src/common/fontmap.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        common/fontmap.cpp
   3 // Purpose:     wxFontMapper class
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     04.11.99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Vadim Zeitlin
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21     #pragma implementation "fontmap.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/app.h"
  33     #include "wx/log.h"
  34     #include "wx/intl.h"
  35 #endif // PCH
  36
  37 #include "wx/fontmap.h"
  38
  39 #if wxUSE_CONFIG
  40     #include "wx/config.h"
  41     #include "wx/memconf.h"
  42 #endif
  43
  44 #if wxUSE_GUI
  45     #include "wx/fontutil.h"
  46     #include "wx/msgdlg.h"
  47     #include "wx/fontdlg.h"
  48     #include "wx/choicdlg.h"
  49 #endif // wxUSE_GUI
  50
  51 #include "wx/encconv.h"
  52
  53 // ----------------------------------------------------------------------------
  54 // constants
  55 // ----------------------------------------------------------------------------
  56
  57 // the config paths we use
  58 static const wxChar* FONTMAPPER_ROOT_PATH = wxT("/wxWindows/FontMapper");
  59 static const wxChar* FONTMAPPER_CHARSET_PATH = wxT("Charsets");
  60 static const wxChar* FONTMAPPER_CHARSET_ALIAS_PATH = wxT("Aliases");
  61
  62 // we only ask questions in GUI mode
  63 #if wxUSE_GUI
  64     static const wxChar* FONTMAPPER_FONT_FROM_ENCODING_PATH = wxT("Encodings");
  65     static const wxChar* FONTMAPPER_FONT_DONT_ASK = wxT("none");
  66 #endif // wxUSE_GUI
  67
  68 // encodings supported by GetEncodingDescription
  69 static wxFontEncoding gs_encodings[] =
  70 {
  71     wxFONTENCODING_ISO8859_1,
  72     wxFONTENCODING_ISO8859_2,
  73     wxFONTENCODING_ISO8859_3,
  74     wxFONTENCODING_ISO8859_4,
  75     wxFONTENCODING_ISO8859_5,
  76     wxFONTENCODING_ISO8859_6,
  77     wxFONTENCODING_ISO8859_7,
  78     wxFONTENCODING_ISO8859_8,
  79     wxFONTENCODING_ISO8859_9,
  80     wxFONTENCODING_ISO8859_10,
  81     wxFONTENCODING_ISO8859_11,
  82     wxFONTENCODING_ISO8859_12,
  83     wxFONTENCODING_ISO8859_13,
  84     wxFONTENCODING_ISO8859_14,
  85     wxFONTENCODING_ISO8859_15,
  86     wxFONTENCODING_KOI8,
  87     wxFONTENCODING_CP1250,
  88     wxFONTENCODING_CP1251,
  89     wxFONTENCODING_CP1252,
  90     wxFONTENCODING_CP1253,
  91     wxFONTENCODING_CP1254,
  92     wxFONTENCODING_CP1255,
  93     wxFONTENCODING_CP1256,
  94     wxFONTENCODING_CP1257,
  95     wxFONTENCODING_CP437,
  96     wxFONTENCODING_UTF7,
  97     wxFONTENCODING_UTF8,
  98 };
  99
 100 // the descriptions for them
 101 static const wxChar* gs_encodingDescs[] =
 102 {
 103     wxTRANSLATE( "Western European (ISO-8859-1)" ),
 104     wxTRANSLATE( "Central European (ISO-8859-2)" ),
 105     wxTRANSLATE( "Esperanto (ISO-8859-3)" ),
 106     wxTRANSLATE( "Baltic (old) (ISO-8859-4)" ),
 107     wxTRANSLATE( "Cyrillic (ISO-8859-5)" ),
 108     wxTRANSLATE( "Arabic (ISO-8859-6)" ),
 109     wxTRANSLATE( "Greek (ISO-8859-7)" ),
 110     wxTRANSLATE( "Hebrew (ISO-8859-8)" ),
 111     wxTRANSLATE( "Turkish (ISO-8859-9)" ),
 112     wxTRANSLATE( "Nordic (ISO-8859-10)" ),
 113     wxTRANSLATE( "Thai (ISO-8859-11)" ),
 114     wxTRANSLATE( "Indian (ISO-8859-12)" ),
 115     wxTRANSLATE( "Baltic (ISO-8859-13)" ),
 116     wxTRANSLATE( "Celtic (ISO-8859-14)" ),
 117     wxTRANSLATE( "Western European with Euro (ISO-8859-15)" ),
 118     wxTRANSLATE( "KOI8-R" ),
 119     wxTRANSLATE( "Windows Central European (CP 1250)" ),
 120     wxTRANSLATE( "Windows Cyrillic (CP 1251)" ),
 121     wxTRANSLATE( "Windows Western European (CP 1252)" ),
 122     wxTRANSLATE( "Windows Greek (CP 1253)" ),
 123     wxTRANSLATE( "Windows Turkish (CP 1254)" ),
 124     wxTRANSLATE( "Windows Hebrew (CP 1255)" ),
 125     wxTRANSLATE( "Windows Arabic (CP 1256)" ),
 126     wxTRANSLATE( "Windows Baltic (CP 1257)" ),
 127     wxTRANSLATE( "Windows/DOS OEM (CP 437)" ),
 128     wxTRANSLATE( "Unicode 7 bit (UTF-7)" ),
