suse man page for set_clip_state

set_clip_state(3alleg4)                                           Allegro manual                                           set_clip_state(3alleg4)

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

SYNOPSIS
       #include <allegro.h>

       void set_clip_state(BITMAP *bitmap, int state)

DESCRIPTION
       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.

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

Allegro                                                            version 4.4.2                                           set_clip_state(3alleg4)