fontconfig.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2021 Ola Rinta-Koski
 * Copyright (C) 2021-2022 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
 
#include <font/fontconfig.h>
#include <wx/log.h>
#include <trace_helpers.h>
#include <string_utils.h>
#include <macros.h>
#include <cstdint>
 
using namespace fontconfig;
 
static FONTCONFIG* g_config = nullptr;
 
struct fontconfig::FONTCONFIG_PAT
{
 FcPattern* pat;
};
 
 
wxString FONTCONFIG::Version()
{
 return wxString::Format( "%d.%d.%d", FC_MAJOR, FC_MINOR, FC_REVISION );
}
 
 
FONTCONFIG::FONTCONFIG()
{
};
 
 
FONTCONFIG* Fontconfig()
{
 if( !g_config )
 {
 FcInit();
 g_config = new FONTCONFIG();
 }
 
 return g_config;
}
 
 
bool FONTCONFIG::isLanguageMatch( const wxString& aSearchLang, const wxString& aSupportedLang )
{
 if( aSearchLang.Lower() == aSupportedLang.Lower() )
 return true;
 
 if( aSupportedLang.empty() )
 return false;
 
 if( aSearchLang.empty() )
 return false;
 
 wxArrayString supportedLangBits;
 wxStringSplit( aSupportedLang.Lower(), supportedLangBits, wxS( '-' ) );
 
 wxArrayString searhcLangBits;
 wxStringSplit( aSearchLang.Lower(), searhcLangBits, wxS( '-' ) );
 
 // if either side of the comparison have only one section, then its a broad match but fine
 // i.e. the haystack is declaring broad support or the search language is broad
 if( searhcLangBits.size() == 1 || supportedLangBits.size() == 1 )
 {
 return searhcLangBits[0] == supportedLangBits[0];
 }
 
 // the full two part comparison should have passed the initial shortcut
 
 return false;
}
 
 
std::string FONTCONFIG::getFcString( FONTCONFIG_PAT& aPat, const char* aObj, int aIdx )
{
 FcChar8* str;
 std::string res;
 
 if( FcPatternGetString( aPat.pat, aObj, aIdx, &str ) == FcResultMatch )
 res = std::string( reinterpret_cast<char*>( str ) );
 
 return res;
}
 
 
void FONTCONFIG::getAllFamilyStrings( FONTCONFIG_PAT& aPat,
 std::unordered_map<std::string, std::string>& aFamStringMap )
{
 std::string famLang;
 std::string fam;
 
 int langIdx = 0;
 do
 {
 famLang = getFcString( aPat, FC_FAMILYLANG, langIdx );
 
 if( famLang.empty() && langIdx != 0 )
 break;
 else
 {
 fam = getFcString( aPat, FC_FAMILY, langIdx );
 aFamStringMap.insert_or_assign( famLang, fam );
 }
 } while( langIdx++ < std::numeric_limits<
 int8_t>::max() ); //arbitrary to avoid getting stuck for any reason
}
 
 
std::string FONTCONFIG::getFamilyStringByLang( FONTCONFIG_PAT& aPat, const wxString& aDesiredLang )
{
 std::unordered_map<std::string, std::string> famStrings;
 getAllFamilyStrings( aPat, famStrings );
 
 if( famStrings.empty() )
 return "";
 
 for( auto const& [key, val] : famStrings )
 {
 if( isLanguageMatch( aDesiredLang, From_UTF8( key.c_str() ) ) )
 {
 return val;
 }
 }
 
 // fall back to the first and maybe only available name
 // most fonts by review don't even bother declaring more than one font family name
 // and they don't even bother declare the language tag either, they just leave it blank
 return famStrings.begin()->second;
}
 
 
FONTCONFIG::FF_RESULT FONTCONFIG::FindFont( const wxString &aFontName, wxString &aFontFile,
 int& aFaceIndex, bool aBold, bool aItalic )
{
 FF_RESULT retval = FF_RESULT::FF_ERROR;
 wxString qualifiedFontName = aFontName;
 
 wxScopedCharBuffer const fcBuffer = qualifiedFontName.ToUTF8();
 
 FcPattern* pat = FcPatternCreate();
 
 if( aBold )
 FcPatternAddString( pat, FC_STYLE, (const FcChar8*) "Bold" );
 
 if( aItalic )
 FcPatternAddString( pat, FC_STYLE, (const FcChar8*) "Italic" );
 
 FcPatternAddString( pat, FC_FAMILY, (FcChar8*) fcBuffer.data() );
 
 FcConfigSubstitute( nullptr, pat, FcMatchPattern );
 FcDefaultSubstitute( pat );
 
 FcResult r = FcResultNoMatch;
 FcPattern* font = FcFontMatch( nullptr, pat, &r );
 
 wxString fontName;
 
 if( font )
 {
 FcChar8* file = nullptr;
 
 if( FcPatternGetString( font, FC_FILE, 0, &file ) == FcResultMatch )
 {
 aFontFile = wxString::FromUTF8( (char*) file );
 aFaceIndex = 0;
 
 wxString styleStr;
 FcChar8* family = nullptr;
 FcChar8* style = nullptr;
 
 retval = FF_RESULT::FF_SUBSTITUTE;
 
 std::unordered_map<std::string, std::string> famStrings;
 FONTCONFIG_PAT patHolder{ font };
 
 getAllFamilyStrings( patHolder, famStrings );
 
 if( FcPatternGetString( font, FC_FAMILY, 0, &family ) == FcResultMatch )
 {
 FcPatternGetInteger( font, FC_INDEX, 0, &aFaceIndex );
 
 fontName = wxString::FromUTF8( (char*) family );
 
 if( FcPatternGetString( font, FC_STYLE, 0, &style ) == FcResultMatch )
 {
 styleStr = wxString::FromUTF8( (char*) style );
 
 if( !styleStr.IsEmpty() )
 {
 styleStr.Replace( wxS( " " ), wxS( ":" ) );
 fontName += ":" + styleStr;
 }
 }
 
 bool has_bold = false;
 bool has_ital = false;
 wxString lower_style = styleStr.Lower();
 
 if( lower_style.Contains( wxS( "bold" ) )
 || lower_style.Contains( wxS( "black" ) )
 || lower_style.Contains( wxS( "thick" ) )
 || lower_style.Contains( wxS( "dark" ) ) )
 {
 has_bold = true;
 }
 
 if( lower_style.Contains( wxS( "italic" ) )
 || lower_style.Contains( wxS( "oblique" ) )
 || lower_style.Contains( wxS( "slant" ) ) )
 {
 has_ital = true;
 }
 
 for( auto const& [key, val] : famStrings )
 {
 wxString searchFont;
 searchFont = wxString::FromUTF8( (char*) val.data() );
 
 if( searchFont.Lower().StartsWith( aFontName.Lower() ) )
 {
 if( ( aBold && !has_bold ) && ( aItalic && !has_ital ) )
 retval = FF_RESULT::FF_MISSING_BOLD_ITAL;
 else if( aBold && !has_bold )
 retval = FF_RESULT::FF_MISSING_BOLD;
 else if( aItalic && !has_ital )
 retval = FF_RESULT::FF_MISSING_ITAL;
 else if( ( aBold != has_bold ) || ( aItalic != has_ital ) )
 retval = FF_RESULT::FF_SUBSTITUTE;
 else
 retval = FF_RESULT::FF_OK;
 
 break;
 }
 }
 }
 }
 
 FcPatternDestroy( font );
 }
 
 if( retval == FF_RESULT::FF_ERROR )
 wxLogWarning( _( "Error loading font '%s'." ), qualifiedFontName );
 else if( retval == FF_RESULT::FF_SUBSTITUTE )
 wxLogWarning( _( "Font '%s' not found; substituting '%s'." ), qualifiedFontName, fontName );
 
