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
  24 #include <rtl/ref.hxx>
  25 #include <o3tl/lru_map.hxx>
  26 #include <o3tl/hash_combine.hxx>
  27 #include <tools/gen.hxx>
  28 #include <vcl/glyphitem.hxx>
  29
  30 #include "fontselect.hxx"
  31
  32 class Size;
  33 namespace vcl { class Font; }
  34 class PhysicalFontCollection;
  35
  36 // TODO: closely couple with PhysicalFontCollection
  37
  38 struct GlyphBoundRectCacheKey
  39 {
  40     const LogicalFontInstance* m_pFont;
  41     const sal_GlyphId m_nId;
  42
  43     GlyphBoundRectCacheKey(const LogicalFontInstance* pFont, sal_GlyphId nID)
  44         : m_pFont(pFont), m_nId(nID)
  45     {}
  46
  47     bool operator==(GlyphBoundRectCacheKey const& aOther) const
  48     { return m_pFont == aOther.m_pFont && m_nId == aOther.m_nId; }
  49 };
  50
  51 struct GlyphBoundRectCacheHash
  52 {
  53     std::size_t operator()(GlyphBoundRectCacheKey const& aCache) const
  54     {
  55         std::size_t seed = 0;
  56         o3tl::hash_combine(seed, aCache.m_pFont);
  57         o3tl::hash_combine(seed, aCache.m_nId);
  58         return seed;
  59     }
  60 };
  61
  62 typedef o3tl::lru_map<GlyphBoundRectCacheKey, tools::Rectangle,
  63                       GlyphBoundRectCacheHash> GlyphBoundRectCache;
  64
  65 class ImplFontCache
  66 {
  67 private:
  68     // cache of recently used font instances
  69     struct IFSD_Equal { bool operator()( const FontSelectPattern&, const FontSelectPattern& ) const; };
  70     struct IFSD_Hash { size_t operator()( const FontSelectPattern& ) const; };
  71     typedef o3tl::lru_map<FontSelectPattern, rtl::Reference<LogicalFontInstance>, IFSD_Hash, IFSD_Equal> FontInstanceList;
  72
  73     LogicalFontInstance* mpLastHitCacheEntry; ///< keeps the last hit cache entry
  74     FontInstanceList maFontInstanceList;
  75     GlyphBoundRectCache m_aBoundRectCache;
  76
  77     rtl::Reference<LogicalFontInstance> GetFontInstance(PhysicalFontCollection const*, FontSelectPattern&);
  78
  79 public:
  80     ImplFontCache();
  81     ~ImplFontCache();
  82
  83     rtl::Reference<LogicalFontInstance> GetFontInstance(PhysicalFontCollection const *,
  84                              const vcl::Font&, const Size& rPixelSize, float fExactHeight, bool bNonAntialias = false);
  85     rtl::Reference<LogicalFontInstance> GetGlyphFallbackFont( PhysicalFontCollection const *, FontSelectPattern&,
  86                             LogicalFontInstance* pLogicalFont,
  87                             int nFallbackLevel, OUString& rMissingCodes );
  88
  89     bool GetCachedGlyphBoundRect(const LogicalFontInstance *, sal_GlyphId, tools::Rectangle &);
  90     void CacheGlyphBoundRect(const LogicalFontInstance *, sal_GlyphId, tools::Rectangle &);
  91
  92     void                Invalidate();
  93 };
  94
  95 #endif // INCLUDED_VCL_INC_IMPFONTCACHE_HXX
  96
  97 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */