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93 lines
2.8 KiB
JavaScript
93 lines
2.8 KiB
JavaScript
/*
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* JavaScript Canvas to Blob Test
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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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/* global describe, it, Blob */
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;(function (expect) {
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'use strict'
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// 80x60px GIF image (color black, base64 data):
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var b64Data = 'R0lGODdhUAA8AIABAAAAAP///ywAAAAAUAA8AAACS4SPqcvtD6' +
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'OctNqLs968+w+G4kiW5omm6sq27gvH8kzX9o3n+s73/g8MCofE' +
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'ovGITCqXzKbzCY1Kp9Sq9YrNarfcrvcLDovH5PKsAAA7'
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var imageUrl = 'data:image/gif;base64,' + b64Data
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var blob = window.dataURLtoBlob && window.dataURLtoBlob(imageUrl)
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describe('canvas.toBlob', function () {
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it('Converts a canvas element to a blob and passes it to the callback function', function (done) {
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window.loadImage(blob, function (canvas) {
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canvas.toBlob(
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function (newBlob) {
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expect(newBlob).to.be.a.instanceOf(Blob)
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done()
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}
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)
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}, {canvas: true})
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})
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it('Converts a canvas element to a PNG blob', function (done) {
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window.loadImage(blob, function (canvas) {
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canvas.toBlob(
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function (newBlob) {
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expect(newBlob.type).to.equal('image/png')
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done()
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},
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'image/png'
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)
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}, {canvas: true})
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})
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it('Converts a canvas element to a JPG blob', function (done) {
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window.loadImage(blob, function (canvas) {
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canvas.toBlob(
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function (newBlob) {
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expect(newBlob.type).to.equal('image/jpeg')
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done()
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},
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'image/jpeg'
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)
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}, {canvas: true})
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})
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it('Keeps the aspect ratio of the canvas image', function (done) {
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window.loadImage(blob, function (canvas) {
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canvas.toBlob(
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function (newBlob) {
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window.loadImage(newBlob, function (img) {
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expect(img.width).to.equal(canvas.width)
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expect(img.height).to.equal(canvas.height)
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done()
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})
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}
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)
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}, {canvas: true})
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})
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it('Keeps the image data of the canvas image', function (done) {
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window.loadImage(blob, function (canvas) {
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canvas.toBlob(
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function (newBlob) {
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window.loadImage(newBlob, function (newCanvas) {
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var canvasData = canvas.getContext('2d')
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.getImageData(0, 0, canvas.width, canvas.height)
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var newCanvasData = newCanvas.getContext('2d')
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.getImageData(0, 0, newCanvas.width, newCanvas.height)
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expect(canvasData.width).to.equal(newCanvasData.width)
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expect(canvasData.height).to.equal(newCanvasData.height)
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done()
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}, {canvas: true})
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}
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)
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}, {canvas: true})
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})
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})
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}(this.chai.expect))
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