@radulle/cra-squoosh-webp
v1.1.3
Published
Wasm webp encoder and decoder supporting the browser. Repackaged from Squoosh App, CRA compatible fork.
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@jsquash/webp
An easy experience for encoding and decoding WebP images in the browser. Powered by WebAssembly ⚡️.
Uses the libwebp library.
A jSquash package. Codecs and supporting code derived from the Squoosh app.
Installation
npm install --save @jsquash/webp
# Or your favourite package manager alternative
Usage
Note: You will need to either manually include the wasm files from the codec directory or use a bundler like WebPack or Rollup to include them in your app/server.
decode(data: ArrayBuffer): Promise
Decodes WebP binary ArrayBuffer to raw RGB image data.
data
Type: ArrayBuffer
Example
import { decode } from '@jsquash/webp';
const formEl = document.querySelector('form');
const formData = new FormData(formEl);
// Assuming user selected an input WebP file
const imageData = await decode(await formData.get('image').arrayBuffer());
encode(data: ImageData, options?: EncodeOptions): Promise
Encodes raw RGB image data to WebP format and resolves to an ArrayBuffer of binary data.
data
Type: ImageData
options
Type: Partial<EncodeOptions>
The WebP encoder options for the output image. See default values.
Example
import { encode } from '@jsquash/webp';
async function loadImage(src) {
const img = document.createElement('img');
img.src = src;
await new Promise(resolve => img.onload = resolve);
const canvas = document.createElement('canvas');
[canvas.width, canvas.height] = [img.width, img.height];
const ctx = canvas.getContext('2d');
ctx.drawImage(img, 0, 0);
return ctx.getImageData(0, 0, img.width, img.height);
}
const rawImageData = await loadImage('/example.png');
const webpBuffer = await encode(rawImageData);
Manual WASM initialisation (not recommended)
In most situations there is no need to manually initialise the provided WebAssembly modules. The generated glue code takes care of this and supports most web bundlers.
One exception is CloudFlare workers. The environment at this time (this could change in the future) does not allow code to be dynamically imported. It needs to be bundled at runtime. WASM modules are set as global variables. See the Cloudflare workers example.
The encode
and decode
modules both export an init
function that can be used to manually load the wasm module.
import decode, { init as initWebpDecode } from '@jsquash/webp/decode';
const WASM_MODULE = // A WebAssembly.Module object of the compiled wasm binary
initWebpDecode(WASM_MODULE);
const image = await fetch('./image.webp').then(res => res.arrayBuffer()).then(decode);