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_sysvideo.h" |
26 | #include "SDL_cursor_c.h" |
27 | #include "SDL_blit.h" |
28 | #include "SDL_RLEaccel_c.h" |
29 | #include "SDL_pixels_c.h" |
30 | #include "SDL_leaks.h" |
31 | |
32 | |
33 | /* Public routines */ |
34 | /* |
35 | * Create an empty RGB surface of the appropriate depth |
36 | */ |
37 | SDL_Surface * SDL_CreateRGBSurface (Uint32 flags, |
38 | int width, int height, int depth, |
39 | Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) |
40 | { |
41 | SDL_VideoDevice *video = current_video; |
42 | SDL_VideoDevice *this = current_video; |
43 | SDL_Surface *screen; |
44 | SDL_Surface *surface; |
45 | |
46 | /* Make sure the size requested doesn't overflow our datatypes */ |
47 | /* Next time I write a library like SDL, I'll use int for size. :) */ |
48 | if ( width >= 16384 || height >= 65536 ) { |
49 | SDL_SetError("Width or height is too large"); |
50 | return(NULL); |
51 | } |
52 | |
53 | /* Check to see if we desire the surface in video memory */ |
54 | if ( video ) { |
55 | screen = SDL_PublicSurface; |
56 | } else { |
57 | screen = NULL; |
58 | } |
59 | if ( screen && ((screen->flags&SDL_HWSURFACE) == SDL_HWSURFACE) ) { |
60 | if ( (flags&(SDL_SRCCOLORKEY|SDL_SRCALPHA)) != 0 ) { |
61 | flags |= SDL_HWSURFACE; |
62 | } |
63 | if ( (flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) { |
64 | if ( ! current_video->info.blit_hw_CC ) { |
65 | flags &= ~SDL_HWSURFACE; |
66 | } |
67 | } |
68 | if ( (flags & SDL_SRCALPHA) == SDL_SRCALPHA ) { |
69 | if ( ! current_video->info.blit_hw_A ) { |
70 | flags &= ~SDL_HWSURFACE; |
71 | } |
72 | } |
73 | } else { |
74 | flags &= ~SDL_HWSURFACE; |
75 | } |
76 | |
77 | /* Allocate the surface */ |
78 | surface = (SDL_Surface *)SDL_malloc(sizeof(*surface)); |
79 | if ( surface == NULL ) { |
80 | SDL_OutOfMemory(); |
81 | return(NULL); |
82 | } |
83 | surface->flags = SDL_SWSURFACE; |
84 | if ( (flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { |
85 | if ((Amask) && (video->displayformatalphapixel)) |
86 | { |
87 | depth = video->displayformatalphapixel->BitsPerPixel; |
88 | Rmask = video->displayformatalphapixel->Rmask; |
89 | Gmask = video->displayformatalphapixel->Gmask; |
90 | Bmask = video->displayformatalphapixel->Bmask; |
91 | Amask = video->displayformatalphapixel->Amask; |
92 | } |
93 | else |
94 | { |
95 | depth = screen->format->BitsPerPixel; |
96 | Rmask = screen->format->Rmask; |
97 | Gmask = screen->format->Gmask; |
98 | Bmask = screen->format->Bmask; |
99 | Amask = screen->format->Amask; |
100 | } |
101 | } |
102 | surface->format = SDL_AllocFormat(depth, Rmask, Gmask, Bmask, Amask); |
103 | if ( surface->format == NULL ) { |
104 | SDL_free(surface); |
105 | return(NULL); |
106 | } |
107 | if ( Amask ) { |
108 | surface->flags |= SDL_SRCALPHA; |
109 | } |
110 | surface->w = width; |
111 | surface->h = height; |
112 | surface->pitch = SDL_CalculatePitch(surface); |
113 | surface->pixels = NULL; |
114 | surface->offset = 0; |
115 | surface->hwdata = NULL; |
116 | surface->locked = 0; |
117 | surface->map = NULL; |
118 | surface->unused1 = 0; |
119 | SDL_SetClipRect(surface, NULL); |
120 | SDL_FormatChanged(surface); |
121 | |
122 | /* Get the pixels */ |
123 | if ( ((flags&SDL_HWSURFACE) == SDL_SWSURFACE) || |
124 | (video->AllocHWSurface(this, surface) < 0) ) { |
125 | if ( surface->w && surface->h ) { |
126 | surface->pixels = SDL_malloc(surface->h*surface->pitch); |
127 | if ( surface->pixels == NULL ) { |
128 | SDL_FreeSurface(surface); |
129 | SDL_OutOfMemory(); |
130 | return(NULL); |
131 | } |
132 | /* This is important for bitmaps */ |
133 | SDL_memset(surface->pixels, 0, surface->h*surface->pitch); |
134 | } |
135 | } |
136 | |
137 | /* Allocate an empty mapping */ |
138 | surface->map = SDL_AllocBlitMap(); |
139 | if ( surface->map == NULL ) { |
140 | SDL_FreeSurface(surface); |
141 | return(NULL); |
142 | } |
143 | |
144 | /* The surface is ready to go */ |
145 | surface->refcount = 1; |
146 | #ifdef CHECK_LEAKS |
147 | ++surfaces_allocated; |
148 | #endif |
149 | return(surface); |
150 | } |
151 | /* |
152 | * Create an RGB surface from an existing memory buffer |
153 | */ |
154 | SDL_Surface * SDL_CreateRGBSurfaceFrom (void *pixels, |
155 | int width, int height, int depth, int pitch, |
156 | Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) |
157 | { |
158 | SDL_Surface *surface; |
159 | |
160 | surface = SDL_CreateRGBSurface(SDL_SWSURFACE, 0, 0, depth, |
161 | Rmask, Gmask, Bmask, Amask); |
162 | if ( surface != NULL ) { |
163 | surface->flags |= SDL_PREALLOC; |
164 | surface->pixels = pixels; |
165 | surface->w = width; |
166 | surface->h = height; |
167 | surface->pitch = pitch; |
168 | SDL_SetClipRect(surface, NULL); |
169 | } |
170 | return(surface); |
171 | } |
172 | /* |
173 | * Set the color key in a blittable surface |
174 | */ |
175 | int SDL_SetColorKey (SDL_Surface *surface, Uint32 flag, Uint32 key) |
176 | { |
177 | /* Sanity check the flag as it gets passed in */ |
178 | if ( flag & SDL_SRCCOLORKEY ) { |
179 | if ( flag & (SDL_RLEACCEL|SDL_RLEACCELOK) ) { |
180 | flag = (SDL_SRCCOLORKEY | SDL_RLEACCELOK); |
181 | } else { |
182 | flag = SDL_SRCCOLORKEY; |
183 | } |
184 | } else { |
185 | flag = 0; |
186 | } |
187 | |
188 | /* Optimize away operations that don't change anything */ |
189 | if ( (flag == (surface->flags & (SDL_SRCCOLORKEY|SDL_RLEACCELOK))) && |
190 | (key == surface->format->colorkey) ) { |
191 | return(0); |
192 | } |
193 | |
194 | /* UnRLE surfaces before we change the colorkey */ |
195 | if ( surface->flags & SDL_RLEACCEL ) { |
196 | SDL_UnRLESurface(surface, 1); |
197 | } |
198 | |
199 | if ( flag ) { |
200 | SDL_VideoDevice *video = current_video; |
201 | SDL_VideoDevice *this = current_video; |
202 | |
203 | |
204 | surface->flags |= SDL_SRCCOLORKEY; |
205 | surface->format->colorkey = key; |
206 | if ( (surface->flags & SDL_HWACCEL) == SDL_HWACCEL ) { |
207 | if ( (video->SetHWColorKey == NULL) || |
208 | (video->SetHWColorKey(this, surface, key) < 0) ) { |
209 | surface->flags &= ~SDL_HWACCEL; |
210 | } |
211 | } |
212 | if ( flag & SDL_RLEACCELOK ) { |
213 | surface->flags |= SDL_RLEACCELOK; |
214 | } else { |
215 | surface->flags &= ~SDL_RLEACCELOK; |
216 | } |
217 | } else { |
218 | surface->flags &= ~(SDL_SRCCOLORKEY|SDL_RLEACCELOK); |
219 | surface->format->colorkey = 0; |
220 | } |
221 | SDL_InvalidateMap(surface->map); |
222 | return(0); |
223 | } |
224 | /* This function sets the alpha channel of a surface */ |
225 | int SDL_SetAlpha (SDL_Surface *surface, Uint32 flag, Uint8 value) |
226 | { |
227 | Uint32 oldflags = surface->flags; |
228 | Uint32 oldalpha = surface->format->alpha; |
229 | |
230 | /* Sanity check the flag as it gets passed in */ |
231 | if ( flag & SDL_SRCALPHA ) { |
232 | if ( flag & (SDL_RLEACCEL|SDL_RLEACCELOK) ) { |
233 | flag = (SDL_SRCALPHA | SDL_RLEACCELOK); |
234 | } else { |
235 | flag = SDL_SRCALPHA; |
236 | } |
237 | } else { |
238 | flag = 0; |
239 | } |
240 | |
241 | /* Optimize away operations that don't change anything */ |
242 | if ( (flag == (surface->flags & (SDL_SRCALPHA|SDL_RLEACCELOK))) && |
243 | (!flag || value == oldalpha) ) { |
244 | return(0); |
245 | } |
246 | |
247 | if(!(flag & SDL_RLEACCELOK) && (surface->flags & SDL_RLEACCEL)) |
248 | SDL_UnRLESurface(surface, 1); |
249 | |
250 | if ( flag ) { |
251 | SDL_VideoDevice *video = current_video; |
252 | SDL_VideoDevice *this = current_video; |
253 | |
254 | surface->flags |= SDL_SRCALPHA; |
255 | surface->format->alpha = value; |
256 | if ( (surface->flags & SDL_HWACCEL) == SDL_HWACCEL ) { |
257 | if ( (video->SetHWAlpha == NULL) || |
258 | (video->SetHWAlpha(this, surface, value) < 0) ) { |
259 | surface->flags &= ~SDL_HWACCEL; |
260 | } |
261 | } |
262 | if ( flag & SDL_RLEACCELOK ) { |
263 | surface->flags |= SDL_RLEACCELOK; |
264 | } else { |
265 | surface->flags &= ~SDL_RLEACCELOK; |
266 | } |
267 | } else { |
268 | surface->flags &= ~SDL_SRCALPHA; |
269 | surface->format->alpha = SDL_ALPHA_OPAQUE; |
270 | } |
271 | /* |
272 | * The representation for software surfaces is independent of |
273 | * per-surface alpha, so no need to invalidate the blit mapping |
274 | * if just the alpha value was changed. (If either is 255, we still |
275 | * need to invalidate.) |
276 | */ |
277 | if((surface->flags & SDL_HWACCEL) == SDL_HWACCEL |
278 | || oldflags != surface->flags |
279 | || (((oldalpha + 1) ^ (value + 1)) & 0x100)) |
280 | SDL_InvalidateMap(surface->map); |
281 | return(0); |
282 | } |
283 | int SDL_SetAlphaChannel(SDL_Surface *surface, Uint8 value) |
284 | { |
285 | int row, col; |
286 | int offset; |
287 | Uint8 *buf; |
288 | |
289 | if ( (surface->format->Amask != 0xFF000000) && |
290 | (surface->format->Amask != 0x000000FF) ) { |
291 | SDL_SetError("Unsupported surface alpha mask format"); |
292 | return -1; |
293 | } |
294 | |
295 | #if SDL_BYTEORDER == SDL_LIL_ENDIAN |
296 | if ( surface->format->Amask == 0xFF000000 ) { |
297 | offset = 3; |
298 | } else { |
299 | offset = 0; |
300 | } |
301 | #else |
302 | if ( surface->format->Amask == 0xFF000000 ) { |
303 | offset = 0; |
304 | } else { |
305 | offset = 3; |
306 | } |
307 | #endif /* Byte ordering */ |
308 | |
309 | /* Quickly set the alpha channel of an RGBA or ARGB surface */ |
310 | if ( SDL_MUSTLOCK(surface) ) { |
311 | if ( SDL_LockSurface(surface) < 0 ) { |
312 | return -1; |
313 | } |
314 | } |
315 | row = surface->h; |
316 | while (row--) { |
317 | col = surface->w; |
318 | buf = (Uint8 *)surface->pixels + row * surface->pitch + offset; |
319 | while(col--) { |
320 | *buf = value; |
321 | buf += 4; |
322 | } |
323 | } |
324 | if ( SDL_MUSTLOCK(surface) ) { |
325 | SDL_UnlockSurface(surface); |
326 | } |
327 | return 0; |
328 | } |
329 | |
330 | /* |
331 | * A function to calculate the intersection of two rectangles: |
332 | * return true if the rectangles intersect, false otherwise |
333 | */ |
334 | static __inline__ |
335 | SDL_bool SDL_IntersectRect(const SDL_Rect *A, const SDL_Rect *B, SDL_Rect *intersection) |
336 | { |
337 | int Amin, Amax, Bmin, Bmax; |
338 | |
339 | /* Horizontal intersection */ |
340 | Amin = A->x; |
341 | Amax = Amin + A->w; |
342 | Bmin = B->x; |
343 | Bmax = Bmin + B->w; |
344 | if(Bmin > Amin) |
345 | Amin = Bmin; |
346 | intersection->x = Amin; |
347 | if(Bmax < Amax) |
348 | Amax = Bmax; |
349 | intersection->w = Amax - Amin > 0 ? Amax - Amin : 0; |
350 | |
351 | /* Vertical intersection */ |
352 | Amin = A->y; |
353 | Amax = Amin + A->h; |
354 | Bmin = B->y; |
355 | Bmax = Bmin + B->h; |
356 | if(Bmin > Amin) |
357 | Amin = Bmin; |
358 | intersection->y = Amin; |
359 | if(Bmax < Amax) |
360 | Amax = Bmax; |
361 | intersection->h = Amax - Amin > 0 ? Amax - Amin : 0; |
362 | |
363 | return (intersection->w && intersection->h); |
364 | } |
365 | /* |
366 | * Set the clipping rectangle for a blittable surface |
367 | */ |
368 | SDL_bool SDL_SetClipRect(SDL_Surface *surface, const SDL_Rect *rect) |
369 | { |
370 | SDL_Rect full_rect; |
371 | |
372 | /* Don't do anything if there's no surface to act on */ |
373 | if ( ! surface ) { |
374 | return SDL_FALSE; |
375 | } |
376 | |
377 | /* Set up the full surface rectangle */ |
378 | full_rect.x = 0; |
379 | full_rect.y = 0; |
380 | full_rect.w = surface->w; |
381 | full_rect.h = surface->h; |
382 | |
383 | /* Set the clipping rectangle */ |
384 | if ( ! rect ) { |
385 | surface->clip_rect = full_rect; |
386 | return 1; |
387 | } |
388 | return SDL_IntersectRect(rect, &full_rect, &surface->clip_rect); |
389 | } |
390 | void SDL_GetClipRect(SDL_Surface *surface, SDL_Rect *rect) |
391 | { |
392 | if ( surface && rect ) { |
393 | *rect = surface->clip_rect; |
394 | } |
395 | } |
396 | /* |
397 | * Set up a blit between two surfaces -- split into three parts: |
398 | * The upper part, SDL_UpperBlit(), performs clipping and rectangle |
399 | * verification. The lower part is a pointer to a low level |
400 | * accelerated blitting function. |
401 | * |
402 | * These parts are separated out and each used internally by this |
403 | * library in the optimimum places. They are exported so that if |
404 | * you know exactly what you are doing, you can optimize your code |
405 | * by calling the one(s) you need. |
406 | */ |
407 | int SDL_LowerBlit (SDL_Surface *src, SDL_Rect *srcrect, |
408 | SDL_Surface *dst, SDL_Rect *dstrect) |
409 | { |
410 | SDL_blit do_blit; |
411 | SDL_Rect hw_srcrect; |
412 | SDL_Rect hw_dstrect; |
413 | |
414 | /* Check to make sure the blit mapping is valid */ |
415 | if ( (src->map->dst != dst) || |
416 | (src->map->dst->format_version != src->map->format_version) ) { |
417 | if ( SDL_MapSurface(src, dst) < 0 ) { |
418 | return(-1); |
419 | } |
420 | } |
421 | |
422 | /* Figure out which blitter to use */ |
423 | if ( (src->flags & SDL_HWACCEL) == SDL_HWACCEL ) { |
424 | if ( src == SDL_VideoSurface ) { |
425 | hw_srcrect = *srcrect; |
426 | hw_srcrect.x += current_video->offset_x; |
427 | hw_srcrect.y += current_video->offset_y; |
428 | srcrect = &hw_srcrect; |
429 | } |
430 | if ( dst == SDL_VideoSurface ) { |
431 | hw_dstrect = *dstrect; |
432 | hw_dstrect.x += current_video->offset_x; |
433 | hw_dstrect.y += current_video->offset_y; |
434 | dstrect = &hw_dstrect; |
435 | } |
436 | do_blit = src->map->hw_blit; |
437 | } else { |
438 | do_blit = src->map->sw_blit; |
439 | } |
440 | return(do_blit(src, srcrect, dst, dstrect)); |
441 | } |
442 | |
443 | |
444 | int SDL_UpperBlit (SDL_Surface *src, SDL_Rect *srcrect, |
445 | SDL_Surface *dst, SDL_Rect *dstrect) |
446 | { |
447 | SDL_Rect fulldst; |
448 | int srcx, srcy, w, h; |
449 | |
450 | /* Make sure the surfaces aren't locked */ |
451 | if ( ! src || ! dst ) { |
452 | SDL_SetError("SDL_UpperBlit: passed a NULL surface"); |
453 | return(-1); |
454 | } |
455 | if ( src->locked || dst->locked ) { |
456 | SDL_SetError("Surfaces must not be locked during blit"); |
457 | return(-1); |
458 | } |
459 | |
460 | /* If the destination rectangle is NULL, use the entire dest surface */ |
461 | if ( dstrect == NULL ) { |
462 | fulldst.x = fulldst.y = 0; |
463 | dstrect = &fulldst; |
464 | } |
465 | |
466 | /* clip the source rectangle to the source surface */ |
467 | if(srcrect) { |
468 | int maxw, maxh; |
469 | |
470 | srcx = srcrect->x; |
471 | w = srcrect->w; |
472 | if(srcx < 0) { |
473 | w += srcx; |
474 | dstrect->x -= srcx; |
475 | srcx = 0; |
476 | } |
477 | maxw = src->w - srcx; |
478 | if(maxw < w) |
479 | w = maxw; |
480 | |
481 | srcy = srcrect->y; |
482 | h = srcrect->h; |
483 | if(srcy < 0) { |
484 | h += srcy; |
485 | dstrect->y -= srcy; |
486 | srcy = 0; |
487 | } |
488 | maxh = src->h - srcy; |
489 | if(maxh < h) |
490 | h = maxh; |
491 | |
492 | } else { |
493 | srcx = srcy = 0; |
494 | w = src->w; |
495 | h = src->h; |
496 | } |
497 | |
498 | /* clip the destination rectangle against the clip rectangle */ |
499 | { |
500 | SDL_Rect *clip = &dst->clip_rect; |
501 | int dx, dy; |
502 | |
503 | dx = clip->x - dstrect->x; |
504 | if(dx > 0) { |
505 | w -= dx; |
506 | dstrect->x += dx; |
507 | srcx += dx; |
508 | } |
509 | dx = dstrect->x + w - clip->x - clip->w; |
510 | if(dx > 0) |
511 | w -= dx; |
512 | |
513 | dy = clip->y - dstrect->y; |
514 | if(dy > 0) { |
515 | h -= dy; |
516 | dstrect->y += dy; |
517 | srcy += dy; |
518 | } |
519 | dy = dstrect->y + h - clip->y - clip->h; |
520 | if(dy > 0) |
521 | h -= dy; |
522 | } |
523 | |
524 | if(w > 0 && h > 0) { |
525 | SDL_Rect sr; |
526 | sr.x = srcx; |
527 | sr.y = srcy; |
528 | sr.w = dstrect->w = w; |
529 | sr.h = dstrect->h = h; |
530 | return SDL_LowerBlit(src, &sr, dst, dstrect); |
531 | } |
532 | dstrect->w = dstrect->h = 0; |
533 | return 0; |
534 | } |
535 | |
536 | static int SDL_FillRect1(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color) |
537 | { |
538 | /* FIXME: We have to worry about packing order.. *sigh* */ |
539 | SDL_SetError("1-bpp rect fill not yet implemented"); |
540 | return -1; |
541 | } |
542 | |
543 | static int SDL_FillRect4(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color) |
544 | { |
545 | /* FIXME: We have to worry about packing order.. *sigh* */ |
546 | SDL_SetError("4-bpp rect fill not yet implemented"); |
547 | return -1; |
548 | } |
549 | |
550 | /* |
551 | * This function performs a fast fill of the given rectangle with 'color' |
552 | */ |
553 | int SDL_FillRect(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color) |
554 | { |
555 | SDL_VideoDevice *video = current_video; |
556 | SDL_VideoDevice *this = current_video; |
557 | int x, y; |
558 | Uint8 *row; |
559 | |
560 | /* This function doesn't work on surfaces < 8 bpp */ |
561 | if ( dst->format->BitsPerPixel < 8 ) { |
562 | switch(dst->format->BitsPerPixel) { |
563 | case 1: |
564 | return SDL_FillRect1(dst, dstrect, color); |
565 | break; |
566 | case 4: |
567 | return SDL_FillRect4(dst, dstrect, color); |
568 | break; |
569 | default: |
570 | SDL_SetError("Fill rect on unsupported surface format"); |
571 | return(-1); |
572 | break; |
573 | } |
574 | } |
575 | |
576 | /* If 'dstrect' == NULL, then fill the whole surface */ |
577 | if ( dstrect ) { |
578 | /* Perform clipping */ |
579 | if ( !SDL_IntersectRect(dstrect, &dst->clip_rect, dstrect) ) { |
580 | return(0); |
581 | } |
582 | } else { |
583 | dstrect = &dst->clip_rect; |
584 | } |
585 | |
586 | /* Check for hardware acceleration */ |
587 | if ( ((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) && |
588 | video->info.blit_fill ) { |
589 | SDL_Rect hw_rect; |
590 | if ( dst == SDL_VideoSurface ) { |
591 | hw_rect = *dstrect; |
592 | hw_rect.x += current_video->offset_x; |
593 | hw_rect.y += current_video->offset_y; |
594 | dstrect = &hw_rect; |
595 | } |
596 | return(video->FillHWRect(this, dst, dstrect, color)); |
597 | } |
598 | |
599 | /* Perform software fill */ |
600 | if ( SDL_LockSurface(dst) != 0 ) { |
601 | return(-1); |
602 | } |
603 | row = (Uint8 *)dst->pixels+dstrect->y*dst->pitch+ |
604 | dstrect->x*dst->format->BytesPerPixel; |
605 | if ( dst->format->palette || (color == 0) ) { |
606 | x = dstrect->w*dst->format->BytesPerPixel; |
607 | if ( !color && !((uintptr_t)row&3) && !(x&3) && !(dst->pitch&3) ) { |
608 | int n = x >> 2; |
609 | for ( y=dstrect->h; y; --y ) { |
610 | SDL_memset4(row, 0, n); |
611 | row += dst->pitch; |
612 | } |
613 | } else { |
614 | #ifdef __powerpc__ |
615 | /* |
616 | * SDL_memset() on PPC (both glibc and codewarrior) uses |
617 | * the dcbz (Data Cache Block Zero) instruction, which |
618 | * causes an alignment exception if the destination is |
619 | * uncachable, so only use it on software surfaces |
620 | */ |
621 | if((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) { |
622 | if(dstrect->w >= 8) { |
623 | /* |
624 | * 64-bit stores are probably most |
625 | * efficient to uncached video memory |
626 | */ |
627 | double fill; |
628 | SDL_memset(&fill, color, (sizeof fill)); |
629 | for(y = dstrect->h; y; y--) { |
630 | Uint8 *d = row; |
631 | unsigned n = x; |
632 | unsigned nn; |
633 | Uint8 c = color; |
634 | double f = fill; |
635 | while((unsigned long)d |
636 | & (sizeof(double) - 1)) { |
637 | *d++ = c; |
638 | n--; |
639 | } |
640 | nn = n / (sizeof(double) * 4); |
641 | while(nn) { |
642 | ((double *)d)[0] = f; |
643 | ((double *)d)[1] = f; |
644 | ((double *)d)[2] = f; |
645 | ((double *)d)[3] = f; |
646 | d += 4*sizeof(double); |
647 | nn--; |
648 | } |
649 | n &= ~(sizeof(double) * 4 - 1); |
650 | nn = n / sizeof(double); |
651 | while(nn) { |
652 | *(double *)d = f; |
653 | d += sizeof(double); |
654 | nn--; |
655 | } |
656 | n &= ~(sizeof(double) - 1); |
657 | while(n) { |
658 | *d++ = c; |
659 | n--; |
660 | } |
661 | row += dst->pitch; |
662 | } |
663 | } else { |
664 | /* narrow boxes */ |
665 | for(y = dstrect->h; y; y--) { |
666 | Uint8 *d = row; |
667 | Uint8 c = color; |
668 | int n = x; |
669 | while(n) { |
670 | *d++ = c; |
671 | n--; |
672 | } |
673 | row += dst->pitch; |
674 | } |
675 | } |
676 | } else |
677 | #endif /* __powerpc__ */ |
678 | { |
679 | for(y = dstrect->h; y; y--) { |
680 | SDL_memset(row, color, x); |
681 | row += dst->pitch; |
682 | } |
683 | } |
684 | } |
685 | } else { |
686 | switch (dst->format->BytesPerPixel) { |
687 | case 2: |
688 | for ( y=dstrect->h; y; --y ) { |
689 | Uint16 *pixels = (Uint16 *)row; |
690 | Uint16 c = (Uint16)color; |
691 | Uint32 cc = (Uint32)c << 16 | c; |
692 | int n = dstrect->w; |
693 | if((uintptr_t)pixels & 3) { |
694 | *pixels++ = c; |
695 | n--; |
696 | } |
697 | if(n >> 1) |
698 | SDL_memset4(pixels, cc, n >> 1); |
699 | if(n & 1) |
700 | pixels[n - 1] = c; |
701 | row += dst->pitch; |
702 | } |
703 | break; |
704 | |
705 | case 3: |
706 | #if SDL_BYTEORDER == SDL_BIG_ENDIAN |
707 | color <<= 8; |
708 | #endif |
709 | for ( y=dstrect->h; y; --y ) { |
710 | Uint8 *pixels = row; |
711 | for ( x=dstrect->w; x; --x ) { |
712 | SDL_memcpy(pixels, &color, 3); |
713 | pixels += 3; |
714 | } |
715 | row += dst->pitch; |
716 | } |
717 | break; |
718 | |
719 | case 4: |
720 | for(y = dstrect->h; y; --y) { |
721 | SDL_memset4(row, color, dstrect->w); |
722 | row += dst->pitch; |
723 | } |
724 | break; |
725 | } |
726 | } |
727 | SDL_UnlockSurface(dst); |
728 | |
729 | /* We're done! */ |
730 | return(0); |
731 | } |
732 | |
733 | /* |
734 | * Lock a surface to directly access the pixels |
735 | */ |
736 | int SDL_LockSurface (SDL_Surface *surface) |
737 | { |
738 | if ( ! surface->locked ) { |
739 | /* Perform the lock */ |
740 | if ( surface->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) { |
741 | SDL_VideoDevice *video = current_video; |
742 | SDL_VideoDevice *this = current_video; |
743 | if ( video->LockHWSurface(this, surface) < 0 ) { |
744 | return(-1); |
745 | } |
746 | } |
747 | if ( surface->flags & SDL_RLEACCEL ) { |
748 | SDL_UnRLESurface(surface, 1); |
749 | surface->flags |= SDL_RLEACCEL; /* save accel'd state */ |
750 | } |
751 | /* This needs to be done here in case pixels changes value */ |
752 | surface->pixels = (Uint8 *)surface->pixels + surface->offset; |
753 | } |
754 | |
755 | /* Increment the surface lock count, for recursive locks */ |
756 | ++surface->locked; |
757 | |
758 | /* Ready to go.. */ |
759 | return(0); |
760 | } |
761 | /* |
762 | * Unlock a previously locked surface |
763 | */ |
764 | void SDL_UnlockSurface (SDL_Surface *surface) |
765 | { |
766 | /* Only perform an unlock if we are locked */ |
767 | if ( ! surface->locked || (--surface->locked > 0) ) { |
768 | return; |
769 | } |
770 | |
771 | /* Perform the unlock */ |
772 | surface->pixels = (Uint8 *)surface->pixels - surface->offset; |
773 | |
774 | /* Unlock hardware or accelerated surfaces */ |
775 | if ( surface->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) { |
776 | SDL_VideoDevice *video = current_video; |
777 | SDL_VideoDevice *this = current_video; |
778 | video->UnlockHWSurface(this, surface); |
779 | } else { |
780 | /* Update RLE encoded surface with new data */ |
781 | if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { |
782 | surface->flags &= ~SDL_RLEACCEL; /* stop lying */ |
783 | SDL_RLESurface(surface); |
784 | } |
785 | } |
786 | } |
787 | |
788 | /* |
789 | * Convert a surface into the specified pixel format. |
790 | */ |
791 | SDL_Surface * SDL_ConvertSurface (SDL_Surface *surface, |
792 | SDL_PixelFormat *format, Uint32 flags) |
793 | { |
794 | SDL_Surface *convert; |
795 | Uint32 colorkey = 0; |
796 | Uint8 alpha = 0; |
797 | Uint32 surface_flags; |
798 | SDL_Rect bounds; |
799 | |
800 | /* Check for empty destination palette! (results in empty image) */ |
801 | if ( format->palette != NULL ) { |
802 | int i; |
803 | for ( i=0; i<format->palette->ncolors; ++i ) { |
804 | if ( (format->palette->colors[i].r != 0) || |
805 | (format->palette->colors[i].g != 0) || |
806 | (format->palette->colors[i].b != 0) ) |
807 | break; |
808 | } |
809 | if ( i == format->palette->ncolors ) { |
810 | SDL_SetError("Empty destination palette"); |
811 | return(NULL); |
812 | } |
813 | } |
814 | |
815 | /* Only create hw surfaces with alpha channel if hw alpha blits |
816 | are supported */ |
817 | if(format->Amask != 0 && (flags & SDL_HWSURFACE)) { |
818 | const SDL_VideoInfo *vi = SDL_GetVideoInfo(); |
819 | if(!vi || !vi->blit_hw_A) |
820 | flags &= ~SDL_HWSURFACE; |
821 | } |
822 | |
823 | /* Create a new surface with the desired format */ |
824 | convert = SDL_CreateRGBSurface(flags, |
825 | surface->w, surface->h, format->BitsPerPixel, |
826 | format->Rmask, format->Gmask, format->Bmask, format->Amask); |
827 | if ( convert == NULL ) { |
828 | return(NULL); |
829 | } |
830 | |
831 | /* Copy the palette if any */ |
832 | if ( format->palette && convert->format->palette ) { |
833 | SDL_memcpy(convert->format->palette->colors, |
834 | format->palette->colors, |
835 | format->palette->ncolors*sizeof(SDL_Color)); |
836 | convert->format->palette->ncolors = format->palette->ncolors; |
