+void redisplay_output_subwindow (struct window *w, struct display_line *dl,
+ Lisp_Object image_instance, int xpos,
+ int xoffset, int start_pixpos, int width,
+ face_index findex, int cursor_start,
+ int cursor_width, int cursor_height);
+void redisplay_unmap_subwindows_maybe (struct frame* f, int x, int y, int width, int height);
+void redisplay_clear_region (Lisp_Object window, face_index findex, int x,
+ int y, int width, int height);