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diff --git a/drawinglayer/inc/processor3d/shadow3dextractor.hxx b/drawinglayer/inc/processor3d/shadow3dextractor.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 .
+ */
+
+#pragma once
+
+#include <drawinglayer/drawinglayerdllapi.h>
+
+#include <drawinglayer/processor3d/baseprocessor3d.hxx>
+#include <drawinglayer/primitive2d/baseprimitive2d.hxx>
+#include <basegfx/matrix/b3dhommatrix.hxx>
+#include <basegfx/polygon/b2dpolygon.hxx>
+#include <basegfx/polygon/b2dpolypolygon.hxx>
+#include <basegfx/matrix/b2dhommatrix.hxx>
+
+namespace basegfx { class B3DPolyPolygon; }
+namespace basegfx { class B3DPolygon; }
+
+
+namespace drawinglayer
+{
+    namespace processor3d
+    {
+        /** Shadow3DExtractingProcessor class
+
+            This processor extracts the 2D shadow geometry (projected geometry) of all fed primitives.
+            It is used to create the shadow of 3D objects which consists of 2D geometry. It needs quite
+            some data to do so since we do not only offer flat projected 2D shadow, but also projections
+            dependent on the light source
+         */
+        class Shadow3DExtractingProcessor final : public BaseProcessor3D
+        {
+        private:
+            /// result holding vector (2D) and target vector for stacking (inited to &maPrimitive2DSequence)
+            primitive2d::Primitive2DContainer                  maPrimitive2DSequence;
+            primitive2d::Primitive2DContainer*                 mpPrimitive2DSequence;
+
+            /// object transformation for scene for 2d definition
+            basegfx::B2DHomMatrix                           maObjectTransformation;
+
+            /// prepared data (transformations) for 2D/3D shadow calculations
+            basegfx::B3DHomMatrix                           maWorldToEye;
+            basegfx::B3DHomMatrix                           maEyeToView;
+            basegfx::B3DVector                              maLightNormal;
+            basegfx::B3DVector                              maShadowPlaneNormal;
+            basegfx::B3DPoint                               maPlanePoint;
+            double                                          mfLightPlaneScalar;
+
+            /// flag if shadow plane projection preparation led to valid results
+            bool                                            mbShadowProjectionIsValid : 1;
+
+            /// flag if conversion is switched on
+            bool                                            mbConvert : 1;
+
+            /// flag if conversion shall use projection
+            bool                                            mbUseProjection : 1;
+
+            /// local helpers
+            basegfx::B2DPolygon impDoShadowProjection(const basegfx::B3DPolygon& rSource);
+            basegfx::B2DPolyPolygon impDoShadowProjection(const basegfx::B3DPolyPolygon& rSource);
+
+            /*  as tooling, the process() implementation takes over API handling and calls this
+                virtual render method when the primitive implementation is BasePrimitive3D-based.
+             */
+            virtual void processBasePrimitive3D(const primitive3d::BasePrimitive3D& rCandidate) override;
+
+        public:
+            Shadow3DExtractingProcessor(
+                const geometry::ViewInformation3D& rViewInformation,
+                const basegfx::B2DHomMatrix& rObjectTransformation,
+                const basegfx::B3DVector& rLightNormal,
+                double fShadowSlant,
+                const basegfx::B3DRange& rContained3DRange);
+            virtual ~Shadow3DExtractingProcessor() override;
+
+            /// data read access
+            const primitive2d::Primitive2DContainer& getPrimitive2DSequence() const;
+            const basegfx::B2DHomMatrix& getObjectTransformation() const { return maObjectTransformation; }
+            const basegfx::B3DHomMatrix& getWorldToEye() const { return maWorldToEye; }
+        };
+    } // end of namespace processor3d
+} // end of namespace drawinglayer
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */