/*! * Retina.js v1.3.0 * * Copyright 2014 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 = {        // An option to choose a suffix for 2x images        retinaImageSuffix : '@2x',
        // Ensure Content-Type is an image before trying to load @2x image        // https://github.com/imulus/retinajs/pull/45)        check_mime_type: true,
        // Resize high-resolution images to original image's pixel dimensions        // https://github.com/imulus/retinajs/issues/8        force_original_dimensions: true    };
    function Retina() {}
    root.Retina = Retina;
    Retina.configure = function(options) {        if (options === null) {            options = {};        }
        for (var prop in options) {            if (options.hasOwnProperty(prop)) {                config[prop] = options[prop];            }        }    };
    Retina.init = function(context) {        if (context === null) {            context = root;        }
        var existing_onload = context.onload || function(){};
        context.onload = function() {            var images = document.getElementsByTagName('img'), retinaImages = [], i, image;            for (i = 0; i < images.length; i += 1) {                image = images[i];                if (!!!image.getAttributeNode('data-no-retina')) {                    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;    };

    var regexMatch = /\.\w+$/;    function suffixReplace (match) {        return config.retinaImageSuffix + match;    }
    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 {            if (undefined !== document.createElement) {                var locationObject = document.createElement('a');                locationObject.href = this.path;                locationObject.pathname = locationObject.pathname.replace(regexMatch, suffixReplace);                this.at_2x_path = locationObject.href;            } else {                var parts = this.path.split('?');                parts[0] = parts[0].replace(regexMatch, suffixReplace);                this.at_2x_path = parts.join('?');            }            this.perform_check = true;        }    }
    root.RetinaImagePath = RetinaImagePath;
    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 {                if (config.force_original_dimensions) {                    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);    }})();