get_clip_state  -  Tells  if  clipping is on for a bitmap. Allegro game
       programming library.
       #include <allegro.h>
       int get_clip_state(BITMAP *bitmap)
       Returns non-zero if clipping is turned on for the specified bitmap  and
       zero otherwise.
       set_clip_rect(3alleg),   get_clip_rect(3alleg),  add_clip_rect(3alleg),
       set_clip_state(3alleg)