+
+ /* Don't let the grid be smaller than 3x3 */
+ if (grid_size > xgwa.width / 3)
+ grid_size = xgwa.width / 3;
+ if (grid_size > xgwa.height / 3)
+ grid_size = xgwa.height / 3;
+
+ {
+ XColor fgc, bgc;
+ char *fgs = get_string_resource("background", "Background");
+ char *bgs = get_string_resource("foreground", "Foreground");
+ Bool fg_ok, bg_ok;
+ if (!XParseColor (dpy, cmap, fgs, &fgc))
+ XParseColor (dpy, cmap, "black", &bgc);
+ if (!XParseColor (dpy, cmap, bgs, &bgc))
+ XParseColor (dpy, cmap, "gray", &fgc);
+
+ fg_ok = XAllocColor (dpy, cmap, &fgc);
+ bg_ok = XAllocColor (dpy, cmap, &bgc);
+
+ /* If we weren't able to allocate the two colors we want from the
+ colormap (which is likely if the screen has been grabbed on an
+ 8-bit SGI visual -- don't ask) then just go through the map
+ and find the closest color to the ones we wanted, and use those
+ pixels without actually allocating them.
+ */
+ if (fg_ok)
+ fg = fgc.pixel;
+ else
+ fg = 0;
+
+ if (bg_ok)
+ bg = bgc.pixel;
+ else
+ bg = 1;
+
+ if (!fg_ok || bg_ok)
+ {
+ unsigned long fgd = ~0;
+ unsigned long bgd = ~0;
+ int max = visual_cells (xgwa.screen, visual);
+ XColor *all = (XColor *) calloc(sizeof (*all), max);
+ for (i = 0; i < max; i++)
+ {
+ all[i].flags = DoRed|DoGreen|DoBlue;
+ all[i].pixel = i;
+ }
+ XQueryColors (dpy, cmap, all, max);
+ for(i = 0; i < max; i++)
+ {
+ long rd, gd, bd;
+ unsigned long d;
+ if (!fg_ok)
+ {
+ rd = (all[i].red >> 8) - (fgc.red >> 8);
+ gd = (all[i].green >> 8) - (fgc.green >> 8);
+ bd = (all[i].blue >> 8) - (fgc.blue >> 8);
+ if (rd < 0) rd = -rd;
+ if (gd < 0) gd = -gd;
+ if (bd < 0) bd = -bd;
+ d = (rd << 1) + (gd << 2) + bd;
+ if (d < fgd)
+ {
+ fgd = d;
+ fg = all[i].pixel;
+ if (d == 0)
+ fg_ok = True;
+ }
+ }
+
+ if (!bg_ok)
+ {
+ rd = (all[i].red >> 8) - (bgc.red >> 8);
+ gd = (all[i].green >> 8) - (bgc.green >> 8);
+ bd = (all[i].blue >> 8) - (bgc.blue >> 8);
+ if (rd < 0) rd = -rd;
+ if (gd < 0) gd = -gd;
+ if (bd < 0) bd = -bd;
+ d = (rd << 1) + (gd << 2) + bd;
+ if (d < bgd)
+ {
+ bgd = d;
+ bg = all[i].pixel;
+ if (d == 0)
+ bg_ok = True;
+ }
+ }
+
+ if (fg_ok && bg_ok)
+ break;
+ }
+ XFree(all);
+ }
+ }
+