concrete/src/File/Image/BasicThumbnailer.php
private function returnThumbnailObjectFromResolver($obj, $maxWidth, $maxHeight, $crop = false)
    {
        return $this->processThumbnail(true, $obj, $maxWidth, $maxHeight, $crop);
    }
private function returnThumbnailObjectFromResolver($obj, $maxWidth, $maxHeight, $crop = false)
    {
        return $this->processThumbnail(true, $obj, $maxWidth, $maxHeight, $crop);
    }
private function returnThumbnailObjectFromResolver ( $ obj , $ maxWidth , $ maxHeight , $ crop = false ) { return $ this -> processThumbnail ( true , $ obj , $ maxWidth , $ maxHeight , $ crop ) ; }
Checks thumbnail resolver for filename, schedule for creation via ajax if necessary.

@param File|string $obj file instance of path to a file
@param int|null $maxWidth
@param int|null $maxHeight
@param bool $crop

@return \stdClass
Checks thumbnail resolver for filename schedule for creation via ajax if necessary .