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/*
* Neighbor.js by OKFocus - http://okfoc.us - @okfocus
* Version 1.0
* Licensed under MIT.
*
*/
(function($){
$.neighbor = function(el, options){
var base = this;
base.$el = $(el);
base.el = el;
base.$el.data("neighbor", base);
var img;
var active = true, hovering = false;
var canvas, imageData = null;
base.init = function(){
base.options = $.extend({}, $.neighbor.options, options);
if (typeof base.options.scale == "string" && base.options.scale.indexOf("%") != -1) {
base.options.scale = parseInt( base.options.scale.replace("%","") ) / 100;
}
var url = base.options.url || base.el.src;
if (isCrossOrigin( url )) {
Proxy.fetch( url, base.build );
}
if (base.options.url) {
img = new Image ();
img.onload = base.load;
img.src = base.options.url;
}
else {
img = base.el;
img.onload = base.load;
if (img.complete) {
base.build( img );
}
}
};
base.load = function(){
base.build( img );
}
base.build = function( img ){
if (canvas) return;
canvas = document.createElement("canvas");
var nw = canvas.width = img.naturalWidth;
var nh = canvas.height = img.naturalHeight;
var neighbor = document.createElement("canvas");
var w, h, scaleW, scaleH;
if (base.options.scale) {
w = neighbor.width = Math.floor( img.naturalWidth * base.options.scale );
h = neighbor.height = Math.floor( img.naturalHeight * base.options.scale );
}
else {
var bounds = img.getBoundingClientRect();
w = neighbor.width = bounds.width;
h = neighbor.height = bounds.height;
}
scaleH = nh / h;
scaleW = nw / w;
var nctx = canvas.getContext( '2d' );
nctx.drawImage( img, 0, 0 );
nidd = nctx.getImageData( 0, 0, canvas.width, canvas.height )
nid = nidd.data;
var ctx = neighbor.getContext('2d');
var idd = ctx.createImageData( w, h );
var id = idd.data;
for (var i = 0; i <= w; i++) {
for (var j = 0; j <= h; j++) {
var y = Math.floor( j * scaleH );
var x = Math.floor( i * scaleW );
var np = (y * nw + x ) * 4;
var p = (j * w + i ) * 4;
id[ p ] = nid[ np ]
id[ p+1 ] = nid[ np+1 ]
id[ p+2 ] = nid[ np+2 ]
id[ p+3 ] = nid[ np+3 ]
}
}
ctx.putImageData( idd, 0, 0 );
if (base.options.url) {
base.$el.css("background-image", 'url(' + neighbor.toDataURL() + ')');
}
else {
base.el.parentNode.insertBefore( neighbor, base.el );
neighbor.style.display = base.el.style.display;
base.el.style.display = "none";
}
}
base.clamp = function (x, min, max) {
return Math.max(min, Math.min(max, x));
};
base.detect = function (e){
if (! imageData) {
return false;
}
var offset = base.$el.offset();
var x = e.pageX - offset.left;
var y = e.pageY - offset.top;
var pixelOffset = (canvas.width * y + x) * 4;
var alpha = imageData[ pixelOffset + 3 ];
e.rgba = [
imageData[(canvas.width * y + x) * 4 ],
imageData[(canvas.width * y + x) * 4 + 1 ],
imageData[(canvas.width * y + x) * 4 + 2 ],
imageData[(canvas.width * y + x) * 4 + 3 ]
];
e.alpha = alpha;
return alpha > base.options.threshold;
}
base.init();
};
$.neighbor.options = {
url: null,
scale: null
};
$.fn.neighbor = function(options){
return this.each(function(){
(new $.neighbor(this, options));
});
};
function isCrossOrigin (url) {
var partz = url.split("/");
return (partz[0] != window.location.protocol && partz[2] != window.location.hostname);
}
function detectMobile () {
return navigator.userAgent.indexOf("Mobile") !== -1 || navigator.userAgent.indexOf("Android") !== -1;
}
var Proxy = window['Proxy'] || {
fetch: function(url, callback){
var params = {
'url': url
};
$.ajax({
'url': "/proxy/fetch",
'data': params,
'dataType': "jsonp",
'success': function(data){
var img = new Image();
img.onload = function(){
// console.log([data.length, "bytes", img.naturalWidth + "x" + img.naturalHeight].join(" "));
callback(img);
};
img.src = data;
}
});
}
};
})(jQuery);
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