set_write_alpha_blender(3)      Allegro manual      set_write_alpha_blender(3)



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



Allegro                          version 4.2.3      set_write_alpha_blender(3)
