Package Exports

@cf-wasm/png
@cf-wasm/png/index.js

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (@cf-wasm/png) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

PNG encoder and decoder CF workers

PNG encoder and decoder for Cloudflare Workers using WebAssembly.

Installation

Install the package:

npm install @cf-wasm/png

Example

Usage in Cloudflare Workers:

import * as photon from "@cf-wasm/photon";
import * as png from "@cf-wasm/png";

photon.initCloudflare();
png.initCloudflare();

const worker: ExportedHandler<Env> = {
  async fetch() {
    const imageUrl = "https://avatars.githubusercontent.com/u/314135";

    const imageBuffer = await fetch(imageUrl).then((res) => res.arrayBuffer());
    const imageBytes = new Uint8Array(imageBuffer);

    const inputImage = photon.PhotonImage.new_from_byteslice(imageBytes);

    // resizing using photon
    const outputImage = photon.resize(inputImage, inputImage.get_width() * 0.5, inputImage.get_height() * 0.5, 1);

    // encoding using png
    const outputPng = png.encode(outputImage.get_raw_pixels(), outputImage.get_width(), outputImage.get_height());

    const imageResponse = new Response(outputPng, {
      headers: {
        "Content-Type": "image/png"
      }
    });

    inputImage.free();
    outputImage.free();

    return imageResponse;
  }
};

export default worker;