src/unix/fontutil.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        unix/fontutil.cpp
   3 // Purpose:     Font helper functions for X11 (GDK/X)
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     05.11.99
   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 "fontutil.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 #endif // PCH
  33
  34 #ifdef __X__
  35     #ifdef __VMS__
  36         #pragma message disable nosimpint
  37     #endif
  38
  39     #include <X11/Xlib.h>
  40
  41     #ifdef __VMS__
  42         #pragma message enable nosimpint
  43     #endif
  44
  45     #include "wx/utils.h"       // for wxGetDisplay()
  46 #elif defined(__WXGTK__)
  47     // we have to declare struct tm to avoid problems with first forward
  48     // declaring it in C code (glib.h included from gdk.h does it) and then
  49     // defining it when time.h is included from the headers below - this is
  50     // known not to work at least with Sun CC 6.01
  51     #include <time.h>
  52
  53     #include <gdk/gdk.h>
  54 #endif
  55
  56 #include "wx/fontutil.h"
  57 #include "wx/fontmap.h"
  58 #include "wx/tokenzr.h"
  59 #include "wx/hash.h"
  60 #include "wx/module.h"
  61
  62 // ----------------------------------------------------------------------------
  63 // private data
  64 // ----------------------------------------------------------------------------
  65
  66 static wxHashTable *g_fontHash = (wxHashTable*) NULL;
  67
  68 // ----------------------------------------------------------------------------
  69 // private functions
  70 // ----------------------------------------------------------------------------
  71
  72 // define the functions to create and destroy native fonts for this toolkit
  73 #ifdef __X__
  74     static inline wxNativeFont wxLoadFont(const wxString& fontSpec)
  75     {
  76         return XLoadQueryFont((Display *)wxGetDisplay(), fontSpec);
  77     }
  78
  79     static inline void wxFreeFont(wxNativeFont font)
  80     {
  81         XFreeFont((Display *)wxGetDisplay(), (XFontStruct *)font);
  82     }
  83 #elif defined(__WXGTK__)
  84     static inline wxNativeFont wxLoadFont(const wxString& fontSpec)
  85     {
  86        return gdk_font_load( wxConvertWX2MB(fontSpec) );
  87     }
  88
  89     static inline void wxFreeFont(wxNativeFont font)
  90     {
  91         gdk_font_unref(font);
  92     }
  93 #else
  94     #error "Unknown GUI toolkit"
  95 #endif
  96
  97 static bool wxTestFontSpec(const wxString& fontspec);
  98
  99 static wxNativeFont wxLoadQueryFont(int pointSize,
 100                                     int family,
 101                                     int style,
 102                                     int weight,
 103                                     bool underlined,
 104                                     const wxString& facename,
 105                                     const wxString& xregistry,
 106                                     const wxString& xencoding,
 107                                     wxString* xFontName);
 108
 109 // ============================================================================
 110 // implementation
 111 // ============================================================================
 112
 113 // ----------------------------------------------------------------------------
 114 // wxNativeEncodingInfo
 115 // ----------------------------------------------------------------------------
 116
 117 // convert to/from the string representation: format is
 118 //      encodingid;registry;encoding[;facename]
 119 bool wxNativeEncodingInfo::FromString(const wxString& s)
 120 {
 121     // use ";", not "-" because it may be part of encoding name
 122     wxStringTokenizer tokenizer(s, _T(";"));
 123
 124     wxString encid = tokenizer.GetNextToken();
 125     long enc;
 126     if ( !encid.ToLong(&enc) )
 127         return FALSE;
 128     encoding = (wxFontEncoding)enc;
 129
 130     xregistry = tokenizer.GetNextToken();
 131     if ( !xregistry )
 132         return FALSE;
 133
 134     xencoding = tokenizer.GetNextToken();
 135     if ( !xencoding )
 136         return FALSE;
 137
 138     // ok even if empty
 139     facename = tokenizer.GetNextToken();
 140
 141     return TRUE;
 142 }
 143
 144 wxString wxNativeEncodingInfo::ToString() const
 145 {
 146     wxString s;
 147     s << (long)encoding << _T(';') << xregistry << _T(';') << xencoding;
 148     if ( !!facename )
 149     {
 150         s << _T(';') << facename;
 151     }
 152
 153     return s;
 154 }
 155
 156 // ----------------------------------------------------------------------------
 157 // common functions
 158 // ----------------------------------------------------------------------------
 159
 160 bool wxGetNativeFontEncoding(wxFontEncoding encoding,
 161                              wxNativeEncodingInfo *info)
 162 {
 163     wxCHECK_MSG( info, FALSE, _T("bad pointer in wxGetNativeFontEncoding") );
 164
 165     if ( encoding == wxFONTENCODING_DEFAULT )
 166     {
 167         encoding = wxFont::GetDefaultEncoding();
 168     }
 169
 170     switch ( encoding )
 171     {
 172         case wxFONTENCODING_ISO8859_1:
 173         case wxFONTENCODING_ISO8859_2:
 174         case wxFONTENCODING_ISO8859_3:
 175         case wxFONTENCODING_ISO8859_4:
 176         case wxFONTENCODING_ISO8859_5:
 177         case wxFONTENCODING_ISO8859_6:
 178         case wxFONTENCODING_ISO8859_7:
 179         case wxFONTENCODING_ISO8859_8:
 180         case wxFONTENCODING_ISO8859_9:
 181         case wxFONTENCODING_ISO8859_10:
 182         case wxFONTENCODING_ISO8859_11:
 183         case wxFONTENCODING_ISO8859_12:
 184         case wxFONTENCODING_ISO8859_13:
 185         case wxFONTENCODING_ISO8859_14:
 186         case wxFONTENCODING_ISO8859_15:
 187             {
 188                 int cp = encoding - wxFONTENCODING_ISO8859_1 + 1;
 189                 info->xregistry = wxT("iso8859");
 190                 info->xencoding.Printf(wxT("%d"), cp);
 191             }
 192             break;
 193
 194         case wxFONTENCODING_UTF8:
 195             info->xregistry = wxT("iso10646");
 196             info->xencoding = wxT("*");
 197             break;
 198
 199         case wxFONTENCODING_KOI8:
 200             info->xregistry = wxT("koi8");
 201
 202             // we don't make distinction between koi8-r, koi8-u and koi8-ru (so far)
 203             info->xencoding = wxT("*");
 204             break;
 205
 206         case wxFONTENCODING_CP1250:
 207         case wxFONTENCODING_CP1251:
 208         case wxFONTENCODING_CP1252:
 209         case wxFONTENCODING_CP1253:
 210         case wxFONTENCODING_CP1254:
 211         case wxFONTENCODING_CP1255:
 212         case wxFONTENCODING_CP1256:
 213         case wxFONTENCODING_CP1257:
 214             {
 215                 int cp = encoding - wxFONTENCODING_CP1250 + 1250;
 216                 info->xregistry = wxT("microsoft");
 217                 info->xencoding.Printf(wxT("cp%d"), cp);
 218             }
 219             break;
 220
 221         case wxFONTENCODING_SYSTEM:
 222             info->xregistry =
 223             info->xencoding = wxT("*");
 224             break;
 225
 226         default:
 227             // don't know how to translate this encoding into X fontspec
 228             return FALSE;
 229     }
 230
 231    info->encoding = encoding;
 232
 233     return TRUE;
 234 }
 235
 236 bool wxTestFontEncoding(const wxNativeEncodingInfo& info)
 237 {
 238     wxString fontspec;
 239     fontspec.Printf(_T("-*-%s-*-*-*-*-*-*-*-*-*-*-%s-%s"),
 240                     !info.facename ? _T("*") : info.facename.c_str(),
 241                     info.xregistry.c_str(),
 242                     info.xencoding.c_str());
 243
 244     return wxTestFontSpec(fontspec);
 245 }
 246
 247 // ----------------------------------------------------------------------------
 248 // X-specific functions
 249 // ----------------------------------------------------------------------------
 250
 251 wxNativeFont wxLoadQueryNearestFont(int pointSize,
 252                                     int family,
 253                                     int style,
 254                                     int weight,
 255                                     bool underlined,
 256                                     const wxString &facename,
 257                                     wxFontEncoding encoding,
 258                                     wxString* xFontName)
 259 {
 260     if ( encoding == wxFONTENCODING_DEFAULT )
 261     {
 262         encoding = wxFont::GetDefaultEncoding();
 263     }
 264
 265     // first determine the encoding - if the font doesn't exist at all in this
 266     // encoding, it's useless to do all other approximations (i.e. size,
 267     // family &c don't matter much)
 268     wxNativeEncodingInfo info;
 269     if ( encoding == wxFONTENCODING_SYSTEM )
 270     {
 271         // This will always work so we don't test to save time
 272         wxGetNativeFontEncoding(wxFONTENCODING_SYSTEM, &info);
 273     }
 274     else
 275     {
 276         if ( !wxGetNativeFontEncoding(encoding, &info) ||
 277              !wxTestFontEncoding(info) )
 278         {
 279 #if wxUSE_FONTMAP
 280             if ( !wxTheFontMapper->GetAltForEncoding(encoding, &info) )
 281 #endif // wxUSE_FONTMAP
 282             {
 283                 // unspported encoding - replace it with the default
 284                 //
 285                 // NB: we can't just return 0 from here because wxGTK code doesn't
 286                 //     check for it (i.e. it supposes that we'll always succeed),
 287                 //     so it would provoke a crash
 288                 wxGetNativeFontEncoding(wxFONTENCODING_SYSTEM, &info);
 289             }
 290         }
 291     }
 292
 293     // OK, we have the correct xregistry/xencoding in info structure
 294     wxNativeFont font = 0;
 295
 296     // if we already have the X font name, try to use it
 297     if( xFontName && !xFontName->IsEmpty() )
 298     {
 299         //
 300         //  Make sure point size is correct for scale factor.
 301         //
 302         wxStringTokenizer tokenizer(*xFontName, _T("-"), wxTOKEN_RET_DELIMS);
 303         wxString newFontName;
 304
 305         for(int i = 0; i < 8; i++)
 306           newFontName += tokenizer.NextToken();
 307
 308         (void) tokenizer.NextToken();
 309
 310         newFontName += wxString::Format("%d-", pointSize);
 311
 312         while(tokenizer.HasMoreTokens())
 313           newFontName += tokenizer.GetNextToken();
 314
 315         font = wxLoadFont(newFontName);
 316
 317         if(font)
 318           *xFontName = newFontName;
 319     }
 320
 321     // try to load exactly the font requested first
 322     if( !font )
 323     {
 324         font = wxLoadQueryFont( pointSize, family, style, weight,
 325                                 underlined, facename,
 326                                 info.xregistry, info.xencoding,
 327                                 xFontName );
 328     }
 329
 330     if ( !font )
 331     {
 332         // search up and down by stepsize 10
 333         int max_size = pointSize + 20 * (1 + (pointSize/180));
 334         int min_size = pointSize - 20 * (1 + (pointSize/180));
 335
 336         int i;
 337
 338         // Search for smaller size (approx.)
 339         for ( i = pointSize - 10; !font && i >= 10 && i >= min_size; i -= 10 )
 340         {
 341             font = wxLoadQueryFont(i, family, style, weight, underlined,
 342                                    facename, info.xregistry, info.xencoding,
 343                                    xFontName);
 344         }
 345
 346         // Search for larger size (approx.)
 347         for ( i = pointSize + 10; !font && i <= max_size; i += 10 )
 348         {
 349             font = wxLoadQueryFont(i, family, style, weight, underlined,
 350                                    facename, info.xregistry, info.xencoding,
 351                                    xFontName);
 352         }
 353
 354         // Try default family
 355         if ( !font && family != wxDEFAULT )
 356         {
 357             font = wxLoadQueryFont(pointSize, wxDEFAULT, style, weight,
 358                                    underlined, facename,
 359                                    info.xregistry, info.xencoding,
 360                                    xFontName );
 361         }
 362
 363         // ignore size, family, style and weight but try to find font with the
 364         // given facename and encoding
 365         if ( !font )
 366         {
 367             font = wxLoadQueryFont(120, wxDEFAULT, wxNORMAL, wxNORMAL,
 368                                    underlined, facename,
 369                                    info.xregistry, info.xencoding,
 370                                    xFontName);
 371
 372             // ignore family as well
 373             if ( !font )
 374             {
 375                 font = wxLoadQueryFont(120, wxDEFAULT, wxNORMAL, wxNORMAL,
 376                                        underlined, wxEmptyString,
 377                                        info.xregistry, info.xencoding,
 378                                        xFontName);
 379
 380                 // if it still failed, try to get the font of any size but
 381                 // with the requested encoding: this can happen if the
 382                 // encoding is only available in one size which happens to be
 383                 // different from 120
 384                 if ( !font )
 385                 {
 386                     font = wxLoadQueryFont(-1, wxDEFAULT, wxNORMAL, wxNORMAL,
 387                                            FALSE, wxEmptyString,
 388                                            info.xregistry, info.xencoding,
 389                                            xFontName);
 390
 391                     // this should never happen as we had tested for it in the
 392                     // very beginning, but if it does, do return something non
 393                     // NULL or we'd crash in wxFont code
 394                     if ( !font )
 395                     {
 396                         wxFAIL_MSG( _T("this encoding should be available!") );
 397
 398                         font = wxLoadQueryFont(-1,
 399                                                wxDEFAULT, wxNORMAL, wxNORMAL,
 400                                                FALSE, wxEmptyString,
 401                                                _T("*"), _T("*"),
 402                                                xFontName);
 403                     }
 404                 }
 405             }
 406         }
 407     }
 408
 409     return font;
 410 }
 411
 412 // ----------------------------------------------------------------------------
 413 // private functions
 414 // ----------------------------------------------------------------------------
 415
 416 // returns TRUE if there are any fonts matching this font spec
 417 static bool wxTestFontSpec(const wxString& fontspec)
 418 {
 419     // some X servers will fail to load this font because there are too many
 420     // matches so we must test explicitly for this
 421     if ( fontspec == _T("-*-*-*-*-*-*-*-*-*-*-*-*-*-*") )
 422     {
 423         return TRUE;
 424     }
 425
 426     wxNativeFont test = (wxNativeFont) g_fontHash->Get( fontspec );
 427     if (test)
 428     {
 429         return TRUE;
 430     }
 431
 432     test = wxLoadFont(fontspec);
 433     g_fontHash->Put( fontspec, (wxObject*) test );
 434
 435     if ( test )
 436     {
 437         wxFreeFont(test);
 438
 439         return TRUE;
 440     }
 441     else
 442     {
 443         return FALSE;
 444     }
 445 }
 446
 447 static wxNativeFont wxLoadQueryFont(int pointSize,
 448                                     int family,
 449                                     int style,
 450                                     int weight,
 451                                     bool WXUNUSED(underlined),
 452                                     const wxString& facename,
 453                                     const wxString& xregistry,
 454                                     const wxString& xencoding,
 455                                     wxString* xFontName)
 456 {
 457     wxString xfamily;
 458     switch (family)
 459     {
 460         case wxDECORATIVE: xfamily = wxT("lucida"); break;
 461         case wxROMAN:      xfamily = wxT("times");  break;
 462         case wxMODERN:     xfamily = wxT("courier"); break;
 463         case wxSWISS:      xfamily = wxT("helvetica"); break;
 464         case wxTELETYPE:   xfamily = wxT("lucidatypewriter"); break;
 465         case wxSCRIPT:     xfamily = wxT("utopia"); break;
 466         default:           xfamily = wxT("*");
 467     }
 468
 469     wxString fontSpec;
 470     if (!facename.IsEmpty())
 471     {
 472         fontSpec.Printf(wxT("-*-%s-*-*-normal-*-*-*-*-*-*-*-*-*"),
 473                         facename.c_str());
 474
 475         if ( wxTestFontSpec(fontSpec) )
 476         {
 477             xfamily = facename;
 478         }
 479         //else: no such family, use default one instead
 480     }
 481
 482     wxString xstyle;
 483     switch (style)
 484     {
 485         case wxSLANT:
 486             fontSpec.Printf(wxT("-*-%s-*-o-*-*-*-*-*-*-*-*-*-*"),
 487                     xfamily.c_str());
 488             if ( wxTestFontSpec(fontSpec) )
 489             {
 490                 xstyle = wxT("o");
 491                 break;
 492             }
 493             // fall through - try wxITALIC now
 494
 495         case wxITALIC:
 496             fontSpec.Printf(wxT("-*-%s-*-i-*-*-*-*-*-*-*-*-*-*"),
 497                     xfamily.c_str());
 498             if ( wxTestFontSpec(fontSpec) )
 499             {
 500                 xstyle = wxT("i");
 501             }
 502             else if ( style == wxITALIC ) // and not wxSLANT
 503             {
 504                 // try wxSLANT
 505                 fontSpec.Printf(wxT("-*-%s-*-o-*-*-*-*-*-*-*-*-*-*"),
 506                         xfamily.c_str());
 507                 if ( wxTestFontSpec(fontSpec) )
 508                 {
 509                     xstyle = wxT("o");
 510                 }
 511                 else
 512                 {
 513                     // no italic, no slant - leave default
 514                     xstyle = wxT("*");
 515                 }
 516             }
 517             break;
 518
 519         default:
 520             wxFAIL_MSG(_T("unknown font style"));
 521             // fall back to normal
 522
 523         case wxNORMAL:
 524             xstyle = wxT("r");
 525             break;
 526     }
 527
 528     wxString xweight;
 529     switch (weight)
 530     {
 531          case wxBOLD:
 532              {
 533                   fontSpec.Printf(wxT("-*-%s-bold-*-*-*-*-*-*-*-*-*-*-*"),
 534                          xfamily.c_str());
 535                   if ( wxTestFontSpec(fontSpec) )
 536                   {
 537                        xweight = wxT("bold");
 538                        break;
 539                   }
 540                   fontSpec.Printf(wxT("-*-%s-heavy-*-*-*-*-*-*-*-*-*-*-*"),
 541                          xfamily.c_str());
 542                   if ( wxTestFontSpec(fontSpec) )
 543                   {
 544                        xweight = wxT("heavy");
 545                        break;
 546                   }
 547                   fontSpec.Printf(wxT("-*-%s-extrabold-*-*-*-*-*-*-*-*-*-*-*"),
 548                          xfamily.c_str());
 549                   if ( wxTestFontSpec(fontSpec) )
 550                   {
 551                       xweight = wxT("extrabold");
 552                       break;
 553                   }
 554                   fontSpec.Printf(wxT("-*-%s-demibold-*-*-*-*-*-*-*-*-*-*-*"),
 555                          xfamily.c_str());
 556                   if ( wxTestFontSpec(fontSpec) )
 557                   {
 558                       xweight = wxT("demibold");
 559                       break;
 560                   }
 561                   fontSpec.Printf(wxT("-*-%s-black-*-*-*-*-*-*-*-*-*-*-*"),
 562                          xfamily.c_str());
 563                   if ( wxTestFontSpec(fontSpec) )
 564                   {
 565                       xweight = wxT("black");
 566                       break;
 567                   }
 568                   fontSpec.Printf(wxT("-*-%s-ultrablack-*-*-*-*-*-*-*-*-*-*-*"),
 569                          xfamily.c_str());
 570                   if ( wxTestFontSpec(fontSpec) )
 571                   {
 572                       xweight = wxT("ultrablack");
 573                       break;
 574                   }
 575               }
 576               break;
 577         case wxLIGHT:
 578              {
 579                   fontSpec.Printf(wxT("-*-%s-light-*-*-*-*-*-*-*-*-*-*-*"),
 580                          xfamily.c_str());
 581                   if ( wxTestFontSpec(fontSpec) )
 582                   {
 583                        xweight = wxT("light");
 584                        break;
 585                   }
 586                   fontSpec.Printf(wxT("-*-%s-thin-*-*-*-*-*-*-*-*-*-*-*"),
 587                          xfamily.c_str());
 588                   if ( wxTestFontSpec(fontSpec) )
 589                   {
 590                        xweight = wxT("thin");
 591                        break;
 592                   }
 593              }
 594              break;
 595          case wxNORMAL:
 596              {
 597                   fontSpec.Printf(wxT("-*-%s-medium-*-*-*-*-*-*-*-*-*-*-*"),
 598                          xfamily.c_str());
 599                   if ( wxTestFontSpec(fontSpec) )
 600                   {
 601                        xweight = wxT("medium");
 602                        break;
 603                   }
 604                   fontSpec.Printf(wxT("-*-%s-normal-*-*-*-*-*-*-*-*-*-*-*"),
 605                          xfamily.c_str());
 606                   if ( wxTestFontSpec(fontSpec) )
 607                   {
 608                        xweight = wxT("normal");
 609                        break;
 610                   }
 611                   fontSpec.Printf(wxT("-*-%s-regular-*-*-*-*-*-*-*-*-*-*-*"),
 612                          xfamily.c_str());
 613                   if ( wxTestFontSpec(fontSpec) )
 614                   {
 615                       xweight = wxT("regular");
 616                       break;
 617                   }
 618                   xweight = wxT("*");
 619               }
 620               break;
 621         default:           xweight = wxT("*"); break;
 622     }
 623
 624     // if pointSize is -1, don't specify any
 625     wxString sizeSpec;
 626     if ( fontSpec == -1 )
 627     {
 628         sizeSpec = _T('*');
 629     }
 630     else
 631     {
 632         sizeSpec.Printf(_T("%d"), pointSize);
 633     }
 634
 635     // construct the X font spec from our data
 636     fontSpec.Printf(wxT("-*-%s-%s-%s-normal-*-*-%s-*-*-*-*-%s-%s"),
 637                     xfamily.c_str(), xweight.c_str(), xstyle.c_str(),
 638                     sizeSpec.c_str(), xregistry.c_str(), xencoding.c_str());
 639
 640     if( xFontName )
 641         *xFontName = fontSpec;
 642
 643     return wxLoadFont(fontSpec);
 644 }
 645
 646 // ----------------------------------------------------------------------------
 647 // wxFontModule
 648 // ----------------------------------------------------------------------------
 649
 650 class wxFontModule : public wxModule
 651 {
 652 public:
 653     bool OnInit();
 654     void OnExit();
 655
 656 private:
 657     DECLARE_DYNAMIC_CLASS(wxFontModule)
 658 };
 659
 660 IMPLEMENT_DYNAMIC_CLASS(wxFontModule, wxModule)
 661
 662 bool wxFontModule::OnInit()
 663 {
 664     g_fontHash = new wxHashTable( wxKEY_STRING );
 665
 666     return TRUE;
 667 }
 668
 669 void wxFontModule::OnExit()
 670 {
 671     delete g_fontHash;
 672
 673     g_fontHash = (wxHashTable *)NULL;
 674 }