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       al_create_sub_bitmap - Allegro 5 API


              #include <allegro5/allegro.h>

              ALLEGRO_BITMAP *al_create_sub_bitmap(ALLEGRO_BITMAP *parent,
                 int x, int y, int w, int h)


       Creates  a  sub-bitmap  of  the  parent, at the specified coordinates and of the specified
       size.  A sub-bitmap is a bitmap that shares drawing memory with  a  pre-existing  (parent)
       bitmap, but possibly with a different size and clipping settings.

       The sub-bitmap may originate off or extend past the parent bitmap.

       See   the   discussion  in  al_get_backbuffer(3alleg5)  about  using  sub-bitmaps  of  the

       The parent bitmap's clipping rectangles are ignored.

       If a sub-bitmap was not or cannot be created then NULL is returned.

       When you are done with using the sub-bitmap you must call al_destroy_bitmap(3alleg5) on it
       to free any resources allocated for it.

       Note  that destroying parents of sub-bitmaps will not destroy the sub-bitmaps; instead the
       sub-bitmaps become invalid and should no longer be used for drawing - they still  must  be
       destroyed with al_destroy_bitmap(3alleg5) however.  It does not matter whether you destroy
       a sub-bitmap before or after its parent otherwise.