al_get_new_bitmap_depth - Allegro 5 API

       Returns  the value currently set with al_set_new_bitmap_depth(3alleg5) on the current thread or 0 if none
       was set.

       al_get_new_bitmap_depth - Allegro 5 API

       5.2.1

              [UnstableAPI]: This is an experimental feature and currently only works for the OpenGL backend.

Allegro reference manual                                                        al_get_new_bitmap_depth(3alleg5)

              #include <allegro5/allegro.h>

              int al_get_new_bitmap_depth(void)
              GETTER(new_bitmap_depth, 0)