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/SwtTextMetrics.java
final int iDescent = gc.getFontMetrics( ).getDescent( );
		return iDescent;
	}
	/**
	 * 
	 * @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;
		gc.setFont( getFont( ) );
		double dWidth;
		if ( iLineCount > 1 )
		{
			String[] sa = oText;
			for ( int i = 0; i < iLineCount; i++ )
			{
				dWidth = gc.textExtent( sa[i] ).x;
				if ( dWidth > cachedWidth )
				{
					cachedWidth = dWidth;
				}
			}
		}
		else