fontutil.cpp

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        wxStringTokenizer tokenizer(*xFontName, _T("-"), wxTOKEN_RET_DELIMS);
        wxString newFontName;

        for(int i = 0; i < 8; i++)
          newFontName += tokenizer.NextToken();

        (void) tokenizer.NextToken();

        newFontName += wxString::Format(wxT("%d-"), pointSize);

        while(tokenizer.HasMoreTokens())
          newFontName += tokenizer.GetNextToken();

        font = wxLoadFont(newFontName);

        if(font)
          *xFontName = newFontName;
    }

    if ( !font )
    {
        // search up and down by stepsize 10
        int max_size = pointSize + 20 * (1 + (pointSize/180));
        int min_size = pointSize - 20 * (1 + (pointSize/180));

        int i, round; // counters

        // first round: search for equal, then for smaller and for larger size with the given weight and style
        int testweight = weight;
        int teststyle = style;

        for ( round = 0; round < 3; round++ )
        {
            // second round: use normal weight
            if ( round == 1 )
            {
                if ( testweight != wxNORMAL )
                {
                    testweight = wxNORMAL;
                }
                else
                {
                    ++round; // fall through to third round
                }
            }

            // third round: ... and use normal style
            if ( round == 2 )
            {
                if ( teststyle != wxNORMAL )
                {
                    teststyle = wxNORMAL;
                }
                else
                {
                    break;
                }
            }
            // Search for equal or smaller size (approx.)
            for ( i = pointSize; !font && i >= 10 && i >= min_size; i -= 10 )
            {
                font = wxLoadQueryFont(i, family, teststyle, testweight, underlined,
                                   facename, info.xregistry, info.xencoding,
                                   xFontName);
            }

            // Search for larger size (approx.)
            for ( i = pointSize + 10; !font && i <= max_size; i += 10 )
            {
                font = wxLoadQueryFont(i, family, teststyle, testweight, underlined,
                                   facename, info.xregistry, info.xencoding,
                                   xFontName);
            }
        }

        // Try default family
        if ( !font && family != wxDEFAULT )
        {
            font = wxLoadQueryFont(pointSize, wxDEFAULT, style, weight,
                                   underlined, facename,
                                   info.xregistry, info.xencoding,
                                   xFontName );
        }

        // ignore size, family, style and weight but try to find font with the
        // given facename and encoding
        if ( !font )
        {
            font = wxLoadQueryFont(120, wxDEFAULT, wxNORMAL, wxNORMAL,
                                   underlined, facename,
                                   info.xregistry, info.xencoding,
                                   xFontName);

            // ignore family as well
            if ( !font )
            {
                font = wxLoadQueryFont(120, wxDEFAULT, wxNORMAL, wxNORMAL,
                                       underlined, wxEmptyString,
                                       info.xregistry, info.xencoding,
                                       xFontName);

                // if it still failed, try to get the font of any size but
                // with the requested encoding: this can happen if the
                // encoding is only available in one size which happens to be
                // different from 120
                if ( !font )
                {
                    font = wxLoadQueryFont(-1, wxDEFAULT, wxNORMAL, wxNORMAL,
                                           FALSE, wxEmptyString,
                                           info.xregistry, info.xencoding,
                                           xFontName);

                    // this should never happen as we had tested for it in the
                    // very beginning, but if it does, do return something non
                    // NULL or we'd crash in wxFont code
                    if ( !font )
                    {
                        wxFAIL_MSG( _T("this encoding should be available!") );

                        font = wxLoadQueryFont(-1,
                                               wxDEFAULT, wxNORMAL, wxNORMAL,
                                               FALSE, wxEmptyString,
                                               _T("*"), _T("*"),
                                               xFontName);
                    }
                }
            }
        }
    }

    return font;
}

// ----------------------------------------------------------------------------
// private functions
// ----------------------------------------------------------------------------

// returns TRUE if there are any fonts matching this font spec
static bool wxTestFontSpec(const wxString& fontspec)
{
    // some X servers will fail to load this font because there are too many
    // matches so we must test explicitly for this
    if ( fontspec == _T("-*-*-*-*-*-*-*-*-*-*-*-*-*-*") )
    {
        return TRUE;
    }

    wxNativeFont test = (wxNativeFont) g_fontHash->Get( fontspec );
    if (test)
    {
        return TRUE;
    }

    test = wxLoadFont(fontspec);
    g_fontHash->Put( fontspec, (wxObject*) test );

    if ( test )
    {
        wxFreeFont(test);

        return TRUE;
    }
    else
    {
        return FALSE;
    }
}

static wxNativeFont wxLoadQueryFont(int pointSize,
                                    int family,
                                    int style,
                                    int weight,
                                    bool WXUNUSED(underlined),
                                    const wxString& facename,
                                    const wxString& xregistry,
                                    const wxString& xencoding,
                                    wxString* xFontName)
{
    wxString xfamily;
    switch (family)
    {
        case wxDECORATIVE: xfamily = wxT("lucida"); break;
        case wxROMAN:      xfamily = wxT("times");  break;
        case wxMODERN:     xfamily = wxT("courier"); break;
        case wxSWISS:      xfamily = wxT("helvetica"); break;
        case wxTELETYPE:   xfamily = wxT("lucidatypewriter"); break;
        case wxSCRIPT:     xfamily = wxT("utopia"); break;
        default:           xfamily = wxT("*");
    }
#if wxUSE_NANOX
    int xweight;
    switch (weight)
    {
         case wxBOLD:
             {
                 xweight = MWLF_WEIGHT_BOLD;
                 break;
             }
        case wxLIGHT:
             {
                 xweight = MWLF_WEIGHT_LIGHT;
                 break;
             }
         case wxNORMAL:
             {
                 xweight = MWLF_WEIGHT_NORMAL;
                 break;
             }

     default:
             {
                 xweight = MWLF_WEIGHT_DEFAULT;
                 break;
             }
    }
    GR_SCREEN_INFO screenInfo;
    GrGetScreenInfo(& screenInfo);

    int yPixelsPerCM = screenInfo.ydpcm;

    // A point is 1/72 of an inch.
    // An inch is 2.541 cm.
    // So pixelHeight = (pointSize / 72) (inches) * 2.541 (for cm) * yPixelsPerCM (for pixels)
    // In fact pointSize is 10 * the normal point size so
    // divide by 10.

    int pixelHeight = (int) ( (((float)pointSize) / 720.0) * 2.541 * (float) yPixelsPerCM) ;

    // An alternative: assume that the screen is 72 dpi.
    //int pixelHeight = (int) (((float)pointSize / 720.0) * 72.0) ;
    //int pixelHeight = (int) ((float)pointSize / 10.0) ;

    GR_LOGFONT logFont;
    logFont.lfHeight = pixelHeight;
    logFont.lfWidth = 0;
    logFont.lfEscapement = 0;
    logFont.lfOrientation = 0;
    logFont.lfWeight = xweight;
    logFont.lfItalic = (style == wxNORMAL ? 0 : 1) ;
    logFont.lfUnderline = 0;
    logFont.lfStrikeOut = 0;
    logFont.lfCharSet = MWLF_CHARSET_DEFAULT; // TODO: select appropriate one
    logFont.lfOutPrecision = MWLF_TYPE_DEFAULT;
    logFont.lfClipPrecision = 0; // Not used
    logFont.lfRoman = (family == wxROMAN ? 1 : 0) ;
    logFont.lfSerif = (family == wxSWISS ? 0 : 1) ;
    logFont.lfSansSerif = !logFont.lfSerif ;
    logFont.lfModern = (family == wxMODERN ? 1 : 0) ;
    logFont.lfProportional = (family == wxTELETYPE ? 0 : 1) ;
    logFont.lfOblique = 0;
    logFont.lfSmallCaps = 0;
    logFont.lfPitch = 0; // 0 = default
    strcpy(logFont.lfFaceName, facename.c_str());

    XFontStruct* fontInfo = (XFontStruct*) malloc(sizeof(XFontStruct));
    fontInfo->fid = GrCreateFont((GR_CHAR*) facename.c_str(), pixelHeight, & logFont);
    GrGetFontInfo(fontInfo->fid, & fontInfo->info);
    return (wxNativeFont) fontInfo;

#else
    wxString fontSpec;
    if (!facename.IsEmpty())
    {
        fontSpec.Printf(wxT("-*-%s-*-*-normal-*-*-*-*-*-*-*-*-*"),
                        facename.c_str());

        if ( wxTestFontSpec(fontSpec) )
        {
            xfamily = facename;
        }
        //else: no such family, use default one instead
    }

    wxString xstyle;
    switch (style)
    {
        case wxSLANT:
            fontSpec.Printf(wxT("-*-%s-*-o-*-*-*-*-*-*-*-*-*-*"),
                    xfamily.c_str());
            if ( wxTestFontSpec(fontSpec) )
            {
                xstyle = wxT("o");
                break;
            }
            // fall through - try wxITALIC now

        case wxITALIC:
            fontSpec.Printf(wxT("-*-%s-*-i-*-*-*-*-*-*-*-*-*-*"),
                    xfamily.c_str());
            if ( wxTestFontSpec(fontSpec) )
            {
                xstyle = wxT("i");
            }
            else if ( style == wxITALIC ) // and not wxSLANT
            {
                // try wxSLANT
                fontSpec.Printf(wxT("-*-%s-*-o-*-*-*-*-*-*-*-*-*-*"),
                        xfamily.c_str());
                if ( wxTestFontSpec(fontSpec) )
                {
                    xstyle = wxT("o");
                }
                else
                {
                    // no italic, no slant - leave default
                    xstyle = wxT("*");
                }
            }
            break;

        default:
            wxFAIL_MSG(_T("unknown font style"));
            // fall back to normal

        case wxNORMAL:
            xstyle = wxT("r");
            break;
    }

    wxString xweight;
    switch (weight)
    {
         case wxBOLD:
             {
                  fontSpec.Printf(wxT("-*-%s-bold-*-*-*-*-*-*-*-*-*-*-*"),
                         xfamily.c_str());
                  if ( wxTestFontSpec(fontSpec) )
                  {
                       xweight = wxT("bold");
                       break;
                  }
                  fontSpec.Printf(wxT("-*-%s-heavy-*-*-*-*-*-*-*-*-*-*-*"),
                         xfamily.c_str());
                  if ( wxTestFontSpec(fontSpec) )
                  {
                       xweight = wxT("heavy");
                       break;
                  }
                  fontSpec.Printf(wxT("-*-%s-extrabold-*-*-*-*-*-*-*-*-*-*-*"),
                         xfamily.c_str());
                  if ( wxTestFontSpec(fontSpec) )
                  {
                      xweight = wxT("extrabold");
                      break;
                  }
                  fontSpec.Printf(wxT("-*-%s-demibold-*-*-*-*-*-*-*-*-*-*-*"),
                         xfamily.c_str());
                  if ( wxTestFontSpec(fontSpec) )
                  {
                      xweight = wxT("demibold");
                      break;
                  }
                  fontSpec.Printf(wxT("-*-%s-black-*-*-*-*-*-*-*-*-*-*-*"),
                         xfamily.c_str());
                  if ( wxTestFontSpec(fontSpec) )
                  {
                      xweight = wxT("black");
                      break;
                  }
                  fontSpec.Printf(wxT("-*-%s-ultrablack-*-*-*-*-*-*-*-*-*-*-*"),
                         xfamily.c_str());
                  if ( wxTestFontSpec(fontSpec) )
                  {
                      xweight = wxT("ultrablack");
                      break;
                  }
              }
              break;
        case wxLIGHT:
             {
                  fontSpec.Printf(wxT("-*-%s-light-*-*-*-*-*-*-*-*-*-*-*"),
                         xfamily.c_str());
                  if ( wxTestFontSpec(fontSpec) )
                  {
                       xweight = wxT("light");
                       break;
                  }
                  fontSpec.Printf(wxT("-*-%s-thin-*-*-*-*-*-*-*-*-*-*-*"),
                         xfamily.c_str());
                  if ( wxTestFontSpec(fontSpec) )
                  {
                       xweight = wxT("thin");
                       break;
                  }
             }
             break;
         case wxNORMAL:
             {
                  fontSpec.Printf(wxT("-*-%s-medium-*-*-*-*-*-*-*-*-*-*-*"),
                         xfamily.c_str());
                  if ( wxTestFontSpec(fontSpec) )
                  {
                       xweight = wxT("medium");
                       break;
                  }
                  fontSpec.Printf(wxT("-*-%s-normal-*-*-*-*-*-*-*-*-*-*-*"),
                         xfamily.c_str());
                  if ( wxTestFontSpec(fontSpec) )
                  {
                       xweight = wxT("normal");
                       break;
                  }
                  fontSpec.Printf(wxT("-*-%s-regular-*-*-*-*-*-*-*-*-*-*-*"),
                         xfamily.c_str());
                  if ( wxTestFontSpec(fontSpec) )
                  {
                      xweight = wxT("regular");
                      break;
                  }
                  xweight = wxT("*");
              }
              break;
        default:           xweight = wxT("*"); break;
    }

    // if pointSize is -1, don't specify any
    wxString sizeSpec;
    if ( pointSize == -1 )
    {
        sizeSpec = _T('*');
    }
    else
    {
        sizeSpec.Printf(_T("%d"), pointSize);
    }

    // construct the X font spec from our data
    fontSpec.Printf(wxT("-*-%s-%s-%s-normal-*-*-%s-*-*-*-*-%s-%s"),
                    xfamily.c_str(), xweight.c_str(), xstyle.c_str(),
                    sizeSpec.c_str(), xregistry.c_str(), xencoding.c_str());

    if( xFontName )
        *xFontName = fontSpec;

    return wxLoadFont(fontSpec);
#endif
    // wxUSE_NANOX
}

// ----------------------------------------------------------------------------
// wxFontModule
// ----------------------------------------------------------------------------

class wxFontModule : public wxModule
{
public:
    bool OnInit();
    void OnExit();

private:
    DECLARE_DYNAMIC_CLASS(wxFontModule)
};

IMPLEMENT_DYNAMIC_CLASS(wxFontModule, wxModule)

bool wxFontModule::OnInit()
{
    g_fontHash = new wxHashTable( wxKEY_STRING );

    return TRUE;
}

void wxFontModule::OnExit()
{
    delete g_fontHash;

    g_fontHash = (wxHashTable *)NULL;
}

#endif // GTK 2.0/1.x