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1 /***************************************************************************/
2 /*                                                                         */
3 /*  t42objs.c                                                              */
4 /*                                                                         */
5 /*    Type 42 objects manager (body).                                      */
6 /*                                                                         */
7 /*  Copyright 2002-2018 by                                                 */
8 /*  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
T42_Open_Face(T42_Face face)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     /* while parsing the font we always update `face->ttf_size' so that */
51     /* even in case of buggy data (which might lead to premature end of */
52     /* scanning without causing an error) the call to `FT_Open_Face' in */
53     /* `T42_Face_Init' passes the correct size                          */
54     face->ttf_size = 12;
55 
56     error = t42_parser_init( parser,
57                              face->root.stream,
58                              memory,
59                              psaux);
60     if ( error )
61       goto Exit;
62 
63     error = t42_parse_dict( face, &loader,
64                             parser->base_dict, parser->base_len );
65     if ( error )
66       goto Exit;
67 
68     if ( type1->font_type != 42 )
69     {
70       FT_ERROR(( "T42_Open_Face: cannot handle FontType %d\n",
71                  type1->font_type ));
72       error = FT_THROW( Unknown_File_Format );
73       goto Exit;
74     }
75 
76     /* now, propagate the charstrings and glyphnames tables */
77     /* to the Type1 data                                    */
78     type1->num_glyphs = loader.num_glyphs;
79 
80     if ( !loader.charstrings.init )
81     {
82       FT_ERROR(( "T42_Open_Face: no charstrings array in face\n" ));
83       error = FT_THROW( Invalid_File_Format );
84     }
85 
86     loader.charstrings.init  = 0;
87     type1->charstrings_block = loader.charstrings.block;
88     type1->charstrings       = loader.charstrings.elements;
89     type1->charstrings_len   = loader.charstrings.lengths;
90 
91     /* we copy the glyph names `block' and `elements' fields; */
92     /* the `lengths' field must be released later             */
93     type1->glyph_names_block    = loader.glyph_names.block;
94     type1->glyph_names          = (FT_String**)loader.glyph_names.elements;
95     loader.glyph_names.block    = NULL;
96     loader.glyph_names.elements = NULL;
97 
98     /* we must now build type1.encoding when we have a custom array */
99     if ( type1->encoding_type == T1_ENCODING_TYPE_ARRAY )
100     {
101       FT_Int    charcode, idx, min_char, max_char;
102       FT_Byte*  glyph_name;
103 
104 
105       /* OK, we do the following: for each element in the encoding   */
106       /* table, look up the index of the glyph having the same name  */
107       /* as defined in the CharStrings array.                        */
108       /* The index is then stored in type1.encoding.char_index, and  */
109       /* the name in type1.encoding.char_name                        */
110 
111       min_char = 0;
112       max_char = 0;
113 
114       charcode = 0;
115       for ( ; charcode < loader.encoding_table.max_elems; charcode++ )
116       {
117         FT_Byte*  char_name;
118 
119 
120         type1->encoding.char_index[charcode] = 0;
121         type1->encoding.char_name [charcode] = (char *)".notdef";
122 
123         char_name = loader.encoding_table.elements[charcode];
124         if ( char_name )
125           for ( idx = 0; idx < type1->num_glyphs; idx++ )
126           {
127             glyph_name = (FT_Byte*)type1->glyph_names[idx];
128             if ( ft_strcmp( (const char*)char_name,
129                             (const char*)glyph_name ) == 0 )
130             {
131               type1->encoding.char_index[charcode] = (FT_UShort)idx;
132               type1->encoding.char_name [charcode] = (char*)glyph_name;
133 
134               /* Change min/max encoded char only if glyph name is */
135               /* not /.notdef                                      */
136               if ( ft_strcmp( (const char*)".notdef",
137                               (const char*)glyph_name ) != 0 )
138               {
139                 if ( charcode < min_char )
140                   min_char = charcode;
141                 if ( charcode >= max_char )
142                   max_char = charcode + 1;
143               }
144               break;
145             }
146           }
147       }
148 
149       type1->encoding.code_first = min_char;
150       type1->encoding.code_last  = max_char;
151       type1->encoding.num_chars  = loader.num_chars;
152     }
153 
154   Exit:
155     t42_loader_done( &loader );
156     return error;
157   }
158 
159 
160   /***************** Driver Functions *************/
161 
162 
163   FT_LOCAL_DEF( FT_Error )
T42_Face_Init(FT_Stream stream,FT_Face t42face,FT_Int face_index,FT_Int num_params,FT_Parameter * params)164   T42_Face_Init( FT_Stream      stream,
165                  FT_Face        t42face,       /* T42_Face */
166                  FT_Int         face_index,
167                  FT_Int         num_params,
168                  FT_Parameter*  params )
169   {
170     T42_Face            face  = (T42_Face)t42face;
171     FT_Error            error;
172     FT_Service_PsCMaps  psnames;
173     PSAux_Service       psaux;
174     FT_Face             root  = (FT_Face)&face->root;
175     T1_Font             type1 = &face->type1;
176     PS_FontInfo         info  = &type1->font_info;
177 
178     FT_UNUSED( num_params );
179     FT_UNUSED( params );
180     FT_UNUSED( stream );
181 
182 
183     face->ttf_face       = NULL;
184     face->root.num_faces = 1;
185 
186     FT_FACE_FIND_GLOBAL_SERVICE( face, psnames, POSTSCRIPT_CMAPS );
187     face->psnames = psnames;
188 
189     face->psaux = FT_Get_Module_Interface( FT_FACE_LIBRARY( face ),
190                                            "psaux" );
191     psaux = (PSAux_Service)face->psaux;
192     if ( !psaux )
193     {
194       FT_ERROR(( "T42_Face_Init: cannot access `psaux' module\n" ));
195       error = FT_THROW( Missing_Module );
196       goto Exit;
197     }
198 
199     FT_TRACE2(( "Type 42 driver\n" ));
200 
201     /* open the tokenizer, this will also check the font format */
202     error = T42_Open_Face( face );
203     if ( error )
204       goto Exit;
205 
206     /* if we just wanted to check the format, leave successfully now */
207     if ( face_index < 0 )
208       goto Exit;
209 
210     /* check the face index */
211     if ( ( face_index & 0xFFFF ) > 0 )
212     {
213       FT_ERROR(( "T42_Face_Init: invalid face index\n" ));
214       error = FT_THROW( Invalid_Argument );
215       goto Exit;
216     }
217 
218     /* Now load the font program into the face object */
219 
220     /* Init the face object fields */
221     /* Now set up root face fields */
222 
223     root->num_glyphs   = type1->num_glyphs;
224     root->num_charmaps = 0;
225     root->face_index   = 0;
226 
227     root->face_flags |= FT_FACE_FLAG_SCALABLE    |
228                         FT_FACE_FLAG_HORIZONTAL  |
229                         FT_FACE_FLAG_GLYPH_NAMES;
230 
231     if ( info->is_fixed_pitch )
232       root->face_flags |= FT_FACE_FLAG_FIXED_WIDTH;
233 
234 #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
235     root->face_flags |= FT_FACE_FLAG_HINTER;
236 #endif
237 
238     /* XXX: TODO -- add kerning with .afm support */
239 
240     /* get style name -- be careful, some broken fonts only */
241     /* have a `/FontName' dictionary entry!                 */
242     root->family_name = info->family_name;
243     /* assume "Regular" style if we don't know better */
244     root->style_name = (char *)"Regular";
245     if ( root->family_name )
246     {
247       char*  full   = info->full_name;
248       char*  family = root->family_name;
249 
250 
251       if ( full )
252       {
253         while ( *full )
254         {
255           if ( *full == *family )
256           {
257             family++;
258             full++;
259           }
260           else
261           {
262             if ( *full == ' ' || *full == '-' )
263               full++;
264             else if ( *family == ' ' || *family == '-' )
265               family++;
266             else
267             {
268               if ( !*family )
269                 root->style_name = full;
270               break;
271             }
272           }
273         }
274       }
275     }
276     else
277     {
278       /* do we have a `/FontName'? */
279       if ( type1->font_name )
280         root->family_name = type1->font_name;
281     }
282 
283     /* no embedded bitmap support */
284     root->num_fixed_sizes = 0;
285     root->available_sizes = NULL;
286 
287     /* Load the TTF font embedded in the T42 font */
288     {
289       FT_Open_Args  args;
290 
291 
292       args.flags       = FT_OPEN_MEMORY | FT_OPEN_DRIVER;
293       args.driver      = FT_Get_Module( FT_FACE_LIBRARY( face ),
294                                         "truetype" );
295       args.memory_base = face->ttf_data;
296       args.memory_size = face->ttf_size;
297 
298       if ( num_params )
299       {
300         args.flags     |= FT_OPEN_PARAMS;
301         args.num_params = num_params;
302         args.params     = params;
303       }
304 
305       error = FT_Open_Face( FT_FACE_LIBRARY( face ),
306                             &args, 0, &face->ttf_face );
307     }
308 
309     if ( error )
310       goto Exit;
311 
312     FT_Done_Size( face->ttf_face->size );
313 
314     /* Ignore info in FontInfo dictionary and use the info from the  */
315     /* loaded TTF font.  The PostScript interpreter also ignores it. */
316     root->bbox         = face->ttf_face->bbox;
317     root->units_per_EM = face->ttf_face->units_per_EM;
318 
319     root->ascender  = face->ttf_face->ascender;
320     root->descender = face->ttf_face->descender;
321     root->height    = face->ttf_face->height;
322 
323     root->max_advance_width  = face->ttf_face->max_advance_width;
324     root->max_advance_height = face->ttf_face->max_advance_height;
325 
326     root->underline_position  = (FT_Short)info->underline_position;
327     root->underline_thickness = (FT_Short)info->underline_thickness;
328 
329     /* compute style flags */
330     root->style_flags = 0;
331     if ( info->italic_angle )
332       root->style_flags |= FT_STYLE_FLAG_ITALIC;
333 
334     if ( face->ttf_face->style_flags & FT_STYLE_FLAG_BOLD )
335       root->style_flags |= FT_STYLE_FLAG_BOLD;
336 
337     if ( face->ttf_face->face_flags & FT_FACE_FLAG_VERTICAL )
338       root->face_flags |= FT_FACE_FLAG_VERTICAL;
339 
340     {
341       if ( psnames )
342       {
343         FT_CharMapRec    charmap;
344         T1_CMap_Classes  cmap_classes = psaux->t1_cmap_classes;
345         FT_CMap_Class    clazz;
346 
347 
348         charmap.face = root;
349 
350         /* first of all, try to synthesize a Unicode charmap */
351         charmap.platform_id = TT_PLATFORM_MICROSOFT;
352         charmap.encoding_id = TT_MS_ID_UNICODE_CS;
353         charmap.encoding    = FT_ENCODING_UNICODE;
354 
355         error = FT_CMap_New( cmap_classes->unicode, NULL, &charmap, NULL );
356         if ( error                                      &&
357              FT_ERR_NEQ( error, No_Unicode_Glyph_Name ) )
358           goto Exit;
359         error = FT_Err_Ok;
360 
361         /* now, generate an Adobe Standard encoding when appropriate */
362         charmap.platform_id = TT_PLATFORM_ADOBE;
363         clazz               = NULL;
364 
365         switch ( type1->encoding_type )
366         {
367         case T1_ENCODING_TYPE_STANDARD:
368           charmap.encoding    = FT_ENCODING_ADOBE_STANDARD;
369           charmap.encoding_id = TT_ADOBE_ID_STANDARD;
370           clazz               = cmap_classes->standard;
371           break;
372 
373         case T1_ENCODING_TYPE_EXPERT:
374           charmap.encoding    = FT_ENCODING_ADOBE_EXPERT;
375           charmap.encoding_id = TT_ADOBE_ID_EXPERT;
376           clazz               = cmap_classes->expert;
377           break;
378 
379         case T1_ENCODING_TYPE_ARRAY:
380           charmap.encoding    = FT_ENCODING_ADOBE_CUSTOM;
381           charmap.encoding_id = TT_ADOBE_ID_CUSTOM;
382           clazz               = cmap_classes->custom;
383           break;
384 
385         case T1_ENCODING_TYPE_ISOLATIN1:
386           charmap.encoding    = FT_ENCODING_ADOBE_LATIN_1;
387           charmap.encoding_id = TT_ADOBE_ID_LATIN_1;
388           clazz               = cmap_classes->unicode;
389           break;
390 
391         default:
392           ;
393         }
394 
395         if ( clazz )
396           error = FT_CMap_New( clazz, NULL, &charmap, NULL );
397       }
398     }
399   Exit:
400     return error;
401   }
402 
403 
404   FT_LOCAL_DEF( void )
T42_Face_Done(FT_Face t42face)405   T42_Face_Done( FT_Face  t42face )
406   {
407     T42_Face     face = (T42_Face)t42face;
408     T1_Font      type1;
409     PS_FontInfo  info;
410     FT_Memory    memory;
411 
412 
413     if ( !face )
414       return;
415 
416     type1  = &face->type1;
417     info   = &type1->font_info;
418     memory = face->root.memory;
419 
420     /* delete internal ttf face prior to freeing face->ttf_data */
421     if ( face->ttf_face )
422       FT_Done_Face( face->ttf_face );
423 
424     /* release font info strings */
425     FT_FREE( info->version );
426     FT_FREE( info->notice );
427     FT_FREE( info->full_name );
428     FT_FREE( info->family_name );
429     FT_FREE( info->weight );
430 
431     /* release top dictionary */
432     FT_FREE( type1->charstrings_len );
433     FT_FREE( type1->charstrings );
434     FT_FREE( type1->glyph_names );
435 
436     FT_FREE( type1->charstrings_block );
437     FT_FREE( type1->glyph_names_block );
438 
439     FT_FREE( type1->encoding.char_index );
440     FT_FREE( type1->encoding.char_name );
441     FT_FREE( type1->font_name );
442 
443     FT_FREE( face->ttf_data );
444 
445 #if 0
446     /* release afm data if present */
447     if ( face->afm_data )
448       T1_Done_AFM( memory, (T1_AFM*)face->afm_data );
449 #endif
450 
451     /* release unicode map, if any */
452     FT_FREE( face->unicode_map.maps );
453     face->unicode_map.num_maps = 0;
454 
455     face->root.family_name = NULL;
456     face->root.style_name  = NULL;
457   }
458 
459 
460   /*************************************************************************/
461   /*                                                                       */
462   /* <Function>                                                            */
463   /*    T42_Driver_Init                                                    */
464   /*                                                                       */
465   /* <Description>                                                         */
466   /*    Initializes a given Type 42 driver object.                         */
467   /*                                                                       */
468   /* <Input>                                                               */
469   /*    driver :: A handle to the target driver object.                    */
470   /*                                                                       */
471   /* <Return>                                                              */
472   /*    FreeType error code.  0 means success.                             */
473   /*                                                                       */
474   FT_LOCAL_DEF( FT_Error )
T42_Driver_Init(FT_Module module)475   T42_Driver_Init( FT_Module  module )        /* T42_Driver */
476   {
477     T42_Driver  driver = (T42_Driver)module;
478     FT_Module   ttmodule;
479 
480 
481     ttmodule = FT_Get_Module( module->library, "truetype" );
482     if ( !ttmodule )
483     {
484       FT_ERROR(( "T42_Driver_Init: cannot access `truetype' module\n" ));
485       return FT_THROW( Missing_Module );
486     }
487 
488     driver->ttclazz = (FT_Driver_Class)ttmodule->clazz;
489 
490     return FT_Err_Ok;
491   }
492 
493 
494   FT_LOCAL_DEF( void )
T42_Driver_Done(FT_Module module)495   T42_Driver_Done( FT_Module  module )
496   {
497     FT_UNUSED( module );
498   }
499 
500 
501   FT_LOCAL_DEF( FT_Error )
T42_Size_Init(FT_Size size)502   T42_Size_Init( FT_Size  size )         /* T42_Size */
503   {
504     T42_Size  t42size = (T42_Size)size;
505     FT_Face   face    = size->face;
506     T42_Face  t42face = (T42_Face)face;
507     FT_Size   ttsize;
508     FT_Error  error;
509 
510 
511     error = FT_New_Size( t42face->ttf_face, &ttsize );
512     t42size->ttsize = ttsize;
513 
514     FT_Activate_Size( ttsize );
515 
516     return error;
517   }
518 
519 
520   FT_LOCAL_DEF( FT_Error )
T42_Size_Request(FT_Size t42size,FT_Size_Request req)521   T42_Size_Request( FT_Size          t42size,      /* T42_Size */
522                     FT_Size_Request  req )
523   {
524     T42_Size  size = (T42_Size)t42size;
525     T42_Face  face = (T42_Face)t42size->face;
526     FT_Error  error;
527 
528 
529     FT_Activate_Size( size->ttsize );
530 
531     error = FT_Request_Size( face->ttf_face, req );
532     if ( !error )
533       t42size->metrics = face->ttf_face->size->metrics;
534 
535     return error;
536   }
537 
538 
539   FT_LOCAL_DEF( FT_Error )
T42_Size_Select(FT_Size t42size,FT_ULong strike_index)540   T42_Size_Select( FT_Size   t42size,         /* T42_Size */
541                    FT_ULong  strike_index )
542   {
543     T42_Size  size = (T42_Size)t42size;
544     T42_Face  face = (T42_Face)t42size->face;
545     FT_Error  error;
546 
547 
548     FT_Activate_Size( size->ttsize );
549 
550     error = FT_Select_Size( face->ttf_face, (FT_Int)strike_index );
551     if ( !error )
552       t42size->metrics = face->ttf_face->size->metrics;
553 
554     return error;
555 
556   }
557 
558 
559   FT_LOCAL_DEF( void )
T42_Size_Done(FT_Size t42size)560   T42_Size_Done( FT_Size  t42size )             /* T42_Size */
561   {
562     T42_Size     size    = (T42_Size)t42size;
563     FT_Face      face    = t42size->face;
564     T42_Face     t42face = (T42_Face)face;
565     FT_ListNode  node;
566 
567 
568     node = FT_List_Find( &t42face->ttf_face->sizes_list, size->ttsize );
569     if ( node )
570     {
571       FT_Done_Size( size->ttsize );
572       size->ttsize = NULL;
573     }
574   }
575 
576 
577   FT_LOCAL_DEF( FT_Error )
T42_GlyphSlot_Init(FT_GlyphSlot t42slot)578   T42_GlyphSlot_Init( FT_GlyphSlot  t42slot )        /* T42_GlyphSlot */
579   {
580     T42_GlyphSlot  slot    = (T42_GlyphSlot)t42slot;
581     FT_Face        face    = t42slot->face;
582     T42_Face       t42face = (T42_Face)face;
583     FT_GlyphSlot   ttslot;
584     FT_Error       error   = FT_Err_Ok;
585 
586 
587     if ( !face->glyph )
588     {
589       /* First glyph slot for this face */
590       slot->ttslot = t42face->ttf_face->glyph;
591     }
592     else
593     {
594       error = FT_New_GlyphSlot( t42face->ttf_face, &ttslot );
595       slot->ttslot = ttslot;
596     }
597 
598     return error;
599   }
600 
601 
602   FT_LOCAL_DEF( void )
T42_GlyphSlot_Done(FT_GlyphSlot t42slot)603   T42_GlyphSlot_Done( FT_GlyphSlot  t42slot )       /* T42_GlyphSlot */
604   {
605     T42_GlyphSlot  slot = (T42_GlyphSlot)t42slot;
606 
607 
608     FT_Done_GlyphSlot( slot->ttslot );
609   }
610 
611 
612   static void
t42_glyphslot_clear(FT_GlyphSlot slot)613   t42_glyphslot_clear( FT_GlyphSlot  slot )
614   {
615     /* free bitmap if needed */
616     ft_glyphslot_free_bitmap( slot );
617 
618     /* clear all public fields in the glyph slot */
619     FT_ZERO( &slot->metrics );
620     FT_ZERO( &slot->outline );
621     FT_ZERO( &slot->bitmap );
622 
623     slot->bitmap_left   = 0;
624     slot->bitmap_top    = 0;
625     slot->num_subglyphs = 0;
626     slot->subglyphs     = NULL;
627     slot->control_data  = NULL;
628     slot->control_len   = 0;
629     slot->other         = NULL;
630     slot->format        = FT_GLYPH_FORMAT_NONE;
631 
632     slot->linearHoriAdvance = 0;
633     slot->linearVertAdvance = 0;
634   }
635 
636 
637   FT_LOCAL_DEF( FT_Error )
T42_GlyphSlot_Load(FT_GlyphSlot glyph,FT_Size size,FT_UInt glyph_index,FT_Int32 load_flags)638   T42_GlyphSlot_Load( FT_GlyphSlot  glyph,
639                       FT_Size       size,
640                       FT_UInt       glyph_index,
641                       FT_Int32      load_flags )
642   {
643     FT_Error         error;
644     T42_GlyphSlot    t42slot = (T42_GlyphSlot)glyph;
645     T42_Size         t42size = (T42_Size)size;
646     T42_Face         t42face = (T42_Face)size->face;
647     FT_Driver_Class  ttclazz = ((T42_Driver)glyph->face->driver)->ttclazz;
648 
649 
650     FT_TRACE1(( "T42_GlyphSlot_Load: glyph index %d\n", glyph_index ));
651 
652     /* map T42 glyph index to embedded TTF's glyph index */
653     glyph_index = (FT_UInt)ft_strtol(
654                     (const char *)t42face->type1.charstrings[glyph_index],
655                     NULL, 10 );
656 
657     t42_glyphslot_clear( t42slot->ttslot );
658     error = ttclazz->load_glyph( t42slot->ttslot,
659                                  t42size->ttsize,
660                                  glyph_index,
661                                  load_flags | FT_LOAD_NO_BITMAP );
662 
663     if ( !error )
664     {
665       glyph->metrics = t42slot->ttslot->metrics;
666 
667       glyph->linearHoriAdvance = t42slot->ttslot->linearHoriAdvance;
668       glyph->linearVertAdvance = t42slot->ttslot->linearVertAdvance;
669 
670       glyph->format  = t42slot->ttslot->format;
671       glyph->outline = t42slot->ttslot->outline;
672 
673       glyph->bitmap      = t42slot->ttslot->bitmap;
674       glyph->bitmap_left = t42slot->ttslot->bitmap_left;
675       glyph->bitmap_top  = t42slot->ttslot->bitmap_top;
676 
677       glyph->num_subglyphs = t42slot->ttslot->num_subglyphs;
678       glyph->subglyphs     = t42slot->ttslot->subglyphs;
679 
680       glyph->control_data  = t42slot->ttslot->control_data;
681       glyph->control_len   = t42slot->ttslot->control_len;
682     }
683 
684     return error;
685   }
686 
687 
688 /* END */
689