 129     wxTRANSLATE( "Unicode 8 bit (UTF-8)" ),
 130 };
 131
 132 // and the internal names
 133 static const wxChar* gs_encodingNames[] =
 134 {
 135     wxT( "iso-8859-1" ),
 136     wxT( "iso-8859-2" ),
 137     wxT( "iso-8859-3" ),
 138     wxT( "iso-8859-4" ),
 139     wxT( "iso-8859-5" ),
 140     wxT( "iso-8859-6" ),
 141     wxT( "iso-8859-7" ),
 142     wxT( "iso-8859-8" ),
 143     wxT( "iso-8859-9" ),
 144     wxT( "iso-8859-10" ),
 145     wxT( "iso-8859-11" ),
 146     wxT( "iso-8859-12" ),
 147     wxT( "iso-8859-13" ),
 148     wxT( "iso-8859-14" ),
 149     wxT( "iso-8859-15" ),
 150     wxT( "koi8-r" ),
 151     wxT( "windows-1250" ),
 152     wxT( "windows-1251" ),
 153     wxT( "windows-1252" ),
 154     wxT( "windows-1253" ),
 155     wxT( "windows-1254" ),
 156     wxT( "windows-1255" ),
 157     wxT( "windows-1256" ),
 158     wxT( "windows-1257" ),
 159     wxT( "windows-437" ),
 160     wxT( "utf7" ),
 161     wxT( "utf8" ),
 162 };
 163
 164 // ----------------------------------------------------------------------------
 165 // global data
 166 // ----------------------------------------------------------------------------
 167
 168 // private object
 169 static wxFontMapper gs_fontMapper;
 170
 171 // and public pointer
 172 wxFontMapper * wxTheFontMapper = &gs_fontMapper;
 173
 174 // ----------------------------------------------------------------------------
 175 // private classes
 176 // ----------------------------------------------------------------------------
 177
 178 // change the config path during the lifetime of this object
 179 class wxFontMapperPathChanger
 180 {
 181 public:
 182     wxFontMapperPathChanger(wxFontMapper *fontMapper, const wxString& path)
 183     {
 184         m_fontMapper = fontMapper;
 185         m_ok = m_fontMapper->ChangePath(path, &m_pathOld);
 186     }
 187
 188     bool IsOk() const { return m_ok; }
 189
 190     ~wxFontMapperPathChanger()
 191     {
 192         if ( IsOk() )
 193             m_fontMapper->RestorePath(m_pathOld);
 194     }
 195
 196 private:
 197     wxFontMapper *m_fontMapper;
 198     bool          m_ok;
 199     wxString      m_pathOld;
 200 };
 201
 202 // ============================================================================
 203 // implementation
 204 // ============================================================================
 205
 206 // ----------------------------------------------------------------------------
 207 // ctor and dtor
 208 // ----------------------------------------------------------------------------
 209
 210 wxFontMapper::wxFontMapper()
 211 {
 212 #if wxUSE_CONFIG
 213     m_config = NULL;
 214 #endif // wxUSE_CONFIG
 215
 216 #if wxUSE_GUI
 217     m_windowParent = NULL;
 218 #endif // wxUSE_GUI
 219 }
 220
 221 wxFontMapper::~wxFontMapper()
 222 {
 223 }
 224
 225 // ----------------------------------------------------------------------------
 226 // customisation
 227 // ----------------------------------------------------------------------------
 228
 229 #if wxUSE_CONFIG
 230
 231 /* static */ const wxChar *wxFontMapper::GetDefaultConfigPath()
 232 {
 233     return FONTMAPPER_ROOT_PATH;
 234 }
 235
 236 void wxFontMapper::SetConfigPath(const wxString& prefix)
 237 {
 238     wxCHECK_RET( !prefix.IsEmpty() && prefix[0] == wxCONFIG_PATH_SEPARATOR,
 239                  wxT("an absolute path should be given to wxFontMapper::SetConfigPath()") );
 240
 241     m_configRootPath = prefix;
 242 }
 243
 244 // ----------------------------------------------------------------------------
 245 // get config object and path for it
 246 // ----------------------------------------------------------------------------
 247
 248 wxConfigBase *wxFontMapper::GetConfig()
 249 {
 250     if ( !m_config )
 251     {
 252         // try the default
 253         m_config = wxConfig::Get(FALSE /*don't create on demand*/ );
 254
 255         if ( !m_config )
 256         {
 257             // we still want to have a config object because otherwise we would
 258             // keep asking the user the same questions in the interactive mode,
 259             // so create a dummy config which won't write to any files/registry
 260             // but will allow us to remember the results of the questions at
 261             // least during this run
 262             m_config = new wxMemoryConfig;
 263             wxConfig::Set(m_config);
 264         }
 265     }
 266
 267     return m_config;
 268 }
 269
 270 const wxString& wxFontMapper::GetConfigPath()
 271 {
 272     if ( !m_configRootPath )
 273     {
 274         // use the default
 275         m_configRootPath = GetDefaultConfigPath();
 276     }
 277
 278     return m_configRootPath;
 279 }
 280 #endif
 281
 282 bool wxFontMapper::ChangePath(const wxString& pathNew, wxString *pathOld)
 283 {
 284 #if wxUSE_CONFIG
 285     wxConfigBase *config = GetConfig();
 286     if ( !config )
 287         return FALSE;
 288
 289     *pathOld = config->GetPath();
 290
 291     wxString path = GetConfigPath();
 292     if ( path.IsEmpty() || path.Last() != wxCONFIG_PATH_SEPARATOR )
 293     {
 294         path += wxCONFIG_PATH_SEPARATOR;
 295     }
 296
 297     wxASSERT_MSG( !pathNew || (pathNew[0] != wxCONFIG_PATH_SEPARATOR),
 298                   wxT("should be a relative path") );
 299
 300     path += pathNew;
 301
 302     config->SetPath(path);
 303
 304     return TRUE;
 305 #else
 306     return FALSE;
 307 #endif
 308 }
 309
 310 void wxFontMapper::RestorePath(const wxString& pathOld)
 311 {
 312 #if wxUSE_CONFIG
 313     GetConfig()->SetPath(pathOld);
 314 #else
 315 #endif
 316 }
 317
 318 // ----------------------------------------------------------------------------
 319 // charset/encoding correspondence
 320 // ----------------------------------------------------------------------------
 321
 322 /* static */
 323 wxString wxFontMapper::GetEncodingDescription(wxFontEncoding encoding)
 324 {
 325     if ( encoding == wxFONTENCODING_DEFAULT )
 326     {
 327         return _("Default encoding");
 328     }
 329
 330     size_t count = WXSIZEOF(gs_encodingDescs);
 331
 332     wxASSERT_MSG( count == WXSIZEOF(gs_encodings),
 333                   wxT("inconsitency detected - forgot to update one of the arrays?") );
 334
 335     for ( size_t i = 0; i < count; i++ )
 336     {
 337         if ( gs_encodings[i] == encoding )
 338         {
 339             return wxGetTranslation(gs_encodingDescs[i]);
 340         }
 341     }
 342
 343     wxString str;
 344     str.Printf(_("Unknown encoding (%d)"), encoding);
 345
 346     return str;
 347 }
 348
 349 /* static */
 350 wxString wxFontMapper::GetEncodingName(wxFontEncoding encoding)
 351 {
 352     if ( encoding == wxFONTENCODING_DEFAULT )
 353     {
 354         return _("default");
 355     }
 356
 357     size_t count = WXSIZEOF(gs_encodingNames);
 358
 359     wxASSERT_MSG( count == WXSIZEOF(gs_encodings),
 360                   wxT("inconsistency detected - forgot to update one of the arrays?") );
 361
 362     for ( size_t i = 0; i < count; i++ )
 363     {
 364         if ( gs_encodings[i] == encoding )
 365         {
 366             return wxGetTranslation(gs_encodingNames[i]);
 367         }
 368     }
 369
 370     wxString str;
 371     str.Printf(_("unknown-%d"), encoding);
 372
 373     return str;
 374 }
 375
 376 wxFontEncoding wxFontMapper::CharsetToEncoding(const wxString& charset,
 377                                                bool interactive)
 378 {
 379     wxFontEncoding encoding = wxFONTENCODING_SYSTEM;
 380
 381     // we're going to modify it, make a copy
 382     wxString cs = charset;
 383
 384 #if wxUSE_CONFIG
 385     // first try the user-defined settings
 386     wxString pathOld;
 387     if ( ChangePath(FONTMAPPER_CHARSET_PATH, &pathOld) )
 388     {
 389         wxConfigBase *config = GetConfig();
 390
 391         // do we have an encoding for this charset?
