DOKK / manpages / debian 10 / allegro5-doc / al_convert_mask_to_alpha.3alleg5.en
al_convert_mask_to_alpha(3alleg5) al_convert_mask_to_alpha(3alleg5)

al_convert_mask_to_alpha - Allegro 5 API

#include <allegro5/allegro.h>
void al_convert_mask_to_alpha(ALLEGRO_BITMAP *bitmap, ALLEGRO_COLOR mask_color)
    

Convert the given mask color to an alpha channel in the bitmap. Can be used to convert older 4.2-style bitmaps with magic pink to alpha-ready bitmaps.

ALLEGRO_COLOR(3alleg5)

Allegro reference manual