Bug 194549 Memory leak in chart device renderers
After memory analysis for Chart code, it indicates java.awt.Font objects are not garbage collected. Investigating the renderer code, Graphics2D objects in IDisplayServer and IDeviceRenderer are not disposed after chart rendering finished. Need to invoke IDeviceRenderer.dispose() after ChartReportItemPresentationImpl being finished, and dispose all required resources in that method, including IDisplayServer and anything else.
chart/org.eclipse.birt.chart.device.extension/src/org/eclipse/birt/chart/device/swing/SwingRendererImpl.java
*/
	protected static final int[][] getCoordinatesAsInts( Location[] la )
	{
		final int n = la.length;
		final int[] iaX = new int[n];
		final int[] iaY = new int[n];
		for ( int i = 0; i < n; i++ )
		{
			iaX[i] = (int) la[i].getX( );
			iaY[i] = (int) la[i].getY( );
		}
		return new int[][]{
				iaX, iaY
		};
	}
	/**
	 * Make bounds height/width always positive.
	 * 
	 * @param bo
	 * @return
	 */
	protected static final Bounds normalizeBounds( Bounds bo )
	{
		if ( bo.getHeight( ) < 0 )
		{
			bo.setTop( bo.getTop( ) + bo.getHeight( ) );
			bo.setHeight( -bo.getHeight( ) );
		}
		if ( bo.getWidth( ) < 0 )
		{