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diff --git a/include/vcl/alpha.hxx b/include/vcl/alpha.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_VCL_ALPHA_HXX
+#define INCLUDED_VCL_ALPHA_HXX
+
+#include <sal/config.h>
+
+#include <utility>
+
+#include <vcl/dllapi.h>
+#include <vcl/bitmap.hxx>
+
+class BitmapEx;
+
+class VCL_DLLPUBLIC AlphaMask final
+{
+public:
+                AlphaMask();
+    explicit    AlphaMask( const Bitmap& rBitmap );
+                AlphaMask( const AlphaMask& rAlphaMask );
+                AlphaMask( AlphaMask&& rAlphaMask );
+    explicit    AlphaMask( const Size& rSizePixel, const sal_uInt8* pEraseTransparency = nullptr );
+                ~AlphaMask();
+
+    AlphaMask&  operator=( const Bitmap& rBitmap );
+    AlphaMask&  operator=( const AlphaMask& rAlphaMask ) { maBitmap = rAlphaMask.maBitmap; return *this; }
+    AlphaMask&  operator=( AlphaMask&& rAlphaMask ) noexcept { maBitmap = std::move(rAlphaMask.maBitmap); return *this; }
+    bool        operator==( const AlphaMask& rAlphaMask ) const { return maBitmap == rAlphaMask.maBitmap; }
+    bool        operator!=( const AlphaMask& rAlphaMask ) const { return maBitmap != rAlphaMask.maBitmap; }
+
+    Bitmap const & GetBitmap() const { return maBitmap; }
+
+    void        Erase( sal_uInt8 cTransparency );
+    void        BlendWith(const AlphaMask& rOther);
+
+    /** Perform boolean OR operation with another alpha-mask
+
+        @param rMask
+        The mask bitmap in the selected combine operation
+
+        @return true, if the operation was completed successfully.
+     */
+    bool        AlphaCombineOr( const AlphaMask& rMask );
+
+    // check if alpha is used, returns true if at least one pixel has transparence
+    bool        hasAlpha() const;
+
+    bool IsEmpty() const { return maBitmap.IsEmpty(); }
+
+    void SetEmpty() { maBitmap.SetEmpty(); }
+
+    vcl::PixelFormat getPixelFormat() const { return maBitmap.getPixelFormat(); }
+
+    sal_Int64 GetSizeBytes() const { return maBitmap.GetSizeBytes(); }
+
+    Size GetSizePixel() const { return maBitmap.GetSizePixel(); }
+
+    void SetPrefSize( const Size& rSize ) { maBitmap.SetPrefSize(rSize); }
+
+    void SetPrefMapMode( const MapMode& rMapMode ) { maBitmap.SetPrefMapMode(rMapMode); }
+
+    BitmapChecksum GetChecksum() const { return maBitmap.GetChecksum(); }
+
+    bool Invert();
+
+    bool Mirror( BmpMirrorFlags nMirrorFlags ) { return maBitmap.Mirror(nMirrorFlags); }
+
+    bool Scale( const Size& rNewSize, BmpScaleFlag nScaleFlag = BmpScaleFlag::Default ) { return maBitmap.Scale(rNewSize, nScaleFlag); }
+
+    bool Scale( const double& rScaleX, const double& rScaleY, BmpScaleFlag nScaleFlag = BmpScaleFlag::Default )
+    { return maBitmap.Scale(rScaleX, rScaleY, nScaleFlag); }
+
+    bool Convert( BmpConversion eConversion ) { return maBitmap.Convert(eConversion); }
+
+    vcl::Region CreateRegion( const Color& rColor, const tools::Rectangle& rRect ) const { return maBitmap.CreateRegion(rColor, rRect); }
+
+    bool Rotate( Degree10 nAngle10, const Color& rFillColor ) { return maBitmap.Rotate(nAngle10, rFillColor); }
+
+    bool Crop( const tools::Rectangle& rRectPixel ) { return maBitmap.Crop(rRectPixel); }
+
+    bool Expand( sal_Int32 nDX, sal_Int32 nDY, const Color* pInitColor = nullptr ) { return maBitmap.Expand(nDX, nDY, pInitColor); }
+
+    bool CopyPixel( const tools::Rectangle& rRectDst,
+                    const tools::Rectangle& rRectSrc )
+    { return maBitmap.CopyPixel(rRectDst, rRectSrc); }
+
+    bool CopyPixel( const tools::Rectangle& rRectDst,
+                    const tools::Rectangle& rRectSrc,
+                    const AlphaMask& rBmpSrc )
+    { return maBitmap.CopyPixel(rRectDst, rRectSrc, rBmpSrc.maBitmap); }
+
+    bool CopyPixel_AlphaOptimized(
+                    const tools::Rectangle& rRectDst,
+                    const tools::Rectangle& rRectSrc )
+    { return maBitmap.CopyPixel_AlphaOptimized(rRectDst, rRectSrc); }
+
+    bool CopyPixel_AlphaOptimized(
+                    const tools::Rectangle& rRectDst,
+                    const tools::Rectangle& rRectSrc,
+                    const AlphaMask& rBmpSrc )
+    { return maBitmap.CopyPixel_AlphaOptimized(rRectDst, rRectSrc, rBmpSrc); }
+
+private:
+    friend class BitmapEx;
+    friend class ::OutputDevice;
+    friend bool VCL_DLLPUBLIC ReadDIBBitmapEx(BitmapEx& rTarget, SvStream& rIStm, bool bFileHeader, bool bMSOFormat);
+
+    Bitmap maBitmap;
+};
+
+#endif // INCLUDED_VCL_ALPHA_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */