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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  un-
       changed,	 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),	 exal-
       pha(3), extrans(3)

Allegro				 version 4.4.3	    set_write_alpha_blender(3)
NAME | SYNOPSIS | DESCRIPTION | SEE ALSO

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