Allegro 5 api
#include <allegro5/allegro.h> void al_set_new_bitmap_format(int format)
Sets the pixel format for newly created bitmaps. The default format is 0 and means the display driver will choose the best format.
ALLEGRO_PIXEL_FORMAT(3alleg5), al_get_new_bitmap_format(3alleg5), al_get_bitmap_format(3alleg5)