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comparison src/video/SDL_surface.c @ 1735:8dd28c4ef746 SDL-1.3

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SDL_Rect now uses int for position and size. Added a few more rectangle functions. Added a dirty rectangle list implementation.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 10 Jul 2006 07:34:50 +0000
parents 6c63fc2bd986
children
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1734:f7c667ded87d 1735:8dd28c4ef746
38 SDL_CreateRGBSurface(Uint32 flags, 38 SDL_CreateRGBSurface(Uint32 flags,
39 int width, int height, int depth, 39 int width, int height, int depth,
40 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) 40 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
41 { 41 {
42 SDL_Surface *surface; 42 SDL_Surface *surface;
43
44 /* FIXME!! */
45 /* Make sure the size requested doesn't overflow our datatypes */
46 /* Next time I write a library like SDL, I'll use int for size. :) */
47 if (width >= 16384 || height >= 65536) {
48 SDL_SetError("Width or height is too large");
49 return NULL;
50 }
51 43
52 /* Allocate the surface */ 44 /* Allocate the surface */
53 surface = (SDL_Surface *) SDL_malloc(sizeof(*surface)); 45 surface = (SDL_Surface *) SDL_malloc(sizeof(*surface));
54 if (surface == NULL) { 46 if (surface == NULL) {
55 SDL_OutOfMemory(); 47 SDL_OutOfMemory();
209 SDL_CreateRGBSurface(0, 0, 0, bpp, Rmask, Gmask, Bmask, Amask); 201 SDL_CreateRGBSurface(0, 0, 0, bpp, Rmask, Gmask, Bmask, Amask);
210 if (surface) { 202 if (surface) {
211 surface->flags |= SDL_HWSURFACE; 203 surface->flags |= SDL_HWSURFACE;
212 surface->w = w; 204 surface->w = w;
213 surface->h = h; 205 surface->h = h;
206 surface->pitch = SDL_CalculatePitch(surface);
214 SDL_SetClipRect(surface, NULL); 207 SDL_SetClipRect(surface, NULL);
215 } 208 }
216 } 209 }
217 if (surface) { 210 if (surface) {
218 surface->textureID = textureID; 211 surface->textureID = textureID;
410 } 403 }
411 if (SDL_MUSTLOCK(surface)) { 404 if (SDL_MUSTLOCK(surface)) {
412 SDL_UnlockSurface(surface); 405 SDL_UnlockSurface(surface);
413 } 406 }
414 return 0; 407 return 0;
415 }
416
417 /*
418 * A function to calculate the intersection of two rectangles:
419 * return true if the rectangles intersect, false otherwise
420 */
421 SDL_bool
422 SDL_IntersectRect(const SDL_Rect * A, const SDL_Rect * B,
423 SDL_Rect * intersection)
424 {
425 int Amin, Amax, Bmin, Bmax;
426
427 /* Horizontal intersection */
428 Amin = A->x;
429 Amax = Amin + A->w;
430 Bmin = B->x;
431 Bmax = Bmin + B->w;
432 if (Bmin > Amin)
433 Amin = Bmin;
434 intersection->x = Amin;
435 if (Bmax < Amax)
436 Amax = Bmax;
437 intersection->w = Amax - Amin > 0 ? Amax - Amin : 0;
438
439 /* Vertical intersection */
440 Amin = A->y;
441 Amax = Amin + A->h;
442 Bmin = B->y;
443 Bmax = Bmin + B->h;
444 if (Bmin > Amin)
445 Amin = Bmin;
446 intersection->y = Amin;
447 if (Bmax < Amax)
448 Amax = Bmax;
449 intersection->h = Amax - Amin > 0 ? Amax - Amin : 0;
450
451 return (intersection->w && intersection->h);
452 } 408 }
453 409
454 /* 410 /*
455 * Set the clipping rectangle for a blittable surface 411 * Set the clipping rectangle for a blittable surface
456 */ 412 */