public function renderRowDefinition(PHPRtfLite_Table_Row $row)
    {
        $rowIndex = $row->getRowIndex();
        $stream = $this->getRtf()->getWriter();
        $stream->write('\trowd');

        if ($this->_alignment) {
            switch ($this->_alignment) {
                case self::ALIGN_CENTER:
                    $stream->write('\trqc');
                    break;

                case self::ALIGN_RIGHT:
                    $stream->write('\trqr');
                    break;

                default:
                    $stream->write('\trql');
                    break;
            }
        }

        $rowHeight = $row->getHeight();
        if ($rowHeight) {
            $stream->write('\trrh' . PHPRtfLite_Unit::getUnitInTwips($rowHeight));
        }

        if ($this->isPreventPageBreak()) {
            $stream->write('\trkeep ');
        }

        if ($this->isFirstRowHeader() && $rowIndex == 1) {
            $stream->write('\trhdr ');
        }

        if ($this->getLeftPosition() != '') {
            $stream->write('\trleft' . PHPRtfLite_Unit::getUnitInTwips($this->getLeftPosition()) . ' ');
        }

        $width = 0;
        foreach ($this->getColumns() as $columnIndex => $column) {
            $cell = $this->getCell($rowIndex, $columnIndex + 1);

            // render cell definition
            if (!$cell->isHorizontalMerged()) {
                $cell->renderDefinition();

                // cell width
                $width += PHPRtfLite_Unit::getUnitInTwips($cell->getWidth());
                $stream->write('\cellx' . $width);
            }
        }
    }