al_create_sub_bitmap(3)                                al_create_sub_bitmap(3)

NAME
       al_create_sub_bitmap - Allegro 5 API

SYNOPSIS

              #include <allegro5/allegro.h>

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


DESCRIPTION
       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(3) about using sub-bitmaps of
       the backbuffer.

       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(3) 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(3) however.  It does not matter whether you destroy a
       sub-bitmap before or after its parent otherwise.

SEE ALSO
       al_create_bitmap(3)

Allegro reference manual                               al_create_sub_bitmap(3)