Enables a saturation blender mode. allegro game programming library.
#include <allegro.h>
void set_saturation_blender(int r, int g, int b, int a);
Enables a saturation blender mode for combining translucent or lit truecolor pixels. Applies the saturation of the source to the destination image.
set_trans_blender(3alleg4), drawing_mode(3alleg4)