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/src/freetype/src/type42/t42objs.c

https://bitbucket.org/cabalistic/ogredeps/
C | 679 lines | 455 code | 150 blank | 74 comment | 60 complexity | c33b8c06c3b490bc11831a738a30afe5 MD5 | raw file
  1/***************************************************************************/
  2/*                                                                         */
  3/*  t42objs.c                                                              */
  4/*                                                                         */
  5/*    Type 42 objects manager (body).                                      */
  6/*                                                                         */
  7/*  Copyright 2002-2009, 2011                                              */
  8/*  by Roberto Alameda.                                                    */
  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 "t42objs.h"
 20#include "t42parse.h"
 21#include "t42error.h"
 22#include FT_INTERNAL_DEBUG_H
 23#include FT_LIST_H
 24#include FT_TRUETYPE_IDS_H
 25
 26
 27#undef  FT_COMPONENT
 28#define FT_COMPONENT  trace_t42
 29
 30
 31  static FT_Error
 32  T42_Open_Face( T42_Face  face )
 33  {
 34    T42_LoaderRec  loader;
 35    T42_Parser     parser;
 36    T1_Font        type1 = &face->type1;
 37    FT_Memory      memory = face->root.memory;
 38    FT_Error       error;
 39
 40    PSAux_Service  psaux  = (PSAux_Service)face->psaux;
 41
 42
 43    t42_loader_init( &loader, face );
 44
 45    parser = &loader.parser;
 46
 47    if ( FT_ALLOC( face->ttf_data, 12 ) )
 48      goto Exit;
 49
 50    error = t42_parser_init( parser,
 51                             face->root.stream,
 52                             memory,
 53                             psaux);
 54    if ( error )
 55      goto Exit;
 56
 57    error = t42_parse_dict( face, &loader,
 58                            parser->base_dict, parser->base_len );
 59    if ( error )
 60      goto Exit;
 61
 62    if ( type1->font_type != 42 )
 63    {
 64      FT_ERROR(( "T42_Open_Face: cannot handle FontType %d\n",
 65                 type1->font_type ));
 66      error = T42_Err_Unknown_File_Format;
 67      goto Exit;
 68    }
 69
 70    /* now, propagate the charstrings and glyphnames tables */
 71    /* to the Type1 data                                    */
 72    type1->num_glyphs = loader.num_glyphs;
 73
 74    if ( !loader.charstrings.init )
 75    {
 76      FT_ERROR(( "T42_Open_Face: no charstrings array in face\n" ));
 77      error = T42_Err_Invalid_File_Format;
 78    }
 79
 80    loader.charstrings.init  = 0;
 81    type1->charstrings_block = loader.charstrings.block;
 82    type1->charstrings       = loader.charstrings.elements;
 83    type1->charstrings_len   = loader.charstrings.lengths;
 84
 85    /* we copy the glyph names `block' and `elements' fields; */
 86    /* the `lengths' field must be released later             */
 87    type1->glyph_names_block    = loader.glyph_names.block;
 88    type1->glyph_names          = (FT_String**)loader.glyph_names.elements;
 89    loader.glyph_names.block    = 0;
 90    loader.glyph_names.elements = 0;
 91
 92    /* we must now build type1.encoding when we have a custom array */
 93    if ( type1->encoding_type == T1_ENCODING_TYPE_ARRAY )
 94    {
 95      FT_Int    charcode, idx, min_char, max_char;
 96      FT_Byte*  char_name;
 97      FT_Byte*  glyph_name;
 98
 99
100      /* OK, we do the following: for each element in the encoding   */
101      /* table, look up the index of the glyph having the same name  */
102      /* as defined in the CharStrings array.                        */
103      /* The index is then stored in type1.encoding.char_index, and  */
104      /* the name in type1.encoding.char_name                        */
105
106      min_char = 0;
107      max_char = 0;
108
109      charcode = 0;
110      for ( ; charcode < loader.encoding_table.max_elems; charcode++ )
111      {
112        type1->encoding.char_index[charcode] = 0;
113        type1->encoding.char_name [charcode] = (char *)".notdef";
114
115        char_name = loader.encoding_table.elements[charcode];
116        if ( char_name )
117          for ( idx = 0; idx < type1->num_glyphs; idx++ )
118          {
119            glyph_name = (FT_Byte*)type1->glyph_names[idx];
