Gaya/QueryLoader2

/*
 * Modified version of http://github.com/desandro/imagesloaded v2.1.1
 * MIT License. by Paul Irish et al.
 */

'use strict';
var BLANK = 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==';

function loaded(image, callback) {
  var src;

  if (!image.nodeName) {
    return callback(new Error('First argument must be an image element'));
  }

  if (image.nodeName.toLowerCase() !== 'img') {
    return callback(new Error('Element supplied is not an image'));
  }

  if (image.src && image.complete && image.naturalWidth !== undefined) {
    return callback(null, true);
  }

  function bindEvent(element, event, attach, cb) {
    if (!element.addEventListener) {
      element[(attach ? 'attachEvent' : 'detachEvent')]('on' + event, cb);
    } else {
      element[(attach ? 'addEventListener' : 'removeEventListener')](event, cb);
    }
  }

  function onload() {
    bindEvent(image, 'load', false, onload);
    bindEvent(image, 'error', false, onload);

    callback(null, false);
  }

  bindEvent(image, 'load', true, onload);
  bindEvent(image, 'error', true, onload);

  if (image.readyState || image.complete) {
    src = image.src;
    image.src = BLANK;
    image.src = src;
  }
}

module.exports = loaded;