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)