Bug 212291 SWT Chart render engine always uses 96 DPI(Display) resolution
chart/org.eclipse.birt.chart.device.extension/src/org/eclipse/birt/chart/device/swing/SwingTextMetrics.java
* @param fm
	 * @return
	 */
	public final double getHeight( )
	{
		return fm.getHeight( );
	}
	/**
	 * 
	 * @param fm
	 * @return
	 */
	public final double getDescent( )
	{
		return fm.getDescent( );
	}
	/**
	 * 
	 * @param fm
	 * @return The width of the line containing the maximum width (if multiline
	 *         split by hard breaks) or the width of the single line of text
	 */
	private final double stringWidth( )
	{
		if ( !Double.isNaN( cachedwidth ) )
		{
			return cachedwidth;
		}
		cachedwidth = 0;
		Rectangle2D r2d;