pandory500/SDL-mirror
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Again, map the color with the alpha channel filled in.

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--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%403260
This commit is contained in:
Sam Lantinga 2008-11-28 20:09:32 +00:00
parent 3446f888c5
commit 79a929ff00
1 changed files with 38 additions and 19 deletions
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57
test/testalpha.c
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@ -25,8 +25,6 @@ static void
FillBackground(SDL_Surface * screen)
{
Uint8 *buffer;
Uint16 *buffer16;
Uint16 color;
Uint8 gradient;
int i, k;
@ -37,24 +35,45 @@ FillBackground(SDL_Surface * screen)
quit(2);
}
buffer = (Uint8 *) screen->pixels;
if (screen->format->BytesPerPixel != 2) {
for (i = 0; i < screen->h; ++i) {
memset(buffer, (i * 255) / screen->h,
screen->w * screen->format->BytesPerPixel);
buffer += screen->pitch;
}
} else {
for (i = 0; i < screen->h; ++i) {
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 + k) = color;
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;
}
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;
}
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;
}
break;
}
SDL_UnlockSurface(screen);