[HB] Split Layout-common tables into new files

This commit is contained in:
Behdad Esfahbod 2009-05-17 20:28:01 -04:00
parent f45107fe09
commit 6f20f72e9c
5 changed files with 434 additions and 409 deletions

View File

@ -0,0 +1,429 @@
/*
* Copyright (C) 2007,2008,2009 Red Hat, Inc.
*
* This is part of HarfBuzz, an OpenType Layout engine library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Red Hat Author(s): Behdad Esfahbod
*/
#ifndef HB_OT_LAYOUT_COMMON_PRIVATE_H
#define HB_OT_LAYOUT_COMMON_PRIVATE_H
#include "hb-ot-layout-open-private.h"
/*
*
* OpenType Layout Common Table Formats
*
*/
/*
* Script, ScriptList, LangSys, Feature, FeatureList, Lookup, LookupList
*/
template <typename Type>
struct Record {
Tag tag; /* 4-byte Tag identifier */
OffsetTo<Type>
offset; /* Offset from beginning of object holding
* the Record */
};
template <typename Type>
struct RecordListOf : ArrayOf<Record<Type> > {
inline const Type& operator [] (unsigned int i) const {
if (HB_UNLIKELY (i >= this->len)) return Null(Type);
return this+this->array[i].offset;
}
inline const Tag& get_tag (unsigned int i) const {
if (HB_UNLIKELY (i >= this->len)) return Null(Tag);
return this->array[i].tag;
}
};
struct Script;
typedef Record<Script> ScriptRecord;
ASSERT_SIZE (ScriptRecord, 6);
struct LangSys;
typedef Record<LangSys> LangSysRecord;
ASSERT_SIZE (LangSysRecord, 6);
struct Feature;
typedef Record<Feature> FeatureRecord;
ASSERT_SIZE (FeatureRecord, 6);
struct LangSys {
inline const unsigned int get_feature_index (unsigned int i) const {
return featureIndex[i];
}
inline unsigned int get_feature_count (void) const {
return featureIndex.len;
}
inline const bool has_required_feature (void) const {
return reqFeatureIndex != 0xffff;
}
/* Returns NO_INDEX if none */
inline int get_required_feature_index (void) const {
if (reqFeatureIndex == 0xffff)
return NO_INDEX;
return reqFeatureIndex;;
}
Offset lookupOrder; /* = Null (reserved for an offset to a
* reordering table) */
USHORT reqFeatureIndex;/* Index of a feature required for this
* language system--if no required features
* = 0xFFFF */
ArrayOf<USHORT>
featureIndex; /* Array of indices into the FeatureList */
};
ASSERT_SIZE_DATA (LangSys, 6, "\0\0\xFF\xFF");
struct Script {
inline const LangSys& get_lang_sys (unsigned int i) const {
if (i == NO_INDEX) return get_default_lang_sys ();
return this+langSys[i].offset;
}
inline unsigned int get_lang_sys_count (void) const {
return langSys.len;
}
inline const Tag& get_lang_sys_tag (unsigned int i) const {
return langSys[i].tag;
}
// LONGTERMTODO bsearch
DEFINE_TAG_FIND_INTERFACE (LangSys, lang_sys); /* find_lang_sys_index (), get_lang_sys_by_tag (tag) */
inline const bool has_default_lang_sys (void) const {
return defaultLangSys != 0;
}
inline const LangSys& get_default_lang_sys (void) const {
return this+defaultLangSys;
}
private:
OffsetTo<LangSys>
defaultLangSys; /* Offset to DefaultLangSys table--from
* beginning of Script table--may be Null */
ArrayOf<LangSysRecord>
langSys; /* Array of LangSysRecords--listed
* alphabetically by LangSysTag */
};
ASSERT_SIZE (Script, 4);
typedef RecordListOf<Script> ScriptList;
ASSERT_SIZE (ScriptList, 2);
struct Feature {
inline const unsigned int get_lookup_index (unsigned int i) const {
return lookupIndex[i];
}
inline unsigned int get_lookup_count (void) const {
return lookupIndex.len;
}
/* TODO: implement get_feature_parameters() */
/* TODO: implement FeatureSize and other special features? */
Offset featureParams; /* Offset to Feature Parameters table (if one
* has been defined for the feature), relative
