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diff --git a/drawinglayer/inc/primitive2d/cropprimitive2d.hxx b/drawinglayer/inc/primitive2d/cropprimitive2d.hxx
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+++ b/drawinglayer/inc/primitive2d/cropprimitive2d.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/primitive2d/groupprimitive2d.hxx>
+#include <basegfx/matrix/b2dhommatrix.hxx>
+
+
+namespace drawinglayer::primitive2d
+    {
+        /** CropPrimitive2D class
+
+            Caution: Due to old constraints (old core definitions) the
+            crop distances describe how the uncropped content is defined
+            relative to the current object size. This means that maTransformation
+            describes the current object size (the part of the object visible
+            with the crop applied). To get the original size and orientation
+            of the uncropped content it is necessary to calc back from the
+            current situation (maTransformation) using the crop values
+            to get to the uncropped original content.
+
+            Thus a transformation has to be calculated which will be applied
+            to the already existing content to get it to the uncropped state
+            and then this is masked with the current state (mask polygon
+            created from unit polygon and maTransformation).
+
+            At least in this primitive the units of the crop values are
+            already in the local coordinate system; in the core these distances
+            are defined relative to the object content size (PrefMapMode
+            and PrefSize of the content)...
+
+            Of course this is a primitive, so feel free to just ignore all that
+            stuff and use the automatically generated decomposition. Sigh.
+        */
+        class CropPrimitive2D final : public GroupPrimitive2D
+        {
+        private:
+            // the transformation already applied to the child geometry
+            basegfx::B2DHomMatrix           maTransformation;
+
+            // the crop offsets relative to the range of the unrotated content
+            double                          mfCropLeft;
+            double                          mfCropTop;
+            double                          mfCropRight;
+            double                          mfCropBottom;
+
+        public:
+            /// constructor
+            CropPrimitive2D(
+                Primitive2DContainer&& aChildren,
+                const basegfx::B2DHomMatrix& rTransformation,
+                double fCropLeft,
+                double fCropTop,
+                double fCropRight,
+                double fCropBottom);
+
+            /// data read access
+            const basegfx::B2DHomMatrix& getTransformation() const { return maTransformation; }
+            double getCropLeft() const { return mfCropLeft; }
+            double getCropTop() const { return mfCropTop; }
+            double getCropRight() const { return mfCropRight; }
+            double getCropBottom() const { return mfCropBottom; }
+
+            /// compare operator
+            virtual bool operator==(const BasePrimitive2D& rPrimitive) const override;
+
+            /// local decomposition
+            virtual void get2DDecomposition(Primitive2DDecompositionVisitor& rVisitor, const geometry::ViewInformation2D& rViewInformation) const override;
+
+            /// provide unique ID
+            virtual sal_uInt32 getPrimitive2DID() const override;
+        };
+
+} // end of namespace drawinglayer::primitive2d
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */