al_set_bitmap_blend_color - Allegro 5 API

       Sets the color to use for ALLEGRO_CONST_COLOR or ALLEGRO_INVERSE_CONST_COLOR blend operations.

       al_set_bitmap_blend_color - Allegro 5 API

al_set_bitmap_blender(3alleg5), al_reset_bitmap_blender(3alleg5)

Allegro reference manual                                                      al_set_bitmap_blend_color(3alleg5)

       5.2.5

              [UnstableAPI]: New API.

              #include <allegro5/allegro.h>

              void al_set_bitmap_blend_color(ALLEGRO_COLOR col)