]> git.saurik.com Git - wxWidgets.git/blobdiff - src/common/fontmap.cpp
really fixed wxConfig bug
[wxWidgets.git] / src / common / fontmap.cpp
index 081c2c5215d08b878e4d180639b888a3c6980042..c63b9af1c49958d66e313ea57b3fafeaaf829332 100644 (file)
 #endif // PCH
 
 #include "wx/fontmap.h"
-#include "wx/config.h"
-#include "wx/choicdlg.h"
+
+#if wxUSE_CONFIG
+    #include "wx/config.h"
+    #include "wx/memconf.h"
+#endif
+
+#if wxUSE_GUI
+    #include "wx/fontutil.h"
+    #include "wx/msgdlg.h"
+    #include "wx/fontdlg.h"
+    #include "wx/choicdlg.h"
+#endif // wxUSE_GUI
+
+#include "wx/encconv.h"
 
 // ----------------------------------------------------------------------------
 // constants
 // ----------------------------------------------------------------------------
 
 // the config paths we use
-static const char* FONTMAPPER_ROOT_PATH = _T("FontMapper");
-static const char* FONTMAPPER_CHARSET_PATH = _T("Charsets");
-static const char* FONTMAPPER_CHARSET_ALIAS_PATH = _T("Aliases");
+static const wxChar* FONTMAPPER_ROOT_PATH = wxT("/wxWindows/FontMapper");
+static const wxChar* FONTMAPPER_CHARSET_PATH = wxT("Charsets");
+static const wxChar* FONTMAPPER_CHARSET_ALIAS_PATH = wxT("Aliases");
+
+// we only ask questions in GUI mode
+#if wxUSE_GUI
+    static const wxChar* FONTMAPPER_FONT_FROM_ENCODING_PATH = wxT("Encodings");
+    static const wxChar* FONTMAPPER_FONT_DONT_ASK = wxT("none");
+#endif // wxUSE_GUI
+
+// encodings supported by GetEncodingDescription
+static wxFontEncoding gs_encodings[] =
+{
+    wxFONTENCODING_ISO8859_1,
+    wxFONTENCODING_ISO8859_2,
+    wxFONTENCODING_ISO8859_3,
+    wxFONTENCODING_ISO8859_4,
+    wxFONTENCODING_ISO8859_5,
+    wxFONTENCODING_ISO8859_6,
+    wxFONTENCODING_ISO8859_7,
+    wxFONTENCODING_ISO8859_8,
+    wxFONTENCODING_ISO8859_9,
+    wxFONTENCODING_ISO8859_10,
+    wxFONTENCODING_ISO8859_11,
+    wxFONTENCODING_ISO8859_12,
+    wxFONTENCODING_ISO8859_13,
+    wxFONTENCODING_ISO8859_14,
+    wxFONTENCODING_ISO8859_15,
+    wxFONTENCODING_KOI8,
+    wxFONTENCODING_CP1250,
+    wxFONTENCODING_CP1251,
+    wxFONTENCODING_CP1252,
+    wxFONTENCODING_CP1253,
+    wxFONTENCODING_CP1254,
+    wxFONTENCODING_CP1255,
+    wxFONTENCODING_CP1256,
+    wxFONTENCODING_CP1257,
+    wxFONTENCODING_CP437,
+    wxFONTENCODING_UTF7,
+    wxFONTENCODING_UTF8,
+};
+
+// the descriptions for them
+static const wxChar* gs_encodingDescs[] =
+{
+    wxTRANSLATE( "Western European (ISO-8859-1)" ),
+    wxTRANSLATE( "Central European (ISO-8859-2)" ),
+    wxTRANSLATE( "Esperanto (ISO-8859-3)" ),
+    wxTRANSLATE( "Baltic (old) (ISO-8859-4)" ),
+    wxTRANSLATE( "Cyrillic (ISO-8859-5)" ),
+    wxTRANSLATE( "Arabic (ISO-8859-6)" ),
+    wxTRANSLATE( "Greek (ISO-8859-7)" ),
