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 | |
27 | /* Functions to blit from bitmaps to other surfaces */ |
28 | |
29 | static void BlitBto1(SDL_BlitInfo *info) |
30 | { |
31 | int c; |
32 | int width, height; |
33 | Uint8 *src, *map, *dst; |
34 | int srcskip, dstskip; |
35 | |
36 | /* Set up some basic variables */ |
37 | width = info->d_width; |
38 | height = info->d_height; |
39 | src = info->s_pixels; |
40 | srcskip = info->s_skip; |
41 | dst = info->d_pixels; |
42 | dstskip = info->d_skip; |
43 | map = info->table; |
44 | srcskip += width-(width+7)/8; |
45 | |
46 | if ( map ) { |
47 | while ( height-- ) { |
48 | Uint8 byte = 0, bit; |
49 | for ( c=0; c<width; ++c ) { |
50 | if ( (c&7) == 0 ) { |
51 | byte = *src++; |
52 | } |
53 | bit = (byte&0x80)>>7; |
54 | if ( 1 ) { |
55 | *dst = map[bit]; |
56 | } |
57 | dst++; |
58 | byte <<= 1; |
59 | } |
60 | src += srcskip; |
61 | dst += dstskip; |
62 | } |
63 | } else { |
64 | while ( height-- ) { |
65 | Uint8 byte = 0, bit; |
66 | for ( c=0; c<width; ++c ) { |
67 | if ( (c&7) == 0 ) { |
68 | byte = *src++; |
69 | } |
70 | bit = (byte&0x80)>>7; |
71 | if ( 1 ) { |
72 | *dst = bit; |
73 | } |
74 | dst++; |
75 | byte <<= 1; |
76 | } |
77 | src += srcskip; |
78 | dst += dstskip; |
79 | } |
80 | } |
81 | } |
82 | static void BlitBto2(SDL_BlitInfo *info) |
83 | { |
84 | int c; |
85 | int width, height; |
86 | Uint8 *src; |
87 | Uint16 *map, *dst; |
88 | int srcskip, dstskip; |
89 | |
90 | /* Set up some basic variables */ |
91 | width = info->d_width; |
92 | height = info->d_height; |
93 | src = info->s_pixels; |
94 | srcskip = info->s_skip; |
95 | dst = (Uint16 *)info->d_pixels; |
96 | dstskip = info->d_skip/2; |
97 | map = (Uint16 *)info->table; |
98 | srcskip += width-(width+7)/8; |
99 | |
100 | while ( height-- ) { |
101 | Uint8 byte = 0, bit; |
102 | for ( c=0; c<width; ++c ) { |
103 | if ( (c&7) == 0 ) { |
104 | byte = *src++; |
105 | } |
106 | bit = (byte&0x80)>>7; |
107 | if ( 1 ) { |
108 | *dst = map[bit]; |
109 | } |
110 | byte <<= 1; |
111 | dst++; |
112 | } |
113 | src += srcskip; |
114 | dst += dstskip; |
115 | } |
116 | } |
117 | static void BlitBto3(SDL_BlitInfo *info) |
118 | { |
119 | int c, o; |
120 | int width, height; |
121 | Uint8 *src, *map, *dst; |
122 | int srcskip, dstskip; |
123 | |
124 | /* Set up some basic variables */ |
125 | width = info->d_width; |
126 | height = info->d_height; |
127 | src = info->s_pixels; |
128 | srcskip = info->s_skip; |
129 | dst = info->d_pixels; |
130 | dstskip = info->d_skip; |
131 | map = info->table; |
132 | srcskip += width-(width+7)/8; |
133 | |
134 | while ( height-- ) { |
135 | Uint8 byte = 0, bit; |
136 | for ( c=0; c<width; ++c ) { |
137 | if ( (c&7) == 0 ) { |
138 | byte = *src++; |
139 | } |
140 | bit = (byte&0x80)>>7; |
141 | if ( 1 ) { |
142 | o = bit * 4; |
143 | dst[0] = map[o++]; |
144 | dst[1] = map[o++]; |
145 | dst[2] = map[o++]; |
146 | } |
147 | byte <<= 1; |
148 | dst += 3; |
149 | } |
150 | src += srcskip; |
151 | dst += dstskip; |
152 | } |
153 | } |
154 | static void BlitBto4(SDL_BlitInfo *info) |
155 | { |
156 | int width, height; |
157 | Uint8 *src; |
158 | Uint32 *map, *dst; |
159 | int srcskip, dstskip; |
160 | int c; |
161 | |
162 | /* Set up some basic variables */ |
163 | width = info->d_width; |
164 | height = info->d_height; |
165 | src = info->s_pixels; |
166 | srcskip = info->s_skip; |
167 | dst = (Uint32 *)info->d_pixels; |
168 | dstskip = info->d_skip/4; |
169 | map = (Uint32 *)info->table; |
170 | srcskip += width-(width+7)/8; |
171 | |
172 | while ( height-- ) { |
173 | Uint8 byte = 0, bit; |
174 | for ( c=0; c<width; ++c ) { |
175 | if ( (c&7) == 0 ) { |
176 | byte = *src++; |
177 | } |
178 | bit = (byte&0x80)>>7; |
179 | if ( 1 ) { |
180 | *dst = map[bit]; |
181 | } |
182 | byte <<= 1; |
183 | dst++; |
184 | } |
185 | src += srcskip; |
186 | dst += dstskip; |
187 | } |
188 | } |
189 | |
190 | static void BlitBto1Key(SDL_BlitInfo *info) |
191 | { |
192 | int width = info->d_width; |
193 | int height = info->d_height; |
194 | Uint8 *src = info->s_pixels; |
195 | Uint8 *dst = info->d_pixels; |
196 | int srcskip = info->s_skip; |
197 | int dstskip = info->d_skip; |
198 | Uint32 ckey = info->src->colorkey; |
199 | Uint8 *palmap = info->table; |
200 | int c; |
201 | |
202 | /* Set up some basic variables */ |
203 | srcskip += width-(width+7)/8; |
204 | |
205 | if ( palmap ) { |
206 | while ( height-- ) { |
207 | Uint8 byte = 0, bit; |
208 | for ( c=0; c<width; ++c ) { |
209 | if ( (c&7) == 0 ) { |
210 | byte = *src++; |
211 | } |
212 | bit = (byte&0x80)>>7; |
213 | if ( bit != ckey ) { |
214 | *dst = palmap[bit]; |
215 | } |
216 | dst++; |
217 | byte <<= 1; |
218 | } |
219 | src += srcskip; |
220 | dst += dstskip; |
221 | } |
222 | } else { |
223 | while ( height-- ) { |
224 | Uint8 byte = 0, bit; |
225 | for ( c=0; c<width; ++c ) { |
226 | if ( (c&7) == 0 ) { |
227 | byte = *src++; |
228 | } |
229 | bit = (byte&0x80)>>7; |
230 | if ( bit != ckey ) { |
231 | *dst = bit; |
232 | } |
233 | dst++; |
234 | byte <<= 1; |
235 | } |
236 | src += srcskip; |
237 | dst += dstskip; |
238 | } |
239 | } |
240 | } |
241 | |
242 | static void BlitBto2Key(SDL_BlitInfo *info) |
243 | { |
244 | int width = info->d_width; |
245 | int height = info->d_height; |
246 | Uint8 *src = info->s_pixels; |
247 | Uint16 *dstp = (Uint16 *)info->d_pixels; |
248 | int srcskip = info->s_skip; |
249 | int dstskip = info->d_skip; |
250 | Uint32 ckey = info->src->colorkey; |
251 | Uint8 *palmap = info->table; |
252 | int c; |
253 | |
254 | /* Set up some basic variables */ |
255 | srcskip += width-(width+7)/8; |
256 | dstskip /= 2; |
257 | |
258 | while ( height-- ) { |
259 | Uint8 byte = 0, bit; |
260 | for ( c=0; c<width; ++c ) { |
261 | if ( (c&7) == 0 ) { |
262 | byte = *src++; |
263 | } |
264 | bit = (byte&0x80)>>7; |
265 | if ( bit != ckey ) { |
266 | *dstp=((Uint16 *)palmap)[bit]; |
267 | } |
268 | byte <<= 1; |
269 | dstp++; |
270 | } |
271 | src += srcskip; |
272 | dstp += dstskip; |
273 | } |
274 | } |
275 | |
276 | static void BlitBto3Key(SDL_BlitInfo *info) |
277 | { |
278 | int width = info->d_width; |
279 | int height = info->d_height; |
280 | Uint8 *src = info->s_pixels; |
281 | Uint8 *dst = info->d_pixels; |
282 | int srcskip = info->s_skip; |
283 | int dstskip = info->d_skip; |
284 | Uint32 ckey = info->src->colorkey; |
285 | Uint8 *palmap = info->table; |
286 | int c; |
287 | |
288 | /* Set up some basic variables */ |
289 | srcskip += width-(width+7)/8; |
290 | |
291 | while ( height-- ) { |
292 | Uint8 byte = 0, bit; |
293 | for ( c=0; c<width; ++c ) { |
294 | if ( (c&7) == 0 ) { |
295 | byte = *src++; |
296 | } |
297 | bit = (byte&0x80)>>7; |
298 | if ( bit != ckey ) { |
299 | SDL_memcpy(dst, &palmap[bit*4], 3); |
300 | } |
301 | byte <<= 1; |
302 | dst += 3; |
303 | } |
304 | src += srcskip; |
305 | dst += dstskip; |
306 | } |
307 | } |
308 | |
309 | static void BlitBto4Key(SDL_BlitInfo *info) |
310 | { |
311 | int width = info->d_width; |
312 | int height = info->d_height; |
313 | Uint8 *src = info->s_pixels; |
314 | Uint32 *dstp = (Uint32 *)info->d_pixels; |
315 | int srcskip = info->s_skip; |
316 | int dstskip = info->d_skip; |
317 | Uint32 ckey = info->src->colorkey; |
318 | Uint8 *palmap = info->table; |
319 | int c; |
320 | |
321 | /* Set up some basic variables */ |
322 | srcskip += width-(width+7)/8; |
323 | dstskip /= 4; |
324 | |
325 | while ( height-- ) { |
326 | Uint8 byte = 0, bit; |
327 | for ( c=0; c<width; ++c ) { |
328 | if ( (c&7) == 0 ) { |
329 | byte = *src++; |
330 | } |
331 | bit = (byte&0x80)>>7; |
332 | if ( bit != ckey ) { |
333 | *dstp=((Uint32 *)palmap)[bit]; |
334 | } |
335 | byte <<= 1; |
336 | dstp++; |
337 | } |
338 | src += srcskip; |
339 | dstp += dstskip; |
340 | } |
341 | } |
342 | |
343 | static void BlitBtoNAlpha(SDL_BlitInfo *info) |
344 | { |
345 | int width = info->d_width; |
346 | int height = info->d_height; |
347 | Uint8 *src = info->s_pixels; |
348 | Uint8 *dst = info->d_pixels; |
349 | int srcskip = info->s_skip; |
350 | int dstskip = info->d_skip; |
351 | const SDL_Color *srcpal = info->src->palette->colors; |
352 | SDL_PixelFormat *dstfmt = info->dst; |
353 | int dstbpp; |
354 | int c; |
355 | const int A = info->src->alpha; |
356 | |
357 | /* Set up some basic variables */ |
358 | dstbpp = dstfmt->BytesPerPixel; |
359 | srcskip += width-(width+7)/8; |
360 | |
361 | while ( height-- ) { |
362 | Uint8 byte = 0, bit; |
363 | for ( c=0; c<width; ++c ) { |
364 | if ( (c&7) == 0 ) { |
365 | byte = *src++; |
366 | } |
367 | bit = (byte&0x80)>>7; |
368 | if ( 1 ) { |
369 | Uint32 pixel; |
370 | unsigned sR, sG, sB; |
371 | unsigned dR, dG, dB; |
