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show a checker background behind images with transparency

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This commit is contained in:
Andre Leiradella 2016-05-29 00:24:09 -03:00
parent d39d925c1d
commit 97a4f0d2fd
1 changed files with 24 additions and 6 deletions
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30
cores/libretro-imageviewer/image_core.c
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@ -395,13 +395,31 @@ void IMAGE_CORE_PREFIX(retro_run)(void)
struct retro_system_av_info info;
uint32_t *buf = &image_buffer[0];
uint32_t *end = buf + (image_width*image_height*sizeof(uint32_t))/4;
while(buf < end)
int x, y;
for (y = 0; y < image_height; y++)
{
uint32_t pixel = *buf;
*buf = (pixel & 0xff00ff00) | ((pixel << 16) & 0x00ff0000) | ((pixel >> 16) & 0xff);
buf++;
for (x = 0; x < image_width; x++, buf++)
{
uint32_t pixel = *buf;
uint32_t a = pixel >> 24;
if (a == 255)
*buf = (pixel & 0x0000ff00) | ((pixel << 16) & 0x00ff0000) | ((pixel >> 16) & 0x000000ff);
else
{
uint32_t r = pixel & 0x0000ff;
uint32_t g = (pixel & 0x00ff00) >> 8;
uint32_t b = (pixel & 0xff0000) >> 16;
uint32_t bg = ((x & 8) ^ (y & 8)) ? 0x66 : 0x99;
r = a * r / 255 + (255 - a) * bg / 255;
g = a * g / 255 + (255 - a) * bg / 255;
b = a * b / 255 + (255 - a) * bg / 255;
*buf = r << 16 | g << 8 | b;
}
}
}
IMAGE_CORE_PREFIX(retro_get_system_av_info)(&info);