set_dodge_blender - Man Page

#include <allegro.h>

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

Enables a dodge blender mode for combining translucent or lit truecolor  pixels. The lightness of colours in the source lighten the colours of the  destination. White has the most effect; black has none.

set_trans_blender(3), drawing_mode(3)

set_trans_blender(3).