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diff --git a/oox/inc/drawingml/chart/chartdrawingfragment.hxx b/oox/inc/drawingml/chart/chartdrawingfragment.hxx
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+++ b/oox/inc/drawingml/chart/chartdrawingfragment.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_OOX_DRAWINGML_CHART_CHARTDRAWINGFRAGMENT_HXX
+#define INCLUDED_OOX_DRAWINGML_CHART_CHARTDRAWINGFRAGMENT_HXX
+
+#include <oox/core/fragmenthandler2.hxx>
+#include <oox/drawingml/shape.hxx>
+
+namespace oox::drawingml::chart {
+
+
+/** Relative shape position in a chart object. */
+struct AnchorPosModel
+{
+    double              mfX;                /// X coordinate relative to chart object (0.0 to 1.0).
+    double              mfY;                /// Y coordinate relative to chart object (0.0 to 1.0).
+
+                 AnchorPosModel() : mfX( -1.0 ), mfY( -1.0 ) {}
+    bool         isValid() const { return (0.0 <= mfX) && (mfX <= 1.0) && (0.0 <= mfY) && (mfY <= 1.0); }
+};
+
+
+/** Absolute shape size in a chart object (in EMUs). */
+struct AnchorSizeModel : public EmuSize
+{
+                 AnchorSizeModel() : EmuSize( -1, -1 ) {}
+    bool         isValid() const { return (Width >= 0) && (Height >= 0); }
+};
+
+
+/** Contains the position of a shape in the chart object. Supports different
+    shape anchor modes (absolute, relative).
+ */
+class ShapeAnchor
+{
+public:
+    explicit            ShapeAnchor( bool bRelSize );
+
+    /** Imports the absolute anchor size from the cdr:ext element. */
+    void                importExt( const AttributeList& rAttribs );
+    /** Sets the relative anchor position from the cdr:from or cdr:to element. */
+    void                setPos( sal_Int32 nElement, sal_Int32 nParentContext, std::u16string_view rValue );
+
+    /** Calculates the resulting shape anchor in EMUs. */
+    EmuRectangle        calcAnchorRectEmu( const EmuRectangle& rChartRect ) const;
+
+private:
+    AnchorPosModel      maFrom;             /// Top-left position relative to chart object.
+    AnchorPosModel      maTo;               /// Bottom-right position relative to chart object.
+    AnchorSizeModel     maSize;             /// Shape size, if anchor has absolute size.
+    bool                mbRelSize;          /// True = relative size, false = absolute size.
+};
+
+/** Handler for a chart drawing fragment (c:userShapes root element).
+ */
+class ChartDrawingFragment final : public ::oox::core::FragmentHandler2
+{
+public:
+    explicit            ChartDrawingFragment(
+                            ::oox::core::XmlFilterBase& rFilter,
+                            const OUString& rFragmentPath,
+                            const css::uno::Reference< css::drawing::XShapes >& rxDrawPage,
+                            const css::awt::Size& rChartSize,
+                            const css::awt::Point& rShapesOffset,
+                            bool bOleSupport );
+    virtual             ~ChartDrawingFragment() override;
+
+    virtual ::oox::core::ContextHandlerRef onCreateContext( sal_Int32 nElement, const AttributeList& rAttribs ) override;
+    virtual void        onCharacters( const OUString& rChars ) override;
+    virtual void        onEndElement() override;
+
+private:
+    css::uno::Reference< css::drawing::XShapes >
+                        mxDrawPage;             /// Drawing page of this sheet.
+    ::oox::drawingml::ShapePtr mxShape;         /// Current top-level shape.
+    std::shared_ptr< ShapeAnchor > mxAnchor;    /// Current anchor of top-level shape.
+    EmuRectangle        maChartRectEmu;         /// Position and size of the chart object for embedded shapes (in EMUs).
+    bool                mbOleSupport;           /// True = allow to insert OLE objects into the drawing page.
+};
+
+
+} // namespace oox::drawingml::chart
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */