qa

Signed-off-by: Jeff <jeff@gotenzing.com>

+#, fuzzy
+msgid ""
+msgstr ""
+"Project-Id-Version: PDF Thumbnail Generator\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2022-07-07 21:13+0000\n"
+"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language-Team: \n"
+"Language: \n"
+"Plural-Forms: nplurals=INTEGER; plural=EXPRESSION;\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"X-Generator: Loco https://localise.biz/\n"
+"X-Loco-Version: 2.6.2; wp-6.0\n"
+"X-Domain: pdf-thumbnail-generator"
+
+#: pdf-thumbnail-generator.php:113
+msgid "Back to the settings"
+msgstr ""
+
+#: pdf-thumbnail-generator.php:185
+msgid "Generate missing PDF thumbnails"
+msgstr ""
+
+#: pdf-thumbnail-generator.php:180
+msgid "Generate thumbnails for already uploaded PDFs"
+msgstr ""
+
+#: pdf-thumbnail-generator.php:111
+#, php-format
+msgid "Generated thumbnails: %d"
+msgstr ""
+
+#. Description of the plugin
+msgid "Generates thumbnail for PDF files"
+msgstr ""
+
+#: pdf-thumbnail-generator.php:88
+msgid "Generating PDF thumbnails..."
+msgstr ""
+
+#: pdf-thumbnail-generator.php:182
+msgid "If you changed some settings, please save them firstly."
+msgstr ""
+
+#: pdf-thumbnail-generator.php:46
+msgid ""
+"Imagick is missing on your server. PDF Thumbnail Generator can not work "
+"without it."
+msgstr ""
+
+#: pdf-thumbnail-generator.php:148
+msgid "Max height"
+msgstr ""
+
+#: pdf-thumbnail-generator.php:140
+msgid "Max width"
+msgstr ""
+
+#: pdf-thumbnail-generator.php:101
+#, php-format
+msgid "New thumbnail was generated for %d"
+msgstr ""
+
+#. Name of the plugin
+msgid "PDF Thumbnail Generator"
+msgstr ""
+
+#: pdf-thumbnail-generator.php:58 pdf-thumbnail-generator.php:59
+#: pdf-thumbnail-generator.php:132
+msgid "PDF Thumbnails"
+msgstr ""
+
+#: pdf-thumbnail-generator.php:156
+msgid "Quality"
+msgstr ""
+
+#: pdf-thumbnail-generator.php:189
+msgid "Regenerate all PDF thumbnails"
+msgstr ""
+
+#: pdf-thumbnail-generator.php:177
+msgid "Save"
+msgstr ""
+
+#: pdf-thumbnail-generator.php:68
+msgid "Settings"
+msgstr ""
+
+#: pdf-thumbnail-generator.php:133
+msgid "Settings saved."
+msgstr ""
+
+#: pdf-thumbnail-generator.php:103 pdf-thumbnail-generator.php:106
+#, php-format
+msgid "Thumbnail already exists for %d"
+msgstr ""
+
+#: pdf-thumbnail-generator.php:164
+msgid "Type"
+msgstr ""

+<?php
+/*
+	Plugin Name: PDF Thumbnail Generator
+	Plugin URI: https://wp-speedup.eu
+	Description: Generates thumbnail for PDF files
+	Version: 1.1
+	Author: KubiQ
+	Author URI: https://kubiq.sk
+	Text Domain: pdf-thumbnail-generator
+	Domain Path: /languages
+*/
+
+defined('ABSPATH') || exit;
+
+if( ! class_exists('pdf_thumbnail_generator') ){
+	class pdf_thumbnail_generator{
+		var $settings;
+
+		function __construct(){
+			add_action( 'plugins_loaded', array( $this, 'plugins_loaded' ) );
+			add_action( 'admin_menu', array( $this, 'plugin_menu_link' ) );
+			add_action( 'init', array( $this, 'plugin_init' ) );
+			add_action( 'add_attachment', array( $this, 'generate_thumbnail' ), 11, 1 );
+			add_action( 'delete_attachment', array( $this, 'delete' ) );
+			add_filter( 'wp_mime_type_icon', array( $this, 'wp_mime_type_icon' ), 10, 3 );
+
+			add_shortcode( 'pdf_thumbnail', function( $atts ){
+				if( is_admin() ) return true;
+				
+				if( ! isset( $atts['id'] ) || ! intval( $atts['id'] ) ) return false;
+			
+				return get_pdf_thumbnail_image( $atts['id'] );
+			});
+
+			add_shortcode( 'pdf_thumbnail_url', function( $atts ){
+				if( is_admin() ) return true;
+				
+				if( ! isset( $atts['id'] ) || ! intval( $atts['id'] ) ) return false;
+			
+				return $this->get_url( $atts['id'] );
+			});
+		}
+
+		function activate(){
+			if( ! extension_loaded('imagick') ){
+				esc_html_e( 'Imagick is missing on your server. PDF Thumbnail Generator can not work without it.', 'pdf-thumbnail-generator' );
+				exit;
+			}
+		}
+
+		function plugins_loaded(){
+			load_plugin_textdomain( 'pdf-thumbnail-generator', FALSE, basename( __DIR__ ) . '/languages/' );
+		}
+
+		function plugin_menu_link(){
+			add_submenu_page(
+				'options-general.php',
+				__( 'PDF Thumbnails', 'pdf-thumbnail-generator' ),
+				__( 'PDF Thumbnails', 'pdf-thumbnail-generator' ),
+				'manage_options',
+				basename( __FILE__ ),
+				array( $this, 'admin_options_page' )
+			);
+			add_filter( 'plugin_action_links_' . plugin_basename( __FILE__ ), array( $this, 'filter_plugin_actions' ), 10, 2 );
+		}
+
+		function filter_plugin_actions( $links, $file ){
+			array_unshift( $links, '<a href="options-general.php?page=' . basename( __FILE__ ) . '">' . __( 'Settings', 'pdf-thumbnail-generator' ) . '</a>' );
+			return $links;
+		}
+
+		function plugin_init(){
+			$this->settings = array_merge(
+				array(
+					'max_width' => 1024,
+					'max_height' => 1024,
+					'quality' => 80,
+					'type' => 'png',
+				),
+				get_option( 'pdf_thumbnail_generator_settings', array() )
+			);
+		}
+
+		function admin_options_page(){
+			global $wpdb;
+			if( isset( $_GET['generate'] ) ){ ?>
+				<div class="wrap">
+					<h2><?php _e( 'Generating PDF thumbnails...', 'pdf-thumbnail-generator' ) ?></h2>
+					<div id="pdf-list"><?php
+						$generated_thumbs = 0;
+						$pdfs = $wpdb->get_col("SELECT ID FROM {$wpdb->posts} WHERE {$wpdb->posts}.post_type = 'attachment' AND {$wpdb->posts}.post_mime_type = 'application/pdf'");
+						if( $pdfs ){
+							foreach( $pdfs as $pdf ){
+								$regenerate = true;
+								$thumbnail;
+								if( ! $thumbnail || $regenerate ){
+									$generated = $this->generate_thumbnail( $pdf, $regenerate );
+									$thumbnail = get_post_meta( $pdf, '_pdf_thumbnail', true );
+									if( $thumbnail && $generated ){
+										$generated_thumbs++;
+										echo '<div>' . sprintf( esc_html__( 'New thumbnail was generated for %d', 'pdf-thumbnail-generator' ), $pdf ) . '</div>';
+									}else{
+										echo '<div>' . sprintf( esc_html__( 'Thumbnail already exists for %d', 'pdf-thumbnail-generator' ), $pdf ) . '</div>';
+									}
+								}else{
+									echo '<div>' . sprintf( esc_html__( 'Thumbnail already exists for %d', 'pdf-thumbnail-generator' ), $pdf ) . '</div>';
+								}
+							}
+						}
+
+						echo '<div>' . sprintf( esc_html__( 'Generated thumbnails: %d', 'pdf-thumbnail-generator' ), $generated_thumbs ) . '</div>';
+
+						echo '<br><a href="' . remove_query_arg('generate') . '" class="button button-primary">' . __( 'Back to the settings', 'pdf-thumbnail-generator' ) . '</a>'; ?>
+					</div>
+				</div><?php
+			}else{
+				$show_update_notice = false;
+				if( isset( $_POST['plugin_sent'] ) ){
+					if( check_admin_referer( 'save_these_settings', 'settings_nonce' ) ){
+
+						$this->settings = array();
+						$this->settings['max_width'] = intval( $_POST['max_width'] );
+						$this->settings['max_height'] = intval( $_POST['max_height'] );
+						$this->settings['quality'] = intval( $_POST['quality'] );
+						$this->settings['type'] = $_POST['type'] == 'jpg' ? 'jpg' : 'png';
+
+						update_option( 'pdf_thumbnail_generator_settings', $this->settings );
+						$show_update_notice = true;
+					}
+				} ?>
+				<div class="wrap">
+					<h2><?php _e( 'PDF Thumbnails', 'pdf-thumbnail-generator' ) ?></h2>
+					<?php if( $show_update_notice ) echo '<div class="below-h2 updated"><p>' . __( 'Settings saved.', 'pdf-thumbnail-generator' ) . '</p></div>'; ?>
+					<form method="post" action="<?php echo admin_url( 'options-general.php?page=' . basename( __FILE__ ) ) ?>">
+						<input type="hidden" name="plugin_sent" value="1">
+						<?php wp_nonce_field( 'save_these_settings', 'settings_nonce' ) ?>
+						<table class="form-table">
+							<tr>
+								<th>
+									<label for="q_field_1"><?php _e( 'Max width', 'pdf-thumbnail-generator' ) ?></label> 
+								</th>
+								<td>
+									<input type="number" name="max_width" value="<?php echo intval( $this->settings['max_width'] ) ?>" id="q_field_1"> px
+								</td>
+							</tr>
+							<tr>
+								<th>
+									<label for="q_field_2"><?php _e( 'Max height', 'pdf-thumbnail-generator' ) ?></label> 
+								</th>
+								<td>
+									<input type="number" name="max_height" value="<?php echo intval( $this->settings['max_height'] ) ?>" id="q_field_2"> px
+								</td>
+							</tr>
+							<tr>
+								<th>
+									<label for="q_field_3"><?php _e( 'Quality', 'pdf-thumbnail-generator' ) ?></label> 
+								</th>
+								<td>
+									<input type="number" min="1" max="100" name="quality" value="<?php echo intval( $this->settings['quality'] ) ?>" id="q_field_3"> %&emsp;<small>(1-100)</small>
+								</td>
+							</tr>
+							<tr>
+								<th>
+									<label><?php _e( 'Type', 'pdf-thumbnail-generator' ) ?></label> 
+								</th>
+								<td>
+									<label>
+										<input type="radio" name="type" value="png" <?php echo $this->settings['type'] == 'png' ? 'checked' : '' ?>> png
+									</label>
+									&emsp;
+									<label>
+										<input type="radio" name="type" value="jpg" <?php echo $this->settings['type'] == 'jpg' ? 'checked' : '' ?>> jpg
+									</label>
+								</td>
+							</tr>
+						</table>
+						<p class="submit"><input type="submit" class="button button-primary button-large" value="<?php _e( 'Save', 'pdf-thumbnail-generator' ) ?>"></p>
+					</form>
+
+					<h3><?php esc_html_e( 'Generate thumbnails for already uploaded PDFs', 'pdf-thumbnail-generator' ) ?></h3>
+
+					<p><?php esc_html_e( 'If you changed some settings, please save them firstly.', 'pdf-thumbnail-generator' ) ?></p>
+
+					<a href="<?php echo add_query_arg( 'generate', 'missing' ) ?>" class="button button-primary">
+						<?php esc_html_e( 'Generate missing PDF thumbnails', 'pdf-thumbnail-generator' ) ?>
+					</a>
+					&emsp;
+					<a href="<?php echo add_query_arg( 'generate', 'all' ) ?>" class="button button-primary">
+						<?php esc_html_e( 'Regenerate all PDF thumbnails', 'pdf-thumbnail-generator' ) ?>
+					</a>
+				</div><?php
+			}
+		}
+
+		function generate_thumbnail( $pdf_id, $regenerate = false ){
+			if( get_post_mime_type( $pdf_id ) === 'application/pdf' ){
+				$regenerate = true;
+				$thumbnail = get_post_meta( $pdf_id, '_pdf_thumbnail', true );
+				if( $thumbnail ){
+					if( $regenerate ){
+						$this->delete( $pdf_id );
+					}else{
+						return false;
+					}
+				}
+
+				set_time_limit( 0 );
+
+				$max_width = apply_filters( 'pdf_thumbnail_max_width', $this->settings['max_width'], $pdf_id );
+				$max_width = intval( $max_width );
+				$max_height = apply_filters( 'pdf_thumbnail_max_height', $this->settings['max_height'], $pdf_id );
+				$max_height = intval( $max_height );
+				$quality = apply_filters( 'pdf_thumbnail_quality', $this->settings['quality'], $pdf_id );
+				$quality = intval( $quality );
+				$type = apply_filters( 'pdf_thumbnail_type', $this->settings['type'], $pdf_id );
+				$type = $type == 'jpg' ? 'jpg' : 'png';
+
+				$page_number = apply_filters( 'pdf_thumbnail_page_number', 0, $pdf_id );
+				$page_number = intval( $page_number );
+
+				$resolution = ceil( max( $max_height, $max_width ) * 0.16 );
+
+				$bgcolor = apply_filters( 'pdf_thumbnail_bgcolor', 'white', $pdf_id );
+
+				$filepath = get_attached_file( $pdf_id );
+
+				$new_filename = sanitize_file_name( basename( $filepath ) . '.' . $type );
+				$new_filename = wp_unique_filename( dirname( $filepath ), $new_filename );
+				$new_filename = apply_filters( 'pdf_thumbnail_filename', $new_filename, $pdf_id );
+
+				$new_filepath = str_replace( basename( $filepath ), $new_filename, $filepath );
+
+				try{
+					$imagick = new Imagick();
+					$imagick->setResolution( $resolution, $resolution );
+					$imagick->readimage( $filepath . '[' . $page_number . ']' );
+					$imagick->setCompressionQuality( $quality );
+					$imagick->scaleImage( $max_width, $max_height, true );
+					$imagick->setImageFormat( $type ); 
+					$imagick->setImageBackgroundColor( $bgcolor );
+					if( method_exists( 'Imagick', 'setImageAlphaChannel' ) ){
+						if( defined('Imagick::ALPHACHANNEL_REMOVE') ){
+							$imagick->setImageAlphaChannel( Imagick::ALPHACHANNEL_REMOVE );
+						}else{
+							$imagick->setImageAlphaChannel( 11 );
+						}
+					}
+					if( method_exists( 'Imagick','mergeImageLayers' ) ){
+						$imagick->mergeImageLayers( Imagick::LAYERMETHOD_FLATTEN );
+					}else{
+						$imagick = $imagick->flattenImages();
+					}
+					$imagick = apply_filters( 'pdf_thumbnail_imagick', $imagick, $pdf_id );
+					$imagick->stripImage();
+					$imagick->writeImage( $new_filepath );
+					$imagick->clear();
+					update_post_meta( $pdf_id, '_pdf_thumbnail', $new_filename );
+					do_action( 'pdf_thumbnail_generated', $new_filepath, $pdf_id );
+				}catch( ImagickException $err ){
+					error_log( $err );
+				}catch( Exception $err ){
+					error_log( $err );
+				}
+
+				return true;
+			}
+		}
+
+		function wp_mime_type_icon( $icon, $mime, $pdf_id ){
+			if( $mime === 'application/pdf' && strpos( $_SERVER['REQUEST_URI'], '/wp-admin/upload.php' ) === false ){
+				$thumbnail_url = $this->get_url( $pdf_id );
+				if( $thumbnail_url ){
+					return $thumbnail_url;
+				}
+			}
+			return $icon;
+		}
+
+		function delete( $pdf_id ){
+			if( get_post_mime_type( $pdf_id ) === 'application/pdf' ){
+				$thumbnail_filepath = $this->get_path( $pdf_id );
+				if( $thumbnail_filepath ){
+					unlink( $thumbnail_filepath );
+				}
+			}
+		}
+
+		function get_path( $pdf_id ){
+			if( get_post_mime_type( $pdf_id ) === 'application/pdf' ){
+				$thumbnail = get_post_meta( $pdf_id, '_pdf_thumbnail', true );
+				if( $thumbnail ){
+					$filepath = get_attached_file( $pdf_id );
+					$thumbnail_filepath = str_replace( basename( $filepath ), $thumbnail, $filepath );
+					if( file_exists( $thumbnail_filepath ) ){
+						return $thumbnail_filepath;
+					}
+				}
+			}
+			return false;
+		}
+
+		function get_url( $pdf_id ){
+			if( get_post_mime_type( $pdf_id ) === 'application/pdf' ){
+				$thumbnail = get_post_meta( $pdf_id, '_pdf_thumbnail', true );
+				if( $thumbnail ){
+					$filepath = get_attached_file( $pdf_id );
+					$thumbnail_filepath = str_replace( basename( $filepath ), $thumbnail, $filepath );
+					if( file_exists( $thumbnail_filepath ) ){
+						$thumbnail_url = wp_get_attachment_url( $pdf_id );
+						return str_replace( basename( $filepath ), $thumbnail, $thumbnail_url );
+					}
+				}
+			}
+			return false;
+		}
+
+	}
+
+	$pdf_thumbnail = new pdf_thumbnail_generator();
+	register_activation_hook( __FILE__, array( $pdf_thumbnail, 'activate' ) );
+
+	if( ! function_exists('get_pdf_thumbnail_url') ){
+		function get_pdf_thumbnail_url( $pdf_id ){
+			global $pdf_thumbnail;
+			return $pdf_thumbnail->get_url( $pdf_id );
+		}
+	}
+
+	if( ! function_exists('get_pdf_thumbnail_path') ){
+		function get_pdf_thumbnail_path( $pdf_id ){
+			global $pdf_thumbnail;
+			return $pdf_thumbnail->get_path( $pdf_id );
+		}
+	}
+
+	if( ! function_exists('get_pdf_thumbnail_image_src') ){
+		function get_pdf_thumbnail_image_src( $pdf_id ){
+			global $pdf_thumbnail;
+			$data = false;
+			$thumbnail_url = $pdf_thumbnail->get_url( $pdf_id );
+			if( $thumbnail_url ){
+				$thumbnail_path = $pdf_thumbnail->get_path( $pdf_id );
+				$info = getimagesize( $thumbnail_path );
+				$data = array( $thumbnail_url, $info[0], $info[1] );
+			}
+			return $data;
+		}
+	}
+
+	if( ! function_exists('get_pdf_thumbnail_image') ){
+		function get_pdf_thumbnail_image( $pdf_id ){
+			global $pdf_thumbnail;
+			$html = '';
+			$thumbnail_url = $pdf_thumbnail->get_url( $pdf_id );
+			if( $thumbnail_url ){
+				$thumbnail_path = $pdf_thumbnail->get_path( $pdf_id );
+				$info = getimagesize( $thumbnail_path );
+				$default_attr = array(
+					'src' => $thumbnail_url,
+					'class' => 'pdf-thumbnail',
+					'alt' => esc_attr( trim( get_the_title( $pdf_id ) ) ),
+					'width' => $info[0],
+					'height' => $info[1],
+				);
+		
+				if( wp_lazy_loading_enabled( 'img', 'wp_get_attachment_image' ) ){
+					$default_attr['loading'] = wp_get_loading_attr_default('wp_get_attachment_image');
+				}
+		
+				if( array_key_exists( 'loading', $default_attr ) && ! $default_attr['loading'] ){
+					unset( $default_attr['loading'] );
+				}
+
+				$attr = apply_filters( 'get_pdf_thumbnail_image_attributes', $default_attr, $pdf_id );
+		
+				$attr = array_map( 'esc_attr', $attr );
+				$html = '<img';
+		
+				foreach( $attr as $name => $value ){
+					$html .= ' ' . $name . '="' . $value . '"';
+				}
+		
+				$html .= '>';
+			}
+			return $html;
+		}
+	}
+}
\ No newline at end of file

+=== PDF Thumbnail Generator ===
+Contributors: kubiq
+Donate link: https://www.paypal.me/jakubnovaksl
+Tags: pdf, image, thumbnail, generator, creator
+Requires at least: 3.0.1
+Requires PHP: 5.6
+Tested up to: 6.4
+Stable tag: 1.1
+License: GPLv2 or later
+License URI: http://www.gnu.org/licenses/gpl-2.0.html
+
+Generates thumbnail for PDF files
+
+
+== Description ==
+
+Generates thumbnail for PDF file automatically after file is uploaded to the Media library.
+
+You can also generate thumbnails for old PDF files that are already in the Media library - you can generate missing thumbnails or regenerate all thumbnails.
+
+<strong>Imagick library must be installed on your server, otherwise this plugin will not work</strong>
+
+<ul>
+	<li>automated test after plugin activation to make sure it will work on your server</li>
+	<li>works with all types of WordPress installations: domain, subdomain, subdirectory, multisite/network</li>
+	<li>works on Apache and NGiNX</li>
+	<li>automatically generate thumbnail for new uploaded PDFs</li>
+	<li>(re)generate thumbnails for existing PDFs in Media library</li>
+	<li>set maximum width of PDF thumbnail</li>
+	<li>set maximum height of PDF thumbnail</li>
+	<li>set image quality of PDF thumbnail</li>
+	<li>set image file type of PDF thumbnail</li>
+</ul>
+
+## Shortcodes
+
+### pdf_thumbnail
+Maybe you want to display PDF thumbnail by using a shortcode
+
+`[pdf_thumbnail id="123"]`
+
+### pdf_thumbnail_url
+Maybe you want to display PDF thumbnail url by using a shortcode
+
+`[pdf_thumbnail_url id="123"]`
+ 
+## Functions
+
+### get_pdf_thumbnail_url
+If you want to return PDF thumbnail URL you can use
+
+`get_pdf_thumbnail_url( $pdf_id )`
+
+it works similar to `wp_get_attachment_url` and it will return something like
+
+`https://site.com/wp-content/uploads/2022/01/example.pdf.png`
+
+### get_pdf_thumbnail_path
+If you want to return PDF thumbnail URL you can use
+
+`get_pdf_thumbnail_path( $pdf_id )`
+
+it works similar to `get_attached_file` and it will return something like
+
+`/www/site.com/wp-content/uploads/2022/01/example.pdf.png`
+
+### get_pdf_thumbnail_image_src
+If you want to return PDF thumbnail url, width and height you can use
+
+`get_pdf_thumbnail_image_src( $pdf_id )`
+
+it works similar to `wp_get_attachment_image_src` and it will return something like
+
+`[
+	0 => 'https://site.com/wp-content/uploads/2022/01/example.pdf.png',
+	1 => 600,
+	2 => 800
+]`
+
+### get_pdf_thumbnail_image
+If you want to return PDF thumbnail image tag you can use
+
+`get_pdf_thumbnail_image( $pdf_id )`
+
+it works similar to `wp_get_attachment_image` and it will return something like
+
+`<img src="https://site.com/wp-content/uploads/2022/01/example.pdf.png" width="600" height="800" alt="example" loading="lazy">`
+ 
+## Hooks
+
+### pdf_thumbnail_max_width
+Maybe you want to change global PDF thumbnail max_width for a specific PDF file
+
+`add_filter( 'pdf_thumbnail_max_width', function( $max_width, $pdf_id ){
+	if( $pdf_id == 123 ){
+		return 1024;
+	}
+	return $max_width;
+}, 10, 2 );`
+
+### pdf_thumbnail_max_height
+Maybe you want to change global PDF thumbnail max_width for a specific PDF file
+
+`add_filter( 'pdf_thumbnail_max_height', function( $max_height, $pdf_id ){
+	if( $pdf_id == 123 ){
+		return 768;
+	}
+	return $max_height;
+}, 10, 2 );`
+
+### pdf_thumbnail_quality
+Maybe you want to change global PDF thumbnail quality for a specific PDF file
+
+`add_filter( 'pdf_thumbnail_quality', function( $quality, $pdf_id ){
+	if( $pdf_id == 123 ){
+		return 100;
+	}
+	return $quality;
+}, 10, 2 );`
+
+### pdf_thumbnail_type
+Maybe you want to change global PDF thumbnail file type for a specific PDF file
+
+`add_filter( 'pdf_thumbnail_type', function( $type, $pdf_id ){
+	if( $pdf_id == 123 ){
+		return 'png'; // or 'jpg'
+	}
+	return $type;
+}, 10, 2 );`
+
+### pdf_thumbnail_bgcolor
+Maybe you want to change default PDF thumbnail background for a specific PDF file
+
+`add_filter( 'pdf_thumbnail_bgcolor', function( $bgcolor, $pdf_id ){
+	if( $pdf_id == 123 ){
+		return 'black'; // default is 'white'
+	}
+	return $bgcolor;
+}, 10, 2 );`
+
+### pdf_thumbnail_page_number
+Maybe you want to PDF thumbnail page number for a specific PDF file
+
+`add_filter( 'pdf_thumbnail_page_number', function( $page, $pdf_id ){
+	if( $pdf_id == 123 ){
+		return 1; // default is 0
+	}
+	return $page;
+}, 10, 2 );`
+
+### pdf_thumbnail_filename
+Maybe you want to PDF thumbnail filename for a specific PDF file
+
+`add_filter( 'pdf_thumbnail_filename', function( $filename, $pdf_id ){
+	if( $pdf_id == 123 ){
+		return str_replace( '.pdf.png', '.png', $filename );
+	}
+	return $filename;
+}, 10, 2 );`
+
+### pdf_thumbnail_imagick
+Maybe you want to add watermark to PDF thumbnail for a specific PDF file
+
+`add_filter( 'pdf_thumbnail_imagick', function( $imagick, $pdf_id ){
+	if( $pdf_id == 123 ){
+		// add your watermark here
+	}
+	return $imagick;
+}, 10, 2 );`
+
+### get_pdf_thumbnail_image_attributes
+Maybe you want to change attributes for image tag from `get_pdf_thumbnail_image` function
+
+`add_filter( 'get_pdf_thumbnail_image_attributes', function( $attr, $pdf_id ){
+	$attr['loading'] = 'eager';
+	return $attr;
+}, 10, 2 );`
+
+### pdf_thumbnail_generated
+Maybe you want to do something after the thumbnail is generated
+
+`add_action( 'pdf_thumbnail_generated', function( $thumbnail_path, $pdf_id ){
+	// do somthing with the local file $thumbnail_path
+}, 10, 2 );`
+
+
+== Installation ==
+
+1. Upload `pdf-thumbnail-generator` directory to the `/wp-content/plugins/` directory
+2. Activate the plugin through the 'Plugins' menu in WordPress
+
+
+== Frequently Asked Questions ==
+
+= Plugin requirements =
+
+PHP 5.6 or higher
+Imagick extension
+
+= PDF thumbnails stored location =
+
+PDF thumbnails are generated in the same directory as original PDF file. Example:
+pdf file: `/wp-content/uploads/2022/01/example.pdf`
+thumbnail: `/wp-content/uploads/2022/01/example.pdf.png`
+
+
+== Changelog ==
+
+= 1.1 =
+* tested on WP 6.4
+
+= 1.0 =
+* First version
\ No newline at end of file