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Use pre-multiplied colors by default

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wlr_scene_rects expect their color to be pre-multiplied
while cairo_set_source_rgba() expects them to not be
pre-multiplied. With this patch we now use premultiplied
colors internally by default and then reverse it when
setting cairo colors.

This ensures the titlebar uses a consistent color in case
it was defined with some transparency by the user.

Fixes: #1684
This commit is contained in:
Consolatis 2024-04-06 17:46:30 +02:00
parent 33859138cf
commit c35ba02ffa
3 changed files with 20 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

14
src/common/graphic-helpers.c
View file

@ -85,7 +85,19 @@ draw_cairo_border(cairo_t *cairo, struct wlr_fbox fbox, double line_width)
void
set_cairo_color(cairo_t *cairo, const float *c)
{
cairo_set_source_rgba(cairo, c[0], c[1], c[2], c[3]);
/*
* We are dealing with pre-multiplied colors
* but cairo expects unmultiplied colors here
*/
float alpha = c[3];
if (alpha == 0.0f) {
cairo_set_source_rgba(cairo, 0, 0, 0, 0);
return;
}
cairo_set_source_rgba(cairo, c[0] / alpha, c[1] / alpha,
c[2] / alpha, alpha);
}
struct surface_context

2
src/overlay.c
View file

@ -16,7 +16,7 @@ create_overlay(struct seat *seat)
seat->overlay.tree = parent;
wlr_scene_node_set_enabled(&parent->node, false);
if (!wlr_renderer_is_pixman(server->renderer)) {
/* Hardware assisted rendering: Half transparent overlay */
/* Hardware assisted rendering: Half transparent overlay, pre-multiplied */
float color[4] = { 0.25, 0.25, 0.35, 0.5 };
seat->overlay.rect = wlr_scene_rect_create(parent, 0, 0, color);
} else {

8
src/theme.c
View file

@ -135,8 +135,8 @@ create_hover_fallback(struct theme *theme, const char *icon_name,
(width - icon_width) / 2, (height - icon_height) / 2);
cairo_paint(cairo);
/* Overlay (non-multiplied alpha) */
float overlay_color[4] = { 0.5f, 0.5f, 0.5f, 0.3f};
/* Overlay (pre-multiplied alpha) */
float overlay_color[4] = { 0.15f, 0.15f, 0.15f, 0.3f};
enum corner corner = corner_from_icon_name(icon_name);
if (corner == LAB_CORNER_UNKNOWN) {
@ -406,6 +406,10 @@ parse_hexstr(const char *hex, float *rgba)
rgba[2] = (hex_to_dec(hex[5]) * 16 + hex_to_dec(hex[6])) / 255.0;
if (strlen(hex) > 7) {
rgba[3] = atoi(hex + 7) / 100.0;
/* Pre-multiply everything as expected by wlr_scene */
rgba[0] *= rgba[3];
rgba[1] *= rgba[3];
rgba[2] *= rgba[3];
} else {
rgba[3] = 1.0;
}