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comparison test/testwin.c @ 2821:c4eccbd21d16

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You can't use memset() on screen formats with an alpha channel
author Sam Lantinga <slouken@libsdl.org>
date Tue, 02 Dec 2008 16:09:58 +0000
parents c121d94672cb
children
comparison
equal deleted inserted replaced
2820:33ddad305f3d 2821:c4eccbd21d16
71 if (!SDL_SetColors(screen, colors, 0, ncolors) && 71 if (!SDL_SetColors(screen, colors, 0, ncolors) &&
72 (screen->format->palette != NULL)) { 72 (screen->format->palette != NULL)) {
73 fprintf(stderr, 73 fprintf(stderr,
74 "Warning: Couldn't set all of the colors, but SDL will map the image\n" 74 "Warning: Couldn't set all of the colors, but SDL will map the image\n"
75 " (colormap fading will suffer - try the -warp option)\n"); 75 " (colormap fading will suffer - try the -warp option)\n");
76 }
77
78 /* Set the screen to black (not really necessary) */
79 if (SDL_LockSurface(screen) == 0) {
80 Uint32 black;
81 Uint8 *pixels;
82
83 black = SDL_MapRGB(screen->format, 0, 0, 0);
84 pixels = (Uint8 *) screen->pixels;
85 for (i = 0; i < screen->h; ++i) {
86 memset(pixels, black, screen->w * screen->format->BytesPerPixel);
87 pixels += screen->pitch;
88 }
89 SDL_UnlockSurface(screen);
90 SDL_UpdateRect(screen, 0, 0, 0, 0);
91 } 76 }
92 77
93 /* Display the picture */ 78 /* Display the picture */
94 if (speedy) { 79 if (speedy) {
95 SDL_Surface *displayfmt; 80 SDL_Surface *displayfmt;