 357 Uint8 *palmap = info->table; | |
| 358 Uint32 ckey = info->src->colorkey; | |
| 359 int o; | |
| 360 | |
| 361 while ( height-- ) { | |
| 362 DUFFS_LOOP( | |
| 363 { | |
| 364 if ( *src != ckey ) { | |
| 365 o = *src * 4; | |
| 366 dst[0] = palmap[o++]; | |
| 367 dst[1] = palmap[o++]; | |
| 368 dst[2] = palmap[o++]; | |
| 369 } | |
| 370 src++; | |
| 371 dst += 3; | |
| 372 }, | |
| 373 width); | |
| 374 src += srcskip; | |
| 375 dst += dstskip; | |
| 376 } | |
| 377 } | |
| 378 | |
| 379 static void Blit1to4Key(SDL_BlitInfo *info) | |
| 380 { | |
| 381 int width = info->d_width; | |
| 382 int height = info->d_height; | |
| 383 Uint8 *src = info->s_pixels; | |
| 384 int srcskip = info->s_skip; | |
| 385 Uint32 *dstp = (Uint32 *)info->d_pixels; | |
| 386 int dstskip = info->d_skip; | |
| 387 Uint32 *palmap = (Uint32 *)info->table; | |
| 388 Uint32 ckey = info->src->colorkey; | |
| 389 | |
| 390 /* Set up some basic variables */ | |
| 391 dstskip /= 4; | |
| 392 | |
| 393 while ( height-- ) { | |
| 394 DUFFS_LOOP( | |
| 395 { | |
| 396 if ( *src != ckey ) { | |
| 397 *dstp = palmap[*src]; | |
| 398 } | |
| 399 src++; | |
| 400 dstp++; | |
| 401 }, | |
| 402 width); | |
| 403 src += srcskip; | |
| 404 dstp += dstskip; | |
| 405 } | |
| 406 } | |
| 407 | |
| 408 static void Blit1toNAlpha(SDL_BlitInfo *info) | |
| 409 { | |
| 410 int width = info->d_width; | |
| 411 int height = info->d_height; | |
| 412 Uint8 *src = info->s_pixels; | |
| 413 int srcskip = info->s_skip; | |
| 414 Uint8 *dst = info->d_pixels; | |
| 415 int dstskip = info->d_skip; | |
| 416 SDL_PixelFormat *dstfmt = info->dst; | |
| 417 const SDL_Color *srcpal = info->src->palette->colors; | |
| 418 int dstbpp; | |
| 419 const int A = info->src->alpha; | |
| 420 | |
| 421 /* Set up some basic variables */ | |
| 422 dstbpp = dstfmt->BytesPerPixel; | |
| 423 | |
| 424 while ( height-- ) { | |
| 425 int sR, sG, sB; | |
| 426 int dR, dG, dB; | |
| 427 DUFFS_LOOP4( | |
| 428 { | |
| 429 Uint32 pixel; | |
| 430 sR = srcpal[*src].r; | |
| 431 sG = srcpal[*src].g; | |
| 432 sB = srcpal[*src].b; | |
| 433 DISEMBLE_RGB(dst, dstbpp, dstfmt, | |
| 434 pixel, dR, dG, dB); | |
| 435 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); | |
| 436 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB); | |
| 437 src++; | |
| 438 dst += dstbpp; | |
| 439 }, | |
| 440 width); | |
| 441 src += srcskip; | |
| 442 dst += dstskip; | |
| 443 } | |
| 444 } | |
| 445 | |
| 446 static void Blit1toNAlphaKey(SDL_BlitInfo *info) | |
| 447 { | |
| 448 int width = info->d_width; | |
| 449 int height = info->d_height; | |
| 450 Uint8 *src = info->s_pixels; | |
| 451 int srcskip = info->s_skip; | |
| 452 Uint8 *dst = info->d_pixels; | |
| 453 int dstskip = info->d_skip; | |
| 454 SDL_PixelFormat *srcfmt = info->src; | |
| 455 SDL_PixelFormat *dstfmt = info->dst; | |
| 456 const SDL_Color *srcpal = info->src->palette->colors; | |
| 457 Uint32 ckey = srcfmt->colorkey; | |
| 458 int dstbpp; | |
| 459 const int A = srcfmt->alpha; | |
| 460 | |
| 461 /* Set up some basic variables */ | |
| 462 dstbpp = dstfmt->BytesPerPixel; | |
| 463 | |
| 464 while ( height-- ) { | |
| 465 int sR, sG, sB; | |
| 466 int dR, dG, dB; | |
| 467 DUFFS_LOOP( | |
| 468 { | |
| 469 if ( *src != ckey ) { | |
| 470 Uint32 pixel; | |
| 471 sR = srcpal[*src].r; | |
| 472 sG = srcpal[*src].g; | |
| 473 sB = srcpal[*src].b; | |
| 474 DISEMBLE_RGB(dst, dstbpp, dstfmt, | |
| 475 pixel, dR, dG, dB); | |
| 476 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); | |
| 477 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB); | |
| 478 } | |
| 479 src++; | |
| 480 dst += dstbpp; | |
| 481 }, | |
| 482 width); | |
| 483 src += srcskip; | |
| 484 dst += dstskip; | |
| 485 } | |
| 486 } | |
| 487 | |
| 488 static SDL_loblit one_blit[] = { | |
| 489 NULL, Blit1to1, Blit1to2, Blit1to3, Blit1to4 | |
| 490 }; | |
| 491 | |
| 492 static SDL_loblit one_blitkey[] = { | |
| 493 NULL, Blit1to1Key, Blit1to2Key, Blit1to3Key, Blit1to4Key | |
| 494 }; | |
| 495 | |
| 496 SDL_loblit SDL_CalculateBlit1(SDL_Surface *surface, int blit_index) | |
| 497 { | |
| 498 int which; | |
| 499 SDL_PixelFormat *dstfmt; | |
| 500 | |
| 501 dstfmt = surface->map->dst->format; | |
| 502 if ( dstfmt->BitsPerPixel < 8 ) { | |
| 503 which = 0; | |
| 504 } else { | |
| 505 which = dstfmt->BytesPerPixel; | |
| 506 } | |
| 507 switch(blit_index) { | |
| 508 case 0: /* copy */ | |
| 509 return one_blit[which]; | |
| 510 | |
| 511 case 1: /* colorkey */ | |
| 512 return one_blitkey[which]; | |
| 513 | |
| 514 case 2: /* alpha */ | |
| 515 /* Supporting 8bpp->8bpp alpha is doable but requires lots of | |
| 516 tables which consume space and takes time to precompute, | |
| 517 so is better left to the user */ | |
| 518 return which >= 2 ? Blit1toNAlpha : NULL; | |
| 519 | |
| 520 case 3: /* alpha + colorkey */ | |
| 521 return which >= 2 ? Blit1toNAlphaKey : NULL; | |
| 522 | |
| 523 } | |
| 524 return NULL; | |
| 525 } |