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al_get_backbuffer(3)					  al_get_backbuffer(3)

       al_get_backbuffer - Allegro 5 API

	      #include <allegro5/allegro.h>

	      ALLEGRO_BITMAP *al_get_backbuffer(ALLEGRO_DISPLAY	*display)

       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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