iris

A PNG editor from scratch (well, as close to scratch as possible).

As a decoder, this project uses the PNG test suite to validate its ability to handle various PNG features and edge cases. Currently, png can decode and render images with an 8-bit color depth.

The renderer supports various image processing features on the GPU.

Usage

Run cargo run --release <image_path>. For example:

cargo r --release ./tests/obama.png

Additional Scripts

# Profile the decoder
./profile_decoder.sh ./tests/reagan.png

# Run ad-hoc benchmarks
cargo r --release --bin decode --features time ./tests/Periodic_table_large.png

# Run the PNG test suite
cargo r --bin png-test-suite

# Fuzz the decoder
./fuzz.sh

Reading

PNG Specification

http://www.libpng.org/pub/png/pngintro.html
https://www.w3.org/TR/2003/REC-PNG-20031110/
http://www.libpng.org/pub/png/pngpic2.html
https://www.w3.org/Graphics/PNG/platform.html

GPU Rendering

https://sotrh.github.io/learn-wgpu/beginner/tutorial5-textures/

Image Processing

https://www.cns.nyu.edu/pub/lcv/wang03-preprint.pdf
https://www.cns.nyu.edu/pub/eero/wang03b.pdf
https://ece.uwaterloo.ca/~z70wang/research/ssim/
http://arxiv.org/pdf/2006.13846

https://www.youtube.com/watch?v=KuXjwB4LzSA
https://www.shadertoy.com/view/4tSyzy

Typography

https://faultlore.com/blah/text-hates-you/
https://developer.apple.com/fonts/TrueType-Reference-Manual/

Miscellaneous

https://optipng.sourceforge.net/pngtech/optipng.html