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diff --git a/vcl/inc/font/fontsubstitution.hxx b/vcl/inc/font/fontsubstitution.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * 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 .
+ */
+
+// nowadays these substitutions are needed for backward compatibility and tight platform integration:
+// - substitutions from configuration entries (Tools->Options->FontReplacement and/or fontconfig)
+// - device specific substitutions (e.g. for PS printer builtin fonts)
+// - substitutions for missing fonts defined by configuration entries (generic and/or platform dependent fallbacks)
+// - substitutions for missing fonts defined by multi-token fontnames (e.g. fontname="SpecialFont;FallbackA;FallbackB")
+// - substitutions for incomplete fonts (implicit, generic, EUDC and/or platform dependent fallbacks)
+// - substitutions for missing symbol fonts by translating code points into other symbol fonts
+
+#pragma once
+
+#include <sal/config.h>
+
+#include <rtl/ustring.hxx>
+
+#include <font/FontSelectPattern.hxx>
+
+namespace vcl::font
+{
+class FontSelectPattern;
+
+class FontSubstitution
+{
+    // TODO: there is more commonality between the different substitutions
+protected:
+    virtual ~FontSubstitution() {}
+};
+
+/// Abstracts the concept of finding the best font to support an incomplete font
+class GlyphFallbackFontSubstitution : public FontSubstitution
+{
+public:
+    virtual bool FindFontSubstitute(vcl::font::FontSelectPattern&,
+                                    LogicalFontInstance* pLogicalFont,
+                                    OUString& rMissingCodes) const = 0;
+};
+
+/** Abstracts the concept of a configured font substitution before the
+    availability of the originally selected font has been checked.
+ */
+class PreMatchFontSubstitution : public FontSubstitution
+{
+public:
+    virtual bool FindFontSubstitute(vcl::font::FontSelectPattern&) const = 0;
+};
+
+void ImplFontSubstitute(OUString& rFontName);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */