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TODO - list of things to do for libpng: * Fix all defects (duh!) * Better C++ wrapper / full C++ implementation (?) * Fix the problems with C++ and 'extern "C"'. * cHRM transformation. * Palette creation. * "grayscale->palette" transformation and "palette->grayscale" detection. * Improved dithering. * Multi-lingual error and warning message support. * Complete sRGB transformation. (Currently it simply uses gamma=0.45455.) * Man pages for function calls. * Better documentation. * Better filter selection (e.g., counting huffman bits/precompression; filter inertia; filter costs). * Histogram creation. * Text conversion between different code pages (e.g., Latin-1 -> Mac). * Avoid building gamma tables whenever possible. * Greater precision in changing to linear gamma for compositing against background, and in doing rgb-to-gray transformations. * Investigate pre-incremented loop counters and other loop constructions. * Interpolated method of handling interlacing. * More validations for libpng transformations.