al_load_font - Allegro 5 API

       Loads a font from disk.  This will use al_load_bitmap_font_flags(3alleg5) if you pass the name of a known
       bitmap format, or else al_load_ttf_font(3alleg5).

       The  flags  parameter  is  passed  through  to  either of those functions.  Bitmap and TTF fonts are also
       affected by the current [bitmap flags]al_set_new_bitmap_flags(3alleg5) at the time the font is loaded.

       al_load_font - Allegro 5 API

al_destroy_font(3alleg5),         al_init_font_addon(3alleg5),          al_register_font_loader(3alleg5),
       al_load_bitmap_font_flags(3alleg5), al_load_ttf_font(3alleg5)

Allegro reference manual                                                                   al_load_font(3alleg5)

              #include <allegro5/allegro_font.h>

              ALLEGRO_FONT *al_load_font(char const *filename, int size, int flags)