ReSct.it Script

gistfile1.js

var ReSRC = function() {
    "use strict";
    function h(e, t, n) {
        var r = new Array;
        t == null && (t = document);
        n == null && (n = "*");
        var i = t.getElementsByTagName(n), s = i.length, o = new RegExp("(^|\\s)" + e + "(\\s|$)"), u, a;
        for (u = 0, a = 0; u < s; u++) if (o.test(i[u].className)) {
            r[a] = i[u];
            a++;
        }
        return r;
    }
    function p(e, t) {
        var n = new Image;
        n.src = t;
        n.onload = function() {
            e.src = t;
        };
    }
    function d() {
        if (new Date - o < a) setTimeout(d, a); else {
            u = !1;
            ReSRC.reSrcImages();
        }
    }
    var e = 10, t = 10, n = window.name || "0,0", r = ".resrc.it", i = "http://resrc.it/img/img.jpg?n=" + Math.random(), s = 21912, o = new Date, u = !1, a = 200, f = parseInt((new Date).getTime() / 1e3), l = n.split(","), c = l[0];
    Array.prototype.indexOf || (Array.prototype.indexOf = function(e) {
        for (var t = 0; t < this.length; t++) if (this[t] === e) return t;
        return -1;
    });
    String.prototype.startsWith = function(e) {
        return this.match("^" + e) == e;
    };
    Number.prototype.between = function(e, t) {
        return e < t ? this >= e && this <= t : this >= t && this <= e;
    };
    window.onresize = function() {
        o = new Date;
        if (u == 0) {
            u = !0;
            setTimeout(d, a);
        }
    };
    return {
        getBandwidth: function() {
            var e, t, n = new Image;
            n.src = i;
            e = (new Date).getTime();
            n.onload = function() {
                var t = (new Date).getTime(), n = parseInt(t / 1e3), r = (t - e) / 1e3, i = s * 8, o = Math.round(i / r), u = parseInt(o / 1024).toFixed(0), a = parseInt(u / 1024).toFixed(0);
                window.name = n + "," + u;
            };
        },
        getOptimizationParam: function(e) {
            var t = parseInt(e), n;
            t == 0 ? n = "m" : t.between(1, 50) ? n = "l" : t.between(51, 100) ? n = "m" : t.between(101, 800) ? n = "h" : n = "f";
            return "/ro=" + n;
        },
        getPixelRatio: function() {
            return window.devicePixelRatio ? window.devicePixelRatio : 1;
        },
        getHostURL: function(e) {
            var t = Math.floor(Math.random() * 4 + 1), n = ".*?", i = "(-)", s = "((?:[a-z][a-z]+))", o = new RegExp(n + i + s, [ "i" ]), u = o.exec(e);
            if (u != null) {
                var a = u[2];
                return a == "uk" ? "http://app" + t + "-" + "uk" + r + "/" : "http://app" + t + r + "/";
            }
            return "http://app" + t + r + "/";
        },
        reSrcImages: function() {
            f >= parseInt(c) + t && ReSRC.getBandwidth();
            var n = h("resrc");
            for (var r = 0; r < n.length; r++) {
                var i = n[r].tagName.toLowerCase();
                if (i == "img") {
                    var s = n[r].src.toLowerCase();
                    s = s.replace("/http://", "//");
                    s = s.replace("http://", "//");
                    s = s.replace("//", "");
                    var o = 0, u = "/", a = s.split(u).slice(0, 1), d = s.split(u).slice(1);
                    for (var v = 0; v < d.length; v++) if (d[v].startsWith("s=w")) {
                        var m = "((?:[a-z][a-z]*[0-9]+[a-z0-9]*))", g = new RegExp(m, [ "i" ]), y = g.exec(d[v]);
                        if (y != null) {
                            var b = y[1], w = [ "w", "p" ];
                            b = b.replace(new RegExp("(" + w.join("|") + ")", "g"), "");
                            o = parseInt(b);
                        }
                        d.splice(v, 1);
                        v--;
                    } else if (d[v].startsWith("ro=")) {
                        d.splice(v, 1);
                        v--;
                    }
                    var E = d.join(u), S = "//", x = E.split(S), T, N;
                    if (x.length == 1) {
                        T = "";
                        N = x[0];
                    } else {
                        T = x[0];
                        N = x[1];
                    }
                    N.startsWith("/") && (N = N.substring(1));
                    var C = n[r].getAttribute("data-resrc") || "", k;
                    C == "retina" ? k = 2 : C == "no-retina" ? k = 1 : k = ReSRC.getPixelRatio();
                    var L;
                    n[r].width == 0 ? o == 0 ? L = "" : L = "/s=w" + o + ",pd" + k : L = "/s=w" + Math.ceil(n[r].width / e) * e + ",pd" + k;
                    var A = ReSRC.getOptimizationParam(l[1]), O = ReSRC.getHostURL(a) + T + L + A + "/http://" + N;
                    p(n[r], O);
                }
            }
        }
    };
}();

ReSRC.reSrcImages();