[1/2] windowscodecs: Implement GetPreview and GetThumbnail in the TIFF decoder.

Vincent Povirk madewokherd at gmail.com
Fri Jun 22 08:46:52 CDT 2012

According to MSDN, GetPreview isn't supported on any decoder except
WMPhoto, and if that's true it should probably be returning

And why bother with GetThumbnail if you're not going to do it
properly? At least check whether a thumbnail exists in the image
before returning something.

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