DOKK / manpages / debian 10 / allegro5-doc / al_is_sub_bitmap.3alleg5.en
al_is_sub_bitmap(3alleg5) al_is_sub_bitmap(3alleg5)

al_is_sub_bitmap - Allegro 5 API

#include <allegro5/allegro.h>
bool al_is_sub_bitmap(ALLEGRO_BITMAP *bitmap)
    

Returns true if the specified bitmap is a sub-bitmap, false otherwise.

al_create_sub_bitmap(3alleg5), al_get_parent_bitmap(3alleg5)

Allegro reference manual