Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit_1.c @ 156:7064032cbe77
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 20 Aug 2001 00:10:35 +0000 |
| parents | e85e03f195b4 |
| children | e8157fcb3114 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga | |
| 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 | |
| 20 slouken@devolution.com | |
| 21 */ | |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 #include <stdio.h> | |
| 29 | |
| 30 #include "SDL_types.h" | |
| 31 #include "SDL_video.h" | |
| 32 #include "SDL_blit.h" | |
| 33 #include "SDL_sysvideo.h" | |
| 34 #include "SDL_endian.h" | |
| 35 | |
| 36 /* Functions to blit from 8-bit surfaces to other surfaces */ | |
| 37 | |
| 38 static void Blit1to1(SDL_BlitInfo *info) | |
| 39 { | |
| 40 #ifndef USE_DUFFS_LOOP | |
| 41 int c; | |
| 42 #endif | |
| 43 int width, height; | |
| 44 Uint8 *src, *map, *dst; | |
| 45 int srcskip, dstskip; | |
| 46 | |
| 47 /* Set up some basic variables */ | |
| 48 width = info->d_width; | |
| 49 height = info->d_height; | |
| 50 src = info->s_pixels; | |
| 51 srcskip = info->s_skip; | |
| 52 dst = info->d_pixels; | |
| 53 dstskip = info->d_skip; | |
| 54 map = info->table; | |
| 55 | |
| 56 while ( height-- ) { | |
| 57 #ifdef USE_DUFFS_LOOP | |
| 58 DUFFS_LOOP( | |
| 59 { | |
| 60 *dst = map[*src]; | |
| 61 } | |
| 62 dst++; | |
| 63 src++; | |
| 64 , width); | |
| 65 #else | |
| 66 for ( c=width; c; --c ) { | |
| 67 *dst = map[*src]; | |
| 68 dst++; | |
| 69 src++; | |
| 70 } | |
| 71 #endif | |
| 72 src += srcskip; | |
| 73 dst += dstskip; | |
| 74 } | |
| 75 } | |
| 76 /* This is now endian dependent */ | |
| 77 #if ( SDL_BYTEORDER == SDL_LIL_ENDIAN ) | |
| 78 #define HI 1 | |
| 79 #define LO 0 | |
| 80 #else /* ( SDL_BYTEORDER == SDL_BIG_ENDIAN ) */ | |
| 81 #define HI 0 | |
| 82 #define LO 1 | |
| 83 #endif | |
| 84 static void Blit1to2(SDL_BlitInfo *info) | |
| 85 { | |
| 86 #ifndef USE_DUFFS_LOOP | |
| 87 int c; | |
| 88 #endif | |
| 89 int width, height; | |
| 90 Uint8 *src, *dst; | |
| 91 Uint16 *map; | |
| 92 int srcskip, dstskip; | |
| 93 | |
| 94 /* Set up some basic variables */ | |
| 95 width = info->d_width; | |
| 96 height = info->d_height; | |
| 97 src = info->s_pixels; | |
| 98 srcskip = info->s_skip; | |
| 99 dst = info->d_pixels; | |
| 100 dstskip = info->d_skip; | |
| 101 map = (Uint16 *)info->table; | |
| 102 | |
| 103 #ifdef USE_DUFFS_LOOP | |
| 104 while ( height-- ) { | |
| 105 DUFFS_LOOP( | |
| 106 { | |
| 107 *(Uint16 *)dst = map[*src++]; | |
| 108 dst += 2; | |
| 109 }, | |
| 110 width); | |
| 111 src += srcskip; | |
| 112 dst += dstskip; | |
| 113 } | |
| 114 #else | |
| 115 /* Memory align at 4-byte boundary, if necessary */ | |
| 116 if ( (long)dst & 0x03 ) { | |
| 117 /* Don't do anything if width is 0 */ | |
| 118 if ( width == 0 ) { | |
| 119 return; | |
| 120 } | |
| 121 --width; | |
| 122 | |
| 123 while ( height-- ) { | |
| 124 /* Perform copy alignment */ | |
| 125 *(Uint16 *)dst = map[*src++]; | |
| 126 dst += 2; | |
| 127 | |
| 128 /* Copy in 4 pixel chunks */ | |
| 129 for ( c=width/4; c; --c ) { | |
| 130 *(Uint32 *)dst = | |
| 131 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 132 src += 2; | |
| 133 dst += 4; | |
| 134 *(Uint32 *)dst = | |
| 135 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 136 src += 2; | |
| 137 dst += 4; | |
| 138 } | |
| 139 /* Get any leftovers */ | |
|
91
e85e03f195b4
From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
140 switch (width & 3) { |
| 0 | 141 case 3: |
| 142 *(Uint16 *)dst = map[*src++]; | |
| 143 dst += 2; | |
| 144 case 2: | |
| 145 *(Uint32 *)dst = | |
| 146 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 147 src += 2; | |
| 148 dst += 4; | |
| 149 break; | |
| 150 case 1: | |
| 151 *(Uint16 *)dst = map[*src++]; | |
| 152 dst += 2; | |
| 153 break; | |
| 154 } | |
| 155 src += srcskip; | |
| 156 dst += dstskip; | |
| 157 } | |
| 158 } else { | |
| 159 while ( height-- ) { | |
| 160 /* Copy in 4 pixel chunks */ | |
| 161 for ( c=width/4; c; --c ) { | |
| 162 *(Uint32 *)dst = | |
| 163 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 164 src += 2; | |
| 165 dst += 4; | |
| 166 *(Uint32 *)dst = | |
| 167 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 168 src += 2; | |
| 169 dst += 4; | |
| 170 } | |
| 171 /* Get any leftovers */ | |
|
91
e85e03f195b4
From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
172 switch (width & 3) { |
| 0 | 173 case 3: |
| 174 *(Uint16 *)dst = map[*src++]; | |
| 175 dst += 2; | |
| 176 case 2: | |
| 177 *(Uint32 *)dst = | |
| 178 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 179 src += 2; | |
| 180 dst += 4; | |
| 181 break; | |
| 182 case 1: | |
| 183 *(Uint16 *)dst = map[*src++]; | |
| 184 dst += 2; | |
| 185 break; | |
| 186 } | |
| 187 src += srcskip; | |
| 188 dst += dstskip; | |
| 189 } | |
| 190 } | |
| 191 #endif /* USE_DUFFS_LOOP */ | |
| 192 } | |
| 193 static void Blit1to3(SDL_BlitInfo *info) | |
| 194 { | |
| 195 #ifndef USE_DUFFS_LOOP | |
| 196 int c; | |
| 197 #endif | |
| 198 int o; | |
| 199 int width, height; | |
| 200 Uint8 *src, *map, *dst; | |
| 201 int srcskip, dstskip; | |
| 202 | |
| 203 /* Set up some basic variables */ | |
| 204 width = info->d_width; | |
| 205 height = info->d_height; | |
| 206 src = info->s_pixels; | |
| 207 srcskip = info->s_skip; | |
| 208 dst = info->d_pixels; | |
| 209 dstskip = info->d_skip; | |
| 210 map = info->table; | |
| 211 | |
| 212 while ( height-- ) { | |
| 213 #ifdef USE_DUFFS_LOOP | |
| 214 DUFFS_LOOP( | |
| 215 { | |
| 216 o = *src * 4; | |
| 217 dst[0] = map[o++]; | |
| 218 dst[1] = map[o++]; | |
| 219 dst[2] = map[o++]; | |
| 220 } | |
| 221 src++; | |
| 222 dst += 3; | |
| 223 , width); | |
| 224 #else | |
| 225 for ( c=width; c; --c ) { | |
| 226 o = *src * 4; | |
| 227 dst[0] = map[o++]; | |
| 228 dst[1] = map[o++]; | |
| 229 dst[2] = map[o++]; | |
| 230 src++; | |
| 231 dst += 3; | |
| 232 } | |
| 233 #endif /* USE_DUFFS_LOOP */ | |
| 234 src += srcskip; | |
| 235 dst += dstskip; | |
| 236 } | |
| 237 } | |
| 238 static void Blit1to4(SDL_BlitInfo *info) | |
| 239 { | |
| 240 #ifndef USE_DUFFS_LOOP | |
| 241 int c; | |
| 242 #endif | |
| 243 int width, height; | |
| 244 Uint8 *src; | |
| 245 Uint32 *map, *dst; | |
| 246 int srcskip, dstskip; | |
| 247 | |
| 248 /* Set up some basic variables */ | |
| 249 width = info->d_width; | |
| 250 height = info->d_height; | |
| 251 src = info->s_pixels; | |
| 252 srcskip = info->s_skip; | |
| 253 dst = (Uint32 *)info->d_pixels; | |
| 254 dstskip = info->d_skip/4; | |
| 255 map = (Uint32 *)info->table; | |
| 256 | |
| 257 while ( height-- ) { | |
| 258 #ifdef USE_DUFFS_LOOP | |
| 259 DUFFS_LOOP( | |
| 260 *dst++ = map[*src++]; | |
| 261 , width); | |
| 262 #else | |
| 263 for ( c=width/4; c; --c ) { | |
| 264 *dst++ = map[*src++]; | |
| 265 *dst++ = map[*src++]; | |
| 266 *dst++ = map[*src++]; | |
| 267 *dst++ = map[*src++]; | |
| 268 } | |
|
91
e85e03f195b4
From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
269 switch ( width & 3 ) { |
| 0 | 270 case 3: |
| 271 *dst++ = map[*src++]; | |
| 272 case 2: | |
| 273 *dst++ = map[*src++]; | |
| 274 case 1: | |
| 275 *dst++ = map[*src++]; | |
| 276 } | |
| 277 #endif /* USE_DUFFS_LOOP */ | |
| 278 src += srcskip; | |
| 279 dst += dstskip; | |
| 280 } | |
| 281 } | |
| 282 | |
| 283 static void Blit1to1Key(SDL_BlitInfo *info) | |
| 284 { | |
| 285 int width = info->d_width; | |
| 286 int height = info->d_height; | |
| 287 Uint8 *src = info->s_pixels; | |
| 288 int srcskip = info->s_skip; | |
| 289 Uint8 *dst = info->d_pixels; | |
| 290 int dstskip = info->d_skip; | |
| 291 Uint8 *palmap = info->table; | |
| 292 Uint32 ckey = info->src->colorkey; | |
| 293 | |
| 294 if ( palmap ) { | |
| 295 while ( height-- ) { | |
| 296 DUFFS_LOOP( | |
| 297 { | |
| 298 if ( *src != ckey ) { | |
| 299 *dst = palmap[*src]; | |
| 300 } | |
| 301 dst++; | |
| 302 src++; | |
| 303 }, | |
| 304 width); | |
| 305 src += srcskip; | |
| 306 dst += dstskip; | |
| 307 } | |
| 308 } else { | |
| 309 while ( height-- ) { | |
| 310 DUFFS_LOOP( | |
| 311 { | |
| 312 if ( *src != ckey ) { | |
| 313 *dst = *src; | |
| 314 } | |
| 315 dst++; | |
| 316 src++; | |
| 317 }, | |
| 318 width); | |
| 319 src += srcskip; | |
| 320 dst += dstskip; | |
| 321 } | |
| 322 } | |
| 323 } | |
| 324 | |
| 325 static void Blit1to2Key(SDL_BlitInfo *info) | |
| 326 { | |
| 327 int width = info->d_width; | |
| 328 int height = info->d_height; | |
| 329 Uint8 *src = info->s_pixels; | |
| 330 int srcskip = info->s_skip; | |
| 331 Uint16 *dstp = (Uint16 *)info->d_pixels; | |
| 332 int dstskip = info->d_skip; | |
