al_map_rgba - Allegro 5 API

       Convert r, g, b, a (ranging from 0-255) into an ALLEGRO_COLOR(3alleg5).

       This function can be called before Allegro is initialized.

       al_map_rgba - Allegro 5 API

al_map_rgb(3alleg5), al_premul_rgba(3alleg5), al_map_rgb_f(3alleg5)

Allegro reference manual                                                                    al_map_rgba(3alleg5)

              #include <allegro5/allegro.h>

              ALLEGRO_COLOR al_map_rgba(
                 unsigned char r, unsigned char g, unsigned char b, unsigned char a)