+    wxTRANSLATE( "Hebrew (ISO-8859-8)" ),
+    wxTRANSLATE( "Turkish (ISO-8859-9)" ),
+    wxTRANSLATE( "Nordic (ISO-8859-10)" ),
+    wxTRANSLATE( "Thai (ISO-8859-11)" ),
+    wxTRANSLATE( "Indian (ISO-8859-12)" ),
+    wxTRANSLATE( "Baltic (ISO-8859-13)" ),
+    wxTRANSLATE( "Celtic (ISO-8859-14)" ),
+    wxTRANSLATE( "Western European with Euro (ISO-8859-15)" ),
+    wxTRANSLATE( "KOI8-R" ),
+    wxTRANSLATE( "Windows Central European (CP 1250)" ),
+    wxTRANSLATE( "Windows Cyrillic (CP 1251)" ),
+    wxTRANSLATE( "Windows Western European (CP 1252)" ),
+    wxTRANSLATE( "Windows Greek (CP 1253)" ),
+    wxTRANSLATE( "Windows Turkish (CP 1254)" ),
+    wxTRANSLATE( "Windows Hebrew (CP 1255)" ),
+    wxTRANSLATE( "Windows Arabic (CP 1256)" ),
+    wxTRANSLATE( "Windows Baltic (CP 1257)" ),
+    wxTRANSLATE( "Windows/DOS OEM (CP 437)" ),
+    wxTRANSLATE( "Unicode 7 bit (UTF-7)" ),
+    wxTRANSLATE( "Unicode 8 bit (UTF-8)" ),
+};
+
+// and the internal names
+static const wxChar* gs_encodingNames[] =
+{
+    wxT( "iso8859-1" ),
+    wxT( "iso8859-2" ),
+    wxT( "iso8859-3" ),
+    wxT( "iso8859-4" ),
+    wxT( "iso8859-5" ),
+    wxT( "iso8859-6" ),
+    wxT( "iso8859-7" ),
+    wxT( "iso8859-8" ),
+    wxT( "iso8859-9" ),
+    wxT( "iso8859-10" ),
+    wxT( "iso8859-11" ),
+    wxT( "iso8859-12" ),
+    wxT( "iso8859-13" ),
+    wxT( "iso8859-14" ),
+    wxT( "iso8859-15" ),
+    wxT( "koi8-r" ),
+    wxT( "windows-1250" ),
+    wxT( "windows-1251" ),
+    wxT( "windows-1252" ),
+    wxT( "windows-1253" ),
+    wxT( "windows-1254" ),
+    wxT( "windows-1255" ),
+    wxT( "windows-1256" ),
+    wxT( "windows-1257" ),
+    wxT( "windows-437" ),
+    wxT( "utf7" ),
+    wxT( "utf8" ),
+};
+
+// ----------------------------------------------------------------------------
+// global data
+// ----------------------------------------------------------------------------
+
+// private object
+static wxFontMapper gs_fontMapper;
+
+// and public pointer
+wxFontMapper * wxTheFontMapper = &gs_fontMapper;
+
+// ----------------------------------------------------------------------------
+// private classes
+// ----------------------------------------------------------------------------
+
+// change the config path during the lifetime of this object
+class wxFontMapperPathChanger
+{
+public:
+    wxFontMapperPathChanger(wxFontMapper *fontMapper, const wxString& path)
+    {
+        m_fontMapper = fontMapper;
+        m_ok = m_fontMapper->ChangePath(path, &m_pathOld);
+    }
+
+    bool IsOk() const { return m_ok; }
+
+    ~wxFontMapperPathChanger()
+    {
+        if ( IsOk() )
+            m_fontMapper->RestorePath(m_pathOld);
+    }
+
+private:
+    wxFontMapper *m_fontMapper;
+    bool          m_ok;
+    wxString      m_pathOld;
+};
 
 // ============================================================================
 // implementation
@@ -57,8 +209,13 @@ static const char* FONTMAPPER_CHARSET_ALIAS_PATH = _T("Aliases");
 
 wxFontMapper::wxFontMapper()
 {
+#if wxUSE_CONFIG
     m_config = NULL;
+#endif // wxUSE_CONFIG
+
+#if wxUSE_GUI
     m_windowParent = NULL;
+#endif // wxUSE_GUI
 }
 
 wxFontMapper::~wxFontMapper()
@@ -69,6 +226,8 @@ wxFontMapper::~wxFontMapper()
 // customisation
 // ----------------------------------------------------------------------------
 
+#if wxUSE_CONFIG
+
 /* static */ const wxChar *wxFontMapper::GetDefaultConfigPath()
 {
     return FONTMAPPER_ROOT_PATH;
@@ -77,13 +236,11 @@ wxFontMapper::~wxFontMapper()
 void wxFontMapper::SetConfigPath(const wxString& prefix)
 {
     wxCHECK_RET( !prefix.IsEmpty() && prefix[0] == wxCONFIG_PATH_SEPARATOR,
-                 _T("an absolute path should be given to "
-                     "wxFontMapper::SetConfigPath()") );
+                 wxT("an absolute path should be given to wxFontMapper::SetConfigPath()") );
 
     m_configRootPath = prefix;
 }
 
-
 // ----------------------------------------------------------------------------
 // get config object and path for it
 // ----------------------------------------------------------------------------
@@ -93,7 +250,18 @@ wxConfigBase *wxFontMapper::GetConfig()
     if ( !m_config )
     {
         // try the default
-        m_config = wxConfig::Get();
+        m_config = wxConfig::Get(FALSE /*don't create on demand*/ );
+
+        if ( !m_config )
+        {
+            // we still want to have a config object because otherwise we would
+            // keep asking the user the same questions in the interactive mode,
+            // so create a dummy config which won't write to any files/registry
+            // but will allow us to remember the results of the questions at
+            // least during this run
+            m_config = new wxMemoryConfig;
+            wxConfig::Set(m_config);
+        }
     }
 
     return m_config;
@@ -109,9 +277,11 @@ const wxString& wxFontMapper::GetConfigPath()
 
     return m_configRootPath;
 }
+#endif
 
 bool wxFontMapper::ChangePath(const wxString& pathNew, wxString *pathOld)
 {
+#if wxUSE_CONFIG
     wxConfigBase *config = GetConfig();
     if ( !config )
         return FALSE;
@@ -125,24 +295,84 @@ bool wxFontMapper::ChangePath(const wxString& pathNew, wxString *pathOld)
     }
 
     wxASSERT_MSG( !pathNew || (pathNew[0] != wxCONFIG_PATH_SEPARATOR),
-                  _T("should be a relative path") );
+                  wxT("should be a relative path") );
 
     path += pathNew;
 
     config->SetPath(path);
 
     return TRUE;
+#else
+    return FALSE;
+#endif
 }
 
 void wxFontMapper::RestorePath(const wxString& pathOld)
 {
+#if wxUSE_CONFIG
     GetConfig()->SetPath(pathOld);
+#else
+#endif
 }
 
 // ----------------------------------------------------------------------------
 // charset/encoding correspondence
 // ----------------------------------------------------------------------------
 
