Additional updates to PR #141 expanding WEBP support

wire/core/ImageSizer.php

@@ -55,6 +55,14 @@ class ImageSizer extends Wire {
 	 */
 	static protected $knownEngines = null;
 
+	/**
+	 * Names of engines that failed the supported() checks
+	 * 
+	 * @var array
+	 * 
+	 */
+	protected $failedEngineNames = array();
+
 	/**
 	 * Module/class name of engine that must only be used (for cases where you want to force a specific engine)
 	 * 
@@ -84,7 +92,6 @@ class ImageSizer extends Wire {
 	 * 
 	 * @param string $filename Filename to resize. Omit only if instantiating class for a getEngines() call.
 	 * @param array $options Initial options to the engine.
-	 * @throws WireException
 	 *
 	 */
 	public function __construct($filename = '', $options = array()) {
@@ -152,21 +159,50 @@ class ImageSizer extends Wire {
 		}
 		
 		$engine = null;
+		$bestFallbackEngine = null; // first engine that was supported but failed webp check
+		$engineNames = $this->getEngines();
+		$engineNames[] = $this->defaultEngineName;
 	
 		// find first supported engine, according to knownEngines priority
-		foreach($this->getEngines() as $engineName) {
+		foreach($engineNames as $engineName) {
+			
 			if($this->forceEngineName && $engineName != $this->forceEngineName) continue;
-			$e = $this->wire('modules')->get($engineName);
+			
+			if($engineName === $this->defaultEngineName) {
+				$engineClass = __NAMESPACE__ . "\\$engineName";
+				$e = $this->wire(new $engineClass());
+			} else {
+				$e = $this->wire('modules')->get($engineName);
+			}
+			
+			if(!$e) continue;
+			
+			/** @var ImageSizerEngine $e */
 			$e->prepare($filename, $options, $inspectionResult);	
-			if($e->supported()) {
+			$supported = $e->supported();
+			
+			if($supported && !empty($options['webpAdd']) && !$e->supported('webp')) {
+				// engine does not support requested webp extra image
+				if(!$bestFallbackEngine) $bestFallbackEngine = $e;
+				
+			} else if($supported) {
+				// found supported engine
 				$engine = $e;
 				break;
-			}
+			} 
+			
+			$this->failedEngineNames[$engineName] = $engineName;
 		}
 		
-		if(!$engine) {
-			// fallback to default
-			$engine = $this->newDefaultImageSizerEngine($filename, $options, $inspectionResult);
+		if(!$engine) { 
+			// no engine found
+			if($bestFallbackEngine) {
+				// if there is a next best fallback, use it
+				$engine = $bestFallbackEngine;
+			} else {
+				// otherwise fallback to default
+				$engine = $this->newDefaultImageSizerEngine($filename, $options, $inspectionResult);
+			}
 		}
 		
 		return $engine;
@@ -294,11 +330,10 @@ class ImageSizer extends Wire {
 	 * 
 	 */
 	public function setModified($modified) {
-		if($this->engine) $this->engine->modified = $modified ? true : false;
+		if($this->engine) $this->engine->setModified($modified ? true : false);
 		return $this;
 	}
 
-	// setters (@todo phpdocs)
 	public function setAutoRotation($value = true) { return $this->setOptions(array('autoRotation', $value)); }
 	public function setCropExtra($value) { return $this->setOptions(array('cropExtra', $value)); }
 	public function setCropping($cropping = true) { return $this->setOptions(array('cropping', $cropping)); }
@@ -312,7 +347,6 @@ class ImageSizer extends Wire {
 	public function setTimeLimit($value = 30) { return $this->setOptions(array('timeLimit', $value)); }
 	public function setUpscaling($value = true) { return $this->setOptions(array('upscaling', $value)); }
 	public function setUseUSM($value = true) { return $this->setOptions(array('useUSM', $value)); }
-
 	public function getWidth() { 
 		$image = $this->getEngine()->get('image');
 		return $image['width']; 
@@ -321,12 +355,12 @@ class ImageSizer extends Wire {
 		$image = $this->getEngine()->get('image');
 		return $image['height']; 
 	}
-	
-	public function getFilename() { return $this->getEngine()->filename; }
-	public function getExtension() { return $this->getEngine()->extension; }
-	public function getImageType() { return $this->getEngine()->imageType; }
-	public function isModified() { return $this->getEngine()->modified; }
+	public function getFilename() { return $this->getEngine()->getFilename(); }
+	public function getExtension() { return $this->getEngine()->getExtension(); }
+	public function getImageType() { return $this->getEngine()->getImageType(); }
+	public function isModified() { return $this->getEngine()->getModified(); }
 	public function getOptions() { return $this->getEngine()->getOptions(); }
+	public function getFailedEngineNames() { return $this->failedEngineNames; }
 
 	/**
 	 * Get the current ImageSizerEngine
@@ -533,7 +567,7 @@ class ImageSizer extends Wire {
 		} else {
 			return null;
 		}
-		$sizer = new ImageSizerEngineGD($filename);
+		$sizer = new ImageSizerEngineGD();
 		if($wire) $wire->wire($sizer);
 		$result = false !== $sizer->writeBackIPTC($filename) ? true : false;
 		return $result;

wire/core/ImageSizerEngine.php

@@ -21,6 +21,7 @@
  * @property bool $webpAdd
  * @property int $webpQuality
  * @property bool|null $webpResult
+ * @property bool|null $webpOnly
  * 
  */
 abstract class ImageSizerEngine extends WireData implements Module, ConfigurableModule {
@@ -79,6 +80,14 @@ abstract class ImageSizerEngine extends WireData implements Module, Configurable
 	 */
 	protected $webpAdd = false;
 
+	/**
+	 * Only create the webp file?
+	 * 
+	 * @var bool
+	 * 
+	 */
+	protected $webpOnly = false;
+
 	/**
 	 * webp result (null=not known or not applicable)
 	 * 
@@ -931,13 +940,27 @@ abstract class ImageSizerEngine extends WireData implements Module, Configurable
 	/**
 	 * Set flag to also create a webp file or not
 	 *
-	 * @param bool $value
-	 *
+	 * @param bool $webpAdd
+	 * @param bool|null $webpOnly
 	 * @return self
 	 *
 	 */
-	public function setWebpAdd($value) {
-		$this->webpAdd = (bool) $value;
+	public function setWebpAdd($webpAdd, $webpOnly = null) {
+		$this->webpAdd = (bool) $webpAdd;
+		if(is_bool($webpOnly)) $this->webpOnly = $webpOnly;
+		return $this;
+	}
+
+	/**
+	 * Set flag to only create a webp file
+	 *
+	 * @param bool value$
+	 * @return self
+	 *
+	 */
+	public function setWebpOnly($value) {
+		$this->webpOnly = (bool) $value;
+		if($this->webpOnly) $this->webpAdd = true; // webpAdd required for webpOnly
 		return $this;
 	}
 
@@ -1207,6 +1230,9 @@ abstract class ImageSizerEngine extends WireData implements Module, Configurable
 				case 'webpAdd':
 					$this->setWebpAdd($value);
 					break;
+				case 'webpOnly':
+					$this->webpOnly = (bool) $value;
+					break;
 				case 'cropping':
 					$this->setCropping($value);
 					break;
@@ -1287,6 +1313,7 @@ abstract class ImageSizerEngine extends WireData implements Module, Configurable
 			'quality' => $this->quality,
 			'webpQuality' => $this->webpQuality,
 			'webpAdd' => $this->webpAdd,
+			'webpOnly' => $this->webpOnly,
 			'cropping' => $this->cropping,
 			'upscaling' => $this->upscaling,
 			'interlace' => $this->interlace, 
@@ -1328,6 +1355,7 @@ abstract class ImageSizerEngine extends WireData implements Module, Configurable
 		);
 
 		if($key === 'webpResult') return $this->webpResult;
+		if($key === 'webpOnly') return $this->webpOnly;
 		if(in_array($key, $keys)) return $this->$key;
 		if(in_array($key, $this->optionNames)) return $this->$key;
 		if(isset($this->options[$key])) return $this->options[$key];
@@ -1476,6 +1504,16 @@ abstract class ImageSizerEngine extends WireData implements Module, Configurable
 		return $this;
 	}
 
+	/**
+	 * Get whether the image was modified
+	 * 
+	 * @return bool
+	 * 
+	 */
+	public function getModified() {
+		return $this->modified;
+	}
+
 	/**
 	 * Check if cropping is needed, if yes, populate x- and y-position to params $w1 and $h1
 	 *

wire/core/ImageSizerEngineGD.php

@@ -36,14 +36,6 @@ class ImageSizerEngineGD extends ImageSizerEngine {
 	 */
 	protected $gammaLinearized;
 
-	/**
-	 * webp-only toggle for future use
-	 * 
-	 * @var bool
-	 * 
-	 */
-	protected $webpOnly = false;
-
 	/**
 	 * Webp support available?
 	 * 

wire/core/PagefileExtra.php

@@ -2,7 +2,9 @@
 
 /**
  * Extra extension for Pagefile or Pageimage objects
- * 
+ *
+ * Properties 
+ * ==========
  * @property string $url Local URL/path to file 
  * @property string $httpUrl Full HTTP URL with scheme and host
  * @property string $URL No-cache version of url
@@ -14,9 +16,16 @@
  * @property string $ext Alias of extension
  * @property bool $exists Does the file exist?
  * @property int $filesize Size of file in bytes
- * @property Pageimage $pagefile Source Pageimage objerct
+ * @property Pagefile|Pageimage $pagefile Source Pageimage object
  * 
- * @method create()
+ * The following properties affect the behavior of the URL-related methods
+ * =======================================================================
+ * @property bool $useSrcUrlOnFail Use source Pagefile URL if extra image does not exist and cannot be created? (default=false)
+ * @property bool $useSrcUrlOnSize Use source Pagefile URL if extra file is larger than source file? (default=false)
+ *
+ * Hookable methods 
+ * ================
+ * @method bool create()
  * 
  */
 
@@ -41,7 +50,7 @@ class PagefileExtra extends WireData {
 	 * 
 	 */
 	protected $filenamePrevious = '';
-
+	
 	/**
 	 * Construct
 	 *
@@ -53,6 +62,8 @@ class PagefileExtra extends WireData {
 		$pagefile->wire($this);	
 		$this->setPagefile($pagefile);
 		$this->setExtension($extension);
+		$this->useSrcUrlOnFail = true;
+		$this->useSrcUrlOnSize = false;
 		return parent::__construct();
 	}
 
@@ -79,10 +90,12 @@ class PagefileExtra extends WireData {
 	/**
 	 * Does the extra file currently exist?
 	 * 
+	 * @param bool $clear Clear stat cache before checking? (default=false)
 	 * @return bool
 	 * 
 	 */
-	public function exists() {
+	public function exists($clear = false) {
+		if($clear) clearstatcache();
 		return is_readable($this->filename());
 	}
 
@@ -93,7 +106,7 @@ class PagefileExtra extends WireData {
 	 * 
 	 */
 	public function filesize() {
-		return $this->exists() ? filesize($this->filename()) : 0;
+		return (int) @filesize($this->filename());
 	}
 
 	/**
@@ -122,13 +135,26 @@ class PagefileExtra extends WireData {
 	/**
 	 * Return the URL to the extra file, creating it if it does not already exist
 	 * 
+	 * @param bool $fallback Allow falling back to source Pagefile URL when appropriate?
 	 * @return string
 	 * 
 	 */
-	public function url() {
-		if(!$this->exists()) $this->create(); 
-		$pathinfo = pathinfo($this->pagefile->url());
-		return $pathinfo['dirname'] . '/' . $pathinfo['filename'] . '.' . $this->extension;
+	public function url($fallback = true) {
+		if(!$this->exists()) {
+			$this->create(); 
+			if($fallback && !$this->exists() && $this->useSrcUrlOnFail) {
+				// return original pagefile URL if the extra cannot be created
+				return $this->pagefile->url(); 
+			}
+		}
+		if($fallback && $this->useSrcUrlOnSize && $this->filesize() > $this->pagefile->filesize()) {
+			$url = $this->pagefile->url();
+		} else {
+			$pathinfo = pathinfo($this->pagefile->url());
+			$url = $pathinfo['dirname'] . '/' . $pathinfo['filename'] . '.' . $this->extension;
+		}
+		
+		return $url;
 	}
 
