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1 /*
2     SDL - Simple DirectMedia Layer
3     Copyright (C) 1997-2006 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  */
SDL_CreateRGBSurface(Uint32 flags,int width,int height,int depth,Uint32 Rmask,Uint32 Gmask,Uint32 Bmask,Uint32 Amask)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  */
SDL_CreateRGBSurfaceFrom(void * pixels,int width,int height,int depth,int pitch,Uint32 Rmask,Uint32 Gmask,Uint32 Bmask,Uint32 Amask)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  */
SDL_SetColorKey(SDL_Surface * surface,Uint32 flag,Uint32 key)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 */
SDL_SetAlpha(SDL_Surface * surface,Uint32 flag,Uint8 value)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 }
SDL_SetAlphaChannel(SDL_Surface * surface,Uint8 value)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__
SDL_IntersectRect(const SDL_Rect * A,const SDL_Rect * B,SDL_Rect * intersection)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  */
SDL_SetClipRect(SDL_Surface * surface,const SDL_Rect * rect)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 }
SDL_GetClipRect(SDL_Surface * surface,SDL_Rect * rect)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  */
SDL_LowerBlit(SDL_Surface * src,SDL_Rect * srcrect,SDL_Surface * dst,SDL_Rect * dstrect)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 
SDL_UpperBlit(SDL_Surface * src,SDL_Rect * srcrect,SDL_Surface * dst,SDL_Rect * dstrect)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 
SDL_FillRect1(SDL_Surface * dst,SDL_Rect * dstrect,Uint32 color)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 
SDL_FillRect4(SDL_Surface * dst,SDL_Rect * dstrect,Uint32 color)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  */
SDL_FillRect(SDL_Surface * dst,SDL_Rect * dstrect,Uint32 color)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  */
SDL_LockSurface(SDL_Surface * surface)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  */
SDL_UnlockSurface(SDL_Surface * surface)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  */
SDL_ConvertSurface(SDL_Surface * surface,SDL_PixelFormat * format,Uint32 flags)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  */
SDL_FreeSurface(SDL_Surface * surface)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 }
942