1 /*
2 * Copyright © 2018 Adobe Inc.
3 *
4 * This is part of HarfBuzz, a text shaping library.
5 *
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
11 *
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
16 * DAMAGE.
17 *
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
23 *
24 * Adobe Author(s): Michiharu Ariza
25 */
26
27 #include "hb.hh"
28
29 #ifndef HB_NO_SUBSET_CFF
30
31 #include "hb-open-type.hh"
32 #include "hb-ot-cff1-table.hh"
33 #include "hb-set.h"
34 #include "hb-bimap.hh"
35 #include "hb-subset-cff1.hh"
36 #include "hb-subset-plan.hh"
37 #include "hb-subset-cff-common.hh"
38 #include "hb-cff1-interp-cs.hh"
39
40 using namespace CFF;
41
42 struct remap_sid_t : hb_inc_bimap_t
43 {
addremap_sid_t44 unsigned int add (unsigned int sid)
45 {
46 if ((sid != CFF_UNDEF_SID) && !is_std_std (sid))
47 return offset_sid (hb_inc_bimap_t::add (unoffset_sid (sid)));
48 else
49 return sid;
50 }
51
operator []remap_sid_t52 unsigned int operator[] (unsigned int sid) const
53 {
54 if (is_std_std (sid) || (sid == CFF_UNDEF_SID))
55 return sid;
56 else
57 return offset_sid (get (unoffset_sid (sid)));
58 }
59
60 static const unsigned int num_std_strings = 391;
61
is_std_stdremap_sid_t62 static bool is_std_std (unsigned int sid) { return sid < num_std_strings; }
offset_sidremap_sid_t63 static unsigned int offset_sid (unsigned int sid) { return sid + num_std_strings; }
unoffset_sidremap_sid_t64 static unsigned int unoffset_sid (unsigned int sid) { return sid - num_std_strings; }
65 };
66
67 struct cff1_sub_table_info_t : cff_sub_table_info_t
68 {
cff1_sub_table_info_tcff1_sub_table_info_t69 cff1_sub_table_info_t ()
70 : cff_sub_table_info_t (),
71 encoding_link (0),
72 charset_link (0)
73 {
74 privateDictInfo.init ();
75 }
76
77 objidx_t encoding_link;
78 objidx_t charset_link;
79 table_info_t privateDictInfo;
80 };
81
82 /* a copy of a parsed out cff1_top_dict_values_t augmented with additional operators */
83 struct cff1_top_dict_values_mod_t : cff1_top_dict_values_t
84 {
initcff1_top_dict_values_mod_t85 void init (const cff1_top_dict_values_t *base_= &Null (cff1_top_dict_values_t))
86 {
87 SUPER::init ();
88 base = base_;
89 }
90
finicff1_top_dict_values_mod_t91 void fini () { SUPER::fini (); }
92
get_countcff1_top_dict_values_mod_t93 unsigned get_count () const { return base->get_count () + SUPER::get_count (); }
get_valuecff1_top_dict_values_mod_t94 const cff1_top_dict_val_t &get_value (unsigned int i) const
95 {
96 if (i < base->get_count ())
97 return (*base)[i];
98 else
99 return SUPER::values[i - base->get_count ()];
100 }
operator []cff1_top_dict_values_mod_t101 const cff1_top_dict_val_t &operator [] (unsigned int i) const { return get_value (i); }
102
reassignSIDscff1_top_dict_values_mod_t103 void reassignSIDs (const remap_sid_t& sidmap)
104 {
105 for (unsigned int i = 0; i < name_dict_values_t::ValCount; i++)
106 nameSIDs[i] = sidmap[base->nameSIDs[i]];
107 }
108
109 protected:
110 typedef cff1_top_dict_values_t SUPER;
111 const cff1_top_dict_values_t *base;
112 };
113
114 struct top_dict_modifiers_t
115 {
top_dict_modifiers_ttop_dict_modifiers_t116 top_dict_modifiers_t (const cff1_sub_table_info_t &info_,
117 const unsigned int (&nameSIDs_)[name_dict_values_t::ValCount])
118 : info (info_),
119 nameSIDs (nameSIDs_)
120 {}
121
122 const cff1_sub_table_info_t &info;
123 const unsigned int (&nameSIDs)[name_dict_values_t::ValCount];
124 };
125
126 struct cff1_top_dict_op_serializer_t : cff_top_dict_op_serializer_t<cff1_top_dict_val_t>
127 {
serializecff1_top_dict_op_serializer_t128 bool serialize (hb_serialize_context_t *c,
129 const cff1_top_dict_val_t &opstr,
130 const top_dict_modifiers_t &mod) const
131 {
132 TRACE_SERIALIZE (this);
133
134 op_code_t op = opstr.op;
135 switch (op)
136 {
137 case OpCode_charset:
138 if (mod.info.charset_link)
139 return_trace (FontDict::serialize_link4_op(c, op, mod.info.charset_link, whence_t::Absolute));
140 else
141 goto fall_back;
142
143 case OpCode_Encoding:
144 if (mod.info.encoding_link)
145 return_trace (FontDict::serialize_link4_op(c, op, mod.info.encoding_link, whence_t::Absolute));
146 else
147 goto fall_back;
148
149 case OpCode_Private:
150 return_trace (UnsizedByteStr::serialize_int2 (c, mod.info.privateDictInfo.size) &&
151 Dict::serialize_link4_op (c, op, mod.info.privateDictInfo.link, whence_t::Absolute));
152
153 case OpCode_version:
154 case OpCode_Notice:
155 case OpCode_Copyright:
156 case OpCode_FullName:
157 case OpCode_FamilyName:
158 case OpCode_Weight:
159 case OpCode_PostScript:
160 case OpCode_BaseFontName:
161 case OpCode_FontName:
162 return_trace (FontDict::serialize_int2_op (c, op, mod.nameSIDs[name_dict_values_t::name_op_to_index (op)]));
163
164 case OpCode_ROS:
165 {
166 /* for registry & ordering, reassigned SIDs are serialized
167 * for supplement, the original byte string is copied along with the op code */
168 op_str_t supp_op;
169 supp_op.op = op;
170 if ( unlikely (!(opstr.str.length >= opstr.last_arg_offset + 3)))
171 return_trace (false);
172 supp_op.str = byte_str_t (&opstr.str + opstr.last_arg_offset, opstr.str.length - opstr.last_arg_offset);
173 return_trace (UnsizedByteStr::serialize_int2 (c, mod.nameSIDs[name_dict_values_t::registry]) &&
174 UnsizedByteStr::serialize_int2 (c, mod.nameSIDs[name_dict_values_t::ordering]) &&
175 copy_opstr (c, supp_op));
176 }
177 fall_back:
178 default:
179 return_trace (cff_top_dict_op_serializer_t<cff1_top_dict_val_t>::serialize (c, opstr, mod.info));
180 }
181 return_trace (true);
182 }
183
184 };
185
186 struct cff1_font_dict_op_serializer_t : cff_font_dict_op_serializer_t
187 {
serializecff1_font_dict_op_serializer_t188 bool serialize (hb_serialize_context_t *c,
189 const op_str_t &opstr,
190 const cff1_font_dict_values_mod_t &mod) const
191 {
192 TRACE_SERIALIZE (this);
193
194 if (opstr.op == OpCode_FontName)
195 return_trace (FontDict::serialize_int2_op (c, opstr.op, mod.fontName));
196 else
197 return_trace (SUPER::serialize (c, opstr, mod.privateDictInfo));
198 }
199
200 private:
201 typedef cff_font_dict_op_serializer_t SUPER;
202 };
203
204 struct cff1_cs_opset_flatten_t : cff1_cs_opset_t<cff1_cs_opset_flatten_t, flatten_param_t>
205 {
flush_args_and_opcff1_cs_opset_flatten_t206 static void flush_args_and_op (op_code_t op, cff1_cs_interp_env_t &env, flatten_param_t& param)
207 {
208 if (env.arg_start > 0)
209 flush_width (env, param);
210
211 switch (op)
212 {
213 case OpCode_hstem:
214 case OpCode_hstemhm:
215 case OpCode_vstem:
216 case OpCode_vstemhm:
217 case OpCode_hintmask:
218 case OpCode_cntrmask:
219 case OpCode_dotsection:
220 if (param.drop_hints)
221 {
222 env.clear_args ();
223 return;
224 }
225 HB_FALLTHROUGH;
226
227 default:
228 SUPER::flush_args_and_op (op, env, param);
229 break;
230 }
231 }
flush_argscff1_cs_opset_flatten_t232 static void flush_args (cff1_cs_interp_env_t &env, flatten_param_t& param)
233 {
234 str_encoder_t encoder (param.flatStr);
235 for (unsigned int i = env.arg_start; i < env.argStack.get_count (); i++)
236 encoder.encode_num (env.eval_arg (i));
237 SUPER::flush_args (env, param);
238 }
239
flush_opcff1_cs_opset_flatten_t240 static void flush_op (op_code_t op, cff1_cs_interp_env_t &env, flatten_param_t& param)
241 {
242 str_encoder_t encoder (param.flatStr);
243 encoder.encode_op (op);
244 }
245
flush_widthcff1_cs_opset_flatten_t246 static void flush_width (cff1_cs_interp_env_t &env, flatten_param_t& param)
247 {
248 assert (env.has_width);
249 str_encoder_t encoder (param.flatStr);
250 encoder.encode_num (env.width);
251 }
252
flush_hintmaskcff1_cs_opset_flatten_t253 static void flush_hintmask (op_code_t op, cff1_cs_interp_env_t &env, flatten_param_t& param)
254 {
255 SUPER::flush_hintmask (op, env, param);
256 if (!param.drop_hints)
257 {
258 str_encoder_t encoder (param.flatStr);
259 for (unsigned int i = 0; i < env.hintmask_size; i++)
260 encoder.encode_byte (env.str_ref[i]);
261 }
262 }
263
264 private:
265 typedef cff1_cs_opset_t<cff1_cs_opset_flatten_t, flatten_param_t> SUPER;
266 };
267
268 struct range_list_t : hb_vector_t<code_pair_t>
269 {
270 /* replace the first glyph ID in the "glyph" field each range with a nLeft value */
completerange_list_t271 bool complete (unsigned int last_glyph)
272 {
273 bool two_byte = false;
274 for (unsigned int i = (*this).length; i > 0; i--)
275 {
276 code_pair_t &pair = (*this)[i - 1];
277 unsigned int nLeft = last_glyph - pair.glyph - 1;
278 if (nLeft >= 0x100)
279 two_byte = true;
280 last_glyph = pair.glyph;
281 pair.glyph = nLeft;
282 }
283 return two_byte;
284 }
285 };
286
287 struct cff1_cs_opset_subr_subset_t : cff1_cs_opset_t<cff1_cs_opset_subr_subset_t, subr_subset_param_t>
288 {
process_opcff1_cs_opset_subr_subset_t289 static void process_op (op_code_t op, cff1_cs_interp_env_t &env, subr_subset_param_t& param)
290 {
291 switch (op) {
292
293 case OpCode_return:
294 param.current_parsed_str->add_op (op, env.str_ref);
295 param.current_parsed_str->set_parsed ();
296 env.return_from_subr ();
297 param.set_current_str (env, false);
298 break;
299
300 case OpCode_endchar:
301 param.current_parsed_str->add_op (op, env.str_ref);
302 param.current_parsed_str->set_parsed ();
303 SUPER::process_op (op, env, param);
304 break;
305
306 case OpCode_callsubr:
307 process_call_subr (op, CSType_LocalSubr, env, param, env.localSubrs, param.local_closure);
308 break;
309
310 case OpCode_callgsubr:
311 process_call_subr (op, CSType_GlobalSubr, env, param, env.globalSubrs, param.global_closure);
312 break;
313
314 default:
315 SUPER::process_op (op, env, param);
316 param.current_parsed_str->add_op (op, env.str_ref);
317 break;
318 }
319 }
320
321 protected:
process_call_subrcff1_cs_opset_subr_subset_t322 static void process_call_subr (op_code_t op, cs_type_t type,
323 cff1_cs_interp_env_t &env, subr_subset_param_t& param,
324 cff1_biased_subrs_t& subrs, hb_set_t *closure)
325 {
326 byte_str_ref_t str_ref = env.str_ref;
327 env.call_subr (subrs, type);
328 param.current_parsed_str->add_call_op (op, str_ref, env.context.subr_num);
329 closure->add (env.context.subr_num);
330 param.set_current_str (env, true);
331 }
332
333 private:
334 typedef cff1_cs_opset_t<cff1_cs_opset_subr_subset_t, subr_subset_param_t> SUPER;
335 };
336
337 struct cff1_subr_subsetter_t : subr_subsetter_t<cff1_subr_subsetter_t, CFF1Subrs, const OT::cff1::accelerator_subset_t, cff1_cs_interp_env_t, cff1_cs_opset_subr_subset_t, OpCode_endchar>
338 {
cff1_subr_subsetter_tcff1_subr_subsetter_t339 cff1_subr_subsetter_t (const OT::cff1::accelerator_subset_t &acc_, const hb_subset_plan_t *plan_)
340 : subr_subsetter_t (acc_, plan_) {}
341
complete_parsed_strcff1_subr_subsetter_t342 static void complete_parsed_str (cff1_cs_interp_env_t &env, subr_subset_param_t& param, parsed_cs_str_t &charstring)
343 {
344 /* insert width at the beginning of the charstring as necessary */
345 if (env.has_width)
346 charstring.set_prefix (env.width);
347
348 /* subroutines/charstring left on the call stack are legally left unmarked
349 * unmarked when a subroutine terminates with endchar. mark them.
350 */
351 param.current_parsed_str->set_parsed ();
352 for (unsigned int i = 0; i < env.callStack.get_count (); i++)
353 {
354 parsed_cs_str_t *parsed_str = param.get_parsed_str_for_context (env.callStack[i]);
355 if (likely (parsed_str))
356 parsed_str->set_parsed ();
357 else
358 env.set_error ();
359 }
360 }
361 };
362
363 struct cff_subset_plan {
cff_subset_plancff_subset_plan364 cff_subset_plan ()
365 : info (),
366 orig_fdcount (0),
367 subset_fdcount (1),
368 subset_fdselect_format (0),
369 drop_hints (false),
370 desubroutinize(false)
371 {
372 topdict_mod.init ();
373 subset_fdselect_ranges.init ();
374 fdmap.init ();
375 subset_charstrings.init ();
376 subset_globalsubrs.init ();
377 subset_localsubrs.init ();
378 fontdicts_mod.init ();
379 subset_enc_code_ranges.init ();
380 subset_enc_supp_codes.init ();
381 subset_charset_ranges.init ();
382 sidmap.init ();
383 for (unsigned int i = 0; i < name_dict_values_t::ValCount; i++)
384 topDictModSIDs[i] = CFF_UNDEF_SID;
385 }
386
~cff_subset_plancff_subset_plan387 ~cff_subset_plan ()
388 {
389 topdict_mod.fini ();
390 subset_fdselect_ranges.fini ();
391 fdmap.fini ();
392 subset_charstrings.fini_deep ();
393 subset_globalsubrs.fini_deep ();
394 subset_localsubrs.fini_deep ();
395 fontdicts_mod.fini ();
396 subset_enc_code_ranges.fini ();
397 subset_enc_supp_codes.fini ();
398 subset_charset_ranges.fini ();
399 sidmap.fini ();
400 }
401
plan_subset_encodingcff_subset_plan402 void plan_subset_encoding (const OT::cff1::accelerator_subset_t &acc, hb_subset_plan_t *plan)
403 {
404 const Encoding *encoding = acc.encoding;
405 unsigned int size0, size1;
406 hb_codepoint_t code, last_code = CFF_UNDEF_CODE;
407 hb_vector_t<hb_codepoint_t> supp_codes;
408
409 if (unlikely (!subset_enc_code_ranges.resize (0)))
410 {
411 plan->check_success (false);
412 return;
413 }
414
415 supp_codes.init ();
416
417 subset_enc_num_codes = plan->num_output_glyphs () - 1;
418 unsigned int glyph;
419 for (glyph = 1; glyph < plan->num_output_glyphs (); glyph++)
420 {
421 hb_codepoint_t old_glyph;
422 if (!plan->old_gid_for_new_gid (glyph, &old_glyph))
423 {
424 /* Retain the code for the old missing glyph ID */
425 old_glyph = glyph;
426 }
427 code = acc.glyph_to_code (old_glyph);
428 if (code == CFF_UNDEF_CODE)
429 {
430 subset_enc_num_codes = glyph - 1;
431 break;
432 }
433
434 if ((last_code == CFF_UNDEF_CODE) || (code != last_code + 1))
435 {
436 code_pair_t pair = { code, glyph };
437 subset_enc_code_ranges.push (pair);
438 }
439 last_code = code;
440
441 if (encoding != &Null (Encoding))
442 {
443 hb_codepoint_t sid = acc.glyph_to_sid (old_glyph);
444 encoding->get_supplement_codes (sid, supp_codes);
445 for (unsigned int i = 0; i < supp_codes.length; i++)
446 {
447 code_pair_t pair = { supp_codes[i], sid };
448 subset_enc_supp_codes.push (pair);
449 }
450 }
451 }
452 supp_codes.fini ();
453
454 subset_enc_code_ranges.complete (glyph);
455
456 assert (subset_enc_num_codes <= 0xFF);
457 size0 = Encoding0::min_size + HBUINT8::static_size * subset_enc_num_codes;
458 size1 = Encoding1::min_size + Encoding1_Range::static_size * subset_enc_code_ranges.length;
459
460 if (size0 < size1)
461 subset_enc_format = 0;
462 else
463 subset_enc_format = 1;
464 }
465
plan_subset_charsetcff_subset_plan466 void plan_subset_charset (const OT::cff1::accelerator_subset_t &acc, hb_subset_plan_t *plan)
467 {
468 unsigned int size0, size_ranges;
469 hb_codepoint_t sid, last_sid = CFF_UNDEF_CODE;
470
471 if (unlikely (!subset_charset_ranges.resize (0)))
472 {
473 plan->check_success (false);
474 return;
475 }
476
477 unsigned int glyph;
478 for (glyph = 1; glyph < plan->num_output_glyphs (); glyph++)
479 {
480 hb_codepoint_t old_glyph;
481 if (!plan->old_gid_for_new_gid (glyph, &old_glyph))
482 {
483 /* Retain the SID for the old missing glyph ID */
484 old_glyph = glyph;
485 }
486 sid = acc.glyph_to_sid (old_glyph);
487
488 if (!acc.is_CID ())
489 sid = sidmap.add (sid);
490
491 if ((last_sid == CFF_UNDEF_CODE) || (sid != last_sid + 1))
492 {
493 code_pair_t pair = { sid, glyph };
494 subset_charset_ranges.push (pair);
495 }
496 last_sid = sid;
497 }
498
499 bool two_byte = subset_charset_ranges.complete (glyph);
500
501 size0 = Charset0::min_size + HBUINT16::static_size * (plan->num_output_glyphs () - 1);
502 if (!two_byte)
503 size_ranges = Charset1::min_size + Charset1_Range::static_size * subset_charset_ranges.length;
504 else
505 size_ranges = Charset2::min_size + Charset2_Range::static_size * subset_charset_ranges.length;
506
507 if (size0 < size_ranges)
508 subset_charset_format = 0;
509 else if (!two_byte)
510 subset_charset_format = 1;
511 else
512 subset_charset_format = 2;
513 }
514
collect_sids_in_dictscff_subset_plan515 bool collect_sids_in_dicts (const OT::cff1::accelerator_subset_t &acc)
516 {
517 sidmap.reset ();
518
519 for (unsigned int i = 0; i < name_dict_values_t::ValCount; i++)
520 {
521 unsigned int sid = acc.topDict.nameSIDs[i];
522 if (sid != CFF_UNDEF_SID)
523 {
524 (void)sidmap.add (sid);
525 topDictModSIDs[i] = sidmap[sid];
526 }
527 }
528
529 if (acc.fdArray != &Null (CFF1FDArray))
530 for (unsigned int i = 0; i < orig_fdcount; i++)
531 if (fdmap.has (i))
532 (void)sidmap.add (acc.fontDicts[i].fontName);
533
534 return true;
535 }
536
createcff_subset_plan537 bool create (const OT::cff1::accelerator_subset_t &acc,
538 hb_subset_plan_t *plan)
539 {
540 /* make sure notdef is first */
541 hb_codepoint_t old_glyph;
542 if (!plan->old_gid_for_new_gid (0, &old_glyph) || (old_glyph != 0)) return false;
543
544 num_glyphs = plan->num_output_glyphs ();
545 orig_fdcount = acc.fdCount;
546 drop_hints = plan->flags & HB_SUBSET_FLAGS_NO_HINTING;
547 desubroutinize = plan->flags & HB_SUBSET_FLAGS_DESUBROUTINIZE;
548
549 /* check whether the subset renumbers any glyph IDs */
550 gid_renum = false;
551 for (hb_codepoint_t new_glyph = 0; new_glyph < plan->num_output_glyphs (); new_glyph++)
552 {
553 if (!plan->old_gid_for_new_gid(new_glyph, &old_glyph))
554 continue;
555 if (new_glyph != old_glyph) {
556 gid_renum = true;
557 break;
558 }
559 }
560
561 subset_charset = gid_renum || !acc.is_predef_charset ();
562 subset_encoding = !acc.is_CID() && !acc.is_predef_encoding ();
563
564 /* top dict INDEX */
565 {
566 /* Add encoding/charset to a (copy of) top dict as necessary */
567 topdict_mod.init (&acc.topDict);
568 bool need_to_add_enc = (subset_encoding && !acc.topDict.has_op (OpCode_Encoding));
569 bool need_to_add_set = (subset_charset && !acc.topDict.has_op (OpCode_charset));
570 if (need_to_add_enc || need_to_add_set)
571 {
572 if (need_to_add_enc)
573 topdict_mod.add_op (OpCode_Encoding);
574 if (need_to_add_set)
575 topdict_mod.add_op (OpCode_charset);
576 }
577 }
578
579 /* Determine re-mapping of font index as fdmap among other info */
580 if (acc.fdSelect != &Null (CFF1FDSelect))
581 {
582 if (unlikely (!hb_plan_subset_cff_fdselect (plan,
583 orig_fdcount,
584 *acc.fdSelect,
585 subset_fdcount,
586 info.fd_select.size,
587 subset_fdselect_format,
588 subset_fdselect_ranges,
589 fdmap)))
590 return false;
591 }
592 else
593 fdmap.identity (1);
594
595 /* remove unused SIDs & reassign SIDs */
596 {
597 /* SIDs for name strings in dicts are added before glyph names so they fit in 16-bit int range */
598 if (unlikely (!collect_sids_in_dicts (acc)))
599 return false;
600 if (unlikely (sidmap.get_population () > 0x8000)) /* assumption: a dict won't reference that many strings */
601 return false;
602
603 if (subset_charset) plan_subset_charset (acc, plan);
604
605 topdict_mod.reassignSIDs (sidmap);
606 }
607
608 if (desubroutinize)
609 {
610 /* Flatten global & local subrs */
611 subr_flattener_t<const OT::cff1::accelerator_subset_t, cff1_cs_interp_env_t, cff1_cs_opset_flatten_t, OpCode_endchar>
612 flattener(acc, plan);
613 if (!flattener.flatten (subset_charstrings))
614 return false;
615 }
616 else
617 {
618 cff1_subr_subsetter_t subr_subsetter (acc, plan);
619
620 /* Subset subrs: collect used subroutines, leaving all unused ones behind */
621 if (!subr_subsetter.subset ())
622 return false;
623
624 /* encode charstrings, global subrs, local subrs with new subroutine numbers */
625 if (!subr_subsetter.encode_charstrings (subset_charstrings))
626 return false;
627
628 if (!subr_subsetter.encode_globalsubrs (subset_globalsubrs))
629 return false;
630
631 /* local subrs */
632 if (!subset_localsubrs.resize (orig_fdcount))
633 return false;
634 for (unsigned int fd = 0; fd < orig_fdcount; fd++)
635 {
636 subset_localsubrs[fd].init ();
637 if (fdmap.has (fd))
638 {
639 if (!subr_subsetter.encode_localsubrs (fd, subset_localsubrs[fd]))
640 return false;
641 }
642 }
643 }
644
645 /* Encoding */
646 if (subset_encoding)
647 plan_subset_encoding (acc, plan);
648
649 /* private dicts & local subrs */
650 if (!acc.is_CID ())
651 fontdicts_mod.push (cff1_font_dict_values_mod_t ());
652 else
653 {
654 + hb_iter (acc.fontDicts)
655 | hb_filter ([&] (const cff1_font_dict_values_t &_)
656 { return fdmap.has (&_ - &acc.fontDicts[0]); } )
657 | hb_map ([&] (const cff1_font_dict_values_t &_)
658 {
659 cff1_font_dict_values_mod_t mod;
660 mod.init (&_, sidmap[_.fontName]);
661 return mod;
662 })
663 | hb_sink (fontdicts_mod)
664 ;
665 }
666
667 return ((subset_charstrings.length == plan->num_output_glyphs ())
668 && (fontdicts_mod.length == subset_fdcount));
669 }
670
671 cff1_top_dict_values_mod_t topdict_mod;
672 cff1_sub_table_info_t info;
673
674 unsigned int num_glyphs;
675 unsigned int orig_fdcount;
676 unsigned int subset_fdcount;
677 unsigned int subset_fdselect_format;
678 hb_vector_t<code_pair_t> subset_fdselect_ranges;
679
680 /* font dict index remap table from fullset FDArray to subset FDArray.
681 * set to CFF_UNDEF_CODE if excluded from subset */
682 hb_inc_bimap_t fdmap;
683
684 str_buff_vec_t subset_charstrings;
685 str_buff_vec_t subset_globalsubrs;
686 hb_vector_t<str_buff_vec_t> subset_localsubrs;
687 hb_vector_t<cff1_font_dict_values_mod_t> fontdicts_mod;
688
689 bool drop_hints;
690
691 bool gid_renum;
692 bool subset_encoding;
693 uint8_t subset_enc_format;
694 unsigned int subset_enc_num_codes;
695 range_list_t subset_enc_code_ranges;
696 hb_vector_t<code_pair_t> subset_enc_supp_codes;
697
698 uint8_t subset_charset_format;
699 range_list_t subset_charset_ranges;
700 bool subset_charset;
701
702 remap_sid_t sidmap;
703 unsigned int topDictModSIDs[name_dict_values_t::ValCount];
704
705 bool desubroutinize;
706 };
707
_serialize_cff1(hb_serialize_context_t * c,cff_subset_plan & plan,const OT::cff1::accelerator_subset_t & acc,unsigned int num_glyphs)708 static bool _serialize_cff1 (hb_serialize_context_t *c,
709 cff_subset_plan &plan,
710 const OT::cff1::accelerator_subset_t &acc,
711 unsigned int num_glyphs)
712 {
713 /* private dicts & local subrs */
714 for (int i = (int)acc.privateDicts.length; --i >= 0 ;)
715 {
716 if (plan.fdmap.has (i))
717 {
718 objidx_t subrs_link = 0;
719 if (plan.subset_localsubrs[i].length > 0)
720 {
721 CFF1Subrs *dest = c->start_embed <CFF1Subrs> ();
722 if (unlikely (!dest)) return false;
723 c->push ();
724 if (likely (dest && dest->serialize (c, plan.subset_localsubrs[i])))
725 subrs_link = c->pop_pack ();
726 else
727 {
728 c->pop_discard ();
729 return false;
730 }
731 }
732
733 PrivateDict *pd = c->start_embed<PrivateDict> ();
734 if (unlikely (!pd)) return false;
735 c->push ();
736 cff_private_dict_op_serializer_t privSzr (plan.desubroutinize, plan.drop_hints);
737 /* N.B. local subrs immediately follows its corresponding private dict. i.e., subr offset == private dict size */
738 if (likely (pd->serialize (c, acc.privateDicts[i], privSzr, subrs_link)))
739 {
740 unsigned fd = plan.fdmap[i];
741 plan.fontdicts_mod[fd].privateDictInfo.size = c->length ();
742 plan.fontdicts_mod[fd].privateDictInfo.link = c->pop_pack ();
743 }
744 else
745 {
746 c->pop_discard ();
747 return false;
748 }
749 }
750 }
751
752 if (!acc.is_CID ())
753 plan.info.privateDictInfo = plan.fontdicts_mod[0].privateDictInfo;
754
755 /* CharStrings */
756 {
757 CFF1CharStrings *cs = c->start_embed<CFF1CharStrings> ();
758 if (unlikely (!cs)) return false;
759 c->push ();
760 if (likely (cs->serialize (c, plan.subset_charstrings)))
761 plan.info.char_strings_link = c->pop_pack ();
762 else
763 {
764 c->pop_discard ();
765 return false;
766 }
767 }
768
769 /* FDArray (FD Index) */
770 if (acc.fdArray != &Null (CFF1FDArray))
771 {
772 CFF1FDArray *fda = c->start_embed<CFF1FDArray> ();
773 if (unlikely (!fda)) return false;
774 c->push ();
775 cff1_font_dict_op_serializer_t fontSzr;
776 auto it = + hb_zip (+ hb_iter (plan.fontdicts_mod), + hb_iter (plan.fontdicts_mod));
777 if (likely (fda->serialize (c, it, fontSzr)))
778 plan.info.fd_array_link = c->pop_pack (false);
779 else
780 {
781 c->pop_discard ();
782 return false;
783 }
784 }
785
786 /* FDSelect */
787 if (acc.fdSelect != &Null (CFF1FDSelect))
788 {
789 c->push ();
790 if (likely (hb_serialize_cff_fdselect (c, num_glyphs, *acc.fdSelect, acc.fdCount,
791 plan.subset_fdselect_format, plan.info.fd_select.size,
792 plan.subset_fdselect_ranges)))
793 plan.info.fd_select.link = c->pop_pack ();
794 else
795 {
796 c->pop_discard ();
797 return false;
798 }
799 }
800
801 /* Charset */
802 if (plan.subset_charset)
803 {
804 Charset *dest = c->start_embed<Charset> ();
805 if (unlikely (!dest)) return false;
806 c->push ();
807 if (likely (dest->serialize (c,
808 plan.subset_charset_format,
809 plan.num_glyphs,
810 plan.subset_charset_ranges)))
811 plan.info.charset_link = c->pop_pack ();
812 else
813 {
814 c->pop_discard ();
815 return false;
816 }
817 }
818
819 /* Encoding */
820 if (plan.subset_encoding)
821 {
822 Encoding *dest = c->start_embed<Encoding> ();
823 if (unlikely (!dest)) return false;
824 c->push ();
825 if (likely (dest->serialize (c,
826 plan.subset_enc_format,
827 plan.subset_enc_num_codes,
828 plan.subset_enc_code_ranges,
829 plan.subset_enc_supp_codes)))
830 plan.info.encoding_link = c->pop_pack ();
831 else
832 {
833 c->pop_discard ();
834 return false;
835 }
836 }
837
838 /* global subrs */
839 {
840 c->push ();
841 CFF1Subrs *dest = c->start_embed <CFF1Subrs> ();
842 if (unlikely (!dest)) return false;
843 if (likely (dest->serialize (c, plan.subset_globalsubrs)))
844 c->pop_pack ();
845 else
846 {
847 c->pop_discard ();
848 return false;
849 }
850 }
851
852 /* String INDEX */
853 {
854 CFF1StringIndex *dest = c->start_embed<CFF1StringIndex> ();
855 if (unlikely (!dest)) return false;
856 c->push ();
857 if (likely (dest->serialize (c, *acc.stringIndex, plan.sidmap)))
858 c->pop_pack ();
859 else
860 {
861 c->pop_discard ();
862 return false;
863 }
864 }
865
866 OT::cff1 *cff = c->allocate_min<OT::cff1> ();
867 if (unlikely (!cff))
868 return false;
869
870 /* header */
871 cff->version.major = 0x01;
872 cff->version.minor = 0x00;
873 cff->nameIndex = cff->min_size;
874 cff->offSize = 4; /* unused? */
875
876 /* name INDEX */
877 if (unlikely (!(*acc.nameIndex).copy (c))) return false;
878
879 /* top dict INDEX */
880 {
881 /* serialize singleton TopDict */
882 TopDict *top = c->start_embed<TopDict> ();
883 if (!top) return false;
884 c->push ();
885 cff1_top_dict_op_serializer_t topSzr;
886 unsigned top_size = 0;
887 top_dict_modifiers_t modifier (plan.info, plan.topDictModSIDs);
888 if (likely (top->serialize (c, plan.topdict_mod, topSzr, modifier)))
889 {
890 top_size = c->length ();
891 c->pop_pack (false);
892 }
893 else
894 {
895 c->pop_discard ();
896 return false;
897 }
898 /* serialize INDEX header for above */
899 CFF1Index *dest = c->start_embed<CFF1Index> ();
900 if (!dest) return false;
901 return dest->serialize_header (c, hb_iter (hb_array_t<unsigned> (&top_size, 1)));
902 }
903 }
904
905 static bool
_hb_subset_cff1(const OT::cff1::accelerator_subset_t & acc,hb_subset_context_t * c)906 _hb_subset_cff1 (const OT::cff1::accelerator_subset_t &acc,
907 hb_subset_context_t *c)
908 {
909 cff_subset_plan cff_plan;
910
911 if (unlikely (!cff_plan.create (acc, c->plan)))
912 {
913 DEBUG_MSG(SUBSET, nullptr, "Failed to generate a cff subsetting plan.");
914 return false;
915 }
916
917 return _serialize_cff1 (c->serializer, cff_plan, acc, c->plan->num_output_glyphs ());
918 }
919
920 bool
hb_subset_cff1(hb_subset_context_t * c)921 hb_subset_cff1 (hb_subset_context_t *c)
922 {
923 OT::cff1::accelerator_subset_t acc;
924 acc.init (c->plan->source);
925 bool result = likely (acc.is_valid ()) && _hb_subset_cff1 (acc, c);
926 acc.fini ();
927
928 return result;
929 }
930
931
932 #endif
933