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comparison mupdf-source/thirdparty/harfbuzz/src/hb-ot-cff2-table.hh @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
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 #ifndef HB_OT_CFF2_TABLE_HH
28 #define HB_OT_CFF2_TABLE_HH
29
30 #include "hb-ot-cff-common.hh"
31 #include "hb-subset-cff2.hh"
32 #include "hb-draw.hh"
33
34 namespace CFF {
35
36 /*
37 * CFF2 -- Compact Font Format (CFF) Version 2
38 * https://docs.microsoft.com/en-us/typography/opentype/spec/cff2
39 */
40 #define HB_OT_TAG_cff2 HB_TAG('C','F','F','2')
41
42 typedef CFFIndex<HBUINT32> CFF2Index;
43 template <typename Type> struct CFF2IndexOf : CFFIndexOf<HBUINT32, Type> {};
44
45 typedef CFF2Index CFF2CharStrings;
46 typedef Subrs<HBUINT32> CFF2Subrs;
47
48 typedef FDSelect3_4<HBUINT32, HBUINT16> FDSelect4;
49 typedef FDSelect3_4_Range<HBUINT32, HBUINT16> FDSelect4_Range;
50
51 struct CFF2FDSelect
52 {
53 bool serialize (hb_serialize_context_t *c, const CFF2FDSelect &src, unsigned int num_glyphs)
54 {
55 TRACE_SERIALIZE (this);
56 unsigned int size = src.get_size (num_glyphs);
57 CFF2FDSelect *dest = c->allocate_size<CFF2FDSelect> (size);
58 if (unlikely (!dest)) return_trace (false);
59 hb_memcpy (dest, &src, size);
60 return_trace (true);
61 }
62
63 unsigned int get_size (unsigned int num_glyphs) const
64 {
65 switch (format)
66 {
67 case 0: return format.static_size + u.format0.get_size (num_glyphs);
68 case 3: return format.static_size + u.format3.get_size ();
69 case 4: return format.static_size + u.format4.get_size ();
70 default:return 0;
71 }
72 }
73
74 hb_codepoint_t get_fd (hb_codepoint_t glyph) const
75 {
76 if (this == &Null (CFF2FDSelect))
77 return 0;
78
79 switch (format)
80 {
81 case 0: return u.format0.get_fd (glyph);
82 case 3: return u.format3.get_fd (glyph);
83 case 4: return u.format4.get_fd (glyph);
84 default:return 0;
85 }
86 }
87
88 bool sanitize (hb_sanitize_context_t *c, unsigned int fdcount) const
89 {
90 TRACE_SANITIZE (this);
91 if (unlikely (!c->check_struct (this)))
92 return_trace (false);
93
94 switch (format)
95 {
96 case 0: return_trace (u.format0.sanitize (c, fdcount));
97 case 3: return_trace (u.format3.sanitize (c, fdcount));
98 case 4: return_trace (u.format4.sanitize (c, fdcount));
99 default:return_trace (false);
100 }
101 }
102
103 HBUINT8 format;
104 union {
105 FDSelect0 format0;
106 FDSelect3 format3;
107 FDSelect4 format4;
108 } u;
109 public:
110 DEFINE_SIZE_MIN (2);
111 };
112
113 struct CFF2VariationStore
114 {
115 bool sanitize (hb_sanitize_context_t *c) const
116 {
117 TRACE_SANITIZE (this);
118 return_trace (likely (c->check_struct (this)) && c->check_range (&varStore, size) && varStore.sanitize (c));
119 }
120
121 bool serialize (hb_serialize_context_t *c, const CFF2VariationStore *varStore)
122 {
123 TRACE_SERIALIZE (this);
124 unsigned int size_ = varStore->get_size ();
125 CFF2VariationStore *dest = c->allocate_size<CFF2VariationStore> (size_);
126 if (unlikely (!dest)) return_trace (false);
127 hb_memcpy (dest, varStore, size_);
128 return_trace (true);
129 }
130
131 unsigned int get_size () const { return HBUINT16::static_size + size; }
132
133 HBUINT16 size;
134 VariationStore varStore;
135
136 DEFINE_SIZE_MIN (2 + VariationStore::min_size);
137 };
138
139 struct cff2_top_dict_values_t : top_dict_values_t<>
140 {
141 void init ()
142 {
143 top_dict_values_t<>::init ();
144 vstoreOffset = 0;
145 FDSelectOffset = 0;
146 }
147 void fini () { top_dict_values_t<>::fini (); }
148
149 unsigned int vstoreOffset;
150 unsigned int FDSelectOffset;
151 };
152
153 struct cff2_top_dict_opset_t : top_dict_opset_t<>
154 {
155 static void process_op (op_code_t op, num_interp_env_t& env, cff2_top_dict_values_t& dictval)
156 {
157 switch (op) {
158 case OpCode_FontMatrix:
159 {
160 dict_val_t val;
161 val.init ();
162 dictval.add_op (op, env.str_ref);
163 env.clear_args ();
164 }
165 break;
166
167 case OpCode_vstore:
168 dictval.vstoreOffset = env.argStack.pop_uint ();
169 env.clear_args ();
170 break;
171 case OpCode_FDSelect:
172 dictval.FDSelectOffset = env.argStack.pop_uint ();
173 env.clear_args ();
174 break;
175
176 default:
177 SUPER::process_op (op, env, dictval);
178 /* Record this operand below if stack is empty, otherwise done */
179 if (!env.argStack.is_empty ()) return;
180 }
181
182 if (unlikely (env.in_error ())) return;
183
184 dictval.add_op (op, env.str_ref);
185 }
186
187 typedef top_dict_opset_t<> SUPER;
188 };
189
190 struct cff2_font_dict_values_t : dict_values_t<op_str_t>
191 {
192 void init ()
193 {
194 dict_values_t<op_str_t>::init ();
195 privateDictInfo.init ();
196 }
197 void fini () { dict_values_t<op_str_t>::fini (); }
198
199 table_info_t privateDictInfo;
200 };
201
202 struct cff2_font_dict_opset_t : dict_opset_t
203 {
204 static void process_op (op_code_t op, num_interp_env_t& env, cff2_font_dict_values_t& dictval)
205 {
206 switch (op) {
207 case OpCode_Private:
208 dictval.privateDictInfo.offset = env.argStack.pop_uint ();
209 dictval.privateDictInfo.size = env.argStack.pop_uint ();
210 env.clear_args ();
211 break;
212
213 default:
214 SUPER::process_op (op, env);
215 if (!env.argStack.is_empty ())
216 return;
217 }
218
219 if (unlikely (env.in_error ())) return;
220
221 dictval.add_op (op, env.str_ref);
222 }
223
224 private:
225 typedef dict_opset_t SUPER;
226 };
227
228 template <typename VAL>
229 struct cff2_private_dict_values_base_t : dict_values_t<VAL>
230 {
231 void init ()
232 {
233 dict_values_t<VAL>::init ();
234 subrsOffset = 0;
235 localSubrs = &Null (CFF2Subrs);
236 ivs = 0;
237 }
238 void fini () { dict_values_t<VAL>::fini (); }
239
240 unsigned int subrsOffset;
241 const CFF2Subrs *localSubrs;
242 unsigned int ivs;
243 };
244
245 typedef cff2_private_dict_values_base_t<op_str_t> cff2_private_dict_values_subset_t;
246 typedef cff2_private_dict_values_base_t<num_dict_val_t> cff2_private_dict_values_t;
247