| 333 Uint16 *palmap = (Uint16 *)info->table; | |
| 334 Uint32 ckey = info->src->colorkey; | |
| 335 | |
| 336 /* Set up some basic variables */ | |
| 337 dstskip /= 2; | |
| 338 | |
| 339 while ( height-- ) { | |
| 340 DUFFS_LOOP( | |
| 341 { | |
| 342 if ( *src != ckey ) { | |
| 343 *dstp=palmap[*src]; | |
| 344 } | |
| 345 src++; | |
| 346 dstp++; | |
| 347 }, | |
| 348 width); | |
| 349 src += srcskip; | |
| 350 dstp += dstskip; | |
| 351 } | |
| 352 } | |
| 353 | |
| 354 static void Blit1to3Key(SDL_BlitInfo *info) | |
| 355 { | |
| 356 int width = info->d_width; | |
| 357 int height = info->d_height; | |
| 358 Uint8 *src = info->s_pixels; | |
| 359 int srcskip = info->s_skip; | |
| 360 Uint8 *dst = info->d_pixels; | |
| 361 int dstskip = info->d_skip; | |
| 362 Uint8 *palmap = info->table; | |
| 363 Uint32 ckey = info->src->colorkey; | |
| 364 int o; | |
| 365 | |
| 366 while ( height-- ) { | |
| 367 DUFFS_LOOP( | |
| 368 { | |
| 369 if ( *src != ckey ) { | |
| 370 o = *src * 4; | |
| 371 dst[0] = palmap[o++]; | |
| 372 dst[1] = palmap[o++]; | |
| 373 dst[2] = palmap[o++]; | |
| 374 } | |
| 375 src++; | |
| 376 dst += 3; | |
| 377 }, | |
| 378 width); | |
| 379 src += srcskip; | |
| 380 dst += dstskip; | |
| 381 } | |
| 382 } | |
| 383 | |
| 384 static void Blit1to4Key(SDL_BlitInfo *info) | |
| 385 { | |
| 386 int width = info->d_width; | |
| 387 int height = info->d_height; | |
| 388 Uint8 *src = info->s_pixels; | |
| 389 int srcskip = info->s_skip; | |
| 390 Uint32 *dstp = (Uint32 *)info->d_pixels; | |
| 391 int dstskip = info->d_skip; | |
| 392 Uint32 *palmap = (Uint32 *)info->table; | |
| 393 Uint32 ckey = info->src->colorkey; | |
| 394 | |
| 395 /* Set up some basic variables */ | |
| 396 dstskip /= 4; | |
| 397 | |
| 398 while ( height-- ) { | |
| 399 DUFFS_LOOP( | |
| 400 { | |
| 401 if ( *src != ckey ) { | |
| 402 *dstp = palmap[*src]; | |
| 403 } | |
| 404 src++; | |
| 405 dstp++; | |
| 406 }, | |
| 407 width); | |
| 408 src += srcskip; | |
| 409 dstp += dstskip; | |
| 410 } | |
| 411 } | |
| 412 | |
| 413 static void Blit1toNAlpha(SDL_BlitInfo *info) | |
| 414 { | |
| 415 int width = info->d_width; | |
| 416 int height = info->d_height; | |
| 417 Uint8 *src = info->s_pixels; | |
| 418 int srcskip = info->s_skip; | |
| 419 Uint8 *dst = info->d_pixels; | |
| 420 int dstskip = info->d_skip; | |
| 421 SDL_PixelFormat *dstfmt = info->dst; | |
| 422 const SDL_Color *srcpal = info->src->palette->colors; | |
| 423 int dstbpp; | |
| 424 const int A = info->src->alpha; | |
| 425 | |
| 426 /* Set up some basic variables */ | |
| 427 dstbpp = dstfmt->BytesPerPixel; | |
| 428 | |
| 429 while ( height-- ) { | |
| 430 int sR, sG, sB; | |
| 431 int dR, dG, dB; | |
| 432 DUFFS_LOOP4( | |
| 433 { | |
| 434 Uint32 pixel; | |
| 435 sR = srcpal[*src].r; | |
| 436 sG = srcpal[*src].g; | |
| 437 sB = srcpal[*src].b; | |
