+extern Lisp_Object help_echo_string, help_echo_window;
+extern Lisp_Object help_echo_object, previous_help_echo_string;
+extern int help_echo_pos;
+extern struct frame *last_mouse_frame;
+extern int last_tool_bar_item;
+extern int mouse_autoselect_window;
+extern void reseat_at_previous_visible_line_start P_ ((struct it *));
+
+extern int calc_pixel_width_or_height P_ ((double *, struct it *, Lisp_Object,
+ /* XFontStruct */ void *, int, int *));
+
+#ifdef HAVE_WINDOW_SYSTEM
+
+#if GLYPH_DEBUG
+extern void dump_glyph_string P_ ((struct glyph_string *));
+#endif
+
+extern void x_get_glyph_overhangs P_ ((struct glyph *, struct frame *,
+ int *, int *));
+extern void x_produce_glyphs P_ ((struct it *));
+
+extern void x_write_glyphs P_ ((struct glyph *, int));
+extern void x_insert_glyphs P_ ((struct glyph *, int len));
+extern void x_clear_end_of_line P_ ((int));
+
+extern int x_stretch_cursor_p;
+extern struct cursor_pos output_cursor;
+
+extern void x_fix_overlapping_area P_ ((struct window *, struct glyph_row *,
+ enum glyph_row_area));
+extern void draw_phys_cursor_glyph P_ ((struct window *,
+ struct glyph_row *,
+ enum draw_glyphs_face));
+extern int get_phys_cursor_geometry P_ ((struct window *, struct glyph_row *,
+ struct glyph *, int *));
+extern void erase_phys_cursor P_ ((struct window *));
+extern void display_and_set_cursor P_ ((struct window *,
+ int, int, int, int, int));
+
+extern void set_output_cursor P_ ((struct cursor_pos *));
+extern void x_cursor_to P_ ((int, int, int, int));
+
+extern void x_update_cursor P_ ((struct frame *, int));
+extern void x_clear_cursor P_ ((struct window *));
+extern void x_draw_vertical_border P_ ((struct window *w));
+
+extern void frame_to_window_pixel_xy P_ ((struct window *, int *, int *));
+extern void get_glyph_string_clip_rect P_ ((struct glyph_string *,
+ NativeRectangle *nr));
+extern Lisp_Object find_hot_spot P_ ((Lisp_Object, int, int));
+extern void note_mouse_highlight P_ ((struct frame *, int, int));
+extern void x_clear_window_mouse_face P_ ((struct window *));
+extern void cancel_mouse_face P_ ((struct frame *));
+
+extern void handle_tool_bar_click P_ ((struct frame *,
+ int, int, int, unsigned int));
+
+/* msdos.c defines its own versions of these functions. */
+extern int clear_mouse_face P_ ((Display_Info *));
+extern void show_mouse_face P_ ((Display_Info *, enum draw_glyphs_face));
+extern int cursor_in_mouse_face_p P_ ((struct window *w));
+
+extern void expose_frame P_ ((struct frame *, int, int, int, int));
+extern int x_intersect_rectangles P_ ((XRectangle *, XRectangle *,
+ XRectangle *));
+#endif
+
+/* Defined in fringe.c */
+
+int lookup_fringe_bitmap (Lisp_Object);
+void draw_fringe_bitmap P_ ((struct window *, struct glyph_row *, int));
+void draw_row_fringe_bitmaps P_ ((struct window *, struct glyph_row *));
+int draw_window_fringes P_ ((struct window *, int));
+int update_window_fringes P_ ((struct window *, int));
+void compute_fringe_widths P_ ((struct frame *, int));
+
+#ifdef WINDOWS_NT
+void w32_init_fringe P_ ((void));
+void w32_reset_fringes P_ ((void));
+#endif
+
+/* Defined in image.c */
+
+#ifdef HAVE_WINDOW_SYSTEM
+
+extern int x_bitmap_height P_ ((struct frame *, int));
+extern int x_bitmap_width P_ ((struct frame *, int));
+extern int x_bitmap_pixmap P_ ((struct frame *, int));
+extern void x_reference_bitmap P_ ((struct frame *, int));
+extern int x_create_bitmap_from_data P_ ((struct frame *, char *,
+ unsigned int, unsigned int));
+extern int x_create_bitmap_from_file P_ ((struct frame *, Lisp_Object));
+#ifndef x_destroy_bitmap
+extern void x_destroy_bitmap P_ ((struct frame *, int));
+#endif
+extern void x_destroy_all_bitmaps P_ ((Display_Info *));
+extern int x_create_bitmap_mask P_ ((struct frame * , int));
+extern Lisp_Object x_find_image_file P_ ((Lisp_Object));
+
+void x_kill_gs_process P_ ((Pixmap, struct frame *));
+struct image_cache *make_image_cache P_ ((void));
+void free_image_cache P_ ((struct frame *));
+void clear_image_cache P_ ((struct frame *, int));
+void forall_images_in_image_cache P_ ((struct frame *,
+ void (*) P_ ((struct image *))));
+int valid_image_p P_ ((Lisp_Object));
+void prepare_image_for_display P_ ((struct frame *, struct image *));
+int lookup_image P_ ((struct frame *, Lisp_Object));
+
+unsigned long image_background P_ ((struct image *, struct frame *,
+ XImagePtr_or_DC ximg));
+int image_background_transparent P_ ((struct image *, struct frame *,
+ XImagePtr_or_DC mask));
+
+int image_ascent P_ ((struct image *, struct face *, struct glyph_slice *));
+
+#endif