A modern ESM build of the Potrace library for use in the browser.

Related tags

Miscellaneous javascript wasm potrace potrace-js potrace-port
Overview

ESM Potrace Wasm

A modern ESM build of the Potrace library for use in the browser.

Installation

npm install --save esm-potrace-wasm

Usage

import potrace from 'esm-potrace-wasm';

/**
 * The `imageBitmapSource` parameter is an `ImageBitmapSource`, that is any of:
 * - `HTMLImageElement`
 * - `SVGImageElement`
 * - `HTMLVideoElement`
 * - `HTMLCanvasElement`
 * - `ImageData`
 * - `ImageBitmap`
 * - `Blob`
 */
const svg = await potrace(
  imageBitmapSource,
  (options = {
    turdsize: 2,
    turnpolicy: 4,
    alphamax: 1,
    opticurve: 1,
    opttolerance: 0.2,
    pathonly: false,
  })
);

Developing

Modify src/potrace/ and run npm run build to update the ESM build in dist/. The emscripten build file is located at ./build.sh. A simple demo that imports dist/index.js is available in demo/ and can be started by running npm start.

Apps using this

This library is used in SVGcode.

SVGcode application screenshot

License

⚠️ GPL-v2.0, due to the original Potrace license.

Acknowledgements

Based on @nturley's fork of @IguteChung's initial potrace-wasm. Unfortunately, the original author did not react on my Pull Request, so I forked.

Issues
  • Create colored svg in c++ code.

    Create colored svg in c++ code.

    • Create colored svg in c++ code. Basically it is simillar algoritm from repo https://github.com/tomayac/SVGcode The porpouse was to speedup colored svg by using c++ code.
    • Create building scripts for windows platform
    • Use em++ compiler to use c++ language
    opened by sylmroz 11
  • Add ready() to fix parallel issue

    Add ready() to fix parallel issue

    This PR exports the ready() module function we'll use to allow parallel computing. This will be used to fix https://github.com/tomayac/SVGcode/issues/20

    Basically all it's needed after that is to call await ready() before calling multiple times potrace() in parallel.

    @tomayac Please review.

    opened by beaufortfrancois 0
  • Bug: Image size limit

    Bug: Image size limit

    This library produces a "RangeError: offset is out of bounds" when loading LARGE images. I have not isolated the break point, but for reference this image will definitely cause the problem condition and I'm sure I could find examples where it occurs on images half that size. Changing input options does not fix the problem. (Using safari and chrome on mac)

    opened by foomoon 1
  • Try again with proper build

    Try again with proper build

    @connorjclark This is a second attempt. I guess I simply don't get what to do with Module. I tried to follow this example, but not sure it's applicable.

    The main idea is to get rid of this hack, where I append export { potrace, ready as init }; to the output: https://github.com/tomayac/esm-potrace-wasm/blob/7d81a9c19ed74fe135107a9328b7adc58a5b8f57/package.json#L25

    The proper way to get a module seems to be -s "MODULARIZE=1" -s "EXPORT_ES6=1".

    opened by tomayac 0
Owner
Thomas Steiner
Developer Relations Engineer at @Google—focused on the Web and Project Fugu 🐡. Dad-of-3. Alum of @UniversiteLyon (Postdoc), @la_UPC (PhD), @KITKarlsruhe (MA)
Thomas Steiner
GitHub Repository https://tomayac.github.io/esm-potrace-wasm/demo/index.html
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