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comparison test/testalpha.c @ 2806:938aa47f903a

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Fixed testalpha screen clear for screen formats with an alpha channel
author Sam Lantinga <slouken@libsdl.org>
date Sat, 29 Nov 2008 11:24:18 +0000
parents bbf3aac2672a
children cf271ff76061
comparison
equal deleted inserted replaced
2805:2ed5ff5373d8 2806:938aa47f903a
34 SDL_GetError()); 34 SDL_GetError());
35 quit(2); 35 quit(2);
36 } 36 }
37 buffer = (Uint8 *) screen->pixels; 37 buffer = (Uint8 *) screen->pixels;
38 switch (screen->format->BytesPerPixel) { 38 switch (screen->format->BytesPerPixel) {
39 case 1: 39 case 1:
40 case 3: 40 case 3:
41 for (i = 0; i < screen->h; ++i) { 41 for (i = 0; i < screen->h; ++i) {
42 memset(buffer, (i * 255) / screen->h, 42 memset(buffer, (i * 255) / screen->h,
43 screen->w * screen->format->BytesPerPixel); 43 screen->w * screen->format->BytesPerPixel);
44 buffer += screen->pitch; 44 buffer += screen->pitch;
45 }
46 break;
47 case 2:
48 for (i = 0; i < screen->h; ++i) {
49 Uint16 *buffer16;
50 Uint16 color;
51
52 gradient = ((i * 255) / screen->h);
53 color = (Uint16) SDL_MapRGB(screen->format,
54 gradient, gradient, gradient);
55 buffer16 = (Uint16 *) buffer;
56 for (k = 0; k < screen->w; k++) {
57 *buffer16++ = color;
45 } 58 }
46 break; 59 buffer += screen->pitch;
47 case 2: 60 }
48 for (i = 0; i < screen->h; ++i) { 61 break;
49 Uint16 *buffer16; 62 case 4:
50 Uint16 color; 63 for (i = 0; i < screen->h; ++i) {
51 64 Uint32 *buffer32;
52 gradient = ((i * 255) / screen->h); 65 Uint32 color;
53 color = (Uint16) SDL_MapRGB(screen->format, 66
54 gradient, gradient, gradient); 67 gradient = ((i * 255) / screen->h);
55 buffer16 = (Uint16 *) buffer; 68 color = SDL_MapRGB(screen->format, gradient, gradient, gradient);
56 for (k = 0; k < screen->w; k++) { 69 buffer32 = (Uint32 *) buffer;
57 *buffer16++ = color; 70 for (k = 0; k < screen->w; k++) {
58 } 71 *buffer32++ = color;
59 buffer += screen->pitch;
60 } 72 }
61 break; 73 buffer += screen->pitch;
62 case 4: 74 }
63 for (i = 0; i < screen->h; ++i) { 75 break;
64 Uint32 *buffer32;
65 Uint32 color;
66
67 gradient = ((i * 255) / screen->h);
68 color = SDL_MapRGB(screen->format,
69 gradient, gradient, gradient);
70 buffer32 = (Uint32 *) buffer;
71 for (k = 0; k < screen->w; k++) {
72 *buffer32++ = color;
73 }
74 buffer += screen->pitch;
75 }
76 break;
77 } 76 }
78 77
79 SDL_UnlockSurface(screen); 78 SDL_UnlockSurface(screen);
80 SDL_UpdateRect(screen, 0, 0, 0, 0); 79 SDL_UpdateRect(screen, 0, 0, 0, 0);
81 } 80 }
521 520
522 area.x = event.button.x - 16; 521 area.x = event.button.x - 16;
523 area.y = event.button.y - 16; 522 area.y = event.button.y - 16;
524 area.w = 32; 523 area.w = 32;
525 area.h = 32; 524 area.h = 32;
526 SDL_FillRect(screen, &area, SDL_MapRGB(screen->format, 0, 0, 0)); 525 SDL_FillRect(screen, &area,
526 SDL_MapRGB(screen->format, 0, 0, 0));
527 SDL_UpdateRects(screen, 1, &area); 527 SDL_UpdateRects(screen, 1, &area);
528 } 528 }
529 break; 529 break;
530 case SDL_KEYDOWN: 530 case SDL_KEYDOWN:
531 if (event.key.keysym.sym == SDLK_ESCAPE) { 531 if (event.key.keysym.sym == SDLK_ESCAPE) {