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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 <tools/long.hxx>
+
+struct SalFrameGeometry {
+    // screen position of upper left corner of drawable area in pixel
+    tools::Long                nX, nY;
+    // dimensions of the drawable area in pixel
+    tools::ULong        nWidth, nHeight;
+    // thickness of the decoration in pixel
+    tools::ULong        nLeftDecoration,
+                        nTopDecoration,
+                        nRightDecoration,
+                        nBottomDecoration;
+    unsigned int        nDisplayScreenNumber;
+
+    SalFrameGeometry() :
+        nX( 0 ),
+        nY( 0 ),
+        nWidth( 1 ),
+        nHeight( 1 ),
+        nLeftDecoration( 0 ),
+        nTopDecoration( 0 ),
+        nRightDecoration( 0 ),
+        nBottomDecoration( 0 ),
+        nDisplayScreenNumber( 0 )
+    {}
+};
+
+inline std::ostream &operator <<(std::ostream& s, const SalFrameGeometry& rGeom)
+{
+    s << rGeom.nWidth << "x" << rGeom.nHeight << "@(" << rGeom.nX << "," << rGeom.nY << "):{"
+      << rGeom.nLeftDecoration << "," << rGeom.nTopDecoration << "," << rGeom.nRightDecoration << "," << rGeom.nBottomDecoration << "}";
+
+    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: */