lib/3rdparty/freetype/src/sfnt/sfdriver.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  sfdriver.c                                                             */
   4 /*                                                                         */
   5 /*    High-level SFNT driver interface (body).                             */
   6 /*                                                                         */
   7 /*  Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007 by             */
   8 /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
   9 /*                                                                         */
  10 /*  This file is part of the FreeType project, and may only be used,       */
  11 /*  modified, and distributed under the terms of the FreeType project      */
  12 /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
  13 /*  this file you indicate that you have read the license and              */
  14 /*  understand and accept it fully.                                        */
  15 /*                                                                         */
  16 /***************************************************************************/
  17
  18
  19 #include <ft2build.h>
  20 #include FT_INTERNAL_SFNT_H
  21 #include FT_INTERNAL_OBJECTS_H
  22
  23 #include "sfdriver.h"
  24 #include "ttload.h"
  25 #include "sfobjs.h"
  26
  27 #include "sferrors.h"
  28
  29 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
  30 #include "ttsbit.h"
  31 #endif
  32
  33 #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
  34 #include "ttpost.h"
  35 #endif
  36
  37 #ifdef TT_CONFIG_OPTION_BDF
  38 #include "ttbdf.h"
  39 #include FT_SERVICE_BDF_H
  40 #endif
  41
  42 #include "ttcmap.h"
  43 #include "ttkern.h"
  44 #include "ttmtx.h"
  45
  46 #include FT_SERVICE_GLYPH_DICT_H
  47 #include FT_SERVICE_POSTSCRIPT_NAME_H
  48 #include FT_SERVICE_SFNT_H
  49 #include FT_SERVICE_TT_CMAP_H
  50
  51
  52  /*
  53   *  SFNT TABLE SERVICE
  54   *
  55   */
  56
  57   static void*
  58   get_sfnt_table( TT_Face      face,
  59                   FT_Sfnt_Tag  tag )
  60   {
  61     void*  table;
  62
  63
  64     switch ( tag )
  65     {
  66     case ft_sfnt_head:
  67       table = &face->header;
  68       break;
  69
  70     case ft_sfnt_hhea:
  71       table = &face->horizontal;
  72       break;
  73
  74     case ft_sfnt_vhea:
  75       table = face->vertical_info ? &face->vertical : 0;
  76       break;
  77
  78     case ft_sfnt_os2:
  79       table = face->os2.version == 0xFFFFU ? 0 : &face->os2;
  80       break;
  81
  82     case ft_sfnt_post:
  83       table = &face->postscript;
  84       break;
  85
  86     case ft_sfnt_maxp:
  87       table = &face->max_profile;
  88       break;
  89
  90     case ft_sfnt_pclt:
  91       table = face->pclt.Version ? &face->pclt : 0;
  92       break;
  93
  94     default:
  95       table = 0;
  96     }
  97
  98     return table;
  99   }
 100
 101
 102   static FT_Error
 103   sfnt_table_info( TT_Face    face,
 104                    FT_UInt    idx,
 105                    FT_ULong  *tag,
 106                    FT_ULong  *length )
 107   {
 108     if ( !tag || !length )
 109       return SFNT_Err_Invalid_Argument;
 110
 111     if ( idx >= face->num_tables )
 112       return SFNT_Err_Table_Missing;
 113
 114     *tag    = face->dir_tables[idx].Tag;
 115     *length = face->dir_tables[idx].Length;
 116
 117     return SFNT_Err_Ok;
 118   }
 119
 120
 121   static const FT_Service_SFNT_TableRec  sfnt_service_sfnt_table =
 122   {
 123     (FT_SFNT_TableLoadFunc)tt_face_load_any,
 124     (FT_SFNT_TableGetFunc) get_sfnt_table,
 125     (FT_SFNT_TableInfoFunc)sfnt_table_info
 126   };
 127
 128
 129 #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
 130
 131  /*
 132   *  GLYPH DICT SERVICE
 133   *
 134   */
 135
 136   static FT_Error
 137   sfnt_get_glyph_name( TT_Face     face,
 138                        FT_UInt     glyph_index,
 139                        FT_Pointer  buffer,
 140                        FT_UInt     buffer_max )
 141   {
 142     FT_String*  gname;
 143     FT_Error    error;
 144
 145
 146     error = tt_face_get_ps_name( face, glyph_index, &gname );
 147     if ( !error )
 148       FT_STRCPYN( buffer, gname, buffer_max );
 149
 150     return error;
 151   }
 152
 153
 154   static const FT_Service_GlyphDictRec  sfnt_service_glyph_dict =
 155   {
 156     (FT_GlyphDict_GetNameFunc)  sfnt_get_glyph_name,
 157     (FT_GlyphDict_NameIndexFunc)NULL
 158   };
 159
 160 #endif /* TT_CONFIG_OPTION_POSTSCRIPT_NAMES */
 161
 162
 163  /*
 164   *  POSTSCRIPT NAME SERVICE
 165   *
 166   */
 167
 168   static const char*
 169   sfnt_get_ps_name( TT_Face  face )
 170   {
 171     FT_Int       n, found_win, found_apple;
 172     const char*  result = NULL;
 173
 174
 175     /* shouldn't happen, but just in case to avoid memory leaks */
 176     if ( face->postscript_name )
 177       return face->postscript_name;
 178
 179     /* scan the name table to see whether we have a Postscript name here, */
 180     /* either in Macintosh or Windows platform encodings                  */
 181     found_win   = -1;
 182     found_apple = -1;
 183
 184     for ( n = 0; n < face->num_names; n++ )
 185     {
 186       TT_NameEntryRec*  name = face->name_table.names + n;
 187
 188
 189       if ( name->nameID == 6 && name->stringLength > 0 )
 190       {
 191         if ( name->platformID == 3     &&
 192              name->encodingID == 1     &&
 193              name->languageID == 0x409 )
 194           found_win = n;
 195
 196         if ( name->platformID == 1 &&
 197              name->encodingID == 0 &&
 198              name->languageID == 0 )
 199           found_apple = n;
 200       }
 201     }
 202
 203     if ( found_win != -1 )
 204     {
 205       FT_Memory         memory = face->root.memory;
 206       TT_NameEntryRec*  name   = face->name_table.names + found_win;
 207       FT_UInt           len    = name->stringLength / 2;
 208       FT_Error          error  = SFNT_Err_Ok;
 209
 210       FT_UNUSED( error );
 211
 212
 213       if ( !FT_ALLOC( result, name->stringLength + 1 ) )
 214       {
 215         FT_Stream   stream = face->name_table.stream;
 216         FT_String*  r      = (FT_String*)result;
 217         FT_Byte*    p      = (FT_Byte*)name->string;
 218
 219
 220         if ( FT_STREAM_SEEK( name->stringOffset ) ||
 221              FT_FRAME_ENTER( name->stringLength ) )
 222         {
 223           FT_FREE( result );
 224           name->stringLength = 0;
 225           name->stringOffset = 0;
 226           FT_FREE( name->string );
 227
 228           goto Exit;
 229         }
 230
 231         p = (FT_Byte*)stream->cursor;
 232
 233         for ( ; len > 0; len--, p += 2 )
 234         {
 235           if ( p[0] == 0 && p[1] >= 32 && p[1] < 128 )
 236             *r++ = p[1];
 237         }
 238         *r = '\0';
 239
 240         FT_FRAME_EXIT();
 241       }
 242       goto Exit;
 243     }
 244
 245     if ( found_apple != -1 )
 246     {
 247       FT_Memory         memory = face->root.memory;
 248       TT_NameEntryRec*  name   = face->name_table.names + found_apple;
 249       FT_UInt           len    = name->stringLength;
 250       FT_Error          error  = SFNT_Err_Ok;
 251
 252       FT_UNUSED( error );
 253
 254
 255       if ( !FT_ALLOC( result, len + 1 ) )
 256       {
 257         FT_Stream  stream = face->name_table.stream;
 258
 259
 260         if ( FT_STREAM_SEEK( name->stringOffset ) ||
 261              FT_STREAM_READ( result, len )        )
 262         {
 263           name->stringOffset = 0;
 264           name->stringLength = 0;
 265           FT_FREE( name->string );
 266           FT_FREE( result );
 267           goto Exit;
 268         }
 269         ((char*)result)[len] = '\0';
 270       }
 271     }
 272
 273   Exit:
 274     face->postscript_name = result;
 275     return result;
 276   }
 277
 278   static const FT_Service_PsFontNameRec  sfnt_service_ps_name =
 279   {
 280     (FT_PsName_GetFunc)sfnt_get_ps_name
 281   };
 282
 283
 284   /*
 285    *  TT CMAP INFO
 286    */
 287   static const FT_Service_TTCMapsRec  tt_service_get_cmap_info =
 288   {
 289     (TT_CMap_Info_GetFunc)tt_get_cmap_info
 290   };
 291
 292
 293 #ifdef TT_CONFIG_OPTION_BDF
 294
 295   static FT_Error
 296   sfnt_get_charset_id( TT_Face       face,
 297                        const char*  *acharset_encoding,
 298                        const char*  *acharset_registry )
 299   {
 300     BDF_PropertyRec  encoding, registry;
 301     FT_Error         error;
 302
 303
 304     /* XXX: I don't know whether this is correct, since
 305      *      tt_face_find_bdf_prop only returns something correct if we have
 306      *      previously selected a size that is listed in the BDF table.
 307      *      Should we change the BDF table format to include single offsets
 308      *      for `CHARSET_REGISTRY' and `CHARSET_ENCODING'?
 309      */
 310     error = tt_face_find_bdf_prop( face, "CHARSET_REGISTRY", &registry );
 311     if ( !error )
 312     {
 313       error = tt_face_find_bdf_prop( face, "CHARSET_ENCODING", &encoding );
 314       if ( !error )
 315       {
 316         if ( registry.type == BDF_PROPERTY_TYPE_ATOM &&
 317              encoding.type == BDF_PROPERTY_TYPE_ATOM )
 318         {
 319           *acharset_encoding = encoding.u.atom;
 320           *acharset_registry = registry.u.atom;
 321         }
 322         else
 323           error = FT_Err_Invalid_Argument;
 324       }
 325     }
 326
 327     return error;
 328   }
 329
 330
 331   static const FT_Service_BDFRec  sfnt_service_bdf =
 332   {
 333     (FT_BDF_GetCharsetIdFunc) sfnt_get_charset_id,
 334     (FT_BDF_GetPropertyFunc)  tt_face_find_bdf_prop,
 335   };
 336
 337 #endif /* TT_CONFIG_OPTION_BDF */
 338
 339
 340   /*
 341    *  SERVICE LIST
 342    */
 343
 344   static const FT_ServiceDescRec  sfnt_services[] =
 345   {
 346     { FT_SERVICE_ID_SFNT_TABLE,           &sfnt_service_sfnt_table },
 347     { FT_SERVICE_ID_POSTSCRIPT_FONT_NAME, &sfnt_service_ps_name },
 348 #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
 349     { FT_SERVICE_ID_GLYPH_DICT,           &sfnt_service_glyph_dict },
 350 #endif
 351 #ifdef TT_CONFIG_OPTION_BDF
 352     { FT_SERVICE_ID_BDF,                  &sfnt_service_bdf },
 353 #endif
 354     { FT_SERVICE_ID_TT_CMAP,              &tt_service_get_cmap_info },
 355
 356     { NULL, NULL }
 357   };
 358
 359
 360   FT_CALLBACK_DEF( FT_Module_Interface )
 361   sfnt_get_interface( FT_Module    module,
 362                       const char*  module_interface )
 363   {
 364     FT_UNUSED( module );
 365
 366     return ft_service_list_lookup( sfnt_services, module_interface );
 367   }
 368
 369
 370 #ifdef FT_CONFIG_OPTION_OLD_INTERNALS
 371
 372   FT_CALLBACK_DEF( FT_Error )
 373   tt_face_load_sfnt_header_stub( TT_Face      face,
 374                                  FT_Stream    stream,
 375                                  FT_Long      face_index,
 376                                  SFNT_Header  header )
 377   {
 378     FT_UNUSED( face );
 379     FT_UNUSED( stream );
 380     FT_UNUSED( face_index );
 381     FT_UNUSED( header );
 382
 383     return FT_Err_Unimplemented_Feature;
 384   }
 385
 386
 387   FT_CALLBACK_DEF( FT_Error )
 388   tt_face_load_directory_stub( TT_Face      face,
 389                                FT_Stream    stream,
 390                                SFNT_Header  header )
 391   {
 392     FT_UNUSED( face );
 393     FT_UNUSED( stream );
 394     FT_UNUSED( header );
 395
 396     return FT_Err_Unimplemented_Feature;
 397   }
 398
 399
 400   FT_CALLBACK_DEF( FT_Error )
 401   tt_face_load_hdmx_stub( TT_Face    face,
 402                           FT_Stream  stream )
 403   {
 404     FT_UNUSED( face );
 405     FT_UNUSED( stream );
 406
 407     return FT_Err_Unimplemented_Feature;
 408   }
 409
 410
 411   FT_CALLBACK_DEF( void )
 412   tt_face_free_hdmx_stub( TT_Face  face )
 413   {
 414     FT_UNUSED( face );
 415   }
 416
 417
 418   FT_CALLBACK_DEF( FT_Error )
 419   tt_face_set_sbit_strike_stub( TT_Face    face,
 420                                 FT_UInt    x_ppem,
 421                                 FT_UInt    y_ppem,
 422                                 FT_ULong*  astrike_index )
 423   {
 424     /*
 425      * We simply forge a FT_Size_Request and call the real function
 426      * that does all the work.
 427      *
 428      * This stub might be called by libXfont in the X.Org Xserver,
 429      * compiled against version 2.1.8 or newer.
 430      */
 431
 432     FT_Size_RequestRec  req;
 433
 434
 435     req.type           = FT_SIZE_REQUEST_TYPE_NOMINAL;
 436     req.width          = (FT_F26Dot6)x_ppem;
 437     req.height         = (FT_F26Dot6)y_ppem;
 438     req.horiResolution = 0;
 439     req.vertResolution = 0;
 440
 441     *astrike_index = 0x7FFFFFFFUL;
 442
 443     return tt_face_set_sbit_strike( face, &req, astrike_index );
 444   }
 445
 446
 447   FT_CALLBACK_DEF( FT_Error )
 448   tt_face_load_sbit_stub( TT_Face    face,
 449                           FT_Stream  stream )
 450   {
 451     FT_UNUSED( face );
 452     FT_UNUSED( stream );
 453
 454     /*
 455      *  This function was originally implemented to load the sbit table.
 456      *  However, it has been replaced by `tt_face_load_eblc', and this stub
 457      *  is only there for some rogue clients which would want to call it
 458      *  directly (which doesn't make much sense).
 459      */
 460     return FT_Err_Unimplemented_Feature;
 461   }
 462
 463
 464   FT_CALLBACK_DEF( void )
 465   tt_face_free_sbit_stub( TT_Face  face )
 466   {
 467     /* nothing to do in this stub */
 468     FT_UNUSED( face );
 469   }
 470
 471
 472   FT_CALLBACK_DEF( FT_Error )
 473   tt_face_load_charmap_stub( TT_Face    face,
 474                              void*      cmap,
 475                              FT_Stream  input )
 476   {
 477     FT_UNUSED( face );
 478     FT_UNUSED( cmap );
 479     FT_UNUSED( input );
 480
 481     return FT_Err_Unimplemented_Feature;
 482   }
 483
 484
 485   FT_CALLBACK_DEF( FT_Error )
 486   tt_face_free_charmap_stub( TT_Face  face,
 487                              void*    cmap )
 488   {
 489     FT_UNUSED( face );
 490     FT_UNUSED( cmap );
 491
 492     return 0;
 493   }
 494
 495 #endif /* FT_CONFIG_OPTION_OLD_INTERNALS */
 496
 497
 498   static
 499   const SFNT_Interface  sfnt_interface =
 500   {
 501     tt_face_goto_table,
 502
 503     sfnt_init_face,
 504     sfnt_load_face,
 505     sfnt_done_face,
 506     sfnt_get_interface,
 507
 508     tt_face_load_any,
 509
 510 #ifdef FT_CONFIG_OPTION_OLD_INTERNALS
 511     tt_face_load_sfnt_header_stub,
 512     tt_face_load_directory_stub,
 513 #endif
 514
 515     tt_face_load_head,
 516     tt_face_load_hhea,
 517     tt_face_load_cmap,
 518     tt_face_load_maxp,
 519     tt_face_load_os2,
 520     tt_face_load_post,
 521
 522     tt_face_load_name,
 523     tt_face_free_name,
 524
 525 #ifdef FT_CONFIG_OPTION_OLD_INTERNALS
 526     tt_face_load_hdmx_stub,
 527     tt_face_free_hdmx_stub,
 528 #endif
 529
 530     tt_face_load_kern,
 531     tt_face_load_gasp,
 532     tt_face_load_pclt,
 533
 534 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
 535     /* see `ttload.h' */
 536     tt_face_load_bhed,
 537 #else
 538     0,
 539 #endif
 540
 541 #ifdef FT_CONFIG_OPTION_OLD_INTERNALS
 542     tt_face_set_sbit_strike_stub,
 543     tt_face_load_sbit_stub,
 544
 545     tt_find_sbit_image,
 546     tt_load_sbit_metrics,
 547 #endif
 548
 549 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
 550     tt_face_load_sbit_image,
 551 #else
 552     0,
 553 #endif
 554
 555 #ifdef FT_CONFIG_OPTION_OLD_INTERNALS
 556     tt_face_free_sbit_stub,
 557 #endif
 558
 559 #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
 560     /* see `ttpost.h' */
 561     tt_face_get_ps_name,
 562     tt_face_free_ps_names,
 563 #else
 564     0,
 565     0,
 566 #endif
 567
 568 #ifdef FT_CONFIG_OPTION_OLD_INTERNALS
 569     tt_face_load_charmap_stub,
 570     tt_face_free_charmap_stub,
 571 #endif
 572
 573     /* since version 2.1.8 */
 574
 575     tt_face_get_kerning,
 576
 577     /* since version 2.2 */
 578
 579     tt_face_load_font_dir,
 580     tt_face_load_hmtx,
 581
 582 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
 583     /* see `ttsbit.h' and `sfnt.h' */
 584     tt_face_load_eblc,
 585     tt_face_free_eblc,
 586
 587     tt_face_set_sbit_strike,
 588     tt_face_load_strike_metrics,
 589 #else
 590     0,
 591     0,
 592     0,
 593     0,
 594 #endif
 595
 596     tt_face_get_metrics
 597   };
 598
 599
 600   FT_CALLBACK_TABLE_DEF
 601   const FT_Module_Class  sfnt_module_class =
 602   {
 603     0,  /* not a font driver or renderer */
 604     sizeof( FT_ModuleRec ),
 605
 606     "sfnt",     /* driver name                            */
 607     0x10000L,   /* driver version 1.0                     */
 608     0x20000L,   /* driver requires FreeType 2.0 or higher */
 609
 610     (const void*)&sfnt_interface,  /* module specific interface */
 611
 612     (FT_Module_Constructor)0,
 613     (FT_Module_Destructor) 0,
 614     (FT_Module_Requester)  sfnt_get_interface
 615   };
 616
 617
 618 /* END */