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diff --git a/svx/source/table/tablelayouter.hxx b/svx/source/table/tablelayouter.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_SVX_SOURCE_TABLE_TABLELAYOUTER_HXX
+#define INCLUDED_SVX_SOURCE_TABLE_TABLELAYOUTER_HXX
+
+#include <sal/types.h>
+#include <basegfx/range/b2irectangle.hxx>
+#include <basegfx/tuple/b2ituple.hxx>
+#include <o3tl/safeint.hxx>
+#include <vector>
+
+#include <svx/svdotable.hxx>
+#include <celltypes.hxx>
+
+namespace tools { class Rectangle; }
+
+
+namespace editeng {
+    class SvxBorderLine;
+}
+
+namespace sdr::table {
+
+/** returns true if the cell(nMergedCol,nMergedRow) is merged with other cells.
+    the returned cell( rOriginCol, rOriginRow ) is the origin( top left cell ) of the merge.
+*/
+bool findMergeOrigin( const TableModelRef& xTable, sal_Int32 nMergedCol, sal_Int32 nMergedRow, sal_Int32& rOriginCol, sal_Int32& rOriginRow );
+
+typedef std::vector< editeng::SvxBorderLine* > BorderLineVector;
+typedef std::vector< BorderLineVector > BorderLineMap;
+
+
+// TableModel
+
+struct EdgeInfo final
+{
+    sal_Int32 nIndex;
+    sal_Int32 nPosition;
+    sal_Int32 nMin;
+    sal_Int32 nMax;
+
+    EdgeInfo(sal_Int32 nInIndex, sal_Int32 nInPosition, sal_Int32 nInMin, sal_Int32 nInMax)
+        : nIndex(nInIndex)
+        , nPosition(nInPosition)
+        , nMin(nInMin)
+        , nMax(nInMax)
+    {}
+};
+
+class TableLayouter final
+{
+public:
+    explicit TableLayouter( TableModelRef xTableModel );
+    ~TableLayouter();
+
+    /** try to fit the table into the given rectangle.
+        If the rectangle is too small, it will be grown to fit the table.
+
+        if bFitWidth or bFitHeight is set, the layouter tries to scale
+        the rows and/or columns to the given area. The result my be bigger
+        to fulfill constrains.
+
+        if bFitWidth or bFitHeight is set, the model is changed.
+    */
+    void LayoutTable( ::tools::Rectangle& rRectangle, bool bFitWidth, bool bFitHeight );
+
+    void UpdateBorderLayout();
+
+    bool getCellArea( const CellRef& xCell, const CellPos& rPos, basegfx::B2IRectangle& rArea ) const;
+
+    ::sal_Int32 getRowCount() const { return static_cast< ::sal_Int32 >( maRows.size() ); }
+    ::sal_Int32 getColumnCount() const { return static_cast< ::sal_Int32 >( maColumns.size() ); }
+    sal_Int32 getRowHeight( sal_Int32 nRow ) const;
+
+    sal_Int32 getColumnWidth( sal_Int32 nColumn ) const;
+    sal_Int32 calcPreferredColumnWidth( sal_Int32 nColumn, Size aSize ) const;
+
+    sal_Int32 getMinimumColumnWidth( sal_Int32 nColumn );
+
+    /** checks if the given edge is visible.
+        Edges between merged cells are not visible.
+    */
+    bool isEdgeVisible( sal_Int32 nEdgeX, sal_Int32 nEdgeY, bool bHorizontal ) const;
+
+    /** returns the requested borderline in rpBorderLine or a null pointer if there is no border at this edge */
+    editeng::SvxBorderLine* getBorderLine( sal_Int32 nEdgeX, sal_Int32 nEdgeY, bool bHorizontal )const;
+
+    void updateCells( ::tools::Rectangle const & rRectangle );
+
+    std::vector<EdgeInfo> getHorizontalEdges();
+    sal_Int32 getHorizontalEdge( int nEdgeY, sal_Int32* pnMin, sal_Int32* pnMax );
+
+    std::vector<EdgeInfo> getVerticalEdges();
+    sal_Int32 getVerticalEdge( int nEdgeX , sal_Int32* pnMin, sal_Int32* pnMax);
+
+
+    void DistributeColumns( ::tools::Rectangle& rArea,
+                            sal_Int32 nFirstCol,
+                            sal_Int32 nLastCol,
+                            const bool bOptimize,
+                            const bool bMinimize );
+    void DistributeRows( ::tools::Rectangle& rArea,
+                         sal_Int32 nFirstRow,
+                         sal_Int32 nLastRow,
+                         const bool bOptimize,
+                         const bool bMinimize );
+    void dumpAsXml(xmlTextWriterPtr pWriter) const;
+
+    void LayoutTableWidth(::tools::Rectangle& rArea, bool bFit);
+    void LayoutTableHeight(::tools::Rectangle& rArea, bool bFit);
+
+private:
+    CellRef getCell( const CellPos& rPos ) const;
+    basegfx::B2ITuple getCellSize( const CellRef& xCell, const CellPos& rPos ) const;
+
+    bool isValidColumn( sal_Int32 nColumn ) const { return (nColumn >= 0) && (o3tl::make_unsigned(nColumn) < maColumns.size()); }
+    bool isValidRow( sal_Int32 nRow ) const { return (nRow >= 0) && (o3tl::make_unsigned(nRow) < maRows.size()); }
+    bool isValid( const CellPos& rPos ) const { return isValidColumn( rPos.mnCol ) && isValidRow( rPos.mnRow ); }
+
+    void ClearBorderLayout();
+    static void ClearBorderLayout(BorderLineMap& rMap);
+    void ResizeBorderLayout();
+    void ResizeBorderLayout( BorderLineMap& rMap );
+
+    void SetBorder( sal_Int32 nCol, sal_Int32 nRow, bool bHorizontal, const editeng::SvxBorderLine* pLine );
+
+    static bool HasPriority( const editeng::SvxBorderLine* pThis, const editeng::SvxBorderLine* pOther );
+
+    struct Layout
+    {
+        sal_Int32 mnPos;
+        sal_Int32 mnSize;
+        sal_Int32 mnMinSize;
+
+        Layout() : mnPos( 0 ), mnSize( 0 ), mnMinSize( 0 ) {}
+        void clear() { mnPos = 0; mnSize = 0; mnMinSize = 0; }
+        void dumpAsXml(xmlTextWriterPtr pWriter) const;
+    };
+    typedef std::vector< Layout > LayoutVector;
+
+    static sal_Int32 distribute( LayoutVector& rLayouts, sal_Int32 nDistribute );
+
+    TableModelRef mxTable;
+    LayoutVector maRows;
+    LayoutVector maColumns;
+
+    BorderLineMap maHorizontalBorders;
+    BorderLineMap maVerticalBorders;
+};
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */