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<title>Kraken JavaScript Benchmark: Gaussian Blur</title>
<link rel="stylesheet" href="../kraken.css">
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<style> #display { border: 5px solid rgb(0,0,50);}</style>
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<h2>Kraken JavaScript Benchmark: Desaturate</h2>
<div id="results">
<p>This benchmark <a href="http://en.wikipedia.org/wiki/Colorfulness">desaturates</a> a photo using code from <a href="http://www.pixastic.com/">Pixastic</a>.</p>
<p><small>Photo courtesy <a href="http://www.flickr.com/photos/katclay/4296523922/in/photostream/">Kat Clay</a> from Flickr</small>.</p>
<img id="image" src="squid.png" width="400" height="267">
<canvas id="canvas" width="400" height="267"></canvas>
<script>
/*
* Pixastic Lib - Desaturation filter - v0.1.1
* Copyright (c) 2008 Jacob Seidelin, [email protected], http://blog.nihilogic.dk/
* License: [http://www.pixastic.com/lib/license.txt] (MPL 1.1)
*/
var Pixastic = {};
Pixastic.Actions = {};
Pixastic.Actions.desaturate = {
process : function(params) {
var useAverage = !!(params.options.average && params.options.average != "false");
var data = params.data;
var rect = params.options.rect;
var w = rect.width;
var h = rect.height;
var p = w*h;
var pix = p*4, pix1, pix2;
if (useAverage) {
while (p--)
data[pix-=4] = data[pix1=pix+1] = data[pix2=pix+2] = (data[pix]+data[pix1]+data[pix2])/3
} else {
while (p--)
data[pix-=4] = data[pix1=pix+1] = data[pix2=pix+2] = (data[pix]*0.3 + data[pix1]*0.59 + data[pix2]*0.11);
}
return true;
}
}
function desaturateTest() {
var results = document.getElementById('blur-result');
results.innerHTML = "Running test...";
window.setTimeout(function() {
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
var img = document.getElementById('image')
ctx.drawImage(img, 0, 0, img.width, img.height);
var imgData = ctx.getImageData(0, 0, canvas.width, canvas.height);
var width = imgData.width, height = imgData.height;
var data = imgData.data;
var len = data.length;
var startTime = (new Date()).getTime();
var params = {
options: {
rect: { width: width, height: height}
},
data: imgData.data
}
Pixastic.Actions.desaturate.process(params);
var finishTime = Date.now() - startTime;
for (var i = 0; i < data.length; i++) {
imgData.data[i] = data[i];
}
//imgData.data = data;
ctx.putImageData(imgData, 0, 0);
results.innerHTML = "Finished: " + finishTime + "ms";
}, 10);
}
</script>
<p><input type="button" value="Desaturate Test" onclick="desaturateTest();"> <span id="blur-result"></span></p>
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