| 438 DISEMBLE_RGB(dst, dstbpp, dstfmt, | |
| 439 pixel, dR, dG, dB); | |
| 440 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); | |
| 441 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB); | |
| 442 src++; | |
| 443 dst += dstbpp; | |
| 444 }, | |
| 445 width); | |
| 446 src += srcskip; | |
| 447 dst += dstskip; | |
| 448 } | |
| 449 } | |
| 450 | |
| 451 static void Blit1toNAlphaKey(SDL_BlitInfo *info) | |
| 452 { | |
| 453 int width = info->d_width; | |
| 454 int height = info->d_height; | |
| 455 Uint8 *src = info->s_pixels; | |
| 456 int srcskip = info->s_skip; | |
| 457 Uint8 *dst = info->d_pixels; | |
| 458 int dstskip = info->d_skip; | |
| 459 SDL_PixelFormat *srcfmt = info->src; | |
| 460 SDL_PixelFormat *dstfmt = info->dst; | |
| 461 const SDL_Color *srcpal = info->src->palette->colors; | |
| 462 Uint32 ckey = srcfmt->colorkey; | |
| 463 int dstbpp; | |
| 464 const int A = srcfmt->alpha; | |
| 465 | |
| 466 /* Set up some basic variables */ | |
| 467 dstbpp = dstfmt->BytesPerPixel; | |
| 468 | |
| 469 while ( height-- ) { | |
| 470 int sR, sG, sB; | |
| 471 int dR, dG, dB; | |
| 472 DUFFS_LOOP( | |
| 473 { | |
| 474 if ( *src != ckey ) { | |
| 475 Uint32 pixel; | |
| 476 sR = srcpal[*src].r; | |
| 477 sG = srcpal[*src].g; | |
| 478 sB = srcpal[*src].b; | |
| 479 DISEMBLE_RGB(dst, dstbpp, dstfmt, | |
| 480 pixel, dR, dG, dB); | |
| 481 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); | |
| 482 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB); | |
| 483 } | |
| 484 src++; | |
| 485 dst += dstbpp; | |
| 486 }, | |
| 487 width); | |
| 488 src += srcskip; | |
| 489 dst += dstskip; | |
| 490 } | |
| 491 } | |
| 492 | |
| 493 static SDL_loblit one_blit[] = { | |
| 494 NULL, Blit1to1, Blit1to2, Blit1to3, Blit1to4 | |
| 495 }; | |
| 496 | |
| 497 static SDL_loblit one_blitkey[] = { | |
| 498 NULL, Blit1to1Key, Blit1to2Key, Blit1to3Key, Blit1to4Key | |
| 499 }; | |
| 500 | |
| 501 SDL_loblit SDL_CalculateBlit1(SDL_Surface *surface, int blit_index) | |
| 502 { | |
| 503 int which; | |
| 504 SDL_PixelFormat *dstfmt; | |
| 505 | |
| 506 dstfmt = surface->map->dst->format; | |
| 507 if ( dstfmt->BitsPerPixel < 8 ) { | |
| 508 which = 0; | |
| 509 } else { | |
| 510 which = dstfmt->BytesPerPixel; | |
| 511 } | |
| 512 switch(blit_index) { | |
| 513 case 0: /* copy */ | |
| 514 return one_blit[which]; | |
| 515 | |
| 516 case 1: /* colorkey */ | |
| 517 return one_blitkey[which]; | |
| 518 | |
| 519 case 2: /* alpha */ | |
| 520 /* Supporting 8bpp->8bpp alpha is doable but requires lots of | |
| 521 tables which consume space and takes time to precompute, | |
| 522 so is better left to the user */ | |
| 523 return which >= 2 ? Blit1toNAlpha : NULL; | |
| 524 | |
| 525 case 3: /* alpha + colorkey */ | |
| 526 return which >= 2 ? Blit1toNAlphaKey : NULL; | |
| 527 | |
| 528 } | |
| 529 return NULL; | |
| 530 } |