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wayland: auto-contrast menu text color for dark themes 

When MenuTextColor is not explicitly set (defaults to black), dark
widget themes render invisible black-on-dark menu text. Compute
luminance contrast between text color and background; if insufficient
(< 64 difference), substitute white text on dark backgrounds or black
text on light backgrounds.
This commit is contained in:
lkn 2026-06-25 07:52:58 +02:00
parent 72d6e31f24
commit 06dd22254d
1 changed files with 14 additions and 0 deletions
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14
src/backend/wayland/wl_window.c
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@ -468,6 +468,20 @@ void wl_menu_paint_entry(WMenu *menu, int index, int selected)
/* Draw text using WINGs font backend (renders via PangoFT2 → pixman) */
WMColor *color = selected ? scr->select_text_color :
(entry->flags.enabled ? scr->mtext_color : scr->dtext_color);
/* Ensure text is readable against background: if text color is too
* close to bg (dark theme with black text), use white instead. */
if (color && !selected) {
unsigned tr = WMRedComponentOfColor(color) >> 8;
unsigned tg = WMGreenComponentOfColor(color) >> 8;
unsigned tb = WMBlueComponentOfColor(color) >> 8;
unsigned br = (bg >> 16) & 0xFF;
unsigned bg_ = (bg >> 8) & 0xFF;
unsigned bb = bg & 0xFF;
int text_lum = (int)(tr * 299 + tg * 587 + tb * 114) / 1000;
int bg_lum = (int)(br * 299 + bg_ * 587 + bb * 114) / 1000;
if (abs(text_lum - bg_lum) < 64)
color = (bg_lum < 128) ? scr->white : scr->black;
}
WMFont *font = scr->menu_entry_font;
WMDrawable d = (WMDrawable)(uintptr_t)fb->image;