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+TODO - list of things to do for libpng:

+

+Final bug fixes.

+Fix problem with C++ and EXTERN "C".

+Better C++ wrapper/full C++ implementation?

+Keep up with public chunks.

+sPLT chunk handling.

+cHRM transformation.

+Support for application-defined chunk handlers.

+Improve setjmp/longjmp usage or remove it in favor of returning error codes.

+High-level API for reading images.

+Add "grayscale->palette" transformation and "palette->grayscale" detection.

+Improved dithering.

+Multi-lingual error and warning message support.

+Complete sRGB transformation (presently it simply uses gamma=0.45455).

+Man pages for function calls.

+Better documentation.

+Better filter selection

+   (counting huffman bits/precompression?  filter inertia?  filter costs?).

+Optional palette (sPLT) creation.

+Histogram creation.

+Text conversion between different code pages (Latin-1 -> Mac and DOS).

+Improve API by hiding the info_ptr.

+Make a no-floating-point version.