al_save_bitmap_f - Allegro 5 API

       Saves  an ALLEGRO_BITMAP(3alleg5) to an ALLEGRO_FILE(3alleg5) stream.  The file type is determined by the
       passed `ident' parameter, which is a file name extension including the leading dot.

       Returns true on success, false on error.  The file remains open afterwards.

              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_save_bitmap_f - Allegro 5 API

al_save_bitmap(3alleg5), al_register_bitmap_saver_f(3alleg5), al_init_image_addon(3alleg5)

Allegro reference manual                                                               al_save_bitmap_f(3alleg5)

              #include <allegro5/allegro.h>

              bool al_save_bitmap_f(ALLEGRO_FILE *fp, const char *ident,
                 ALLEGRO_BITMAP *bitmap)