Glenn Randers-Pehrson 96b917056d [libpng16] Revised png_set_keep_unknown_chunks() so num_chunks < 0 means ...

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.

2012-06-16 13:26:28 -05:00

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