al_add_new_bitmap_flag - Allegro 5 API

       A convenience function which does the same as

              al_set_new_bitmap_flags(al_get_new_bitmap_flags() | flag);

       al_add_new_bitmap_flag - Allegro 5 API

al_set_new_bitmap_flags(3alleg5), al_get_new_bitmap_flags(3alleg5), al_get_bitmap_flags(3alleg5)

Allegro reference manual                                                         al_add_new_bitmap_flag(3alleg5)

              #include <allegro5/allegro.h>

              void al_add_new_bitmap_flag(int flag)