extern void x_make_frame_visible (struct frame *f);
extern void x_make_frame_invisible (struct frame *f);
extern void x_iconify_frame (struct frame *f);
-extern int x_char_width (struct frame *f);
-extern int x_char_height (struct frame *f);
extern int x_pixel_width (struct frame *f);
extern int x_pixel_height (struct frame *f);
extern void x_set_frame_alpha (struct frame *f);