class AvifImageEffect

class AvifImageEffect extends ConvertImageEffect {
  
  /**
   * The image toolkit manager.
   *
   * @var \Drupal\Core\ImageToolkit\ImageToolkitManager
   */
  protected ImageToolkitManager $imageToolkitManager;
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) : static {
    $instance = parent::create($container, $configuration, $plugin_id, $plugin_definition);
    $instance->imageToolkitManager = $container->get(ImageToolkitManager::class);
    return $instance;
  }
  
  /**
   * {@inheritdoc}
   */
  public function applyEffect(ImageInterface $image) {
    // If avif is not supported fallback to the parent.
    if (!$this->isAvifSupported()) {
      return parent::applyEffect($image);
    }
    if (!$image->convert('avif')) {
      $this->logger
        ->error('Image convert failed using the %toolkit toolkit on %path (%mimetype)', [
        '%toolkit' => $image->getToolkitId(),
        '%path' => $image->getSource(),
        '%mimetype' => $image->getMimeType(),
      ]);
      return FALSE;
    }
    return TRUE;
  }
  
  /**
   * {@inheritdoc}
   */
  public function getDerivativeExtension($extension) {
    return $this->isAvifSupported() ? 'avif' : $this->configuration['extension'];
  }
  
  /**
   * {@inheritdoc}
   */
  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
    $form = parent::buildConfigurationForm($form, $form_state);
    unset($form['extension']['#options']['avif']);
    $form['extension']['#title'] = $this->t('Fallback format');
    $form['extension']['#description'] = $this->t('Format to use if AVIF is not available.');
    return $form;
  }
  
  /**
   * Is AVIF supported by the image toolkit.
   */
  protected function isAvifSupported() : bool {
    return in_array('avif', $this->imageToolkitManager
      ->getDefaultToolkit()
      ->getSupportedExtensions());
  }

}