al_load_bitmap - Allegro 5 API

       Loads   an   image   file   into   a  new  ALLEGRO_BITMAP(3alleg5).   The  file  type  is  determined  by
       al_identify_bitmap(3alleg5), using the extension as a fallback in case identification is not possible.

       Returns NULL on error.

       This is the same as calling al_load_bitmap_flags(3alleg5) with a flags parameter of 0.

              Note: the core Allegro library does not support any image file formats by default.  You  must  use
              the allegro_image addon, or register your own format handler.

       al_load_bitmap - Allegro 5 API

al_load_bitmap_flags(3alleg5),       al_load_bitmap_f(3alleg5),       al_register_bitmap_loader(3alleg5),
       al_set_new_bitmap_format(3alleg5), al_set_new_bitmap_flags(3alleg5), al_init_image_addon(3alleg5)

Allegro reference manual                                                                 al_load_bitmap(3alleg5)

              #include <allegro5/allegro.h>

              ALLEGRO_BITMAP *al_load_bitmap(const char *filename)