Image decoding in WASM

Now with first class support.

And it works, on everyone's machine.

Compiling

You need to have rustc, cargo and wasm-pack installed to compile

To compile this, follow the following instructions

wasm-pack build

will create a new directory called pkg which will contain the generated web assembly and Javascript and typescript bindings.

To get more speed, one can leverage WASM fixed width simd which allows the compiler's autovectorizer to write some functions in SIMD

This isn't supported in Safari.

To get SIMD run

RUSTFLAGS="-C target-feature=+simd128" wasm-pack build

One can investigate that SIMD is compiled by loading the WASM into the browser, browser logs will contain details about SIMD(and other extra things)