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"
37 * OpenType Layout Common Table Formats
43 * Script, ScriptList, LangSys, Feature, FeatureList, Lookup, LookupList
46 template <typename Type>
49 inline bool sanitize (SANITIZE_ARG_DEF, const void *base) {
50 return SANITIZE (tag) == 0 && SANITIZE_BASE (offset, base);
53 Tag tag; /* 4-byte Tag identifier */
55 offset; /* Offset from beginning of object holding
59 template <typename Type>
60 struct RecordArrayOf : ArrayOf<Record<Type> > {};
62 template <typename Type>
63 struct RecordListOf : RecordArrayOf<Type>
65 inline const Type& operator [] (unsigned int i) const
67 if (HB_UNLIKELY (i >= this->len)) return Null(Type);
68 return this+this->array[i].offset;
70 inline const Tag& get_tag (unsigned int i) const
72 if (HB_UNLIKELY (i >= this->len)) return Null(Tag);
73 return this->array[i].tag;
76 inline bool sanitize (SANITIZE_ARG_DEF) {
77 return RecordArrayOf<Type>::sanitize (SANITIZE_ARG, CONST_CHARP(this));
89 inline unsigned int get_feature_index (unsigned int i) const { return featureIndex[i]; }
90 inline unsigned int get_feature_count (void) const { return featureIndex.len; }
92 inline bool has_required_feature (void) const { return reqFeatureIndex != 0xffff; }
93 inline int get_required_feature_index (void) const
95 if (reqFeatureIndex == 0xffff)
97 return reqFeatureIndex;;
100 inline bool sanitize (SANITIZE_ARG_DEF) {
101 return SANITIZE_SELF () && SANITIZE (featureIndex);
104 Offset lookupOrder; /* = Null (reserved for an offset to a
105 * reordering table) */
106 USHORT reqFeatureIndex;/* Index of a feature required for this
107 * language system--if no required features
110 featureIndex; /* Array of indices into the FeatureList */
112 ASSERT_SIZE_DATA (LangSys, 6, "\0\0\xFF\xFF");
117 inline const LangSys& get_lang_sys (unsigned int i) const
119 if (i == NO_INDEX) return get_default_lang_sys ();
120 return this+langSys[i].offset;
122 inline unsigned int get_lang_sys_count (void) const { return langSys.len; }
123 inline const Tag& get_lang_sys_tag (unsigned int i) const { return langSys[i].tag; }
125 // LONGTERMTODO bsearch
126 DEFINE_TAG_FIND_INTERFACE (LangSys, lang_sys); /* find_lang_sys_index (), get_lang_sys_by_tag (tag) */
128 inline bool has_default_lang_sys (void) const { return defaultLangSys != 0; }
129 inline const LangSys& get_default_lang_sys (void) const { return this+defaultLangSys; }
131 inline bool sanitize (SANITIZE_ARG_DEF) {
132 return SANITIZE_THIS (defaultLangSys) && SANITIZE_THIS (langSys);
137 defaultLangSys; /* Offset to DefaultLangSys table--from
138 * beginning of Script table--may be Null */
139 RecordArrayOf<LangSys>
140 langSys; /* Array of LangSysRecords--listed
141 * alphabetically by LangSysTag */
143 ASSERT_SIZE (Script, 4);
145 typedef RecordListOf<Script> ScriptList;
146 ASSERT_SIZE (ScriptList, 2);
151 inline unsigned int get_lookup_index (unsigned int i) const { return lookupIndex[i]; }
152 inline unsigned int get_lookup_count (void) const { return lookupIndex.len; }
154 inline bool sanitize (SANITIZE_ARG_DEF) {
155 return SANITIZE_SELF () && SANITIZE (lookupIndex);
158 /* TODO: implement get_feature_parameters() */
159 /* TODO: implement FeatureSize and other special features? */
160 Offset featureParams; /* Offset to Feature Parameters table (if one
161 * has been defined for the feature), relative
162 * to the beginning of the Feature Table; = Null
165 lookupIndex; /* Array of LookupList indices */
167 ASSERT_SIZE (Feature, 4);
169 typedef RecordListOf<Feature> FeatureList;
170 ASSERT_SIZE (FeatureList, 2);
173 struct LookupFlag : USHORT
176 RightToLeft = 0x0001u,
177 IgnoreBaseGlyphs = 0x0002u,
178 IgnoreLigatures = 0x0004u,
179 IgnoreMarks = 0x0008u,
180 UseMarkFilteringSet = 0x0010u,
182 MarkAttachmentType = 0xFF00u,
185 ASSERT_SIZE (LookupFlag, 2);
187 struct LookupSubTable
189 inline bool sanitize (SANITIZE_ARG_DEF) {
190 return SANITIZE_SELF ();
194 USHORT format; /* Subtable format. Different for GSUB and GPOS */
196 ASSERT_SIZE (LookupSubTable, 2);
200 inline const LookupSubTable& get_subtable (unsigned int i) const { return this+subTable[i]; }
201 inline unsigned int get_subtable_count (void) const { return subTable.len; }
203 inline unsigned int get_type (void) const { return lookupType; }
204 inline unsigned int get_flag (void) const
206 unsigned int flag = lookupFlag;
207 if (HB_UNLIKELY (flag & LookupFlag::UseMarkFilteringSet))
209 const USHORT &markFilteringSet = CONST_CAST (USHORT, subTable, subTable.get_size ());
210 flag += (markFilteringSet << 16);
215 inline bool sanitize (SANITIZE_ARG_DEF) {
216 if (!(SANITIZE_SELF () && SANITIZE_THIS (subTable))) return false;
217 if (HB_UNLIKELY (lookupFlag & LookupFlag::UseMarkFilteringSet))
219 USHORT &markFilteringSet = CAST (USHORT, subTable, subTable.get_size ());
220 if (!SANITIZE (markFilteringSet)) return false;
225 USHORT lookupType; /* Different enumerations for GSUB and GPOS */
226 USHORT lookupFlag; /* Lookup qualifiers */
227 OffsetArrayOf<LookupSubTable>
228 subTable; /* Array of SubTables */
229 USHORT markFilteringSetX[0]; /* Index (base 0) into GDEF mark glyph sets
230 * structure. This field is only present if bit
231 * UseMarkFilteringSet of lookup flags is set. */
233 ASSERT_SIZE (Lookup, 6);
235 template <typename Type>
236 struct OffsetListOf : OffsetArrayOf<Type>
238 inline const Type& operator [] (unsigned int i) const
240 if (HB_UNLIKELY (i >= this->len)) return Null(Type);
241 return this+this->array[i];
244 inline bool sanitize (SANITIZE_ARG_DEF) {
245 return OffsetArrayOf<Type>::sanitize (SANITIZE_ARG, CONST_CHARP(this));
249 typedef OffsetListOf<Lookup> LookupList;
250 ASSERT_SIZE (LookupList, 2);
257 struct CoverageFormat1
259 friend struct Coverage;
262 inline unsigned int get_coverage (hb_codepoint_t glyph_id) const
264 if (HB_UNLIKELY (glyph_id > 0xFFFF))
269 unsigned int num_glyphs = glyphArray.len;
270 for (unsigned int i = 0; i < num_glyphs; i++)
271 if (gid == glyphArray[i])
276 inline bool sanitize (SANITIZE_ARG_DEF) {
277 return SANITIZE (glyphArray);
281 USHORT coverageFormat; /* Format identifier--format = 1 */
283 glyphArray; /* Array of GlyphIDs--in numerical order */
285 ASSERT_SIZE (CoverageFormat1, 4);
287 struct CoverageRangeRecord
289 friend struct CoverageFormat2;
292 inline unsigned int get_coverage (hb_codepoint_t glyph_id) const
294 if (glyph_id >= start && glyph_id <= end)
295 return (unsigned int) startCoverageIndex + (glyph_id - start);
300 inline bool sanitize (SANITIZE_ARG_DEF) {
301 return SANITIZE_SELF ();
305 GlyphID start; /* First GlyphID in the range */
306 GlyphID end; /* Last GlyphID in the range */
307 USHORT startCoverageIndex; /* Coverage Index of first GlyphID in
310 ASSERT_SIZE_DATA (CoverageRangeRecord, 6, "\000\001");
312 struct CoverageFormat2
314 friend struct Coverage;
317 inline unsigned int get_coverage (hb_codepoint_t glyph_id) const
320 unsigned int count = rangeRecord.len;
321 for (unsigned int i = 0; i < count; i++)
323 unsigned int coverage = rangeRecord[i].get_coverage (glyph_id);
324 if (coverage != NOT_COVERED)
330 inline bool sanitize (SANITIZE_ARG_DEF) {
331 return SANITIZE (rangeRecord);
335 USHORT coverageFormat; /* Format identifier--format = 2 */
336 ArrayOf<CoverageRangeRecord>
337 rangeRecord; /* Array of glyph ranges--ordered by
338 * Start GlyphID. rangeCount entries
341 ASSERT_SIZE (CoverageFormat2, 4);
345 inline unsigned int operator() (hb_codepoint_t glyph_id) const { return get_coverage (glyph_id); }
347 unsigned int get_coverage (hb_codepoint_t glyph_id) const
350 case 1: return u.format1->get_coverage(glyph_id);
351 case 2: return u.format2->get_coverage(glyph_id);
352 default:return NOT_COVERED;
356 bool sanitize (SANITIZE_ARG_DEF) {
357 if (!SANITIZE (u.format)) return false;
359 case 1: return u.format1->sanitize (SANITIZE_ARG);
360 case 2: return u.format2->sanitize (SANITIZE_ARG);
367 USHORT format; /* Format identifier */
368 CoverageFormat1 format1[];
369 CoverageFormat2 format2[];
372 ASSERT_SIZE (Coverage, 2);
376 * Class Definition Table
379 struct ClassDefFormat1
381 friend struct ClassDef;
384 inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const
386 if ((unsigned int) (glyph_id - startGlyph) < classValue.len)
387 return classValue[glyph_id - startGlyph];
391 inline bool sanitize (SANITIZE_ARG_DEF) {
392 return SANITIZE_SELF () && SANITIZE (classValue);
395 USHORT classFormat; /* Format identifier--format = 1 */
396 GlyphID startGlyph; /* First GlyphID of the classValueArray */
398 classValue; /* Array of Class Values--one per GlyphID */
400 ASSERT_SIZE (ClassDefFormat1, 6);
402 struct ClassRangeRecord
404 friend struct ClassDefFormat2;
407 inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const
409 if (glyph_id >= start && glyph_id <= end)
415 inline bool sanitize (SANITIZE_ARG_DEF) {
416 return SANITIZE_SELF ();
420 GlyphID start; /* First GlyphID in the range */
421 GlyphID end; /* Last GlyphID in the range */
422 USHORT classValue; /* Applied to all glyphs in the range */
424 ASSERT_SIZE_DATA (ClassRangeRecord, 6, "\000\001");
426 struct ClassDefFormat2
428 friend struct ClassDef;
431 inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const
434 unsigned int count = rangeRecord.len;
435 for (unsigned int i = 0; i < count; i++)
437 int classValue = rangeRecord[i].get_class (glyph_id);
444 inline bool sanitize (SANITIZE_ARG_DEF) {
445 return SANITIZE (rangeRecord);
448 USHORT classFormat; /* Format identifier--format = 2 */
449 ArrayOf<ClassRangeRecord>
450 rangeRecord; /* Array of glyph ranges--ordered by
453 ASSERT_SIZE (ClassDefFormat2, 4);
457 inline unsigned int operator() (hb_codepoint_t glyph_id) const { return get_class (glyph_id); }
459 hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const
462 case 1: return u.format1->get_class(glyph_id);
463 case 2: return u.format2->get_class(glyph_id);
468 bool sanitize (SANITIZE_ARG_DEF) {
469 if (!SANITIZE (u.format)) return false;
471 case 1: return u.format1->sanitize (SANITIZE_ARG);
472 case 2: return u.format2->sanitize (SANITIZE_ARG);
479 USHORT format; /* Format identifier */
480 ClassDefFormat1 format1[];
481 ClassDefFormat2 format2[];
484 ASSERT_SIZE (ClassDef, 2);
493 inline int operator() (unsigned int ppem_size) const { return get_delta (ppem_size); }
495 int get_delta (unsigned int ppem_size) const
497 unsigned int f = deltaFormat;
498 if (HB_UNLIKELY (f < 1 || f > 3))
501 if (ppem_size < startSize || ppem_size > endSize)
504 unsigned int s = ppem_size - startSize;
506 unsigned int byte = deltaValue[s >> (4 - f)];
507 unsigned int bits = (byte >> (16 - (((s & ((1 << (4 - f)) - 1)) + 1) << f)));
508 unsigned int mask = (0xFFFF >> (16 - (1 << f)));
510 int delta = bits & mask;
512 if ((unsigned int) delta >= ((mask + 1) >> 1))
518 inline unsigned int get_size () const
520 unsigned int f = deltaFormat;
521 if (HB_UNLIKELY (f < 1 || f > 3 || startSize > endSize)) return sizeof (*this);
522 return sizeof (*this) + ((endSize - startSize + (1 << (4 - f)) - 1) >> (4 - f));
525 bool sanitize (SANITIZE_ARG_DEF) {
526 return SANITIZE_GET_SIZE ();
530 USHORT startSize; /* Smallest size to correct--in ppem */
531 USHORT endSize; /* Largest size to correct--in ppem */
532 USHORT deltaFormat; /* Format of DeltaValue array data: 1, 2, or 3 */
533 USHORT deltaValue[]; /* Array of compressed data */
535 ASSERT_SIZE (Device, 6);
538 #endif /* HB_OT_LAYOUT_COMMON_PRIVATE_HH */