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/*
* JavaScript Load Image Test
* https://github.com/blueimp/JavaScript-Load-Image
*
* Copyright 2011, Sebastian Tschan
* https://blueimp.net
*
* Licensed under the MIT license:
* https://opensource.org/licenses/MIT
*/
/* global describe, it, Blob */
/* eslint-disable no-unused-expressions */
;(function (expect, loadImage) {
'use strict'
var canCreateBlob = !!window.dataURLtoBlob
// 80x60px GIF image (color black, base64 data):
var b64DataGIF =
'R0lGODdhUAA8AIABAAAAAP///ywAAAAAUAA8AAACS4SPqcvtD6' +
'OctNqLs968+w+G4kiW5omm6sq27gvH8kzX9o3n+s73/g8MCofE' +
'ovGITCqXzKbzCY1Kp9Sq9YrNarfcrvcLDovH5PKsAAA7'
var imageUrlGIF = 'data:image/gif;base64,' + b64DataGIF
var blobGIF = canCreateBlob && window.dataURLtoBlob(imageUrlGIF)
// 2x1px JPEG (color white, with the Exif orientation flag set to 6):
var b64DataJPEG =
'/9j/4AAQSkZJRgABAQEAYABgAAD/4QAiRXhpZgAASUkqAAgAAA' +
'ABABIBAwABAAAABgASAAAAAAD/2wBDAAEBAQEBAQEBAQEBAQEB' +
'AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQ' +
'EBAQEBAQEBAQEBAQH/2wBDAQEBAQEBAQEBAQEBAQEBAQEBAQEB' +
'AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQ' +
'EBAQEBAQH/wAARCAABAAIDASIAAhEBAxEB/8QAHwAAAQUBAQEB' +
'AQEAAAAAAAAAAAECAwQFBgcICQoL/8QAtRAAAgEDAwIEAwUFBA' +
'QAAAF9AQIDAAQRBRIhMUEGE1FhByJxFDKBkaEII0KxwRVS0fAk' +
'M2JyggkKFhcYGRolJicoKSo0NTY3ODk6Q0RFRkdISUpTVFVWV1' +
'hZWmNkZWZnaGlqc3R1dnd4eXqDhIWGh4iJipKTlJWWl5iZmqKj' +
'pKWmp6ipqrKztLW2t7i5usLDxMXGx8jJytLT1NXW19jZ2uHi4+' +
'Tl5ufo6erx8vP09fb3+Pn6/8QAHwEAAwEBAQEBAQEBAQAAAAAA' +
'AAECAwQFBgcICQoL/8QAtREAAgECBAQDBAcFBAQAAQJ3AAECAx' +
'EEBSExBhJBUQdhcRMiMoEIFEKRobHBCSMzUvAVYnLRChYkNOEl' +
'8RcYGRomJygpKjU2Nzg5OkNERUZHSElKU1RVVldYWVpjZGVmZ2' +
'hpanN0dXZ3eHl6goOEhYaHiImKkpOUlZaXmJmaoqOkpaanqKmq' +
'srO0tba3uLm6wsPExcbHyMnK0tPU1dbX2Nna4uPk5ebn6Onq8v' +
'P09fb3+Pn6/9oADAMBAAIRAxEAPwD+/iiiigD/2Q=='
var imageUrlJPEG = 'data:image/jpeg;base64,' + b64DataJPEG
var blobJPEG = canCreateBlob && window.dataURLtoBlob(imageUrlJPEG)
function createBlob (data, type) {
try {
return new Blob([data], { type: type })
} catch (e) {
var BlobBuilder =
window.BlobBuilder ||
window.WebKitBlobBuilder ||
window.MozBlobBuilder ||
window.MSBlobBuilder
var builder = new BlobBuilder()
builder.append(data.buffer || data)
return builder.getBlob(type)
}
}
describe('Loading', function () {
it('Return the img element or FileReader object to allow aborting the image load', function () {
var img = loadImage(blobGIF, function () {})
expect(img).to.be.an.instanceOf(Object)
expect(img.onload).to.be.a('function')
expect(img.onerror).to.be.a('function')
})
it('Load image url', function (done) {
expect(
loadImage(imageUrlGIF, function (img) {
expect(img.width).to.equal(80)
expect(img.height).to.equal(60)
done()
})
).to.be.ok
})
it('Load image blob', function (done) {
expect(
loadImage(blobGIF, function (img) {
expect(img.width).to.equal(80)
expect(img.height).to.equal(60)
done()
})
).to.be.ok
})
it('Return image loading error to callback', function (done) {
expect(
loadImage('404', function (img) {
expect(img).to.be.an.instanceOf(window.Event)
expect(img.type).to.equal('error')
done()
})
).to.be.ok
})
it('Keep object URL if noRevoke is true', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
loadImage(img.src, function (img2) {
expect(img.width).to.equal(img2.width)
expect(img.height).to.equal(img2.height)
done()
})
},
{ noRevoke: true }
)
).to.be.ok
})
it('Discard object URL if noRevoke is undefined or false', function (done) {
expect(
loadImage(blobGIF, function (img) {
loadImage(img.src, function (img2) {
if (!window.callPhantom) {
// revokeObjectUrl doesn't seem to have an effect in PhantomJS
expect(img2).to.be.an.instanceOf(window.Event)
expect(img2.type).to.equal('error')
}
done()
})
})
).to.be.ok
})
})
describe('Scaling', function () {
describe('max/min', function () {
it('Scale to maxWidth', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(40)
expect(img.height).to.equal(30)
done()
},
{ maxWidth: 40 }
)
).to.be.ok
})
it('Scale to maxHeight', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(20)
expect(img.height).to.equal(15)
done()
},
{ maxHeight: 15 }
)
).to.be.ok
})
it('Scale to minWidth', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(160)
expect(img.height).to.equal(120)
done()
},
{ minWidth: 160 }
)
).to.be.ok
})
it('Scale to minHeight', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(320)
expect(img.height).to.equal(240)
done()
},
{ minHeight: 240 }
)
).to.be.ok
})
it('Scale to minWidth but respect maxWidth', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(160)
expect(img.height).to.equal(120)
done()
},
{ minWidth: 240, maxWidth: 160 }
)
).to.be.ok
})
it('Scale to minHeight but respect maxHeight', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(160)
expect(img.height).to.equal(120)
done()
},
{ minHeight: 180, maxHeight: 120 }
)
).to.be.ok
})
it('Scale to minWidth but respect maxHeight', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(160)
expect(img.height).to.equal(120)
done()
},
{ minWidth: 240, maxHeight: 120 }
)
).to.be.ok
})
it('Scale to minHeight but respect maxWidth', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(160)
expect(img.height).to.equal(120)
done()
},
{ minHeight: 180, maxWidth: 160 }
)
).to.be.ok
})
it('Scale up with the given pixelRatio', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(320)
expect(img.height).to.equal(240)
expect(img.style.width).to.equal('160px')
expect(img.style.height).to.equal('120px')
done()
},
{ minWidth: 160, canvas: true, pixelRatio: 2 }
)
).to.be.ok
})
it('Scale down with the given pixelRatio', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(80)
expect(img.height).to.equal(60)
expect(img.style.width).to.equal('40px')
expect(img.style.height).to.equal('30px')
done()
},
{ maxWidth: 40, canvas: true, pixelRatio: 2 }
)
).to.be.ok
})
it('Scale down with the given downsamplingRatio', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(20)
expect(img.height).to.equal(15)
done()
},
{ maxWidth: 20, canvas: true, downsamplingRatio: 0.5 }
)
).to.be.ok
})
it('Ignore max settings if image dimensions are smaller', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(80)
expect(img.height).to.equal(60)
done()
},
{ maxWidth: 160, maxHeight: 120 }
)
).to.be.ok
})
it('Ignore min settings if image dimensions are larger', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(80)
expect(img.height).to.equal(60)
done()
},
{ minWidth: 40, minHeight: 30 }
)
).to.be.ok
})
})
describe('contain', function () {
it('Scale up to contain image in max dimensions', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(160)
expect(img.height).to.equal(120)
done()
},
{ maxWidth: 160, maxHeight: 160, contain: true }
)
).to.be.ok
})
it('Scale down to contain image in max dimensions', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(40)
expect(img.height).to.equal(30)
done()
},
{ maxWidth: 40, maxHeight: 40, contain: true }
)
).to.be.ok
})
})
describe('cover', function () {
it('Scale up to cover max dimensions with image dimensions', function (
done
) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(160)
expect(img.height).to.equal(120)
done()
},
{ maxWidth: 120, maxHeight: 120, cover: true }
)
).to.be.ok
})
it('Scale down to cover max dimensions with image dimensions', function (
done
) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(40)
expect(img.height).to.equal(30)
done()
},
{ maxWidth: 30, maxHeight: 30, cover: true }
)
).to.be.ok
})
})
})
describe('Cropping', function () {
it('Crop to same values for maxWidth and maxHeight', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(40)
expect(img.height).to.equal(40)
done()
},
{ maxWidth: 40, maxHeight: 40, crop: true }
)
).to.be.ok
})
it('Crop to different values for maxWidth and maxHeight', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(40)
expect(img.height).to.equal(60)
done()
},
{ maxWidth: 40, maxHeight: 60, crop: true }
)
).to.be.ok
})
it('Crop using the given sourceWidth and sourceHeight dimensions', function (
done
) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(40)
expect(img.height).to.equal(40)
done()
},
{ sourceWidth: 40, sourceHeight: 40, crop: true }
)
).to.be.ok
})
it('Crop using the given left and top coordinates', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(40)
expect(img.height).to.equal(20)
done()
},
{ left: 40, top: 40, crop: true }
)
).to.be.ok
})
it('Crop using the given right and bottom coordinates', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(40)
expect(img.height).to.equal(20)
done()
},
{ right: 40, bottom: 40, crop: true }
)
).to.be.ok
})
it('Crop using the given 2:1 aspectRatio', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(80)
expect(img.height).to.equal(40)
done()
},
{ aspectRatio: 2 }
)
).to.be.ok
})
it('Crop using the given 2:3 aspectRatio', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(40)
expect(img.height).to.equal(60)
done()
},
{ aspectRatio: 2 / 3 }
)
).to.be.ok
})
it('Crop using maxWidth/maxHeight with the given pixelRatio', function (
done
) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(80)
expect(img.height).to.equal(80)
expect(img.style.width).to.equal('40px')
expect(img.style.height).to.equal('40px')
done()
},
{ maxWidth: 40, maxHeight: 40, crop: true, pixelRatio: 2 }
)
).to.be.ok
})
it('Crop using sourceWidth/sourceHeight with the given pixelRatio', function (
done
) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(80)
expect(img.height).to.equal(80)
expect(img.style.width).to.equal('40px')
expect(img.style.height).to.equal('40px')
done()
},
{ sourceWidth: 40, sourceHeight: 40, crop: true, pixelRatio: 2 }
)
).to.be.ok
})
it('Crop using maxWidth/maxHeight with the given downsamplingRatio', function (
done
) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(10)
expect(img.height).to.equal(10)
var data = img.getContext('2d').getImageData(0, 0, 10, 10).data
for (var i = 0; i < data.length / 4; i += 4) {
expect(data[i]).to.equal(0)
expect(data[i + 1]).to.equal(0)
expect(data[i + 2]).to.equal(0)
expect(data[i + 3]).to.equal(255)
}
done()
},
{ maxWidth: 10, maxHeight: 10, crop: true, downsamplingRatio: 0.5 }
)
).to.be.ok
})
})
describe('Orientation', function () {
it('Should keep the orientation', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(80)
expect(img.height).to.equal(60)
done()
},
{ orientation: 1 }
)
).to.be.ok
})
it('Should rotate left', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(60)
expect(img.height).to.equal(80)
done()
},
{ orientation: 8 }
)
).to.be.ok
})
it('Should rotate right', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(60)
expect(img.height).to.equal(80)
done()
},
{ orientation: 6 }
)
).to.be.ok
})
it('Should adjust constraints to new coordinates', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(30)
expect(img.height).to.equal(40)
done()
},
{ orientation: 6, maxWidth: 30, maxHeight: 40 }
)
).to.be.ok
})
it('Should adjust left and top to new coordinates', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(30)
expect(img.height).to.equal(60)
done()
},
{ orientation: 5, left: 30, top: 20 }
)
).to.be.ok
})
it('Should adjust right and bottom to new coordinates', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(30)
expect(img.height).to.equal(60)
done()
},
{ orientation: 5, right: 30, bottom: 20 }
)
).to.be.ok
})
it('Should adjust left and bottom to new coordinates', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(30)
expect(img.height).to.equal(60)
done()
},
{ orientation: 7, left: 30, bottom: 20 }
)
).to.be.ok
})
it('Should adjust right and top to new coordinates', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(30)
expect(img.height).to.equal(60)
done()
},
{ orientation: 7, right: 30, top: 20 }
)
).to.be.ok
})
it('Should rotate left with the given pixelRatio', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(120)
expect(img.height).to.equal(160)
expect(img.style.width).to.equal('60px')
expect(img.style.height).to.equal('80px')
done()
},
{ orientation: 8, pixelRatio: 2 }
)
).to.be.ok
})
it('Should rotate right with the given pixelRatio', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(120)
expect(img.height).to.equal(160)
expect(img.style.width).to.equal('60px')
expect(img.style.height).to.equal('80px')
done()
},
{ orientation: 6, pixelRatio: 2 }
)
).to.be.ok
})
it('Should ignore too small orientation value', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(80)
expect(img.height).to.equal(60)
done()
},
{ orientation: -1 }
)
).to.be.ok
})
it('Should ignore too large orientation value', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.width).to.equal(80)
expect(img.height).to.equal(60)
done()
},
{ orientation: 9 }
)
).to.be.ok
})
it('Should rotate right based on the exif orientation value', function (
done
) {
expect(
loadImage(
blobJPEG,
function (img, data) {
expect(data).to.be.ok
expect(data.exif).to.be.ok
expect(data.exif.get('Orientation')).to.equal(6)
expect(img.width).to.equal(1)
expect(img.height).to.equal(2)
done()
},
{ orientation: true }
)
).to.be.ok
})
it('Should adjust constraints based on the exif orientation value', function (
done
) {
expect(
loadImage(
blobJPEG,
function (img) {
expect(img.width).to.equal(10)
expect(img.height).to.equal(20)
done()
},
{ orientation: true, minWidth: 10, minHeight: 20 }
)
).to.be.ok
})
})
describe('Canvas', function () {
it('Return img element to callback if canvas is not true', function (done) {
expect(
loadImage(blobGIF, function (img) {
expect(img.getContext).to.be.falsy
expect(img.nodeName.toLowerCase()).to.equal('img')
done()
})
).to.be.ok
})
it('Return canvas element to callback if canvas is true', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.getContext).to.be.ok
expect(img.nodeName.toLowerCase()).to.equal('canvas')
done()
},
{ canvas: true }
)
).to.be.ok
})
it('Return scaled canvas element to callback', function (done) {
expect(
loadImage(
blobGIF,
function (img) {
expect(img.getContext).to.be.ok
expect(img.nodeName.toLowerCase()).to.equal('canvas')
expect(img.width).to.equal(40)
expect(img.height).to.equal(30)
done()
},
{ canvas: true, maxWidth: 40 }
)
).to.be.ok
})
it('Accept a canvas element as parameter for loadImage.scale', function (
done
) {
expect(
loadImage(
blobGIF,
function (img) {
img = loadImage.scale(img, {
maxWidth: 40
})
expect(img.getContext).to.be.ok
expect(img.nodeName.toLowerCase()).to.equal('canvas')
expect(img.width).to.equal(40)
expect(img.height).to.equal(30)
done()
},
{ canvas: true }
)
).to.be.ok
})
})
describe('Metadata', function () {
it('Should parse Exif information', function (done) {
loadImage.parseMetaData(blobJPEG, function (data) {
expect(data.exif).to.be.ok
expect(data.exif.get('Orientation')).to.equal(6)
done()
})
})
it('Should parse the complete image head', function (done) {
loadImage.parseMetaData(blobJPEG, function (data) {
expect(data.imageHead).to.be.ok
loadImage.parseMetaData(
createBlob(data.imageHead, 'image/jpeg'),
function (data) {
expect(data.exif).to.be.ok
expect(data.exif.get('Orientation')).to.equal(6)
done()
}
)
})
})
it('Should parse meta data automatically', function (done) {
expect(
loadImage(
blobJPEG,
function (img, data) {
expect(data).to.be.ok
expect(data.imageHead).to.be.ok
expect(data.exif).to.be.ok
expect(data.exif.get('Orientation')).to.equal(6)
done()
},
{ meta: true }
)
).to.be.ok
})
})
if ('fetch' in window && 'Request' in window) {
describe('Fetch', function () {
it('Should fetch blob from URL if meta is true', function (done) {
expect(
loadImage(
imageUrlJPEG,
function (img, data) {
expect(data).to.be.ok
expect(data.imageHead).to.be.ok
expect(data.exif).to.be.ok
expect(data.exif.get('Orientation')).to.equal(6)
done()
},
{ meta: true }
)
).to.be.ok
})
it('Should not fetch blob from URL if meta is false', function (done) {
expect(
loadImage(imageUrlJPEG, function (img, data) {
expect(data.imageHead).to.be.falsy
expect(data.exif).to.be.falsy
expect(img.width).to.equal(2)
expect(img.height).to.equal(1)
done()
})
).to.be.ok
})
})
}
})(this.chai.expect, this.loadImage)