e14743d1 |
1 | /* |
2 | SDL - Simple DirectMedia Layer |
3 | Copyright (C) 1997-2009 Sam Lantinga |
4 | |
5 | This library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 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 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with this library; if not, write to the Free Software |
17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
18 | |
19 | Sam Lantinga |
20 | slouken@libsdl.org |
21 | */ |
22 | #include "SDL_config.h" |
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 */ |
133 | switch (width & 3) { |
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 */ |
165 | switch (width & 3) { |
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 | } |
262 | switch ( width & 3 ) { |
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 | } |