Mercurial > sdl-ios-xcode
annotate src/video/SDL_pixels.c @ 358:1f148809d972
Wilbern Cobb fixed joystick code on FreeBSD
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Tue, 16 Apr 2002 16:45:23 +0000 |
parents | f6ffac90895c |
children | e561e8752d33 |
rev | line source |
---|---|
0 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
297
f6ffac90895c
Updated copyright information for 2002
Sam Lantinga <slouken@libsdl.org>
parents:
252
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changeset
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga |
0 | 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 | |
252
e8157fcb3114
Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
parents:
50
diff
changeset
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20 slouken@libsdl.org |
0 | 21 */ |
22 | |
23 #ifdef SAVE_RCSID | |
24 static char rcsid = | |
25 "@(#) $Id$"; | |
26 #endif | |
27 | |
28 /* General (mostly internal) pixel/color manipulation routines for SDL */ | |
29 | |
30 #include <stdio.h> | |
31 #include <stdlib.h> | |
32 #include <string.h> | |
33 | |
34 #include "SDL_error.h" | |
35 #include "SDL_endian.h" | |
36 #include "SDL_video.h" | |
37 #include "SDL_sysvideo.h" | |
38 #include "SDL_blit.h" | |
39 #include "SDL_pixels_c.h" | |
40 #include "SDL_RLEaccel_c.h" | |
41 | |
42 /* Helper functions */ | |
43 /* | |
44 * Allocate a pixel format structure and fill it according to the given info. | |
45 */ | |
46 SDL_PixelFormat *SDL_AllocFormat(int bpp, | |
47 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) | |
48 { | |
49 SDL_PixelFormat *format; | |
50 Uint32 mask; | |
51 | |
52 /* Allocate an empty pixel format structure */ | |
53 format = malloc(sizeof(*format)); | |
54 if ( format == NULL ) { | |
55 SDL_OutOfMemory(); | |
56 return(NULL); | |
57 } | |
58 memset(format, 0, sizeof(*format)); | |
59 format->alpha = SDL_ALPHA_OPAQUE; | |
60 | |
61 /* Set up the format */ | |
62 format->BitsPerPixel = bpp; | |
63 format->BytesPerPixel = (bpp+7)/8; | |
64 switch (bpp) { | |
65 case 1: | |
66 /* Create the 2 color black-white palette */ | |
67 format->palette = (SDL_Palette *)malloc( | |
68 sizeof(SDL_Palette)); | |
69 if ( format->palette == NULL ) { | |
70 SDL_FreeFormat(format); | |
71 SDL_OutOfMemory(); | |
72 return(NULL); | |
73 } | |
74 (format->palette)->ncolors = 2; | |
75 (format->palette)->colors = (SDL_Color *)malloc( | |
76 (format->palette)->ncolors*sizeof(SDL_Color)); | |
77 if ( (format->palette)->colors == NULL ) { | |
78 SDL_FreeFormat(format); | |
79 SDL_OutOfMemory(); | |
80 return(NULL); | |
81 } | |
82 format->palette->colors[0].r = 0xFF; | |
83 format->palette->colors[0].g = 0xFF; | |
84 format->palette->colors[0].b = 0xFF; | |
85 format->palette->colors[1].r = 0x00; | |
86 format->palette->colors[1].g = 0x00; | |
87 format->palette->colors[1].b = 0x00; | |
88 format->Rloss = 8; | |
89 format->Gloss = 8; | |
90 format->Bloss = 8; | |
91 format->Aloss = 8; | |
92 format->Rshift = 0; | |
93 format->Gshift = 0; | |
94 format->Bshift = 0; | |
95 format->Ashift = 0; | |
96 format->Rmask = 0; | |
97 format->Gmask = 0; | |
98 format->Bmask = 0; | |
99 format->Amask = 0; | |
100 break; | |
101 | |
102 case 4: | |
103 /* Create the 16 color VGA palette */ | |
104 format->palette = (SDL_Palette *)malloc( | |
105 sizeof(SDL_Palette)); | |
106 if ( format->palette == NULL ) { | |
107 SDL_FreeFormat(format); | |
108 SDL_OutOfMemory(); | |
109 return(NULL); | |
110 } | |
111 (format->palette)->ncolors = 16; | |
112 (format->palette)->colors = (SDL_Color *)malloc( | |
113 (format->palette)->ncolors*sizeof(SDL_Color)); | |
114 if ( (format->palette)->colors == NULL ) { | |
115 SDL_FreeFormat(format); | |
116 SDL_OutOfMemory(); | |
117 return(NULL); | |
118 } | |
119 /* Punt for now, will this ever be used? */ | |
120 memset((format->palette)->colors, 0, | |
121 (format->palette)->ncolors*sizeof(SDL_Color)); | |
122 | |
123 /* Palettized formats have no mask info */ | |
124 format->Rloss = 8; | |
125 format->Gloss = 8; | |
126 format->Bloss = 8; | |
127 format->Aloss = 8; | |
128 format->Rshift = 0; | |
129 format->Gshift = 0; | |
130 format->Bshift = 0; | |
131 format->Ashift = 0; | |
132 format->Rmask = 0; | |
133 format->Gmask = 0; | |
134 format->Bmask = 0; | |
135 format->Amask = 0; | |
136 break; | |
137 | |
138 case 8: | |
139 /* Create an empty 256 color palette */ | |
140 format->palette = (SDL_Palette *)malloc( | |
141 sizeof(SDL_Palette)); | |
142 if ( format->palette == NULL ) { | |
143 SDL_FreeFormat(format); | |
144 SDL_OutOfMemory(); | |
145 return(NULL); | |
146 } | |
147 (format->palette)->ncolors = 256; | |
148 (format->palette)->colors = (SDL_Color *)malloc( | |
149 (format->palette)->ncolors*sizeof(SDL_Color)); | |
150 if ( (format->palette)->colors == NULL ) { | |
151 SDL_FreeFormat(format); | |
152 SDL_OutOfMemory(); | |
153 return(NULL); | |
154 } | |
155 memset((format->palette)->colors, 0, | |
156 (format->palette)->ncolors*sizeof(SDL_Color)); | |
157 | |
158 /* Palettized formats have no mask info */ | |
159 format->Rloss = 8; | |
160 format->Gloss = 8; | |
161 format->Bloss = 8; | |
162 format->Aloss = 8; | |
163 format->Rshift = 0; | |
164 format->Gshift = 0; | |
165 format->Bshift = 0; | |
166 format->Ashift = 0; | |
167 format->Rmask = 0; | |
168 format->Gmask = 0; | |
169 format->Bmask = 0; | |
170 format->Amask = 0; | |
171 break; | |
172 | |
173 default: | |
174 /* No palette, just packed pixel info */ | |
175 format->palette = NULL; | |
176 format->Rshift = 0; | |
177 format->Rloss = 8; | |
178 if ( Rmask ) { | |
179 for ( mask = Rmask; !(mask&0x01); mask >>= 1 ) | |
180 ++format->Rshift; | |
181 for ( ; (mask&0x01); mask >>= 1 ) | |
182 --format->Rloss; | |
183 } | |
184 format->Gshift = 0; | |
185 format->Gloss = 8; | |
186 if ( Gmask ) { | |
187 for ( mask = Gmask; !(mask&0x01); mask >>= 1 ) | |
188 ++format->Gshift; | |
189 for ( ; (mask&0x01); mask >>= 1 ) | |
190 --format->Gloss; | |
191 } | |
192 format->Bshift = 0; | |
193 format->Bloss = 8; | |
194 if ( Bmask ) { | |
195 for ( mask = Bmask; !(mask&0x01); mask >>= 1 ) | |
196 ++format->Bshift; | |
197 for ( ; (mask&0x01); mask >>= 1 ) | |
198 --format->Bloss; | |
199 } | |
200 format->Ashift = 0; | |
201 format->Aloss = 8; | |
202 if ( Amask ) { | |
203 for ( mask = Amask; !(mask&0x01); mask >>= 1 ) | |
204 ++format->Ashift; | |
205 for ( ; (mask&0x01); mask >>= 1 ) | |
206 --format->Aloss; | |
207 } | |
208 format->Rmask = Rmask; | |
209 format->Gmask = Gmask; | |
210 format->Bmask = Bmask; | |
211 format->Amask = Amask; | |
212 break; | |
213 } | |
214 /* Calculate some standard bitmasks, if necessary | |
215 * Note: This could conflict with an alpha mask, if given. | |
216 */ | |
217 if ( (bpp > 8) && !format->Rmask && !format->Gmask && !format->Bmask ) { | |
218 /* R-G-B */ | |
219 if ( bpp > 24 ) | |
220 bpp = 24; | |
221 format->Rloss = 8-(bpp/3); | |
222 format->Gloss = 8-(bpp/3)-(bpp%3); | |
223 format->Bloss = 8-(bpp/3); | |
224 format->Rshift = ((bpp/3)+(bpp%3))+(bpp/3); | |
225 format->Gshift = (bpp/3); | |
226 format->Bshift = 0; | |
227 format->Rmask = ((0xFF>>format->Rloss)<<format->Rshift); | |
228 format->Gmask = ((0xFF>>format->Gloss)<<format->Gshift); | |
229 format->Bmask = ((0xFF>>format->Bloss)<<format->Bshift); | |
230 } | |
231 return(format); | |
232 } | |
233 SDL_PixelFormat *SDL_ReallocFormat(SDL_Surface *surface, int bpp, | |
234 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) | |
235 { | |
236 if ( surface->format ) { | |
237 SDL_FreeFormat(surface->format); | |
238 SDL_FormatChanged(surface); | |
239 } | |
240 surface->format = SDL_AllocFormat(bpp, Rmask, Gmask, Bmask, Amask); | |
241 return surface->format; | |
242 } | |
243 | |
244 /* | |
245 * Change any previous mappings from/to the new surface format | |
246 */ | |
247 void SDL_FormatChanged(SDL_Surface *surface) | |
248 { | |
249 surface->format_version++; | |
250 SDL_InvalidateMap(surface->map); | |
251 } | |
252 /* | |
253 * Free a previously allocated format structure | |
254 */ | |
255 void SDL_FreeFormat(SDL_PixelFormat *format) | |
256 { | |
257 if ( format ) { | |
258 if ( format->palette ) { | |
259 if ( format->palette->colors ) { | |
260 free(format->palette->colors); | |
261 } | |
262 free(format->palette); | |
263 } | |
264 free(format); | |
265 } | |
266 } | |
267 /* | |
268 * Calculate an 8-bit (3 red, 3 green, 2 blue) dithered palette of colors | |
269 */ | |
270 void SDL_DitherColors(SDL_Color *colors, int bpp) | |
271 { | |
272 int i; | |
273 if(bpp != 8) | |
274 return; /* only 8bpp supported right now */ | |
275 | |
276 for(i = 0; i < 256; i++) { | |
277 int r, g, b; | |
278 /* map each bit field to the full [0, 255] interval, | |
279 so 0 is mapped to (0, 0, 0) and 255 to (255, 255, 255) */ | |
280 r = i & 0xe0; | |
281 r |= r >> 3 | r >> 6; | |
282 colors[i].r = r; | |
283 g = (i << 3) & 0xe0; | |
284 g |= g >> 3 | g >> 6; | |
285 colors[i].g = g; | |
286 b = i & 0x3; | |
287 b |= b << 2; | |
288 b |= b << 4; | |
289 colors[i].b = b; | |
290 } | |
291 } | |
292 /* | |
293 * Calculate the pad-aligned scanline width of a surface | |
294 */ | |
295 Uint16 SDL_CalculatePitch(SDL_Surface *surface) | |
296 { | |
297 Uint16 pitch; | |
298 | |
299 /* Surface should be 4-byte aligned for speed */ | |
300 pitch = surface->w*surface->format->BytesPerPixel; | |
301 switch (surface->format->BitsPerPixel) { | |
302 case 1: | |
303 pitch = (pitch+7)/8; | |
304 break; | |
305 case 4: | |
306 pitch = (pitch+1)/2; | |
307 break; | |
308 default: | |
309 break; | |
310 } | |
311 pitch = (pitch + 3) & ~3; /* 4-byte aligning */ | |
312 return(pitch); | |
313 } | |
314 /* | |
