man is_system_bitmap (3): Tells if a bitmap is a system bitmap or sub bitmap. Allegro game programming library.

is_system_bitmap(3) Tells if a bitmap is a system bitmap or sub bitmap. Allegro game programming library.

SYNOPSIS

#include <allegro.h>

int is_system_bitmap(BITMAP *bmp);

Returns TRUE if bmp is a system bitmap object, or a sub-bitmap of one.