al_get_backbuffer man page on DragonFly

al_get_backbuffer man page on DragonFly

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al_get_backbuffer(3)					  al_get_backbuffer(3)

NAME
       al_get_backbuffer - Allegro 5 API

SYNOPSIS
	      #include <allegro5/allegro.h>

	      ALLEGRO_BITMAP *al_get_backbuffer(ALLEGRO_DISPLAY *display)

DESCRIPTION
       Return a special bitmap representing the back-buffer of the display.

       Care should be taken when using the backbuffer bitmap (and its sub-bit‐
       maps) as the source bitmap (e.g as the bitmap argument to  al_draw_bit‐
       map(3)).	 Only untransformed operations are hardware accelerated.  This
       consists of al_draw_bitmap(3)  and  al_draw_bitmap_region(3)  when  the
       current	transformation	is  the identity.  If the tranformation is not
       the identity, or some other drawing operation is used, the call will be
       routed through the memory bitmap routines, which are slow.  If you need
       those operations to be accelerated, then first copy  a  region  of  the
       backbuffer  into	 a  temporary  bitmap  (via  the al_draw_bitmap(3) and
       al_draw_bitmap_region(3)), and then use that temporary  bitmap  as  the
       source bitmap.

Allegro reference manual				  al_get_backbuffer(3)

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