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)