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