 	/**
@@ -169,8 +195,12 @@ class PagefileExtra extends WireData {
 	 * 
 	 * Must be implemented by a hook or by descending class
 	 * 
+	 * @return bool Returns true on success, false on fail
+	 * 
 	 */
-	public function ___create() { }
+	public function ___create() { 
+		return false;
+	}
 
 	/**
 	 * Get property
@@ -212,7 +242,8 @@ class PagefileExtra extends WireData {
 				$value = $this->pagefile;
 				break;
 			default:	
-				$value = $this->pagefile->get($key);
+				$value = parent::get($key);
+				if($value === null) $value = $this->pagefile->get($key);
 		}
 		return $value;
 	}

wire/core/Pageimage.php

@@ -645,7 +645,8 @@ class Pageimage extends Pagefile {
 	 *
 	 */
 	protected function ___size($width, $height, $options) {
-	
+
+		$this->error = '';
 		if($this->ext == 'svg') return $this; 
 
 		if(!is_array($options)) { 
@@ -678,6 +679,8 @@ class Pageimage extends Pagefile {
 			'hidpiQuality' => 40, 
 			'webpQuality' => 90,
 			'webpAdd' => false,
+			'webpName' => '', // use this for the webp file basename rather than mirroring from the jpg/png
+			'webpOnly' => false, // only keep the webp version (requires webpAdd option)
 			'suffix' => array(), // can be array of suffixes or string of 1 suffix
 			'forceNew' => false,  // force it to create new image even if already exists
 			'hidpi' => false, 
@@ -691,8 +694,6 @@ class Pageimage extends Pagefile {
 			'allowOriginal' => false, // Return original image if already at requested dimensions? (must be only specified option)
 			);
 
-		$this->error = '';
-
 		/** @var WireFileTools $files */
 		/** @var Config $config */
 		$files = $this->wire('files');
@@ -786,11 +787,16 @@ class Pageimage extends Pagefile {
 		
 		$filenameFinal = $this->pagefiles->path() . $basename;
 		$filenameFinalExists = file_exists($filenameFinal);
-		$filenameFinalWebp = $this->pagefiles->path() . $basenameNoExt . '.webp';
+		
+		if(!empty($options['webpName'])) {
+			$filenameFinalWebp = $this->pagefiles->path() . basename($options['webpName'], '.webp') . '.webp';
+		} else {
+			$filenameFinalWebp = $this->pagefiles->path() . $basenameNoExt . '.webp';
+		}
 		
 		// force new creation if requested webp copy doesn't exist, (regardless if regular variation exists or not)
 		if($options['webpAdd'] && !file_exists($filenameFinalWebp)) $options['forceNew'] = true;
-
+		
 		// create a new resize if it doesn't already exist or forceNew option is set
 		if(!$filenameFinalExists && !file_exists($this->filename())) {
 			// no original file exists to create variation from 
@@ -801,7 +807,7 @@ class Pageimage extends Pagefile {
 			// filenameUnvalidated is temporary filename used for resize
 			$tempDir = $this->pagefiles->page->filesManager()->getTempPath();
 			$filenameUnvalidated = $tempDir . $basename;
-			$filenameUnvalidatedWebp = $tempDir . basename($filenameFinalWebp);
+			$filenameUnvalidatedWebp = $tempDir . $basenameNoExt . '.webp';
 			
 			if($filenameFinalExists && $options['forceNew']) $files->unlink($filenameFinal, true);
 			if(file_exists($filenameFinalWebp) && $options['forceNew']) $files->unlink($filenameFinalWebp, true);
@@ -822,7 +828,9 @@ class Pageimage extends Pagefile {
 
 					/* if the current engine installation does not support webp, modify the options param */
 					if(!empty($options['webpAdd']) && !$engine->supported('webp')) {
+						// no engines support webp
 						$options['webpAdd'] = false;
+						$options['webpOnly'] = false;
 						$engine->setOptions($options);
 					}
 
@@ -840,7 +848,12 @@ class Pageimage extends Pagefile {
 						}
 					}
 					
-					if($sizer->resize($width, $height) && $files->rename($filenameUnvalidated, $filenameFinal)) {
+					if($sizer->resize($width, $height)) {
+						if($options['webpAdd'] && $options['webpOnly']) {
+							if(is_file($filenameUnvalidated)) $files->unlink($filenameUnvalidated);
+						} else if(!$files->rename($filenameUnvalidated, $filenameFinal)) {
+							$this->error = "Rename failed: $filenameUnvalidated => $filenameFinal";
+						}
 						if($options['webpAdd'] && file_exists($filenameUnvalidatedWebp)) { 
 							$files->rename($filenameUnvalidatedWebp, $filenameFinalWebp);
 						}
@@ -848,7 +861,7 @@ class Pageimage extends Pagefile {
 						$this->error = "ImageSizer::resize($width, $height) failed for $filenameUnvalidated";
 					}
 
-					if($debug) $this->wire('log')->save('image-sizer',
+					if($debug && empty($options['webpOnly'])) $this->wire('log')->save('image-sizer',
 						str_replace('ImageSizerEngine', '', $sizer->getEngine()) . ' ' . 
 						($this->error ? "FAILED Resize: " : "Resized: ") . "$originalName => " . basename($filenameFinal) . " " . 
 						"({$width}x{$height}) " . Debug::timer($timer) . " secs $originalSize => " . filesize($filenameFinal) . " bytes " . 
@@ -1896,6 +1909,8 @@ class Pageimage extends Pagefile {
 		$webp = $this->extras('webp');
 		if(!$webp) {
 			$webp = new PagefileExtra($this, 'webp');
+			$webp->useSrcUrlOnFail = true; // use this pagefile URL instead if we fail to create a webp
+			$webp->useSrcUrlOnSize = true; // use webp URL only if it results in a smaller file
 			$this->extras('webp', $webp);
 			$webp->addHookAfter('create', $this, 'hookWebpCreate'); 
 		}
@@ -1911,13 +1926,30 @@ class Pageimage extends Pagefile {
 	 * 
 	 */
 	public function hookWebpCreate(HookEvent $event) {
-		if(!$this->original) return;
+		$original = $this->original;
 		/** @var PagefileExtra $webp */
 		$webp = $event->object;
 		$webp->unlink();
-		$options = self::$lastSizeOptions;
+		if($original) {
+			// we are in an image resized from an original
+			$options = self::$lastSizeOptions;
+			$width = $options['_width'];
+			$height = $options['_height'];
+		} else {
+			// we are the original
+			// create a file with same name as original but with .webp extension
+			$original = $this;
+			$options = array(
+				'allowOriginal' => false, 
+				'webpName' => basename($this->basename(), ".$this->ext"),
+				'webpOnly' => true
+			);
+			$width = $this->width;
+			$height = 0;
+		}
 		$options['webpAdd'] = true;
-		$this->original->size($options['_width'], $options['_height'], $options);
+		$original->size($width, $height, $options);
+		$event->return = empty($this->error); 
 	}
 	
 	/**

wire/core/PageimageDebugInfo.php

@@ -275,7 +275,7 @@ class PageimageDebugInfo extends WireData {
 			$return = $content;
 		} else {
 			// build output for HTML
-			$return = "<pre>" . $this->wire('sanitizer')->entities($content) . "</pre>";
+			$return = "<pre style='overflow:auto'>$content</pre>";
 		}
 
 		return $return;

wire/modules/Image/ImageSizerEngineIMagick/ImageSizerEngineIMagick.module

@@ -36,13 +36,12 @@ class ImageSizerEngineIMagick extends ImageSizerEngine {
 	protected $imWebp = null;
 
 	/**
-	 * Webp support available?
+	 * Static cache of formats and whether or not supported, as used by the supportsFormat() method (RJC)
 	 * 
-	 * @var bool|null
+	 * @var array of ['FORMAT' => true|false]
 	 * 
 	 */
-	static protected $webpSupport = null;
-	
+	static protected $formatSupport = array();
 
 	// @todo the following need phpdoc
 	protected $workspaceColorspace;
@@ -116,7 +115,7 @@ class ImageSizerEngineIMagick extends ImageSizerEngine {
 	 * 
 	 */
 	protected function validSourceImageFormats() {
-		return array('JPG', 'JPEG', 'PNG24');
+		return array('JPG', 'JPEG', 'PNG24', 'PNG8', 'PNG', 'GIF', 'GIF87');
 		//return array(
 		//    'PNG', 'PNG8', 'PNG24',
 		//    'JPG', 'JPEG',
@@ -131,16 +130,33 @@ class ImageSizerEngineIMagick extends ImageSizerEngine {
 	 * 
 	 */
 	protected function validTargetImageFormats() {
-		return $this->validSourceImageFormats();
+		$formats = $this->validSourceImageFormats();
+		if($this->supportsFormat('WEBP')) $formats[] = 'WEBP';
+		return $formats;
+	}
+	
+	/**
+	 * Is the given image format supported by this IMagick for source and target? (RJC)
+	 *
+	 * @param string $format String like png, jpg, jpg, png8, png24, png24-trans, png24-alpha, etc.
+	 * @return bool
+	 *
+	 */
+	public function supportsFormat($format) {
+		if(strpos($format, '-')) list($format,) = explode('-', $format);
+		$format = strtoupper($format);
+		if(isset(self::$formatSupport[$format])) return self::$formatSupport[$format];
+		try {
+			$im = new \IMagick();
+			$formats = $im->queryformats($format);
+			$supported = count($formats) > 0;
+		} catch(\Exception $e) {
+			$supported = false;
+		}
+		self::$formatSupport[$format] = $supported;
+		return $supported;
 	}
 
-	/**
-	 * Is IMagick supported? Is the current image(sub)format supported?
-	 * 
-	 * @param string $action
-	 * @return bool
-	 * 
-	 */
 	/**
 	 * Is IMagick supported? Is the current image(sub)format supported?
 	 *
@@ -154,40 +170,21 @@ class ImageSizerEngineIMagick extends ImageSizerEngine {
 		if(!class_exists("\\IMagick")) return false;
 
 		// and if it passes the mandatory requirements, we check particularly aspects here
-		switch($action) {
-
-			case 'imageformat':
-				// compare current imagefile infos fetched from ImageInspector
-				$requested = $this->getImageInfo(false);
-				switch($requested) {
-					case 'jpg':
-						return true;
-					case 'png24':
-					case 'png24-trans':
-					case 'png24-alpha':
-						return true;
-					default:
-						return false;
-				}
-				break;
-			
-			case 'webp':
-				if(self::$webpSupport === null) {
-					$im = new \IMagick();
-					$formats = $im->queryformats('WEBP*');
-					self::$webpSupport = count($formats) > 0; 
-				}
-				return self::$webpSupport;
-				break;
-			
-			case 'install':
-				return true;
-
-			default:
-				return false;
+		$supported = false;
+		if($action === 'imageformat') {
+			// compare current imagefile infos fetched from ImageInspector
+			$requested = $this->getImageInfo(false);
+			$supported = $this->supportsFormat($requested);
+		} else if($action === 'webp') {
+			$supported = $this->supportsFormat('WEBP');
+		} else if($action === 'install') {
+			$supported = true;
 		}
+		
+		return $supported; 
 	}
 
+
 	/**
 	 * Process the image resize
 	 *
@@ -232,16 +229,16 @@ class ImageSizerEngineIMagick extends ImageSizerEngine {
 		$this->imageFormat = strtoupper($this->im->getImageFormat());
 
 		// only for JPEGs and 24bit PNGs
-		if(!in_array($this->imageFormat, array('JPG', 'JPEG', 'PNG24'))) {
+		if(!in_array($this->imageFormat, $this->validSourceImageFormats())) {
 			$this->release();
 			return false;
 		}
 
-		// check validity against PW
-		if(!in_array($this->imageFormat, $this->validSourceImageFormats())) {
-			$this->release();
-			throw new WireException(sprintf($this->_("loaded file '%s' is not in the list of valid images"), basename($dstFilename)));
-		}
+		// check validity against PW (this does not seem to be reachable due to above code, so commented it out —Ryan)
+		// if(!in_array($this->imageFormat, $this->validSourceImageFormats())) {
+		//	$this->release();
+		//	throw new WireException(sprintf($this->_("loaded file '%s' is not in the list of valid images"), basename($dstFilename)));
+		// }
 
 		// check and retrieve different image parts and information: ICC, Colorspace, Colordepth, Metadata, etc
 		$this->imageColorspace = $this->im->getImageColorspace();
@@ -385,46 +382,53 @@ class ImageSizerEngineIMagick extends ImageSizerEngine {
 		}
 
 		$this->im->setImageDepth(($this->imageDepth > 8 ? 8 : $this->imageDepth));
+	
+		// determine whether webp should be created as well (or on its own)
+		$webpOnly = $this->webpOnly && $this->supported('webp');
+		$webpAdd = $webpOnly || ($this->webpAdd && $this->supported('webp'));
 		
-		// prepare to save file(s)
-		if($this->webpAdd && $this->supported('webp')) {
-			$this->imWebp = clone $this->im; // make a copy before compressions take effect
-		}
-
-		$this->im->setImageFormat($this->imageFormat);
-		$this->im->setImageType($this->imageType);
-		if(in_array(strtoupper($this->imageFormat), array('JPG', 'JPEG'))) {
-			$this->im->setImageCompression(\Imagick::COMPRESSION_JPEG);
-			$this->im->setImageCompressionQuality($this->quality);
-		} else if(in_array(strtoupper($this->imageFormat), array('PNG', 'PNG8', 'PNG24'))) {
-			$this->im->setImageCompression(\Imagick::COMPRESSION_ZIP);
-			$this->im->setImageCompressionQuality($this->quality);
+		if($webpOnly) {
+			// only a webp file will be created
+			$this->imWebp = $this->im;
 		} else {
-			$this->im->setImageCompression(\Imagick::COMPRESSION_UNDEFINED);
-			$this->im->setImageCompressionQuality($this->quality);
-		}
+			if($webpAdd) $this->imWebp = clone $this->im; // make a copy before compressions take effect
+			$this->im->setImageFormat($this->imageFormat);
+			$this->im->setImageType($this->imageType);
+			if(in_array(strtoupper($this->imageFormat), array('JPG', 'JPEG'))) {
+				$this->im->setImageCompression(\Imagick::COMPRESSION_JPEG);
+				$this->im->setImageCompressionQuality($this->quality);
+			} else if(in_array(strtoupper($this->imageFormat), array('PNG', 'PNG8', 'PNG24'))) {
+				$this->im->setImageCompression(\Imagick::COMPRESSION_ZIP);
+				$this->im->setImageCompressionQuality($this->quality);
+			} else {
+				$this->im->setImageCompression(\Imagick::COMPRESSION_UNDEFINED);
+				$this->im->setImageCompressionQuality($this->quality);
+			}
 
-		// write to file
-		if(file_exists($dstFilename)) $this->wire('files')->unlink($dstFilename);
-		@clearstatcache(dirname($dstFilename));
-		##if(!$this->im->writeImage($this->destFilename)) {
-		// We use this approach for saving so that it behaves the same like core ImageSizer with images that
-		// have a wrong extension in their filename. When using writeImage() it automatically corrects the
-		// mimetype to match the fileextension, <- we want to avoid this!
-		if(!file_put_contents($dstFilename, $this->im)) {
-			$this->release();
-			return false;
+			// write to file
+			if(file_exists($dstFilename)) $this->wire('files')->unlink($dstFilename);
+			@clearstatcache(dirname($dstFilename));
+			##if(!$this->im->writeImage($this->destFilename)) {
+			// We use this approach for saving so that it behaves the same like core ImageSizer with images that
+			// have a wrong extension in their filename. When using writeImage() it automatically corrects the
+			// mimetype to match the fileextension, <- we want to avoid this!
+			if(!file_put_contents($dstFilename, $this->im)) {
+				$this->release();
+				return false;
+			}
 		}
-		
+			
 		// set modified flag and delete optional webp dependency file
 		$this->modified = true;
 		$return = true;
+		
+		// if there is a corresponding webp file present, remove it
 		$pathinfo = pathinfo($srcFilename);
 		$webpFilename = $pathinfo['dirname'] . '/' . $pathinfo['filename'] . '.webp';
 		if(file_exists($webpFilename)) $this->wire('files')->unlink($webpFilename);
-		
+			
 		// optionally create a WebP dependency file
-		if($this->webpAdd && $this->imWebp) {
+		if($webpAdd) {
 			// prepare for webp output
 			$this->imWebp->setImageFormat('webp');
 			$this->imWebp->setImageCompressionQuality($this->webpQuality);
@@ -438,6 +442,7 @@ class ImageSizerEngineIMagick extends ImageSizerEngine {
 
 		// release and return to event-object
 		$this->release();
+		
 		return $return;
 	}