248 struct cff2_priv_dict_interp_env_t : num_interp_env_t
249 {
250 cff2_priv_dict_interp_env_t (const hb_ubytes_t &str) :
251 num_interp_env_t (str) {}
252
253 void process_vsindex ()
254 {
255 if (likely (!seen_vsindex))
256 {
257 set_ivs (argStack.pop_uint ());
258 }
259 seen_vsindex = true;
260 }
261
262 unsigned int get_ivs () const { return ivs; }
263 void set_ivs (unsigned int ivs_) { ivs = ivs_; }
264
265 protected:
266 unsigned int ivs = 0;
267 bool seen_vsindex = false;
268 };
269
270 struct cff2_private_dict_opset_t : dict_opset_t
271 {
272 static void process_op (op_code_t op, cff2_priv_dict_interp_env_t& env, cff2_private_dict_values_t& dictval)
273 {
274 num_dict_val_t val;
275 val.init ();
276
277 switch (op) {
278 case OpCode_StdHW:
279 case OpCode_StdVW:
280 case OpCode_BlueScale:
281 case OpCode_BlueShift:
282 case OpCode_BlueFuzz:
283 case OpCode_ExpansionFactor:
284 case OpCode_LanguageGroup:
285 val.single_val = env.argStack.pop_num ();
286 env.clear_args ();
287 break;
288 case OpCode_BlueValues:
289 case OpCode_OtherBlues:
290 case OpCode_FamilyBlues:
291 case OpCode_FamilyOtherBlues:
292 case OpCode_StemSnapH:
293 case OpCode_StemSnapV:
294 env.clear_args ();
295 break;
296 case OpCode_Subrs:
297 dictval.subrsOffset = env.argStack.pop_uint ();
298 env.clear_args ();
299 break;
300 case OpCode_vsindexdict:
301 env.process_vsindex ();
302 dictval.ivs = env.get_ivs ();
303 env.clear_args ();
304 break;
305 case OpCode_blenddict:
306 break;
307
308 default:
309 dict_opset_t::process_op (op, env);
310 if (!env.argStack.is_empty ()) return;
311 break;
312 }
313
314 if (unlikely (env.in_error ())) return;
315
316 dictval.add_op (op, env.str_ref, val);
317 }
318 };
319
320 struct cff2_private_dict_opset_subset_t : dict_opset_t
321 {
322 static void process_op (op_code_t op, cff2_priv_dict_interp_env_t& env, cff2_private_dict_values_subset_t& dictval)
323 {
324 switch (op) {
325 case OpCode_BlueValues:
326 case OpCode_OtherBlues:
327 case OpCode_FamilyBlues:
328 case OpCode_FamilyOtherBlues:
329 case OpCode_StdHW:
330 case OpCode_StdVW:
331 case OpCode_BlueScale:
332 case OpCode_BlueShift:
333 case OpCode_BlueFuzz:
334 case OpCode_StemSnapH:
335 case OpCode_StemSnapV:
336 case OpCode_LanguageGroup:
337 case OpCode_ExpansionFactor:
338 env.clear_args ();
339 break;
340
341 case OpCode_blenddict:
342 env.clear_args ();
343 return;
344
345 case OpCode_Subrs:
346 dictval.subrsOffset = env.argStack.pop_uint ();
347 env.clear_args ();
348 break;
349
350 default:
351 SUPER::process_op (op, env);
352 if (!env.argStack.is_empty ()) return;
353 break;
354 }
355
356 if (unlikely (env.in_error ())) return;
357
358 dictval.add_op (op, env.str_ref);
359 }
360
361 private:
362 typedef dict_opset_t SUPER;
363 };
364
365 typedef dict_interpreter_t<cff2_top_dict_opset_t, cff2_top_dict_values_t> cff2_top_dict_interpreter_t;
366 typedef dict_interpreter_t<cff2_font_dict_opset_t, cff2_font_dict_values_t> cff2_font_dict_interpreter_t;
