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96b917056d
ignore all unknown chunks and all known chunks except for IHDR, PLTE, tRNS, IDAT, and IEND. Previously it only meant ignore all unknown chunks, the same as num_chunks == 0. Revised png_image_skip_unused_chunks() to provide a list of chunks to be processed instead of a list of chunks to ignore. Revised contrib/gregbook/readpng2.c accordingly.
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.