Add files via upload

Author: kuopassa

kuo_webp_v0.1.php

@@ -0,0 +1,342 @@
+<?php
+
+// This is a PLUGIN TEMPLATE for Textpattern CMS.
+
+// Copy this file to a new name like abc_myplugin.php.  Edit the code, then
+// run this file at the command line to produce a plugin for distribution:
+// $ php abc_myplugin.php > abc_myplugin-0.1.txt
+
+// Plugin name is optional.  If unset, it will be extracted from the current
+// file name. Plugin names should start with a three letter prefix which is
+// unique and reserved for each plugin author ("abc" is just an example).
+// Uncomment and edit this line to override:
+$plugin['name'] = 'kuo_webp';
+
+// Allow raw HTML help, as opposed to Textile.
+// 0 = Plugin help is in Textile format, no raw HTML allowed (default).
+// 1 = Plugin help is in raw HTML.  Not recommended.
+# $plugin['allow_html_help'] = 1;
+
+$plugin['version'] = '0.1';
+$plugin['author'] = 'Pete';
+$plugin['author_uri'] = 'https://textpattern.fi/';
+$plugin['description'] = 'Create WebP versions of images.';
+
+// Plugin load order:
+// The default value of 5 would fit most plugins, while for instance comment
+// spam evaluators or URL redirectors would probably want to run earlier
+// (1...4) to prepare the environment for everything else that follows.
+// Values 6...9 should be considered for plugins which would work late.
+// This order is user-overrideable.
+$plugin['order'] = '9';
+
+// Plugin 'type' defines where the plugin is loaded
+// 0 = public              : only on the public side of the website (default)
+// 1 = public+admin        : on both the public and admin side
+// 2 = library             : only when include_plugin() or require_plugin() is called
+// 3 = admin               : only on the admin side (no AJAX)
+// 4 = admin+ajax          : only on the admin side (AJAX supported)
+// 5 = public+admin+ajax   : on both the public and admin side (AJAX supported)
+$plugin['type'] = '3';
+
+// Plugin "flags" signal the presence of optional capabilities to the core plugin loader.
+// Use an appropriately OR-ed combination of these flags.
+// The four high-order bits 0xf000 are available for this plugin's private use
+if (!defined('PLUGIN_HAS_PREFS')) define('PLUGIN_HAS_PREFS', 0x0001); // This plugin wants to receive "plugin_prefs.{$plugin['name']}" events
+if (!defined('PLUGIN_LIFECYCLE_NOTIFY')) define('PLUGIN_LIFECYCLE_NOTIFY', 0x0002); // This plugin wants to receive "plugin_lifecycle.{$plugin['name']}" events
+
+$plugin['flags'] = '0';
+
+// Plugin 'textpack' is optional. It provides i18n strings to be used in conjunction with gTxt().
+// Syntax:
+// ## arbitrary comment
+// #@event
+// #@language ISO-LANGUAGE-CODE
+// abc_string_name => Localized String
+
+/** Uncomment me, if you need a textpack
+$plugin['textpack'] = <<< EOT
+#@admin
+#@language en-gb
+abc_sample_string => Sample String
+abc_one_more => One more
+#@language de-de
+abc_sample_string => Beispieltext
+abc_one_more => Noch einer
+EOT;
+**/
+// End of textpack
+
+if (!defined('txpinterface'))
+        @include_once('zem_tpl.php');
+
+# --- BEGIN PLUGIN CODE ---
+register_callback(
+	'kuo_webp_cta',
+	'image_ui',
+	'image_edit'
+);
+
+register_callback(
+	'kuo_webp_launcher',
+	'image_ui',
+	'image_edit'
+);
+
+function kuo_webp_cta() {
+
+	global $img_dir;
+	
+	$result = array();
+	
+	$image = safe_row(
+		'*',
+		'txp_image',
+		'id = '.intval($_GET['id']),
+		false
+	);
+	
+	if (strcmp($image['ext'],'.webp') != 0) {
+		
+		$result[] = href(
+			'💾 WebP',
+			'?event=image&step=image_edit&id='.$_GET['id'].'&action=webp',
+			'title="&#10227; Create or recreate WebP files"'
+		);
+	}
+	
+	$webp = array(
+		'full'=>IMPATH.$image['id'].'.webp',
+		'thumbnail'=>IMPATH.$image['id'].'t.webp',
+	);
+	
+	if (file_exists($webp['full'])) {
+		
+		$result[] = href(
+			'🖼 Full size',
+			ihu.$img_dir.'/'.$image['id'].'.webp',
+			'target="_new" rel="prefetch"'
+		);
+	}
+	
+	if (file_exists($webp['thumbnail'])) {
+		
+		$result[] = href(
+			'🖼 Thumbnail',
+			ihu.$img_dir.'/'.$image['id'].'t.webp',
+			'target="_new"'
+		);
+	}
+	
+	echo implode(
+		'&nbsp;&nbsp;&nbsp;',
+		$result
+	);
+}
+
+function kuo_webp_launcher() {
+
+	$image = safe_row(
+		'*',
+		'txp_image',
+		'id = '.intval($_GET['id']),
+		false
+	);
+
+	if (
+		(isset($_GET['action']))
+		&&
+		(strcmp($_GET['action'],'webp') == 0)
+		&&
+		(!empty($image))
+	) {
+		
+		$source['full'] = IMPATH.$image['id'].$image['ext'];
+		$new['full'] = IMPATH.kuo_extension_changer($image['id'].$image['ext']);
+		
+		$type = kuo_image_type($source['full']);
+		$isAcceptedType = kuo_is_accepted_type($type);
+		
+		# Copying the original image.
+		if ($isAcceptedType) {
+			
+			kuo_webp_processor(
+				$type,
+				$source['full'],
+				$new['full']
+			);
+		}
+		
+		if (
+			(isset($image['thumbnail']))
+			&&
+			($image['thumbnail'] == 1)
+		) {
+			
+			$source['thumbnail'] = IMPATH.$image['id'].'t'.$image['ext'];
+			$new['thumbnail'] = IMPATH.kuo_extension_changer($image['id'].'t'.$image['ext']);
+		}
+		
+		# Optionally copying the thumbnail.
+		if (isset($new['thumbnail'],$source['thumbnail'])) {
+			
+			$type = kuo_image_type($source['thumbnail']);
+			$isAcceptedType = kuo_is_accepted_type($type);
+			
+			if ($isAcceptedType) {
+				
+				kuo_webp_processor(
+					$type,
+					$source['thumbnail'],
+					$new['thumbnail']
+				);
+			}
+		}
+		
+		if (!headers_sent()) {
+			
+			header('Location: ?event=image&step=image_edit&id='.$_GET['id']);
+		}
+	}
+}
+
+function kuo_image_type(string $file):string {
+
+	$result = '';
+	
+	$image = getimagesize($file);
+	
+	if (isset($image['mime'])) {
+	
+		$result = $image['mime'];
+		$result = strtolower($result);
+	}
+
+	return $result;
+}
+
+function kuo_is_accepted_type(string $type):bool {
+
+	$result = false;
+	
+	static $accepted = array(
+		'image/avif',
+		'image/bmp',
+		'image/gif',
+		'image/jpg',
+		'image/jpeg',
+		'image/png',
+		'image/tga',
+	);
+
+	if (in_array($type,$accepted,true)) {
+	
+		$result = true;
+	}
+
+	return $result;
+}
+
+function kuo_extension_changer(string $file,string $extension = 'webp'):string {
+
+	$name = pathinfo(
+		$file,
+		PATHINFO_FILENAME
+	);
+	
+	return $name.'.'.$extension;
+}
+
+function kuo_webp_processor(string $type,string $original,string $new):bool {
+
+	$result = false;
+
+	if (
+		(strcmp($type,'image/avif') == 0)
+		&&
+		(function_exists('imagecreatefromavif'))
+	) {
+
+		$image = imagecreatefromavif($original);
+	}
+	elseif (
+		(strcmp($type,'image/bmp') == 0)
+		&&
+		(function_exists('imagecreatefrombmp'))
+	) {
+	
+		$image = imagecreatefrombmp($original);
+	}
+	elseif (
+		(strcmp($type,'image/gif') == 0)
+		&&
+		(function_exists('imagecreatefromgif'))
+	) {
+	
+		$image = imagecreatefromgif($original);
+	}
+	elseif (
+		(in_array($type,array('image/jpg','image/jpeg'),true))
+		&&
+		(function_exists('imagecreatefromjpeg'))
+	) {
+	
+		$image = imagecreatefromjpeg($original);
+	}
+	elseif (
+		(strcmp($type,'image/png') == 0)
+		&&
+		(function_exists('imagecreatefrompng'))
+	) {
+	
+		$image = imagecreatefrompng($original);
+	}
+	elseif (
+		(strcmp($type,'image/tga') == 0)
+		&&
+		(function_exists('imagecreatefromtga'))
+	) {
+	
+		$image = imagecreatefromtga($original);
+	}
+	
+	if (
+		(isset($image))
+		&&
+		(is_resource($image))
+	) {
+		
+		imagepalettetotruecolor($image);
+		
+		imagealphablending(
+			$image,
+			true
+		);
+		
+		imagesavealpha(
+			$image,
+			true
+		);
+		
+		imagewebp(
+			$image,
+			$new,
+			100
+		);
+		
+		$result = imagedestroy($image);
+	}
+	
+	return $result;
+}
+# --- END PLUGIN CODE ---
+if (0) {
+?>
+<!--
+# --- BEGIN PLUGIN HELP ---
+Original image file and thumbnail of it can be copied in WebP format.
+# --- END PLUGIN HELP ---
+-->
+<?php
+}
+?>