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
{
		Iterator<SheetData[]> rowIterator;
		public ExcelLayoutEngineIterator( )
		{
			rowIterator = cache.getRowIterator( );
		}
		public boolean hasNext( )
		{
			return rowIterator.hasNext( );
		}
		public RowData next( )
		{
			SheetData[] row = rowIterator.next( );
			List<SheetData> data = new ArrayList<SheetData>( );
			int width = Math.min( row.length, maxCol - 1 );
			int rowIndex = 0;
			for ( int i = 0; i < width; i++ )
			{
				SheetData d = row[i];
				if ( d == null || d.isBlank( ) )
				{
					continue;
				}
				rowIndex = d.getRowIndex( );
				data.add( row[i] );
			}
			SheetData[] rowdata = new SheetData[data.size( )];
			double rowHeight = Math.max( DEFAULT_ROW_HEIGHT, cache