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 bool get_tags (unsigned int *record_count /* IN/OUT */,
75 hb_tag_t *record_tags /* OUT */) const
77 const Record<Type> *a = this->const_array();
78 unsigned int count = MIN (this->len, *record_count);
79 for (unsigned int i = 0; i < count; i++)
80 record_tags[i] = a[i].tag;
82 *record_count = this->len;
85 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 bool get_indexes (unsigned int *_count /* IN/OUT */,
127 unsigned int *_indexes /* OUT */) const
129 unsigned int count = MIN (this->len, *_count);
130 const USHORT *a = this->const_array();
131 for (unsigned int i = 0; i < count; i++)
147 inline unsigned int get_feature_count (void) const
148 { return featureIndex.len; }
149 inline hb_tag_t get_feature_index (unsigned int i) const
150 { return featureIndex[i]; }
151 inline bool get_feature_indexes (unsigned int *feature_count /* IN/OUT */,
152 unsigned int *feature_indexes /* OUT */) const
153 { return featureIndex.get_indexes (feature_count, feature_indexes); }
155 inline bool has_required_feature (void) const { return reqFeatureIndex != 0xffff; }
156 inline int get_required_feature_index (void) const
158 if (reqFeatureIndex == 0xffff)
160 return reqFeatureIndex;;
163 inline bool sanitize (SANITIZE_ARG_DEF) {
165 return SANITIZE_SELF () && SANITIZE (featureIndex);
168 Offset lookupOrder; /* = Null (reserved for an offset to a
169 * reordering table) */
170 USHORT reqFeatureIndex;/* Index of a feature required for this
171 * language system--if no required features
173 IndexArray featureIndex; /* Array of indices into the FeatureList */
175 ASSERT_SIZE (LangSys, 6);
176 DEFINE_NULL_DATA (LangSys, 6, "\0\0\xFF\xFF");
181 inline unsigned int get_lang_sys_count (void) const
182 { return langSys.len; }
183 inline const Tag& get_lang_sys_tag (unsigned int i) const
184 { return langSys.get_tag (i); }
185 inline bool get_lang_sys_tags (unsigned int *lang_sys_count /* IN/OUT */,
186 hb_tag_t *lang_sys_tags /* OUT */) const
187 { return langSys.get_tags (lang_sys_count, lang_sys_tags); }
188 inline const LangSys& get_lang_sys (unsigned int i) const
190 if (i == NO_INDEX) return get_default_lang_sys ();
191 return this+langSys[i].offset;
193 inline bool find_lang_sys_index (hb_tag_t tag, unsigned int *index) const
194 { return langSys.find_index (tag, index); }
196 inline bool has_default_lang_sys (void) const { return defaultLangSys != 0; }
197 inline const LangSys& get_default_lang_sys (void) const { return this+defaultLangSys; }
199 inline bool sanitize (SANITIZE_ARG_DEF) {
201 return SANITIZE_THIS (defaultLangSys) && SANITIZE_THIS (langSys);
206 defaultLangSys; /* Offset to DefaultLangSys table--from
207 * beginning of Script table--may be Null */
208 RecordArrayOf<LangSys>
209 langSys; /* Array of LangSysRecords--listed
210 * alphabetically by LangSysTag */
212 ASSERT_SIZE (Script, 4);
214 typedef RecordListOf<Script> ScriptList;
215 ASSERT_SIZE (ScriptList, 2);
220 inline unsigned int get_lookup_count (void) const
221 { return lookupIndex.len; }
222 inline hb_tag_t get_lookup_index (unsigned int i) const
223 { return lookupIndex[i]; }
224 inline bool get_lookup_indexes (unsigned int *lookup_count /* IN/OUT */,
225 unsigned int *lookup_tags /* OUT */) const
226 { return lookupIndex.get_indexes (lookup_count, lookup_tags); }
228 inline bool sanitize (SANITIZE_ARG_DEF) {
230 return SANITIZE_SELF () && SANITIZE (lookupIndex);
233 /* TODO: implement get_feature_parameters() */
234 /* TODO: implement FeatureSize and other special features? */
235 Offset featureParams; /* Offset to Feature Parameters table (if one
236 * has been defined for the feature), relative
237 * to the beginning of the Feature Table; = Null
239 IndexArray lookupIndex; /* Array of LookupList indices */
241 ASSERT_SIZE (Feature, 4);
243 typedef RecordListOf<Feature> FeatureList;
244 ASSERT_SIZE (FeatureList, 2);
247 struct LookupFlag : USHORT
250 RightToLeft = 0x0001u,
251 IgnoreBaseGlyphs = 0x0002u,
252 IgnoreLigatures = 0x0004u,
253 IgnoreMarks = 0x0008u,
254 IgnoreFlags = 0x000Eu,
255 UseMarkFilteringSet = 0x0010u,
257 MarkAttachmentType = 0xFF00u
260 ASSERT_SIZE (LookupFlag, 2);
262 struct LookupSubTable
264 inline bool sanitize (SANITIZE_ARG_DEF) {
266 return SANITIZE_SELF ();
270 USHORT format; /* Subtable format. Different for GSUB and GPOS */
272 ASSERT_SIZE (LookupSubTable, 2);
276 inline const LookupSubTable& get_subtable (unsigned int i) const { return this+subTable[i]; }
277 inline unsigned int get_subtable_count (void) const { return subTable.len; }
279 inline unsigned int get_type (void) const { return lookupType; }
280 inline unsigned int get_flag (void) const
282 unsigned int flag = lookupFlag;
283 if (HB_UNLIKELY (flag & LookupFlag::UseMarkFilteringSet))
285 const USHORT &markFilteringSet = CONST_NEXT (USHORT, subTable);
286 flag += (markFilteringSet << 16);
291 inline bool sanitize (SANITIZE_ARG_DEF) {
293 if (!(SANITIZE (lookupType) && SANITIZE (lookupFlag) && SANITIZE_THIS (subTable))) return false;
294 if (HB_UNLIKELY (lookupFlag & LookupFlag::UseMarkFilteringSet))
296 USHORT &markFilteringSet = NEXT (USHORT, subTable);
297 if (!SANITIZE (markFilteringSet)) return false;
302 USHORT lookupType; /* Different enumerations for GSUB and GPOS */
303 USHORT lookupFlag; /* Lookup qualifiers */
304 OffsetArrayOf<LookupSubTable>
305 subTable; /* Array of SubTables */
306 USHORT markFilteringSetX[VAR]; /* Index (base 0) into GDEF mark glyph sets
307 * structure. This field is only present if bit
308 * UseMarkFilteringSet of lookup flags is set. */
310 ASSERT_SIZE_VAR (Lookup, 6, USHORT);
312 typedef OffsetListOf<Lookup> LookupList;
313 ASSERT_SIZE (LookupList, 2);
320 struct CoverageFormat1
322 friend struct Coverage;
325 inline unsigned int get_coverage (hb_codepoint_t glyph_id) const
327 if (HB_UNLIKELY (glyph_id > 0xFFFF))
332 unsigned int num_glyphs = glyphArray.len;
333 for (unsigned int i = 0; i < num_glyphs; i++)
334 if (gid == glyphArray[i])
339 inline bool sanitize (SANITIZE_ARG_DEF) {
341 return SANITIZE (glyphArray);
345 USHORT coverageFormat; /* Format identifier--format = 1 */
347 glyphArray; /* Array of GlyphIDs--in numerical order */
349 ASSERT_SIZE (CoverageFormat1, 4);
351 struct CoverageRangeRecord
353 friend struct CoverageFormat2;
355 static inline unsigned int get_size () { return sizeof (CoverageRangeRecord); }
358 inline unsigned int get_coverage (hb_codepoint_t glyph_id) const
360 if (glyph_id >= start && glyph_id <= end)
361 return (unsigned int) startCoverageIndex + (glyph_id - start);
366 inline bool sanitize (SANITIZE_ARG_DEF) {
368 return SANITIZE_SELF ();
372 GlyphID start; /* First GlyphID in the range */
373 GlyphID end; /* Last GlyphID in the range */
374 USHORT startCoverageIndex; /* Coverage Index of first GlyphID in
377 ASSERT_SIZE (CoverageRangeRecord, 6);
378 DEFINE_NULL_DATA (CoverageRangeRecord, 6, "\000\001");
380 struct CoverageFormat2
382 friend struct Coverage;
385 inline unsigned int get_coverage (hb_codepoint_t glyph_id) const
388 unsigned int count = rangeRecord.len;
389 for (unsigned int i = 0; i < count; i++)
391 unsigned int coverage = rangeRecord[i].get_coverage (glyph_id);
392 if (coverage != NOT_COVERED)
398 inline bool sanitize (SANITIZE_ARG_DEF) {
400 return SANITIZE (rangeRecord);
404 USHORT coverageFormat; /* Format identifier--format = 2 */
405 ArrayOf<CoverageRangeRecord>
406 rangeRecord; /* Array of glyph ranges--ordered by
407 * Start GlyphID. rangeCount entries
410 ASSERT_SIZE (CoverageFormat2, 4);
414 inline unsigned int operator () (hb_codepoint_t glyph_id) const { return get_coverage (glyph_id); }
416 inline unsigned int get_coverage (hb_codepoint_t glyph_id) const
419 case 1: return u.format1->get_coverage(glyph_id);
420 case 2: return u.format2->get_coverage(glyph_id);
421 default:return NOT_COVERED;
425 inline bool sanitize (SANITIZE_ARG_DEF) {
427 if (!SANITIZE (u.format)) return false;
429 case 1: return u.format1->sanitize (SANITIZE_ARG);
430 case 2: return u.format2->sanitize (SANITIZE_ARG);
437 USHORT format; /* Format identifier */
438 CoverageFormat1 format1[VAR];
439 CoverageFormat2 format2[VAR];
445 * Class Definition Table
448 struct ClassDefFormat1
450 friend struct ClassDef;
453 inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const
455 if ((unsigned int) (glyph_id - startGlyph) < classValue.len)
456 return classValue[glyph_id - startGlyph];
460 inline bool sanitize (SANITIZE_ARG_DEF) {
462 return SANITIZE_SELF () && SANITIZE (classValue);
465 USHORT classFormat; /* Format identifier--format = 1 */
466 GlyphID startGlyph; /* First GlyphID of the classValueArray */
468 classValue; /* Array of Class Values--one per GlyphID */
470 ASSERT_SIZE (ClassDefFormat1, 6);
472 struct ClassRangeRecord
474 friend struct ClassDefFormat2;
476 static inline unsigned int get_size () { return sizeof (ClassRangeRecord); }
479 inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const
481 if (glyph_id >= start && glyph_id <= end)
487 inline bool sanitize (SANITIZE_ARG_DEF) {
489 return SANITIZE_SELF ();
493 GlyphID start; /* First GlyphID in the range */
494 GlyphID end; /* Last GlyphID in the range */
495 USHORT classValue; /* Applied to all glyphs in the range */
497 ASSERT_SIZE (ClassRangeRecord, 6);
498 DEFINE_NULL_DATA (ClassRangeRecord, 6, "\000\001");
500 struct ClassDefFormat2
502 friend struct ClassDef;
505 inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const
508 unsigned int count = rangeRecord.len;
509 for (unsigned int i = 0; i < count; i++)
511 int classValue = rangeRecord[i].get_class (glyph_id);
518 inline bool sanitize (SANITIZE_ARG_DEF) {
520 return SANITIZE (rangeRecord);
523 USHORT classFormat; /* Format identifier--format = 2 */
524 ArrayOf<ClassRangeRecord>
525 rangeRecord; /* Array of glyph ranges--ordered by
528 ASSERT_SIZE (ClassDefFormat2, 4);
532 inline hb_ot_layout_class_t operator () (hb_codepoint_t glyph_id) const { return get_class (glyph_id); }
534 inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const
537 case 1: return u.format1->get_class(glyph_id);
538 case 2: return u.format2->get_class(glyph_id);
543 inline bool sanitize (SANITIZE_ARG_DEF) {
545 if (!SANITIZE (u.format)) return false;
547 case 1: return u.format1->sanitize (SANITIZE_ARG);
548 case 2: return u.format2->sanitize (SANITIZE_ARG);
555 USHORT format; /* Format identifier */
556 ClassDefFormat1 format1[VAR];
557 ClassDefFormat2 format2[VAR];
568 inline int operator () (unsigned int ppem_size) const { return get_delta (ppem_size); }
570 inline int get_delta (unsigned int ppem_size) const
572 unsigned int f = deltaFormat;
573 if (HB_UNLIKELY (f < 1 || f > 3))
576 if (ppem_size < startSize || ppem_size > endSize)
579 unsigned int s = ppem_size - startSize;
581 unsigned int byte = deltaValue[s >> (4 - f)];
582 unsigned int bits = (byte >> (16 - (((s & ((1 << (4 - f)) - 1)) + 1) << f)));
583 unsigned int mask = (0xFFFF >> (16 - (1 << f)));
585 int delta = bits & mask;
587 if ((unsigned int) delta >= ((mask + 1) >> 1))
593 inline unsigned int get_size () const
595 unsigned int f = deltaFormat;
596 if (HB_UNLIKELY (f < 1 || f > 3 || startSize > endSize)) return 3 * USHORT::get_size ();
597 return 3 * USHORT::get_size () + ((endSize - startSize + (1 << (4 - f)) - 1) >> (4 - f));
600 inline bool sanitize (SANITIZE_ARG_DEF) {
602 return SANITIZE_GET_SIZE ();
606 USHORT startSize; /* Smallest size to correct--in ppem */
607 USHORT endSize; /* Largest size to correct--in ppem */
608 USHORT deltaFormat; /* Format of DeltaValue array data: 1, 2, or 3 */
609 USHORT deltaValue[VAR]; /* Array of compressed data */
611 ASSERT_SIZE_VAR (Device, 6, USHORT);
614 #endif /* HB_OT_LAYOUT_COMMON_PRIVATE_HH */