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 #include <PhysicalFontFace.hxx>
  27
  28 #include <o3tl/hash_combine.hxx>
  29
  30 // extend std namespace to add custom hash needed for LogicalFontInstance
  31
  32 namespace std
  33 {
  34     template <> struct hash< pair< sal_UCS4, FontWeight > >
  35     {
  36         size_t operator()(const pair< sal_UCS4, FontWeight >& rData) const
  37         {
  38             std::size_t seed = 0;
  39             o3tl::hash_combine(seed, rData.first);
  40             o3tl::hash_combine(seed, rData.second);
  41             return seed;
  42         }
  43     };
  44 }
  45
  46
  47 LogicalFontInstance::LogicalFontInstance(const PhysicalFontFace& rFontFace, const FontSelectPattern& rFontSelData )
  48     : mxFontMetric( new ImplFontMetricData( rFontSelData ))
  49     , mpConversion( nullptr )
  50     , mnLineHeight( 0 )
  51     , mnOwnOrientation( 0 )
  52     , mnOrientation( 0 )
  53     , mbInit( false )
  54     , mpFontCache( nullptr )
  55     , m_aFontSelData(rFontSelData)
  56     , m_pHbFont(nullptr)
  57     , m_nAveWidthFactor(1.0f)
  58     , m_pFontFace(&const_cast<PhysicalFontFace&>(rFontFace))
  59 {
  60 }
  61
  62 LogicalFontInstance::~LogicalFontInstance()
  63 {
  64     mpUnicodeFallbackList.reset();
  65     mpFontCache = nullptr;
  66     mxFontMetric = nullptr;
  67
  68     if (m_pHbFont)
  69         hb_font_destroy(m_pHbFont);
  70 }
  71
  72 hb_font_t* LogicalFontInstance::InitHbFont(hb_face_t* pHbFace)
  73 {
  74     assert(pHbFace);
  75     hb_font_t* pHbFont = hb_font_create(pHbFace);
  76     unsigned int nUPEM = hb_face_get_upem(pHbFace);
  77     hb_font_set_scale(pHbFont, nUPEM, nUPEM);
  78     hb_ot_font_set_funcs(pHbFont);
  79     // hb_font_t keeps a reference to hb_face_t, so destroy this one.
  80     hb_face_destroy(pHbFace);
  81     return pHbFont;
  82 }
  83
  84 int LogicalFontInstance::GetKashidaWidth()
  85 {
  86     hb_font_t* pHbFont = GetHbFont();
  87     hb_position_t nWidth = 0;
  88     hb_codepoint_t nIndex = 0;
  89
  90     if (hb_font_get_glyph(pHbFont, 0x0640, 0, &nIndex))
  91     {
  92         double nXScale = 0;
  93         GetScale(&nXScale, nullptr);
  94         nWidth = hb_font_get_glyph_h_advance(pHbFont, nIndex) * nXScale;
  95     }
  96
  97     return nWidth;
  98 }
  99
 100 void LogicalFontInstance::GetScale(double* nXScale, double* nYScale)
 101 {
 102     hb_face_t* pHbFace = hb_font_get_face(GetHbFont());
 103     unsigned int nUPEM = hb_face_get_upem(pHbFace);
 104
 105     double nHeight(m_aFontSelData.mnHeight);
 106
 107     // On Windows, mnWidth is relative to average char width not font height,
 108     // and we need to keep it that way for GDI to correctly scale the glyphs.
 109     // Here we compensate for this so that HarfBuzz gives us the correct glyph
 110     // positions.
 111     double nWidth(m_aFontSelData.mnWidth ? m_aFontSelData.mnWidth * m_nAveWidthFactor : nHeight);
 112
 113     if (nYScale)
 114         *nYScale = nHeight / nUPEM;
 115
 116     if (nXScale)
 117         *nXScale = nWidth / nUPEM;
 118 }
 119
 120 void LogicalFontInstance::AddFallbackForUnicode( sal_UCS4 cChar, FontWeight eWeight, const OUString& rFontName )
 121 {
 122     if( !mpUnicodeFallbackList )
 123         mpUnicodeFallbackList.reset(new UnicodeFallbackList);
 124     (*mpUnicodeFallbackList)[ std::pair< sal_UCS4, FontWeight >(cChar,eWeight) ] = rFontName;
 125 }
 126
 127 bool LogicalFontInstance::GetFallbackForUnicode( sal_UCS4 cChar, FontWeight eWeight, OUString* pFontName ) const
 128 {
 129     if( !mpUnicodeFallbackList )
 130         return false;
 131
 132     UnicodeFallbackList::const_iterator it = mpUnicodeFallbackList->find( std::pair< sal_UCS4, FontWeight >(cChar,eWeight) );
 133     if( it == mpUnicodeFallbackList->end() )
 134         return false;
 135
 136     *pFontName = (*it).second;
 137     return true;
 138 }
 139
 140 void LogicalFontInstance::IgnoreFallbackForUnicode( sal_UCS4 cChar, FontWeight eWeight, std::u16string_view rFontName )
 141 {
 142     UnicodeFallbackList::iterator it = mpUnicodeFallbackList->find( std::pair< sal_UCS4,FontWeight >(cChar,eWeight) );
 143     if( it == mpUnicodeFallbackList->end() )
 144         return;
 145     if( (*it).second == rFontName )
 146         mpUnicodeFallbackList->erase( it );
 147 }
 148
 149 bool LogicalFontInstance::GetGlyphBoundRect(sal_GlyphId nID, tools::Rectangle &rRect, bool bVertical) const
 150 {
 151     if (mpFontCache && mpFontCache->GetCachedGlyphBoundRect(this, nID, rRect))
 152         return true;
 153
 154     bool res = ImplGetGlyphBoundRect(nID, rRect, bVertical);
 155     if (mpFontCache && res)
 156         mpFontCache->CacheGlyphBoundRect(this, nID, rRect);
 157     return res;
 158 }
 159
 160 bool LogicalFontInstance::IsGraphiteFont()
 161 {
 162     if (!m_xbIsGraphiteFont)
 163     {
 164         m_xbIsGraphiteFont = hb_graphite2_face_get_gr_face(hb_font_get_face(GetHbFont())) != nullptr;
 165     }
 166     return *m_xbIsGraphiteFont;
 167 }
 168
 169 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */