Add WebP for uploads module

modules/webp-uploads/load.php

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+<?php
+/**
+ * WebP-Uploads Module
+ *
+ * @package performance-lab
+ * @since 1.0.0
+ *
+ * Module Name: WebP uploads.
+ * Description: Uses WebP as the default format for new JPEG image uploads if the server supports it.
+ * Focus: images
+ * Experimental: No
+ */
+
+// Only enable if the server supports WebP.
+add_filter( 'image_editor_output_format', 'webp_default_filter_image_editor_output_format', 10, 3 );
+
+/**
+ * Filter the image editor default output format mapping.
+ *
+ * For uploaded JPEG images, map the default output format to WebP.
+ *
+ * @since 1.0.0
+ *
+ * @param string $output_format The image editor default output format mapping.
+ * @param string $filename      Path to the image.
+ * @param string $mime_type     The source image mime type.
+ * @return string The new output format mapping.
+ */
+function webp_default_filter_image_editor_output_format( $output_format, $filename, $mime_type ) {
+	if ( ! wp_image_editor_supports( array( 'mime_type' => 'image/webp' ) ) ) {
+		return $output_format;
+	}
+
+	// WebP lossless support is still limited on servers, so only apply to JPEGs.
+	if ( 'image/jpeg' !== $mime_type ) {
+		return $output_format;
+	}
+
+	$output_format['image/jpeg'] = 'image/webp';
+
+	return $output_format;
+}
+

tests/webp-uploads-test.php

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+<?php
+/**
+ * Tests for webp-uploads module.
+ *
+ * @package performance-lab
+ */
+
+class WebP_Uploads_Tests extends WP_UnitTestCase {
+
+	/**
+	 * Test if webp-uploads is loaded and filter applied when system supports WebP.
+	 */
+	function test_webp_uploads_is_loaded() {
+		// Test before enabling.
+		$output_format = apply_filters( 'image_editor_output_format', array(), '', 'image/jpeg' );
+		$this->assertEquals( array(), $output_format );
+
+		// Activate the module.
+		$new_value = array(
+			'webp-uploads' => array( 'enabled' => true ),
+		);
+		update_option( PERFLAB_MODULES_SETTING, $new_value );
+		perflab_load_active_modules();
+
+		if ( ! wp_image_editor_supports( array( 'mime_type' => 'image/webp' ) ) ) {
+			$expect = array();
+		} else {
+			$expect = array(
+				'image/jpeg' => 'image/webp',
+			);
+		}
+
+		$output_format = apply_filters( 'image_editor_output_format', array(), '', 'image/jpeg' );
+		$this->assertEquals( $expect, $output_format );
+
+		// Cleanup.
+		update_option( PERFLAB_MODULES_SETTING, array() );
+	}
+}