vcl/source/font/fontinstance.cxx

   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
  21 #include <hb-ot.h>
  22 #include <hb-graphite2.h>
  23
  24 #include <fontinstance.hxx>
  25 #include <impfontcache.hxx>
  26
  27 #include <PhysicalFontFace.hxx>
  28
  29 // extend std namespace to add custom hash needed for LogicalFontInstance
  30
  31 namespace std
  32 {
  33     template <> struct hash< pair< sal_UCS4, FontWeight > >
  34     {
  35         size_t operator()(const pair< sal_UCS4, FontWeight >& rData) const
  36         {
  37             std::size_t seed = 0;
  38             boost::hash_combine(seed, rData.first);
  39             boost::hash_combine(seed, rData.second);
  40             return seed;
  41         }
  42     };
  43 }
  44
  45
  46 LogicalFontInstance::LogicalFontInstance(const PhysicalFontFace& rFontFace, const FontSelectPattern& rFontSelData )
  47     : mxFontMetric( new ImplFontMetricData( rFontSelData ))
  48     , mpConversion( nullptr )
  49     , mnLineHeight( 0 )
  50     , mnOwnOrientation( 0 )
  51     , mnOrientation( 0 )
  52     , mbInit( false )
  53     , mpFontCache( nullptr )
  54     , m_aFontSelData(rFontSelData)
  55     , m_pHbFont(nullptr)
  56     , m_nAveWidthFactor(1.0f)
  57     , m_pFontFace(&const_cast<PhysicalFontFace&>(rFontFace))
  58 {
  59 }
  60
  61 LogicalFontInstance::~LogicalFontInstance()
  62 {
  63     mpUnicodeFallbackList.reset();
  64     mpFontCache = nullptr;
  65     mxFontMetric = nullptr;
  66
  67     if (m_pHbFont)
  68         hb_font_destroy(m_pHbFont);
  69 }
  70
  71 hb_font_t* LogicalFontInstance::InitHbFont(hb_face_t* pHbFace)
  72 {
  73     assert(pHbFace);
  74     hb_font_t* pHbFont = hb_font_create(pHbFace);
  75     unsigned int nUPEM = hb_face_get_upem(pHbFace);
  76     hb_font_set_scale(pHbFont, nUPEM, nUPEM);
  77     hb_ot_font_set_funcs(pHbFont);
  78     // hb_font_t keeps a reference to hb_face_t, so destroy this one.
  79     hb_face_destroy(pHbFace);
  80     return pHbFont;
  81 }
  82
  83 int LogicalFontInstance::GetKashidaWidth()
  84 {
  85     hb_font_t* pHbFont = GetHbFont();
  86     hb_position_t nWidth = 0;
  87     hb_codepoint_t nIndex = 0;
  88
  89     if (hb_font_get_glyph(pHbFont, 0x0640, 0, &nIndex))
  90     {
  91         double nXScale = 0;
  92         GetScale(&nXScale, nullptr);
  93         nWidth = hb_font_get_glyph_h_advance(pHbFont, nIndex) * nXScale;
  94     }
  95
  96     return nWidth;
  97 }
  98
  99 void LogicalFontInstance::GetScale(double* nXScale, double* nYScale)
 100 {
 101     hb_face_t* pHbFace = hb_font_get_face(GetHbFont());
 102     unsigned int nUPEM = hb_face_get_upem(pHbFace);
 103
 104     double nHeight(m_aFontSelData.mnHeight);
 105
 106     // On Windows, mnWidth is relative to average char width not font height,
 107     // and we need to keep it that way for GDI to correctly scale the glyphs.
 108     // Here we compensate for this so that HarfBuzz gives us the correct glyph
 109     // positions.
 110     double nWidth(m_aFontSelData.mnWidth ? m_aFontSelData.mnWidth * m_nAveWidthFactor : nHeight);
 111
 112     if (nYScale)
 113         *nYScale = nHeight / nUPEM;
 114
 115     if (nXScale)
 116         *nXScale = nWidth / nUPEM;
 117 }
 118
 119 void LogicalFontInstance::AddFallbackForUnicode( sal_UCS4 cChar, FontWeight eWeight, const OUString& rFontName )
 120 {
 121     if( !mpUnicodeFallbackList )
 122         mpUnicodeFallbackList.reset(new UnicodeFallbackList);
 123     (*mpUnicodeFallbackList)[ std::pair< sal_UCS4, FontWeight >(cChar,eWeight) ] = rFontName;
 124 }
 125
 126 bool LogicalFontInstance::GetFallbackForUnicode( sal_UCS4 cChar, FontWeight eWeight, OUString* pFontName ) const
 127 {
 128     if( !mpUnicodeFallbackList )
 129         return false;
 130
 131     UnicodeFallbackList::const_iterator it = mpUnicodeFallbackList->find( std::pair< sal_UCS4, FontWeight >(cChar,eWeight) );
 132     if( it == mpUnicodeFallbackList->end() )
 133         return false;
 134
 135     *pFontName = (*it).second;
 136     return true;
 137 }
 138
 139 void LogicalFontInstance::IgnoreFallbackForUnicode( sal_UCS4 cChar, FontWeight eWeight, const OUString& rFontName )
 140 {
 141     UnicodeFallbackList::iterator it = mpUnicodeFallbackList->find( std::pair< sal_UCS4,FontWeight >(cChar,eWeight) );
 142     if( it == mpUnicodeFallbackList->end() )
 143         return;
 144     if( (*it).second == rFontName )
 145         mpUnicodeFallbackList->erase( it );
 146 }
 147
 148 bool LogicalFontInstance::GetGlyphBoundRect(sal_GlyphId nID, tools::Rectangle &rRect, bool bVertical) const
 149 {
 150     if (mpFontCache && mpFontCache->GetCachedGlyphBoundRect(this, nID, rRect))
 151         return true;
 152
 153     bool res = ImplGetGlyphBoundRect(nID, rRect, bVertical);
 154     if (mpFontCache && res)
 155         mpFontCache->CacheGlyphBoundRect(this, nID, rRect);
 156     return res;
 157 }
 158
 159 bool LogicalFontInstance::IsGraphiteFont()
 160 {
 161     if (!m_xbIsGraphiteFont)
 162     {
 163         m_xbIsGraphiteFont = hb_graphite2_face_get_gr_face(hb_font_get_face(GetHbFont())) != nullptr;
 164     }
 165     return *m_xbIsGraphiteFont;
 166 }
 167
 168 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */