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Feed Xorg colors with the alpha channel premultiplied in

This commit is contained in:
LemonBoy 2014-05-07 20:53:10 +02:00
parent a447500477
commit 26044f210b
1 changed files with 14 additions and 3 deletions
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17
bar.c
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@ -156,9 +156,20 @@ parse_color (const char *str, char **end, const uint32_t def)
if (str[0] == '#') {
errno = 0;
uint32_t tmp = strtoul(str + 1, end, 16);
/* Some error checking it's good */
/* Some error checking is definitely good */
if (errno)
return def;
tmp = def;
/* Xorg uses colors with premultiplied alpha.
* Don't bother if we didn't acquire a rgba visual. */
if (visual != scr->root_visual) {
const uint8_t a = ((tmp>>24)&255);
if (a < 255) {
/* Handle overflow by truncating the result, should be ok */
const uint32_t t1 = (tmp&0xff00ff) * (0x100-a);
const uint32_t t2 = (tmp&0x00ff00) * (0x100-a);
tmp = (a<<24)|(t1&0xff00ff)|(t2&0x00ff00);
}
}
return tmp;
}
@ -302,7 +313,7 @@ parse (char *text)
memset(&astack, 0, sizeof(area_stack_t));
fill_rect(cur_mon->pixmap, gc[GC_CLEAR], 0, 0, bw, bh);
fill_rect(cur_mon->pixmap, gc[GC_CLEAR], 0, 0, cur_mon->width, bh);
for (;;) {
if (*p == '\0' || *p == '\n')