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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>