set_write_alpha_blender(3alleg4)				  Allegro manual				  set_write_alpha_blender(3alleg4)

NAME

       set_write_alpha_blender - Enables the special alpha-channel editing mode. Allegro game programming library.

SYNOPSIS

       #include <allegro.h>

       void set_write_alpha_blender();

DESCRIPTION

       Enables	the special alpha-channel editing mode, which is used for drawing alpha channels over the top of an existing 32-bit RGB sprite, to
       turn it into an RGBA format image. After calling this function, you can set the drawing mode to DRAW_MODE_TRANS and then write  draw  color
       values  (0-255)	onto  a  32-bit image. This will leave the color values unchanged, but alter the alpha to whatever values you are writing.
       After enabling this mode you can also use draw_trans_sprite() to superimpose an 8-bit alpha mask over the top of an existing 32-bit sprite.

SEE ALSO

       set_alpha_blender(3alleg4), draw_trans_sprite(3alleg4), drawing_mode(3alleg4), exalpha(3alleg4), extrans(3alleg4)

Allegro 							   version 4.4.2				  set_write_alpha_blender(3alleg4)