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 "dcpomatic_log.h"
  24 #include "font_config.h"
  25 #include <fontconfig/fontconfig.h>
  26 #include <boost/filesystem.hpp>
  27 #include <boost/optional.hpp>
  28
  29
  30 using std::string;
  31 using boost::optional;
  32
  33
  34 FontConfig* FontConfig::_instance;
  35
  36
  37 FontConfig::FontConfig()
  38 {
  39         _config = FcInitLoadConfigAndFonts();
  40         FcConfigSetCurrent(_config);
  41 }
  42
  43
  44 string
  45 FontConfig::make_font_available(boost::filesystem::path font_file)
  46 {
  47         auto existing = _available_fonts.find(font_file);
  48         if (existing != _available_fonts.end()) {
  49                 return existing->second;
  50         }
  51
  52         /* Make this font available to DCP-o-matic */
  53         optional<string> font_name;
  54         FcConfigAppFontAddFile (_config, reinterpret_cast<FcChar8 const *>(font_file.string().c_str()));
  55         auto pattern = FcPatternBuild (
  56                 0, FC_FILE, FcTypeString, font_file.string().c_str(), static_cast<char *>(0)
  57                 );
  58         auto object_set = FcObjectSetBuild (FC_FAMILY, FC_STYLE, FC_LANG, FC_FILE, static_cast<char *> (0));
  59         auto font_set = FcFontList (_config, pattern, object_set);
  60         if (font_set) {
  61                 for (int i = 0; i < font_set->nfont; ++i) {
  62                         FcPattern* font = font_set->fonts[i];
  63                         FcChar8* file;
  64                         FcChar8* family;
  65                         FcChar8* style;
  66                         if (
  67                                 FcPatternGetString (font, FC_FILE, 0, &file) == FcResultMatch &&
  68                                 FcPatternGetString (font, FC_FAMILY, 0, &family) == FcResultMatch &&
  69                                 FcPatternGetString (font, FC_STYLE, 0, &style) == FcResultMatch
  70                                 ) {
  71                                 font_name = reinterpret_cast<char const *> (family);
  72                         }
  73                 }
  74
  75                 FcFontSetDestroy (font_set);
  76         }
  77
  78         FcObjectSetDestroy (object_set);
  79         FcPatternDestroy (pattern);
  80
  81         DCPOMATIC_ASSERT(font_name);
  82
  83         _available_fonts[font_file] = *font_name;
  84
  85         FcConfigBuildFonts(_config);
  86         return *font_name;
  87 }
  88
  89
  90 optional<boost::filesystem::path>
  91 FontConfig::system_font_with_name(string name)
  92 {
  93         optional<boost::filesystem::path> path;
  94
  95         LOG_GENERAL("Searching system for font %1", name);
  96         auto pattern = FcNameParse(reinterpret_cast<FcChar8 const*>(name.c_str()));
  97         auto object_set = FcObjectSetBuild(FC_FILE, nullptr);
  98         auto font_set = FcFontList(_config, pattern, object_set);
  99         if (font_set) {
 100                 LOG_GENERAL("%1 candidate fonts found", font_set->nfont);
 101                 for (int i = 0; i < font_set->nfont; ++i) {
 102                         auto font = font_set->fonts[i];
 103                         FcChar8* file;
 104                         if (FcPatternGetString(font, FC_FILE, 0, &file) == FcResultMatch) {
 105                                 path = boost::filesystem::path(reinterpret_cast<char*>(file));
 106                                 LOG_GENERAL("Found %1", *path);
 107                                 break;
 108                         }
 109                 }
 110                 FcFontSetDestroy(font_set);
 111         } else {
 112                 LOG_GENERAL_NC("No candidate fonts found");
 113         }
 114
 115         FcObjectSetDestroy(object_set);
 116         FcPatternDestroy(pattern);
 117
 118         if (path) {
 119                 LOG_GENERAL("Searched system for font %1, found %2", name, *path);
 120         } else {
 121                 LOG_GENERAL("Searched system for font %1; nothing found", name);
 122         }
 123
 124         return path;
 125 }
 126
 127
 128 FontConfig *
 129 FontConfig::instance()
 130 {
 131         if (!_instance) {
 132                 _instance = new FontConfig();
 133         }
 134
 135         return _instance;
 136 }
 137