315 * Match an RGB value to a particular palette index | |
316 */ | |
317 Uint8 SDL_FindColor(SDL_Palette *pal, Uint8 r, Uint8 g, Uint8 b) | |
318 { | |
319 /* Do colorspace distance matching */ | |
320 unsigned int smallest; | |
321 unsigned int distance; | |
322 int rd, gd, bd; | |
323 int i; | |
324 Uint8 pixel=0; | |
325 | |
326 smallest = ~0; | |
327 for ( i=0; i<pal->ncolors; ++i ) { | |
328 rd = pal->colors[i].r - r; | |
329 gd = pal->colors[i].g - g; | |
330 bd = pal->colors[i].b - b; | |
331 distance = (rd*rd)+(gd*gd)+(bd*bd); | |
332 if ( distance < smallest ) { | |
333 pixel = i; | |
334 if ( distance == 0 ) { /* Perfect match! */ | |
335 break; | |
336 } | |
337 smallest = distance; | |
338 } | |
339 } | |
340 return(pixel); | |
341 } | |
342 | |
343 /* Find the opaque pixel value corresponding to an RGB triple */ | |
344 Uint32 SDL_MapRGB(SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b) | |
345 { | |
346 if ( format->palette == NULL ) { | |
347 return (r >> format->Rloss) << format->Rshift | |
348 | (g >> format->Gloss) << format->Gshift | |
349 | (b >> format->Bloss) << format->Bshift | |
350 | format->Amask; | |
351 } else { | |
352 return SDL_FindColor(format->palette, r, g, b); | |
353 } | |
354 } | |
355 | |
356 /* Find the pixel value corresponding to an RGBA quadruple */ | |
357 Uint32 SDL_MapRGBA(SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b, Uint8 a) | |
358 { | |
359 if ( format->palette == NULL ) { | |
360 return (r >> format->Rloss) << format->Rshift | |
361 | (g >> format->Gloss) << format->Gshift | |
362 | (b >> format->Bloss) << format->Bshift | |
363 | ((a >> format->Aloss) << format->Ashift & format->Amask); | |
364 } else { | |
365 return SDL_FindColor(format->palette, r, g, b); | |
366 } | |
367 } | |
368 | |
369 void SDL_GetRGBA(Uint32 pixel, SDL_PixelFormat *fmt, | |
370 Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a) | |
371 { | |
372 if ( fmt->palette == NULL ) { | |
373 /* | |
374 * This makes sure that the result is mapped to the | |
375 * interval [0..255], and the maximum value for each | |
376 * component is 255. This is important to make sure | |
377 * that white is indeed reported as (255, 255, 255), | |
378 * and that opaque alpha is 255. | |
379 * This only works for RGB bit fields at least 4 bit | |
380 * wide, which is almost always the case. | |
381 */ | |
382 unsigned rv, gv, bv, av; | |
383 rv = (pixel & fmt->Rmask) >> fmt->Rshift; | |
384 *r = (rv << fmt->Rloss) + (rv >> (8 - fmt->Rloss)); | |
385 gv = (pixel & fmt->Gmask) >> fmt->Gshift; | |
386 *g = (gv << fmt->Gloss) + (gv >> (8 - fmt->Gloss)); | |
387 bv = (pixel & fmt->Bmask) >> fmt->Bshift; | |
388 *b = (bv << fmt->Bloss) + (bv >> (8 - fmt->Bloss)); | |
389 if(fmt->Amask) { | |
390 av = (pixel & fmt->Amask) >> fmt->Ashift; | |
391 *a = (av << fmt->Aloss) + (av >> (8 - fmt->Aloss)); | |
392 } else | |
393 *a = SDL_ALPHA_OPAQUE; | |
394 } else { | |
395 *r = fmt->palette->colors[pixel].r; | |
396 *g = fmt->palette->colors[pixel].g; | |
397 *b = fmt->palette->colors[pixel].b; | |
398 *a = SDL_ALPHA_OPAQUE; | |
399 } | |
400 } | |
401 | |
402 void SDL_GetRGB(Uint32 pixel, SDL_PixelFormat *fmt, Uint8 *r,Uint8 *g,Uint8 *b) | |
403 { | |
404 if ( fmt->palette == NULL ) { | |
