topical media & game development
mobile-query-three-plugins-assets-vendor-pixastic-actions-blurfast.js / js
/*
* Pixastic Lib - Blur Fast - v0.1.1
* Copyright (c) 2008 Jacob Seidelin, jseidelin@nihilogic.dk, http://blog.nihilogic.dk/
* License: [http://www.pixastic.com/lib/license.txt]
*/
Pixastic.Actions.blurfast = {
process : function(params) {
var amount = parseFloat(params.options.amount)||0;
var clear = !!(params.options.clear && params.options.clear != "false");
amount = Math.max(0,Math.min(5,amount));
if (Pixastic.Client.hasCanvas()) {
var rect = params.options.rect;
var ctx = params.canvas.getContext("2d");
ctx.save();
ctx.beginPath();
ctx.rect(rect.left, rect.top, rect.width, rect.height);
ctx.clip();
var scale = 2;
var smallWidth = Math.round(params.width / scale);
var smallHeight = Math.round(params.height / scale);
var copy = document.createElement("canvas");
copy.width = smallWidth;
copy.height = smallHeight;
var clear = false;
var steps = Math.round(amount * 20);
var copyCtx = copy.getContext("2d");
for (var i=0;i<steps;i++) {
var scaledWidth = Math.max(1,Math.round(smallWidth - i));
var scaledHeight = Math.max(1,Math.round(smallHeight - i));
copyCtx.clearRect(0,0,smallWidth,smallHeight);
copyCtx.drawImage(
params.canvas,
0,0,params.width,params.height,
0,0,scaledWidth,scaledHeight
);
if (clear)
ctx.clearRect(rect.left,rect.top,rect.width,rect.height);
ctx.drawImage(
copy,
0,0,scaledWidth,scaledHeight,
0,0,params.width,params.height
);
}
ctx.restore();
params.useData = false;
return true;
} else if (Pixastic.Client.isIE()) {
var radius = 10 * amount;
params.image.style.filter += " progid:DXImageTransform.Microsoft.Blur(pixelradius=" + radius + ")";
if (params.options.fixMargin || 1) {
params.image.style.marginLeft = (parseInt(params.image.style.marginLeft,10)||0) - Math.round(radius) + "px";
params.image.style.marginTop = (parseInt(params.image.style.marginTop,10)||0) - Math.round(radius) + "px";
}
return true;
}
},
checkSupport : function() {
return (Pixastic.Client.hasCanvas() || Pixastic.Client.isIE());
}
}
(C) Æliens
04/09/2009
You may not copy or print any of this material without explicit permission of the author or the publisher.
In case of other copyright issues, contact the author.