set_invert_blender - Enables an invert blender mode. Allegro game programming library.

       Enables  an invert blender mode for combining translucent or lit truecolor pixels. Blends the inverse (or
       negative) colour of the source with the destination.

       set_invert_blender - Enables an invert blender mode. Allegro game programming library.

set_trans_blender(3alleg4), drawing_mode(3alleg4)

Allegro                                           version 4.4.3                      set_invert_blender(3alleg4)

#include<allegro.h>voidset_invert_blender(intr,intg,intb,inta);