https://net-k.net/wp/wp-content/plugins/jetpack/modules/photon/photon.js?ver=20130122

1/* jshint onevar: false */
2
3(function($){
4	/**
5	 * For images lacking explicit dimensions and needing them, try to add them.
6	 */
7	var restore_dims = function() {
8		$( 'img[data-recalc-dims]' ).each( function recalc() {
9			var $this = $( this );
10			if ( this.complete ) {
11
12				// Support for lazy loading: if there is a lazy-src
13				// attribute and it's value is not the same as the current src we
14				// should wait until the image load event
15				if ( $this.data( 'lazy-src' ) && $this.attr( 'src' ) !== $this.data( 'lazy-src' ) ) {
16					$this.load( recalc );
17					return;
18				}
19
20				var width = this.width,
21					height = this.height;
22
23				if ( width && width > 0 && height && height > 0 ) {
24					$this.attr( {
25						width: width,
26						height: height
27					} );
28
29					reset_for_retina( this );
30				}
31			}
32			else {
33				$this.load( recalc );
34			}
35		} );
36	},
37
38	/**
39	 * Modify given image's markup so that devicepx-jetpack.js will act on the image and it won't be reprocessed by this script.
40	 */
41	reset_for_retina = function( img ) {
42		$( img ).removeAttr( 'data-recalc-dims' ).removeAttr( 'scale' );
43	};
44
45	/**
46	 * Check both when page loads, and when IS is triggered.
47	 */
48	$( document ).ready( restore_dims );
49
50	if ( 'on' in $.fn ) {
51		$( document.body ).on( 'post-load', restore_dims );
52	} else {
53		$( document ).delegate( 'body', 'post-load', restore_dims );
54	}
55})(jQuery);