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
* string contains full pitch characters.
			 */
			double w = fm.getStringBounds( fsa[0], g2d ).getWidth( );
			/**
			 * Fixed for java.awt.font.TextLine.getBounds() bug, when string is
			 * blank, e.g. " ", it will return an negative result.
			 */
			cachedwidth = Math.max( 0, w );
		}
		return cachedwidth;
	}
	final double pointsToPixels( )
	{
		return ( xs.getDpiResolution( ) / 72d );
	}
	public final double getFullHeight( )
	{
		return getHeight( )
				* getLineCount( )
				+ ( ins.getTop( ) + ins.getBottom( ) );
	}
	public final double getFullWidth( )
	{
		return stringWidth( ) + ( ins.getLeft( ) + ins.getRight( ) );
	}
	/**
	 * 
	 * @return The number of lines created due to the hard breaks inserted
	 */
	public final int getLineCount( )