al_get_text_dimensions - Allegro 5 API

       Sometimes,  the  al_get_text_width(3alleg5) and al_get_font_line_height(3alleg5) functions are not enough
       for exact text placement, so this function returns some additional information.

       Returned variables (all in pixels):

       • x, y - Offset to upper left corner of bounding box.

       • w, h - Dimensions of bounding box.

       Note that glyphs may go to the left and upwards of the X, in which  case  x  and  y  will  have  negative
       values.

       al_get_text_dimensions - Allegro 5 API

al_get_text_width(3alleg5), al_get_font_line_height(3alleg5), al_get_ustr_dimensions(3alleg5)

Allegro reference manual                                                         al_get_text_dimensions(3alleg5)

              #include <allegro5/allegro_font.h>

              void al_get_text_dimensions(const ALLEGRO_FONT *f,
                 char const *text,
                 int *bbx, int *bby, int *bbw, int *bbh)