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In a follow-up patch we may have glyphs with a NULL picture. To cope with that, always set the pictures for glyphs to NULL at creation time and cope with cleaning up such glyphs. Also, since compositing a NULL source doesn't do a lot anyway, skip trying to do so. Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net> Reviewed-by: Keith Packard <keithp@keithp.com>