installed plugin W3 Total Cache version 2.3.2

wp-content/plugins/w3-total-cache/UserExperience_LazyLoad_Mutator_Picture.php

@@ -0,0 +1,52 @@
+<?php
+namespace W3TC;
+
+class UserExperience_LazyLoad_Mutator_Picture {
+	private $common;
+
+
+
+	public function __construct( $common ) {
+		$this->common = $common;
+	}
+
+
+
+	public function run( $content ) {
+		$content = preg_replace_callback(
+			'~(<img\s[^>]+>)~i',
+			array( $this, 'tag_img' ), $content
+		);
+
+		$content = preg_replace_callback(
+			'~(<source\s[^>]+>)~i',
+			array( $this, 'tag_source' ), $content
+		);
+
+		return $content;
+	}
+
+
+
+	public function tag_img( $matches ) {
+		$content = $matches[0];
+
+		// get image dimensions
+		$dim = $this->common->tag_get_dimensions( $content );
+		return $this->common->tag_img_content_replace( $content, $dim );
+	}
+
+
+
+	/**
+	 * Common replace code for picture and img tags
+	 */
+	private function tag_source( $matches ) {
+		$content = $matches[0];
+
+		$content = preg_replace( '~(\s)(srcset|sizes)=~i',
+			'$1data-$2=', $content );
+
+		return $content;
+	}
+}