TODO - list of things to do for libpng:+
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Final bug fixes.+
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Improve API by hiding the png_struct and png_info structs.+
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Finish work on the no-floating-point version (including gamma compensation)+
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Better C++ wrapper/full C++ implementation?+
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Fix problem with C++ and EXTERN "C".+
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cHRM transformation.+
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Improve setjmp/longjmp usage or remove it in favor of returning error codes.+
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Add "grayscale->palette" transformation and "palette->grayscale" detection.+
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Improved dithering.+
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Multi-lingual error and warning message support.+
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Complete sRGB transformation (presently it simply uses gamma=0.45455).+
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Man pages for function calls.+
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Better documentation.+
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Better filter selection+
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   (counting huffman bits/precompression?  filter inertia?  filter costs?).+
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Histogram creation.+
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Text conversion between different code pages (Latin-1 -> Mac and DOS).+
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Should we always malloc 2^bit_depth PLTE/tRNS/hIST entries for safety?+
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Build gamma tables using fixed point (and do away with floating point entirely).+
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Use greater precision when changing to linear gamma for compositing against+
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  background and doing rgb-to-gray transformation.+
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Investigate pre-incremented loop counters and other loop constructions.+
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Add interpolated method of handling interlacing.+
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