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screen: Fix alpha handling, cdkong looks good now [O. Galibert]

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This commit is contained in:
Olivier Galibert 2016-04-14 14:55:10 +02:00
parent e138da8886
commit f9fabb1f37
1 changed files with 9 additions and 0 deletions
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9
src/emu/screen.cpp
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@ -99,12 +99,21 @@ int screen_device_svg_renderer::render(screen_device &screen, bitmap_rgb32 &bitm
// Annoyingly, nanosvg doesn't use the same byte order than our bitmaps
// It generates non-premultiplied alpha anyway, so remultiply by
// alpha to "blend" against a black background.
for(unsigned int y=0; y<bitmap.height(); y++) {
UINT8 *image = (UINT8 *)bitmap.raw_pixptr(y, 0);
for(unsigned int x=0; x<bitmap.width(); x++) {
UINT8 r = image[0];
UINT8 g = image[1];
UINT8 b = image[2];
UINT8 a = image[3];
if(a != 0xff) {
r = r*a/255;
g = g*a/255;
b = b*a/255;
}
UINT32 color = 0xff000000 | (r << 16) | (g << 8) | (b << 0);
*(UINT32 *)image = color;
image += 4;