core-bundle/src/Resources/contao/library/Contao/Image.php
public function getImportantPart()
	{
		if ($this->importantPart)
		{
			return $this->importantPart;
		}

		return array('x'=>0, 'y'=>0, 'width'=>$this->fileObj->viewWidth, 'height'=>$this->fileObj->viewHeight);
	}
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 important part settings

@return array The settings array