tdf#103680: Implement fallback logic for OpenTypeNode

Change-Id: Idf225fbfb2b761dcd0d230242215e875217f02da
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/209083
Reviewed-by: Khaled Hosny <khaled@libreoffice.org>
Tested-by: Jenkins

starmath/Library_sm.mk

@@ -82,6 +82,7 @@ $(eval $(call gb_Library_add_exception_objects,sm,\
         starmath/source/format \
         starmath/source/mathtype \
         starmath/source/node \
+        starmath/source/OpenTypeNode\
         starmath/source/ooxmlexport \
         starmath/source/ooxmlimport \
         starmath/source/rtfexport \

starmath/inc/node.hxx

@@ -310,6 +310,7 @@ public:
      * @return
      */
     virtual void Arrange(OutputDevice &rDev, const SmFormat &rFormat) = 0;
+    virtual void ArrangeOpenType(OutputDevice &rDev, const SmFormat &rFormat);
 
     /**
      * Appends to rText the node text.

starmath/source/OpenTypeNode.cxx

@@ -0,0 +1,28 @@
+/* -*- 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 .
+ */
+
+#include <node.hxx>
+
+void SmNode::ArrangeOpenType(OutputDevice& rDev, const SmFormat& rFormat)
+{
+    // Fallback: Default to legacy arrange if OpenType is not implemented
+    Arrange(rDev, rFormat);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

starmath/source/document.cxx

@@ -278,7 +278,11 @@ void SmDocShell::ArrangeFormula()
     // Numbers should not be converted, for now.
     pOutDev->SetDigitLanguage( LANGUAGE_ENGLISH );
 
-    mpTree->Arrange(*pOutDev, rFormat);
+    if (pOutDev->SupportsOpenTypeMath())
+        mpTree->ArrangeOpenType(*pOutDev, rFormat);
+    else
+        mpTree->Arrange(*pOutDev, rFormat);
+
 
     pOutDev->EnableRTL(bOldRTL);