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diff --git a/drawinglayer/inc/processor3d/geometry2dextractor.hxx b/drawinglayer/inc/processor3d/geometry2dextractor.hxx
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+++ b/drawinglayer/inc/processor3d/geometry2dextractor.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/processor3d/baseprocessor3d.hxx>
+#include <drawinglayer/primitive2d/Primitive2DContainer.hxx>
+#include <basegfx/matrix/b2dhommatrix.hxx>
+#include <basegfx/color/bcolormodifier.hxx>
+
+
+namespace drawinglayer::processor3d
+    {
+        /** Geometry2DExtractingProcessor class
+
+            This processor extracts the 2D geometry (projected geometry) of all fed primitives.
+            It is e.g. used as sub-processor for contour extraction where 3D geometry is only
+            useful as 2D projected geometry.
+         */
+        class Geometry2DExtractingProcessor final : public BaseProcessor3D
+        {
+        private:
+            /// result holding vector (2D)
+            primitive2d::Primitive2DContainer                  maPrimitive2DSequence;
+
+            /// object transformation for scene for 2d definition
+            basegfx::B2DHomMatrix                           maObjectTransformation;
+
+            /// the modifiedColorPrimitive stack
+            basegfx::BColorModifierStack                    maBColorModifierStack;
+
+            /*  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:
+            Geometry2DExtractingProcessor(
+                const geometry::ViewInformation3D& rViewInformation,
+                const basegfx::B2DHomMatrix& rObjectTransformation);
+
+            // data read access
+            const primitive2d::Primitive2DContainer& getPrimitive2DSequence() const { return maPrimitive2DSequence; }
+            const basegfx::B2DHomMatrix& getObjectTransformation() const { return maObjectTransformation; }
+        };
+
+} // end of namespace drawinglayer::processor3d
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */