/* * JavaScript Canvas to Blob 2.0.2 * https://github.com/blueimp/JavaScript-Canvas-to-Blob * * Copyright 2012, Sebastian Tschan * https://blueimp.net * * Licensed under the MIT license: * http://www.opensource.org/licenses/MIT * * Based on stackoverflow user Stoive's code snippet: * http://stackoverflow.com/q/4998908 */ /*jslint nomen: true, regexp: true */ /*global window, atob, Blob, ArrayBuffer, Uint8Array, define */ (function (window) { 'use strict'; var CanvasPrototype = window.HTMLCanvasElement && window.HTMLCanvasElement.prototype, hasBlobConstructor = function () { try { return !!new Blob(); } catch (e) { return false; } }(), BlobBuilder = window.BlobBuilder || window.WebKitBlobBuilder || window.MozBlobBuilder || window.MSBlobBuilder, dataURLtoBlob = (hasBlobConstructor || BlobBuilder) && window.atob && window.ArrayBuffer && window.Uint8Array && function (dataURI) { var byteString, arrayBuffer, intArray, i, bb, mimeString; if (dataURI.split(',')[0].indexOf('base64') >= 0) { // Convert base64 to raw binary data held in a string: byteString = atob(dataURI.split(',')[1]); } else { // Convert base64/URLEncoded data component to raw binary data: byteString = decodeURIComponent(dataURI.split(',')[1]); } // Write the bytes of the string to an ArrayBuffer: arrayBuffer = new ArrayBuffer(byteString.length); intArray = new Uint8Array(arrayBuffer); for (i = 0; i < byteString.length; i += 1) { intArray[i] = byteString.charCodeAt(i); } // Separate out the mime component: mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0]; // Write the ArrayBuffer to a blob: if (hasBlobConstructor) { return new Blob([arrayBuffer], {type: mimeString}); } bb = new BlobBuilder(); bb.append(arrayBuffer); return bb.getBlob(mimeString); }; if (window.HTMLCanvasElement && !CanvasPrototype.toBlob) { if (CanvasPrototype.mozGetAsFile) { CanvasPrototype.toBlob = function (callback, type) { callback(this.mozGetAsFile('blob', type)); }; } else if (CanvasPrototype.toDataURL && dataURLtoBlob) { CanvasPrototype.toBlob = function (callback, type) { callback(dataURLtoBlob(this.toDataURL(type))); }; } } if (typeof define !== 'undefined' && define.amd) { define(function () { return dataURLtoBlob; }); } else { window.dataURLtoBlob = dataURLtoBlob; } }(this));