First pass at tracking individual image hits when full-screen, in Car…

…ousel

modules/carousel/jetpack-carousel.js

@@ -692,6 +692,14 @@ jQuery(document).ready(function($) {
 				caption.fadeOut( 'fast' ).empty();
 			}
 
+			// Record pageview in WP Stats, for each new image loaded full-screen.
+			if ( jetpackCarouselStrings.stats ) {
+				new Image().src = document.location.protocol +
+					'//pixel.wp.com/g.gif?' +
+					jetpackCarouselStrings.stats +
+					'&post=' + encodeURIComponent( attachmentId ) +
+					'&rand=' + Math.random();
+			}
 
 			// Load the images for the next and previous slides.
 			$( next ).add( previous ).each( function() {

modules/carousel/jetpack-carousel.php

@@ -211,6 +211,24 @@ function enqueue_assets( $output ) {
 				}
 			}
 
+			/**
+			 * Handle WP stats for images in full-screen.
+			 * Build string with tracking info.
+			 */
+			if ( ! in_array( 'stats', Jetpack::get_active_modules() ) ) {
+				$localize_strings['stats'] = 'blog=' . Jetpack_Options::get_option( 'id' ) . '&host=' . parse_url( get_option( 'home' ), PHP_URL_HOST ) . '&v=ext&j=' . JETPACK__API_VERSION . ':' . JETPACK__VERSION;
+
+				// Set the stats as empty if user is logged in but logged-in users shouldn't be tracked.
+				if ( is_user_logged_in() && function_exists( 'stats_get_options' ) ) {
+					$stats_options = stats_get_options();
+					$track_loggedin_users = isset( $stats_options['reg_users'] ) ? (bool) $stats_options['reg_users'] : false;
+
+					if ( ! $track_loggedin_users ) {
+						$localize_strings['stats'] = '';
+					}
+				}
+			}
+
 			/**
 			 * Filter the strings passed to the Carousel's js file.
 			 *