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canvas.test.js
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/* eslint-env mocha */
'use strict'
/**
* Module dependencies.
*/
const createCanvas = require('../').createCanvas
const createImageData = require('../').createImageData
const loadImage = require('../').loadImage
const parseFont = require('../').parseFont
const registerFont = require('../').registerFont
const pangoVersion = require('../').pangoVersion
const assert = require('assert')
const os = require('os')
const Readable = require('stream').Readable
const semver = require('semver')
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 Canvas = require('../').Canvas;
var c = new Canvas(10, 10);
assert.throws(function () { Canvas.prototype.width; }, /incompatible receiver/);
assert(!c.hasOwnProperty('width'));
assert('width' in c);
assert(Canvas.prototype.hasOwnProperty('width'));
});
it('.parseFont()', function () {
var 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 (var i = 0, len = tests.length; i < len; ++i) {
var str = tests[i++]
, expected = tests[i]
, 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'})
});
it('color serialization', function () {
var canvas = createCanvas(200, 200)
, 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 ('shadowColor' == prop) return;
var grad = ctx.createLinearGradient(0,0,0,150);
ctx[prop] = grad;
assert.strictEqual(grad, ctx[prop], prop + ' pattern getter failed');
});
});
it('color parser', function () {
var canvas = createCanvas(200, 200)
, 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);
// 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 () {
var canvas = createCanvas(10, 10);
assert.equal(canvas.type, 'image');
var canvas = createCanvas(10, 10, 'pdf');
assert.equal(canvas.type, 'pdf');
var canvas = createCanvas(10, 10, 'svg');
assert.equal(canvas.type, 'svg');
var canvas = createCanvas(10, 10, 'hey');
assert.equal(canvas.type, 'image');
});
it('Canvas#getContext("2d")', function () {
var canvas = createCanvas(200, 300)
, ctx = canvas.getContext('2d');
assert.ok('object' == typeof ctx);
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 => {
var width = params[0];
var height = params[1];
var errorLevel = params[2];
var level = 3;
try {
var canvas = createCanvas(width, height);
level--;
var 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 () {
var 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 () {
var 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 = .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(`${__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() {
var 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 () {
var canvas = createCanvas(200, 200)
, 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 () {
var canvas = createCanvas(200, 200)
, 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#font=small-caps', function () {
if (!semver.satisfies(pangoVersion, '>=1.37.1')){
this.skip();
}
registerFont('./examples/crimsonFont/Crimson-Bold.ttf', {family: 'Crimson'})
let canvas = createCanvas(200, 200),
ctx = canvas.getContext('2d');
// here is where the dot will appear above a lower-case 'i' (and be missing for small-caps)
let offsetX = 15, offsetY = -115;
ctx.font = "180px Crimson";
ctx.fillText('i', 20, 180);
let lcDottedI = ctx.getImageData(20 + offsetX, 180 + offsetY, 20, 20).data;
assert.equal(lcDottedI.some(p => p > 0), true);
ctx.save()
ctx.font = "small-caps 180px Crimson";
ctx.fillText('i', 80, 180);
let scEmptySpace = ctx.getImageData(80 + offsetX, 180 + offsetY, 20, 20).data;
assert.equal(scEmptySpace.every(p => p == 0), true);
ctx.restore()
ctx.fillText('i', 140, 180);
let lcDottedAgain = ctx.getImageData(140 + offsetX, 180 + offsetY, 20, 20).data;
assert.equal(lcDottedAgain.some(p => p > 0), true);
});
it('Context2d#lineWidth=', function () {
var canvas = createCanvas(200, 200)
, 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 () {
var canvas = createCanvas(200, 200)
, 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 () {
var canvas = createCanvas(200, 200)
, ctx = canvas.getContext('2d');
assert.equal('butt', ctx.lineCap);
ctx.lineCap = 'round';
assert.equal('round', ctx.lineCap);
});
it('Context2d#lineJoin=', function () {
var canvas = createCanvas(200, 200)
, ctx = canvas.getContext('2d');
assert.equal('miter', ctx.lineJoin);
ctx.lineJoin = 'round';
assert.equal('round', ctx.lineJoin);
});
it('Context2d#globalAlpha=', function () {
var canvas = createCanvas(200, 200)
, ctx = canvas.getContext('2d');
assert.equal(1, ctx.globalAlpha);
ctx.globalAlpha = 0.5
assert.equal(0.5, ctx.globalAlpha);
});
it('Context2d#isPointInPath()', function () {
var canvas = createCanvas(200, 200)
, 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 () {
var canvas = createCanvas(200,200)
, ctx = canvas.getContext('2d');
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);
});
it('Context2d#textTracking', function () {
var canvas = createCanvas(200,200)
, ctx = canvas.getContext('2d')
, measureWidth = () => ctx.measureText('MMMMMMMMMMMMM').width;
let normalWidth = measureWidth();
assert.equal(0, ctx.textTracking);
ctx.save();
ctx.textTracking = -500;
assert.equal(-500, ctx.textTracking);
assert.ok(measureWidth() < normalWidth / 2 );
ctx.textTracking = 1000;
assert.equal(1000, ctx.textTracking);
assert.ok(measureWidth() > normalWidth * 2 );
ctx.restore();
assert.equal(0, ctx.textTracking);
assert.equal(measureWidth(), normalWidth );
});
describe('#toBuffer', function () {
it('Canvas#toBuffer()', function () {
var buf = createCanvas(200,200).toBuffer();
assert.equal('PNG', buf.slice(1,4).toString());
});
it('Canvas#toBuffer("image/png")', function () {
var 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 () {
var buf = createCanvas(200,200).toBuffer('image/png', {compressionLevel: 5});
assert.equal('PNG', buf.slice(1,4).toString());
});
it('Canvas#toBuffer("image/jpeg")', function () {
var 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 () {
var 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() {
var canvas = createCanvas(11, 10)
, 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--
*/
var buf = canvas.toBuffer('raw');
var stride = canvas.stride;
var endianness = os.endianness();
function assertPixel(u32, x, y, message) {
var expected = '0x' + u32.toString(16);
// Buffer doesn't have readUInt32(): it only has readUInt32LE() and
// readUInt32BE().
var px = buf['readUInt32' + endianness](y * stride + x * 4);
var 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 () {
var canvas = createCanvas(200, 200)
, 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(0 === str.indexOf('data:image/png;base64,'));
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('data:,' === str);
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(0 === str.indexOf('data:image/png;base64,'));
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(0 === str.indexOf('data:image/png;base64,'));
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(0 === str.indexOf('data:image/png;base64,'));
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(0 === str.indexOf('data:image/png;base64,'));
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(0 === str.indexOf('data:image/jpeg;base64,'));
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(0 === str.indexOf('data:image/jpeg;base64,'));
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(0 === str.indexOf('data:image/jpeg;base64,'));
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(0 === str.indexOf('data:image/jpeg;base64,'));
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(0 === str.indexOf('data:image/jpeg;base64,'));
done();
});
});
});
describe('Context2d#createImageData(width, height)', function () {
it("works", function () {
var canvas = createCanvas(20, 20)
, ctx = canvas.getContext('2d');
var 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 () {
var canvas = createCanvas(20, 20)
, ctx = canvas.getContext('2d', {pixelFormat: "A8"});
var 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 () {
var canvas = createCanvas(20, 20)
, ctx = canvas.getContext('2d', {pixelFormat: "A1"});
var 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 () {
var canvas = createCanvas(20, 20)
, ctx = canvas.getContext('2d', {pixelFormat: "RGB24"});
var 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 () {
var canvas = createCanvas(20, 20)
, ctx = canvas.getContext('2d', {pixelFormat: "RGB16_565"});
var 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 () {
var canvas = createCanvas(20, 20)
, 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 () {
var canvas = createCanvas(20, 20)
var ctx = canvas.getContext('2d')
ctx.font = "20px Arial"
ctx.textBaseline = "alphabetic"
var metrics = ctx.measureText("Alphabet")
// Zero if the given baseline is the alphabetic baseline
assert.equal(metrics.alphabeticBaseline, 0)
// Positive = going up from the baseline
assert.ok(metrics.actualBoundingBoxAscent > 0)
// Positive = going down from the baseline