al_get_glyph_width - Allegro 5 API

       This  function returns the width in pixels of the glyph that corresponds with codepoint in the font font.
       Returns zero if the font does not have such a glyph.

       al_get_glyph_width - Allegro 5 API

al_draw_glyph(3alleg5), al_get_glyph_dimensions(3alleg5), al_get_glyph_advance(3alleg5).

Allegro reference manual                                                             al_get_glyph_width(3alleg5)

       5.1.12

              #include <allegro5/allegro_font.h>

              int al_get_glyph_width(const ALLEGRO_FONT *f, int codepoint)