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(3alleg5) 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(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 be‐
       come invalid and should no longer be used for  drawing  -  they  still  must  be  destroyed  with  al_de‐
       stroy_bitmap(3alleg5)  however.   It does not matter whether you destroy a sub-bitmap before or after its
       parent otherwise.

SEE ALSO

       al_create_bitmap(3alleg5)

Allegro reference manual                                                           al_create_sub_bitmap(3alleg5)