Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit_1.c @ 1385:85d8b5fdd9f6
Fixed defaults for 8 bpp visuals
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 20 Feb 2006 10:18:08 +0000 |
| parents | c71e05b4dc2e |
| children | d910939febfa |
| 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 | |
|
252
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Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
parents:
91
diff
changeset
|
20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #include "SDL_video.h" | |
| 24 #include "SDL_blit.h" | |
| 25 #include "SDL_sysvideo.h" | |
| 26 #include "SDL_endian.h" | |
| 27 | |
| 28 /* Functions to blit from 8-bit surfaces to other surfaces */ | |
| 29 | |
| 30 static void Blit1to1(SDL_BlitInfo *info) | |
| 31 { | |
| 32 #ifndef USE_DUFFS_LOOP | |
| 33 int c; | |
| 34 #endif | |
| 35 int width, height; | |
| 36 Uint8 *src, *map, *dst; | |
| 37 int srcskip, dstskip; | |
| 38 | |
| 39 /* Set up some basic variables */ | |
| 40 width = info->d_width; | |
| 41 height = info->d_height; | |
| 42 src = info->s_pixels; | |
| 43 srcskip = info->s_skip; | |
| 44 dst = info->d_pixels; | |
| 45 dstskip = info->d_skip; | |
| 46 map = info->table; | |
| 47 | |
| 48 while ( height-- ) { | |
| 49 #ifdef USE_DUFFS_LOOP | |
| 50 DUFFS_LOOP( | |
| 51 { | |
| 52 *dst = map[*src]; | |
| 53 } | |
| 54 dst++; | |
| 55 src++; | |
| 56 , width); | |
| 57 #else | |
| 58 for ( c=width; c; --c ) { | |
| 59 *dst = map[*src]; | |
| 60 dst++; | |
| 61 src++; | |
| 62 } | |
| 63 #endif | |
| 64 src += srcskip; | |
| 65 dst += dstskip; | |
| 66 } | |
| 67 } | |
| 68 /* This is now endian dependent */ | |
| 69 #if ( SDL_BYTEORDER == SDL_LIL_ENDIAN ) | |
| 70 #define HI 1 | |
| 71 #define LO 0 | |
| 72 #else /* ( SDL_BYTEORDER == SDL_BIG_ENDIAN ) */ | |
| 73 #define HI 0 | |
| 74 #define LO 1 | |
| 75 #endif | |
| 76 static void Blit1to2(SDL_BlitInfo *info) | |
| 77 { | |
| 78 #ifndef USE_DUFFS_LOOP | |
| 79 int c; | |
| 80 #endif | |
| 81 int width, height; | |
| 82 Uint8 *src, *dst; | |
| 83 Uint16 *map; | |
| 84 int srcskip, dstskip; | |
| 85 | |
| 86 /* Set up some basic variables */ | |
| 87 width = info->d_width; | |
| 88 height = info->d_height; | |
| 89 src = info->s_pixels; | |
| 90 srcskip = info->s_skip; | |
| 91 dst = info->d_pixels; | |
| 92 dstskip = info->d_skip; | |
| 93 map = (Uint16 *)info->table; | |
| 94 | |
| 95 #ifdef USE_DUFFS_LOOP | |
| 96 while ( height-- ) { | |
| 97 DUFFS_LOOP( | |
| 98 { | |
| 99 *(Uint16 *)dst = map[*src++]; | |
| 100 dst += 2; | |
| 101 }, | |
| 102 width); | |
| 103 src += srcskip; | |
| 104 dst += dstskip; | |
| 105 } | |
| 106 #else | |
| 107 /* Memory align at 4-byte boundary, if necessary */ | |
| 108 if ( (long)dst & 0x03 ) { | |
| 109 /* Don't do anything if width is 0 */ | |
| 110 if ( width == 0 ) { | |
| 111 return; | |
| 112 } | |
| 113 --width; | |
| 114 | |
| 115 while ( height-- ) { | |
| 116 /* Perform copy alignment */ | |
| 117 *(Uint16 *)dst = map[*src++]; | |
| 118 dst += 2; | |
| 119 | |
| 120 /* Copy in 4 pixel chunks */ | |
| 121 for ( c=width/4; c; --c ) { | |
| 122 *(Uint32 *)dst = | |
| 123 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 124 src += 2; | |
| 125 dst += 4; | |
| 126 *(Uint32 *)dst = | |
| 127 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 128 src += 2; | |
| 129 dst += 4; | |
| 130 } | |
| 131 /* Get any leftovers */ | |
|
91
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From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
132 switch (width & 3) { |
| 0 | 133 case 3: |
| 134 *(Uint16 *)dst = map[*src++]; | |
| 135 dst += 2; | |
| 136 case 2: | |
| 137 *(Uint32 *)dst = | |
| 138 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 139 src += 2; | |
| 140 dst += 4; | |
| 141 break; | |
| 142 case 1: | |
| 143 *(Uint16 *)dst = map[*src++]; | |
| 144 dst += 2; | |
| 145 break; | |
| 146 } | |
| 147 src += srcskip; | |
| 148 dst += dstskip; | |
| 149 } | |
| 150 } else { | |
| 151 while ( height-- ) { | |
| 152 /* Copy in 4 pixel chunks */ | |
| 153 for ( c=width/4; c; --c ) { | |
| 154 *(Uint32 *)dst = | |
| 155 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 156 src += 2; | |
| 157 dst += 4; | |
| 158 *(Uint32 *)dst = | |
| 159 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 160 src += 2; | |
| 161 dst += 4; | |
| 162 } | |
| 163 /* Get any leftovers */ | |
|
91
e85e03f195b4
From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
164 switch (width & 3) { |
| 0 | 165 case 3: |
| 166 *(Uint16 *)dst = map[*src++]; | |
| 167 dst += 2; | |
| 168 case 2: | |
| 169 *(Uint32 *)dst = | |
| 170 (map[src[HI]]<<16)|(map[src[LO]]); | |
| 171 src += 2; | |
| 172 dst += 4; | |
| 173 break; | |
| 174 case 1: | |
| 175 *(Uint16 *)dst = map[*src++]; | |
| 176 dst += 2; | |
| 177 break; | |
| 178 } | |
| 179 src += srcskip; | |
| 180 dst += dstskip; | |
| 181 } | |
| 182 } | |
| 183 #endif /* USE_DUFFS_LOOP */ | |
| 184 } | |
| 185 static void Blit1to3(SDL_BlitInfo *info) | |
| 186 { | |
| 187 #ifndef USE_DUFFS_LOOP | |
| 188 int c; | |
| 189 #endif | |
| 190 int o; | |
| 191 int width, height; | |
| 192 Uint8 *src, *map, *dst; | |
| 193 int srcskip, dstskip; | |
| 194 | |
| 195 /* Set up some basic variables */ | |
| 196 width = info->d_width; | |
| 197 height = info->d_height; | |
| 198 src = info->s_pixels; | |
| 199 srcskip = info->s_skip; | |
| 200 dst = info->d_pixels; | |
| 201 dstskip = info->d_skip; | |
| 202 map = info->table; | |
| 203 | |
| 204 while ( height-- ) { | |
| 205 #ifdef USE_DUFFS_LOOP | |
| 206 DUFFS_LOOP( | |
| 207 { | |
| 208 o = *src * 4; | |
| 209 dst[0] = map[o++]; | |
| 210 dst[1] = map[o++]; | |
| 211 dst[2] = map[o++]; | |
| 212 } | |
| 213 src++; | |
| 214 dst += 3; | |
| 215 , width); | |
| 216 #else | |
