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It needs to include the "UP" filter so that libpng knows to retain the first line for the UP filter on the next one. Without this libpng ended up using NONE for the second line. 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.