norm

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, norm 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

# Run the renderer with an experimental camera
cargo r --features camera -- ./tests/obama.png

# Profile the decoder
cargo b --release && samply record ./target/release/norm_decode_png ./tests/reagan.png

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

# Parse and render glyphs from the lato font file
# See the generated `glyph_playground` directory.
cargo r --bin norm_lato_glyphs hfkdp!

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

# Fuzz the decoder
./fuzz.sh

Reading

PNG Specification

https://www.w3.org/TR/2003/REC-PNG-20031110/ http://www.libpng.org/pub/png/pngintro.html https://www.w3.org/Graphics/PNG/platform.html https://optipng.sourceforge.net/pngtech/optipng.html https://optipng.sourceforge.net/pngtech/better-filtering.html http://www.libpng.org/pub/png/pngpic2.html https://www.lucaversari.it/FJXL_and_FPNGE.pdf

GPU Programming

https://sotrh.github.io/learn-wgpu/beginner/tutorial5-textures/ https://raphlinus.github.io/gpu/2020/02/12/gpu-resources.html

Image Processing

https://www.youtube.com/watch?v=KuXjwB4LzSA https://www.shadertoy.com/view/4tSyzy https://www.shadertoy.com/view/wsK3Wt

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

TrueType Font Rendering

https://faultlore.com/blah/text-hates-you/ https://developer.apple.com/fonts/TrueType-Reference-Manual/ https://www.youtube.com/watch?v=SO83KQuuZvg https://www.microsoft.com/en-us/research/wp-content/uploads/2005/01/p1000-loop.pdf https://medium.com/@evanwallace/easy-scalable-text-rendering-on-the-gpu-c3f4d782c5ac

Miscellaneous

https://www.joelonsoftware.com/2003/10/08/the-absolute-minimum-every-software-developer-absolutely-positively-must-know-about-unicode-and-character-sets-no-excuses/