DOKK / manpages / debian 11 / allegro4-doc / set_luminance_blender.3alleg4.en
set_luminance_blender(3alleg4) Allegro manual set_luminance_blender(3alleg4)

set_luminance_blender - Enables a luminance blender mode. Allegro game programming library.

#include <allegro.h>

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

Enables a luminance blender mode for combining translucent or lit truecolor pixels. Applies the luminance of the source to the destination. The colour of the destination is not affected.

set_trans_blender(3alleg4), drawing_mode(3alleg4)

version 4.4.3 Allegro