src/mgl/fontutil.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/mgl/fontutil.cpp
   3 // Purpose:     Font helper functions for MGL
   4 // Author:      Vaclav Slavik
   5 // Created:     2001/04/29
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2001-2002 SciTech Software, Inc. (www.scitechsoft.com)
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 // For compilers that support precompilation, includes "wx.h".
  12 #include "wx/wxprec.h"
  13
  14 #ifdef __BORLANDC__
  15     #pragma hdrstop
  16 #endif
  17
  18 #include "wx/log.h"
  19 #include "wx/fontutil.h"
  20 #include "wx/encinfo.h"
  21 #include "wx/fontmap.h"
  22 #include "wx/tokenzr.h"
  23 #include "wx/hash.h"
  24
  25 #include "wx/listimpl.cpp"
  26 #include "wx/sysopt.h"
  27 #include "wx/mgl/private.h"
  28
  29 #include <mgraph.h>
  30
  31 // ============================================================================
  32 // implementation
  33 // ============================================================================
  34
  35 // ----------------------------------------------------------------------------
  36 // wxNativeEncodingInfo
  37 // ----------------------------------------------------------------------------
  38
  39 // convert to/from the string representation: format is
  40 //      encoding[;facename]
  41 bool wxNativeEncodingInfo::FromString(const wxString& s)
  42 {
  43     wxStringTokenizer tokenizer(s, _T(";"));
  44
  45     wxString encid = tokenizer.GetNextToken();
  46     long enc;
  47     if ( !encid.ToLong(&enc) )
  48         return false;
  49     encoding = (wxFontEncoding)enc;
  50
  51     // ok even if empty
  52     facename = tokenizer.GetNextToken();
  53
  54     return true;
  55 }
  56
  57 wxString wxNativeEncodingInfo::ToString() const
  58 {
  59     wxString s;
  60     s << (long)encoding;
  61     if ( !facename.empty() )
  62     {
  63         s << _T(';') << facename;
  64     }
  65
  66     return s;
  67 }
  68
  69 // ----------------------------------------------------------------------------
  70 // common functions
  71 // ----------------------------------------------------------------------------
  72
  73 bool wxGetNativeFontEncoding(wxFontEncoding encoding,
  74                              wxNativeEncodingInfo *info)
  75 {
  76     wxCHECK_MSG( info, false, _T("bad pointer in wxGetNativeFontEncoding") );
  77
  78     if ( encoding == wxFONTENCODING_DEFAULT )
  79     {
  80         encoding = wxFont::GetDefaultEncoding();
  81     }
  82
  83     switch ( encoding )
  84     {
  85         case wxFONTENCODING_ISO8859_1:
  86         case wxFONTENCODING_ISO8859_2:
  87         case wxFONTENCODING_ISO8859_3:
  88         case wxFONTENCODING_ISO8859_4:
  89         case wxFONTENCODING_ISO8859_5:
  90         case wxFONTENCODING_ISO8859_6:
  91         case wxFONTENCODING_ISO8859_7:
  92         case wxFONTENCODING_ISO8859_8:
  93         case wxFONTENCODING_ISO8859_9:
  94         case wxFONTENCODING_ISO8859_10:
  95         case wxFONTENCODING_ISO8859_11:
  96         case wxFONTENCODING_ISO8859_13:
  97         case wxFONTENCODING_ISO8859_14:
  98         case wxFONTENCODING_ISO8859_15:
  99             info->mglEncoding = MGL_ENCODING_ISO8859_1 +
 100                                 (encoding - wxFONTENCODING_ISO8859_1);
 101             break;
 102
 103         case wxFONTENCODING_KOI8:
 104             info->mglEncoding = MGL_ENCODING_KOI8;
 105             break;
 106
 107         case wxFONTENCODING_CP1250:
 108         case wxFONTENCODING_CP1251:
 109         case wxFONTENCODING_CP1252:
 110         case wxFONTENCODING_CP1253:
 111         case wxFONTENCODING_CP1254:
 112         case wxFONTENCODING_CP1255:
 113         case wxFONTENCODING_CP1256:
 114         case wxFONTENCODING_CP1257:
 115             info->mglEncoding = MGL_ENCODING_CP1250 +
 116                                 (encoding - wxFONTENCODING_CP1250);
 117             break;
 118
 119         case wxFONTENCODING_SYSTEM:
 120             info->mglEncoding = MGL_ENCODING_ASCII;
 121             break;
 122
 123         default:
 124             // encoding not known to MGL
 125             return false;
 126     }
 127
 128     info->encoding = encoding;
 129
 130     return true;
 131 }
 132
 133 bool wxTestFontEncoding(const wxNativeEncodingInfo& info)
 134 {
 135     if ( !info.facename )
 136         return true;
 137
 138     wxMGLFontFamily *family = wxTheFontsManager->GetFamily(info.facename);
 139     if ( !family )
 140         return false;
 141     if ( family->GetInfo()->fontLibType == MGL_BITMAPFONT_LIB )
 142         return (info.mglEncoding == MGL_ENCODING_ASCII ||
 143                 info.mglEncoding == MGL_ENCODING_ISO8859_1 ||
 144                 info.mglEncoding == MGL_ENCODING_ISO8859_15 ||
 145                 info.mglEncoding == MGL_ENCODING_CP1252);
 146     else
 147         return true;
 148 }
 149
 150
 151 // ----------------------------------------------------------------------------
 152 // wxFontFamily, wxMGLFontInstance, wxMGLFontLibrary
 153 // ----------------------------------------------------------------------------
 154
 155 WX_DECLARE_LIST(wxMGLFontInstance, wxMGLFontInstanceList);
 156 WX_DEFINE_LIST(wxMGLFontInstanceList);
 157 WX_DEFINE_LIST(wxMGLFontFamilyList);
 158
 159 wxMGLFontInstance::wxMGLFontInstance(wxMGLFontLibrary *fontLib,
 160                                      float pt, bool slant, bool aa)
 161 {
 162     m_fontLib = fontLib;
 163     m_font = NULL;
 164     m_pt = pt;
 165     m_slant = slant;
 166     m_aa = aa;
 167
 168     float slantAngle = m_slant ? 15.0 : 0.0;
 169
 170     wxLogTrace("mgl_font", "loading instance of '%s' slant=%i pt=%0.1f aa=%i",
 171                m_fontLib->GetMGLfont_lib_t()->name, m_slant, m_pt, m_aa);
 172     m_font = MGL_loadFontInstance(m_fontLib->GetMGLfont_lib_t(),
 173                                   m_pt, slantAngle, 0.0, aa);
 174     wxASSERT_MSG( m_font, wxT("Cannot create font instance.") );
 175 }
 176
 177 wxMGLFontInstance::~wxMGLFontInstance()
 178 {
 179     wxLogTrace("mgl_font", "unloading instance of '%s' slant=%i pt=%0.1f aa=%i",
 180                m_fontLib->GetMGLfont_lib_t()->name, m_slant, m_pt, m_aa);
 181     if ( m_font )
 182         MGL_unloadFontInstance(m_font);
 183 }
 184
 185 wxMGLFontLibrary::wxMGLFontLibrary(const wxString& filename, int type,
 186                                    wxMGLFontFamily *parentFamily)
 187 {
 188     m_family = parentFamily;
 189     m_type = type;
 190     m_fileName = filename;
 191     m_refs = 0;
 192     m_fontLib = NULL;
 193
 194     m_instances = new wxMGLFontInstanceList;
 195     m_instances->DeleteContents(true);
 196 }
 197
 198 wxMGLFontLibrary::~wxMGLFontLibrary()
 199 {
 200     wxLogTrace("mgl_font", "font library dtor '%s'", m_fileName.mb_str());
 201     delete m_instances;
 202 }
 203
 204 void wxMGLFontLibrary::IncRef()
 205 {
 206     wxLogTrace("mgl_font", "incRef(%u) '%s'", m_refs, m_fileName.c_str());
 207     if ( m_refs++ == 0 )
 208     {
 209         wxLogTrace("mgl_font", "opening library '%s'", m_fileName.mb_str());
 210         m_fontLib = MGL_openFontLib(m_fileName.mb_str());
 211     }
 212 }
 213
 214 void wxMGLFontLibrary::DecRef()
 215 {
 216     wxLogTrace("mgl_font", "decRef(%u) '%s'", m_refs, m_fileName.c_str());
 217     if ( --m_refs == 0 )
 218     {
 219         wxLogTrace("mgl_font", "killing instances of '%s'", m_fileName.mb_str());
 220         m_instances->Clear();
 221         wxLogTrace("mgl_font", "closing library '%s'", m_fileName.mb_str());
 222         MGL_closeFontLib(m_fontLib);
 223         m_fontLib = NULL;
 224     }
 225 }
 226
 227 static int gs_antialiasingThreshold = -1;
 228
 229 wxMGLFontInstance *wxMGLFontLibrary::GetFontInstance(wxFont *font,
 230                                                      float scale, bool aa)
 231 {
 232     wxASSERT_MSG(m_refs > 0 && m_fontLib, wxT("font library not loaded!"));
 233
 234     wxString facename;
 235     float pt = (float)font->GetPointSize() * scale;
 236
 237     if ( gs_antialiasingThreshold == -1 )
 238     {
 239         gs_antialiasingThreshold = 10;
 240 #if wxUSE_SYSTEM_OPTIONS
 241         if ( wxSystemOptions::HasOption(wxT("mgl.aa-threshold")) )
 242             gs_antialiasingThreshold =
 243                 wxSystemOptions::GetOptionInt(wxT("mgl.aa-threshold"));
 244         wxLogTrace("mgl_font", "AA threshold set to %i", gs_antialiasingThreshold);
 245 #endif
 246     }
 247
 248     // Small characters don't look good when antialiased with the algorithm
 249     // that FreeType uses (mere 2x2 supersampling), so lets disable it AA
 250     // completely for small fonts.
 251     bool antialiased = false;
 252     if (( pt > gs_antialiasingThreshold ) &&
 253         ( m_fontLib->fontLibType != MGL_BITMAPFONT_LIB ) )
 254         antialiased = aa;
 255
 256     bool slant = (((m_type & wxFONTFACE_ITALIC) == 0) &&
 257              (font->GetStyle() == wxSLANT || font->GetStyle() == wxITALIC));
 258
 259     // FIXME_MGL -- MGL does not yet support slant, although the API is there
 260     slant = false;
 261
 262     wxLogTrace("mgl_font", "requested instance of '%s' slant=%i pt=%0.1f aa=%i",
 263                m_fileName.mb_str(), slant, pt, antialiased);
 264
 265     wxMGLFontInstance *i;
 266     wxMGLFontInstanceList::Node *node;
 267
 268     for (node = m_instances->GetFirst(); node; node = node->GetNext())
 269     {
 270         i = node->GetData();
 271         if ( i->GetPt() == pt && i->GetSlant() == slant &&
 272              i->GetAA() == antialiased )
 273         {
 274             wxLogTrace("mgl_font", "    got from cache: slant=%i pt=%0.1f aa=%i",
 275                        i->GetSlant(), i->GetPt(), i->GetAA());
 276             return i;
 277         }
 278     }
 279
 280     i = new wxMGLFontInstance(this, pt, slant, antialiased);
 281     m_instances->Append(i);
 282     return i;
 283 }
 284
 285
 286 wxMGLFontFamily::wxMGLFontFamily(const font_info_t *info)
 287 {
 288     m_name = info->familyName;
 289     m_fontInfo = info;
 290
 291     if ( info->regularFace[0] == '\0' )
 292         m_fontLibs[wxFONTFACE_REGULAR] = NULL;
 293     else
 294         m_fontLibs[wxFONTFACE_REGULAR] =
 295             new wxMGLFontLibrary(info->regularFace, wxFONTFACE_REGULAR, this);
 296
 297     if ( info->italicFace[0] == '\0' )
 298         m_fontLibs[wxFONTFACE_ITALIC] = NULL;
 299     else
 300         m_fontLibs[wxFONTFACE_ITALIC] =
 301             new wxMGLFontLibrary(info->italicFace, wxFONTFACE_ITALIC, this);
 302
 303     if ( info->boldFace[0] == '\0' )
 304         m_fontLibs[wxFONTFACE_BOLD] = NULL;
 305     else
 306         m_fontLibs[wxFONTFACE_BOLD] =
 307             new wxMGLFontLibrary(info->boldFace, wxFONTFACE_BOLD, this);
 308
 309     if ( info->boldItalicFace[0] == '\0' )
 310         m_fontLibs[wxFONTFACE_BOLD_ITALIC] = NULL;
 311     else
 312         m_fontLibs[wxFONTFACE_BOLD_ITALIC] =
 313             new wxMGLFontLibrary(info->boldItalicFace, wxFONTFACE_BOLD_ITALIC, this);
 314
 315     wxLogTrace("mgl_font", "new family '%s' (r=%s, i=%s, b=%s, bi=%s)\n",
 316                info->familyName, info->regularFace, info->italicFace,
 317                info->boldFace, info->boldItalicFace);
 318 }
 319
 320 wxMGLFontFamily::~wxMGLFontFamily()
 321 {
 322     for (size_t i = 0; i < wxFONTFACE_MAX; i++)
 323         delete m_fontLibs[i];
 324 }
 325
 326 bool wxMGLFontFamily::HasFace(int type) const
 327 {
 328     return (m_fontLibs[type] != NULL);
 329 }
 330
 331
 332 // ----------------------------------------------------------------------------
 333 // wxFontsManager
 334 // ----------------------------------------------------------------------------
 335
 336 wxMGLFontLibrary *wxFontsManager::GetFontLibrary(wxFont *font)
 337 {
 338     wxMGLFontFamily *family;
 339     int type;
 340     wxString facename = font->GetFaceName();
 341
 342     if ( !facename.empty() )
 343         family = GetFamily(facename);
 344     else
 345         family = NULL;
 346
 347     if ( !family )
 348     {
 349         facename.Empty();
 350         switch (font->GetFamily())
 351         {
 352             case wxSCRIPT:
 353                 facename = wxT("Script");
 354                 break;
 355             case wxDECORATIVE:
 356                 facename = wxT("Charter");
 357                 break;
 358             case wxROMAN:
 359                 facename = wxT("Times");
 360                 break;
 361             case wxTELETYPE:
 362             case wxMODERN:
 363                 facename = wxT("Courier");
 364                 break;
 365             case wxSWISS:
 366                 facename = wxT("Helvetica");
 367                 break;
 368             case wxDEFAULT:
 369             default:
 370                 facename = wxT("Helvetica");
 371                 break;
 372         }
 373
 374         family = GetFamily(facename);
 375         if ( !family )
 376         {
 377            if ( m_list->GetFirst() )
 378                family = m_list->GetFirst()->GetData();
 379            else
 380                wxFAIL_MSG(wxT("Fatal error, no fonts available!"));
 381         }
 382     }
 383
 384     type = wxFONTFACE_REGULAR;
 385
 386     if ( font->GetWeight() == wxBOLD )
 387         type |= wxFONTFACE_BOLD;
 388
 389     // FIXME_MGL -- this should read "if ( font->GetStyle() == wxITALIC )",
 390     // but since MGL does not yet support slant, we try to display it with
 391     // italic face (better than nothing...)
 392     if ( font->GetStyle() == wxITALIC || font->GetStyle() == wxSLANT )
 393     {
 394         if ( family->HasFace(type | wxFONTFACE_ITALIC) )
 395             type |= wxFONTFACE_ITALIC;
 396     }
 397     if ( !family->HasFace(type) )
 398     {
 399         for (int i = 0; i < wxFONTFACE_MAX; i++)
 400             if ( family->HasFace(i) )
 401             {
 402                 type = i;
 403                 break;
 404             }
 405     }
 406
 407     return family->GetLibrary(type);
 408 }
 409
 410 static ibool MGLAPI enum_callback(const font_info_t *info, void *cookie)
 411 {
 412     wxFontsManager *db = (wxFontsManager*)cookie;
 413     db->AddFamily(info);
 414     return TRUE;
 415 }
 416
 417 wxFontsManager::wxFontsManager()
 418 {
 419     m_hash = new wxHashTable(wxKEY_STRING);
 420     m_hash->DeleteContents(false);
 421     m_list = new wxMGLFontFamilyList;
 422     m_list->DeleteContents(true);
 423     MGL_enumerateFonts(enum_callback, (void*)this);
 424 }
 425
 426 wxFontsManager::~wxFontsManager()
 427 {
 428     delete m_hash;
 429     delete m_list;
 430 }
 431
 432 void wxFontsManager::AddFamily(const font_info_t *info)
 433 {
 434     wxMGLFontFamily *f = new wxMGLFontFamily(info);
 435     m_hash->Put(f->GetName().Lower(), f);
 436     m_list->Append(f);
 437 }
 438
 439 wxMGLFontFamily *wxFontsManager::GetFamily(const wxString& name) const
 440 {
 441     return (wxMGLFontFamily*)m_hash->Get(name.Lower());
 442 }
 443
 444
 445 wxFontsManager *wxTheFontsManager = NULL;