( function () {
	'use strict';

	if ( typeof window.wpcom === 'undefined' ) {
		window.wpcom = {};
	}

	if ( window.wpcom.carousel ) {
		return;
	}

	var prebuilt_widths = jetpackCarouselStrings.widths;
	var pageviews_stats_args = jetpackCarouselStrings.stats_query_args;

	var findFirstLargeEnoughWidth = function ( original_w, original_h, dest_w, dest_h ) {
		var inverse_ratio = original_h / original_w;

		for ( var i = 0; i < prebuilt_widths.length; ++i ) {
			if ( prebuilt_widths[ i ] >= dest_w || prebuilt_widths[ i ] * inverse_ratio >= dest_h ) {
				return prebuilt_widths[ i ];
			}
		}

		return original_w;
	};

	var removeResizeFromImageURL = function ( url ) {
		return removeArgFromURL( url, 'resize' );
	};

	var removeArgFromURL = function ( url, arg ) {
		var re = new RegExp( '[\\?&]' + arg + '(=[^?&]+)?' );
		if ( url.match( re ) ) {
			return url.replace( re, '' );
		}
		return url;
	};

	var addWidthToImageURL = function ( url, width ) {
		width = parseInt( width, 10 );
		// Give devices with a higher devicePixelRatio higher-res images (Retina display = 2, Android phones = 1.5, etc)
		if ( 'undefined' !== typeof window.devicePixelRatio && window.devicePixelRatio > 1 ) {
			width = Math.round( width * window.devicePixelRatio );
		}
		url = addArgToURL( url, 'w', width );
		url = addArgToURL( url, 'h', '' );
		return url;
	};

	var addArgToURL = function ( url, arg, value ) {
		var re = new RegExp( arg + '=[^?&]+' );
		if ( url.match( re ) ) {
			return url.replace( re, arg + '=' + value );
		} else {
			var divider = url.indexOf( '?' ) !== -1 ? '&' : '?';
			return url + divider + arg + '=' + value;
		}
	};

	var stat = function ( names ) {
		if ( typeof names !== 'string' ) {
			names = names.join( ',' );
		}

		new Image().src = window.location.protocol +
			'//pixel.wp.com/g.gif?v=wpcom-no-pv' +
			'&x_carousel=' + names +
			'&baba=' + Math.random();
	};

	var pageview = function ( post_id ) {
		new Image().src = window.location.protocol +
			'//pixel.wp.com/g.gif?host=' + encodeURIComponent( window.location.host ) +
			'&ref=' + encodeURIComponent( document.referrer ) +
			'&rand=' + Math.random() +
			'&' + pageviews_stats_args +
			'&post=' + encodeURIComponent( post_id );
	};

	var generateImgSrc = function ( srcItem, max ) {
		var origSize = srcItem.getAttribute( 'data-orig-size' ) || '';

		var src = srcItem.getAttribute( 'src' ) || srcItem.getAttribute( 'original' ) || srcItem.getAttribute( 'data-original' ) || srcItem.getAttribute( 'data-lazy-src' );
		if ( src.indexOf( 'imgpress' ) !== -1 ) {
			src = srcItem.getAttribute( 'data-orig-file' );
		}
		// Square/Circle galleries use a resize param that needs to be removed.
		src = removeResizeFromImageURL( src );
		src = addWidthToImageURL(
			src,
			findFirstLargeEnoughWidth( origSize.width, origSize.height, max.width, max.height )
		);

		return src;
	};

	window.wpcom.carousel = {
		findFirstLargeEnoughWidth: findFirstLargeEnoughWidth,
		removeResizeFromImageURL: removeResizeFromImageURL,
		addWidthToImageURL: addWidthToImageURL,
		stat: stat,
		pageview: pageview,
		generateImgSrc: generateImgSrc
	};

} )();
;
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