owncloud / core

	 * @param null $previewHeight

	 */

	private function cropAndFill($image, $askedWidth, $askedHeight, $previewWidth, $previewHeight) {

		if ($previewWidth > $askedWidth) {

			$cropX = floor(($previewWidth - $askedWidth) * 0.5);

			$image->crop($cropX, 0, $askedWidth, $previewHeight);

			$previewWidth = $askedWidth;

		}

		if ($previewHeight > $askedHeight) {

			$cropY = floor(($previewHeight - $askedHeight) * 0.5);

			$previewWidth = $askedWidth;

		}

		if ($previewHeight > $askedHeight) {

			$cropY = floor(($previewHeight - $askedHeight) * 0.5);

			$image->crop(0, $cropY, $previewWidth, $askedHeight);

			$previewHeight = $askedHeight;

		}

		// Creates a transparent background

		$backgroundLayer = imagecreatetruecolor($askedWidth, $askedHeight);