/*!
 * retina.js v1.1.0
 *
 * copyright 2013 imulus, llc
 * released under the mit license
 *
 * retina.js is an open source script that makes it easy to serve
 * high-resolution images to devices with retina displays.
 */
(function(){var root=typeof exports=="undefined"?window:exports;var config={check_mime_type:true};root.retina=retina;function retina(){}retina.configure=function(options){if(options==null)options={};for(var prop in options)config[prop]=options[prop]};retina.init=function(context){if(context==null)context=root;var existing_onload=context.onload||new function;context.onload=function(){var images=document.getelementsbytagname("img"),retinaimages=[],i,image;for(i=0;i<images.length;i++){image=images[i];retinaimages.push(new retinaimage(image))}existing_onload()}};retina.isretina=function(){var mediaquery="(-webkit-min-device-pixel-ratio: 1.5),                      (min--moz-device-pixel-ratio: 1.5),                      (-o-min-device-pixel-ratio: 3/2),                      (min-resolution: 1.5dppx)";if(root.devicepixelratio>1)return true;if(root.matchmedia&&root.matchmedia(mediaquery).matches)return true;return false};root.retinaimagepath=retinaimagepath;function retinaimagepath(path,at_2x_path){this.path=path;if(typeof at_2x_path!=="undefined"&&at_2x_path!==null){this.at_2x_path=at_2x_path;this.perform_check=false}else{this.at_2x_path=path.replace(/\.\w+$/,function(match){return"@2x"+match});this.perform_check=true}}retinaimagepath.confirmed_paths=[];retinaimagepath.prototype.is_external=function(){return!!(this.path.match(/^https?\:/i)&&!this.path.match("//"+document.domain))};retinaimagepath.prototype.check_2x_variant=function(callback){var http,that=this;if(this.is_external()){return callback(false)}else if(!this.perform_check&&typeof this.at_2x_path!=="undefined"&&this.at_2x_path!==null){return callback(true)}else if(this.at_2x_path in retinaimagepath.confirmed_paths){return callback(true)}else{http=new xmlhttprequest;http.open("head",this.at_2x_path);http.onreadystatechange=function(){if(http.readystate!=4){return callback(false)}if(http.status>=200&&http.status<=399){if(config.check_mime_type){var type=http.getresponseheader("content-type");if(type==null||!type.match(/^image/i)){return callback(false)}}retinaimagepath.confirmed_paths.push(that.at_2x_path);return callback(true)}else{return callback(false)}};http.send()}};function retinaimage(el){this.el=el;this.path=new retinaimagepath(this.el.getattribute("src"),this.el.getattribute("data-at2x"));var that=this;this.path.check_2x_variant(function(hasvariant){if(hasvariant)that.swap()})}root.retinaimage=retinaimage;retinaimage.prototype.swap=function(path){if(typeof path=="undefined")path=this.path.at_2x_path;var that=this;function load(){if(!that.el.complete){settimeout(load,5)}else{that.el.setattribute("width",that.el.offsetwidth);that.el.setattribute("height",that.el.offsetheight);that.el.setattribute("src",path)}}load()};if(retina.isretina()){retina.init(root)}})();