Wasm Pixelmatch

This is an experimental port of https://github.com/mapbox/pixelmatch to Rust and Wasm.

Building:

wasm-pack build --target nodejs

Using:

const { pixelmatch } = require('./pkg/wasm_pixelmatch.js');
// ...

Measurement: comparing red 1280 x 720 image with white 1280 x 720 images; threshold = 0.2, the rest is default.

pixelmatch: 67.481ms
wasm.pixelmatch: 45.518ms