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diff --git a/chart2/source/inc/RelativeSizeHelper.hxx b/chart2/source/inc/RelativeSizeHelper.hxx
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+++ b/chart2/source/inc/RelativeSizeHelper.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_CHART2_SOURCE_INC_RELATIVESIZEHELPER_HXX
+#define INCLUDED_CHART2_SOURCE_INC_RELATIVESIZEHELPER_HXX
+
+#include "charttoolsdllapi.hxx"
+
+namespace com::sun::star::awt { struct Size; }
+namespace com::sun::star::beans { class XPropertySet; }
+namespace com::sun::star::uno { template <class interface_type> class Reference; }
+
+namespace chart
+{
+
+class OOO_DLLPUBLIC_CHARTTOOLS RelativeSizeHelper
+{
+public:
+    static double calculate(
+        double fValue,
+        const css::awt::Size & rOldReferenceSize,
+        const css::awt::Size & rNewReferenceSize );
+
+    static void adaptFontSizes(
+        const css::uno::Reference<
+            css::beans::XPropertySet > & xTargetProperties,
+        const css::awt::Size & rOldReferenceSize,
+        const css::awt::Size & rNewReferenceSize );
+
+private:
+    RelativeSizeHelper() = delete;
+};
+
+} //  namespace chart
+
+// INCLUDED_CHART2_SOURCE_INC_RELATIVESIZEHELPER_HXX
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */