92 lines
2.8 KiB
JavaScript
92 lines
2.8 KiB
JavaScript
/*
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* JavaScript Canvas to Blob 2.0.5
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* https://github.com/blueimp/JavaScript-Canvas-to-Blob
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*
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* Copyright 2012, Sebastian Tschan
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* https://blueimp.net
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*
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* Licensed under the MIT license:
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* http://www.opensource.org/licenses/MIT
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*
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* Based on stackoverflow user Stoive's code snippet:
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* http://stackoverflow.com/q/4998908
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*/
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/*jslint nomen: true, regexp: true */
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/*global window, atob, Blob, ArrayBuffer, Uint8Array, define */
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(function (window) {
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'use strict';
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var CanvasPrototype = window.HTMLCanvasElement &&
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window.HTMLCanvasElement.prototype,
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hasBlobConstructor = window.Blob && (function () {
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try {
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return Boolean(new Blob());
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} catch (e) {
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return false;
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}
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}()),
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hasArrayBufferViewSupport = hasBlobConstructor && window.Uint8Array &&
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(function () {
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try {
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return new Blob([new Uint8Array(100)]).size === 100;
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} catch (e) {
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return false;
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}
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}()),
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BlobBuilder = window.BlobBuilder || window.WebKitBlobBuilder ||
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window.MozBlobBuilder || window.MSBlobBuilder,
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dataURLtoBlob = (hasBlobConstructor || BlobBuilder) && window.atob &&
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window.ArrayBuffer && window.Uint8Array && function (dataURI) {
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var byteString,
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arrayBuffer,
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intArray,
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i,
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mimeString,
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bb;
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if (dataURI.split(',')[0].indexOf('base64') >= 0) {
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// Convert base64 to raw binary data held in a string:
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byteString = atob(dataURI.split(',')[1]);
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} else {
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// Convert base64/URLEncoded data component to raw binary data:
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byteString = decodeURIComponent(dataURI.split(',')[1]);
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}
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// Write the bytes of the string to an ArrayBuffer:
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arrayBuffer = new ArrayBuffer(byteString.length);
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intArray = new Uint8Array(arrayBuffer);
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for (i = 0; i < byteString.length; i += 1) {
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intArray[i] = byteString.charCodeAt(i);
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}
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// Separate out the mime component:
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mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0];
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// Write the ArrayBuffer (or ArrayBufferView) to a blob:
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if (hasBlobConstructor) {
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return new Blob(
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[hasArrayBufferViewSupport ? intArray : arrayBuffer],
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{type: mimeString}
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);
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}
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bb = new BlobBuilder();
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bb.append(arrayBuffer);
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return bb.getBlob(mimeString);
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};
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if (window.HTMLCanvasElement && !CanvasPrototype.toBlob) {
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if (CanvasPrototype.mozGetAsFile) {
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CanvasPrototype.toBlob = function (callback, type, quality) {
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if (quality && CanvasPrototype.toDataURL && dataURLtoBlob) {
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callback(dataURLtoBlob(this.toDataURL(type, quality)));
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} else {
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callback(this.mozGetAsFile('blob', type));
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}
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};
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} else if (CanvasPrototype.toDataURL && dataURLtoBlob) {
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CanvasPrototype.toBlob = function (callback, type, quality) {
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callback(dataURLtoBlob(this.toDataURL(type, quality)));
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};
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}
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}
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window.dataURLtoBlob = dataURLtoBlob;
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}(this));
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webshim.isReady('canvas-blob', true);
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