120            if ( ft_strcmp( (const char*)char_name,
121                            (const char*)glyph_name ) == 0 )
122            {
123              type1->encoding.char_index[charcode] = (FT_UShort)idx;
124              type1->encoding.char_name [charcode] = (char*)glyph_name;
125
126              /* Change min/max encoded char only if glyph name is */
127              /* not /.notdef                                      */
128              if ( ft_strcmp( (const char*)".notdef",
129                              (const char*)glyph_name ) != 0 )
130              {
131                if ( charcode < min_char )
132                  min_char = charcode;
133                if ( charcode >= max_char )
134                  max_char = charcode + 1;
135              }
136              break;
137            }
138          }
139      }
140
141      type1->encoding.code_first = min_char;
142      type1->encoding.code_last  = max_char;
143      type1->encoding.num_chars  = loader.num_chars;
144    }
145
146  Exit:
147    t42_loader_done( &loader );
148    return error;
149  }
150
151
152  /***************** Driver Functions *************/
153
154
155  FT_LOCAL_DEF( FT_Error )
156  T42_Face_Init( FT_Stream      stream,
157                 FT_Face        t42face,       /* T42_Face */
158                 FT_Int         face_index,
159                 FT_Int         num_params,
160                 FT_Parameter*  params )
161  {
162    T42_Face            face  = (T42_Face)t42face;
163    FT_Error            error;
164    FT_Service_PsCMaps  psnames;
165    PSAux_Service       psaux;
166    FT_Face             root  = (FT_Face)&face->root;
167    T1_Font             type1 = &face->type1;
168    PS_FontInfo         info  = &type1->font_info;
169
170    FT_UNUSED( num_params );
171    FT_UNUSED( params );
172    FT_UNUSED( face_index );
173    FT_UNUSED( stream );
174
175
176    face->ttf_face       = NULL;
177    face->root.num_faces = 1;
178
179    FT_FACE_FIND_GLOBAL_SERVICE( face, psnames, POSTSCRIPT_CMAPS );
180    face->psnames = psnames;
181
182    face->psaux = FT_Get_Module_Interface( FT_FACE_LIBRARY( face ),
183                                           "psaux" );
184    psaux = (PSAux_Service)face->psaux;
185    if ( !psaux )
186    {
187      FT_ERROR(( "T42_Face_Init: cannot access `psaux' module\n" ));
188      error = T42_Err_Missing_Module;
189      goto Exit;
190    }
191
192    FT_TRACE2(( "Type 42 driver\n" ));
193
194    /* open the tokenizer, this will also check the font format */
195    error = T42_Open_Face( face );
196    if ( error )
197      goto Exit;
198
199    /* if we just wanted to check the format, leave successfully now */
200    if ( face_index < 0 )
201      goto Exit;
202
203    /* check the face index */
204    if ( face_index > 0 )
205    {
206      FT_ERROR(( "T42_Face_Init: invalid face index\n" ));
207      error = T42_Err_Invalid_Argument;
208      goto Exit;
209    }
210
211    /* Now load the font program into the face object */
212
213    /* Init the face object fields */
214    /* Now set up root face fields */
215
216    root->num_glyphs   = type1->num_glyphs;
217    root->num_charmaps = 0;
218    root->face_index   = 0;
219
220    root->face_flags = FT_FACE_FLAG_SCALABLE    |
221                       FT_FACE_FLAG_HORIZONTAL  |
222                       FT_FACE_FLAG_GLYPH_NAMES;
223
224    if ( info->is_fixed_pitch )
225      root->face_flags |= FT_FACE_FLAG_FIXED_WIDTH;
226
227    /* We only set this flag if we have the patented bytecode interpreter. */
228    /* There are no known `tricky' Type42 fonts that could be loaded with  */
229    /* the unpatented interpreter.                                         */
230#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
231    root->face_flags |= FT_FACE_FLAG_HINTER;
232#endif
233
234    /* XXX: TODO -- add kerning with .afm support */
235
236    /* get style name -- be careful, some broken fonts only */
237    /* have a `/FontName' dictionary entry!                 */
238    root->family_name = info->family_name;
239    /* assume "Regular" style if we don't know better */
240    root->style_name = (char *)"Regular";
241    if ( root->family_name )
242    {
243      char*  full   = info->full_name;
244      char*  family = root->family_name;
245
246
247      if ( full )
248      {
249        while ( *full )
250        {
251          if ( *full == *family )
252          {
253            family++;
254            full++;
255          }
256          else
257          {
258            if ( *full == ' ' || *full == '-' )
259              full++;
260            else if ( *family == ' ' || *family == '-' )
261              family++;
262            else
263            {
264              if ( !*family )
265                root->style_name = full;
266              break;
267            }
268          }
269        }
270      }
271    }
272    else
273    {
274      /* do we have a `/FontName'? */
275      if ( type1->font_name )
276        root->family_name = type1->font_name;
277    }
278
279    /* no embedded bitmap support */
280    root->num_fixed_sizes = 0;
281    root->available_sizes = 0;
282
283    /* Load the TTF font embedded in the T42 font */
284    {
285      FT_Open_Args  args;
286
287
288      args.flags       = FT_OPEN_MEMORY;
289      args.memory_base = face->ttf_data;
290      args.memory_size = face->ttf_size;
291
292      if ( num_params )
293      {
294        args.flags     |= FT_OPEN_PARAMS;
295        args.num_params = num_params;
296        args.params     = params;
297      }
298
299      error = FT_Open_Face( FT_FACE_LIBRARY( face ),
300                            &args, 0, &face->ttf_face );
301    }
302
303    if ( error )
304      goto Exit;
305
306    FT_Done_Size( face->ttf_face->size );
307
308    /* Ignore info in FontInfo dictionary and use the info from the  */
309    /* loaded TTF font.  The PostScript interpreter also ignores it. */
310    root->bbox         = face->ttf_face->bbox;
311    root->units_per_EM = face->ttf_face->units_per_EM;
312
313    root->ascender  = face->ttf_face->ascender;
314    root->descender = face->ttf_face->descender;
315    root->height    = face->ttf_face->height;
316
317    root->max_advance_width  = face->ttf_face->max_advance_width;
318    root->max_advance_height = face->ttf_face->max_advance_height;
319
320    root->underline_position  = (FT_Short)info->underline_position;
321    root->underline_thickness = (FT_Short)info->underline_thickness;
322
323    /* compute style flags */
324    root->style_flags = 0;
325    if ( info->italic_angle )
326      root->style_flags |= FT_STYLE_FLAG_ITALIC;
327
328    if ( face->ttf_face->style_flags & FT_STYLE_FLAG_BOLD )
329      root->style_flags |= FT_STYLE_FLAG_BOLD;
330
331    if ( face->ttf_face->face_flags & FT_FACE_FLAG_VERTICAL )
332      root->face_flags |= FT_FACE_FLAG_VERTICAL;
333
334    {
335      if ( psnames )
336      {
337        FT_CharMapRec    charmap;
338        T1_CMap_Classes  cmap_classes = psaux->t1_cmap_classes;
339        FT_CMap_Class    clazz;
340
341
342        charmap.face = root;
343
344        /* first of all, try to synthesize a Unicode charmap */
345        charmap.platform_id = TT_PLATFORM_MICROSOFT;
346        charmap.encoding_id = TT_MS_ID_UNICODE_CS;
347        charmap.encoding    = FT_ENCODING_UNICODE;
348
349        error = FT_CMap_New( cmap_classes->unicode, NULL, &charmap, NULL );
350        if ( error && FT_Err_No_Unicode_Glyph_Name != error )
351          goto Exit;
352        error = FT_Err_Ok;
353
354        /* now, generate an Adobe Standard encoding when appropriate */
355        charmap.platform_id = TT_PLATFORM_ADOBE;
356        clazz               = NULL;
357
358        switch ( type1->encoding_type )
359        {
360        case T1_ENCODING_TYPE_STANDARD:
361          charmap.encoding    = FT_ENCODING_ADOBE_STANDARD;
362          charmap.encoding_id = TT_ADOBE_ID_STANDARD;
363          clazz               = cmap_classes->standard;
364          break;
365
366        case T1_ENCODING_TYPE_EXPERT:
367          charmap.encoding    = FT_ENCODING_ADOBE_EXPERT;
368          charmap.encoding_id = TT_ADOBE_ID_EXPERT;
369          clazz               = cmap_classes->expert;
370          break;
371
372        case T1_ENCODING_TYPE_ARRAY:
373          charmap.encoding    = FT_ENCODING_ADOBE_CUSTOM;
374          charmap.encoding_id = TT_ADOBE_ID_CUSTOM;
375          clazz               = cmap_classes->custom;
376          break;
377
378        case T1_ENCODING_TYPE_ISOLATIN1:
379          charmap.encoding    = FT_ENCODING_ADOBE_LATIN_1;
380          charmap.encoding_id = TT_ADOBE_ID_LATIN_1;
381          clazz               = cmap_classes->unicode;
