Issue #3189190 - Support Imagick and ImageMagick toolkits

Closes #3189190

src/Plugin/ImageAPIOptimizeProcessor/WebP.php

@@ -18,14 +18,25 @@ class WebP extends ConfigurableImageAPIOptimizeProcessorBase {
    * {@inheritdoc}
    */
   public function applyToImage($image_uri) {
-    $source_image = $this->imageFactory->get($image_uri, 'gd');
+    $toolkit_id = $this->imageFactory->getToolkitId();
+    $source_image = $this->imageFactory->get($image_uri, $toolkit_id);
+
     if ($source_image) {
       $destination = $image_uri . '.webp';
-      // @todo: Add try/catch.
-      imagewebp($source_image->getToolkit()->getResource(), $destination, $this->configuration['quality']);
-      // Fix issue where sometimes image fails to generate.
-      if (filesize($destination) % 2 == 1) {
-        file_put_contents($destination, "\0", FILE_APPEND);
+
+      if (in_array('webp', $this->imageFactory->getSupportedExtensions())) {
+        $source_image->apply('convert', [
+          'format' => 'webp',
+          'quality' => $this->configuration['quality'],
+        ]);
+        $source_image->save($destination);
+      } else {
+        imagewebp($source_image->getToolkit()
+          ->getResource(), $destination, $this->configuration['quality']);
+        // Fix issue where sometimes image fails to generate.
+        if (filesize($destination) % 2 == 1) {
+          file_put_contents($destination, "\0", FILE_APPEND);
+        }
       }
       return TRUE;
     }