+/* static */
+wxString wxFontMapper::GetEncodingDescription(wxFontEncoding encoding)
+{
+    if ( encoding == wxFONTENCODING_DEFAULT )
+    {
+        return _("Default encoding");
+    }
+
+    size_t count = WXSIZEOF(gs_encodingDescs);
+
+    wxASSERT_MSG( count == WXSIZEOF(gs_encodings),
+                  wxT("inconsitency detected - forgot to update one of the arrays?") );
+
+    for ( size_t i = 0; i < count; i++ )
+    {
+        if ( gs_encodings[i] == encoding )
+        {
+            return wxGetTranslation(gs_encodingDescs[i]);
+        }
+    }
+
+    wxString str;
+    str.Printf(_("Unknown encoding (%d)"), encoding);
+
+    return str;
+}
+
+/* static */
+wxString wxFontMapper::GetEncodingName(wxFontEncoding encoding)
+{
+    if ( encoding == wxFONTENCODING_DEFAULT )
+    {
+        return _("default");
+    }
+
+    size_t count = WXSIZEOF(gs_encodingNames);
+
+    wxASSERT_MSG( count == WXSIZEOF(gs_encodings),
+                  wxT("inconsistency detected - forgot to update one of the arrays?") );
+
+    for ( size_t i = 0; i < count; i++ )
+    {
+        if ( gs_encodings[i] == encoding )
+        {
+            return wxGetTranslation(gs_encodingNames[i]);
+        }
+    }
+
+    wxString str;
+    str.Printf(_("unknown-%d"), encoding);
+
+    return str;
+}
+
 wxFontEncoding wxFontMapper::CharsetToEncoding(const wxString& charset,
                                                bool interactive)
 {
@@ -151,6 +381,7 @@ wxFontEncoding wxFontMapper::CharsetToEncoding(const wxString& charset,
     // we're going to modify it, make a copy
     wxString cs = charset;
 
+#if wxUSE_CONFIG
     // first try the user-defined settings
     wxString pathOld;
     if ( ChangePath(FONTMAPPER_CHARSET_PATH, &pathOld) )
@@ -167,8 +398,8 @@ wxFontEncoding wxFontMapper::CharsetToEncoding(const wxString& charset,
             }
             else
             {
-                wxLogDebug(_T("corrupted config data - invalid encoding %ld "
-                              "for charset '%s'"), value, charset.c_str());
+                wxLogDebug(wxT("corrupted config data: invalid encoding %ld for charset '%s' ignored"),
+                           value, charset.c_str());
             }
         }
 
@@ -187,50 +418,105 @@ wxFontEncoding wxFontMapper::CharsetToEncoding(const wxString& charset,
 
         RestorePath(pathOld);
     }
+#endif
 
-    // if didn't find it there, try to reckognise it ourselves
+    // if didn't find it there, try to recognize it ourselves
     if ( encoding == wxFONTENCODING_SYSTEM )
     {
+        // trim any spaces
+        cs.Trim(TRUE);
+        cs.Trim(FALSE);
+
+        // discard the optional quotes
+        if ( !!cs )
+        {
+            if ( cs[0u] == _T('"') && cs.Last() == _T('"') )
+            {
+                cs = wxString(cs.c_str(), cs.length() - 1);
+            }
+        }
+
         cs.MakeUpper();
 
-        if ( !cs || cs == _T("US-ASCII") )
+        if ( !cs || cs == wxT("US-ASCII") )
+        {
             encoding = wxFONTENCODING_DEFAULT;
-        else if ( cs == _T("KOI8-R") || cs == _T("KOI8-U") )
+        }
+        else if ( cs == wxT("UTF-7") )
+        {
+            encoding = wxFONTENCODING_UTF7;
+        }
+        else if ( cs == wxT("UTF-8") )
+        {
+            encoding = wxFONTENCODING_UTF8;
+        }
+        else if ( cs == wxT("KOI8-R") ||
+                  cs == wxT("KOI8-U") ||
+                  cs == wxT("KOI8-RU") )
+        {
+            // although koi8-ru is not strictly speaking the same as koi8-r,
+            // they are similar enough to make mapping it to koi8 better than
+            // not reckognizing it at all
             encoding = wxFONTENCODING_KOI8;
-        else if ( cs.Left(3) == _T("ISO") )
+        }
+        else if ( cs.Left(3) == wxT("ISO") )
         {
             // the dash is optional (or, to be exact, it is not, but
             // several brokenmails "forget" it)
             const wxChar *p = cs.c_str() + 3;
-            if ( *p == _T('-') )
+            if ( *p == wxT('-') )
                 p++;
 
             unsigned int value;
-            if ( wxSscanf(p, _T("8859-%u"), &value) == 1 )
+            if ( wxSscanf(p, wxT("8859-%u"), &value) == 1 )
             {
-                if ( value < wxFONTENCODING_ISO8859_MAX -
-                             wxFONTENCODING_ISO8859_1 )
+                // make it 0 based and check that it is strictly positive in
+                // the process (no such thing as iso8859-0 encoding)
+                if ( (value-- > 0) &&
+                     (value < wxFONTENCODING_ISO8859_MAX -
+                              wxFONTENCODING_ISO8859_1) )
                 {
                     // it's a valid ISO8859 encoding
-                    value += wxFONTENCODING_ISO8859_1 - 1;
+                    value += wxFONTENCODING_ISO8859_1;
                     encoding = (wxFontEncoding)value;
                 }
             }
         }
-        else if ( cs.Left(8) == _T("WINDOWS-") )
+        else // check for Windows charsets
         {
-            int value;
-            if ( wxSscanf(cs.c_str() + 8, "%u", &value) == 1 )
+            size_t len;
+            if ( cs.Left(7) == wxT("WINDOWS") )
+            {
+                len = 7;
+            }
+            else if ( cs.Left(2) == wxT("CP") )
+            {
+                len = 2;
+            }
+            else // not a Windows encoding
+            {
+                len = 0;
+            }
+
+            if ( len )
             {
-                if ( value >= 1250 )
+                const wxChar *p = cs.c_str() + len;
+                if ( *p == wxT('-') )
+                    p++;
+
+                int value;
+                if ( wxSscanf(p, wxT("%u"), &value) == 1 )
                 {
-                    value -= 1250;
-                    if ( value < wxFONTENCODING_CP12_MAX -
-                                 wxFONTENCODING_CP1250 - 1 )
+                    if ( value >= 1250 )
                     {
-                        // a valid Windows code page
-                        value += wxFONTENCODING_CP1250;
-                        encoding = (wxFontEncoding)value;
+                        value -= 1250;
+                        if ( value < wxFONTENCODING_CP12_MAX -
+                                     wxFONTENCODING_CP1250 )
+                        {
+                            // a valid Windows code page
+                            value += wxFONTENCODING_CP1250;
+                            encoding = (wxFontEncoding)value;
+                        }
                     }
                 }
             }
@@ -238,6 +524,7 @@ wxFontEncoding wxFontMapper::CharsetToEncoding(const wxString& charset,
         //else: unknown
     }
 
+#if wxUSE_GUI
     // if still no luck, ask the user - unless disabled
     if ( (encoding == wxFONTENCODING_SYSTEM) && interactive )
     {
@@ -250,78 +537,19 @@ wxFontEncoding wxFontMapper::CharsetToEncoding(const wxString& charset,
 
         // the message
         wxString msg;
-        msg.Printf(_("The charset '%s' is unknown. You may select another "
-                     "charset to replace it with or choose [Cancel] if it "
-                     "cannot be replaced"), charset.c_str());
+        msg.Printf(_("The charset '%s' is unknown. You may select\nanother charset to replace it with or choose\n[Cancel] if it cannot be replaced"), charset.c_str());
 
         // the list of choices
-        static wxFontEncoding encodings[] =
-        {
-            wxFONTENCODING_ISO8859_1,
-            wxFONTENCODING_ISO8859_2,
-            wxFONTENCODING_ISO8859_3,
-            wxFONTENCODING_ISO8859_4,
-            wxFONTENCODING_ISO8859_5,
-            wxFONTENCODING_ISO8859_6,
-            wxFONTENCODING_ISO8859_7,
-            wxFONTENCODING_ISO8859_8,
-            wxFONTENCODING_ISO8859_9,
-            wxFONTENCODING_ISO8859_10,
-            wxFONTENCODING_ISO8859_11,
-            wxFONTENCODING_ISO8859_12,
-            wxFONTENCODING_ISO8859_13,
-            wxFONTENCODING_ISO8859_14,
-            wxFONTENCODING_ISO8859_15,
-            wxFONTENCODING_KOI8,
-            wxFONTENCODING_CP1250,
-            wxFONTENCODING_CP1251,
-            wxFONTENCODING_CP1252,
-            wxFONTENCODING_CP1253,
-            wxFONTENCODING_CP1254,
-            wxFONTENCODING_CP1255,
-            wxFONTENCODING_CP1256,
-            wxFONTENCODING_CP1257,
-        };
-
-        static const wxChar* encodingNames[] =
-        {
-            "West European (ISO-8859-1/Latin 1)",
-            "Central European (ISO-8859-2/Latin 2)",
-            "Esperanto (ISO-8859-3)",
-            "Baltic (ISO-8859-4)",
-            "Cyrillic (Latin 5)",
-            "Arabic (ISO-8859-6)"
-            "Greek (ISO-8859-7)",
-            "Hebrew (ISO-8859-8)",
-            "Turkish (ISO-8859-9)",
-            "Baltic II (ISO-8859-10)",
-            "Thai (ISO-8859-11)",
-            "ISO-8859-12",
-            "ISO-8859-13",
-            "ISO-8859-14",
-            "West European new (ISO-8859-15/Latin 0)",
-            "KOI8-R",
-            "Windows Latin 2 (CP 1250)",
-            "Windows Cyrillic (CP 1251)",
-            "Windows Latin 1 (CP 1252)",
-            "Windows Greek (CP 1253)",
-            "Windows Turkish (CP 1254)",
-            "Windows Hebrew (CP 1255)",
-            "Windows Arabic (CP 1256)",
-            "Windows Baltic (CP 1257)",
-        };
-
-        size_t count = WXSIZEOF(encodingNames);
-
-        wxASSERT_MSG( count == WXSIZEOF(encodings),
-                      _T("inconsitency detected - forgot to update one of "
-                         "the arrays?") );
+        size_t count = WXSIZEOF(gs_encodingDescs);
+
+        wxASSERT_MSG( count == WXSIZEOF(gs_encodings),
+                      wxT("inconsitency detected - forgot to update one of the arrays?") );
 
         wxString *encodingNamesTranslated = new wxString[count];
 
-        for ( size_t n = 0; n < count; n++ )
+        for ( size_t i = 0; i < count; i++ )
         {
-            encodingNamesTranslated[n] = wxGetTranslation(encodingNames[n]);
+            encodingNamesTranslated[i] = wxGetTranslation(gs_encodingDescs[i]);
         }
 
         // the parent window
@@ -339,11 +567,271 @@ wxFontEncoding wxFontMapper::CharsetToEncoding(const wxString& charset,
 
         if ( n != -1 )
         {
-            encoding = encodings[n];
+            encoding = gs_encodings[n];
+
+#if wxUSE_CONFIG
+        // save the result in the config now
+            if ( ChangePath(FONTMAPPER_CHARSET_PATH, &pathOld) )
+            {
+                wxConfigBase *config = GetConfig();
+
+                // remember the alt encoding for this charset
+                if ( !config->Write(charset, (long)encoding) )
+                {
+                    wxLogError(_("Failed to remember the encoding for the charset '%s'."), charset.c_str());
+                }
+
+                RestorePath(pathOld);
+            }
+#endif // wxUSE_CONFIG
         }
         //else: cancelled
     }
+#endif // wxUSE_GUI
 
     return encoding;
 }
 
+// ----------------------------------------------------------------------------
+// support for unknown encodings: we maintain a map between the
+// (platform-specific) strings identifying them and our wxFontEncodings they
+// correspond to which is used by GetFontForEncoding() function
+// ----------------------------------------------------------------------------
+
+#if wxUSE_GUI
+
+bool wxFontMapper::TestAltEncoding(const wxString& configEntry,
+                                   wxFontEncoding encReplacement,
+                                   wxNativeEncodingInfo *info)
+{
+    if ( wxGetNativeFontEncoding(encReplacement, info) &&
+         wxTestFontEncoding(*info) )
+    {
+#if wxUSE_CONFIG
+        // remember the mapping in the config
+        wxFontMapperPathChanger path(this, FONTMAPPER_FONT_FROM_ENCODING_PATH);
+
+        if ( path.IsOk() )
+        {
+            GetConfig()->Write(configEntry, info->ToString());
+        }
+#endif // wxUSE_CONFIG
+        return TRUE;
+    }
+
+    return FALSE;
+}
+
+#if wxUSE_GUI
+class ReentrancyBlocker
+{
+public:
+    ReentrancyBlocker(bool& b) : m_b(b) { m_b = TRUE; }
+    ~ReentrancyBlocker() { m_b = FALSE; }
+
+private:
+    bool& m_b;
+};
+#endif
+
+bool wxFontMapper::GetAltForEncoding(wxFontEncoding encoding,
+                                     wxNativeEncodingInfo *info,
+                                     const wxString& facename,
+                                     bool interactive)
+{
+#if wxUSE_GUI
+    // we need a flag to prevent infinite recursion which happens, for
+    // example, when GetAltForEncoding() is called from an OnPaint() handler:
+    // in this case, wxYield() which is called from wxMessageBox() we use here
+    // will lead to another call of OnPaint() and hence to another call of
+    // GetAltForEncoding() - and it is impossible to catch this from the user
+    // code because we are called from wxFont ctor implicitly.
+
+    // assume we're always called from the main thread, so that it is safe to
+    // use a static var
+    static bool s_inGetAltForEncoding = FALSE;
+
+    if ( interactive && s_inGetAltForEncoding )
+        return FALSE;
+
+    ReentrancyBlocker blocker(s_inGetAltForEncoding);
+#endif // wxUSE_GUI
+
+    wxCHECK_MSG( info, FALSE, wxT("bad pointer in GetAltForEncoding") );
+
+    info->facename = facename;
+
+    if ( encoding == wxFONTENCODING_DEFAULT )
+    {
+        encoding = wxFont::GetDefaultEncoding();
+    }
+
+    // if we failed to load the system default encoding, something is really
+    // wrong and we'd better stop now - otherwise we will go into endless
+    // recursion trying to create the font in the msg box with the error
+    // message
+    if ( encoding == wxFONTENCODING_SYSTEM )
+    {
+        wxFatalError(_("can't load any font, aborting"));
+
+        // wxFatalError doesn't return
+    }
+
+    wxString configEntry, encName = GetEncodingName(encoding);
+    if ( !!facename )
+    {
+        configEntry = facename + _T("_");
+    }
+    configEntry += encName;
+
+#if wxUSE_CONFIG
+    // do we have a font spec for this encoding?
+    wxString pathOld;
+    if ( ChangePath(FONTMAPPER_FONT_FROM_ENCODING_PATH, &pathOld) )
+    {
+        wxConfigBase *config = GetConfig();
+
+        wxString fontinfo = config->Read(configEntry);
+
+        RestorePath(pathOld);
+
+        // this special value means that we don't know of fonts for this
+        // encoding but, moreover, have already asked the user as well and he
+        // didn't specify any font neither
+        if ( fontinfo == FONTMAPPER_FONT_DONT_ASK )
+        {
+            interactive = FALSE;
+        }
+        else // use the info entered the last time
+        {
+            if ( !!fontinfo && !!facename )
+            {
+                // we tried to find a match with facename - now try without it
+                fontinfo = config->Read(encName);
+            }
+
+            if ( !!fontinfo )
+            {
+                if ( info->FromString(fontinfo) )
+                {
+                    if ( wxTestFontEncoding(*info) )
+                    {
+                        // ok, got something
+                        return TRUE;
+                    }
+                    //else: no such fonts, look for something else
+                    //      (should we erase the outdated value?)
+                }
+                else
+                {
+                    wxLogDebug(wxT("corrupted config data: string '%s' is not a valid font encoding info"),
+                               fontinfo.c_str());
+                }
+            }
+            //else: there is no information in config about this encoding
+        }
+    }
+#endif // wxUSE_CONFIG
+
+    // ask the user
+    if ( interactive )
+    {
+        wxString title(m_titleDialog);
+        if ( !title )
+            title << wxTheApp->GetAppName() << _(": unknown encoding");
+
+        // the message
+        wxString msg;
+        msg.Printf(_("No font for displaying text in encoding '%s' found.\nWould you like to select a font to be used for this encoding\n(otherwise the text in this encoding will not be shown correctly)?"),
+                     GetEncodingDescription(encoding).c_str());
+
+        wxWindow *parent = m_windowParent;
+        if ( !parent )
+            parent = wxTheApp->GetTopWindow();
+
+        if ( wxMessageBox(msg, title,
+                          wxICON_QUESTION | wxYES_NO, parent) == wxYES )
+        {
+            wxFontData data;
+            data.SetEncoding(encoding);
+            data.EncodingInfo() = *info;
+            wxFontDialog dialog(parent, &data);
+            if ( dialog.ShowModal() == wxID_OK )
+            {
+                wxFontData retData = dialog.GetFontData();
+                wxFont font = retData.GetChosenFont();
+
+                *info = retData.EncodingInfo();
+                info -> encoding = retData.GetEncoding();
+
+#if wxUSE_CONFIG
+                // remember this in the config
+                if ( ChangePath(FONTMAPPER_FONT_FROM_ENCODING_PATH, &pathOld) )
+                {
+                    GetConfig()->Write(configEntry, info->ToString());
+
+                    RestorePath(pathOld);
+                }
+#endif // wxUSE_CONFIG
+
+                return TRUE;
+            }
+            //else: the user canceled the font selection dialog
+        }
+        else
+        {
+            // the user doesn't want to select a font for this encoding,
+            // remember it to avoid asking the same question again later
+#if wxUSE_CONFIG
+            if ( ChangePath(FONTMAPPER_FONT_FROM_ENCODING_PATH, &pathOld) )
+            {
+                GetConfig()->Write(configEntry, FONTMAPPER_FONT_DONT_ASK);
+
+                RestorePath(pathOld);
+            }
+#endif // wxUSE_CONFIG
+        }
+    }
+    //else: we're in non-interactive mode
+
+    // now try the default mappings:
+    wxFontEncodingArray equiv = wxEncodingConverter::GetAllEquivalents(encoding);
+    size_t count = equiv.GetCount();
+    if ( count )
+    {
+        for ( size_t i = (equiv[0] == encoding) ? 1 : 0; i < count; i++ )
+        {
+            if ( TestAltEncoding(configEntry, equiv[i], info) )
+                return TRUE;
+        }
+    }
+
+    return FALSE;
+}
+
+bool wxFontMapper::GetAltForEncoding(wxFontEncoding encoding,
+                                     wxFontEncoding *alt_encoding,
+                                     const wxString& facename,
+                                     bool interactive)
+{
+    wxNativeEncodingInfo info;
+    bool r = GetAltForEncoding(encoding, &info, facename, interactive);
+    *alt_encoding = info.encoding;
+    return r;
+}
+
+bool wxFontMapper::IsEncodingAvailable(wxFontEncoding encoding,
+                                       const wxString& facename)
+{
+    wxNativeEncodingInfo info;
+
+    if (wxGetNativeFontEncoding(encoding, &info))
+    {
+        info.facename = facename;
+        return wxTestFontEncoding(info);
+    }
+
+    return FALSE;
+}
+
+#endif // wxUSE_GUI