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canvas.test.js
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canvas.test.js
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/* eslint-env mocha */
'use strict'
/**
* Module dependencies.
*/
const assert = require('assert')
const os = require('os')
const path = require('path')
const { Readable } = require('stream')
const {
createCanvas,
createImageData,
loadImage,
parseFont,
registerFont,
Canvas,
deregisterAllFonts
} = require('../')
function assertApprox(actual, expected, tol) {
assert(Math.abs(expected - actual) <= tol,
"Expected " + actual + " to be " + expected + " +/- " + tol);
}
describe('Canvas', function () {
// Run with --expose-gc and uncomment this line to help find memory problems:
// afterEach(gc);
it('Prototype and ctor are well-shaped, don\'t hit asserts on accessors (GH-803)', function () {
const c = new Canvas(10, 10)
assert.throws(function () { Canvas.prototype.width }, /incompatible receiver/)
assert(!c.hasOwnProperty('width'))
assert('width' in c)
assert('width' in Canvas.prototype)
})
it('.parseFont()', function () {
const tests = [
'20px Arial',
{ size: 20, unit: 'px', family: 'Arial' },
'20pt Arial',
{ size: 26.666666666666668, unit: 'pt', family: 'Arial' },
'20.5pt Arial',
{ size: 27.333333333333332, unit: 'pt', family: 'Arial' },
'20% Arial',
{ size: 20, unit: '%', family: 'Arial' }, // TODO I think this is a bad assertion - ZB 23-Jul-2017
'20mm Arial',
{ size: 75.59055118110237, unit: 'mm', family: 'Arial' },
'20px serif',
{ size: 20, unit: 'px', family: 'serif' },
'20px sans-serif',
{ size: 20, unit: 'px', family: 'sans-serif' },
'20px monospace',
{ size: 20, unit: 'px', family: 'monospace' },
'50px Arial, sans-serif',
{ size: 50, unit: 'px', family: 'Arial,sans-serif' },
'bold italic 50px Arial, sans-serif',
{ style: 'italic', weight: 'bold', size: 50, unit: 'px', family: 'Arial,sans-serif' },
'50px Helvetica , Arial, sans-serif',
{ size: 50, unit: 'px', family: 'Helvetica,Arial,sans-serif' },
'50px "Helvetica Neue", sans-serif',
{ size: 50, unit: 'px', family: 'Helvetica Neue,sans-serif' },
'50px "Helvetica Neue", "foo bar baz" , sans-serif',
{ size: 50, unit: 'px', family: 'Helvetica Neue,foo bar baz,sans-serif' },
"50px 'Helvetica Neue'",
{ size: 50, unit: 'px', family: 'Helvetica Neue' },
'italic 20px Arial',
{ size: 20, unit: 'px', style: 'italic', family: 'Arial' },
'oblique 20px Arial',
{ size: 20, unit: 'px', style: 'oblique', family: 'Arial' },
'normal 20px Arial',
{ size: 20, unit: 'px', style: 'normal', family: 'Arial' },
'300 20px Arial',
{ size: 20, unit: 'px', weight: '300', family: 'Arial' },
'800 20px Arial',
{ size: 20, unit: 'px', weight: '800', family: 'Arial' },
'bolder 20px Arial',
{ size: 20, unit: 'px', weight: 'bolder', family: 'Arial' },
'lighter 20px Arial',
{ size: 20, unit: 'px', weight: 'lighter', family: 'Arial' },
'normal normal normal 16px Impact',
{ size: 16, unit: 'px', weight: 'normal', family: 'Impact', style: 'normal', variant: 'normal' },
'italic small-caps bolder 16px cursive',
{ size: 16, unit: 'px', style: 'italic', variant: 'small-caps', weight: 'bolder', family: 'cursive' },
'20px "new century schoolbook", serif',
{ size: 20, unit: 'px', family: 'new century schoolbook,serif' },
'20px "Arial bold 300"', // synthetic case with weight keyword inside family
{ size: 20, unit: 'px', family: 'Arial bold 300', variant: 'normal' }
]
for (let i = 0, len = tests.length; i < len; ++i) {
const str = tests[i++]
const expected = tests[i]
const actual = parseFont(str)
if (!expected.style) expected.style = 'normal'
if (!expected.weight) expected.weight = 'normal'
if (!expected.stretch) expected.stretch = 'normal'
if (!expected.variant) expected.variant = 'normal'
assert.deepEqual(actual, expected, 'Failed to parse: ' + str)
}
assert.strictEqual(parseFont('Helvetica, sans'), undefined)
})
it('registerFont', function () {
// Minimal test to make sure nothing is thrown
registerFont('./examples/pfennigFont/Pfennig.ttf', { family: 'Pfennig' })
registerFont('./examples/pfennigFont/PfennigBold.ttf', { family: 'Pfennig', weight: 'bold' })
// Test to multi byte file path support
registerFont('./examples/pfennigFont/pfennigMultiByte🚀.ttf', { family: 'Pfennig' })
deregisterAllFonts()
});
it('color serialization', function () {
const canvas = createCanvas(200, 200)
const ctx = canvas.getContext('2d');
['fillStyle', 'strokeStyle', 'shadowColor'].forEach(function (prop) {
ctx[prop] = '#FFFFFF'
assert.equal('#ffffff', ctx[prop], prop + ' #FFFFFF -> #ffffff, got ' + ctx[prop])
ctx[prop] = '#FFF'
assert.equal('#ffffff', ctx[prop], prop + ' #FFF -> #ffffff, got ' + ctx[prop])
ctx[prop] = 'rgba(128, 200, 128, 1)'
assert.equal('#80c880', ctx[prop], prop + ' rgba(128, 200, 128, 1) -> #80c880, got ' + ctx[prop])
ctx[prop] = 'rgba(128,80,0,0.5)'
assert.equal('rgba(128, 80, 0, 0.50)', ctx[prop], prop + ' rgba(128,80,0,0.5) -> rgba(128, 80, 0, 0.5), got ' + ctx[prop])
ctx[prop] = 'rgba(128,80,0,0.75)'
assert.equal('rgba(128, 80, 0, 0.75)', ctx[prop], prop + ' rgba(128,80,0,0.75) -> rgba(128, 80, 0, 0.75), got ' + ctx[prop])
if (prop === 'shadowColor') return
const grad = ctx.createLinearGradient(0, 0, 0, 150)
ctx[prop] = grad
assert.strictEqual(grad, ctx[prop], prop + ' pattern getter failed')
})
})
it('color parser', function () {
const canvas = createCanvas(200, 200)
const ctx = canvas.getContext('2d')
ctx.fillStyle = '#ffccaa'
assert.equal('#ffccaa', ctx.fillStyle)
ctx.fillStyle = '#FFCCAA'
assert.equal('#ffccaa', ctx.fillStyle)
ctx.fillStyle = '#FCA'
assert.equal('#ffccaa', ctx.fillStyle)
ctx.fillStyle = '#fff'
ctx.fillStyle = '#FGG'
assert.equal('#ff0000', ctx.fillStyle)
ctx.fillStyle = '#fff'
ctx.fillStyle = 'afasdfasdf'
assert.equal('#ffffff', ctx.fillStyle)
// #rgba and #rrggbbaa
ctx.fillStyle = '#ffccaa80'
assert.equal('rgba(255, 204, 170, 0.50)', ctx.fillStyle)
ctx.fillStyle = '#acf8'
assert.equal('rgba(170, 204, 255, 0.53)', ctx.fillStyle)
ctx.fillStyle = '#BEAD'
assert.equal('rgba(187, 238, 170, 0.87)', ctx.fillStyle)
ctx.fillStyle = 'rgb(255,255,255)'
assert.equal('#ffffff', ctx.fillStyle)
ctx.fillStyle = 'rgb(0,0,0)'
assert.equal('#000000', ctx.fillStyle)
ctx.fillStyle = 'rgb( 0 , 0 , 0)'
assert.equal('#000000', ctx.fillStyle)
ctx.fillStyle = 'rgba( 0 , 0 , 0, 1)'
assert.equal('#000000', ctx.fillStyle)
ctx.fillStyle = 'rgba( 255, 200, 90, 0.5)'
assert.equal('rgba(255, 200, 90, 0.50)', ctx.fillStyle)
ctx.fillStyle = 'rgba( 255, 200, 90, 0.75)'
assert.equal('rgba(255, 200, 90, 0.75)', ctx.fillStyle)
ctx.fillStyle = 'rgba( 255, 200, 90, 0.7555)'
assert.equal('rgba(255, 200, 90, 0.75)', ctx.fillStyle)
ctx.fillStyle = 'rgba( 255, 200, 90, .7555)'
assert.equal('rgba(255, 200, 90, 0.75)', ctx.fillStyle)
ctx.fillStyle = 'rgb(0, 0, 9000)'
assert.equal('#0000ff', ctx.fillStyle)
ctx.fillStyle = 'rgba(0, 0, 0, 42.42)'
assert.equal('#000000', ctx.fillStyle)
ctx.fillStyle = 'rgba(255, 250, 255)';
assert.equal('#fffaff', ctx.fillStyle);
ctx.fillStyle = 'rgba(124, 58, 26, 0)';
assert.equal('rgba(124, 58, 26, 0.00)', ctx.fillStyle);
// hsl / hsla tests
ctx.fillStyle = 'hsl(0, 0%, 0%)'
assert.equal('#000000', ctx.fillStyle)
ctx.fillStyle = 'hsl(3600, -10%, -10%)'
assert.equal('#000000', ctx.fillStyle)
ctx.fillStyle = 'hsl(10, 100%, 42%)'
assert.equal('#d62400', ctx.fillStyle)
ctx.fillStyle = 'hsl(370, 120%, 42%)'
assert.equal('#d62400', ctx.fillStyle)
ctx.fillStyle = 'hsl(0, 100%, 100%)'
assert.equal('#ffffff', ctx.fillStyle)
ctx.fillStyle = 'hsl(0, 150%, 150%)'
assert.equal('#ffffff', ctx.fillStyle)
ctx.fillStyle = 'hsl(237, 76%, 25%)'
assert.equal('#0f1470', ctx.fillStyle)
ctx.fillStyle = 'hsl(240, 73%, 25%)'
assert.equal('#11116e', ctx.fillStyle)
ctx.fillStyle = 'hsl(262, 32%, 42%)'
assert.equal('#62498d', ctx.fillStyle)
ctx.fillStyle = 'hsla(0, 0%, 0%, 1)'
assert.equal('#000000', ctx.fillStyle)
ctx.fillStyle = 'hsla(0, 100%, 100%, 1)'
assert.equal('#ffffff', ctx.fillStyle)
ctx.fillStyle = 'hsla(120, 25%, 75%, 0.5)'
assert.equal('rgba(175, 207, 175, 0.50)', ctx.fillStyle)
ctx.fillStyle = 'hsla(240, 75%, 25%, 0.75)'
assert.equal('rgba(16, 16, 112, 0.75)', ctx.fillStyle)
ctx.fillStyle = 'hsla(172.0, 33.00000e0%, 42%, 1)'
assert.equal('#488e85', ctx.fillStyle)
ctx.fillStyle = 'hsl(124.5, 76.1%, 47.6%)'
assert.equal('#1dd62b', ctx.fillStyle)
ctx.fillStyle = 'hsl(1.24e2, 760e-1%, 4.7e1%)'
assert.equal('#1dd329', ctx.fillStyle)
// case-insensitive (#235)
ctx.fillStyle = 'sILveR'
assert.equal(ctx.fillStyle, '#c0c0c0')
})
it('Canvas#type', function () {
let canvas = createCanvas(10, 10)
assert.equal(canvas.type, 'image')
canvas = createCanvas(10, 10, 'pdf')
assert.equal(canvas.type, 'pdf')
canvas = createCanvas(10, 10, 'svg')
assert.equal(canvas.type, 'svg')
canvas = createCanvas(10, 10, 'hey')
assert.equal(canvas.type, 'image')
})
it('Canvas#getContext("2d")', function () {
const canvas = createCanvas(200, 300)
const ctx = canvas.getContext('2d')
assert.ok(typeof ctx === 'object')
assert.equal(canvas, ctx.canvas, 'context.canvas is not canvas')
assert.equal(ctx, canvas.context, 'canvas.context is not context')
const MAX_IMAGE_SIZE = 32767;
[
[0, 0, 1],
[1, 0, 1],
[MAX_IMAGE_SIZE, 0, 1],
[MAX_IMAGE_SIZE + 1, 0, 3],
[MAX_IMAGE_SIZE, MAX_IMAGE_SIZE, null],
[MAX_IMAGE_SIZE + 1, MAX_IMAGE_SIZE, 3],
[MAX_IMAGE_SIZE + 1, MAX_IMAGE_SIZE + 1, 3],
[Math.pow(2, 30), 0, 3],
[Math.pow(2, 30), 1, 3],
[Math.pow(2, 32), 0, 1],
[Math.pow(2, 32), 1, 1]
].forEach(params => {
const width = params[0]
const height = params[1]
const errorLevel = params[2]
let level = 3
try {
const canvas = createCanvas(width, height)
level--
const ctx = canvas.getContext('2d')
level--
ctx.getImageData(0, 0, 1, 1)
level--
} catch (err) {}
if (errorLevel !== null) { assert.strictEqual(level, errorLevel) }
})
})
it('Canvas#getContext("2d", {pixelFormat: string})', function () {
let canvas, context
// default:
canvas = createCanvas(10, 10)
context = canvas.getContext('2d', { pixelFormat: 'RGBA32' })
assert.equal(context.pixelFormat, 'RGBA32')
canvas = createCanvas(10, 10)
context = canvas.getContext('2d', { pixelFormat: 'RGBA32' })
assert.equal(context.pixelFormat, 'RGBA32')
canvas = createCanvas(10, 10)
context = canvas.getContext('2d', { pixelFormat: 'RGB24' })
assert.equal(context.pixelFormat, 'RGB24')
canvas = createCanvas(10, 10)
context = canvas.getContext('2d', { pixelFormat: 'A8' })
assert.equal(context.pixelFormat, 'A8')
canvas = createCanvas(10, 10)
context = canvas.getContext('2d', { pixelFormat: 'A1' })
assert.equal(context.pixelFormat, 'A1')
canvas = createCanvas(10, 10)
context = canvas.getContext('2d', { pixelFormat: 'RGB16_565' })
assert.equal(context.pixelFormat, 'RGB16_565')
// Not tested: RGB30
})
it('Canvas#getContext("2d", {alpha: boolean})', function () {
let canvas, context
canvas = createCanvas(10, 10)
context = canvas.getContext('2d', { alpha: true })
assert.equal(context.pixelFormat, 'RGBA32')
canvas = createCanvas(10, 10)
context = canvas.getContext('2d', { alpha: false })
assert.equal(context.pixelFormat, 'RGB24')
// alpha takes priority:
canvas = createCanvas(10, 10)
context = canvas.getContext('2d', { pixelFormat: 'RGBA32', alpha: false })
assert.equal(context.pixelFormat, 'RGB24')
})
it('Canvas#{width,height}=', function () {
const canvas = createCanvas(100, 200)
const context = canvas.getContext('2d')
assert.equal(canvas.width, 100)
assert.equal(canvas.height, 200)
context.globalAlpha = 0.5
context.fillStyle = '#0f0'
context.strokeStyle = '#0f0'
context.font = '20px arial'
context.fillRect(0, 0, 1, 1)
canvas.width = 50
canvas.height = 70
assert.equal(canvas.width, 50)
assert.equal(canvas.height, 70)
context.font = '20px arial'
assert.equal(context.font, '20px arial')
canvas.width |= 0
assert.equal(context.lineWidth, 1) // #1095
assert.equal(context.globalAlpha, 1) // #1292
assert.equal(context.fillStyle, '#000000')
assert.equal(context.strokeStyle, '#000000')
assert.equal(context.font, '10px sans-serif')
assert.strictEqual(context.getImageData(0, 0, 1, 1).data.join(','), '0,0,0,0')
})
it('Canvas#width= (resurfacing) doesn\'t crash when fillStyle is a pattern (#1357)', function (done) {
const canvas = createCanvas(100, 200)
const ctx = canvas.getContext('2d')
loadImage(path.join(__dirname, '/fixtures/checkers.png')).then(img => {
const pattern = ctx.createPattern(img, 'repeat')
ctx.fillStyle = pattern
ctx.fillRect(0, 0, 300, 300)
canvas.width = 200 // cause canvas to resurface
done()
})
})
it('SVG Canvas#width changes don\'t crash (#1380)', function () {
const myCanvas = createCanvas(100, 100, 'svg')
myCanvas.width = 120
})
it('Canvas#stride', function () {
const canvas = createCanvas(24, 10)
assert.ok(canvas.stride >= 24, 'canvas.stride is too short')
assert.ok(canvas.stride < 1024, 'canvas.stride seems too long')
// TODO test stride on other formats
})
it('Canvas#getContext("invalid")', function () {
assert.equal(null, createCanvas(200, 300).getContext('invalid'))
})
it('Context2d#patternQuality', function () {
const canvas = createCanvas(200, 200)
const ctx = canvas.getContext('2d')
assert.equal('good', ctx.patternQuality)
ctx.patternQuality = 'best'
assert.equal('best', ctx.patternQuality)
ctx.patternQuality = 'invalid'
assert.equal('best', ctx.patternQuality)
})
it('Context2d#imageSmoothingEnabled', function () {
const canvas = createCanvas(200, 200)
const ctx = canvas.getContext('2d')
assert.equal(true, ctx.imageSmoothingEnabled)
ctx.imageSmoothingEnabled = false
assert.equal('good', ctx.patternQuality)
assert.equal(false, ctx.imageSmoothingEnabled)
assert.equal('good', ctx.patternQuality)
})
it('Context2d#font=', function () {
const canvas = createCanvas(200, 200)
const ctx = canvas.getContext('2d')
assert.equal(ctx.font, '10px sans-serif')
ctx.font = '15px Arial, sans-serif'
assert.equal(ctx.font, '15px Arial, sans-serif')
ctx.font = 'Helvetica, sans' // invalid
assert.equal(ctx.font, '15px Arial, sans-serif')
})
it('Context2d#lineWidth=', function () {
const canvas = createCanvas(200, 200)
const ctx = canvas.getContext('2d')
ctx.lineWidth = 10.0
assert.equal(10, ctx.lineWidth)
ctx.lineWidth = Infinity
assert.equal(10, ctx.lineWidth)
ctx.lineWidth = -Infinity
assert.equal(10, ctx.lineWidth)
ctx.lineWidth = -5
assert.equal(10, ctx.lineWidth)
ctx.lineWidth = 0
assert.equal(10, ctx.lineWidth)
})
it('Context2d#antiAlias=', function () {
const canvas = createCanvas(200, 200)
const ctx = canvas.getContext('2d')
assert.equal('default', ctx.antialias)
ctx.antialias = 'none'
assert.equal('none', ctx.antialias)
ctx.antialias = 'gray'
assert.equal('gray', ctx.antialias)
ctx.antialias = 'subpixel'
assert.equal('subpixel', ctx.antialias)
ctx.antialias = 'invalid'
assert.equal('subpixel', ctx.antialias)
ctx.antialias = 1
assert.equal('subpixel', ctx.antialias)
})
it('Context2d#lineCap=', function () {
const canvas = createCanvas(200, 200)
const ctx = canvas.getContext('2d')
assert.equal('butt', ctx.lineCap)
ctx.lineCap = 'round'
assert.equal('round', ctx.lineCap)
})
it('Context2d#lineJoin=', function () {
const canvas = createCanvas(200, 200)
const ctx = canvas.getContext('2d')
assert.equal('miter', ctx.lineJoin)
ctx.lineJoin = 'round'
assert.equal('round', ctx.lineJoin)
})
it('Context2d#globalAlpha=', function () {
const canvas = createCanvas(200, 200)
const ctx = canvas.getContext('2d')
assert.equal(1, ctx.globalAlpha)
ctx.globalAlpha = 0.5
assert.equal(0.5, ctx.globalAlpha)
})
it('Context2d#isPointInPath()', function () {
const canvas = createCanvas(200, 200)
const ctx = canvas.getContext('2d')
ctx.rect(5, 5, 100, 100)
ctx.rect(50, 100, 10, 10)
assert.ok(ctx.isPointInPath(10, 10))
assert.ok(ctx.isPointInPath(10, 50))
assert.ok(ctx.isPointInPath(100, 100))
assert.ok(ctx.isPointInPath(105, 105))
assert.ok(!ctx.isPointInPath(106, 105))
assert.ok(!ctx.isPointInPath(150, 150))
assert.ok(ctx.isPointInPath(50, 110))
assert.ok(ctx.isPointInPath(60, 110))
assert.ok(!ctx.isPointInPath(70, 110))
assert.ok(!ctx.isPointInPath(50, 120))
})
it('Context2d#textAlign', function () {
const canvas = createCanvas(200, 200)
const ctx = canvas.getContext('2d')
assert.equal('left', ctx.textAlign) // default TODO wrong default
ctx.textAlign = 'start'
assert.equal('start', ctx.textAlign)
ctx.textAlign = 'center'
assert.equal('center', ctx.textAlign)
ctx.textAlign = 'right'
assert.equal('right', ctx.textAlign)
ctx.textAlign = 'end'
assert.equal('end', ctx.textAlign)
ctx.textAlign = 'fail'
assert.equal('end', ctx.textAlign)
})
describe('#toBuffer', function () {
it('Canvas#toBuffer()', function () {
const buf = createCanvas(200, 200).toBuffer()
assert.equal('PNG', buf.slice(1, 4).toString())
})
it('Canvas#toBuffer("image/png")', function () {
const buf = createCanvas(200, 200).toBuffer('image/png')
assert.equal('PNG', buf.slice(1, 4).toString())
})
it('Canvas#toBuffer("image/png", {resolution: 96})', function () {
const buf = createCanvas(200, 200).toBuffer('image/png', { resolution: 96 })
// 3780 ppm ~= 96 ppi
let foundpHYs = false
for (let i = 0; i < buf.length - 12; i++) {
if (buf[i] === 0x70 &&
buf[i + 1] === 0x48 &&
buf[i + 2] === 0x59 &&
buf[i + 3] === 0x73) { // pHYs
foundpHYs = true
assert.equal(buf[i + 4], 0)
assert.equal(buf[i + 5], 0)
assert.equal(buf[i + 6], 0x0e)
assert.equal(buf[i + 7], 0xc4) // x
assert.equal(buf[i + 8], 0)
assert.equal(buf[i + 9], 0)
assert.equal(buf[i + 10], 0x0e)
assert.equal(buf[i + 11], 0xc4) // y
}
}
assert.ok(foundpHYs, 'missing pHYs header')
})
it('Canvas#toBuffer("image/png", {compressionLevel: 5})', function () {
const buf = createCanvas(200, 200).toBuffer('image/png', { compressionLevel: 5 })
assert.equal('PNG', buf.slice(1, 4).toString())
})
it('Canvas#toBuffer("image/jpeg")', function () {
const buf = createCanvas(200, 200).toBuffer('image/jpeg')
assert.equal(buf[0], 0xff)
assert.equal(buf[1], 0xd8)
assert.equal(buf[buf.byteLength - 2], 0xff)
assert.equal(buf[buf.byteLength - 1], 0xd9)
})
it('Canvas#toBuffer("image/jpeg", {quality: 0.95})', function () {
const buf = createCanvas(200, 200).toBuffer('image/jpeg', { quality: 0.95 })
assert.equal(buf[0], 0xff)
assert.equal(buf[1], 0xd8)
assert.equal(buf[buf.byteLength - 2], 0xff)
assert.equal(buf[buf.byteLength - 1], 0xd9)
})
it('Canvas#toBuffer(callback)', function (done) {
createCanvas(200, 200).toBuffer(function (err, buf) {
assert.ok(!err)
assert.equal('PNG', buf.slice(1, 4).toString())
done()
})
})
it('Canvas#toBuffer(callback, "image/jpeg")', function (done) {
createCanvas(200, 200).toBuffer(function (err, buf) {
assert.ok(!err)
assert.equal(buf[0], 0xff)
assert.equal(buf[1], 0xd8)
assert.equal(buf[buf.byteLength - 2], 0xff)
assert.equal(buf[buf.byteLength - 1], 0xd9)
done()
}, 'image/jpeg')
})
it('Canvas#toBuffer(callback, "image/jpeg", {quality: 0.95})', function (done) {
createCanvas(200, 200).toBuffer(function (err, buf) {
assert.ok(!err)
assert.equal(buf[0], 0xff)
assert.equal(buf[1], 0xd8)
assert.equal(buf[buf.byteLength - 2], 0xff)
assert.equal(buf[buf.byteLength - 1], 0xd9)
done()
}, 'image/jpeg', { quality: 0.95 })
})
describe('#toBuffer("raw")', function () {
const canvas = createCanvas(11, 10)
const ctx = canvas.getContext('2d')
ctx.clearRect(0, 0, 11, 10)
ctx.fillStyle = 'rgba(200, 200, 200, 0.505)'
ctx.fillRect(0, 0, 5, 5)
ctx.fillStyle = 'red'
ctx.fillRect(5, 0, 5, 5)
ctx.fillStyle = '#00ff00'
ctx.fillRect(0, 5, 5, 5)
ctx.fillStyle = 'black'
ctx.fillRect(5, 5, 4, 5)
/** Output:
* *****RRRRR-
* *****RRRRR-
* *****RRRRR-
* *****RRRRR-
* *****RRRRR-
* GGGGGBBBB--
* GGGGGBBBB--
* GGGGGBBBB--
* GGGGGBBBB--
* GGGGGBBBB--
*/
const buf = canvas.toBuffer('raw')
const stride = canvas.stride
const endianness = os.endianness()
function assertPixel (u32, x, y, message) {
const expected = '0x' + u32.toString(16)
// Buffer doesn't have readUInt32(): it only has readUInt32LE() and
// readUInt32BE().
const px = buf['readUInt32' + endianness](y * stride + x * 4)
const actual = '0x' + px.toString(16)
assert.equal(actual, expected, message)
}
it('should have the correct size', function () {
assert.equal(buf.length, stride * 10)
})
it('does not premultiply alpha', function () {
assertPixel(0x80646464, 0, 0, 'first semitransparent pixel')
assertPixel(0x80646464, 4, 4, 'last semitransparent pixel')
})
it('draws red', function () {
assertPixel(0xffff0000, 5, 0, 'first red pixel')
assertPixel(0xffff0000, 9, 4, 'last red pixel')
})
it('draws green', function () {
assertPixel(0xff00ff00, 0, 5, 'first green pixel')
assertPixel(0xff00ff00, 4, 9, 'last green pixel')
})
it('draws black', function () {
assertPixel(0xff000000, 5, 5, 'first black pixel')
assertPixel(0xff000000, 8, 9, 'last black pixel')
})
it('leaves undrawn pixels black, transparent', function () {
assertPixel(0x0, 9, 5, 'first undrawn pixel')
assertPixel(0x0, 9, 9, 'last undrawn pixel')
})
it('is immutable', function () {
ctx.fillStyle = 'white'
ctx.fillRect(0, 0, 10, 10)
canvas.toBuffer('raw') // (side-effect: flushes canvas)
assertPixel(0xffff0000, 5, 0, 'first red pixel')
})
})
})
describe('#toDataURL()', function () {
const canvas = createCanvas(200, 200)
const ctx = canvas.getContext('2d')
ctx.fillRect(0, 0, 100, 100)
ctx.fillStyle = 'red'
ctx.fillRect(100, 0, 100, 100)
it('toDataURL() works and defaults to PNG', function () {
assert.ok(canvas.toDataURL().startsWith('data:image/png;base64,'))
})
it('toDataURL(0.5) works and defaults to PNG', function () {
assert.ok(canvas.toDataURL(0.5).startsWith('data:image/png;base64,'))
})
it('toDataURL(undefined) works and defaults to PNG', function () {
assert.ok(canvas.toDataURL(undefined).startsWith('data:image/png;base64,'))
})
it('toDataURL("image/png") works', function () {
assert.ok(canvas.toDataURL('image/png').startsWith('data:image/png;base64,'))
})
it('toDataURL("image/png", 0.5) works', function () {
assert.ok(canvas.toDataURL('image/png').startsWith('data:image/png;base64,'))
})
it('toDataURL("iMaGe/PNg") works', function () {
assert.ok(canvas.toDataURL('iMaGe/PNg').startsWith('data:image/png;base64,'))
})
it('toDataURL("image/jpeg") works', function () {
assert.ok(canvas.toDataURL('image/jpeg').startsWith('data:image/jpeg;base64,'))
})
it('toDataURL(function (err, str) {...}) works and defaults to PNG', function (done) {
createCanvas(200, 200).toDataURL(function (err, str) {
assert.ifError(err)
assert.ok(str.indexOf('data:image/png;base64,') === 0)
done()
})
})
it('toDataURL(function (err, str) {...}) is async even with no canvas data', function (done) {
createCanvas().toDataURL(function (err, str) {
assert.ifError(err)
assert.ok(str === 'data:,')
done()
})
})
it('toDataURL(0.5, function (err, str) {...}) works and defaults to PNG', function (done) {
createCanvas(200, 200).toDataURL(0.5, function (err, str) {
assert.ifError(err)
assert.ok(str.indexOf('data:image/png;base64,') === 0)
done()
})
})
it('toDataURL(undefined, function (err, str) {...}) works and defaults to PNG', function (done) {
createCanvas(200, 200).toDataURL(undefined, function (err, str) {
assert.ifError(err)
assert.ok(str.indexOf('data:image/png;base64,') === 0)
done()
})
})
it('toDataURL("image/png", function (err, str) {...}) works', function (done) {
createCanvas(200, 200).toDataURL('image/png', function (err, str) {
assert.ifError(err)
assert.ok(str.indexOf('data:image/png;base64,') === 0)
done()
})
})
it('toDataURL("image/png", 0.5, function (err, str) {...}) works', function (done) {
createCanvas(200, 200).toDataURL('image/png', 0.5, function (err, str) {
assert.ifError(err)
assert.ok(str.indexOf('data:image/png;base64,') === 0)
done()
})
})
it('toDataURL("image/png", {}) works', function () {
assert.ok(canvas.toDataURL('image/png', {}).startsWith('data:image/png;base64,'))
})
it('toDataURL("image/jpeg", {}) works', function () {
assert.ok(canvas.toDataURL('image/jpeg', {}).startsWith('data:image/jpeg;base64,'))
})
it('toDataURL("image/jpeg", function (err, str) {...}) works', function (done) {
createCanvas(200, 200).toDataURL('image/jpeg', function (err, str) {
assert.ifError(err)
assert.ok(str.indexOf('data:image/jpeg;base64,') === 0)
done()
})
})
it('toDataURL("iMAge/JPEG", function (err, str) {...}) works', function (done) {
createCanvas(200, 200).toDataURL('iMAge/JPEG', function (err, str) {
assert.ifError(err)
assert.ok(str.indexOf('data:image/jpeg;base64,') === 0)
done()
})
})
it('toDataURL("image/jpeg", undefined, function (err, str) {...}) works', function (done) {
createCanvas(200, 200).toDataURL('image/jpeg', undefined, function (err, str) {
assert.ifError(err)
assert.ok(str.indexOf('data:image/jpeg;base64,') === 0)
done()
})
})
it('toDataURL("image/jpeg", 0.5, function (err, str) {...}) works', function (done) {
createCanvas(200, 200).toDataURL('image/jpeg', 0.5, function (err, str) {
assert.ifError(err)
assert.ok(str.indexOf('data:image/jpeg;base64,') === 0)
done()
})
})
it('toDataURL("image/jpeg", opts, function (err, str) {...}) works', function (done) {
createCanvas(200, 200).toDataURL('image/jpeg', { quality: 100 }, function (err, str) {
assert.ifError(err)
assert.ok(str.indexOf('data:image/jpeg;base64,') === 0)
done()
})
})
})
describe('Context2d#createImageData(width, height)', function () {
it('works', function () {
const canvas = createCanvas(20, 20)
const ctx = canvas.getContext('2d')
const imageData = ctx.createImageData(2, 6)
assert.equal(2, imageData.width)
assert.equal(6, imageData.height)
assert.equal(2 * 6 * 4, imageData.data.length)
assert.equal(0, imageData.data[0])
assert.equal(0, imageData.data[1])
assert.equal(0, imageData.data[2])
assert.equal(0, imageData.data[3])
})
it('works, A8 format', function () {
const canvas = createCanvas(20, 20)
const ctx = canvas.getContext('2d', { pixelFormat: 'A8' })
const imageData = ctx.createImageData(2, 6)
assert.equal(2, imageData.width)
assert.equal(6, imageData.height)
assert.equal(2 * 6 * 1, imageData.data.length)
assert.equal(0, imageData.data[0])
assert.equal(0, imageData.data[1])
assert.equal(0, imageData.data[2])
assert.equal(0, imageData.data[3])
})
it('works, A1 format', function () {
const canvas = createCanvas(20, 20)
const ctx = canvas.getContext('2d', { pixelFormat: 'A1' })
const imageData = ctx.createImageData(2, 6)
assert.equal(2, imageData.width)
assert.equal(6, imageData.height)
assert.equal(Math.ceil(2 * 6 / 8), imageData.data.length)
assert.equal(0, imageData.data[0])
assert.equal(0, imageData.data[1])
})
it('works, RGB24 format', function () {
const canvas = createCanvas(20, 20)
const ctx = canvas.getContext('2d', { pixelFormat: 'RGB24' })
const imageData = ctx.createImageData(2, 6)
assert.equal(2, imageData.width)
assert.equal(6, imageData.height)
assert.equal(2 * 6 * 4, imageData.data.length)
assert.equal(0, imageData.data[0])
assert.equal(0, imageData.data[1])
assert.equal(0, imageData.data[2])
assert.equal(0, imageData.data[3])
})
it('works, RGB16_565 format', function () {
const canvas = createCanvas(20, 20)
const ctx = canvas.getContext('2d', { pixelFormat: 'RGB16_565' })
const imageData = ctx.createImageData(2, 6)
assert(imageData.data instanceof Uint16Array)
assert.equal(2, imageData.width)
assert.equal(6, imageData.height)
assert.equal(2 * 6, imageData.data.length)
assert.equal(0, imageData.data[0])
assert.equal(0, imageData.data[1])
})
})
describe('Context2d#measureText()', function () {
it('Context2d#measureText().width', function () {
const canvas = createCanvas(20, 20)
const ctx = canvas.getContext('2d')
assert.ok(ctx.measureText('foo').width)
assert.ok(ctx.measureText('foo').width !== ctx.measureText('foobar').width)
assert.ok(ctx.measureText('foo').width !== ctx.measureText(' foo').width)
})
it('works', function () {
const canvas = createCanvas(20, 20)
const ctx = canvas.getContext('2d')
ctx.font = '20px Arial'
ctx.textBaseline = 'alphabetic'
let metrics = ctx.measureText('Alphabet')
// Actual value depends on font library version. Have observed values
// between 0 and 0.769.
assertApprox(metrics.alphabeticBaseline, 0.5, 0.5)
// Positive = going up from the baseline
assert.ok(metrics.actualBoundingBoxAscent > 0)
// Positive = going down from the baseline
assertApprox(metrics.actualBoundingBoxDescent, 5, 2)
ctx.textBaseline = 'bottom'
metrics = ctx.measureText('Alphabet')
assert.strictEqual(ctx.textBaseline, 'bottom')
assertApprox(metrics.alphabeticBaseline, 5, 2)
assert.ok(metrics.actualBoundingBoxAscent > 0)
// On the baseline or slightly above
assert.ok(metrics.actualBoundingBoxDescent <= 0)
})
it('actualBoundingBox is correct for left, center and right alignment (#1909)', function () {
const canvas = createCanvas(0, 0)
const ctx = canvas.getContext('2d')
// positive actualBoundingBoxLeft indicates a distance going left from the
// given alignment point.
// positive actualBoundingBoxRight indicates a distance going right from
// the given alignment point.
ctx.textAlign = 'left'
const lm = ctx.measureText('aaaa')
assertApprox(lm.actualBoundingBoxLeft, -1, 6)
assertApprox(lm.actualBoundingBoxRight, 21, 6)
ctx.textAlign = 'center'
const cm = ctx.measureText('aaaa')
assertApprox(cm.actualBoundingBoxLeft, 9, 6)
assertApprox(cm.actualBoundingBoxRight, 11, 6)
ctx.textAlign = 'right'
const rm = ctx.measureText('aaaa')
assertApprox(rm.actualBoundingBoxLeft, 19, 6)
assertApprox(rm.actualBoundingBoxRight, 1, 6)
})
})