set_saturation_blender - 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(3alleg), drawing_mode(3alleg)