372 | sR = srcpal[bit].r; |
373 | sG = srcpal[bit].g; |
374 | sB = srcpal[bit].b; |
375 | DISEMBLE_RGB(dst, dstbpp, dstfmt, |
376 | pixel, dR, dG, dB); |
377 | ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); |
378 | ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB); |
379 | } |
380 | byte <<= 1; |
381 | dst += dstbpp; |
382 | } |
383 | src += srcskip; |
384 | dst += dstskip; |
385 | } |
386 | } |
387 | |
388 | static void BlitBtoNAlphaKey(SDL_BlitInfo *info) |
389 | { |
390 | int width = info->d_width; |
391 | int height = info->d_height; |
392 | Uint8 *src = info->s_pixels; |
393 | Uint8 *dst = info->d_pixels; |
394 | int srcskip = info->s_skip; |
395 | int dstskip = info->d_skip; |
396 | SDL_PixelFormat *srcfmt = info->src; |
397 | SDL_PixelFormat *dstfmt = info->dst; |
398 | const SDL_Color *srcpal = srcfmt->palette->colors; |
399 | int dstbpp; |
400 | int c; |
401 | const int A = srcfmt->alpha; |
402 | Uint32 ckey = srcfmt->colorkey; |
403 | |
404 | /* Set up some basic variables */ |
405 | dstbpp = dstfmt->BytesPerPixel; |
406 | srcskip += width-(width+7)/8; |
407 | |
408 | while ( height-- ) { |
409 | Uint8 byte = 0, bit; |
410 | for ( c=0; c<width; ++c ) { |
411 | if ( (c&7) == 0 ) { |
412 | byte = *src++; |
413 | } |
414 | bit = (byte&0x80)>>7; |
415 | if ( bit != ckey ) { |
416 | int sR, sG, sB; |
417 | int dR, dG, dB; |
418 | Uint32 pixel; |
419 | sR = srcpal[bit].r; |
420 | sG = srcpal[bit].g; |
421 | sB = srcpal[bit].b; |
422 | DISEMBLE_RGB(dst, dstbpp, dstfmt, |
423 | pixel, dR, dG, dB); |
424 | ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); |
425 | ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB); |
426 | } |
427 | byte <<= 1; |
428 | dst += dstbpp; |
429 | } |
430 | src += srcskip; |
431 | dst += dstskip; |
432 | } |
433 | } |
434 | |
435 | static SDL_loblit bitmap_blit[] = { |
436 | NULL, BlitBto1, BlitBto2, BlitBto3, BlitBto4 |
437 | }; |
438 | |
439 | static SDL_loblit colorkey_blit[] = { |
440 | NULL, BlitBto1Key, BlitBto2Key, BlitBto3Key, BlitBto4Key |
441 | }; |
442 | |
443 | SDL_loblit SDL_CalculateBlit0(SDL_Surface *surface, int blit_index) |
444 | { |
445 | int which; |
446 | |
447 | if ( surface->format->BitsPerPixel != 1 ) { |
448 | /* We don't support sub 8-bit packed pixel modes */ |
449 | return NULL; |
450 | } |
451 | if ( surface->map->dst->format->BitsPerPixel < 8 ) { |
452 | which = 0; |
453 | } else { |
454 | which = surface->map->dst->format->BytesPerPixel; |
455 | } |
456 | switch(blit_index) { |
457 | case 0: /* copy */ |
458 | return bitmap_blit[which]; |
459 | |
460 | case 1: /* colorkey */ |
461 | return colorkey_blit[which]; |
462 | |
463 | case 2: /* alpha */ |
464 | return which >= 2 ? BlitBtoNAlpha : NULL; |
465 | |
466 | case 4: /* alpha + colorkey */ |
467 | return which >= 2 ? BlitBtoNAlphaKey : NULL; |
468 | } |
469 | return NULL; |
470 | } |
471 | |