vcl/inc/impfontcache.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   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 #ifndef INCLUDED_VCL_INC_IMPFONTCACHE_HXX
  21 #define INCLUDED_VCL_INC_IMPFONTCACHE_HXX
  22
  23 #include <unordered_map>
  24
  25 #include "fontselect.hxx"
  26
  27 class Size;
  28 namespace vcl { class Font; }
  29 class PhysicalFontCollection;
  30
  31
  32 // TODO: closely couple with PhysicalFontCollection
  33
  34 class ImplFontCache
  35 {
  36 private:
  37     LogicalFontInstance* mpFirstEntry;
  38     int                  mnRef0Count;    // number of unreferenced LogicalFontInstances
  39
  40     // cache of recently used font instances
  41     struct IFSD_Equal { bool operator()( const FontSelectPattern&, const FontSelectPattern& ) const; };
  42     struct IFSD_Hash { size_t operator()( const FontSelectPattern& ) const; };
  43     typedef std::unordered_map<FontSelectPattern,LogicalFontInstance*,IFSD_Hash,IFSD_Equal > FontInstanceList;
  44     FontInstanceList    maFontInstanceList;
  45
  46     int                 CountUnreferencedEntries() const;
  47
  48 public:
  49                         ImplFontCache();
  50                         ~ImplFontCache();
  51
  52     LogicalFontInstance* GetFontInstance( PhysicalFontCollection*,
  53                              const vcl::Font&, const Size& rPixelSize, float fExactHeight);
  54     LogicalFontInstance* GetFontInstance( PhysicalFontCollection*, FontSelectPattern& );
  55     LogicalFontInstance* GetGlyphFallbackFont( PhysicalFontCollection*, FontSelectPattern&,
  56                             int nFallbackLevel, OUString& rMissingCodes );
  57
  58     /// Increase the refcount of the given LogicalFontInstance.
  59     void                Acquire(LogicalFontInstance*);
  60     /// Decrease the refcount and potentially cleanup the entries with zero refcount from the cache.
  61     void                Release(LogicalFontInstance*);
  62
  63     void                Invalidate();
  64 };
  65
  66 #endif // INCLUDED_VCL_INC_IMPFONTCACHE_HXX
  67
  68 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */