al_is_sub_bitmap - Allegro 5 API

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

       al_is_sub_bitmap - Allegro 5 API

al_create_sub_bitmap(3alleg5), al_get_parent_bitmap(3alleg5)

Allegro reference manual                                                               al_is_sub_bitmap(3alleg5)

              #include <allegro5/allegro.h>

              bool al_is_sub_bitmap(ALLEGRO_BITMAP *bitmap)