1al_create_sub_bitmap(3) al_create_sub_bitmap(3)
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6 al_create_sub_bitmap - Allegro 5 API
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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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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 memo‐
17 ry 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 When you are done with using the sub-bitmap you must call al_de‐
30 stroy_bitmap(3) on it to free any resources allocated for it.
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32 Note that destroying parents of sub-bitmaps will not destroy the sub-
33 bitmaps; instead the sub-bitmaps become invalid and should no longer be
34 used for drawing - they still must be destroyed with al_destroy_bit‐
35 map(3) however. It does not matter whether you destroy a sub-bitmap
36 before or after its parent otherwise.
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39 al_create_bitmap(3)
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43Allegro reference manual al_create_sub_bitmap(3)