grr_icon_predraw (grr_icon_t *icon, cairo_t *xrs, int width, int height);
void
-grr_icon_draw_predrawn (grr_icon_t *icon, cairo_t *xrs);
+grr_icon_draw_predrawn (grr_icon_t *icon, cairo_t *xrs, double alpha);
char *
grr_icon_robot_name (rr_robot_t robot);