 392         long value = config->Read(charset, -1l);
 393         if ( value != -1 )
 394         {
 395             if ( value >= 0 && value <= wxFONTENCODING_MAX )
 396             {
 397                 encoding = (wxFontEncoding)value;
 398             }
 399             else
 400             {
 401                 wxLogDebug(wxT("corrupted config data: invalid encoding %ld for charset '%s' ignored"),
 402                            value, charset.c_str());
 403             }
 404         }
 405
 406         if ( encoding == wxFONTENCODING_SYSTEM )
 407         {
 408             // may be we have an alias?
 409             config->SetPath(FONTMAPPER_CHARSET_ALIAS_PATH);
 410
 411             wxString alias = config->Read(charset);
 412             if ( !!alias )
 413             {
 414                 // yes, we do - use it instead
 415                 cs = alias;
 416             }
 417         }
 418
 419         RestorePath(pathOld);
 420     }
 421 #endif
 422
 423     // if didn't find it there, try to recognize it ourselves
 424     if ( encoding == wxFONTENCODING_SYSTEM )
 425     {
 426         // trim any spaces
 427         cs.Trim(TRUE);
 428         cs.Trim(FALSE);
 429
 430         // discard the optional quotes
 431         if ( !!cs )
 432         {
 433             if ( cs[0u] == _T('"') && cs.Last() == _T('"') )
 434             {
 435                 cs = wxString(cs.c_str(), cs.length() - 1);
 436             }
 437         }
 438
 439         cs.MakeUpper();
 440
 441         if ( !cs || cs == wxT("US-ASCII") )
 442         {
 443             encoding = wxFONTENCODING_DEFAULT;
 444         }
 445         else if ( cs == wxT("UTF-7") )
 446         {
 447             encoding = wxFONTENCODING_UTF7;
 448         }
 449         else if ( cs == wxT("UTF-8") )
 450         {
 451             encoding = wxFONTENCODING_UTF8;
 452         }
 453         else if ( cs == wxT("KOI8-R") ||
 454                   cs == wxT("KOI8-U") ||
 455                   cs == wxT("KOI8-RU") )
 456         {
 457             // although koi8-ru is not strictly speaking the same as koi8-r,
 458             // they are similar enough to make mapping it to koi8 better than
 459             // not reckognizing it at all
 460             encoding = wxFONTENCODING_KOI8;
 461         }
 462         else if ( cs.Left(3) == wxT("ISO") )
 463         {
 464             // the dash is optional (or, to be exact, it is not, but
 465             // several brokenmails "forget" it)
 466             const wxChar *p = cs.c_str() + 3;
 467             if ( *p == wxT('-') )
 468                 p++;
 469
 470             unsigned int value;
 471             if ( wxSscanf(p, wxT("8859-%u"), &value) == 1 )
 472             {
 473                 // make it 0 based and check that it is strictly positive in
 474                 // the process (no such thing as iso8859-0 encoding)
 475                 if ( (value-- > 0) &&
 476                      (value < wxFONTENCODING_ISO8859_MAX -
 477                               wxFONTENCODING_ISO8859_1) )
 478                 {
 479                     // it's a valid ISO8859 encoding
 480                     value += wxFONTENCODING_ISO8859_1;
 481                     encoding = (wxFontEncoding)value;
 482                 }
 483             }
 484         }
 485         else // check for Windows charsets
 486         {
 487             size_t len;
 488             if ( cs.Left(7) == wxT("WINDOWS") )
 489             {
 490                 len = 7;
 491             }
 492             else if ( cs.Left(2) == wxT("CP") )
 493             {
 494                 len = 2;
 495             }
 496             else // not a Windows encoding
 497             {
 498                 len = 0;
 499             }
 500
 501             if ( len )
 502             {
 503                 const wxChar *p = cs.c_str() + len;
 504                 if ( *p == wxT('-') )
 505                     p++;
 506
 507                 int value;
 508                 if ( wxSscanf(p, wxT("%u"), &value) == 1 )
 509                 {
 510                     if ( value >= 1250 )
 511                     {
 512                         value -= 1250;
 513                         if ( value < wxFONTENCODING_CP12_MAX -
 514                                      wxFONTENCODING_CP1250 )
 515                         {
 516                             // a valid Windows code page
 517                             value += wxFONTENCODING_CP1250;
 518                             encoding = (wxFontEncoding)value;
 519                         }
 520                     }
 521                 }
 522             }
 523         }
 524         //else: unknown
 525     }
 526
 527 #if wxUSE_GUI
 528     // if still no luck, ask the user - unless disabled
 529     if ( (encoding == wxFONTENCODING_SYSTEM) && interactive )
 530     {
 531         // prepare the dialog data
 532
 533         // the dialog title
 534         wxString title(m_titleDialog);
 535         if ( !title )
 536             title << wxTheApp->GetAppName() << _(": unknown charset");
 537
 538         // the message
 539         wxString msg;
 540         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());
 541
 542         // the list of choices
 543         size_t count = WXSIZEOF(gs_encodingDescs);
 544
 545         wxASSERT_MSG( count == WXSIZEOF(gs_encodings),
 546                       wxT("inconsitency detected - forgot to update one of the arrays?") );
 547
 548         wxString *encodingNamesTranslated = new wxString[count];
 549
 550         for ( size_t i = 0; i < count; i++ )
 551         {
 552             encodingNamesTranslated[i] = wxGetTranslation(gs_encodingDescs[i]);
 553         }
 554
 555         // the parent window
 556         wxWindow *parent = m_windowParent;
 557         if ( !parent )
 558             parent = wxTheApp->GetTopWindow();
 559
 560         // do ask the user and get back the index in encodings table
 561         int n = wxGetSingleChoiceIndex(msg, title,
 562                                        count,
 563                                        encodingNamesTranslated,
 564                                        parent);
 565
 566         delete [] encodingNamesTranslated;
 567
 568         if ( n != -1 )
 569         {
 570             encoding = gs_encodings[n];
 571
 572 #if wxUSE_CONFIG
 573         // save the result in the config now
 574             if ( ChangePath(FONTMAPPER_CHARSET_PATH, &pathOld) )
 575             {
 576                 wxConfigBase *config = GetConfig();
 577
 578                 // remember the alt encoding for this charset
 579                 if ( !config->Write(charset, (long)encoding) )
 580                 {
 581                     wxLogError(_("Failed to remember the encoding for the charset '%s'."), charset.c_str());
 582                 }
 583
 584                 RestorePath(pathOld);
 585             }
 586 #endif // wxUSE_CONFIG
 587         }
 588         //else: cancelled
 589     }
 590 #endif // wxUSE_GUI
 591
 592     return encoding;
 593 }
 594
 595 // ----------------------------------------------------------------------------
 596 // support for unknown encodings: we maintain a map between the
 597 // (platform-specific) strings identifying them and our wxFontEncodings they
 598 // correspond to which is used by GetFontForEncoding() function
 599 // ----------------------------------------------------------------------------
 600
 601 #if wxUSE_GUI
 602
 603 bool wxFontMapper::TestAltEncoding(const wxString& configEntry,
 604                                    wxFontEncoding encReplacement,
 605                                    wxNativeEncodingInfo *info)
 606 {
 607     if ( wxGetNativeFontEncoding(encReplacement, info) &&
 608          wxTestFontEncoding(*info) )
 609     {
 610 #if wxUSE_CONFIG
 611         // remember the mapping in the config
 612         wxFontMapperPathChanger path(this, FONTMAPPER_FONT_FROM_ENCODING_PATH);
 613
 614         if ( path.IsOk() )
 615         {
 616             GetConfig()->Write(configEntry, info->ToString());
 617         }
 618 #endif // wxUSE_CONFIG
 619         return TRUE;
 620     }
 621
 622     return FALSE;
 623 }
 624
 625 #if wxUSE_GUI
 626 class ReentrancyBlocker
 627 {
 628 public:
 629     ReentrancyBlocker(bool& b) : m_b(b) { m_b = TRUE; }
 630     ~ReentrancyBlocker() { m_b = FALSE; }
 631
 632 private:
 633     bool& m_b;
 634 };
 635 #endif
 636
 637 bool wxFontMapper::GetAltForEncoding(wxFontEncoding encoding,
 638                                      wxNativeEncodingInfo *info,
 639                                      const wxString& facename,
 640                                      bool interactive)
 641 {
 642 #if wxUSE_GUI
 643     // we need a flag to prevent infinite recursion which happens, for
 644     // example, when GetAltForEncoding() is called from an OnPaint() handler:
 645     // in this case, wxYield() which is called from wxMessageBox() we use here
 646     // will lead to another call of OnPaint() and hence to another call of
 647     // GetAltForEncoding() - and it is impossible to catch this from the user
 648     // code because we are called from wxFont ctor implicitly.
 649
 650     // assume we're always called from the main thread, so that it is safe to
 651     // use a static var
 652     static bool s_inGetAltForEncoding = FALSE;
 653
 654     if ( interactive && s_inGetAltForEncoding )
 655         return FALSE;
 656
 657     ReentrancyBlocker blocker(s_inGetAltForEncoding);
 658 #endif // wxUSE_GUI
 659
 660     wxCHECK_MSG( info, FALSE, wxT("bad pointer in GetAltForEncoding") );
 661
 662     info->facename = facename;
 663
 664     if ( encoding == wxFONTENCODING_DEFAULT )
 665     {
 666         encoding = wxFont::GetDefaultEncoding();
 667     }
 668
 669     // if we failed to load the system default encoding, something is really
 670     // wrong and we'd better stop now - otherwise we will go into endless
 671     // recursion trying to create the font in the msg box with the error
 672     // message
 673     if ( encoding == wxFONTENCODING_SYSTEM )
 674     {
 675         wxFatalError(_("can't load any font, aborting"));
 676
 677         // wxFatalError doesn't return
 678     }
 679
 680     wxString configEntry, encName = GetEncodingName(encoding);
 681     if ( !!facename )
 682     {
 683         configEntry = facename + _T("_");
 684     }
 685     configEntry += encName;
 686
 687 #if wxUSE_CONFIG
 688     // do we have a font spec for this encoding?
 689     wxString pathOld;
 690     if ( ChangePath(FONTMAPPER_FONT_FROM_ENCODING_PATH, &pathOld) )
 691     {
 692         wxConfigBase *config = GetConfig();
 693
 694         wxString fontinfo = config->Read(configEntry);
 695
 696         RestorePath(pathOld);
 697
 698         // this special value means that we don't know of fonts for this
 699         // encoding but, moreover, have already asked the user as well and he
 700         // didn't specify any font neither
 701         if ( fontinfo == FONTMAPPER_FONT_DONT_ASK )
 702         {
 703             interactive = FALSE;
 704         }
 705         else // use the info entered the last time
 706         {
 707             if ( !!fontinfo && !!facename )
 708             {
 709                 // we tried to find a match with facename - now try without it
 710                 fontinfo = config->Read(encName);
 711             }
 712
 713             if ( !!fontinfo )
 714             {
 715                 if ( info->FromString(fontinfo) )
 716                 {
 717                     if ( wxTestFontEncoding(*info) )
 718                     {
 719                         // ok, got something
 720                         return TRUE;
 721                     }
 722                     //else: no such fonts, look for something else
 723                     //      (should we erase the outdated value?)
 724                 }
 725                 else
 726                 {
 727                     wxLogDebug(wxT("corrupted config data: string '%s' is not a valid font encoding info"),
 728                                fontinfo.c_str());
 729                 }
 730             }
 731             //else: there is no information in config about this encoding
 732         }
 733     }
 734 #endif // wxUSE_CONFIG
 735
 736     // ask the user
 737     if ( interactive )
 738     {
 739         wxString title(m_titleDialog);
 740         if ( !title )
 741             title << wxTheApp->GetAppName() << _(": unknown encoding");
 742
 743         // the message
 744         wxString msg;
 745         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)?"),
 746                      GetEncodingDescription(encoding).c_str());
 747
 748         wxWindow *parent = m_windowParent;
 749         if ( !parent )
 750             parent = wxTheApp->GetTopWindow();
 751
 752         if ( wxMessageBox(msg, title,
 753                           wxICON_QUESTION | wxYES_NO, parent) == wxYES )
 754         {
 755             wxFontData data;
 756             data.SetEncoding(encoding);
 757             data.EncodingInfo() = *info;
 758             wxFontDialog dialog(parent, &data);
 759             if ( dialog.ShowModal() == wxID_OK )
 760             {
 761                 wxFontData retData = dialog.GetFontData();
 762                 wxFont font = retData.GetChosenFont();
 763
 764                 *info = retData.EncodingInfo();
 765                 info -> encoding = retData.GetEncoding();
 766
 767 #if wxUSE_CONFIG
 768                 // remember this in the config
 769                 if ( ChangePath(FONTMAPPER_FONT_FROM_ENCODING_PATH, &pathOld) )
 770                 {
 771                     GetConfig()->Write(configEntry, info->ToString());
 772
 773                     RestorePath(pathOld);
 774                 }
 775 #endif // wxUSE_CONFIG
 776
 777                 return TRUE;
 778             }
 779             //else: the user canceled the font selection dialog
 780         }
 781         else
 782         {
 783             // the user doesn't want to select a font for this encoding,
 784             // remember it to avoid asking the same question again later
 785 #if wxUSE_CONFIG
 786             if ( ChangePath(FONTMAPPER_FONT_FROM_ENCODING_PATH, &pathOld) )
 787             {
 788                 GetConfig()->Write(configEntry, FONTMAPPER_FONT_DONT_ASK);
 789
 790                 RestorePath(pathOld);
 791             }
 792 #endif // wxUSE_CONFIG
 793         }
 794     }
 795     //else: we're in non-interactive mode
 796
 797     // now try the default mappings:
 798     wxFontEncodingArray equiv = wxEncodingConverter::GetAllEquivalents(encoding);
 799     size_t count = equiv.GetCount();
 800     if ( count )
 801     {
 802         for ( size_t i = (equiv[0] == encoding) ? 1 : 0; i < count; i++ )
 803         {
 804             if ( TestAltEncoding(configEntry, equiv[i], info) )
 805                 return TRUE;
 806         }
 807     }
 808
 809     return FALSE;
 810 }
 811
 812 bool wxFontMapper::GetAltForEncoding(wxFontEncoding encoding,
 813                                      wxFontEncoding *alt_encoding,
 814                                      const wxString& facename,
 815                                      bool interactive)
 816 {
 817     wxNativeEncodingInfo info;
 818     bool r = GetAltForEncoding(encoding, &info, facename, interactive);
 819     *alt_encoding = info.encoding;
 820     return r;
 821 }
 822
 823 bool wxFontMapper::IsEncodingAvailable(wxFontEncoding encoding,
 824                                        const wxString& facename)
 825 {
 826     wxNativeEncodingInfo info;
 827
 828     if (wxGetNativeFontEncoding(encoding, &info))
 829     {
 830         info.facename = facename;
 831         return wxTestFontEncoding(info);
 832     }
 833
 834     return FALSE;
 835 }
 836
 837 #endif // wxUSE_GUI