pandory500/SDL-mirror
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Updated blend semantics so blending uses the following formula:

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dstRGB = (srcRGB * srcA) + (dstRGB * (1-srcA))
    dstA = srcA + (dstA * (1-srcA))
This allows proper compositing semantics without requiring premultiplied alpha.

Needs full unit test coverage and bug fixes!
This commit is contained in:
Sam Lantinga 2013-07-23 08:06:49 -07:00
parent a99edf3519
commit 32188834b5
17 changed files with 362 additions and 1001 deletions
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10
test/testsprite2.c
View file

@ -56,7 +56,7 @@ quit(int rc)
}
int
LoadSprite(char *file)
LoadSprite(const char *file)
{
int i;
SDL_Surface *temp;
@ -243,6 +243,7 @@ main(int argc, char *argv[])
SDL_Event event;
Uint32 then, now, frames;
Uint64 seed;
const char *icon = "icon.bmp";
/* Initialize parameters */
num_sprites = NUM_SPRITES;
@ -292,11 +293,14 @@ main(int argc, char *argv[])
} else if (SDL_isdigit(*argv[i])) {
num_sprites = SDL_atoi(argv[i]);
consumed = 1;
} else if (argv[i][0] != '-') {
icon = argv[i];
consumed = 1;
}
}
if (consumed < 0) {
fprintf(stderr,
"Usage: %s %s [--blend none|blend|add|mod] [--cyclecolor] [--cyclealpha] [--iterations N]\n",
"Usage: %s %s [--blend none|blend|add|mod] [--cyclecolor] [--cyclealpha] [--iterations N] [num_sprites] [icon.bmp]\n",
argv[0], SDLTest_CommonUsage(state));
quit(1);
}
@ -318,7 +322,7 @@ main(int argc, char *argv[])
SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
SDL_RenderClear(renderer);
}
if (LoadSprite("icon.bmp") < 0) {
if (LoadSprite(icon) < 0) {
quit(2);
}