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());
    }

}