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This is still a work-in-progress but it seems fairly stable (if not exactly 100% optimal). pngcp now allows 'all' for some options which iterates through all possible settings (this reliably produces the smallest IDAT that libpng can produce with those settings.) It also contains a --search command line option which attempts to optimize this by skipping pointless tests; it is close, most of the time, but not perfect. 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".