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84a8bb8244
This removes the side-effect on the png_struct palette of calling png_set_PLTE or png_set_tRNS. NOTE: this is a quiet API change, it was possible before to alter the palette on a PNG image by using png_set_PLTE, but this was unintended and inconsistent with the other png_set APIs. Fix a bug in palette index checking; png_struct::num_palette could, in principle, get changed by the transformations (e.g. png_set_quantize) and this would invalidate the check. The palette checking init function now makes a copy of png_struct::num_palette. Fix a bug in pngvalid error handling. A png_error in png_write_info is not continuable (a valid image cannot necessarily be written afterward) because the png_error aborts the write of subsequent pre-IDAT chunks. In particular an abort as a result of a bogus colorspace information (gAMA, cHRM, sBIT etc) prevents the write of the PLTE chunk. 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".