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
{
	private int iLineCount = 0;
	private double cachedWidth;
	private String[] oText = null;
	private GC gc = null;
	private Label la = null;