LodePNG
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PNG encoder and decoder in C and C++.

Home page: http://lodev.org/lodepng/

Only two files are needed to allow your program to read and write PNG files: lodepng.cpp and lodepng.h.

For C, you can rename lodepng.cpp to lodepng.c and it'll work. C++ only adds extra API.

The other files in the project are just examples, unit tests, etc...