367
368 struct CFF2FDArray : FDArray<HBUINT32>
369 {
370 /* FDArray::serialize does not compile without this partial specialization */
371 template <typename ITER, typename OP_SERIALIZER>
372 bool serialize (hb_serialize_context_t *c, ITER it, OP_SERIALIZER& opszr)
373 { return FDArray<HBUINT32>::serialize<cff2_font_dict_values_t, table_info_t> (c, it, opszr); }
374 };
375
376 } /* namespace CFF */
377
378 namespace OT {
379
380 using namespace CFF;
381
382 struct cff2
383 {
384 static constexpr hb_tag_t tableTag = HB_OT_TAG_cff2;
385
386 bool sanitize (hb_sanitize_context_t *c) const
387 {
388 TRACE_SANITIZE (this);
389 return_trace (c->check_struct (this) &&
390 likely (version.major == 2));
391 }
392
393 template <typename PRIVOPSET, typename PRIVDICTVAL>
394 struct accelerator_templ_t
395 {
396 accelerator_templ_t (hb_face_t *face)
397 {
398 topDict.init ();
399 fontDicts.init ();
400 privateDicts.init ();
401
402 this->blob = sc.reference_table<cff2> (face);
403
404 /* setup for run-time santization */
405 sc.init (this->blob);
406 sc.start_processing ();
407
408 const OT::cff2 *cff2 = this->blob->template as<OT::cff2> ();
409
410 if (cff2 == &Null (OT::cff2))
411 goto fail;
412
413 { /* parse top dict */
414 hb_ubytes_t topDictStr = (cff2 + cff2->topDict).as_ubytes (cff2->topDictSize);
415 if (unlikely (!topDictStr.sanitize (&sc))) goto fail;
416 num_interp_env_t env (topDictStr);
417 cff2_top_dict_interpreter_t top_interp (env);
418 topDict.init ();
419 if (unlikely (!top_interp.interpret (topDict))) goto fail;
420 }
421
422 globalSubrs = &StructAtOffset<CFF2Subrs> (cff2, cff2->topDict + cff2->topDictSize);
423 varStore = &StructAtOffsetOrNull<CFF2VariationStore> (cff2, topDict.vstoreOffset);
424 charStrings = &StructAtOffsetOrNull<CFF2CharStrings> (cff2, topDict.charStringsOffset);
425 fdArray = &StructAtOffsetOrNull<CFF2FDArray> (cff2, topDict.FDArrayOffset);
426 fdSelect = &StructAtOffsetOrNull<CFF2FDSelect> (cff2, topDict.FDSelectOffset);
427
428 if (((varStore != &Null (CFF2VariationStore)) && unlikely (!varStore->sanitize (&sc))) ||
429 (charStrings == &Null (CFF2CharStrings)) || unlikely (!charStrings->sanitize (&sc)) ||
430 (globalSubrs == &Null (CFF2Subrs)) || unlikely (!globalSubrs->sanitize (&sc)) ||
431 (fdArray == &Null (CFF2FDArray)) || unlikely (!fdArray->sanitize (&sc)) ||
432 (((fdSelect != &Null (CFF2FDSelect)) && unlikely (!fdSelect->sanitize (&sc, fdArray->count)))))
433 goto fail;
434
435 num_glyphs = charStrings->count;
436 if (num_glyphs != sc.get_num_glyphs ())
437 goto fail;
438
439 fdCount = fdArray->count;
440 if (!privateDicts.resize (fdCount))
441 goto fail;
442
443 /* parse font dicts and gather private dicts */
444 for (unsigned int i = 0; i < fdCount; i++)
445 {
446 const hb_ubytes_t fontDictStr = (*fdArray)[i];
447 if (unlikely (!fontDictStr.sanitize (&sc))) goto fail;
448 cff2_font_dict_values_t *font;
449 num_interp_env_t env (fontDictStr);
450 cff2_font_dict_interpreter_t font_interp (env);
