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/modules/freetype2/src/type42/t42objs.c

http://github.com/zpao/v8monkey
C | 652 lines | 432 code | 146 blank | 74 comment | 59 complexity | 04c7ce75c6e172df003a4fd881d36771 MD5 | raw file
  1/***************************************************************************/
  2/*                                                                         */
  3/*  t42objs.c                                                              */
  4/*                                                                         */
  5/*    Type 42 objects manager (body).                                      */
  6/*                                                                         */
  7/*  Copyright 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009               */
  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      error = T42_Err_Unknown_File_Format;
 65      goto Exit;
 66    }
 67
 68    /* now, propagate the charstrings and glyphnames tables */
 69    /* to the Type1 data                                    */
 70    type1->num_glyphs = loader.num_glyphs;
 71
 72    if ( !loader.charstrings.init )
 73    {
 74      FT_ERROR(( "T42_Open_Face: no charstrings array in face\n" ));
 75      error = T42_Err_Invalid_File_Format;
 76    }
 77
 78    loader.charstrings.init  = 0;
 79    type1->charstrings_block = loader.charstrings.block;
 80    type1->charstrings       = loader.charstrings.elements;
 81    type1->charstrings_len   = loader.charstrings.lengths;
 82
 83    /* we copy the glyph names `block' and `elements' fields; */
 84    /* the `lengths' field must be released later             */
 85    type1->glyph_names_block    = loader.glyph_names.block;
 86    type1->glyph_names          = (FT_String**)loader.glyph_names.elements;
 87    loader.glyph_names.block    = 0;
 88    loader.glyph_names.elements = 0;
 89
 90    /* we must now build type1.encoding when we have a custom array */
 91    if ( type1->encoding_type == T1_ENCODING_TYPE_ARRAY )
 92    {
 93      FT_Int    charcode, idx, min_char, max_char;
 94      FT_Byte*  char_name;
 95      FT_Byte*  glyph_name;
 96
 97
 98      /* OK, we do the following: for each element in the encoding   */
 99      /* table, look up the index of the glyph having the same name  */
100      /* as defined in the CharStrings array.                        */
101      /* The index is then stored in type1.encoding.char_index, and  */
102      /* the name in type1.encoding.char_name                        */
103
104      min_char = 0;
105      max_char = 0;
106
107      charcode = 0;
108      for ( ; charcode < loader.encoding_table.max_elems; charcode++ )
109      {
110        type1->encoding.char_index[charcode] = 0;
111        type1->encoding.char_name [charcode] = (char *)".notdef";
112
113        char_name = loader.encoding_table.elements[charcode];
114        if ( char_name )
115          for ( idx = 0; idx < type1->num_glyphs; idx++ )
116          {
117            glyph_name = (FT_Byte*)type1->glyph_names[idx];
118            if ( ft_strcmp( (const char*)char_name,
119                            (const char*)glyph_name ) == 0 )
120            {
121              type1->encoding.char_index[charcode] = (FT_UShort)idx;
122              type1->encoding.char_name [charcode] = (char*)glyph_name;
123
124              /* Change min/max encoded char only if glyph name is */
125              /* not /.notdef                                      */
126              if ( ft_strcmp( (const char*)".notdef",
127                              (const char*)glyph_name ) != 0 )
128              {
129                if ( charcode < min_char )
130                  min_char = charcode;
131                if ( charcode >= max_char )
132                  max_char = charcode + 1;
133              }
134              break;
135            }
136          }
137      }
138
139      type1->encoding.code_first = min_char;
140      type1->encoding.code_last  = max_char;
141      type1->encoding.num_chars  = loader.num_chars;
142    }
143
144  Exit:
145    t42_loader_done( &loader );
146    return error;
147  }
148
149
150  /***************** Driver Functions *************/
151
152
153  FT_LOCAL_DEF( FT_Error )
154  T42_Face_Init( FT_Stream      stream,
155                 T42_Face       face,
156                 FT_Int         face_index,
157                 FT_Int         num_params,
158                 FT_Parameter*  params )
159  {
160    FT_Error            error;
161    FT_Service_PsCMaps  psnames;
162    PSAux_Service       psaux;
163    FT_Face             root  = (FT_Face)&face->root;
164    T1_Font             type1 = &face->type1;
165    PS_FontInfo         info  = &type1->font_info;
166
167    FT_UNUSED( num_params );
168    FT_UNUSED( params );
169    FT_UNUSED( face_index );
170    FT_UNUSED( stream );
171
172
173    face->ttf_face       = NULL;
174    face->root.num_faces = 1;
175
176    FT_FACE_FIND_GLOBAL_SERVICE( face, psnames, POSTSCRIPT_CMAPS );
177    face->psnames = psnames;
178
179    face->psaux = FT_Get_Module_Interface( FT_FACE_LIBRARY( face ),
180                                           "psaux" );
181    psaux = (PSAux_Service)face->psaux;
182
183    /* open the tokenizer, this will also check the font format */
184    error = T42_Open_Face( face );
185    if ( error )
186      goto Exit;
187
188    /* if we just wanted to check the format, leave successfully now */
189    if ( face_index < 0 )
190      goto Exit;
191
192    /* check the face index */
193    if ( face_index > 0 )
194    {
195      FT_ERROR(( "T42_Face_Init: invalid face index\n" ));
196      error = T42_Err_Invalid_Argument;
197      goto Exit;
198    }
199
200    /* Now load the font program into the face object */
201
202    /* Init the face object fields */
203    /* Now set up root face fields */
204
205    root->num_glyphs   = type1->num_glyphs;
206    root->num_charmaps = 0;
207    root->face_index   = 0;
208
209    root->face_flags = FT_FACE_FLAG_SCALABLE    |
210                       FT_FACE_FLAG_HORIZONTAL  |
211                       FT_FACE_FLAG_GLYPH_NAMES;
212
213    if ( info->is_fixed_pitch )
214      root->face_flags |= FT_FACE_FLAG_FIXED_WIDTH;
215
216    /* We only set this flag if we have the patented bytecode interpreter. */
217    /* There are no known `tricky' Type42 fonts that could be loaded with  */
218    /* the unpatented interpreter.                                         */
219#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
220    root->face_flags |= FT_FACE_FLAG_HINTER;
221#endif
222
223    /* XXX: TODO -- add kerning with .afm support */
224
225    /* get style name -- be careful, some broken fonts only */
226    /* have a `/FontName' dictionary entry!                 */
227    root->family_name = info->family_name;
228    /* assume "Regular" style if we don't know better */
229    root->style_name = (char *)"Regular";
230    if ( root->family_name )
231    {
232      char*  full   = info->full_name;
233      char*  family = root->family_name;
234
235
236      if ( full )
237      {
238        while ( *full )
239        {
240          if ( *full == *family )
241          {
242            family++;
243            full++;
244          }
245          else
246          {
247            if ( *full == ' ' || *full == '-' )
248              full++;
249            else if ( *family == ' ' || *family == '-' )
250              family++;
251            else
252            {
253              if ( !*family )
254                root->style_name = full;
255              break;
256            }
257          }
258        }
259      }
260    }
261    else
262    {
263      /* do we have a `/FontName'? */
264      if ( type1->font_name )
265        root->family_name = type1->font_name;
