set_clip_state - Turns on or off the clipping of a bitmap. Allegro game programming library.

       Turns  on  (if  state  is  non-zero) or off (if state is zero) clipping for the specified bitmap. Turning
       clipping off may slightly speed up some drawing operations (usually a  negligible   difference,  although
       every  little helps) but will result in your program dying a horrible death if you try to draw beyond the
       edges of the bitmap.

       set_clip_state - Turns on or off the clipping of a bitmap. Allegro game programming library.

set_clip_rect(3alleg4), get_clip_rect(3alleg4), add_clip_rect(3alleg4), get_clip_state(3alleg4)

Allegro                                           version 4.4.3                          set_clip_state(3alleg4)

#include<allegro.h>voidset_clip_state(BITMAP*bitmap,intstate)