1 /****************************************************************************
2 *
3 * t42objs.c
4 *
5 * Type 42 objects manager (body).
6 *
7 * Copyright (C) 2002-2023 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 <freetype/internal/ftdebug.h>
23 #include <freetype/ftlist.h>
24 #include <freetype/ttnameid.h>
25
26
27 #undef FT_COMPONENT
28 #define FT_COMPONENT 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 face->ttf_data = NULL;
48 face->ttf_size = 0;
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 = FT_THROW( 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 = FT_THROW( 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 = NULL;
90 loader.glyph_names.elements = NULL;
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
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 const FT_String* char_name =
111 (const FT_String*)loader.encoding_table.elements[charcode];
112
113
114 type1->encoding.char_index[charcode] = 0;
115 type1->encoding.char_name [charcode] = ".notdef";
116
117 if ( char_name )
118 for ( idx = 0; idx < type1->num_glyphs; idx++ )
119 {
120 const FT_String* glyph_name = type1->glyph_names[idx];
121
122
123 if ( ft_strcmp( char_name, glyph_name ) == 0 )
124 {
125 type1->encoding.char_index[charcode] = (FT_UShort)idx;
126 type1->encoding.char_name [charcode] = glyph_name;
127
128 /* Change min/max encoded char only if glyph name is */
129 /* not /.notdef */
130 if ( ft_strcmp( ".notdef", glyph_name ) != 0 )
131 {
132 if ( charcode < min_char )
133 min_char = charcode;
134 if ( charcode >= max_char )
135 max_char = charcode + 1;
136 }
137 break;
138 }
139 }
140 }
141
142 type1->encoding.code_first = min_char;
143 type1->encoding.code_last = max_char;
144 type1->encoding.num_chars = loader.num_chars;
145 }
146
147 Exit:
148 t42_loader_done( &loader );
149 if ( error )
150 {
151 FT_FREE( face->ttf_data );
152 face->ttf_size = 0;
153 }
154 return error;
155 }
156
157
158 /***************** Driver Functions *************/
159
160
161 FT_LOCAL_DEF( FT_Error )
162 T42_Face_Init( FT_Stream stream,
163 FT_Face t42face, /* T42_Face */
164 FT_Int face_index,
165 FT_Int num_params,
166 FT_Parameter* params )
167 {
168 T42_Face face = (T42_Face)t42face;
169 FT_Error error;
170 FT_Service_PsCMaps psnames;
171 PSAux_Service psaux;
172 FT_Face root = (FT_Face)&face->root;
173 T1_Font type1 = &face->type1;
174 PS_FontInfo info = &type1->font_info;
175
176 FT_UNUSED( num_params );
177 FT_UNUSED( params );
178 FT_UNUSED( stream );
179
180
181 face->ttf_face = NULL;
182 face->root.num_faces = 1;
183
184 FT_FACE_FIND_GLOBAL_SERVICE( face, psnames, POSTSCRIPT_CMAPS );
185 face->psnames = psnames;
186
187 face->psaux = FT_Get_Module_Interface( FT_FACE_LIBRARY( face ),
188 "psaux" );
189 psaux = (PSAux_Service)face->psaux;
190 if ( !psaux )
191 {
192 FT_ERROR(( "T42_Face_Init: cannot access `psaux' module\n" ));
193 error = FT_THROW( Missing_Module );
194 goto Exit;
195 }
196
197 FT_TRACE2(( "Type 42 driver\n" ));
198
199 /* open the tokenizer, this will also check the font format */
200 error = T42_Open_Face( face );
201 if ( error )
202 goto Exit;
203
204 /* if we just wanted to check the format, leave successfully now */
205 if ( face_index < 0 )
206 goto Exit;
207
208 /* check the face index */
209 if ( ( face_index & 0xFFFF ) > 0 )
210 {
211 FT_ERROR(( "T42_Face_Init: invalid face index\n" ));
212 error = FT_THROW( Invalid_Argument );
213 goto Exit;
214 }
215
216 /* Now load the font program into the face object */
217
218 /* Init the face object fields */
219 /* Now set up root face fields */
220
221 root->num_glyphs = type1->num_glyphs;
222 root->num_charmaps = 0;
223 root->face_index = 0;
224
225 root->face_flags |= FT_FACE_FLAG_SCALABLE |
226 FT_FACE_FLAG_HORIZONTAL |
227 FT_FACE_FLAG_GLYPH_NAMES;
228
229 if ( info->is_fixed_pitch )
230 root->face_flags |= FT_FACE_FLAG_FIXED_WIDTH;
231
232 #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
233 root->face_flags |= FT_FACE_FLAG_HINTER;
234 #endif
235
236 /* XXX: TODO -- add kerning with .afm support */
237
238 /* get style name -- be careful, some broken fonts only */
239 /* have a `/FontName' dictionary entry! */
240 root->family_name = info->family_name;
241 /* assume "Regular" style if we don't know better */
242 root->style_name = (char *)"Regular";
243 if ( root->family_name )
244 {
245 char* full = info->full_name;
246 char* family = root->family_name;
247
248
249 if ( full )
250 {
251 while ( *full )
252 {
253 if ( *full == *family )
254 {
255 family++;
256 full++;
257 }
258 else
259 {
260 if ( *full == ' ' || *full == '-' )
261 full++;
262 else if ( *family == ' ' || *family == '-' )
263 family++;
264 else
265 {
266 if ( !*family )
267 root->style_name = full;
268 break;
269 }
270 }
271 }
272 }
273 }
274 else
275 {
276 /* do we have a `/FontName'? */
277 if ( type1->font_name )
278 root->family_name = type1->font_name;
279 }
280
281 /* no embedded bitmap support */
282 root->num_fixed_sizes = 0;
283 root->available_sizes = NULL;
284
285 /* Load the TTF font embedded in the T42 font */
286 {
287 FT_Open_Args args;
288
289
290 args.flags = FT_OPEN_MEMORY | FT_OPEN_DRIVER;
291 args.driver = FT_Get_Module( FT_FACE_LIBRARY( face ),
292 "truetype" );
293 args.memory_base = face->ttf_data;
294 args.memory_size = face->ttf_size;
295
296 if ( num_params )
297 {
298 args.flags |= FT_OPEN_PARAMS;
299 args.num_params = num_params;
300 args.params = params;
301 }
302
303 error = FT_Open_Face( FT_FACE_LIBRARY( face ),
304 &args, 0, &face->ttf_face );
305 }
306
307 if ( error )
308 goto Exit;
309
310 FT_Done_Size( face->ttf_face->size );
311
312 /* Ignore info in FontInfo dictionary and use the info from the */
313 /* loaded TTF font. The PostScript interpreter also ignores it. */
314 root->bbox = face->ttf_face->bbox;
315 root->units_per_EM = face->ttf_face->units_per_EM;
316
317 root->ascender = face->ttf_face->ascender;
318 root->descender = face->ttf_face->descender;
319 root->height = face->ttf_face->height;
320
321 root->max_advance_width = face->ttf_face->max_advance_width;
322 root->max_advance_height = face->ttf_face->max_advance_height;
323
324 root->underline_position = (FT_Short)info->underline_position;
325 root->underline_thickness = (FT_Short)info->underline_thickness;
326
327 /* compute style flags */
328 root->style_flags = 0;
329 if ( info->italic_angle )
330 root->style_flags |= FT_STYLE_FLAG_ITALIC;
331
332 if ( face->ttf_face->style_flags & FT_STYLE_FLAG_BOLD )
333 root->style_flags |= FT_STYLE_FLAG_BOLD;
334
335 if ( face->ttf_face->face_flags & FT_FACE_FLAG_VERTICAL )
336 root->face_flags |= FT_FACE_FLAG_VERTICAL;
337
338 {
339 if ( psnames )
340 {
341 FT_CharMapRec charmap;
342 T1_CMap_Classes cmap_classes = psaux->t1_cmap_classes;
343 FT_CMap_Class clazz;
344
345
346 charmap.face = root;
347
348 /* first of all, try to synthesize a Unicode charmap */
349 charmap.platform_id = TT_PLATFORM_MICROSOFT;
350 charmap.encoding_id = TT_MS_ID_UNICODE_CS;
351 charmap.encoding = FT_ENCODING_UNICODE;
352
353 error = FT_CMap_New( cmap_classes->unicode, NULL, &charmap, NULL );
354 if ( error &&
355 FT_ERR_NEQ( error, No_Unicode_Glyph_Name ) &&
356 FT_ERR_NEQ( error, Unimplemented_Feature ) )
357 goto Exit;
358 error = FT_Err_Ok;
359
360 /* now, generate an Adobe Standard encoding when appropriate */
361 charmap.platform_id = TT_PLATFORM_ADOBE;
362 clazz = NULL;
363
364 switch ( type1->encoding_type )
365 {
366 case T1_ENCODING_TYPE_STANDARD:
367 charmap.encoding = FT_ENCODING_ADOBE_STANDARD;
368 charmap.encoding_id = TT_ADOBE_ID_STANDARD;
369 clazz = cmap_classes->standard;
370 break;
371
372 case T1_ENCODING_TYPE_EXPERT:
373 charmap.encoding = FT_ENCODING_ADOBE_EXPERT;
374 charmap.encoding_id = TT_ADOBE_ID_EXPERT;
375 clazz = cmap_classes->expert;
376 break;
377
378 case T1_ENCODING_TYPE_ARRAY:
379 charmap.encoding = FT_ENCODING_ADOBE_CUSTOM;
380 charmap.encoding_id = TT_ADOBE_ID_CUSTOM;
381 clazz = cmap_classes->custom;
382 break;
383
384 case T1_ENCODING_TYPE_ISOLATIN1:
385 charmap.encoding = FT_ENCODING_ADOBE_LATIN_1;
386 charmap.encoding_id = TT_ADOBE_ID_LATIN_1;
387 clazz = cmap_classes->unicode;
388 break;
389
390 default:
391 ;
392 }
393
394 if ( clazz )
395 error = FT_CMap_New( clazz, NULL, &charmap, NULL );
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 = NULL;
455 face->root.style_name = NULL;
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 ::
469 * A handle to the target driver object.
470 *
471 * @Return:
472 * FreeType error code. 0 means success.
473 */
474 FT_LOCAL_DEF( FT_Error )
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 )
495 T42_Driver_Done( FT_Module module )
496 {
497 FT_UNUSED( module );
498 }
499
500
501 FT_LOCAL_DEF( FT_Error )
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 if ( !error )
513 t42size->ttsize = ttsize;
514
515 FT_Activate_Size( ttsize );
516
517 return error;
518 }
519
520
521 FT_LOCAL_DEF( FT_Error )
522 T42_Size_Request( FT_Size t42size, /* T42_Size */
523 FT_Size_Request req )
524 {
525 T42_Size size = (T42_Size)t42size;
526 T42_Face face = (T42_Face)t42size->face;
527 FT_Error error;
528
529
530 FT_Activate_Size( size->ttsize );
531
532 error = FT_Request_Size( face->ttf_face, req );
533 if ( !error )
534 t42size->metrics = face->ttf_face->size->metrics;
535
536 return error;
537 }
538
539
540 FT_LOCAL_DEF( FT_Error )
541 T42_Size_Select( FT_Size t42size, /* T42_Size */
542 FT_ULong strike_index )
543 {
544 T42_Size size = (T42_Size)t42size;
545 T42_Face face = (T42_Face)t42size->face;
546 FT_Error error;
547
548
549 FT_Activate_Size( size->ttsize );
550
551 error = FT_Select_Size( face->ttf_face, (FT_Int)strike_index );
552 if ( !error )
553 t42size->metrics = face->ttf_face->size->metrics;
554
555 return error;
556
557 }
558
559
560 FT_LOCAL_DEF( void )
561 T42_Size_Done( FT_Size t42size ) /* T42_Size */
562 {
563 T42_Size size = (T42_Size)t42size;
564 FT_Face face = t42size->face;
565 T42_Face t42face = (T42_Face)face;
566 FT_ListNode node;
567
568
569 node = FT_List_Find( &t42face->ttf_face->sizes_list, size->ttsize );
570 if ( node )
571 {
572 FT_Done_Size( size->ttsize );
573 size->ttsize = NULL;
574 }
575 }
576
577
578 FT_LOCAL_DEF( FT_Error )
579 T42_GlyphSlot_Init( FT_GlyphSlot t42slot ) /* T42_GlyphSlot */
580 {
581 T42_GlyphSlot slot = (T42_GlyphSlot)t42slot;
582 FT_Face face = t42slot->face;
583 T42_Face t42face = (T42_Face)face;
584 FT_GlyphSlot ttslot;
585 FT_Memory memory = face->memory;
586 FT_Error error = FT_Err_Ok;
587
588
589 if ( !face->glyph )
590 {
591 /* First glyph slot for this face */
592 slot->ttslot = t42face->ttf_face->glyph;
593 }
594 else
595 {
596 error = FT_New_GlyphSlot( t42face->ttf_face, &ttslot );
597 if ( !error )
598 slot->ttslot = ttslot;
599 }
600
601 /* share the loader so that the autohinter can see it */
602 FT_GlyphLoader_Done( slot->ttslot->internal->loader );
603 FT_FREE( slot->ttslot->internal );
604 slot->ttslot->internal = t42slot->internal;
605
606 return error;
607 }
608
609
610 FT_LOCAL_DEF( void )
611 T42_GlyphSlot_Done( FT_GlyphSlot t42slot ) /* T42_GlyphSlot */
612 {
613 T42_GlyphSlot slot = (T42_GlyphSlot)t42slot;
614
615
616 /* do not destroy the inherited internal structure just yet */
617 slot->ttslot->internal = NULL;
618 FT_Done_GlyphSlot( slot->ttslot );
619 }
620
621
622 static void
623 t42_glyphslot_clear( FT_GlyphSlot slot )
624 {
625 /* free bitmap if needed */
626 ft_glyphslot_free_bitmap( slot );
627
628 /* clear all public fields in the glyph slot */
629 FT_ZERO( &slot->metrics );
630 FT_ZERO( &slot->outline );
631 FT_ZERO( &slot->bitmap );
632
633 slot->bitmap_left = 0;
634 slot->bitmap_top = 0;
635 slot->num_subglyphs = 0;
636 slot->subglyphs = NULL;
637 slot->control_data = NULL;
638 slot->control_len = 0;
639 slot->other = NULL;
640 slot->format = FT_GLYPH_FORMAT_NONE;
641
642 slot->linearHoriAdvance = 0;
643 slot->linearVertAdvance = 0;
644 }
645
646
647 FT_LOCAL_DEF( FT_Error )
648 T42_GlyphSlot_Load( FT_GlyphSlot glyph,
649 FT_Size size,
650 FT_UInt glyph_index,
651 FT_Int32 load_flags )
652 {
653 FT_Error error;
654 T42_GlyphSlot t42slot = (T42_GlyphSlot)glyph;
655 T42_Size t42size = (T42_Size)size;
656 T42_Face t42face = (T42_Face)size->face;
657 FT_Driver_Class ttclazz = ((T42_Driver)glyph->face->driver)->ttclazz;
658
659
660 FT_TRACE1(( "T42_GlyphSlot_Load: glyph index %d\n", glyph_index ));
661
662 /* map T42 glyph index to embedded TTF's glyph index */
663 glyph_index = (FT_UInt)ft_strtol(
664 (const char *)t42face->type1.charstrings[glyph_index],
665 NULL, 10 );
666
667 t42_glyphslot_clear( t42slot->ttslot );
668 error = ttclazz->load_glyph( t42slot->ttslot,
669 t42size->ttsize,
670 glyph_index,
671 load_flags | FT_LOAD_NO_BITMAP );
672
673 if ( !error )
674 {
675 glyph->metrics = t42slot->ttslot->metrics;
676
677 glyph->linearHoriAdvance = t42slot->ttslot->linearHoriAdvance;
678 glyph->linearVertAdvance = t42slot->ttslot->linearVertAdvance;
679
680 glyph->format = t42slot->ttslot->format;
681 glyph->outline = t42slot->ttslot->outline;
682
683 glyph->bitmap = t42slot->ttslot->bitmap;
684 glyph->bitmap_left = t42slot->ttslot->bitmap_left;
685 glyph->bitmap_top = t42slot->ttslot->bitmap_top;
686
687 glyph->num_subglyphs = t42slot->ttslot->num_subglyphs;
688 glyph->subglyphs = t42slot->ttslot->subglyphs;
689
690 glyph->control_data = t42slot->ttslot->control_data;
691 glyph->control_len = t42slot->ttslot->control_len;
692 }
693
694 return error;
695 }
696
697
698 /* END */