hotaru - automagically replaces images with retina display variants

README.markdown

hotaru

Just add a retina-src attribute to img tags pointing to a Retina Display version of your image, load this script, and Retina Display resources will automatically get subbed in when appropriate.

License

Copyright (c) 2012 Yanik Magnan ([email protected])

Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

hotaru.coffee

# hotaru - automagically replaces images with retina display variants
# by Yanik Magnan - http://r-ch.net

hotaru = () ->
  return if !window.devicePixelRatio? or window.devicePixelRatio != 2
  for el in document.getElementsByTagName "img"
    do (el) ->
      retina_src = el.getAttribute "retina-src"
      if retina_src?
        el.setAttribute "width", el.offsetWidth
        el.setAttribute "height", el.offsetHeight
        el.setAttribute "src", retina_src

window.addEventListener "load", hotaru, false

hotaru.min.js

(function() {
  var hotaru;

  hotaru = function() {
    var el, _i, _len, _ref, _results;
    if (!(window.devicePixelRatio != null) || window.devicePixelRatio !== 2) {
      return;
    }
    _ref = document.getElementsByTagName("img");
    _results = [];
    for (_i = 0, _len = _ref.length; _i < _len; _i++) {
      el = _ref[_i];
      _results.push((function(el) {
        var retina_src;
        retina_src = el.getAttribute("retina-src");
        if (retina_src != null) {
          el.setAttribute("width", el.offsetWidth);
          el.setAttribute("height", el.offsetHeight);
          return el.setAttribute("src", retina_src);
        }
      })(el));
    }
    return _results;
  };

  window.addEventListener("load", hotaru, false);

}).call(this);