al_get_text_width - Allegro 5 API

       Calculates the length of a string in a particular font, in pixels.

       al_get_text_width - Allegro 5 API

al_get_ustr_width(3alleg5), al_get_font_line_height(3alleg5), al_get_text_dimensions(3alleg5)

Allegro reference manual                                                              al_get_text_width(3alleg5)

              #include <allegro5/allegro_font.h>

              int al_get_text_width(const ALLEGRO_FONT *f, const char *str)