src/lib/font_config.cc

   1 /*
   2     Copyright (C) 2014-2021 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of DCP-o-matic.
   5
   6     DCP-o-matic is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     DCP-o-matic is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 */
  20
  21
  22 #include "dcpomatic_assert.h"
  23 #include "font_config.h"
  24 #include <fontconfig/fontconfig.h>
  25 #include <boost/filesystem.hpp>
  26 #include <boost/optional.hpp>
  27
  28
  29 using std::string;
  30 using boost::optional;
  31
  32
  33 FontConfig* FontConfig::_instance;
  34
  35
  36 FontConfig::FontConfig()
  37 {
  38         _config = FcInitLoadConfigAndFonts();
  39         FcConfigSetCurrent(_config);
  40 }
  41
  42
  43 string
  44 FontConfig::make_font_available(boost::filesystem::path font_file)
  45 {
  46         auto existing = _available_fonts.find(font_file);
  47         if (existing != _available_fonts.end()) {
  48                 return existing->second;
  49         }
  50
  51         /* Make this font available to DCP-o-matic */
  52         optional<string> font_name;
  53         FcConfigAppFontAddFile (_config, reinterpret_cast<FcChar8 const *>(font_file.string().c_str()));
  54         auto pattern = FcPatternBuild (
  55                 0, FC_FILE, FcTypeString, font_file.string().c_str(), static_cast<char *>(0)
  56                 );
  57         auto object_set = FcObjectSetBuild (FC_FAMILY, FC_STYLE, FC_LANG, FC_FILE, static_cast<char *> (0));
  58         auto font_set = FcFontList (_config, pattern, object_set);
  59         if (font_set) {
  60                 for (int i = 0; i < font_set->nfont; ++i) {
  61                         FcPattern* font = font_set->fonts[i];
  62                         FcChar8* file;
  63                         FcChar8* family;
  64                         FcChar8* style;
  65                         if (
  66                                 FcPatternGetString (font, FC_FILE, 0, &file) == FcResultMatch &&
  67                                 FcPatternGetString (font, FC_FAMILY, 0, &family) == FcResultMatch &&
  68                                 FcPatternGetString (font, FC_STYLE, 0, &style) == FcResultMatch
  69                                 ) {
  70                                 font_name = reinterpret_cast<char const *> (family);
  71                         }
  72                 }
  73
  74                 FcFontSetDestroy (font_set);
  75         }
  76
  77         FcObjectSetDestroy (object_set);
  78         FcPatternDestroy (pattern);
  79
  80         DCPOMATIC_ASSERT(font_name);
  81
  82         _available_fonts[font_file] = *font_name;
  83
  84         FcConfigBuildFonts(_config);
  85         return *font_name;
  86 }
  87
  88
  89 optional<boost::filesystem::path>
  90 FontConfig::system_font_with_name(string name)
  91 {
  92         optional<boost::filesystem::path> path;
  93
  94         auto pattern = FcNameParse(reinterpret_cast<FcChar8 const*>(name.c_str()));
  95         auto object_set = FcObjectSetBuild(FC_FILE, nullptr);
  96         auto font_set = FcFontList(_config, pattern, object_set);
  97         if (font_set) {
  98                 for (int i = 0; i < font_set->nfont; ++i) {
  99                         auto font = font_set->fonts[i];
 100                         FcChar8* file;
 101                         if (FcPatternGetString(font, FC_FILE, 0, &file) == FcResultMatch) {
 102                                 path = boost::filesystem::path(reinterpret_cast<char*>(file));
 103                                 break;
 104                         }
 105                 }
 106                 FcFontSetDestroy(font_set);
 107         }
 108
 109         FcObjectSetDestroy(object_set);
 110         FcPatternDestroy(pattern);
 111
 112         return path;
 113 }
 114
 115
 116 FontConfig *
 117 FontConfig::instance()
 118 {
 119         if (!_instance) {
 120                 _instance = new FontConfig();
 121         }
 122
 123         return _instance;
 124 }
 125