382          break;
383
384        default:
385          ;
386        }
387
388        if ( clazz )
389          error = FT_CMap_New( clazz, NULL, &charmap, NULL );
390
391#if 0
392        /* Select default charmap */
393        if ( root->num_charmaps )
394          root->charmap = root->charmaps[0];
395#endif
396      }
397    }
398  Exit:
399    return error;
400  }
401
402
403  FT_LOCAL_DEF( void )
404  T42_Face_Done( FT_Face  t42face )
405  {
406    T42_Face     face = (T42_Face)t42face;
407    T1_Font      type1;
408    PS_FontInfo  info;
409    FT_Memory    memory;
410
411
412    if ( !face )
413      return;
414
415    type1  = &face->type1;
416    info   = &type1->font_info;
417    memory = face->root.memory;
418
419    /* delete internal ttf face prior to freeing face->ttf_data */
420    if ( face->ttf_face )
421      FT_Done_Face( face->ttf_face );
422
423    /* release font info strings */
424    FT_FREE( info->version );
425    FT_FREE( info->notice );
426    FT_FREE( info->full_name );
427    FT_FREE( info->family_name );
428    FT_FREE( info->weight );
429
430    /* release top dictionary */
431    FT_FREE( type1->charstrings_len );
432    FT_FREE( type1->charstrings );
433    FT_FREE( type1->glyph_names );
434
435    FT_FREE( type1->charstrings_block );
436    FT_FREE( type1->glyph_names_block );
437
438    FT_FREE( type1->encoding.char_index );
439    FT_FREE( type1->encoding.char_name );
440    FT_FREE( type1->font_name );
441
442    FT_FREE( face->ttf_data );
443
444#if 0
445    /* release afm data if present */
446    if ( face->afm_data )
447      T1_Done_AFM( memory, (T1_AFM*)face->afm_data );
448#endif
449
450    /* release unicode map, if any */
451    FT_FREE( face->unicode_map.maps );
452    face->unicode_map.num_maps = 0;
453
454    face->root.family_name = 0;
455    face->root.style_name  = 0;
456  }
457
458
459  /*************************************************************************/
460  /*                                                                       */
461  /* <Function>                                                            */
462  /*    T42_Driver_Init                                                    */
463  /*                                                                       */
464  /* <Description>                                                         */
465  /*    Initializes a given Type 42 driver object.                         */
466  /*                                                                       */
467  /* <Input>                                                               */
468  /*    driver :: A handle to the target driver object.                    */
469  /*                                                                       */
470  /* <Return>                                                              */
471  /*    FreeType error code.  0 means success.                             */
472  /*                                                                       */
473  FT_LOCAL_DEF( FT_Error )
474  T42_Driver_Init( FT_Module  module )        /* T42_Driver */
475  {
476    T42_Driver  driver = (T42_Driver)module;
477    FT_Module   ttmodule;
478
479
480    ttmodule = FT_Get_Module( module->library, "truetype" );
481    if ( !ttmodule )
482    {
483      FT_ERROR(( "T42_Driver_Init: cannot access `truetype' module\n" ));
484      return T42_Err_Missing_Module;
485    }
486
487    driver->ttclazz = (FT_Driver_Class)ttmodule->clazz;
488
489    return T42_Err_Ok;
490  }
491
492
493  FT_LOCAL_DEF( void )
494  T42_Driver_Done( FT_Module  module )
495  {
496    FT_UNUSED( module );
497  }
498
499
500  FT_LOCAL_DEF( FT_Error )
501  T42_Size_Init( FT_Size  size )         /* T42_Size */
502  {
503    T42_Size  t42size = (T42_Size)size;
504    FT_Face   face    = size->face;
505    T42_Face  t42face = (T42_Face)face;
506    FT_Size   ttsize;
507    FT_Error  error   = T42_Err_Ok;
508
509
510    error = FT_New_Size( t42face->ttf_face, &ttsize );
511    t42size->ttsize = ttsize;
512
513    FT_Activate_Size( ttsize );
514
515    return error;
516  }
517
518
519  FT_LOCAL_DEF( FT_Error )
520  T42_Size_Request( FT_Size          t42size,      /* T42_Size */
521                    FT_Size_Request  req )
522  {
523    T42_Size  size = (T42_Size)t42size;
524    T42_Face  face = (T42_Face)t42size->face;