266    }
267
268    /* no embedded bitmap support */
269    root->num_fixed_sizes = 0;
270    root->available_sizes = 0;
271
272    /* Load the TTF font embedded in the T42 font */
273    {
274      FT_Open_Args  args;
275
276
277      args.flags       = FT_OPEN_MEMORY;
278      args.memory_base = face->ttf_data;
279      args.memory_size = face->ttf_size;
280
281      if ( num_params )
282      {
283        args.flags     |= FT_OPEN_PARAMS;
284        args.num_params = num_params;
285        args.params     = params;
286      }
287
288      error = FT_Open_Face( FT_FACE_LIBRARY( face ),
289                            &args, 0, &face->ttf_face );
290    }
291
292    if ( error )
293      goto Exit;
294
295    FT_Done_Size( face->ttf_face->size );
296
297    /* Ignore info in FontInfo dictionary and use the info from the  */
298    /* loaded TTF font.  The PostScript interpreter also ignores it. */
299    root->bbox         = face->ttf_face->bbox;
300    root->units_per_EM = face->ttf_face->units_per_EM;
301
302    root->ascender  = face->ttf_face->ascender;
303    root->descender = face->ttf_face->descender;
304    root->height    = face->ttf_face->height;
305
306    root->max_advance_width  = face->ttf_face->max_advance_width;
307    root->max_advance_height = face->ttf_face->max_advance_height;
308
309    root->underline_position  = (FT_Short)info->underline_position;
310    root->underline_thickness = (FT_Short)info->underline_thickness;
311
312    /* compute style flags */
313    root->style_flags = 0;
314    if ( info->italic_angle )
315      root->style_flags |= FT_STYLE_FLAG_ITALIC;
316
317    if ( face->ttf_face->style_flags & FT_STYLE_FLAG_BOLD )
318      root->style_flags |= FT_STYLE_FLAG_BOLD;
319
320    if ( face->ttf_face->face_flags & FT_FACE_FLAG_VERTICAL )
321      root->face_flags |= FT_FACE_FLAG_VERTICAL;
322
323    {
324      if ( psnames && psaux )
325      {
326        FT_CharMapRec    charmap;
327        T1_CMap_Classes  cmap_classes = psaux->t1_cmap_classes;
328        FT_CMap_Class    clazz;
329
330
331        charmap.face = root;
332
333        /* first of all, try to synthesize a Unicode charmap */
334        charmap.platform_id = TT_PLATFORM_MICROSOFT;
335        charmap.encoding_id = TT_MS_ID_UNICODE_CS;
336        charmap.encoding    = FT_ENCODING_UNICODE;
337
338        error = FT_CMap_New( cmap_classes->unicode, NULL, &charmap, NULL );
339        if ( error && FT_Err_No_Unicode_Glyph_Name != error )
340          goto Exit;
341        error = FT_Err_Ok;
342
343        /* now, generate an Adobe Standard encoding when appropriate */
344        charmap.platform_id = TT_PLATFORM_ADOBE;
345        clazz               = NULL;
346
347        switch ( type1->encoding_type )
348        {
349        case T1_ENCODING_TYPE_STANDARD:
350          charmap.encoding    = FT_ENCODING_ADOBE_STANDARD;
351          charmap.encoding_id = TT_ADOBE_ID_STANDARD;
352          clazz               = cmap_classes->standard;
353          break;
354
355        case T1_ENCODING_TYPE_EXPERT:
356          charmap.encoding    = FT_ENCODING_ADOBE_EXPERT;
357          charmap.encoding_id = TT_ADOBE_ID_EXPERT;
358          clazz               = cmap_classes->expert;
359          break;
360
361        case T1_ENCODING_TYPE_ARRAY:
362          charmap.encoding    = FT_ENCODING_ADOBE_CUSTOM;
363          charmap.encoding_id = TT_ADOBE_ID_CUSTOM;
364          clazz               = cmap_classes->custom;
365          break;
366
367        case T1_ENCODING_TYPE_ISOLATIN1:
368          charmap.encoding    = FT_ENCODING_ADOBE_LATIN_1;
369          charmap.encoding_id = TT_ADOBE_ID_LATIN_1;
370          clazz               = cmap_classes->unicode;
371          break;
372
373        default:
374          ;
375        }
376
377        if ( clazz )
378          error = FT_CMap_New( clazz, NULL, &charmap, NULL );
379
380#if 0
381        /* Select default charmap */
382        if ( root->num_charmaps )
383          root->charmap = root->charmaps[0];
384#endif
385      }
386    }
387  Exit:
388    return error;
389  }
390
391
392  FT_LOCAL_DEF( void )
393  T42_Face_Done( T42_Face  face )
394  {
395    T1_Font      type1;
396    PS_FontInfo  info;
397    FT_Memory    memory;
398
399
400    if ( !face )
401      return;
402
403    type1  = &face->type1;
404    info   = &type1->font_info;
405    memory = face->root.memory;
406
407    /* delete internal ttf face prior to freeing face->ttf_data */
408    if ( face->ttf_face )
409      FT_Done_Face( face->ttf_face );
410
411    /* release font info strings */
412    FT_FREE( info->version );
413    FT_FREE( info->notice );
414    FT_FREE( info->full_name );
415    FT_FREE( info->family_name );
416    FT_FREE( info->weight );
417
418    /* release top dictionary */
419    FT_FREE( type1->charstrings_len );
420    FT_FREE( type1->charstrings );
421    FT_FREE( type1->glyph_names );
422
423    FT_FREE( type1->charstrings_block );
424    FT_FREE( type1->glyph_names_block );
425
426    FT_FREE( type1->encoding.char_index );
427    FT_FREE( type1->encoding.char_name );
428    FT_FREE( type1->font_name );
429
430    FT_FREE( face->ttf_data );
431
432#if 0
433    /* release afm data if present */
434    if ( face->afm_data )
435      T1_Done_AFM( memory, (T1_AFM*)face->afm_data );
436#endif
437
438    /* release unicode map, if any */
439    FT_FREE( face->unicode_map.maps );
440    face->unicode_map.num_maps = 0;
441
442    face->root.family_name = 0;
443    face->root.style_name  = 0;
444  }
445
446
447  /*************************************************************************/
448  /*                                                                       */
449  /* <Function>                                                            */
450  /*    T42_Driver_Init                                                    */
451  /*                                                                       */
452  /* <Description>                                                         */
453  /*    Initializes a given Type 42 driver object.                         */
454  /*                                                                       */
455  /* <Input>                                                               */
456  /*    driver :: A handle to the target driver object.                    */
457  /*                                                                       */
458  /* <Return>                                                              */
459  /*    FreeType error code.  0 means success.                             */
460  /*                                                                       */
461  FT_LOCAL_DEF( FT_Error )
462  T42_Driver_Init( T42_Driver  driver )
463  {
464    FT_Module  ttmodule;
465
466
467    ttmodule = FT_Get_Module( FT_MODULE(driver)->library, "truetype" );
468    driver->ttclazz = (FT_Driver_Class)ttmodule->clazz;
469
470    return T42_Err_Ok;
471  }
472
473
474  FT_LOCAL_DEF( void )
475  T42_Driver_Done( T42_Driver  driver )
476  {
477    FT_UNUSED( driver );
478  }
479
480
481  FT_LOCAL_DEF( FT_Error )
482  T42_Size_Init( T42_Size  size )
483  {
484    FT_Face   face = size->root.face;
485    T42_Face  t42face = (T42_Face)face;
486    FT_Size   ttsize;
487    FT_Error  error   = T42_Err_Ok;
488
489
490    error = FT_New_Size( t42face->ttf_face, &ttsize );
491    size->ttsize = ttsize;
492
493    FT_Activate_Size( ttsize );
494
495    return error;
496  }
497
498
499  FT_LOCAL_DEF( FT_Error )
500  T42_Size_Request( T42_Size         size,
501                    FT_Size_Request  req )
502  {
503    T42_Face  face = (T42_Face)size->root.face;
504    FT_Error  error;
505
506
507    FT_Activate_Size( size->ttsize );
508
509    error = FT_Request_Size( face->ttf_face, req );
510    if ( !error )
