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Rich Geldreich
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# fpng
fpng is a very fast C++ .PNG image reader/writer for 24/32bpp images. It's a [single source file](src/fpng.h) with no dependencies on any other library. fpng.cpp was written to see just how fast you can write .PNG's without sacrificing too much compression. The files written by fpng conform to the [PNG standard](https://www.w3.org/TR/PNG/), are readable using any PNG decoder, and load or validate successfully using libpng, wuffs, lodepng, stb_image, and [pngcheck](http://www.libpng.org/pub/png/apps/pngcheck.html). PNG files written using fpng can also be read using fpng significantly faster than other PNG libraries, due to its explicit use of [Length-Limited Prefix Codes](https://create.stephan-brumme.com/length-limited-prefix-codes/) and an [optimized decoder](https://fastcompression.blogspot.com/2015/10/huffman-revisited-part-4-multi-bytes.html) that exploits the properties of these codes.
fpng is a very fast C++ .PNG image reader/writer for 24/32bpp images. It's a [single source file](src/fpng.h) with no dependencies on any other library. fpng.cpp was written to see just how fast you can write .PNG's without sacrificing too much compression. The files written by fpng conform to the [PNG standard](https://www.w3.org/TR/PNG/), are readable using any PNG decoder, and load or validate successfully using libpng, wuffs, lodepng, stb_image, and [pngcheck](http://www.libpng.org/pub/png/apps/pngcheck.html). PNG files written using fpng can also be read using fpng faster than other PNG libraries, due to its explicit use of [Length-Limited Prefix Codes](https://create.stephan-brumme.com/length-limited-prefix-codes/) and an [optimized decoder](https://fastcompression.blogspot.com/2015/10/huffman-revisited-part-4-multi-bytes.html) that exploits the properties of these codes.
fpng.cpp compression compared to stb_image_write.h: 12-19x faster with roughly 5-11% avg. smaller files.