optimole-wp / inc / hero_preloader.php

hero_preloader.php in Optimole – Optimize Images | Convert WebP & AVIF | CDN & Lazy Load | Image Optimization 3.11.2, at inc/hero_preloader.php

175 lines 3.9 KB

Raw Download Zip

1	<?php
2	/**
3	* Optimole Hero Preloader.
4	*
5	* @package Optimole/Inc
6	* @copyright Copyright (c) 2023, Hardeep Asrani
7	* @license http://opensource.org/licenses/gpl-2.0.php GNU Public License
8	*/
9
10	/**
11	* Class Optml_Hero_Preloader
12	*/
13	class Optml_Hero_Preloader {
14
15	/**
16	* Hold the settings object.
17	*
18	* @var Optml_Settings Settings object.
19	*/
20	public $settings;
21
22	/**
23	* Cached object instance.
24	*
25	* @var Optml_Hero_Preloader
26	*/
27	protected static $instance = null;
28
29	/**
30	* Has flagged preloading image.
31	*
32	* @var bool
33	*/
34	protected static $has_flagged_preloading_image = false;
35
36	/**
37	* Has flagged preloading logo to prevent footer logos from being targetted.
38	*
39	* @var bool
40	*/
41	protected static $has_flagged_preloading_logo = false;
42
43	/**
44	* Class instance method.
45	*
46	* @static
47	* @return Optml_Hero_Preloader
48	* @since 3.9.0
49	* @access public
50	*/
51	public static function instance() {
52	if ( null === self::$instance \|\| ( self::$instance->settings !== null && ( ! self::$instance->settings->is_connected() ) ) ) {
53	self::$instance = new self();
54	self::$instance->settings = new Optml_Settings();
55	if ( self::$instance->settings->is_connected() && ! function_exists( 'wp_get_loading_optimization_attributes' ) ) {
56	self::$instance->init();
57	}
58	}
59
60	return self::$instance;
61	}
62
63	/**
64	* The initialize method.
65	*
66	* @since 3.9.0
67	* @access public
68	*/
69	public function init() {
70	add_filter( 'get_header_image_tag_attributes', [ $this, 'add_preload' ] );
71	add_filter( 'post_thumbnail_html', [ $this, 'add_preload_to_thumbnail' ] );
72	add_filter( 'wp_get_attachment_image_attributes', [ $this, 'add_preload_to_image_attributes' ], 10, 2 );
73	add_filter( 'get_custom_logo_image_attributes', [ $this, 'add_preload_to_logo' ] );
74	add_filter( 'wp_content_img_tag', [ $this, 'add_preload_to_thumbnail' ] );
75	}
76
77	/**
78	* Add preload attribute to image.
79	*
80	* @since 3.9.0
81	* @access public
82	*
83	* @param array $attr Image attributes.
84	*
85	* @return array
86	*/
87	public function add_preload( $attr ) {
88	if ( self::$has_flagged_preloading_image ) {
89	return $attr;
90	}
91
92	self::$has_flagged_preloading_image = true;
93
94	$attr['fetchpriority'] = 'high';
95	return $attr;
96	}
97
98	/**
99	* Add preload attribute to thumbnail.
100	*
101	* @since 3.9.0
102	* @access public
103	*
104	* @param string $html The post thumbnail HTML.
105	*
106	* @return string
107	*/
108	public function add_preload_to_thumbnail( $html ) {
109	if ( self::$has_flagged_preloading_image ) {
110	return $html;
111	}
112
113	if ( ! empty( $html ) && strpos( $html, 'loading="lazy"' ) === false && strpos( $html, 'fetchpriority=' ) === false ) {
114	self::$has_flagged_preloading_image = true;
115	$html = str_replace( '<img', '<img fetchpriority="high"', $html );
116	}
117	return $html;
118	}
119
120	/**
121	* Filter attachment image attributes.
122	*
123	* @since 3.9.0
124	* @access public
125	*
126	* @param array $attr Image attributes.
127	* @param object $attachment Image attachment.
128	*
129	* @return array
130	*/
131	public function add_preload_to_image_attributes( $attr, $attachment ) {
132	if ( self::$has_flagged_preloading_image ) {
133	return $attr;
134	}
135
136	global $wp_query;
137
138	$post = null;
139	$queried_post = get_queried_object();
140
141	if ( is_singular() && $queried_post instanceof WP_Post ) {
142	$post = $queried_post;
143	} elseif ( $wp_query->is_main_query() && $wp_query->post_count > 0 && isset( $wp_query->posts[0] ) ) {
144	$post = $wp_query->posts[0];
145	}
146
147	if ( $post instanceof WP_Post && $attachment instanceof WP_Post && (int) get_post_thumbnail_id( $post ) === $attachment->ID ) {
148	$attr = $this->add_preload( $attr );
149	}
150
151	return $attr;
152	}
153
154	/**
155	* Add preload attribute to logo.
156	*
157	* @since 3.9.0
158	* @access public
159	*
160	* @param array $attr Image attributes.
161	*
162	* @return array
163	*/
164	public function add_preload_to_logo( $attr ) {
165	if ( self::$has_flagged_preloading_logo ) {
166	return $attr;
167	}
168
169	self::$has_flagged_preloading_logo = true;
170
171	$attr['fetchpriority'] = 'high';
172	return $attr;
173	}
174	}
175