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diff --git a/vcl/inc/salgeom.hxx b/vcl/inc/salgeom.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_INC_SALGEOM_HXX
+#define INCLUDED_VCL_INC_SALGEOM_HXX
+
+#include <iostream>
+
+#include <vcl/dllapi.h>
+#include <vcl/WindowPosSize.hxx>
+#include <tools/long.hxx>
+
+// There are some unused functions, which I would keep to ease understanding.
+class SalFrameGeometry : public vcl::WindowPosSize
+{
+    // non-drawable area / margins / frame / decorations around the client area
+    sal_uInt32 m_nLeftDecoration, m_nTopDecoration, m_nRightDecoration, m_nBottomDecoration;
+    unsigned int m_nDisplayScreenNumber;
+
+public:
+    SalFrameGeometry()
+        : m_nLeftDecoration(0)
+        , m_nTopDecoration(0)
+        , m_nRightDecoration(0)
+        , m_nBottomDecoration(0)
+        , m_nDisplayScreenNumber(0)
+    {
+    }
+
+    constexpr sal_uInt32 leftDecoration() const { return m_nLeftDecoration; }
+    void setLeftDecoration(sal_uInt32 nLeftDecoration) { m_nLeftDecoration = nLeftDecoration; }
+    constexpr sal_uInt32 topDecoration() const { return m_nTopDecoration; }
+    void setTopDecoration(sal_uInt32 nTopDecoration) { m_nTopDecoration = nTopDecoration; }
+    constexpr sal_uInt32 rightDecoration() const { return m_nRightDecoration; }
+    void setRightDecoration(sal_uInt32 nRightDecoration) { m_nRightDecoration = nRightDecoration; }
+    constexpr sal_uInt32 bottomDecoration() const { return m_nBottomDecoration; }
+    void setBottomDecoration(sal_uInt32 nBottomDecoration)
+    {
+        m_nBottomDecoration = nBottomDecoration;
+    }
+    void setDecorations(sal_uInt32 nLeft, sal_uInt32 nTop, sal_uInt32 nRight, sal_uInt32 nBottom)
+    {
+        m_nLeftDecoration = nLeft;
+        m_nTopDecoration = nTop;
+        m_nRightDecoration = nRight;
+        m_nBottomDecoration = nBottom;
+    }
+
+    unsigned int screen() const { return m_nDisplayScreenNumber; }
+    void setScreen(unsigned int nScreen) { m_nDisplayScreenNumber = nScreen; }
+};
+
+inline std::ostream& operator<<(std::ostream& s, const SalFrameGeometry& rGeom)
+{
+    s << *static_cast<const vcl::WindowPosSize*>(&rGeom) << ":{" << rGeom.leftDecoration() << ","
+      << rGeom.topDecoration() << "," << rGeom.rightDecoration() << "," << rGeom.bottomDecoration()
+      << "}s" << rGeom.screen();
+    return s;
+}
+
+/// Interface used to share logic on sizing between
+/// SalVirtualDevices and SalFrames
+class VCL_PLUGIN_PUBLIC SalGeometryProvider
+{
+public:
+    virtual ~SalGeometryProvider() {}
+    virtual tools::Long GetWidth() const = 0;
+    virtual tools::Long GetHeight() const = 0;
+    virtual bool IsOffScreen() const = 0;
+};
+
+#endif // INCLUDED_VCL_INC_SALGEOM_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */