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.TH "al_create_sub_bitmap" "3" "" "Allegro reference manual" ""
.SH NAME
al_create_sub_bitmap \- Allegro 5 API
.SH SYNOPSIS
.IP
.EX
#include \f[B]<allegro5/allegro.h>\f[R]

ALLEGRO_BITMAP *al_create_sub_bitmap(ALLEGRO_BITMAP *parent,
   int x, int y, int w, int h)
.EE
.SH 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.
.PP
The sub\-bitmap may originate off or extend past the parent bitmap.
.PP
See the discussion in al_get_backbuffer(3) about using sub\-bitmaps of
the backbuffer.
.PP
The parent bitmap\[cq]s clipping rectangles are ignored.
.PP
If a sub\-bitmap was not or cannot be created then NULL is returned.
.PP
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.
.PP
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.
.SH SEE ALSO
al_create_bitmap(3)