Bug 196272 Text position is incorrect in postscript and ppt.
Text position need to be ajusted according to baseline position.
engine/org.eclipse.birt.report.engine.emitter.pdf/src/org/eclipse/birt/report/engine/emitter/pdf/PDFPage.java
cbUnder.newPath( );
	}
	public void clipRestore( )
	{
		cbUnder.restoreState( );
		contentByte.restoreState( );
	}
	public void clipSave( )
	{
		cbUnder.saveState( );
		contentByte.saveState( );
	}
	public void dispose( )
	{
	}
	public void drawBackgroundColor( Color color, int x, int y, int width,
			int height )
	{
		drawBackgroundColor( color, convertToPoint( x ), convertToPoint( y ),
				convertToPoint( width ), convertToPoint( height ) );
	}
	private void drawBackgroundColor( Color color, float x, float y,
			float width, float height )
	{
		if ( null == color )
		{
			return;
		}
		y = transformY( y, height );
		cbUnder.saveState( );