class Image

class Image implements ImageInterface {
    
    /**
     * Path of the image file.
     *
     * @var string
     */
    protected $source = '';
    
    /**
     * An image toolkit object.
     *
     * @var \Drupal\Core\ImageToolkit\ImageToolkitInterface
     */
    protected $toolkit;
    
    /**
     * File size in bytes.
     *
     * @var int
     */
    protected $fileSize;
    
    /**
     * Constructs a new Image object.
     *
     * @param \Drupal\Core\ImageToolkit\ImageToolkitInterface $toolkit
     *   The image toolkit.
     * @param string|null $source
     *   (optional) The path to an image file, or NULL to construct the object
     *   with no image source.
     */
    public function __construct(ImageToolkitInterface $toolkit, $source = NULL) {
        $this->toolkit = $toolkit;
        if ($source) {
            $this->source = $source;
            $this->getToolkit()
                ->setSource($this->source);
            // Defer image file validity check to the toolkit.
            if ($this->getToolkit()
                ->parseFile()) {
                $this->fileSize = filesize($this->source);
            }
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function isValid() {
        return $this->getToolkit()
            ->isValid();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getHeight() {
        return $this->getToolkit()
            ->getHeight();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getWidth() {
        return $this->getToolkit()
            ->getWidth();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFileSize() {
        return $this->fileSize;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getMimeType() {
        return $this->getToolkit()
            ->getMimeType();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getSource() {
        return $this->source;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getToolkitId() {
        return $this->getToolkit()
            ->getPluginId();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getToolkit() {
        return $this->toolkit;
    }
    
    /**
     * {@inheritdoc}
     */
    public function save($destination = NULL) {
        // Return immediately if the image is not valid.
        if (!$this->isValid()) {
            return FALSE;
        }
        $destination = $destination ?: $this->getSource();
        if ($return = $this->getToolkit()
            ->save($destination)) {
            // Clear the cached file size and refresh the image information.
            clearstatcache(TRUE, $destination);
            $this->fileSize = filesize($destination);
            $this->source = $destination;
            if (\Drupal::service('file_system')->chmod($destination)) {
                return $return;
            }
        }
        return FALSE;
    }
    
    /**
     * {@inheritdoc}
     */
    public function apply($operation, array $arguments = []) {
        return $this->getToolkit()
            ->apply($operation, $arguments);
    }
    
    /**
     * {@inheritdoc}
     */
    public function createNew($width, $height, $extension = 'png', $transparent_color = '#ffffff') {
        return $this->apply('create_new', [
            'width' => $width,
            'height' => $height,
            'extension' => $extension,
            'transparent_color' => $transparent_color,
        ]);
    }
    
    /**
     * {@inheritdoc}
     */
    public function convert($extension) {
        return $this->apply('convert', [
            'extension' => $extension,
        ]);
    }
    
    /**
     * {@inheritdoc}
     */
    public function crop($x, $y, $width, $height = NULL) {
        return $this->apply('crop', [
            'x' => $x,
            'y' => $y,
            'width' => $width,
            'height' => $height,
        ]);
    }
    
    /**
     * {@inheritdoc}
     */
    public function desaturate() {
        return $this->apply('desaturate', []);
    }
    
    /**
     * {@inheritdoc}
     */
    public function resize($width, $height) {
        return $this->apply('resize', [
            'width' => $width,
            'height' => $height,
        ]);
    }
    
    /**
     * {@inheritdoc}
     */
    public function rotate($degrees, $background = NULL) {
        return $this->apply('rotate', [
            'degrees' => $degrees,
            'background' => $background,
        ]);
    }
    
    /**
     * {@inheritdoc}
     */
    public function scaleAndCrop($width, $height) {
        return $this->apply('scale_and_crop', [
            'width' => $width,
            'height' => $height,
        ]);
    }
    
    /**
     * {@inheritdoc}
     */
    public function scale($width, $height = NULL, $upscale = FALSE) {
        return $this->apply('scale', [
            'width' => $width,
            'height' => $height,
            'upscale' => $upscale,
        ]);
    }

}