405 /* the note for SDL_GetRGBA above applies here too */ | |
406 unsigned rv, gv, bv; | |
407 rv = (pixel & fmt->Rmask) >> fmt->Rshift; | |
408 *r = (rv << fmt->Rloss) + (rv >> (8 - fmt->Rloss)); | |
409 gv = (pixel & fmt->Gmask) >> fmt->Gshift; | |
410 *g = (gv << fmt->Gloss) + (gv >> (8 - fmt->Gloss)); | |
411 bv = (pixel & fmt->Bmask) >> fmt->Bshift; | |
412 *b = (bv << fmt->Bloss) + (bv >> (8 - fmt->Bloss)); | |
413 } else { | |
414 *r = fmt->palette->colors[pixel].r; | |
415 *g = fmt->palette->colors[pixel].g; | |
416 *b = fmt->palette->colors[pixel].b; | |
417 } | |
418 } | |
419 | |
420 /* Apply gamma to a set of colors - this is easy. :) */ | |
421 void SDL_ApplyGamma(Uint16 *gamma, SDL_Color *colors, SDL_Color *output, | |
422 int ncolors) | |
423 { | |
424 int i; | |
425 | |
426 for ( i=0; i<ncolors; ++i ) { | |
427 output[i].r = gamma[0*256 + colors[i].r] >> 8; | |
428 output[i].g = gamma[1*256 + colors[i].g] >> 8; | |
429 output[i].b = gamma[2*256 + colors[i].b] >> 8; | |
430 } | |
431 } | |
432 | |
433 /* Map from Palette to Palette */ | |
434 static Uint8 *Map1to1(SDL_Palette *src, SDL_Palette *dst, int *identical) | |
435 { | |
436 Uint8 *map; | |
437 int i; | |
438 | |
439 if ( identical ) { | |
440 if ( src->ncolors <= dst->ncolors ) { | |
441 /* If an identical palette, no need to map */ | |
442 if ( memcmp(src->colors, dst->colors, src->ncolors* | |
443 sizeof(SDL_Color)) == 0 ) { | |
444 *identical = 1; | |
445 return(NULL); | |
446 } | |
447 } | |
448 *identical = 0; | |
449 } | |
450 map = (Uint8 *)malloc(src->ncolors); | |
451 if ( map == NULL ) { | |
452 SDL_OutOfMemory(); | |
453 return(NULL); | |
454 } | |
455 for ( i=0; i<src->ncolors; ++i ) { | |
456 map[i] = SDL_FindColor(dst, | |
457 src->colors[i].r, src->colors[i].g, src->colors[i].b); | |
458 } | |
459 return(map); | |
460 } | |
461 /* Map from Palette to BitField */ | |
462 static Uint8 *Map1toN(SDL_Palette *src, SDL_PixelFormat *dst) | |
463 { | |
464 Uint8 *map; | |
465 int i; | |
466 int bpp; | |
50 | 467 unsigned alpha; |
0 | 468 |
469 bpp = ((dst->BytesPerPixel == 3) ? 4 : dst->BytesPerPixel); | |
470 map = (Uint8 *)malloc(src->ncolors*bpp); | |
471 if ( map == NULL ) { | |
472 SDL_OutOfMemory(); | |
473 return(NULL); | |
474 } | |
475 | |
50 | 476 alpha = dst->Amask ? SDL_ALPHA_OPAQUE : 0; |
0 | 477 /* We memory copy to the pixel map so the endianness is preserved */ |
478 for ( i=0; i<src->ncolors; ++i ) { | |
479 ASSEMBLE_RGBA(&map[i*bpp], dst->BytesPerPixel, dst, | |
480 src->colors[i].r, src->colors[i].g, | |
50 | 481 src->colors[i].b, alpha); |
0 | 482 } |
483 return(map); | |
484 } | |
485 /* Map from BitField to Dithered-Palette to Palette */ | |
486 static Uint8 *MapNto1(SDL_PixelFormat *src, SDL_Palette *dst, int *identical) | |
487 { | |
488 /* Generate a 256 color dither palette */ | |
489 SDL_Palette dithered; | |
490 SDL_Color colors[256]; | |
491 | |
492 dithered.ncolors = 256; | |
493 SDL_DitherColors(colors, 8); | |
494 dithered.colors = colors; | |
495 return(Map1to1(&dithered, dst, identical)); | |
496 } | |
497 | |
498 SDL_BlitMap *SDL_AllocBlitMap(void) | |
499 { | |
500 SDL_BlitMap *map; | |
501 | |
502 /* Allocate the empty map */ | |
503 map = (SDL_BlitMap *)malloc(sizeof(*map)); | |
504 if ( map == NULL ) { | |
505 SDL_OutOfMemory(); | |
506 return(NULL); | |
507 } | |
508 memset(map, 0, sizeof(*map)); | |
509 | |
510 /* Allocate the software blit data */ | |
511 map->sw_data = (struct private_swaccel *)malloc(sizeof(*map->sw_data)); | |
512 if ( map->sw_data == NULL ) { | |
513 SDL_FreeBlitMap(map); | |
514 SDL_OutOfMemory(); | |
515 return(NULL); | |
516 } | |
517 memset(map->sw_data, 0, sizeof(*map->sw_data)); | |
518 | |
519 /* It's ready to go */ | |
520 return(map); | |
521 } | |
522 void SDL_InvalidateMap(SDL_BlitMap *map) | |
523 { | |
524 if ( ! map ) { | |
525 return; | |
526 } | |
527 map->dst = NULL; | |
528 map->format_version = (unsigned int)-1; | |
529 if ( map->table ) { | |
530 free(map->table); | |
531 map->table = NULL; | |
532 } | |
533 } | |
534 int SDL_MapSurface (SDL_Surface *src, SDL_Surface *dst) | |
535 { | |
536 SDL_PixelFormat *srcfmt; | |
537 SDL_PixelFormat *dstfmt; | |
538 SDL_BlitMap *map; | |
539 | |
540 /* Clear out any previous mapping */ | |
541 map = src->map; | |
542 if ( (src->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
543 SDL_UnRLESurface(src, 1); | |
544 } | |
545 SDL_InvalidateMap(map); | |
546 | |
547 /* Figure out what kind of mapping we're doing */ | |
548 map->identity = 0; | |
549 srcfmt = src->format; | |
550 dstfmt = dst->format; | |
551 switch (srcfmt->BytesPerPixel) { | |
552 case 1: | |
553 switch (dstfmt->BytesPerPixel) { | |
554 case 1: | |
555 /* Palette --> Palette */ | |
556 /* If both SDL_HWSURFACE, assume have same palette */ | |
557 if ( ((src->flags & SDL_HWSURFACE) == SDL_HWSURFACE) && | |
558 ((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) ) { | |
559 map->identity = 1; | |
560 } else { | |
561 map->table = Map1to1(srcfmt->palette, | |
562 dstfmt->palette, &map->identity); | |
563 } | |
564 if ( ! map->identity ) { | |
565 if ( map->table == NULL ) { | |
566 return(-1); | |
567 } | |
568 } | |
569 if (srcfmt->BitsPerPixel!=dstfmt->BitsPerPixel) | |
570 map->identity = 0; | |
571 break; | |
572 | |
573 default: | |
574 /* Palette --> BitField */ | |
575 map->table = Map1toN(srcfmt->palette, dstfmt); | |
576 if ( map->table == NULL ) { | |
577 return(-1); | |
578 } | |
579 break; | |
580 } | |
581 break; | |
582 default: | |
583 switch (dstfmt->BytesPerPixel) { | |
584 case 1: | |
585 /* BitField --> Palette */ | |
586 map->table = MapNto1(srcfmt, | |
587 dstfmt->palette, &map->identity); | |
588 if ( ! map->identity ) { | |
589 if ( map->table == NULL ) { | |
590 return(-1); | |
591 } | |
592 } | |
593 map->identity = 0; /* Don't optimize to copy */ | |
594 break; | |
595 default: | |
596 /* BitField --> BitField */ | |
597 if ( FORMAT_EQUAL(srcfmt, dstfmt) ) | |
598 map->identity = 1; | |
599 break; | |
600 } | |
601 break; | |
602 } | |
603 | |
604 map->dst = dst; | |
605 map->format_version = dst->format_version; | |
606 | |
607 /* Choose your blitters wisely */ | |
608 return(SDL_CalculateBlit(src)); | |
609 } | |
610 void SDL_FreeBlitMap(SDL_BlitMap *map) | |
611 { | |
612 if ( map ) { | |
613 SDL_InvalidateMap(map); | |
614 if ( map->sw_data != NULL ) { | |
615 free(map->sw_data); | |
616 } | |
617 free(map); | |
618 } | |
619 } |