Desaturate.php

<?php

namespace Drupal\system\Plugin\ImageToolkit\Operation\gd;

use Drupal\Core\ImageToolkit\Attribute\ImageToolkitOperation;
use Drupal\Core\StringTranslation\TranslatableMarkup;

/**
 * Defines GD2 Desaturate operation.
 */
class Desaturate extends GDImageToolkitOperationBase {
    
    /**
     * {@inheritdoc}
     */
    protected function arguments() {
        // This operation does not use any parameters.
        return [];
    }
    
    /**
     * {@inheritdoc}
     */
    protected function execute(array $arguments) {
        // PHP installations using non-bundled GD do not have imagefilter.
        if (!function_exists('imagefilter')) {
            $this->logger
                ->notice("The image '@file' could not be desaturated because the imagefilter() function is not available in this PHP installation.", [
                '@file' => $this->getToolkit()
                    ->getSource(),
            ]);
            return FALSE;
        }
        return imagefilter($this->getToolkit()
            ->getImage(), IMG_FILTER_GRAYSCALE);
    }

}