| 217 for ( c=width; c; --c ) { | |
| 218 o = *src * 4; | |
| 219 dst[0] = map[o++]; | |
| 220 dst[1] = map[o++]; | |
| 221 dst[2] = map[o++]; | |
| 222 src++; | |
| 223 dst += 3; | |
| 224 } | |
| 225 #endif /* USE_DUFFS_LOOP */ | |
| 226 src += srcskip; | |
| 227 dst += dstskip; | |
| 228 } | |
| 229 } | |
| 230 static void Blit1to4(SDL_BlitInfo *info) | |
| 231 { | |
| 232 #ifndef USE_DUFFS_LOOP | |
| 233 int c; | |
| 234 #endif | |
| 235 int width, height; | |
| 236 Uint8 *src; | |
| 237 Uint32 *map, *dst; | |
| 238 int srcskip, dstskip; | |
| 239 | |
| 240 /* Set up some basic variables */ | |
| 241 width = info->d_width; | |
| 242 height = info->d_height; | |
| 243 src = info->s_pixels; | |
| 244 srcskip = info->s_skip; | |
| 245 dst = (Uint32 *)info->d_pixels; | |
| 246 dstskip = info->d_skip/4; | |
| 247 map = (Uint32 *)info->table; | |
| 248 | |
| 249 while ( height-- ) { | |
| 250 #ifdef USE_DUFFS_LOOP | |
| 251 DUFFS_LOOP( | |
| 252 *dst++ = map[*src++]; | |
| 253 , width); | |
| 254 #else | |
| 255 for ( c=width/4; c; --c ) { | |
| 256 *dst++ = map[*src++]; | |
| 257 *dst++ = map[*src++]; | |
| 258 *dst++ = map[*src++]; | |
| 259 *dst++ = map[*src++]; | |
| 260 } | |
|
91
e85e03f195b4
From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
261 switch ( width & 3 ) { |
| 0 | 262 case 3: |
| 263 *dst++ = map[*src++]; | |
| 264 case 2: | |
| 265 *dst++ = map[*src++]; | |
| 266 case 1: | |
| 267 *dst++ = map[*src++]; | |
| 268 } | |
| 269 #endif /* USE_DUFFS_LOOP */ | |
| 270 src += srcskip; | |
| 271 dst += dstskip; | |
| 272 } | |
| 273 } | |
| 274 | |
| 275 static void Blit1to1Key(SDL_BlitInfo *info) | |
| 276 { | |
| 277 int width = info->d_width; | |
| 278 int height = info->d_height; | |
| 279 Uint8 *src = info->s_pixels; | |
| 280 int srcskip = info->s_skip; | |
| 281 Uint8 *dst = info->d_pixels; | |
| 282 int dstskip = info->d_skip; | |
| 283 Uint8 *palmap = info->table; | |
| 284 Uint32 ckey = info->src->colorkey; | |
| 285 | |
| 286 if ( palmap ) { | |
| 287 while ( height-- ) { | |
| 288 DUFFS_LOOP( | |
| 289 { | |
| 290 if ( *src != ckey ) { | |
| 291 *dst = palmap[*src]; | |
| 292 } | |
| 293 dst++; | |
| 294 src++; | |
| 295 }, | |
| 296 width); | |
| 297 src += srcskip; | |
| 298 dst += dstskip; | |
| 299 } | |
| 300 } else { | |
| 301 while ( height-- ) { | |
| 302 DUFFS_LOOP( | |
| 303 { | |
| 304 if ( *src != ckey ) { | |
| 305 *dst = *src; | |
| 306 } | |
| 307 dst++; | |
| 308 src++; | |
| 309 }, | |
| 310 width); | |
| 311 src += srcskip; | |
| 312 dst += dstskip; | |
| 313 } | |
| 314 } | |
| 315 } | |
| 316 | |
| 317 static void Blit1to2Key(SDL_BlitInfo *info) | |
| 318 { | |
| 319 int width = info->d_width; | |
| 320 int height = info->d_height; | |
| 321 Uint8 *src = info->s_pixels; | |
| 322 int srcskip = info->s_skip; | |
| 323 Uint16 *dstp = (Uint16 *)info->d_pixels; | |
| 324 int dstskip = info->d_skip; | |
| 325 Uint16 *palmap = (Uint16 *)info->table; | |
| 326 Uint32 ckey = info->src->colorkey; | |
| 327 | |
| 328 /* Set up some basic variables */ | |
| 329 dstskip /= 2; | |
| 330 | |
| 331 while ( height-- ) { | |
| 332 DUFFS_LOOP( | |
| 333 { | |
| 334 if ( *src != ckey ) { | |
| 335 *dstp=palmap[*src]; | |
| 336 } | |
| 337 src++; | |
| 338 dstp++; | |
| 339 }, | |
| 340 width); | |
| 341 src += srcskip; | |
| 342 dstp += dstskip; | |
| 343 } | |
| 344 } | |
| 345 | |
| 346 static void Blit1to3Key(SDL_BlitInfo *info) | |
| 347 { | |
| 348 int width = info->d_width; | |
| 349 int height = info->d_height; | |
| 350 Uint8 *src = info->s_pixels; | |
| 351 int srcskip = info->s_skip; | |
| 352 Uint8 *dst = info->d_pixels; | |
| 353 int dstskip = info->d_skip; | |
| 354 Uint8 *palmap = info->table; | |
| 355 Uint32 ckey = info->src->colorkey; | |
| 356 int o; | |
| 357 | |
| 358 while ( height-- ) { | |
| 359 DUFFS_LOOP( | |
| 360 { | |
| 361 if ( *src != ckey ) { | |
| 362 o = *src * 4; | |
| 363 dst[0] = palmap[o++]; | |
| 364 dst[1] = palmap[o++]; | |
| 365 dst[2] = palmap[o++]; | |
| 366 } | |
| 367 src++; | |
| 368 dst += 3; | |
| 369 }, | |
| 370 width); | |
| 371 src += srcskip; | |
| 372 dst += dstskip; | |
| 373 } | |
| 374 } | |
| 375 | |
| 376 static void Blit1to4Key(SDL_BlitInfo *info) | |
| 377 { | |
| 378 int width = info->d_width; | |
| 379 int height = info->d_height; | |
| 380 Uint8 *src = info->s_pixels; | |
| 381 int srcskip = info->s_skip; | |
| 382 Uint32 *dstp = (Uint32 *)info->d_pixels; | |
| 383 int dstskip = info->d_skip; | |
| 384 Uint32 *palmap = (Uint32 *)info->table; | |
| 385 Uint32 ckey = info->src->colorkey; | |
| 386 | |
| 387 /* Set up some basic variables */ | |
| 388 dstskip /= 4; | |
| 389 | |
| 390 while ( height-- ) { | |
| 391 DUFFS_LOOP( | |
| 392 { | |
| 393 if ( *src != ckey ) { | |
| 394 *dstp = palmap[*src]; | |
| 395 } | |
| 396 src++; | |
| 397 dstp++; | |
| 398 }, | |
| 399 width); | |
| 400 src += srcskip; | |
| 401 dstp += dstskip; | |
| 402 } | |
| 403 } | |
| 404 | |
| 405 static void Blit1toNAlpha(SDL_BlitInfo *info) | |
| 406 { | |
| 407 int width = info->d_width; | |
| 408 int height = info->d_height; | |
| 409 Uint8 *src = info->s_pixels; | |
| 410 int srcskip = info->s_skip; | |
| 411 Uint8 *dst = info->d_pixels; | |
| 412 int dstskip = info->d_skip; | |
| 413 SDL_PixelFormat *dstfmt = info->dst; | |
| 414 const SDL_Color *srcpal = info->src->palette->colors; | |
| 415 int dstbpp; | |
| 416 const int A = info->src->alpha; | |
| 417 | |
| 418 /* Set up some basic variables */ | |
| 419 dstbpp = dstfmt->BytesPerPixel; | |
| 420 | |
| 421 while ( height-- ) { | |
| 422 int sR, sG, sB; | |
| 423 int dR, dG, dB; | |
| 424 DUFFS_LOOP4( | |
| 425 { | |
| 426 Uint32 pixel; | |
| 427 sR = srcpal[*src].r; | |
| 428 sG = srcpal[*src].g; | |
| 429 sB = srcpal[*src].b; | |
