debian man page for set_difference_blender

set_difference_blender(3alleg4) 				  Allegro manual				   set_difference_blender(3alleg4)

NAME
       set_difference_blender - Enables a difference blender mode. Allegro game programming library.

SYNOPSIS
       #include <allegro.h>

       void set_difference_blender(int r, int g, int b, int a);

DESCRIPTION
       Enables	a  difference  blender mode for combining translucent or lit truecolor pixels. This makes an image which has colours calculated by
       the difference between the source and destination colours.

SEE ALSO
       set_trans_blender(3alleg4), drawing_mode(3alleg4)

Allegro 							   version 4.4.2				   set_difference_blender(3alleg4)