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Improve pngvalid coverage of filter combinations, remove the (new in 1.7) code which disabled previous-row filters on the first row of an image in some cases. Signed-off-by: John Bowler <jbowler@acm.org>
This "contrib" directory contains contributions which are not necessarily under the libpng license, although all are open source. They are not part of libpng proper and are not used for building the library, although some are used for testing the library via "make check".