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cde9b583a8
Implemented better defaulting of zlib settings based on image properties. Implemented pass-through of png_write_rows when the rows can be used directly (a common case) optimizing the handling of previous-row buffering. Removed the METHODICAL filter selection method and disabled the HEURISTIC one; the first was ridiculously slow (though useful for experiments) the second doesn't work. Filter selection is temporarily disabled (it defaults to the lowest numbered filter in the list; typically 'none'). New handling of compression settings (incomplete), new PNG compression level (not yet visible in an API). Back ported 'PNG_FAST_FILTERS' from 1.6 (in png.h). There are minimal API changes beyond removal of the selection options. Work is still to be done to investigate a filter selection mechanism that is at least as good as the previous one. 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".