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diff --git a/include/basegfx/utils/systemdependentdata.hxx b/include/basegfx/utils/systemdependentdata.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/.
+ */
+
+#pragma once
+
+#include <sal/types.h>
+#include <basegfx/basegfxdllapi.h>
+#include <memory>
+#include <map>
+
+namespace basegfx
+{
+ class SystemDependentData;
+ typedef std::shared_ptr<SystemDependentData> SystemDependentData_SharedPtr;
+ typedef std::weak_ptr<SystemDependentData> SystemDependentData_WeakPtr;
+
+ class BASEGFX_DLLPUBLIC SystemDependentDataManager
+ {
+ private:
+ // noncopyable
+ SystemDependentDataManager(const SystemDependentDataManager&) = delete;
+ SystemDependentDataManager& operator=(const SystemDependentDataManager&) = delete;
+
+ public:
+ SystemDependentDataManager();
+ virtual ~SystemDependentDataManager();
+
+ // call from (and with) SystemDependentData objects when start/end/touch
+ // usage is needed
+ virtual void startUsage(basegfx::SystemDependentData_SharedPtr& rData) = 0;
+ virtual void endUsage(basegfx::SystemDependentData_SharedPtr& rData) = 0;
+ virtual void touchUsage(basegfx::SystemDependentData_SharedPtr& rData) = 0;
+
+ // flush all buffered data (e.g. cleanup/shutdown)
+ virtual void flushAll() = 0;
+ };
+
+ class BASEGFX_DLLPUBLIC SystemDependentData
+ {
+ private:
+ // noncopyable
+ SystemDependentData(const SystemDependentData&) = delete;
+ SystemDependentData& operator=(const SystemDependentData&) = delete;
+
+ // reference to a SystemDependentDataManager, probably
+ // a single, globally used one, but not necessarily
+ SystemDependentDataManager& mrSystemDependentDataManager;
+
+ // Buffered CalculatedCycles, result of estimations using
+ // getHoldCyclesInSeconds and estimateUsageInBytes, executed
+ // using getHoldCyclesInSeconds. StartValue is 0 to detect
+ // not-yet-calculated state
+ sal_uInt32 mnCalculatedCycles;
+
+ public:
+ SystemDependentData(
+ SystemDependentDataManager& rSystemDependentDataManager);
+
+ // CAUTION! It is VERY important to keep this base class
+ // virtual, else typeid(class).hash_code() from derived classes
+ // will NOT work what is ESSENTIAL for the SystemDependentData
+ // mechanism to work properly. So DO NOT REMOVE virtual here, please.
+ virtual ~SystemDependentData();
+
+ // allow access to call startUsage/endUsage/touchUsage
+ // using getSystemDependentDataManager()
+ SystemDependentDataManager& getSystemDependentDataManager() { return mrSystemDependentDataManager; }
+
+ // Calculate HoldCyclesInSeconds based on using
+ // getHoldCyclesInSeconds and estimateUsageInBytes, the
+ // result is created once on-demand and buffered in
+ // mnCalculatedCycles
+ sal_uInt32 calculateCombinedHoldCyclesInSeconds() const;
+
+ // Allow read access to the calculated cycles in seconds, this
+ // can be e.g. used to determine if this instance got added
+ sal_uInt32 getCombinedHoldCyclesInSeconds() const { return mnCalculatedCycles; }
+
+ // Size estimation of the entry in bytes - does not have to
+ // be used, but should be. Default returns zero what
+ // means there is no size estimation available. Override to
+ // offer useful data if you want to have better caching.
+ virtual sal_Int64 estimateUsageInBytes() const;
+ };
+
+ class BASEGFX_DLLPUBLIC SystemDependentDataHolder
+ {
+ private:
+ // Possibility to hold System-Dependent B2DPolygon-Representations
+ std::map< size_t, SystemDependentData_WeakPtr > maSystemDependentReferences;
+
+ // noncopyable
+ SystemDependentDataHolder(const SystemDependentDataHolder&) = delete;
+ SystemDependentDataHolder& operator=(const SystemDependentDataHolder&) = delete;
+
+ public:
+ SystemDependentDataHolder();
+ virtual ~SystemDependentDataHolder();
+
+ void addOrReplaceSystemDependentData(SystemDependentData_SharedPtr& rData);
+ SystemDependentData_SharedPtr getSystemDependentData(size_t hash_code) const;
+ };
+} // end of namespace basegfx
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */