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6cc84b3c44
Fixes to pngvalid for various reduced build configurations (eliminate unused statics) and a fix for the case in rgb_to_gray when the digitize option reduces graylo to 0, producing a large error. 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".