Contao\Image::getImportantPart PHP Method

    public function getImportantPart()
    {
        if ($this->importantPart) {
            return $this->importantPart;
        }
        return array('x' => 0, 'y' => 0, 'width' => $this->fileObj->viewWidth, 'height' => $this->fileObj->viewHeight);
    }

 /**
  * Get the picture element definition array
  *
  * @return array The picture element definition
  */
 public function getTemplateData()
 {
     $image = \System::getContainer()->get('contao.image.image_factory')->create(TL_ROOT . '/' . $this->image->getOriginalPath());
     $config = new PictureConfiguration();
     $config->setSize($this->getConfigurationItem($this->imageSize));
     $sizeItems = array();
     foreach ($this->imageSizeItems as $imageSizeItem) {
         $sizeItems[] = $this->getConfigurationItem($imageSizeItem);
     }
     $config->setSizeItems($sizeItems);
     $importantPart = $this->image->getImportantPart();
     $image->setImportantPart(new ImportantPart(new Point($importantPart['x'], $importantPart['y']), new Box($importantPart['width'], $importantPart['height'])));
     $container = \System::getContainer();
     $picture = $container->get('contao.image.picture_generator')->generate($image, $config, (new ResizeOptions())->setImagineOptions($container->getParameter('contao.image.imagine_options'))->setBypassCache($container->getParameter('contao.image.bypass_cache')));
     return array('img' => $picture->getImg(TL_ROOT), 'sources' => $picture->getSources(TL_ROOT));
 }