| 430 DISEMBLE_RGB(dst, dstbpp, dstfmt, | |
| 431 pixel, dR, dG, dB); | |
| 432 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); | |
| 433 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB); | |
| 434 src++; | |
| 435 dst += dstbpp; | |
| 436 }, | |
| 437 width); | |
| 438 src += srcskip; | |
| 439 dst += dstskip; | |
| 440 } | |
| 441 } | |
| 442 | |
| 443 static void Blit1toNAlphaKey(SDL_BlitInfo *info) | |
| 444 { | |
| 445 int width = info->d_width; | |
| 446 int height = info->d_height; | |
| 447 Uint8 *src = info->s_pixels; | |
| 448 int srcskip = info->s_skip; | |
| 449 Uint8 *dst = info->d_pixels; | |
| 450 int dstskip = info->d_skip; | |
| 451 SDL_PixelFormat *srcfmt = info->src; | |
| 452 SDL_PixelFormat *dstfmt = info->dst; | |
| 453 const SDL_Color *srcpal = info->src->palette->colors; | |
| 454 Uint32 ckey = srcfmt->colorkey; | |
| 455 int dstbpp; | |
| 456 const int A = srcfmt->alpha; | |
| 457 | |
| 458 /* Set up some basic variables */ | |
| 459 dstbpp = dstfmt->BytesPerPixel; | |
| 460 | |
| 461 while ( height-- ) { | |
| 462 int sR, sG, sB; | |
| 463 int dR, dG, dB; | |
| 464 DUFFS_LOOP( | |
| 465 { | |
| 466 if ( *src != ckey ) { | |
| 467 Uint32 pixel; | |
| 468 sR = srcpal[*src].r; | |
| 469 sG = srcpal[*src].g; | |
| 470 sB = srcpal[*src].b; | |
| 471 DISEMBLE_RGB(dst, dstbpp, dstfmt, | |
| 472 pixel, dR, dG, dB); | |
| 473 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); | |
| 474 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB); | |
| 475 } | |
| 476 src++; | |
| 477 dst += dstbpp; | |
| 478 }, | |
| 479 width); | |
| 480 src += srcskip; | |
| 481 dst += dstskip; | |
| 482 } | |
| 483 } | |
| 484 | |
| 485 static SDL_loblit one_blit[] = { | |
| 486 NULL, Blit1to1, Blit1to2, Blit1to3, Blit1to4 | |
| 487 }; | |
| 488 | |
| 489 static SDL_loblit one_blitkey[] = { | |
| 490 NULL, Blit1to1Key, Blit1to2Key, Blit1to3Key, Blit1to4Key | |
| 491 }; | |
| 492 | |
| 493 SDL_loblit SDL_CalculateBlit1(SDL_Surface *surface, int blit_index) | |
| 494 { | |
| 495 int which; | |
| 496 SDL_PixelFormat *dstfmt; | |
| 497 | |
| 498 dstfmt = surface->map->dst->format; | |
| 499 if ( dstfmt->BitsPerPixel < 8 ) { | |
| 500 which = 0; | |
| 501 } else { | |
| 502 which = dstfmt->BytesPerPixel; | |
| 503 } | |
| 504 switch(blit_index) { | |
| 505 case 0: /* copy */ | |
| 506 return one_blit[which]; | |
| 507 | |
| 508 case 1: /* colorkey */ | |
| 509 return one_blitkey[which]; | |
| 510 | |
| 511 case 2: /* alpha */ | |
| 512 /* Supporting 8bpp->8bpp alpha is doable but requires lots of | |
| 513 tables which consume space and takes time to precompute, | |
| 514 so is better left to the user */ | |
| 515 return which >= 2 ? Blit1toNAlpha : NULL; | |
| 516 | |
| 517 case 3: /* alpha + colorkey */ | |
| 518 return which >= 2 ? Blit1toNAlphaKey : NULL; | |
| 519 | |
| 520 } | |
| 521 return NULL; | |
| 522 } |