al_get_text_width man page
al_get_text_width — Allegro 5 API Calculates the length of a string in a particular font, in pixels. al_get_ustr_width(3), al_get_font_line_height(3), al_get_text_dimensions(3) al_get_font_line_height(3), al_get_text_dimensions(3), al_get_ustr_width(3).Synopsis
#include <allegro5/allegro_font.h>
int al_get_text_width(const ALLEGRO_FONT *f, const char *str)
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Allegro reference manual