837 | } |
838 | |
839 | /* Save the original surface color key and alpha */ |
840 | surface_flags = surface->flags; |
841 | if ( (surface_flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) { |
842 | /* Convert colourkeyed surfaces to RGBA if requested */ |
843 | if((flags & SDL_SRCCOLORKEY) != SDL_SRCCOLORKEY |
844 | && format->Amask) { |
845 | surface_flags &= ~SDL_SRCCOLORKEY; |
846 | } else { |
847 | colorkey = surface->format->colorkey; |
848 | SDL_SetColorKey(surface, 0, 0); |
849 | } |
850 | } |
851 | if ( (surface_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) { |
852 | /* Copy over the alpha channel to RGBA if requested */ |
853 | if ( format->Amask ) { |
854 | surface->flags &= ~SDL_SRCALPHA; |
855 | } else { |
856 | alpha = surface->format->alpha; |
857 | SDL_SetAlpha(surface, 0, 0); |
858 | } |
859 | } |
860 | |
861 | /* Copy over the image data */ |
862 | bounds.x = 0; |
863 | bounds.y = 0; |
864 | bounds.w = surface->w; |
865 | bounds.h = surface->h; |
866 | SDL_LowerBlit(surface, &bounds, convert, &bounds); |
867 | |
868 | /* Clean up the original surface, and update converted surface */ |
869 | if ( convert != NULL ) { |
870 | SDL_SetClipRect(convert, &surface->clip_rect); |
871 | } |
872 | if ( (surface_flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) { |
873 | Uint32 cflags = surface_flags&(SDL_SRCCOLORKEY|SDL_RLEACCELOK); |
874 | if ( convert != NULL ) { |
875 | Uint8 keyR, keyG, keyB; |
876 | |
877 | SDL_GetRGB(colorkey,surface->format,&keyR,&keyG,&keyB); |
878 | SDL_SetColorKey(convert, cflags|(flags&SDL_RLEACCELOK), |
879 | SDL_MapRGB(convert->format, keyR, keyG, keyB)); |
880 | } |
881 | SDL_SetColorKey(surface, cflags, colorkey); |
882 | } |
883 | if ( (surface_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) { |
884 | Uint32 aflags = surface_flags&(SDL_SRCALPHA|SDL_RLEACCELOK); |
885 | if ( convert != NULL ) { |
886 | SDL_SetAlpha(convert, aflags|(flags&SDL_RLEACCELOK), |
887 | alpha); |
888 | } |
889 | if ( format->Amask ) { |
890 | surface->flags |= SDL_SRCALPHA; |
891 | } else { |
892 | SDL_SetAlpha(surface, aflags, alpha); |
893 | } |
894 | } |
895 | |
896 | /* We're ready to go! */ |
897 | return(convert); |
898 | } |
899 | |
900 | /* |
901 | * Free a surface created by the above function. |
902 | */ |
903 | void SDL_FreeSurface (SDL_Surface *surface) |
904 | { |
905 | /* Free anything that's not NULL, and not the screen surface */ |
906 | if ((surface == NULL) || |
907 | (current_video && |
908 | ((surface == SDL_ShadowSurface)||(surface == SDL_VideoSurface)))) { |
909 | return; |
910 | } |
911 | if ( --surface->refcount > 0 ) { |
912 | return; |
913 | } |
914 | while ( surface->locked > 0 ) { |
915 | SDL_UnlockSurface(surface); |
916 | } |
917 | if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { |
918 | SDL_UnRLESurface(surface, 0); |
919 | } |
920 | if ( surface->format ) { |
921 | SDL_FreeFormat(surface->format); |
922 | surface->format = NULL; |
923 | } |
924 | if ( surface->map != NULL ) { |
925 | SDL_FreeBlitMap(surface->map); |
926 | surface->map = NULL; |
927 | } |
928 | if ( surface->hwdata ) { |
929 | SDL_VideoDevice *video = current_video; |
930 | SDL_VideoDevice *this = current_video; |
931 | video->FreeHWSurface(this, surface); |
932 | } |
933 | if ( surface->pixels && |
934 | ((surface->flags & SDL_PREALLOC) != SDL_PREALLOC) ) { |
935 | SDL_free(surface->pixels); |
936 | } |
937 | SDL_free(surface); |
938 | #ifdef CHECK_LEAKS |
939 | --surfaces_allocated; |
940 | #endif |
941 | } |