1 files changed, 93 insertions, 0 deletions
diff --git a/vcl/inc/ControlCacheKey.hxx b/vcl/inc/ControlCacheKey.hxx
new file mode 100644
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+++ b/vcl/inc/ControlCacheKey.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_CONTROLCACHEKEY_HXX
+#define INCLUDED_VCL_INC_CONTROLCACHEKEY_HXX
+
+#include <tools/gen.hxx>
+#include <vcl/salnativewidgets.hxx>
+#include <o3tl/hash_combine.hxx>
+
+class ControlCacheKey
+{
+public:
+    ControlType mnType;
+    ControlPart mnPart;
+    ControlState mnState;
+    Size maSize;
+
+    ControlCacheKey(ControlType nType, ControlPart nPart, ControlState nState, const Size& rSize)
+        : mnType(nType)
+        , mnPart(nPart)
+        , mnState(nState)
+        , maSize(rSize)
+    {
+    }
+
+    bool operator==(ControlCacheKey const& aOther) const
+    {
+        return mnType == aOther.mnType && mnPart == aOther.mnPart && mnState == aOther.mnState
+               && maSize.Width() == aOther.maSize.Width()
+               && maSize.Height() == aOther.maSize.Height();
+    }
+
+    bool canCacheControl() const
+    {
+        switch (mnType)
+        {
+            case ControlType::Checkbox:
+            case ControlType::Radiobutton:
+            case ControlType::ListNode:
+            case ControlType::Slider:
+            case ControlType::Progress:
+            // FIXME: these guys have complex state hidden in ImplControlValue
+            // structs which affects rendering, needs to be a and needs to be
+            // part of the key to our cache.
+            case ControlType::Spinbox:
+            case ControlType::SpinButtons:
+            case ControlType::TabItem:
+                return false;
+
+            case ControlType::Menubar:
+                if (mnPart == ControlPart::Entire)
+                    return false;
+                break;
+
+            default:
+                break;
+        }
+        return true;
+    }
+};
+
+struct ControlCacheHashFunction
+{
+    std::size_t operator()(ControlCacheKey const& aCache) const
+    {
+        std::size_t seed = 0;
+        o3tl::hash_combine(seed, aCache.mnType);
+        o3tl::hash_combine(seed, aCache.mnPart);
+        o3tl::hash_combine(seed, aCache.mnState);
+        o3tl::hash_combine(seed, aCache.maSize.Width());
+        o3tl::hash_combine(seed, aCache.maSize.Height());
+        return seed;
+    }
+};
+
+#endif // INCLUDED_VCL_INC_CONTROLCACHEKEY_HXX