2 * Copyright (C) 2007,2008,2009 Red Hat, Inc.
4 * This is part of HarfBuzz, an OpenType Layout engine library.
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.
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
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.
24 * Red Hat Author(s): Behdad Esfahbod
27 #ifndef HB_OT_LAYOUT_COMMON_PRIVATE_HH
28 #define HB_OT_LAYOUT_COMMON_PRIVATE_HH
30 #include "hb-ot-layout-private.h"
32 #include "hb-open-type-private.hh"
35 #define NO_CONTEXT ((unsigned int) 0x110000)
36 #define NOT_COVERED ((unsigned int) 0x110000)
37 #define MAX_NESTING_LEVEL 8
42 * OpenType Layout Common Table Formats
48 * Script, ScriptList, LangSys, Feature, FeatureList, Lookup, LookupList
51 template <typename Type>
54 static inline unsigned int get_size () { return sizeof (Record<Type>); }
56 inline bool sanitize (SANITIZE_ARG_DEF, const void *base) {
58 return SANITIZE (tag) && SANITIZE_BASE (offset, base);
61 Tag tag; /* 4-byte Tag identifier */
63 offset; /* Offset from beginning of object holding
67 template <typename Type>
68 struct RecordArrayOf : ArrayOf<Record<Type> > {
69 inline const Tag& get_tag (unsigned int i) const
71 if (HB_UNLIKELY (i >= this->len)) return Null(Tag);
72 return (*this)[i].tag;
74 inline unsigned int get_tags (unsigned int start_offset,
75 unsigned int *record_count /* IN/OUT */,
76 hb_tag_t *record_tags /* OUT */) const
79 const Record<Type> *array = this->const_sub_array (start_offset, record_count);
80 unsigned int count = *record_count;
81 for (unsigned int i = 0; i < count; i++)
82 record_tags[i] = array[i].tag;
86 inline bool find_index (hb_tag_t tag, unsigned int *index) const
90 const Record<Type> *a = this->const_array();
91 unsigned int count = this->len;
92 for (unsigned int i = 0; i < count; i++)
96 if (index) *index = i;
100 if (index) *index = NO_INDEX;
105 template <typename Type>
106 struct RecordListOf : RecordArrayOf<Type>
108 inline const Type& operator [] (unsigned int i) const
109 { return this+RecordArrayOf<Type>::operator [](i).offset; }
111 inline bool sanitize (SANITIZE_ARG_DEF) {
113 return RecordArrayOf<Type>::sanitize (SANITIZE_ARG, CONST_CHARP(this));
118 struct IndexArray : ArrayOf<USHORT>
120 inline unsigned int operator [] (unsigned int i) const
122 if (HB_UNLIKELY (i >= this->len))
124 return this->const_array()[i];
126 inline unsigned int get_indexes (unsigned int start_offset,
127 unsigned int *_count /* IN/OUT */,
128 unsigned int *_indexes /* OUT */) const
131 const USHORT *array = this->const_sub_array (start_offset, _count);
132 unsigned int count = *_count;
133 for (unsigned int i = 0; i < count; i++)
134 _indexes[i] = array[i];
148 inline unsigned int get_feature_count (void) const
149 { return featureIndex.len; }
150 inline hb_tag_t get_feature_index (unsigned int i) const
151 { return featureIndex[i]; }
152 inline unsigned int get_feature_indexes (unsigned int start_offset,
153 unsigned int *feature_count /* IN/OUT */,
154 unsigned int *feature_indexes /* OUT */) const
155 { return featureIndex.get_indexes (start_offset, feature_count, feature_indexes); }
157 inline bool has_required_feature (void) const { return reqFeatureIndex != 0xffff; }
158 inline int get_required_feature_index (void) const
160 if (reqFeatureIndex == 0xffff)
162 return reqFeatureIndex;;
165 inline bool sanitize (SANITIZE_ARG_DEF) {
167 return SANITIZE_SELF () && SANITIZE (featureIndex);
170 Offset lookupOrder; /* = Null (reserved for an offset to a
171 * reordering table) */
172 USHORT reqFeatureIndex;/* Index of a feature required for this
173 * language system--if no required features
175 IndexArray featureIndex; /* Array of indices into the FeatureList */
177 ASSERT_SIZE (LangSys, 6);
178 DEFINE_NULL_DATA (LangSys, 6, "\0\0\xFF\xFF");
183 inline unsigned int get_lang_sys_count (void) const
184 { return langSys.len; }
185 inline const Tag& get_lang_sys_tag (unsigned int i) const
186 { return langSys.get_tag (i); }
187 inline unsigned int get_lang_sys_tags (unsigned int start_offset,
188 unsigned int *lang_sys_count /* IN/OUT */,
189 hb_tag_t *lang_sys_tags /* OUT */) const
190 { return langSys.get_tags (start_offset, lang_sys_count, lang_sys_tags); }
191 inline const LangSys& get_lang_sys (unsigned int i) const
193 if (i == NO_INDEX) return get_default_lang_sys ();
194 return this+langSys[i].offset;
196 inline bool find_lang_sys_index (hb_tag_t tag, unsigned int *index) const
197 { return langSys.find_index (tag, index); }
199 inline bool has_default_lang_sys (void) const { return defaultLangSys != 0; }
200 inline const LangSys& get_default_lang_sys (void) const { return this+defaultLangSys; }
202 inline bool sanitize (SANITIZE_ARG_DEF) {
204 return SANITIZE_THIS (defaultLangSys) && SANITIZE_THIS (langSys);
209 defaultLangSys; /* Offset to DefaultLangSys table--from
210 * beginning of Script table--may be Null */
211 RecordArrayOf<LangSys>
212 langSys; /* Array of LangSysRecords--listed
213 * alphabetically by LangSysTag */
215 ASSERT_SIZE (Script, 4);
217 typedef RecordListOf<Script> ScriptList;
218 ASSERT_SIZE (ScriptList, 2);
223 inline unsigned int get_lookup_count (void) const
224 { return lookupIndex.len; }
225 inline hb_tag_t get_lookup_index (unsigned int i) const
226 { return lookupIndex[i]; }
227 inline unsigned int get_lookup_indexes (unsigned int start_index,
228 unsigned int *lookup_count /* IN/OUT */,
229 unsigned int *lookup_tags /* OUT */) const
230 { return lookupIndex.get_indexes (start_index, lookup_count, lookup_tags); }
232 inline bool sanitize (SANITIZE_ARG_DEF) {
234 return SANITIZE_SELF () && SANITIZE (lookupIndex);
237 /* TODO: implement get_feature_parameters() */
238 /* TODO: implement FeatureSize and other special features? */
239 Offset featureParams; /* Offset to Feature Parameters table (if one
240 * has been defined for the feature), relative
241 * to the beginning of the Feature Table; = Null
243 IndexArray lookupIndex; /* Array of LookupList indices */
245 ASSERT_SIZE (Feature, 4);
247 typedef RecordListOf<Feature> FeatureList;
248 ASSERT_SIZE (FeatureList, 2);
251 struct LookupFlag : USHORT
254 RightToLeft = 0x0001u,
255 IgnoreBaseGlyphs = 0x0002u,
256 IgnoreLigatures = 0x0004u,
257 IgnoreMarks = 0x0008u,
258 IgnoreFlags = 0x000Eu,
259 UseMarkFilteringSet = 0x0010u,
261 MarkAttachmentType = 0xFF00u
264 ASSERT_SIZE (LookupFlag, 2);
266 struct LookupSubTable
268 inline bool sanitize (SANITIZE_ARG_DEF) {
270 return SANITIZE_SELF ();
274 USHORT format; /* Subtable format. Different for GSUB and GPOS */
276 ASSERT_SIZE (LookupSubTable, 2);
280 inline const LookupSubTable& get_subtable (unsigned int i) const { return this+subTable[i]; }
281 inline unsigned int get_subtable_count (void) const { return subTable.len; }
283 inline unsigned int get_type (void) const { return lookupType; }
284 inline unsigned int get_flag (void) const
286 unsigned int flag = lookupFlag;
287 if (HB_UNLIKELY (flag & LookupFlag::UseMarkFilteringSet))
289 const USHORT &markFilteringSet = CONST_NEXT (USHORT, subTable);
290 flag += (markFilteringSet << 16);
295 inline bool sanitize (SANITIZE_ARG_DEF) {
297 if (!(SANITIZE (lookupType) && SANITIZE (lookupFlag) && SANITIZE_THIS (subTable))) return false;
298 if (HB_UNLIKELY (lookupFlag & LookupFlag::UseMarkFilteringSet))
300 USHORT &markFilteringSet = NEXT (USHORT, subTable);
301 if (!SANITIZE (markFilteringSet)) return false;
306 USHORT lookupType; /* Different enumerations for GSUB and GPOS */
307 USHORT lookupFlag; /* Lookup qualifiers */
308 OffsetArrayOf<LookupSubTable>
309 subTable; /* Array of SubTables */
310 USHORT markFilteringSetX[VAR]; /* Index (base 0) into GDEF mark glyph sets
311 * structure. This field is only present if bit
312 * UseMarkFilteringSet of lookup flags is set. */
314 ASSERT_SIZE_VAR (Lookup, 6, USHORT);
316 typedef OffsetListOf<Lookup> LookupList;
317 ASSERT_SIZE (LookupList, 2);
324 struct CoverageFormat1
326 friend struct Coverage;
329 inline unsigned int get_coverage (hb_codepoint_t glyph_id) const
331 if (HB_UNLIKELY (glyph_id > 0xFFFF))
336 unsigned int num_glyphs = glyphArray.len;
337 for (unsigned int i = 0; i < num_glyphs; i++)
338 if (gid == glyphArray[i])
343 inline bool sanitize (SANITIZE_ARG_DEF) {
345 return SANITIZE (glyphArray);
349 USHORT coverageFormat; /* Format identifier--format = 1 */
351 glyphArray; /* Array of GlyphIDs--in numerical order */
353 ASSERT_SIZE (CoverageFormat1, 4);
355 struct CoverageRangeRecord
357 friend struct CoverageFormat2;
359 static inline unsigned int get_size () { return sizeof (CoverageRangeRecord); }
362 inline unsigned int get_coverage (hb_codepoint_t glyph_id) const
364 if (glyph_id >= start && glyph_id <= end)
365 return (unsigned int) startCoverageIndex + (glyph_id - start);
370 inline bool sanitize (SANITIZE_ARG_DEF) {
372 return SANITIZE_SELF ();
376 GlyphID start; /* First GlyphID in the range */
377 GlyphID end; /* Last GlyphID in the range */
378 USHORT startCoverageIndex; /* Coverage Index of first GlyphID in
381 ASSERT_SIZE (CoverageRangeRecord, 6);
382 DEFINE_NULL_DATA (CoverageRangeRecord, 6, "\000\001");
384 struct CoverageFormat2
386 friend struct Coverage;
389 inline unsigned int get_coverage (hb_codepoint_t glyph_id) const
392 unsigned int count = rangeRecord.len;
393 for (unsigned int i = 0; i < count; i++)
395 unsigned int coverage = rangeRecord[i].get_coverage (glyph_id);
396 if (coverage != NOT_COVERED)
402 inline bool sanitize (SANITIZE_ARG_DEF) {
404 return SANITIZE (rangeRecord);
408 USHORT coverageFormat; /* Format identifier--format = 2 */
409 ArrayOf<CoverageRangeRecord>
410 rangeRecord; /* Array of glyph ranges--ordered by
411 * Start GlyphID. rangeCount entries
414 ASSERT_SIZE (CoverageFormat2, 4);
418 inline unsigned int operator () (hb_codepoint_t glyph_id) const { return get_coverage (glyph_id); }
420 inline unsigned int get_coverage (hb_codepoint_t glyph_id) const
423 case 1: return u.format1->get_coverage(glyph_id);
424 case 2: return u.format2->get_coverage(glyph_id);
425 default:return NOT_COVERED;
429 inline bool sanitize (SANITIZE_ARG_DEF) {
431 if (!SANITIZE (u.format)) return false;
433 case 1: return u.format1->sanitize (SANITIZE_ARG);
434 case 2: return u.format2->sanitize (SANITIZE_ARG);
441 USHORT format; /* Format identifier */
442 CoverageFormat1 format1[VAR];
443 CoverageFormat2 format2[VAR];
449 * Class Definition Table
452 struct ClassDefFormat1
454 friend struct ClassDef;
457 inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const
459 if ((unsigned int) (glyph_id - startGlyph) < classValue.len)
460 return classValue[glyph_id - startGlyph];
464 inline bool sanitize (SANITIZE_ARG_DEF) {
466 return SANITIZE_SELF () && SANITIZE (classValue);
469 USHORT classFormat; /* Format identifier--format = 1 */
470 GlyphID startGlyph; /* First GlyphID of the classValueArray */
472 classValue; /* Array of Class Values--one per GlyphID */
474 ASSERT_SIZE (ClassDefFormat1, 6);
476 struct ClassRangeRecord
478 friend struct ClassDefFormat2;
480 static inline unsigned int get_size () { return sizeof (ClassRangeRecord); }
483 inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const
485 if (glyph_id >= start && glyph_id <= end)
491 inline bool sanitize (SANITIZE_ARG_DEF) {
493 return SANITIZE_SELF ();
497 GlyphID start; /* First GlyphID in the range */
498 GlyphID end; /* Last GlyphID in the range */
499 USHORT classValue; /* Applied to all glyphs in the range */
501 ASSERT_SIZE (ClassRangeRecord, 6);
502 DEFINE_NULL_DATA (ClassRangeRecord, 6, "\000\001");
504 struct ClassDefFormat2
506 friend struct ClassDef;
509 inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const
512 unsigned int count = rangeRecord.len;
513 for (unsigned int i = 0; i < count; i++)
515 int classValue = rangeRecord[i].get_class (glyph_id);
522 inline bool sanitize (SANITIZE_ARG_DEF) {
524 return SANITIZE (rangeRecord);
527 USHORT classFormat; /* Format identifier--format = 2 */
528 ArrayOf<ClassRangeRecord>
529 rangeRecord; /* Array of glyph ranges--ordered by
532 ASSERT_SIZE (ClassDefFormat2, 4);
536 inline hb_ot_layout_class_t operator () (hb_codepoint_t glyph_id) const { return get_class (glyph_id); }
538 inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const
541 case 1: return u.format1->get_class(glyph_id);
542 case 2: return u.format2->get_class(glyph_id);
547 inline bool sanitize (SANITIZE_ARG_DEF) {
549 if (!SANITIZE (u.format)) return false;
551 case 1: return u.format1->sanitize (SANITIZE_ARG);
552 case 2: return u.format2->sanitize (SANITIZE_ARG);
559 USHORT format; /* Format identifier */
560 ClassDefFormat1 format1[VAR];
561 ClassDefFormat2 format2[VAR];
572 inline int operator () (unsigned int ppem_size) const { return get_delta (ppem_size); }
574 inline int get_delta (unsigned int ppem_size) const
576 unsigned int f = deltaFormat;
577 if (HB_UNLIKELY (f < 1 || f > 3))
580 if (ppem_size < startSize || ppem_size > endSize)
583 unsigned int s = ppem_size - startSize;
585 unsigned int byte = deltaValue[s >> (4 - f)];
586 unsigned int bits = (byte >> (16 - (((s & ((1 << (4 - f)) - 1)) + 1) << f)));
587 unsigned int mask = (0xFFFF >> (16 - (1 << f)));
589 int delta = bits & mask;
591 if ((unsigned int) delta >= ((mask + 1) >> 1))
597 inline unsigned int get_size () const
599 unsigned int f = deltaFormat;
600 if (HB_UNLIKELY (f < 1 || f > 3 || startSize > endSize)) return 3 * USHORT::get_size ();
601 return 3 * USHORT::get_size () + ((endSize - startSize + (1 << (4 - f)) - 1) >> (4 - f));
604 inline bool sanitize (SANITIZE_ARG_DEF) {
606 return SANITIZE_GET_SIZE ();
610 USHORT startSize; /* Smallest size to correct--in ppem */
611 USHORT endSize; /* Largest size to correct--in ppem */
612 USHORT deltaFormat; /* Format of DeltaValue array data: 1, 2, or 3 */
613 USHORT deltaValue[VAR]; /* Array of compressed data */
615 ASSERT_SIZE_VAR (Device, 6, USHORT);
618 #endif /* HB_OT_LAYOUT_COMMON_PRIVATE_HH */