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-types-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 char *base) {
50 /* Note: Only accept ASCII-visible tags (mind DEL)
51 * This is one of the few times (only time?) we check
52 * for data integrity, as opposed o just boundary checks
54 return (tag & 0x80808080) == 0 && offset.sanitize (SANITIZE_ARG, base);
57 Tag tag; /* 4-byte Tag identifier */
59 offset; /* Offset from beginning of object holding
63 template <typename Type>
64 struct RecordArrayOf : ArrayOf<Record<Type> >
66 inline bool sanitize (SANITIZE_ARG_DEF, const char *base) {
67 if (!(SANITIZE (this->len) && SANITIZE_GET_SIZE())) return false;
68 unsigned int count = this->len;
69 for (unsigned int i = 0; i < count; i++)
70 if (!SANITIZE_THIS (this->array[i]))
75 template <typename Type>
76 struct RecordListOf : RecordArrayOf<Type>
78 inline const Type& operator [] (unsigned int i) const
80 if (HB_UNLIKELY (i >= this->len)) return Null(Type);
81 return this+this->array[i].offset;
83 inline const Tag& get_tag (unsigned int i) const
85 if (HB_UNLIKELY (i >= this->len)) return Null(Tag);
86 return this->array[i].tag;
89 inline bool sanitize (SANITIZE_ARG_DEF) {
90 return RecordArrayOf<Type>::sanitize (SANITIZE_ARG, (const char *) this);
102 inline const unsigned int get_feature_index (unsigned int i) const { return featureIndex[i]; }
103 inline unsigned int get_feature_count (void) const { return featureIndex.len; }
105 inline bool has_required_feature (void) const { return reqFeatureIndex != 0xffff; }
106 inline int get_required_feature_index (void) const
108 if (reqFeatureIndex == 0xffff)
110 return reqFeatureIndex;;
113 inline bool sanitize (SANITIZE_ARG_DEF) {
114 return SANITIZE_SELF () && SANITIZE (featureIndex);
117 Offset lookupOrder; /* = Null (reserved for an offset to a
118 * reordering table) */
119 USHORT reqFeatureIndex;/* Index of a feature required for this
120 * language system--if no required features
123 featureIndex; /* Array of indices into the FeatureList */
125 ASSERT_SIZE_DATA (LangSys, 6, "\0\0\xFF\xFF");
130 inline const LangSys& get_lang_sys (unsigned int i) const
132 if (i == NO_INDEX) return get_default_lang_sys ();
133 return this+langSys[i].offset;
135 inline unsigned int get_lang_sys_count (void) const { return langSys.len; }
136 inline const Tag& get_lang_sys_tag (unsigned int i) const { return langSys[i].tag; }
138 // LONGTERMTODO bsearch
139 DEFINE_TAG_FIND_INTERFACE (LangSys, lang_sys); /* find_lang_sys_index (), get_lang_sys_by_tag (tag) */
141 inline bool has_default_lang_sys (void) const { return defaultLangSys != 0; }
142 inline const LangSys& get_default_lang_sys (void) const { return this+defaultLangSys; }
144 inline bool sanitize (SANITIZE_ARG_DEF) {
145 return SANITIZE_THIS (defaultLangSys) && SANITIZE_THIS (langSys);
150 defaultLangSys; /* Offset to DefaultLangSys table--from
151 * beginning of Script table--may be Null */
152 RecordArrayOf<LangSys>
153 langSys; /* Array of LangSysRecords--listed
154 * alphabetically by LangSysTag */
156 ASSERT_SIZE (Script, 4);
158 typedef RecordListOf<Script> ScriptList;
159 ASSERT_SIZE (ScriptList, 2);
164 inline const unsigned int get_lookup_index (unsigned int i) const { return lookupIndex[i]; }
165 inline unsigned int get_lookup_count (void) const { return lookupIndex.len; }
167 inline bool sanitize (SANITIZE_ARG_DEF) {
168 return SANITIZE_SELF () && SANITIZE (lookupIndex);
171 /* TODO: implement get_feature_parameters() */
172 /* TODO: implement FeatureSize and other special features? */
173 Offset featureParams; /* Offset to Feature Parameters table (if one
174 * has been defined for the feature), relative
175 * to the beginning of the Feature Table; = Null
178 lookupIndex; /* Array of LookupList indices */
180 ASSERT_SIZE (Feature, 4);
182 typedef RecordListOf<Feature> FeatureList;
183 ASSERT_SIZE (FeatureList, 2);
186 struct LookupFlag : USHORT
189 RightToLeft = 0x0001u,
190 IgnoreBaseGlyphs = 0x0002u,
191 IgnoreLigatures = 0x0004u,
192 IgnoreMarks = 0x0008u,
193 UseMarkFilteringSet = 0x0010u,
195 MarkAttachmentType = 0xFF00u,
198 ASSERT_SIZE (LookupFlag, 2);
200 struct LookupSubTable
202 inline bool sanitize (SANITIZE_ARG_DEF) {
203 return SANITIZE_SELF ();
207 USHORT format; /* Subtable format. Different for GSUB and GPOS */
209 ASSERT_SIZE (LookupSubTable, 2);
213 inline const LookupSubTable& get_subtable (unsigned int i) const { return this+subTable[i]; }
214 inline unsigned int get_subtable_count (void) const { return subTable.len; }
216 inline unsigned int get_type (void) const { return lookupType; }
217 inline unsigned int get_flag (void) const
219 unsigned int flag = lookupFlag;
220 if (HB_UNLIKELY (flag & LookupFlag::UseMarkFilteringSet))
222 const USHORT &markFilteringSet = *(const USHORT*)
223 ((const char *) &subTable + subTable.get_size ());
224 flag += (markFilteringSet << 16);
229 inline bool sanitize (SANITIZE_ARG_DEF) {
230 if (!(SANITIZE_SELF () && SANITIZE_THIS (subTable))) return false;
231 if (HB_UNLIKELY (lookupFlag & LookupFlag::UseMarkFilteringSet))
233 USHORT &markFilteringSet = *(USHORT*) ((char *) &subTable + subTable.get_size ());
234 if (!SANITIZE (markFilteringSet)) return false;
239 USHORT lookupType; /* Different enumerations for GSUB and GPOS */
240 USHORT lookupFlag; /* Lookup qualifiers */
241 OffsetArrayOf<LookupSubTable>
242 subTable; /* Array of SubTables */
243 USHORT markFilteringSetX[0]; /* Index (base 0) into GDEF mark glyph sets
244 * structure. This field is only present if bit
245 * UseMarkFilteringSet of lookup flags is set. */
247 ASSERT_SIZE (Lookup, 6);
249 template <typename Type>
250 struct OffsetListOf : OffsetArrayOf<Type>
252 inline const Type& operator [] (unsigned int i) const
254 if (HB_UNLIKELY (i >= this->len)) return Null(Type);
255 return this+this->array[i];
258 inline bool sanitize (SANITIZE_ARG_DEF) {
259 return OffsetArrayOf<Type>::sanitize (SANITIZE_ARG, (const char *) this);
263 typedef OffsetListOf<Lookup> LookupList;
264 ASSERT_SIZE (LookupList, 2);
271 struct CoverageFormat1
273 friend struct Coverage;
276 inline unsigned int get_coverage (hb_codepoint_t glyph_id) const
278 if (HB_UNLIKELY (glyph_id > 0xFFFF))
283 unsigned int num_glyphs = glyphArray.len;
284 for (unsigned int i = 0; i < num_glyphs; i++)
285 if (gid == glyphArray[i])
290 inline bool sanitize (SANITIZE_ARG_DEF) {
291 return SANITIZE (glyphArray);
295 USHORT coverageFormat; /* Format identifier--format = 1 */
297 glyphArray; /* Array of GlyphIDs--in numerical order */
299 ASSERT_SIZE (CoverageFormat1, 4);
301 struct CoverageRangeRecord
303 friend struct CoverageFormat2;
306 inline unsigned int get_coverage (hb_codepoint_t glyph_id) const
308 if (glyph_id >= start && glyph_id <= end)
309 return (unsigned int) startCoverageIndex + (glyph_id - start);
314 inline bool sanitize (SANITIZE_ARG_DEF) {
315 return SANITIZE_SELF ();
319 GlyphID start; /* First GlyphID in the range */
320 GlyphID end; /* Last GlyphID in the range */
321 USHORT startCoverageIndex; /* Coverage Index of first GlyphID in
324 ASSERT_SIZE_DATA (CoverageRangeRecord, 6, "\000\001");
326 struct CoverageFormat2
328 friend struct Coverage;
331 inline unsigned int get_coverage (hb_codepoint_t glyph_id) const
334 unsigned int count = rangeRecord.len;
335 for (unsigned int i = 0; i < count; i++)
337 unsigned int coverage = rangeRecord[i].get_coverage (glyph_id);
338 if (coverage != NOT_COVERED)
344 inline bool sanitize (SANITIZE_ARG_DEF) {
345 return SANITIZE (rangeRecord);
349 USHORT coverageFormat; /* Format identifier--format = 2 */
350 ArrayOf<CoverageRangeRecord>
