Package Exports

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 (wmf) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

js-wmf

Processor for Windows MetaFile (WMF) files in JS (for the browser and nodejs).

Installation

With npm:

$ npm install wmf

In the browser:

<script src="wmf.js"></script>

The browser exposes a variable WMF.

Usage

The data argument is expected to be an ArrayBuffer, Uint8Array or Buffer

WMF.image_size(data) extracts the image offset and extents, returns an Array [width, height] where both metrics are measured in pixels.
WMF.draw_canvas(data, canvas) parses the WMF and draws to a Canvas.

Notes

The library assumes the global ImageData is available. For nodejs-powered canvas implementations, a shim must be exposed as a global. Using the canvas npm package:

const { createImageData } = require("canvas");
global.ImageData = createImageData;

OffscreenCanvas in Chrome and some other Canvas implementations require the dimensions in the constructor:

const size = WMF.image_size(data);
const canvas = new OffscreenCanvas(size[0], size[1]);

Examples

Browser Fetch into canvas (click to show)

// assume `canvas` is a DOM element
(async() => {
  const res = await fetch("url/for/image.wmf");
  const ab = await res.arrayBuffer();
  WMF.draw_canvas(ab, document.getElementById("canvas"));
})();

NodeJS (using `canvas` npm module) (click to show)

const { createCanvas, createImageData } = require("canvas");
global.ImageData = createImageData;

const size = WMF.image_size(data);
const canvas = createCanvas(size[0], size[1]);
WMF.draw_canvas(data, canvas);

License

Please consult the attached LICENSE file for details. All rights not explicitly granted by the Apache 2.0 License are reserved by the Original Author.

References

MS-WMF: Windows Metafile Format