1 files changed, 110 insertions, 0 deletions
diff --git a/sd/source/ui/tools/IconCache.cxx b/sd/source/ui/tools/IconCache.cxx
new file mode 100644
index 000000000..514e513a1
--- /dev/null
+++ b/sd/source/ui/tools/IconCache.cxx
@@ -0,0 +1,110 @@
+/* -*- 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 <memory>
+#include <tools/IconCache.hxx>
+
+#include <tools/debug.hxx>
+#include <osl/doublecheckedlocking.h>
+#include <osl/getglobalmutex.hxx>
+#include <unordered_map>
+
+namespace sd {
+
+//===== IconCache::Implementation =============================================
+
+class IconCache::Implementation
+{
+private:
+    friend class IconCache;
+
+    /** This pointer holds a valid reference from first time that
+        IconCache::Instance() is called to the end of the sd module when the
+        cache is destroyed from SdGlobalResourceContainer.
+    */
+    static IconCache* s_pIconCache;
+
+    typedef std::unordered_map<OUString, Image> ImageContainer;
+    ImageContainer maContainer;
+
+    Image GetIcon(const OUString& rResourceId);
+};
+
+IconCache* IconCache::Implementation::s_pIconCache = nullptr;
+
+Image IconCache::Implementation::GetIcon(const OUString& rResourceId)
+{
+    Image aResult;
+    ImageContainer::iterator iImage = maContainer.find(rResourceId);
+    if (iImage == maContainer.end())
+    {
+        aResult = Image(StockImage::Yes, rResourceId);
+        maContainer[rResourceId] = aResult;
+    }
+    else
+        aResult = iImage->second;
+    return aResult;
+}
+
+//===== IconCache =============================================================
+
+//static
+IconCache& IconCache::Instance()
+{
+    if (Implementation::s_pIconCache == nullptr)
+    {
+        ::osl::GetGlobalMutex aMutexFunctor;
+        ::osl::MutexGuard aGuard (aMutexFunctor());
+        if (Implementation::s_pIconCache == nullptr)
+        {
+            IconCache* pCache = new IconCache ();
+            SdGlobalResourceContainer::Instance().AddResource (
+                ::std::unique_ptr<SdGlobalResource>(pCache));
+            OSL_DOUBLE_CHECKED_LOCKING_MEMORY_BARRIER();
+            Implementation::s_pIconCache = pCache;
+        }
+    }
+    else
+    {
+        OSL_DOUBLE_CHECKED_LOCKING_MEMORY_BARRIER();
+    }
+
+    DBG_ASSERT(Implementation::s_pIconCache != nullptr,
+        "IconCache::Instance(): instance is NULL");
+    return *Implementation::s_pIconCache;
+}
+
+Image IconCache::GetIcon(const OUString& rResourceId)
+{
+    return mpImpl->GetIcon(rResourceId);
+}
+
+IconCache::IconCache()
+    : mpImpl (new Implementation)
+{
+}
+
+IconCache::~IconCache()
+{
+    // empty
+}
+
+} // end of namespace sd
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */