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Suggest using itskyedo/woff2-encoder instead of fontello/wawoff2 for decompressing woff2 files #805

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Suggest using itskyedo/woff2-encoder instead of fontello/wawoff2 for decompressing woff2 files #805

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614a733
use woff2-encoder
SarcevicAntonio Jun 3, 2025
f3b9cfa
Update README.md
SarcevicAntonio Jun 3, 2025
886359d
Update README.md
SarcevicAntonio Jun 3, 2025
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23 changes: 7 additions & 16 deletions README.md
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Expand Up @@ -109,24 +109,15 @@ buffer.then(data => {
WOFF2 Brotli compression perform [29% better](https://www.w3.org/TR/WOFF20ER/#appendixB) than it WOFF predecessor.
But this compression is also more complex, and would result in a much heavier (>10×!) opentype.js library (≈120KB => ≈1400KB).

To solve this: Decompress the font beforehand (for example with [fontello/wawoff2](https://github.com/fontello/wawoff2)).
To solve this: Decompress the font beforehand (for example with [itskyedo/woff2-encoder](https://github.com/itskyedo/woff2-encoder)).

```js
// promise-based utility to load libraries using the good old <script> tag
const loadScript = (src) => new Promise((onload) => document.documentElement.append(
Object.assign(document.createElement('script'), {src, onload})
));

const buffer = //...same as previous example...

// load wawoff2 if needed, and wait (!) for it to be ready
if (!window.Module) {
const path = 'https://unpkg.com/[email protected]/build/decompress_binding.js'
const init = new Promise((done) => window.Module = { onRuntimeInitialized: done});
await loadScript(path).then(() => init);
}
// decompress before parsing
const font = opentype.parse(Module.decompress(await buffer));
import { parse } from 'opentype.js';
import decompress from 'woff2-encoder/decompress';

const woff2Buffer = await fetch('/fonts/my.woff2').then(r => r.arrayBuffer());
const { buffer } = await decompress(woff2Buffer);
const font = parse(buffer);
```
</details>

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