al_add_new_bitmap_flag(3) al_add_new_bitmap_flag(3)

al_add_new_bitmap_flag - Allegro 5 API

#include <allegro5/allegro.h>
void al_add_new_bitmap_flag(int flag)

A convenience function which does the same as
al_set_new_bitmap_flags(al_get_new_bitmap_flags() | flag);

al_set_new_bitmap_flags(3), al_get_new_bitmap_flags(3), al_get_bitmap_flags(3)
Allegro reference manual