+/* Sets (and possibly dims) background from frontend default colour,
+ * and auto-generates highlight and lowlight colours too. */
+void game_mkhighlight(frontend *fe, float *ret,
+ int background, int highlight, int lowlight);
+
+/* Randomly shuffles an array of items. */
+void shuffle(void *array, int nelts, int eltsize, random_state *rs);
+
+/* Draw a rectangle outline, using the frontend's draw_line. */
+void draw_rect_outline(frontend *fe, int x, int y, int w, int h,
+ int colour);