Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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TODO - list of things to do for libpng:
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* Fix all defects (duh!)
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* Better C++ wrapper / full C++ implementation (?)
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* Fix the problems with C++ and 'extern "C"'.
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* cHRM transformation.
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* Palette creation.
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* "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. (Currently 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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(e.g., counting huffman bits/precompression; filter inertia; filter costs).
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* Histogram creation.
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* Text conversion between different code pages (e.g., Latin-1 -> Mac).
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* Avoid building gamma tables whenever possible.
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* Greater precision in changing to linear gamma for compositing against
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background, and in doing rgb-to-gray transformations.
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* Investigate pre-incremented loop counters and other loop constructions.
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* Interpolated method of handling interlacing.
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* More validations for libpng transformations.
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