1al_create_sub_bitmap(3)    Library Functions Manual    al_create_sub_bitmap(3)
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NAME

6       al_create_sub_bitmap
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SYNOPSIS

9              #include <allegro5/allegro.h>
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11              ALLEGRO_BITMAP *al_create_sub_bitmap(ALLEGRO_BITMAP *parent,
12                 int x, int y, int w, int h)
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DESCRIPTION

15       Creates a sub-bitmap of the parent, at the specified coordinates and of
16       the specified size.  A sub-bitmap is a bitmap that shares drawing  mem‐
17       ory  with a pre-existing (parent) bitmap, but possibly with a different
18       size and clipping settings.
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20       The sub-bitmap may originate off or extend past the parent bitmap.
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22       See the discussion in al_get_backbuffer(3) about using  sub-bitmaps  of
23       the backbuffer.
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25       The parent bitmap's clipping rectangles are ignored.
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27       If a sub-bitmap was not or cannot be created then NULL is returned.
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29       Note  that  destroying parents of sub-bitmaps will not destroy the sub-
30       bitmaps; instead the sub-bitmaps become invalid and should no longer be
31       used.
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SEE ALSO

34       al_create_bitmap(3)
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38Allegro reference manual                               al_create_sub_bitmap(3)