Bug 212291 SWT Chart render engine always uses 96 DPI(Display) resolution
chart/org.eclipse.birt.chart.device.swt/src/org/eclipse/birt/chart/device/swt/SwtDisplayServer.java
* (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.devices.IDisplayServer#getObserver()
	 */
	public Object getObserver( )
	{
		return null;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.device.IDisplayServer#getTextMetrics(org.eclipse.birt.chart.model.component.Label)
	 */
	public ITextMetrics getTextMetrics( Label la )
	{
		return new SwtTextMetrics( this, la );
	}
	final Device getDevice( )
	{
		return _d;
	}
	final double pointsToPixels( double dPoints )
	{
		return dPoints * getDpiResolution( ) / 72d;
	}
	final void setScale( double dScale )
	{
		this.dScale = dScale;
	}
}