set_write_alpha_blender man page on DragonFly

set_write_alpha_blender man page on DragonFly

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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 draw‐
       ing  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 val‐
       ues (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 super‐
       impose 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),	 exal‐
       pha(3), extrans(3)

Allegro				 version 4.4.2	    set_write_alpha_blender(3)

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