525    FT_Error  error;
526
527
528    FT_Activate_Size( size->ttsize );
529
530    error = FT_Request_Size( face->ttf_face, req );
531    if ( !error )
532      t42size->metrics = face->ttf_face->size->metrics;
533
534    return error;
535  }
536
537
538  FT_LOCAL_DEF( FT_Error )
539  T42_Size_Select( FT_Size   t42size,         /* T42_Size */
540                   FT_ULong  strike_index )
541  {
542    T42_Size  size = (T42_Size)t42size;
543    T42_Face  face = (T42_Face)t42size->face;
544    FT_Error  error;
545
546
547    FT_Activate_Size( size->ttsize );
548
549    error = FT_Select_Size( face->ttf_face, (FT_Int)strike_index );
550    if ( !error )
551      t42size->metrics = face->ttf_face->size->metrics;
552
553    return error;
554
555  }
556
557
558  FT_LOCAL_DEF( void )
559  T42_Size_Done( FT_Size  t42size )             /* T42_Size */
560  {
561    T42_Size     size    = (T42_Size)t42size;
562    FT_Face      face    = t42size->face;
563    T42_Face     t42face = (T42_Face)face;
564    FT_ListNode  node;
565
566
567    node = FT_List_Find( &t42face->ttf_face->sizes_list, size->ttsize );
568    if ( node )
569    {
570      FT_Done_Size( size->ttsize );
571      size->ttsize = NULL;
572    }
573  }
574
575
576  FT_LOCAL_DEF( FT_Error )
577  T42_GlyphSlot_Init( FT_GlyphSlot  t42slot )        /* T42_GlyphSlot */
578  {
579    T42_GlyphSlot  slot    = (T42_GlyphSlot)t42slot;
580    FT_Face        face    = t42slot->face;
581    T42_Face       t42face = (T42_Face)face;
582    FT_GlyphSlot   ttslot;
583    FT_Error       error   = T42_Err_Ok;
584
585
586    if ( face->glyph == NULL )
587    {
588      /* First glyph slot for this face */
589      slot->ttslot = t42face->ttf_face->glyph;
590    }
591    else
592    {
593      error = FT_New_GlyphSlot( t42face->ttf_face, &ttslot );
594      slot->ttslot = ttslot;
595    }
596
597    return error;
598  }
599
600
601  FT_LOCAL_DEF( void )
602  T42_GlyphSlot_Done( FT_GlyphSlot  t42slot )       /* T42_GlyphSlot */
603  {
604    T42_GlyphSlot  slot = (T42_GlyphSlot)t42slot;
605
606
607    FT_Done_GlyphSlot( slot->ttslot );
608  }
609
610
611  static void
612  t42_glyphslot_clear( FT_GlyphSlot  slot )
613  {
614    /* free bitmap if needed */
615    ft_glyphslot_free_bitmap( slot );
616
617    /* clear all public fields in the glyph slot */
618    FT_ZERO( &slot->metrics );
619    FT_ZERO( &slot->outline );
620    FT_ZERO( &slot->bitmap );
621
622    slot->bitmap_left   = 0;
623    slot->bitmap_top    = 0;
624    slot->num_subglyphs = 0;
625    slot->subglyphs     = 0;
626    slot->control_data  = 0;
627    slot->control_len   = 0;
628    slot->other         = 0;
629    slot->format        = FT_GLYPH_FORMAT_NONE;
630
631    slot->linearHoriAdvance = 0;
632    slot->linearVertAdvance = 0;
633  }
634
635
636  FT_LOCAL_DEF( FT_Error )
637  T42_GlyphSlot_Load( FT_GlyphSlot  glyph,
638                      FT_Size       size,
639                      FT_UInt       glyph_index,
640                      FT_Int32      load_flags )
641  {
642    FT_Error         error;
643    T42_GlyphSlot    t42slot = (T42_GlyphSlot)glyph;
644    T42_Size         t42size = (T42_Size)size;
645    FT_Driver_Class  ttclazz = ((T42_Driver)glyph->face->driver)->ttclazz;
646
647
648    t42_glyphslot_clear( t42slot->ttslot );
649    error = ttclazz->load_glyph( t42slot->ttslot,
650                                 t42size->ttsize,
651                                 glyph_index,
652                                 load_flags | FT_LOAD_NO_BITMAP );
653
654    if ( !error )
655    {
656      glyph->metrics = t42slot->ttslot->metrics;
657
658      glyph->linearHoriAdvance = t42slot->ttslot->linearHoriAdvance;
659      glyph->linearVertAdvance = t42slot->ttslot->linearVertAdvance;
660
661      glyph->format  = t42slot->ttslot->format;
662      glyph->outline = t42slot->ttslot->outline;
663
664      glyph->bitmap      = t42slot->ttslot->bitmap;
665      glyph->bitmap_left = t42slot->ttslot->bitmap_left;
666      glyph->bitmap_top  = t42slot->ttslot->bitmap_top;
667
668      glyph->num_subglyphs = t42slot->ttslot->num_subglyphs;
669      glyph->subglyphs     = t42slot->ttslot->subglyphs;
670
671      glyph->control_data  = t42slot->ttslot->control_data;
672      glyph->control_len   = t42slot->ttslot->control_len;
673    }
674
675    return error;
676  }
677
678
679/* END */