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Just for Gareth: a means of overriding individual game colour
settings using environment variables. GTK frontend only, because
this is an unsupported (and unprincipled) hack.

[originally from svn r5792]

--- a/gtk.c

+++ b/gtk.c

@@ -1131,9 +1131,24 @@

         fe->ncolours = ncolours;

         fe->colours = snewn(ncolours, GdkColor);

         for (i = 0; i < ncolours; i++) {

-            fe->colours[i].red = colours[i*3] * 0xFFFF;

-            fe->colours[i].green = colours[i*3+1] * 0xFFFF;

-            fe->colours[i].blue = colours[i*3+2] * 0xFFFF;

+            /*

+             * Just for Gareth: if you dislike any of the standard

+             * colours, here's your chance to configure them in a

+             * really hacky way. 

+             */

+            char buf[80], *e;

+            unsigned int r, g, b;

+            sprintf(buf, "PUZZLE_COLOUR_%d", i);

+            if ((e = getenv(buf)) != NULL &&

+                sscanf(e, "%2x%2x%2x", &r, &g, &b) == 3) {

+                fe->colours[i].red = r * 0x101;

+                fe->colours[i].green = g * 0x101;

+                fe->colours[i].blue = b * 0x101;

+            } else {

+                fe->colours[i].red = colours[i*3] * 0xFFFF;

+                fe->colours[i].green = colours[i*3+1] * 0xFFFF;

+                fe->colours[i].blue = colours[i*3+2] * 0xFFFF;

+            }

         }

         success = snewn(ncolours, gboolean);

         gdk_colormap_alloc_colors(fe->colmap, fe->colours, ncolours,