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strip option. pngfix relied on undefined behavior and even a simple change from gcc to g++ caused it to fail. The new strip option 'unsafe' has been implemented and is the default if --max is given. Option names have been clarified, with --strip=transform now stripping the bKGD chunk, which was stripped previously with --strip=unused. Added all documented chunk types to pngpriv.h
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.