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Allow text drawing to use the alpha channel. (#5246)

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related to https://github.com/i3/i3/issues/3724

Tested using the following config with picom:

bar {
	i3bar_command i3bar -t
	status_command i3status
	colors {
		# fully	transparent text on opaque background:
		statusline #ffffff00
		background #000000ff
	}
}
This commit is contained in:
Michael Stapelberg
2022-11-06 12:43:37 +01:00
committed by GitHub
parent c8fd8eff21
commit 9e3a9e8225
4 changed files with 21 additions and 7 deletions
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16
libi3/get_colorpixel.c
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@ -30,17 +30,27 @@ SLIST_HEAD(colorpixel_head, Colorpixel) colorpixels;
*
*/
uint32_t get_colorpixel(const char *hex) {
char strgroups[3][3] = {
char alpha[2];
if (strlen(hex) == strlen("#rrggbbaa")) {
alpha[0] = hex[7];
alpha[1] = hex[8];
} else {
alpha[0] = alpha[1] = 'F';
}
char strgroups[4][3] = {
{hex[1], hex[2], '\0'},
{hex[3], hex[4], '\0'},
{hex[5], hex[6], '\0'}};
{hex[5], hex[6], '\0'},
{alpha[0], alpha[1], '\0'}};
uint8_t r = strtol(strgroups[0], NULL, 16);
uint8_t g = strtol(strgroups[1], NULL, 16);
uint8_t b = strtol(strgroups[2], NULL, 16);
uint8_t a = strtol(strgroups[3], NULL, 16);
/* Shortcut: if our screen is true color, no need to do a roundtrip to X11 */
if (root_screen == NULL || root_screen->root_depth == 24 || root_screen->root_depth == 32) {
return (0xFFUL << 24) | (r << 16 | g << 8 | b);
return (a << 24) | (r << 16 | g << 8 | b);
}
/* Lookup this colorpixel in the cache */