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diff --git a/vcl/inc/implimagetree.hxx b/vcl/inc/implimagetree.hxx
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+++ b/vcl/inc/implimagetree.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_IMPLIMAGETREE_HXX
+#define INCLUDED_VCL_INC_IMPLIMAGETREE_HXX
+
+#include <sal/config.h>
+
+#include <memory>
+#include <unordered_map>
+#include <utility>
+#include <vector>
+
+#include <com/sun/star/uno/Reference.hxx>
+#include <rtl/ustring.hxx>
+#include <vcl/bitmapex.hxx>
+#include <i18nlangtag/languagetag.hxx>
+#include <vcl/ImageTree.hxx>
+
+namespace com::sun::star::container {
+    class XNameAccess;
+}
+
+struct ImageRequestParameters
+{
+    OUString msName;
+    OUString msStyle;
+    BitmapEx& mrBitmap;
+    bool mbLocalized;
+    ImageLoadFlags meFlags;
+    bool mbWriteImageToCache;
+    sal_Int32 mnScalePercentage;
+
+    ImageRequestParameters(const OUString & rName, const OUString & rStyle, BitmapEx& rBitmap, bool bLocalized,
+                           ImageLoadFlags eFlags, sal_Int32 nScalePercentage)
+        : msName(rName)
+        , msStyle(rStyle)
+        , mrBitmap(rBitmap)
+        , mbLocalized(bLocalized)
+        , meFlags(eFlags)
+        , mbWriteImageToCache(false)
+        , mnScalePercentage(nScalePercentage)
+    {}
+
+    bool convertToDarkTheme();
+    sal_Int32 scalePercentage();
+};
+
+class ImplImageTree
+{
+public:
+    ImplImageTree();
+    ~ImplImageTree();
+
+    OUString getImageUrl(
+        OUString const & name, OUString const & style, OUString const & lang);
+
+    std::shared_ptr<SvMemoryStream> getImageStream(
+        OUString const & rName, OUString const & rStyle, OUString const & rLang);
+
+    bool loadImage(
+        OUString const & name, OUString const & style,
+        BitmapEx & bitmap, bool localized,
+        const ImageLoadFlags eFlags,
+        sal_Int32 nScalePercentage = -1);
+
+    /** a crude form of life cycle control (called from DeInitVCL; otherwise,
+     *  if the ImplImageTree singleton were destroyed during exit that would
+     *  be too late for the destructors of the bitmaps in maIconCache)*/
+    void shutdown();
+
+    css::uno::Reference< css::container::XNameAccess > const & getNameAccess();
+
+private:
+    ImplImageTree(const ImplImageTree&) = delete;
+    ImplImageTree& operator=(const ImplImageTree&) = delete;
+
+    typedef std::unordered_map<OUString, std::pair<bool,BitmapEx>> IconCache;
+    typedef std::unordered_map<sal_Int32, std::unique_ptr<IconCache>> ScaledIconCache;
+    typedef std::unordered_map<OUString, OUString> IconLinkHash;
+
+    struct IconSet
+    {
+        OUString maURL;
+        css::uno::Reference<css::container::XNameAccess> maNameAccess;
+        ScaledIconCache maScaledIconCaches;
+        IconLinkHash maLinkHash;
+
+        IconSet()
+        {}
+
+        IconSet(const OUString & rURL)
+            : maURL(rURL)
+        {}
+    };
+
+    /// Remember all the (used) icon styles and individual icons in them.
+    /// Map between the theme name(s) and the content.
+    std::unordered_map<OUString, IconSet> maIconSets;
+
+    /// Style used for the current operations; switches switch several times during fallback search.
+    OUString maCurrentStyle;
+
+    IconSet& getCurrentIconSet()
+    {
+        return maIconSets[maCurrentStyle];
+    }
+
+    bool doLoadImage(ImageRequestParameters& rParameters);
+
+    std::vector<OUString> getPaths(OUString const & name, LanguageTag const & rLanguageTag);
+
+    bool checkPathAccess();
+
+    void setStyle(OUString const & rStyle);
+
+    void createStyle();
+
+    IconCache &getIconCache(const ImageRequestParameters& rParameters);
+
+    bool iconCacheLookup(ImageRequestParameters& rParameters);
+
+    bool findImage(std::vector<OUString> const & rPaths, ImageRequestParameters& rParameters);
+
+    void loadImageLinks();
+
+    void parseLinkFile(std::shared_ptr<SvStream> const & aStream);
+
+    /// Return name of a real .png according to links.txt.
+    OUString const & getRealImageName(OUString const & rName);
+
+
+    /** Return name of the fallback style for the provided one.
+
+        Must not be cyclic :-)  The last theme in the chain returns an empty string.
+    */
+    static OUString fallbackStyle(const OUString &rStyle);
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */