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test-render.js
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test-render.js
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var p5 = require('./p5');
var assert = require('assert');
var _ = window._; // lodash
var SVGCanvas = require('svgcanvas');
// init p5 canvas instance and p5-svg instance
var canvasGraphics, svgGraphics, p5svg, p5canvas;
p5svg = new p5(function(p) {
p.setup = function() {
svgGraphics = p.createCanvas(100, 100, p.SVG);
p.noLoop();
p.isSVG = true;
};
}, true);
p5canvas = new p5(function(p) {
p.setup = function() {
canvasGraphics = p.createCanvas(100, 100);
p.noLoop();
p.isSVG = false;
};
}, true);
var resetCanvas = function(p) {
p.clear();
p.strokeWeight(6); // for using XOR with thin line removed (using 8-connected neighborhood < 5) for diff
p.fill(200);
p.stroke(0);
p.ellipseMode(p.CENTER);
p.rectMode(p.CORNER);
p.smooth();
p.pixelDensity(3); // for 200% and 150%
};
// count non transparent pixels
var countPixels = function(imgData) {
var count = 0;
for (var i = 3; i < imgData.data.length; i += 4) {
if (imgData.data[i] > 0) {
count++;
}
}
return count;
};
var maxPixelDiff = 0;
var diffPixels = function(imgData1, imgData2, diffImgData) {
for (var i = 0; i < imgData1.data.length; i += 4) {
var indexes = [i, i+1, i+2, i+3];
indexes.forEach(function(i) {
diffImgData.data[i] = 0;
});
if(indexes.some(function(i) {
return Math.abs(imgData1.data[i] - imgData2.data[i]) > maxPixelDiff;
})) {
diffImgData.data[i+3] = 255; // set black
}
}
};
// remove thin lines using 8-connected neighborhood < 5
var removeThinLines = function(canvas) {
var ctx = canvas.getContext('2d');
var width = canvas.width;
var height = canvas.height;
var imgData = ctx.getImageData(0, 0, canvas.width, canvas.height);
var imgDataCopy = ctx.getImageData(0, 0, canvas.width, canvas.height);
var getPixelIndex = function(x, y) {
return (y * width + x) * 4 + 3;
};
var getPixel = function(x, y) {
var alphaIndex = getPixelIndex(x, y);
return imgDataCopy.data[alphaIndex];
};
var setPixel = function(x, y, value) {
imgData.data[getPixelIndex(x, y)] = value;
};
for (var x = 1; x < width - 1; x++) {
for (var y = 1; y < height - 1; y++) {
if (getPixel(x, y) == 0) {
continue; // ignore transparents
}
var links = [
{x: x - 1, y: y - 1},
{x: x, y: y - 1},
{x: x + 1, y: y - 1},
{x: x - 1, y: y},
{x: x + 1, y: y},
{x: x - 1, y: y + 1},
{x: x, y: y + 1},
{x: x + 1, y: y + 1}
].map(function(p) {
return getPixel(p.x, p.y);
}).filter(function(val) {
return val > 0; // not transparent?
}).length;
if (links < 5) { // is a thin line
setPixel(x, y, 0); // make it transparent
}
}
}
canvas.getContext('2d').putImageData(imgData, 0, 0);
};
// render given function
var render = function(draw) {
var fnbody = draw.toString();
fnbody = fnbody.substring(fnbody.indexOf('{') + 1, fnbody.lastIndexOf('}'));
[p5svg, p5canvas].forEach(function(p) {
resetCanvas(p);
with (p) {
p.canvas.getContext('2d').__history = [];
eval(fnbody);
}
});
};
// prepare dom for tests container
var prepareDom = function(draw) {
var $container = $('#test-graph');
var status = {};
// draw header
var th = '<div class="th"><div>Rendered in SVG</div><div>Rendered in Canvas<br>Converted to PNG</div><div>Diff Bitmap</div><div>Diff Bitmap with thin line removed (8-connected neighborhood < 5)</div><div></div><div class="function">p5.js</div></div>';
$container.append(th);
// the svg result
var svg = new Image();
svg.onload = function() {
status.svg = true;
};
svg.src = SVGCanvas.prototype.toDataURL.call({svg: p5svg._renderer.svg},
"image/svg+xml");
var _svg = p5svg._renderer.svg.cloneNode(true);
_svg.id = null;
_svg.className = 'svg';
$container.append(_svg);
// the canvas result
var canvas = new Image();
canvas.onload = function() {
status.canvas = true;
};
canvas.src = p5canvas._curElement.elt.toDataURL('image/png');
$container.append(canvas);
// diff canvas
var diffCanvas = document.createElement('canvas');
diffCanvas.width = 100 * window.devicePixelRatio;
diffCanvas.height = 100 * window.devicePixelRatio;;
$container.append(diffCanvas);
// diff canvas2 for removing thin lines
var diffCanvas2 = document.createElement('canvas');
diffCanvas2.width = 100 * window.devicePixelRatio;;
diffCanvas2.height = 100 * window.devicePixelRatio;;
$container.append(diffCanvas2);
// match?
var $match = $('<div class="match"></div>');
$container.append($match);
// p5.js API call history
var fnbody = draw.toString();
fnbody = fnbody.substring(fnbody.indexOf('{') + 1, fnbody.lastIndexOf('}'));
// re-indent
var indent = fnbody.match(/( +)/)[0].length;
indent = new RegExp('^[ ]{' + indent + '}', 'gm');
fnbody = fnbody.replace(indent, '');
$container.append('<pre class="function">' + fnbody + '</pre>');
// canvas API call history
// var history = p5svg.canvas.getContext('2d').__history;
// $container.append('<div class="canvas-fn">' + history.join('<br>') + '</div>');
$container.append('<hr>');
return {
svg: svg,
canvas: canvas,
diffCanvas: diffCanvas,
diffCanvas2: diffCanvas2,
$match: $match,
isReady: function() {
return status.svg && status.canvas;
}
};
};
var testRender = function(draw, callback) {
testRender.setMaxDiff(0.05); // reset maxDiff
testRender.setMaxPixelDiff(0); // reset maxPixelDiff
render(draw);
var diff = function(el) {
// wait until ready
// if (!el.svg.complete || !el.canvas.complete) {
if (!el.isReady()) {
// 100 is workround for NS_ERROR_NOT_AVAILABLE in karma
setTimeout(function() {
diff(el);
}, 100);
return;
}
var ctx = el.diffCanvas.getContext('2d');
var w = 100 * window.devicePixelRatio;
var h = 100 * window.devicePixelRatio;
// svg render result
ctx.clearRect(0, 0, w, h);
ctx.drawImage(el.svg, 0, 0, w, h);
var imgData1 = ctx.getImageData(0, 0, w, h);
// canvas render result
ctx.clearRect(0, 0, w, h);
ctx.drawImage(el.canvas, 0, 0, w, h);
var imgData2 = ctx.getImageData(0, 0, w, h);
// get diff
var diffImgData = ctx.getImageData(0, 0, w, h);
diffPixels(imgData1, imgData2, diffImgData);
ctx.putImageData(diffImgData, 0, 0);
// get diff with thin line removed (8-connected neighborhood < 5)
ctx = el.diffCanvas2.getContext('2d');
ctx.putImageData(diffImgData, 0, 0);
removeThinLines(el.diffCanvas2);
removeThinLines(el.diffCanvas2); // twice
var diffImgData2 = ctx.getImageData(0, 0, w, h);
// match?
var count = Math.max(countPixels(imgData1), countPixels(imgData2));
var diffCount = countPixels(diffImgData2);
var rate = diffCount / count;
var match = rate <= (testRender.maxDiff || 0.05);
// update $match
var icon = match ? 'fa-check': 'fa-times';
el.$match.html('<i class="fa ' + icon + '"></i>');
var err = null;
if (!match) {
err = new Error(JSON.stringify({
maxPixelDiff: maxPixelDiff,
maxDiffRate: testRender.maxDiff,
pixels: count,
diffPixels: diffCount,
rate: rate
}));
}
// callback
callback(err);
};
var next = function() {
// handle testRender.wait(ms);
if (testRender.waitUntil && (Date.now() < testRender.waitUntil)) {
setTimeout(next, 100);
return;
}
var el = prepareDom(draw);
diff(el);
};
next();
};
testRender.describe = function(str) {
$(function() {
var $container = $('#test-graph');
$container.append('<h2>' + str + '</h2>');
});
};
testRender.setMaxDiff = function(max) {
testRender.maxDiff = max;
};
testRender.setMaxPixelDiff = function(max) {
maxPixelDiff = max;
};
testRender.wait = function(ms) {
testRender.waitUntil = Date.now() + ms;
};
// add lock so testRender will wait
testRender.lock = function() {
testRender.wait(1000 * 1000 * 1000);
};
// remove lock
testRender.unlock = function() {
testRender.wait(0);
};
module.exports = testRender;