Current Directory: /home/astoriaah/www/old15/media/mod_zentools/js/effects
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/*
* Based on Darcy Clarke's code
*/
(function($) {
// Grayscale w canvas method
function grayscaleEffect(src){
var canvas = document.createElement('canvas');
var ctx = canvas.getContext('2d');
var imgObj = new Image();
imgObj.src = src;
canvas.width = imgObj.width;
canvas.height = imgObj.height;
ctx.drawImage(imgObj, 0, 0);
var imgPixels = ctx.getImageData(0, 0, canvas.width, canvas.height);
for(var y = 0; y < imgPixels.height; y++){
for(var x = 0; x < imgPixels.width; x++){
var i = (y * 4) * imgPixels.width + x * 4;
var avg = (imgPixels.data[i] + imgPixels.data[i + 1] + imgPixels.data[i + 2]) / 3;
imgPixels.data[i] = avg;
imgPixels.data[i + 1] = avg;
imgPixels.data[i + 2] = avg;
}
}
ctx.putImageData(imgPixels, 0, 0, 0, 0, imgPixels.width, imgPixels.height);
return canvas.toDataURL();
}
$.fn.grayscale = function() {
this.each(function(i, el) {
var $this = $(el);
// Fade in images so there isn't a color "pop" document load and then on window load
$this.fadeIn(500);
// Clone image
$this.each(function() {
if (this.src.length === 0)
{
return;
}
var el = $(this);
var clone = el.css({"position":"absolute"}).wrap("<div class='img_wrapper' style='display: inline-block'>").clone().addClass('img_grayscale').css({"position":"absolute","z-index":"998","opacity":"0"}).insertBefore(el).queue(function(){
var el = $(this);
el.parent().css({"width":jQuery(this).width(),"height":jQuery(this).height()});
el.dequeue();
});
if (document.all && !document.addEventListener) {
// IE 8
this.style.filter = 'progid:DXImageTransform.Microsoft.BasicImage(grayScale=1)'
}
else {
this.src = grayscaleEffect(this.src);
}
clone.on('mouseover', function() {
$(this).parent().find('img:first').stop().animate({opacity:1}, 300);
});
clone.on('mouseout', function() {
$(this).stop().animate({opacity:0}, 300);
});
});
});
};
})(jQuery);