+static void gradient_parentrelative(RrAppearance *a, gint w, gint h)
+{
+ RrPixel32 *source, *dest;
+ gint sw, sh, partial_w, partial_h, i;
+
+ g_assert (a->surface.parent);
+ g_assert (a->surface.parent->w);
+
+ sw = a->surface.parent->w;
+ sh = a->surface.parent->h;
+
+ source = (a->surface.parent->surface.pixel_data +
+ a->surface.parentx + sw * a->surface.parenty);
+ dest = a->surface.pixel_data;
+
+ if (a->surface.parentx + w > sw) {
+ partial_w = sw - a->surface.parentx;
+ } else partial_w = w;
+
+ if (a->surface.parenty + h > sh) {
+ partial_h = sh - a->surface.parenty;
+ } else partial_h = h;
+
+ for (i = 0; i < partial_h; i++, source += sw, dest += w) {
+ memcpy(dest, source, partial_w * sizeof(RrPixel32));
+ }
+}
+