Bug 315050 [Automation][Regression]Image size is different from golden file when preview as xls
engine/org.eclipse.birt.report.engine.emitter.prototype.excel/src/org/eclipse/birt/report/engine/emitter/excel/layout/ExcelLayoutEngine.java
private int autoBookmarkIndex = 0;
	public static final String AUTO_GENERATED_BOOKMARK = "auto_generated_bookmark_";
	public final static int MAX_ROW_OFFICE2007 = 1048576;
	
	public final static int MAX_COL_OFFICE2007 = 16384;
	
	public final static int MAX_ROW_OFFICE2003 = 65535;
	
	public final static int MAX_COLUMN_OFFICE2003 = 255;
	
	private int maxRow = MAX_ROW_OFFICE2003;
	private int maxCol = MAX_COLUMN_OFFICE2003;
	
	private HashMap<String, String> cachedBookmarks = new HashMap<String, String>( );
	protected DataCache cache;
	private AxisProcessor axis;
	protected StyleEngine engine;
	
	private ExcelEmitter emitter;
	private Stack<XlsContainer> containers = new Stack<XlsContainer>( );
	private Stack<XlsTable> tables = new Stack<XlsTable>( );
	private ExcelContext context = null;
	private String messageFlashObjectNotSupported;
	
	private ULocale locale;
	private HashMap<String, BookmarkDef> bookmarkList = new HashMap<String, BookmarkDef>( );
	protected int reportDpi;
	protected Stack<Boolean> rowVisibilities = new Stack<Boolean>( );
	public ExcelLayoutEngine( ExcelContext context,
			ExcelEmitter emitter )