451 font = fontDicts.push ();
452 if (unlikely (font == &Crap (cff2_font_dict_values_t))) goto fail;
453 font->init ();
454 if (unlikely (!font_interp.interpret (*font))) goto fail;
455
456 const hb_ubytes_t privDictStr = StructAtOffsetOrNull<UnsizedByteStr> (cff2, font->privateDictInfo.offset).as_ubytes (font->privateDictInfo.size);
457 if (unlikely (!privDictStr.sanitize (&sc))) goto fail;
458 cff2_priv_dict_interp_env_t env2 (privDictStr);
459 dict_interpreter_t<PRIVOPSET, PRIVDICTVAL, cff2_priv_dict_interp_env_t> priv_interp (env2);
460 privateDicts[i].init ();
461 if (unlikely (!priv_interp.interpret (privateDicts[i]))) goto fail;
462
463 privateDicts[i].localSubrs = &StructAtOffsetOrNull<CFF2Subrs> (&privDictStr[0], privateDicts[i].subrsOffset);
464 if (privateDicts[i].localSubrs != &Null (CFF2Subrs) &&
465 unlikely (!privateDicts[i].localSubrs->sanitize (&sc)))
466 goto fail;
467 }
468
469
470 return;
471
472 fail:
473 _fini ();
474 }
475 ~accelerator_templ_t () { _fini (); }
476 void _fini ()
477 {
478 sc.end_processing ();
479 topDict.fini ();
480 fontDicts.fini ();
481 privateDicts.fini ();
482 hb_blob_destroy (blob);
483 blob = nullptr;
484 }
485
486 hb_map_t *create_glyph_to_sid_map () const
487 {
488 return nullptr;
489 }
490
491 bool is_valid () const { return blob; }
492
493 protected:
494 hb_sanitize_context_t sc;
495
496 public:
497 hb_blob_t *blob = nullptr;
498 cff2_top_dict_values_t topDict;
499 const CFF2Subrs *globalSubrs = nullptr;
500 const CFF2VariationStore *varStore = nullptr;
501 const CFF2CharStrings *charStrings = nullptr;
502 const CFF2FDArray *fdArray = nullptr;
503 const CFF2FDSelect *fdSelect = nullptr;
504 unsigned int fdCount = 0;
505
506 hb_vector_t<cff2_font_dict_values_t> fontDicts;
507 hb_vector_t<PRIVDICTVAL> privateDicts;
508
509 unsigned int num_glyphs = 0;
510 };
511
512 struct accelerator_t : accelerator_templ_t<cff2_private_dict_opset_t, cff2_private_dict_values_t>
513 {
514 accelerator_t (hb_face_t *face) : accelerator_templ_t (face) {}
515
516 HB_INTERNAL bool get_extents (hb_font_t *font,
517 hb_codepoint_t glyph,
518 hb_glyph_extents_t *extents) const;
519 HB_INTERNAL bool get_path (hb_font_t *font, hb_codepoint_t glyph, hb_draw_session_t &draw_session) const;
520 };
521
522 typedef accelerator_templ_t<cff2_private_dict_opset_subset_t, cff2_private_dict_values_subset_t> accelerator_subset_t;
523
524 bool subset (hb_subset_context_t *c) const { return hb_subset_cff2 (c); }
525
526 public:
527 FixedVersion<HBUINT8> version; /* Version of CFF2 table. set to 0x0200u */
528 NNOffsetTo<TopDict, HBUINT8> topDict; /* headerSize = Offset to Top DICT. */
529 HBUINT16 topDictSize; /* Top DICT size */
530
531 public:
532 DEFINE_SIZE_STATIC (5);
533 };
534
535 struct cff2_accelerator_t : cff2::accelerator_t {
536 cff2_accelerator_t (hb_face_t *face) : cff2::accelerator_t (face) {}
537 };
538
539 } /* namespace OT */
540
541 #endif /* HB_OT_CFF2_TABLE_HH */