https://to-be-better.ru/sites/default/files/js/js_UVlomK9-AYJ481XmCJ89X0KMn7sVXPhQRVggL3YnXH0.js

1// retina.js, a high-resolution image swapper (http://retinajs.com), v0.0.2
2
3(function() {
4
5  var root = (typeof exports == 'undefined' ? window : exports);
6
7
8
9  root.Retina = Retina;
10
11  function Retina() {}
12
13  Retina.init = function(context) {
14    if (context == null) context = root;
15
16    var existing_onload = context.onload || new Function;
17
18    context.onload = function() {
19      var images = document.getElementsByTagName("img"), retinaImages = [], i, image;
20      for (i = 0; i < images.length; i++) {
21        image = images[i];
22        retinaImages.push(new RetinaImage(image));
23      }
24      existing_onload();
25    }
26  };
27
28  Retina.isRetina = function(){
29    var mediaQuery = "(-webkit-min-device-pixel-ratio: 1.5),\
30                      (min--moz-device-pixel-ratio: 1.5),\
31                      (-o-min-device-pixel-ratio: 3/2),\
32                      (min-resolution: 1.5dppx)";
33
34    if (root.devicePixelRatio > 1)
35      return true;
36
37    if (root.matchMedia && root.matchMedia(mediaQuery).matches)
38      return true;
39
40    return false;
41  };
42
43
44  root.RetinaImagePath = RetinaImagePath;
45
46  function RetinaImagePath(path) {
47    this.path = path;
48    this.at_2x_path = path.replace(/\.\w+$/, function(match) { return "@2x" + match; });
49  }
50
51  RetinaImagePath.confirmed_paths = [];
52
53  RetinaImagePath.prototype.at_2x_path_loads = function(callback) {
54    var variant = new Image();
55    variant.onload  = function() { return callback(true);  }
56    variant.onerror = function() { return callback(false); }
57    variant.src = this.at_2x_path;
58  }
59
60  RetinaImagePath.prototype.check_2x_variant = function(callback) {
61    var that = this;
62    if (RetinaImagePath.confirmed_paths.indexOf(this.at_2x_path) != -1) {
63      return callback(true);
64    } else {
65      this.at_2x_path_loads(function(wasLoaded) {
66        if (wasLoaded) RetinaImagePath.confirmed_paths.push(that.at_2x_path);
67        return callback(wasLoaded);
68      });
69    }
70  }
71
72
73
74  function RetinaImage(el) {
75    this.el = el;
76    this.path = new RetinaImagePath(this.el.getAttribute('src'));
77    var that = this;
78    this.path.check_2x_variant(function(hasVariant) {
79      if (hasVariant) that.swap();
80    });
81  }
82
83  root.RetinaImage = RetinaImage;
84
85  RetinaImage.prototype.swap = function(path) {
86    if (typeof path == 'undefined') path = this.path.at_2x_path;
87
88    var that = this;
89    function load() {
90      if (! that.el.complete) {
91        setTimeout(load, 5);
92      } else {
93        that.el.setAttribute('width', that.el.offsetWidth);
94        that.el.setAttribute('height', that.el.offsetHeight);
95        that.el.setAttribute('src', path);
96      }
97    }
98    load();
99  }
100
101
102
103
104  if (Retina.isRetina()) {
105    Retina.init(root);
106  }
107
108})();;