511      ( (FT_Size)size )->metrics = face->ttf_face->size->metrics;
512
513    return error;
514  }
515
516
517  FT_LOCAL_DEF( FT_Error )
518  T42_Size_Select( T42_Size  size,
519                   FT_ULong  strike_index )
520  {
521    T42_Face  face = (T42_Face)size->root.face;
522    FT_Error  error;
523
524
525    FT_Activate_Size( size->ttsize );
526
527    error = FT_Select_Size( face->ttf_face, (FT_Int)strike_index );
528    if ( !error )
529      ( (FT_Size)size )->metrics = face->ttf_face->size->metrics;
530
531    return error;
532
533  }
534
535
536  FT_LOCAL_DEF( void )
537  T42_Size_Done( T42_Size  size )
538  {
539    FT_Face      face    = size->root.face;
540    T42_Face     t42face = (T42_Face)face;
541    FT_ListNode  node;
542
543
544    node = FT_List_Find( &t42face->ttf_face->sizes_list, size->ttsize );
545    if ( node )
546    {
547      FT_Done_Size( size->ttsize );
548      size->ttsize = NULL;
549    }
550  }
551
552
553  FT_LOCAL_DEF( FT_Error )
554  T42_GlyphSlot_Init( T42_GlyphSlot  slot )
555  {
556    FT_Face       face    = slot->root.face;
557    T42_Face      t42face = (T42_Face)face;
558    FT_GlyphSlot  ttslot;
559    FT_Error      error   = T42_Err_Ok;
560
561
562    if ( face->glyph == NULL )
563    {
564      /* First glyph slot for this face */
565      slot->ttslot = t42face->ttf_face->glyph;
566    }
567    else
568    {
569      error = FT_New_GlyphSlot( t42face->ttf_face, &ttslot );
570      slot->ttslot = ttslot;
571    }
572
573    return error;
574  }
575
576
577  FT_LOCAL_DEF( void )
578  T42_GlyphSlot_Done( T42_GlyphSlot slot )
579  {
580    FT_Done_GlyphSlot( slot->ttslot );
581  }
582
583
584  static void
585  t42_glyphslot_clear( FT_GlyphSlot  slot )
586  {
587    /* free bitmap if needed */
588    ft_glyphslot_free_bitmap( slot );
589
590    /* clear all public fields in the glyph slot */
591    FT_ZERO( &slot->metrics );
592    FT_ZERO( &slot->outline );
593    FT_ZERO( &slot->bitmap );
594
595    slot->bitmap_left   = 0;
596    slot->bitmap_top    = 0;
597    slot->num_subglyphs = 0;
598    slot->subglyphs     = 0;
599    slot->control_data  = 0;
600    slot->control_len   = 0;
601    slot->other         = 0;
602    slot->format        = FT_GLYPH_FORMAT_NONE;
603
604    slot->linearHoriAdvance = 0;
605    slot->linearVertAdvance = 0;
606  }
607
608
609  FT_LOCAL_DEF( FT_Error )
610  T42_GlyphSlot_Load( FT_GlyphSlot  glyph,
611                      FT_Size       size,
612                      FT_UInt       glyph_index,
613                      FT_Int32      load_flags )
614  {
615    FT_Error         error;
616    T42_GlyphSlot    t42slot = (T42_GlyphSlot)glyph;
617    T42_Size         t42size = (T42_Size)size;
618    FT_Driver_Class  ttclazz = ((T42_Driver)glyph->face->driver)->ttclazz;
619
620
621    t42_glyphslot_clear( t42slot->ttslot );
622    error = ttclazz->load_glyph( t42slot->ttslot,
623                                 t42size->ttsize,
624                                 glyph_index,
625                                 load_flags | FT_LOAD_NO_BITMAP );
626
627    if ( !error )
628    {
629      glyph->metrics = t42slot->ttslot->metrics;
630
631      glyph->linearHoriAdvance = t42slot->ttslot->linearHoriAdvance;
632      glyph->linearVertAdvance = t42slot->ttslot->linearVertAdvance;
633
634      glyph->format  = t42slot->ttslot->format;
635      glyph->outline = t42slot->ttslot->outline;
636
637      glyph->bitmap      = t42slot->ttslot->bitmap;
638      glyph->bitmap_left = t42slot->ttslot->bitmap_left;
639      glyph->bitmap_top  = t42slot->ttslot->bitmap_top;
640
641      glyph->num_subglyphs = t42slot->ttslot->num_subglyphs;
642      glyph->subglyphs     = t42slot->ttslot->subglyphs;
643
644      glyph->control_data  = t42slot->ttslot->control_data;
645      glyph->control_len   = t42slot->ttslot->control_len;
646    }
647
648    return error;
649  }
650
651
652/* END */