-fixes pdflib_adapter::image() which does not conform to the Canvas interface (issue 284)
-fixes pdflib_adapter::image() which does not conform to the Canvas interface (issue 284)

git-svn-id: b31ceac1d759b3771e0bab247dec50e2f8c5649e@395 8e70de24-3a84-11de-b438-597f59cd7555

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