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Fixed testalpha screen clear for screen formats with an alpha channel

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--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%403267
This commit is contained in:
Sam Lantinga 2008-11-29 11:24:18 +00:00
parent b64cf8229c
commit 7a4a712978
1 changed files with 35 additions and 35 deletions
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70
test/testalpha.c
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@ -36,44 +36,43 @@ FillBackground(SDL_Surface * screen)
}
buffer = (Uint8 *) screen->pixels;
switch (screen->format->BytesPerPixel) {
case 1:
case 3:
for (i = 0; i < screen->h; ++i) {
memset(buffer, (i * 255) / screen->h,
screen->w * screen->format->BytesPerPixel);
buffer += screen->pitch;
}
break;
case 2:
for (i = 0; i < screen->h; ++i) {
Uint16 *buffer16;
Uint16 color;
case 1:
case 3:
for (i = 0; i < screen->h; ++i) {
memset(buffer, (i * 255) / screen->h,
screen->w * screen->format->BytesPerPixel);
buffer += screen->pitch;
}
break;
case 2:
for (i = 0; i < screen->h; ++i) {
Uint16 *buffer16;
Uint16 color;
gradient = ((i * 255) / screen->h);
color = (Uint16) SDL_MapRGB(screen->format,
gradient, gradient, gradient);
buffer16 = (Uint16 *) buffer;
for (k = 0; k < screen->w; k++) {
*buffer16++ = color;
}
buffer += screen->pitch;
gradient = ((i * 255) / screen->h);
color = (Uint16) SDL_MapRGB(screen->format,
gradient, gradient, gradient);
buffer16 = (Uint16 *) buffer;
for (k = 0; k < screen->w; k++) {
*buffer16++ = color;
}
break;
case 4:
for (i = 0; i < screen->h; ++i) {
Uint32 *buffer32;
Uint32 color;
buffer += screen->pitch;
}
break;
case 4:
for (i = 0; i < screen->h; ++i) {
Uint32 *buffer32;
Uint32 color;
gradient = ((i * 255) / screen->h);
color = SDL_MapRGB(screen->format,
gradient, gradient, gradient);
buffer32 = (Uint32 *) buffer;
for (k = 0; k < screen->w; k++) {
*buffer32++ = color;
}
buffer += screen->pitch;
gradient = ((i * 255) / screen->h);
color = SDL_MapRGB(screen->format, gradient, gradient, gradient);
buffer32 = (Uint32 *) buffer;
for (k = 0; k < screen->w; k++) {
*buffer32++ = color;
}
break;
buffer += screen->pitch;
}
break;
}
SDL_UnlockSurface(screen);
@ -523,7 +522,8 @@ main(int argc, char *argv[])
area.y = event.button.y - 16;
area.w = 32;
area.h = 32;
SDL_FillRect(screen, &area, SDL_MapRGB(screen->format, 0, 0, 0));
SDL_FillRect(screen, &area,
SDL_MapRGB(screen->format, 0, 0, 0));
SDL_UpdateRects(screen, 1, &area);
}
break;