1 files changed, 75 insertions, 0 deletions
diff --git a/vcl/source/text/TextLayoutCache.cxx b/vcl/source/text/TextLayoutCache.cxx
new file mode 100644
index 000000000..1d3e8e504
--- /dev/null
+++ b/vcl/source/text/TextLayoutCache.cxx
@@ -0,0 +1,75 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * 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 <TextLayoutCache.hxx>
+
+#include <scrptrun.h>
+
+#include <o3tl/hash_combine.hxx>
+#include <o3tl/lru_map.hxx>
+#include <unotools/configmgr.hxx>
+#include <vcl/lazydelete.hxx>
+#include <officecfg/Office/Common.hxx>
+
+namespace vcl::text
+{
+TextLayoutCache::TextLayoutCache(sal_Unicode const* pStr, sal_Int32 const nEnd)
+{
+    vcl::ScriptRun aScriptRun(reinterpret_cast<const UChar*>(pStr), nEnd);
+    while (aScriptRun.next())
+    {
+        runs.emplace_back(aScriptRun.getScriptStart(), aScriptRun.getScriptEnd(),
+                          aScriptRun.getScriptCode());
+    }
+}
+
+namespace
+{
+struct TextLayoutCacheCost
+{
+    size_t operator()(const std::shared_ptr<const TextLayoutCache>& item) const
+    {
+        return item->runs.size() * sizeof(item->runs.front());
+    }
+};
+} // namespace
+
+std::shared_ptr<const TextLayoutCache> TextLayoutCache::Create(OUString const& rString)
+{
+    typedef o3tl::lru_map<OUString, std::shared_ptr<const TextLayoutCache>, FirstCharsStringHash,
+                          FastStringCompareEqual, TextLayoutCacheCost>
+        Cache;
+    static vcl::DeleteOnDeinit<Cache> cache(
+        !utl::ConfigManager::IsFuzzing()
+            ? officecfg::Office::Common::Cache::Font::TextRunsCacheSize::get()
+            : 100);
+    if (Cache* map = cache.get())
+    {
+        auto it = map->find(rString);
+        if (it != map->end())
+            return it->second;
+        auto ret = std::make_shared<const TextLayoutCache>(rString.getStr(), rString.getLength());
+        map->insert({ rString, ret });
+        return ret;
+    }
+    return std::make_shared<const TextLayoutCache>(rString.getStr(), rString.getLength());
+}
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */