camunda-modeler/client/lib/app/util/generate-image.js

Camunda Modeler for BPMN, DMN and CMMN, based on bpmn.io

'use strict';

var canvg = require('canvg-browser');

// list of defined encodings
var ENCODINGS = [ 'image/png', 'image/jpeg' ];


function generateImage(type, svg) {
  var encoding = 'image/' + type,
      context,
      canvas;

  if (ENCODINGS.indexOf(encoding) === -1) {
    throw new Error('<' + type + '> is an unknown type for converting svg to image');
  }

  canvas = document.createElement('canvas');

  canvg(canvas, svg);

  // make the background white for every format
  context = canvas.getContext('2d');

  context.globalCompositeOperation = 'destination-over';

  context.fillStyle = 'white';

  context.fillRect(0, 0, canvas.width, canvas.height);

  return canvas.toDataURL(encoding);
}

module.exports = generateImage;