Bug 193886 NPE is thrown when preview external CSS style in ppt[1205]
engine/org.eclipse.birt.report.engine.emitter.ppt/src/org/eclipse/birt/report/engine/emitter/ppt/PPTRender.java
{
	protected static Logger logger = Logger.getLogger( PPTRender.class.getName( ) );
	
	public static final String REPORT_FILE = "Report.ppt"; 
	
	public static final float LAYOUT_TO_PPT_RATIO = 1000f;
	
	public static final int H_TEXT_SPACE = 70;
	
	public static final int V_TEXT_SPACE = 100;
	
	private OutputStream pptOutput = null;
	
	protected IReportContent report;
	protected int currentPageNum = 0;
	protected double pageWidth = 0.0d;
	protected double pageHeight = 0.0d;
	private int shapeCount = 0;
	
	protected IReportRunnable reportRunnable;
	/**
	 * The overall report design, defines a set of properties that describe the
	 * design as a whole like author, base and comments etc.
	 */
	protected ReportDesignHandle reportDesign;
	/**
	 * The report context,includes report parameters and configuration values.