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JPEG XL decoder in JavaScript using WebAssembly (WASM)
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niutech/jxl.js
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This is a JPEG XL decoder in JavaScript using WebAssembly implementation from theSquoosh app running in Web Worker.
Just insert your JPEG XL images to your HTML document as usual:<img src="image.jxl" alt="..." width="..." height="..."> and append the minified JXL.js script to the<head> of your web page:
<script src="jxl.min.js"></script>
That's it!
You can enable/disable cache and choose target image type (JPEG/PNG/WebP) by editing config at the beginning ofjxl.js file.
JXL.js uses Mutation Observer to watch for<img> and<picture> tags being added to the DOM as well as CSS background images and it decodes them as they appear using WebAssembly decoder in Web Worker. Then the JPEG XL image data is transcoded into JPEG/PNG/WebP image and cached usingCache API for faster subsequent page views (you can delete cached images usingDev Tools). The transcoding is performed using Offscreen Canvas in Web Worker for jank-free performance, if available.
There is an experimental multithread version of JXL.js using 4 threads in Web Workers and WebAssembly SIMD operations, if available, based on thelibjxl wasm demo. Requires HTTPS as well asCross-Origin-Opener-Policy andCross-Origin-Embedder-Policy response headers (or the provided Service Worker script as a fallback).
| Single-thread | Multi-thread | |
|---|---|---|
| test.jxl | 790 ms | 440 ms |
| test2.jxl | 830 ms | 590 ms |
Tested on Microsoft Edge 108, average times, no cache.
© 2022 Jerzy Głowacki and Squoosh Developers under Apache 2.0 License.
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JPEG XL decoder in JavaScript using WebAssembly (WASM)
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