351 rangeRecord; /* Array of glyph ranges--ordered by
352 * Start GlyphID. rangeCount entries
355 ASSERT_SIZE (CoverageFormat2, 4);
359 inline unsigned int operator() (hb_codepoint_t glyph_id) const { return get_coverage (glyph_id); }
361 unsigned int get_coverage (hb_codepoint_t glyph_id) const
364 case 1: return u.format1->get_coverage(glyph_id);
365 case 2: return u.format2->get_coverage(glyph_id);
366 default:return NOT_COVERED;
370 inline bool sanitize (SANITIZE_ARG_DEF) {
371 if (!SANITIZE (u.format)) return false;
373 case 1: return u.format1->sanitize (SANITIZE_ARG);
374 case 2: return u.format2->sanitize (SANITIZE_ARG);
381 USHORT format; /* Format identifier */
382 CoverageFormat1 format1[];
383 CoverageFormat2 format2[];
386 ASSERT_SIZE (Coverage, 2);
390 * Class Definition Table
393 struct ClassDefFormat1
395 friend struct ClassDef;
398 inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const
400 if ((unsigned int) (glyph_id - startGlyph) < classValue.len)
401 return classValue[glyph_id - startGlyph];
405 inline bool sanitize (SANITIZE_ARG_DEF) {
406 return SANITIZE_SELF () && SANITIZE (classValue);
409 USHORT classFormat; /* Format identifier--format = 1 */
410 GlyphID startGlyph; /* First GlyphID of the classValueArray */
412 classValue; /* Array of Class Values--one per GlyphID */
414 ASSERT_SIZE (ClassDefFormat1, 6);
416 struct ClassRangeRecord
418 friend struct ClassDefFormat2;
421 inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const
423 if (glyph_id >= start && glyph_id <= end)
429 inline bool sanitize (SANITIZE_ARG_DEF) {
430 return SANITIZE_SELF ();
434 GlyphID start; /* First GlyphID in the range */
435 GlyphID end; /* Last GlyphID in the range */
436 USHORT classValue; /* Applied to all glyphs in the range */
438 ASSERT_SIZE_DATA (ClassRangeRecord, 6, "\000\001");
440 struct ClassDefFormat2
442 friend struct ClassDef;
445 inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const
448 unsigned int count = rangeRecord.len;
449 for (unsigned int i = 0; i < count; i++)
451 int classValue = rangeRecord[i].get_class (glyph_id);
458 inline bool sanitize (SANITIZE_ARG_DEF) {
459 return SANITIZE (rangeRecord);
462 USHORT classFormat; /* Format identifier--format = 2 */
463 ArrayOf<ClassRangeRecord>
464 rangeRecord; /* Array of glyph ranges--ordered by
467 ASSERT_SIZE (ClassDefFormat2, 4);
471 inline unsigned int operator() (hb_codepoint_t glyph_id) const { return get_class (glyph_id); }
473 hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const
476 case 1: return u.format1->get_class(glyph_id);
477 case 2: return u.format2->get_class(glyph_id);
482 inline bool sanitize (SANITIZE_ARG_DEF) {
483 if (!SANITIZE (u.format)) return false;
485 case 1: return u.format1->sanitize (SANITIZE_ARG);
486 case 2: return u.format2->sanitize (SANITIZE_ARG);
493 USHORT format; /* Format identifier */
494 ClassDefFormat1 format1[];
495 ClassDefFormat2 format2[];
498 ASSERT_SIZE (ClassDef, 2);
507 int get_delta (unsigned int ppem_size) const
509 unsigned int f = deltaFormat;
510 if (HB_UNLIKELY (f < 1 || f > 3))
513 if (ppem_size < startSize || ppem_size > endSize)
516 unsigned int s = ppem_size - startSize;
518 unsigned int byte = deltaValue[s >> (4 - f)];
519 unsigned int bits = (byte >> (16 - (((s & ((1 << (4 - f)) - 1)) + 1) << f)));
520 unsigned int mask = (0xFFFF >> (16 - (1 << f)));
522 int delta = bits & mask;
524 if (delta >= ((mask + 1) >> 1))
530 inline int operator() (unsigned int ppem_size) const { return get_delta (ppem_size); }
533 USHORT startSize; /* Smallest size to correct--in ppem */
534 USHORT endSize; /* Largest size to correct--in ppem */
535 USHORT deltaFormat; /* Format of DeltaValue array data: 1, 2, or 3 */
536 USHORT deltaValue[]; /* Array of compressed data */
538 ASSERT_SIZE (Device, 6);
541 #endif /* HB_OT_LAYOUT_COMMON_PRIVATE_HH */