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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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4
libi3/font.c
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@ -21,6 +21,7 @@ static xcb_visualtype_t *root_visual_type;
static double pango_font_red;
static double pango_font_green;
static double pango_font_blue;
static double pango_font_alpha;
static PangoLayout *create_layout_with_dpi(cairo_t *cr) {
PangoLayout *layout;
@ -102,7 +103,7 @@ static void draw_text_pango(const char *text, size_t text_len,
/* Do the drawing */
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_set_source_rgb(cr, pango_font_red, pango_font_green, pango_font_blue);
cairo_set_source_rgba(cr, pango_font_red, pango_font_green, pango_font_blue, pango_font_alpha);
pango_cairo_update_layout(cr, layout);
pango_layout_get_pixel_size(layout, NULL, &height);
/* Center the piece of text vertically. */
@ -303,6 +304,7 @@ void set_font_colors(xcb_gcontext_t gc, color_t foreground, color_t background)
pango_font_red = foreground.red;
pango_font_green = foreground.green;
pango_font_blue = foreground.blue;
pango_font_alpha = foreground.alpha;
break;
}
}