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set_multiply_blender(3)         Allegro manual         set_multiply_blender(3)

NAME
       set_multiply_blender - Enables a multiply blender mode. Allegro game
       programming library.

SYNOPSIS
       #include <allegro.h>

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

DESCRIPTION
       Enables a multiply blender mode for combining translucent or lit
       truecolor pixels. Combines the source and destination images,
       multiplying the colours to produce a darker colour. If a colour is
       multiplied by white it remains unchanged; when multiplied by black it
       also becomes black.

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

Allegro                          version 4.4.2         set_multiply_blender(3)