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diff --git a/include/drawinglayer/primitive2d/transparenceprimitive2d.hxx b/include/drawinglayer/primitive2d/transparenceprimitive2d.hxx
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+++ b/include/drawinglayer/primitive2d/transparenceprimitive2d.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/primitive2d/groupprimitive2d.hxx>
+
+
+namespace drawinglayer::primitive2d
+{
+        /** TransparencePrimitive2D class
+
+            This is the basic primitive for applying freely defined transparence
+            to freely defined content. The basic idea is to associate a content
+            which is defined as a sequence of primitives and hold as child content
+            in the GroupPrimitive2D with a transparence channel also defined as a sequence
+            of primitives and hold in the transparence member.
+
+            The basic definition is to use the transparence content as transparence-Mask by
+            interpreting the transparence-content not as RGB, but as Luminance transparence mask
+            using the common RGB_to_luminance definition as e.g. used by VCL.
+
+            The defining geometry is the Range of the child primitive sequence,
+            this means the renderers will/shall use this geometric information for
+            rendering, not the transparent one. The transparent one should/will be clipped
+            accordingly.
+         */
+        class DRAWINGLAYER_DLLPUBLIC TransparencePrimitive2D final : public GroupPrimitive2D
+        {
+        private:
+            /// The transparence-Mask who's RGB-Values are interpreted as Luminance
+            Primitive2DContainer                     maTransparence;
+
+        public:
+            /** constructor
+
+                @param rChildren
+                The content which is defined to have a transparency. The
+                range of this primitive is defined by this content
+
+                @param rTransparence
+                The definition of the Transparence-channel for this primitive. It
+                will be interpreted as mask by interpreting as gray values
+                using the common RGB_to_luminance definitions
+             */
+            TransparencePrimitive2D(
+                const Primitive2DContainer& rChildren,
+                const Primitive2DContainer& rTransparence);
+
+            /// data read access
+            const Primitive2DContainer& getTransparence() const { return maTransparence; }
+
+            /// compare operator
+            virtual bool operator==(const BasePrimitive2D& rPrimitive) const override;
+
+            /// provide unique ID
+            virtual sal_uInt32 getPrimitive2DID() const override;
+        };
+} // end of namespace drawinglayer::primitive2d
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */