vcl/source/text/TextLayoutCache.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <TextLayoutCache.hxx>
  21
  22 #include <scrptrun.h>
  23
  24 #include <o3tl/hash_combine.hxx>
  25 #include <o3tl/lru_map.hxx>
  26 #include <unotools/configmgr.hxx>
  27 #include <vcl/lazydelete.hxx>
  28 #include <officecfg/Office/Common.hxx>
  29
  30 namespace vcl::text
  31 {
  32 TextLayoutCache::TextLayoutCache(sal_Unicode const* pStr, sal_Int32 const nEnd)
  33 {
  34     vcl::ScriptRun aScriptRun(reinterpret_cast<const UChar*>(pStr), nEnd);
  35     while (aScriptRun.next())
  36     {
  37         runs.emplace_back(aScriptRun.getScriptStart(), aScriptRun.getScriptEnd(),
  38                           aScriptRun.getScriptCode());
  39     }
  40 }
  41
  42 namespace
  43 {
  44 struct TextLayoutCacheCost
  45 {
  46     size_t operator()(const std::shared_ptr<const TextLayoutCache>& item) const
  47     {
  48         return item->runs.size() * sizeof(item->runs.front());
  49     }
  50 };
  51 } // namespace
  52
  53 std::shared_ptr<const TextLayoutCache> TextLayoutCache::Create(OUString const& rString)
  54 {
  55     typedef o3tl::lru_map<OUString, std::shared_ptr<const TextLayoutCache>, FirstCharsStringHash,
  56                           FastStringCompareEqual, TextLayoutCacheCost>
  57         Cache;
  58     static vcl::DeleteOnDeinit<Cache> cache(
  59         !utl::ConfigManager::IsFuzzing()
  60             ? officecfg::Office::Common::Cache::Font::TextRunsCacheSize::get()
  61             : 100);
  62     if (Cache* map = cache.get())
  63     {
  64         auto it = map->find(rString);
  65         if (it != map->end())
  66             return it->second;
  67         auto ret = std::make_shared<const TextLayoutCache>(rString.getStr(), rString.getLength());
  68         map->insert({ rString, ret });
  69         return ret;
  70     }
  71     return std::make_shared<const TextLayoutCache>(rString.getStr(), rString.getLength());
  72 }
  73 }
  74
  75 /* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */