.\" Generated by the Allegro makedoc utility
.TH set_write_alpha_blender 3alleg4 "version 4.4.3" "Allegro" "Allegro manual"
.SH NAME
set_write_alpha_blender \- Enables the special alpha-channel editing mode. Allegro game programming library.\&
.SH SYNOPSIS
.B #include <allegro.h>

.sp
.B void set_write_alpha_blender();
.SH 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.

.SH SEE ALSO
.BR set_alpha_blender (3alleg4),
.BR draw_trans_sprite (3alleg4),
.BR drawing_mode (3alleg4),
.BR exalpha (3alleg4),
.BR extrans (3alleg4)