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.

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.

SEE ALSO

al_create_bitmap(3)