al_get_bitmap_blender - Man Page

#include <allegro5/allegro.h>

void al_get_bitmap_blender(int *op, int *src, int *dst)

Returns the current blender being used by the target bitmap. You can pass NULL for values you are not interested in.

5.2.5

al_set_bitmap_blender(3), al_get_separate_bitmap_blender(3)