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wl_backend: add X11 rgb.txt color name lookup 

The named color table only had basic colors (black, white, red, etc.)
but Window Maker backgrounds use extended X11 color names like
deepskyblue4, tomato4, blue4. Now falls back to parsing
/usr/share/X11/rgb.txt for any unrecognized color name.

Fixes Sunset and other multi-color gradient backgrounds that use
X11 named colors.
This commit is contained in:
Window Maker 2026-05-24 14:38:14 +02:00
parent a62a05bbb7
commit 07022840ac
1 changed files with 36 additions and 0 deletions
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36
src/backend/wayland/wl_backend.c
View File

@ -8767,6 +8767,42 @@ static int wl_get_color_for_colormap(unsigned long colormap,
}
}
/* Look up in X11 rgb.txt database */
{
static const char *rgb_paths[] = {
"/usr/share/X11/rgb.txt",
"/usr/lib/X11/rgb.txt",
"/etc/X11/rgb.txt",
NULL
};
FILE *f = NULL;
for (int i = 0; rgb_paths[i] && !f; i++)
f = fopen(rgb_paths[i], "r");
if (f) {
char line[256];
while (fgets(line, sizeof(line), f)) {
unsigned int rv, gv, bv;
char name[128];
if (line[0] == '!' || line[0] == '#')
continue;
if (sscanf(line, "%u %u %u %127[^\n]", &rv, &gv, &bv, name) == 4) {
/* Trim leading whitespace/tabs from name */
char *n = name;
while (*n == ' ' || *n == '\t') n++;
if (strcasecmp(n, color_name) == 0) {
color->red = rv << 8 | rv;
color->green = gv << 8 | gv;
color->blue = bv << 8 | bv;
color->pixel = (0xFF << 24) | (rv << 16) | (gv << 8) | bv;
fclose(f);
return 1;
}
}
}
fclose(f);
}
}
wwarning(_("could not parse color \"%s\" (Wayland)"), color_name);
return 0;
}