Bug 212291 SWT Chart render engine always uses 96 DPI(Display) resolution
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/device/IDisplayServer.java
* @param la
	 *            The Label instance for which text metrics are being requested
	 * 
	 * @return Text metrics associated with the specified Label instance
	 */
	ITextMetrics getTextMetrics( Label la );
	/**
	 * Provides the locale to display server implementations as needed to
	 * retrieve localized resources for presentation.
	 * 
	 * @return locale
	 * @deprecated use {@link #getULocale()} instead.
	 */
	Locale getLocale( );
	/**
	 * Provides the locale to display server implementations as needed to
	 * retrieve localized resources for presentation.
	 * 
	 * @return ulocale
	 * @since 2.1
	 */
	ULocale getULocale( );
	
	/**
	 * A notification sent to the device to free all allocated system resources.
	 * 
	 * @since 2.2
	 */
	void dispose( );
}