src/gtk1/font.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk1/font.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Robert Roebling and Julian Smart
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 // ============================================================================
  11 // declarations
  12 // ============================================================================
  13
  14 // ----------------------------------------------------------------------------
  15 // headers
  16 // ----------------------------------------------------------------------------
  17
  18 // For compilers that support precompilation, includes "wx.h".
  19 #include "wx/wxprec.h"
  20
  21 #include "wx/font.h"
  22
  23 #ifndef WX_PRECOMP
  24     #include "wx/log.h"
  25     #include "wx/settings.h"
  26     #include "wx/cmndata.h"
  27     #include "wx/gdicmn.h"
  28 #endif
  29
  30 #include "wx/fontutil.h"
  31 #include "wx/utils.h"
  32 #include "wx/tokenzr.h"
  33
  34 #include <strings.h>
  35
  36 #include "wx/gtk1/private.h"
  37 #include <gdk/gdkprivate.h>
  38
  39 // ----------------------------------------------------------------------------
  40 // constants
  41 // ----------------------------------------------------------------------------
  42
  43 // the default size (in points) for the fonts
  44 static const int wxDEFAULT_FONT_SIZE = 12;
  45
  46 // ----------------------------------------------------------------------------
  47 // wxScaledFontList: maps the font sizes to the GDK fonts for the given font
  48 // ----------------------------------------------------------------------------
  49
  50 WX_DECLARE_HASH_MAP(int, GdkFont *, wxIntegerHash, wxIntegerEqual,
  51                     wxScaledFontList);
  52
  53 // ----------------------------------------------------------------------------
  54 // wxFontRefData
  55 // ----------------------------------------------------------------------------
  56
  57 class wxFontRefData : public wxObjectRefData
  58 {
  59 public:
  60     // from broken down font parameters, also default ctor
  61     wxFontRefData(int size = -1,
  62                   int family = wxFONTFAMILY_DEFAULT,
  63                   int style = wxFONTSTYLE_NORMAL,
  64                   int weight = wxFONTWEIGHT_NORMAL,
  65                   bool underlined = false,
  66                   const wxString& faceName = wxEmptyString,
  67                   wxFontEncoding encoding = wxFONTENCODING_DEFAULT);
  68
  69     // from XFLD
  70     wxFontRefData(const wxString& fontname);
  71
  72     // copy ctor
  73     wxFontRefData( const wxFontRefData& data );
  74
  75     virtual ~wxFontRefData();
  76
  77     // do we have the native font info?
  78     bool HasNativeFont() const
  79     {
  80         // only use m_nativeFontInfo if it had been initialized
  81         return !m_nativeFontInfo.IsDefault();
  82     }
  83
  84     // setters: all of them also take care to modify m_nativeFontInfo if we
  85     // have it so as to not lose the information not carried by our fields
  86     void SetPointSize(int pointSize);
  87     void SetFamily(int family);
  88     void SetStyle(int style);
  89     void SetWeight(int weight);
  90     void SetUnderlined(bool underlined);
  91     bool SetFaceName(const wxString& facename);
  92     void SetEncoding(wxFontEncoding encoding);
  93
  94     void SetNoAntiAliasing( bool no = true ) { m_noAA = no; }
  95     bool GetNoAntiAliasing() const { return m_noAA; }
  96
  97     // and this one also modifies all the other font data fields
  98     void SetNativeFontInfo(const wxNativeFontInfo& info);
  99
 100     // debugger helper: shows what the font really is
 101     //
 102     // VZ: I need this as my gdb either shows wildly wrong values or crashes
 103     //     when I ask it to "p fontRefData" :-(
 104 #if defined(__WXDEBUG__)
 105     void Dump() const
 106     {
 107         wxPrintf(_T("%s-%s-%s-%d-%d\n"),
 108                  m_faceName.c_str(),
 109                  m_weight == wxFONTWEIGHT_NORMAL
 110                     ? _T("normal")
 111                     : m_weight == wxFONTWEIGHT_BOLD
 112                         ? _T("bold")
 113                         : _T("light"),
 114                  m_style == wxFONTSTYLE_NORMAL ? _T("regular") : _T("italic"),
 115                  m_pointSize,
 116                  m_encoding);
 117     }
 118 #endif // Debug
 119
 120 protected:
 121     // common part of all ctors
 122     void Init(int pointSize,
 123               int family,
 124               int style,
 125               int weight,
 126               bool underlined,
 127               const wxString& faceName,
 128               wxFontEncoding encoding);
 129
 130     // set all fields from (already initialized and valid) m_nativeFontInfo
 131     void InitFromNative();
 132
 133 private:
 134     // clear m_scaled_xfonts if any
 135     void ClearGdkFonts();
 136
 137     // the map of font sizes to "GdkFont *"
 138     wxScaledFontList  m_scaled_xfonts;
 139
 140     int             m_pointSize;
 141     int             m_family,
 142                     m_style,
 143                     m_weight;
 144     bool            m_underlined;
 145     wxString        m_faceName;
 146     wxFontEncoding  m_encoding;  // Unused under GTK 2.0
 147     bool            m_noAA;      // No anti-aliasing
 148
 149     // The native font info, basicly an XFLD under GTK 1.2 and
 150     // the pango font description under GTK 2.0.
 151     wxNativeFontInfo m_nativeFontInfo;
 152
 153     friend class wxFont;
 154 };
 155
 156 // ----------------------------------------------------------------------------
 157 // wxFontRefData
 158 // ----------------------------------------------------------------------------
 159
 160 void wxFontRefData::Init(int pointSize,
 161                          int family,
 162                          int style,
 163                          int weight,
 164                          bool underlined,
 165                          const wxString& faceName,
 166                          wxFontEncoding encoding)
 167 {
 168     m_family = family == wxFONTFAMILY_DEFAULT ? wxFONTFAMILY_SWISS : family;
 169
 170     m_faceName = faceName;
 171
 172     // we accept both wxDEFAULT and wxNORMAL here - should we?
 173     m_style = style == wxDEFAULT ? wxFONTSTYLE_NORMAL : style;
 174     m_weight = weight == wxDEFAULT ? wxFONTWEIGHT_NORMAL : weight;
 175
 176     // and here, do we really want to forbid creation of the font of the size
 177     // 90 (the value of wxDEFAULT)??
 178     m_pointSize = pointSize == wxDEFAULT || pointSize == -1
 179                     ? wxDEFAULT_FONT_SIZE
 180                     : pointSize;
 181
 182     m_underlined = underlined;
 183     m_encoding = encoding;
 184
 185     m_noAA = false;
 186 }
 187
 188 void wxFontRefData::InitFromNative()
 189 {
 190     m_noAA = false;
 191
 192     // get the font parameters from the XLFD
 193     // -------------------------------------
 194
 195     m_faceName = m_nativeFontInfo.GetXFontComponent(wxXLFD_FAMILY);
 196
 197     m_weight = wxFONTWEIGHT_NORMAL;
 198
 199     wxString w = m_nativeFontInfo.GetXFontComponent(wxXLFD_WEIGHT).Upper();
 200     if ( !w.empty() && w != _T('*') )
 201     {
 202         // the test below catches all of BOLD, EXTRABOLD, DEMIBOLD, ULTRABOLD
 203         // and BLACK
 204         if ( ((w[0u] == _T('B') && (!wxStrcmp(w.c_str() + 1, wxT("OLD")) ||
 205                                    !wxStrcmp(w.c_str() + 1, wxT("LACK"))))) ||
 206              wxStrstr(w.c_str() + 1, _T("BOLD")) )
 207         {
 208             m_weight = wxFONTWEIGHT_BOLD;
 209         }
 210         else if ( w == _T("LIGHT") || w == _T("THIN") )
 211         {
 212             m_weight = wxFONTWEIGHT_LIGHT;
 213         }
 214     }
 215
 216     switch ( wxToupper(*m_nativeFontInfo.
 217                             GetXFontComponent(wxXLFD_SLANT).c_str()) )
 218     {
 219         case _T('I'):   // italique
 220             m_style = wxFONTSTYLE_ITALIC;
 221             break;
 222
 223         case _T('O'):   // oblique
 224             m_style = wxFONTSTYLE_SLANT;
 225             break;
 226
 227         default:
 228             m_style = wxFONTSTYLE_NORMAL;
 229     }
 230
 231     long ptSize;
 232     if ( m_nativeFontInfo.GetXFontComponent(wxXLFD_POINTSIZE).ToLong(&ptSize) )
 233     {
 234         // size in XLFD is in 10 point units
 235         m_pointSize = (int)(ptSize / 10);
 236     }
 237     else
 238     {
 239         m_pointSize = wxDEFAULT_FONT_SIZE;
 240     }
 241
 242     // examine the spacing: if the font is monospaced, assume wxTELETYPE
 243     // family for compatibility with the old code which used it instead of
 244     // IsFixedWidth()
 245     if ( m_nativeFontInfo.GetXFontComponent(wxXLFD_SPACING).Upper() == _T('M') )
 246     {
 247         m_family = wxFONTFAMILY_TELETYPE;
 248     }
 249     else // not monospaceed
 250     {
 251         // don't even try guessing it, it doesn't work for too many fonts
 252         // anyhow
 253         m_family = wxFONTFAMILY_UNKNOWN;
 254     }
 255
 256     // X fonts are never underlined...
 257     m_underlined = false;
 258
 259     // deal with font encoding
 260     wxString
 261         registry = m_nativeFontInfo.GetXFontComponent(wxXLFD_REGISTRY).Upper(),
 262         encoding = m_nativeFontInfo.GetXFontComponent(wxXLFD_ENCODING).Upper();
 263
 264     if ( registry == _T("ISO8859") )
 265     {
 266         int cp;
 267         if ( wxSscanf(encoding, wxT("%d"), &cp) == 1 )
 268         {
 269             m_encoding = (wxFontEncoding)(wxFONTENCODING_ISO8859_1 + cp - 1);
 270         }
 271     }
 272     else if ( registry == _T("MICROSOFT") )
 273     {
 274         int cp;
 275         if ( wxSscanf(encoding, wxT("cp125%d"), &cp) == 1 )
 276         {
 277             m_encoding = (wxFontEncoding)(wxFONTENCODING_CP1250 + cp);
 278         }
 279     }
 280     else if ( registry == _T("KOI8") )
 281     {
 282         m_encoding = wxFONTENCODING_KOI8;
 283     }
 284     else // unknown encoding
 285     {
 286         // may be give a warning here? or use wxFontMapper?
 287         m_encoding = wxFONTENCODING_SYSTEM;
 288     }
 289 }
 290
 291 wxFontRefData::wxFontRefData( const wxFontRefData& data )
 292              : wxObjectRefData()
 293 {
 294     m_pointSize = data.m_pointSize;
 295     m_family = data.m_family;
 296     m_style = data.m_style;
 297     m_weight = data.m_weight;
 298
 299     m_underlined = data.m_underlined;
 300
 301     m_faceName = data.m_faceName;
 302     m_encoding = data.m_encoding;
 303
 304     m_noAA = data.m_noAA;
 305
 306     // Forces a copy of the internal data.  wxNativeFontInfo should probably
 307     // have a copy ctor and assignment operator to fix this properly but that
 308     // would break binary compatibility...
 309     m_nativeFontInfo.FromString(data.m_nativeFontInfo.ToString());
 310 }
 311
 312 wxFontRefData::wxFontRefData(int size, int family, int style,
 313                              int weight, bool underlined,
 314                              const wxString& faceName,
 315                              wxFontEncoding encoding)
 316 {
 317     Init(size, family, style, weight, underlined, faceName, encoding);
 318 }
 319
 320 wxFontRefData::wxFontRefData(const wxString& fontname)
 321 {
 322     // FromString() should really work in GTK1 too, doesn't it?
 323     m_nativeFontInfo.SetXFontName(fontname);
 324
 325     InitFromNative();
 326 }
 327
 328 void wxFontRefData::ClearGdkFonts()
 329 {
 330     for ( wxScaledFontList::iterator i = m_scaled_xfonts.begin();
 331           i != m_scaled_xfonts.end();
 332           ++i )
 333     {
 334         GdkFont *font = i->second;
 335         gdk_font_unref( font );
 336     }
 337
 338     m_scaled_xfonts.clear();
 339 }
 340
 341 wxFontRefData::~wxFontRefData()
 342 {
 343     ClearGdkFonts();
 344 }
 345
 346 // ----------------------------------------------------------------------------
 347 // wxFontRefData SetXXX()
 348 // ----------------------------------------------------------------------------
 349
 350 void wxFontRefData::SetPointSize(int pointSize)
 351 {
 352     m_pointSize = pointSize;
 353
 354     if ( HasNativeFont() )
 355     {
 356         wxString size;
 357         if ( pointSize == -1 )
 358             size = _T('*');
 359         else
 360             size.Printf(_T("%d"), 10*pointSize);
 361
 362         m_nativeFontInfo.SetXFontComponent(wxXLFD_POINTSIZE, size);
 363     }
 364 }
 365
 366 void wxFontRefData::SetFamily(int family)
 367 {
 368     m_family = family;
 369
 370     // TODO: what are we supposed to do with m_nativeFontInfo here?
 371 }
 372
 373 void wxFontRefData::SetStyle(int style)
 374 {
 375     m_style = style;
 376
 377     if ( HasNativeFont() )
 378     {
 379         wxString slant;
 380         switch ( style )
 381         {
 382             case wxFONTSTYLE_ITALIC:
 383                 slant = _T('i');
 384                 break;
 385
 386             case wxFONTSTYLE_SLANT:
 387                 slant = _T('o');
 388                 break;
 389
 390             default:
 391                 wxFAIL_MSG( _T("unknown font style") );
 392                 // fall through
 393
 394             case wxFONTSTYLE_NORMAL:
 395                 slant = _T('r');
 396         }
 397
 398         m_nativeFontInfo.SetXFontComponent(wxXLFD_SLANT, slant);
 399     }
 400 }
 401
 402 void wxFontRefData::SetWeight(int weight)
 403 {
 404     m_weight = weight;
 405
 406     if ( HasNativeFont() )
 407     {
 408         wxString boldness;
 409         switch ( weight )
 410         {
 411             case wxFONTWEIGHT_BOLD:
 412                 boldness = _T("bold");
 413                 break;
 414
 415             case wxFONTWEIGHT_LIGHT:
 416                 boldness = _T("light");
 417                 break;
 418
 419             default:
 420                 wxFAIL_MSG( _T("unknown font weight") );
 421                 // fall through
 422
 423             case wxFONTWEIGHT_NORMAL:
 424                 // unspecified
 425                 boldness = _T("medium");
 426         }
 427
 428         m_nativeFontInfo.SetXFontComponent(wxXLFD_WEIGHT, boldness);
 429     }
 430 }
 431
 432 void wxFontRefData::SetUnderlined(bool underlined)
 433 {
 434     m_underlined = underlined;
 435
 436     // the XLFD doesn't have "underlined" field anyhow
 437 }
 438
 439 bool wxFontRefData::SetFaceName(const wxString& facename)
 440 {
 441     m_faceName = facename;
 442
 443     if ( HasNativeFont() )
 444     {
 445         m_nativeFontInfo.SetXFontComponent(wxXLFD_FAMILY, facename);
 446     }
 447
 448     return true;
 449 }
 450
 451 void wxFontRefData::SetEncoding(wxFontEncoding encoding)
 452 {
 453     m_encoding = encoding;
 454
 455     if ( HasNativeFont() )
 456     {
 457         wxNativeEncodingInfo info;
 458         if ( wxGetNativeFontEncoding(encoding, &info) )
 459         {
 460             m_nativeFontInfo.SetXFontComponent(wxXLFD_REGISTRY, info.xregistry);
 461             m_nativeFontInfo.SetXFontComponent(wxXLFD_ENCODING, info.xencoding);
 462         }
 463     }
 464 }
 465
 466 void wxFontRefData::SetNativeFontInfo(const wxNativeFontInfo& info)
 467 {
 468     // previously cached fonts shouldn't be used
 469     ClearGdkFonts();
 470
 471     m_nativeFontInfo = info;
 472
 473     // set all the other font parameters from the native font info
 474     InitFromNative();
 475 }
 476
 477 // ----------------------------------------------------------------------------
 478 // wxFont creation
 479 // ----------------------------------------------------------------------------
 480
 481 IMPLEMENT_DYNAMIC_CLASS(wxFont, wxGDIObject)
 482
 483 wxFont::wxFont(const wxNativeFontInfo& info)
 484 {
 485     (void) Create(info.GetXFontName());
 486 }
 487
 488 bool wxFont::Create( int pointSize,
 489                      int family,
 490                      int style,
 491                      int weight,
 492                      bool underlined,
 493                      const wxString& face,
 494                      wxFontEncoding encoding)
 495 {
 496     UnRef();
 497
 498     m_refData = new wxFontRefData(pointSize, family, style, weight,
 499                                   underlined, face, encoding);
 500
 501     return true;
 502 }
 503
 504 bool wxFont::Create(const wxString& fontname)
 505 {
 506     // VZ: does this really happen?
 507     if ( fontname.empty() )
 508     {
 509         *this = wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT);
 510
 511         return true;
 512     }
 513
 514     m_refData = new wxFontRefData(fontname);
 515
 516     return true;
 517 }
 518
 519 void wxFont::Unshare()
 520 {
 521     if (!m_refData)
 522     {
 523         m_refData = new wxFontRefData();
 524     }
 525     else
 526     {
 527         wxFontRefData* ref = new wxFontRefData(*(wxFontRefData*)m_refData);
 528         UnRef();
 529         m_refData = ref;
 530     }
 531 }
 532
 533 wxFont::~wxFont()
 534 {
 535 }
 536
 537 // ----------------------------------------------------------------------------
 538 // accessors
 539 // ----------------------------------------------------------------------------
 540
 541 int wxFont::GetPointSize() const
 542 {
 543     wxCHECK_MSG( Ok(), 0, wxT("invalid font") );
 544
 545     return M_FONTDATA->m_pointSize;
 546 }
 547
 548 wxString wxFont::GetFaceName() const
 549 {
 550     wxCHECK_MSG( Ok(), wxEmptyString, wxT("invalid font") );
 551
 552     return M_FONTDATA->m_faceName;
 553 }
 554
 555 int wxFont::GetFamily() const
 556 {
 557     wxCHECK_MSG( Ok(), 0, wxT("invalid font") );
 558
 559     return M_FONTDATA->m_family;
 560 }
 561
 562 int wxFont::GetStyle() const
 563 {
 564     wxCHECK_MSG( Ok(), 0, wxT("invalid font") );
 565
 566     return M_FONTDATA->m_style;
 567 }
 568
 569 int wxFont::GetWeight() const
 570 {
 571     wxCHECK_MSG( Ok(), 0, wxT("invalid font") );
 572
 573     return M_FONTDATA->m_weight;
 574 }
 575
 576 bool wxFont::GetUnderlined() const
 577 {
 578     wxCHECK_MSG( Ok(), false, wxT("invalid font") );
 579
 580     return M_FONTDATA->m_underlined;
 581 }
 582
 583 wxFontEncoding wxFont::GetEncoding() const
 584 {
 585     wxCHECK_MSG( Ok(), wxFONTENCODING_DEFAULT, wxT("invalid font") );
 586
 587     // m_encoding is unused in wxGTK2, return encoding that the user set.
 588     return M_FONTDATA->m_encoding;
 589 }
 590
 591 bool wxFont::GetNoAntiAliasing() const
 592 {
 593     wxCHECK_MSG( Ok(), wxFONTENCODING_DEFAULT, wxT("invalid font") );
 594
 595     return M_FONTDATA->m_noAA;
 596 }
 597
 598 const wxNativeFontInfo *wxFont::GetNativeFontInfo() const
 599 {
 600     wxCHECK_MSG( Ok(), (wxNativeFontInfo *)NULL, wxT("invalid font") );
 601
 602     if ( !M_FONTDATA->HasNativeFont() )
 603     {
 604         // NB: this call has important side-effect: it not only finds
 605         //     GdkFont representation, it also initializes m_nativeFontInfo
 606         //     by calling its SetXFontName method
 607         GetInternalFont();
 608     }
 609
 610     return &(M_FONTDATA->m_nativeFontInfo);
 611 }
 612
 613 bool wxFont::IsFixedWidth() const
 614 {
 615     wxCHECK_MSG( Ok(), false, wxT("invalid font") );
 616
 617     if ( M_FONTDATA->HasNativeFont() )
 618     {
 619         // the monospace fonts are supposed to have "M" in the spacing field
 620         wxString spacing = M_FONTDATA->
 621                             m_nativeFontInfo.GetXFontComponent(wxXLFD_SPACING);
 622
 623         return spacing.Upper() == _T('M');
 624     }
 625
 626     return wxFontBase::IsFixedWidth();
 627 }
 628
 629 // ----------------------------------------------------------------------------
 630 // change font attributes
 631 // ----------------------------------------------------------------------------
 632
 633 void wxFont::SetPointSize(int pointSize)
 634 {
 635     Unshare();
 636
 637     M_FONTDATA->SetPointSize(pointSize);
 638 }
 639
 640 void wxFont::SetFamily(int family)
 641 {
 642     Unshare();
 643
 644     M_FONTDATA->SetFamily(family);
 645 }
 646
 647 void wxFont::SetStyle(int style)
 648 {
 649     Unshare();
 650
 651     M_FONTDATA->SetStyle(style);
 652 }
 653
 654 void wxFont::SetWeight(int weight)
 655 {
 656     Unshare();
 657
 658     M_FONTDATA->SetWeight(weight);
 659 }
 660
 661 bool wxFont::SetFaceName(const wxString& faceName)
 662 {
 663     Unshare();
 664
 665     return M_FONTDATA->SetFaceName(faceName) &&
 666            wxFontBase::SetFaceName(faceName);
 667 }
 668
 669 void wxFont::SetUnderlined(bool underlined)
 670 {
 671     Unshare();
 672
 673     M_FONTDATA->SetUnderlined(underlined);
 674 }
 675
 676 void wxFont::SetEncoding(wxFontEncoding encoding)
 677 {
 678     Unshare();
 679
 680     M_FONTDATA->SetEncoding(encoding);
 681 }
 682
 683 void wxFont::DoSetNativeFontInfo( const wxNativeFontInfo& info )
 684 {
 685     Unshare();
 686
 687     M_FONTDATA->SetNativeFontInfo( info );
 688 }
 689
 690 void wxFont::SetNoAntiAliasing( bool no )
 691 {
 692     Unshare();
 693
 694     M_FONTDATA->SetNoAntiAliasing( no );
 695 }
 696
 697 // ----------------------------------------------------------------------------
 698 // get internal representation of font
 699 // ----------------------------------------------------------------------------
 700
 701 static GdkFont *g_systemDefaultGuiFont = (GdkFont*) NULL;
 702
 703 // this is also used from tbargtk.cpp and tooltip.cpp, hence extern
 704 extern GdkFont *GtkGetDefaultGuiFont()
 705 {
 706     if (!g_systemDefaultGuiFont)
 707     {
 708         GtkWidget *widget = gtk_button_new();
 709         GtkStyle *def = gtk_rc_get_style( widget );
 710         if (def)
 711         {
 712             g_systemDefaultGuiFont = gdk_font_ref( def->font );
 713         }
 714         else
 715         {
 716             def = gtk_widget_get_default_style();
 717             if (def)
 718                 g_systemDefaultGuiFont = gdk_font_ref( def->font );
 719         }
 720         gtk_widget_destroy( widget );
 721     }
 722     else
 723     {
 724         // already have it, but ref it once more before returning
 725         gdk_font_ref(g_systemDefaultGuiFont);
 726     }
 727
 728     return g_systemDefaultGuiFont;
 729 }
 730
 731 GdkFont *wxFont::GetInternalFont( float scale ) const
 732 {
 733     GdkFont *font = (GdkFont *) NULL;
 734
 735     wxCHECK_MSG( Ok(), font, wxT("invalid font") );
 736
 737     long int_scale = long(scale * 100.0 + 0.5); // key for fontlist
 738     int point_scale = (int)((M_FONTDATA->m_pointSize * 10 * int_scale) / 100);
 739
 740     wxScaledFontList& list = M_FONTDATA->m_scaled_xfonts;
 741     wxScaledFontList::iterator i = list.find(int_scale);
 742     if ( i != list.end() )
 743     {
 744         font = i->second;
 745     }
 746     else // we don't have this font in this size yet
 747     {
 748         if (*this == wxSystemSettings::GetFont( wxSYS_DEFAULT_GUI_FONT))
 749         {
 750             font = GtkGetDefaultGuiFont();
 751         }
 752
 753         if ( !font )
 754         {
 755             // do we have the XLFD?
 756             if ( int_scale == 100 && M_FONTDATA->HasNativeFont() )
 757             {
 758                 font = wxLoadFont(M_FONTDATA->m_nativeFontInfo.GetXFontName());
 759             }
 760
 761             // no XLFD of no exact match - try the approximate one now
 762             if ( !font )
 763             {
 764                 wxString xfontname;
 765                 font = wxLoadQueryNearestFont( point_scale,
 766                                                M_FONTDATA->m_family,
 767                                                M_FONTDATA->m_style,
 768                                                M_FONTDATA->m_weight,
 769                                                M_FONTDATA->m_underlined,
 770                                                M_FONTDATA->m_faceName,
 771                                                M_FONTDATA->m_encoding,
 772                                                &xfontname);
 773                 // NB: wxFont::GetNativeFontInfo relies on this
 774                 //     side-effect of GetInternalFont
 775                 if ( int_scale == 100 )
 776                     M_FONTDATA->m_nativeFontInfo.SetXFontName(xfontname);
 777             }
 778         }
 779
 780         if ( font )
 781         {
 782             list[int_scale] = font;
 783         }
 784     }
 785
 786     // it's quite useless to make it a wxCHECK because we're going to crash
 787     // anyhow...
 788     wxASSERT_MSG( font, wxT("could not load any font?") );
 789
 790     return font;
 791 }