 FcPatternDestroy( pat );
 return retval;
}
 
 
void FONTCONFIG::ListFonts( std::vector<std::string>& aFonts, const std::string& aDesiredLang )
{
 // be sure to cache bust if the language changed
 if( m_fontInfoCache.empty() || m_fontCacheLastLang != aDesiredLang )
 {
 FcPattern* pat = FcPatternCreate();
 FcObjectSet* os = FcObjectSetBuild( FC_FAMILY, FC_FAMILYLANG, FC_STYLE, FC_LANG, FC_FILE,
 FC_OUTLINE, nullptr );
 FcFontSet* fs = FcFontList( nullptr, pat, os );
 
 for( int i = 0; fs && i < fs->nfont; ++i )
 {
 FcPattern* font = fs->fonts[i];
 FcChar8* file;
 FcChar8* style;
 FcLangSet* langSet;
 FcBool outline;
 
 if( FcPatternGetString( font, FC_FILE, 0, &file ) == FcResultMatch
 && FcPatternGetString( font, FC_STYLE, 0, &style ) == FcResultMatch
 && FcPatternGetLangSet( font, FC_LANG, 0, &langSet ) == FcResultMatch
 && FcPatternGetBool( font, FC_OUTLINE, 0, &outline ) == FcResultMatch )
 {
 if( !outline )
 continue;
 
 FONTCONFIG_PAT patHolder{ font };
 std::string theFamily =
 getFamilyStringByLang( patHolder, From_UTF8( aDesiredLang.c_str() ) );
 
#ifdef __WXMAC__
 // On Mac (at least) some of the font names are in their own language. If
 // the OS doesn't support this language then we get a bunch of garbage names
 // in the font menu.
 //
 // GTK, on the other hand, doesn't appear to support wxLocale::IsAvailable(),
 // so we can't run these checks.
 
 FcStrSet* langStrSet = FcLangSetGetLangs( langSet );
 FcStrList* langStrList = FcStrListCreate( langStrSet );
 FcChar8* langStr = FcStrListNext( langStrList );
 bool langSupported = false;
 
 if( !langStr )
 {
 // Symbol fonts (Wingdings, etc.) have no language
 langSupported = true;
 }
 else while( langStr )
 {
 wxString langWxStr( reinterpret_cast<char *>( langStr ) );
 const wxLanguageInfo* langInfo = wxLocale::FindLanguageInfo( langWxStr );
 
 if( langInfo && wxLocale::IsAvailable( langInfo->Language ) )
 {
 langSupported = true;
 break;
 }
 else
 {
 wxLogTrace( traceFonts, wxS( "Font '%s' language '%s' not supported by OS." ),
 theFamily, langWxStr );
 }
 
 langStr = FcStrListNext( langStrList );
 }
 
 FcStrListDone( langStrList );
 FcStrSetDestroy( langStrSet );
 
 if( !langSupported )
 continue;
#endif
 
 std::string theFile( reinterpret_cast<char *>( file ) );
 std::string theStyle( reinterpret_cast<char *>( style ) );
 FONTINFO fontInfo( theFile, theStyle, theFamily );
 
 if( theFamily.length() > 0 && theFamily.front() == '.' )
 continue;
 
 std::map<std::string, FONTINFO>::iterator it = m_fontInfoCache.find( theFamily );
 
 if( it == m_fontInfoCache.end() )
 m_fontInfoCache.emplace( theFamily, fontInfo );
 else
 it->second.Children().push_back( fontInfo );
 }
 }
 
 if( fs )
 FcFontSetDestroy( fs );
 
 m_fontCacheLastLang = aDesiredLang;
 }
 
 for( const std::pair<const std::string, FONTINFO>& entry : m_fontInfoCache )
 aFonts.push_back( entry.second.Family() );
}