+/*
+ * Redraw goal tiles immediately. The mask specifies which tiles will
+ * be redrawn, in the same bit arrangement as the board goal bitmaps.
+ * Tiles corresponding to set bits in mask are redrawn, and tiles
+ * corresponding to clear bits are not redrawn.
+ *
+ * Additionally, if icon_shell is non-null (with the caller passing the
+ * application shell widget), the program's icon pixmap is updated to
+ * match the current goal.
+ */
+void x11_redraw_goal(struct app_state *state, uint_fast32_t mask,
+ Widget icon_shell);
+
+/*
+ * Mark tiles for redraw. The redraw is not performed immediately, but
+ * rather a background task is installed to perform the redraw at a later
+ * time.
+ *
+ * The mode parameter may be one of the following enumerated values:
+ *
+ * * RENDER_MODE_GAME: mark game tiles for update.
+ * * RENDER_MODE_GOAL: mark goal tiles for update.
+ * * RENDER_MODE_BOTH: mark both game and goal tiles for update (probably
+ * only useful if mask has all bits set).
+ */
+void x11_queue_render(struct app_state *state, uint_fast32_t mask, int mode);
+
+enum {
+ RENDER_MODE_GOAL = 1,
+ RENDER_MODE_GAME = 2,
+ RENDER_MODE_BOTH = 3
+};
+