Mercurial > sdl-ios-xcode

comparison src/video/SDL_shape.c @ 4795:6f0bc179771c

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Numerous bug fixes that keep testeyes from crashing and dying.
author Eli Gottlieb <eligottlieb@gmail.com>
date Wed, 14 Jul 2010 00:49:28 -0400
parents a6bc01875d20
children e8caf178d082
comparison
equal deleted inserted replaced
4794:e562160a873f 4795:6f0bc179771c
46 46
47 /* REQUIRES that bitmap point to a w-by-h bitmap with 1bpp. */ 47 /* REQUIRES that bitmap point to a w-by-h bitmap with 1bpp. */
48 void SDL_CalculateShapeBitmap(Uint8 alphacutoff,SDL_Surface *shape,Uint8* bitmap,Uint8 ppb,Uint8 value) { 48 void SDL_CalculateShapeBitmap(Uint8 alphacutoff,SDL_Surface *shape,Uint8* bitmap,Uint8 ppb,Uint8 value) {
49 int x = 0; 49 int x = 0;
50 int y = 0; 50 int y = 0;
51 Uint8 alpha = 0; 51 Uint8 r = 0,g = 0,b = 0,alpha = 0;
52 Uint8* pixel; 52 Uint8* pixel;
53 Uint32 bitmap_pixel; 53 Uint32 bitmap_pixel;
54 if(SDL_MUSTLOCK(shape)) 54 if(SDL_MUSTLOCK(shape))
55 SDL_LockSurface(shape); 55 SDL_LockSurface(shape);
56 for(x = 0;x<shape->w;x++) 56 for(x = 0;x<shape->w;x++)
57 for(y = 0;y<shape->h;y++) { 57 for(y = 0;y<shape->h;y++) {
58 pixel = shape->pixels + (y*shape->pitch) + (x*shape->format->BytesPerPixel); 58 pixel = shape->pixels + (y*shape->pitch) + (x*shape->format->BytesPerPixel);
59 alpha = 0; 59 alpha = 0;
60 SDL_GetRGBA(*(Uint32*)pixel,shape->format,NULL,NULL,NULL,&alpha); 60 SDL_GetRGBA(*(Uint32*)pixel,shape->format,&r,&g,&b,&alpha);
61 Uint32 bitmap_pixel = y*shape->w + x; 61 Uint32 bitmap_pixel = y*shape->w + x;
62 bitmap[bitmap_pixel / ppb] |= (alpha >= alphacutoff ? value : 0) << ((ppb - 1) - (bitmap_pixel % ppb)); 62 bitmap[bitmap_pixel / ppb] |= (alpha >= alphacutoff ? value : 0) << ((ppb - 1) - (bitmap_pixel % ppb));
63 } 63 }
64 if(SDL_MUSTLOCK(shape)) 64 if(SDL_MUSTLOCK(shape))
65 SDL_UnlockSurface(shape); 65 SDL_UnlockSurface(shape);