* to the beginning of the Feature Table; = Null
* if not required */
ArrayOf<USHORT>
lookupIndex; /* Array of LookupList indices */
};
ASSERT_SIZE (Feature, 4);
typedef RecordListOf<Feature> FeatureList;
ASSERT_SIZE (FeatureList, 2);
struct LookupFlag : USHORT {
static const unsigned int RightToLeft = 0x0001u;
static const unsigned int IgnoreBaseGlyphs = 0x0002u;
static const unsigned int IgnoreLigatures = 0x0004u;
static const unsigned int IgnoreMarks = 0x0008u;
static const unsigned int Reserved = 0x00F0u;
static const unsigned int MarkAttachmentType = 0xFF00u;
};
ASSERT_SIZE (LookupFlag, 2);
struct LookupSubTable {
private:
USHORT format; /* Subtable format. Different for GSUB and GPOS */
};
ASSERT_SIZE (LookupSubTable, 2);
struct Lookup {
inline const LookupSubTable& get_subtable (unsigned int i) const {
return this+subTable[i];
}
inline unsigned int get_subtable_count (void) const {
return subTable.len;
}
inline bool is_right_to_left (void) const { return lookupFlag & LookupFlag::RightToLeft; }
inline bool ignore_base_glyphs(void) const { return lookupFlag & LookupFlag::IgnoreBaseGlyphs; }
inline bool ignore_ligatures (void) const { return lookupFlag & LookupFlag::IgnoreLigatures; }
inline bool ignore_marks (void) const { return lookupFlag & LookupFlag::IgnoreMarks; }
inline unsigned int get_mark_attachment_type (void) const { return lookupFlag & LookupFlag::MarkAttachmentType; }
inline unsigned int get_type (void) const { return lookupType; }
inline unsigned int get_flag (void) const { return lookupFlag; }
USHORT lookupType; /* Different enumerations for GSUB and GPOS */
USHORT lookupFlag; /* Lookup qualifiers */
OffsetArrayOf<LookupSubTable>
subTable; /* Array of SubTables */
};
ASSERT_SIZE (Lookup, 6);
template <typename Type>
struct OffsetListOf : OffsetArrayOf<Type> {
inline const Type& operator [] (unsigned int i) const {
if (HB_UNLIKELY (i >= this->len)) return Null(Type);
return this+this->array[i];
}
};
typedef OffsetListOf<Lookup> LookupList;
ASSERT_SIZE (LookupList, 2);
/*
* Coverage Table
*/
struct CoverageFormat1 {
friend struct Coverage;
private:
inline unsigned int get_coverage (hb_codepoint_t glyph_id) const {
GlyphID gid;
if (HB_UNLIKELY (glyph_id > 65535))
return NOT_COVERED;
gid = glyph_id;
// TODO: bsearch
unsigned int num_glyphs = glyphArray.len;
for (unsigned int i = 0; i < num_glyphs; i++)
if (gid == glyphArray[i])
return i;
return NOT_COVERED;
}
USHORT coverageFormat; /* Format identifier--format = 1 */
ArrayOf<GlyphID>
glyphArray; /* Array of GlyphIDs--in numerical order */
};
ASSERT_SIZE (CoverageFormat1, 4);
struct CoverageRangeRecord {
friend struct CoverageFormat2;
private:
inline unsigned int get_coverage (hb_codepoint_t glyph_id) const {
if (glyph_id >= start && glyph_id <= end)
return startCoverageIndex + (glyph_id - start);
return NOT_COVERED;
}
private:
GlyphID start; /* First GlyphID in the range */
GlyphID end; /* Last GlyphID in the range */
USHORT startCoverageIndex; /* Coverage Index of first GlyphID in
* range */
};
ASSERT_SIZE_DATA (CoverageRangeRecord, 6, "\000\001");
struct CoverageFormat2 {
friend struct Coverage;
private:
inline unsigned int get_coverage (hb_codepoint_t glyph_id) const {
// TODO: bsearch
unsigned int count = rangeRecord.len;
for (unsigned int i = 0; i < count; i++) {
int coverage = rangeRecord[i].get_coverage (glyph_id);
if (coverage >= 0)
return coverage;
}
return NOT_COVERED;
}
USHORT coverageFormat; /* Format identifier--format = 2 */
ArrayOf<CoverageRangeRecord>
rangeRecord; /* Array of glyph ranges--ordered by
* Start GlyphID. rangeCount entries
* long */
};
ASSERT_SIZE (CoverageFormat2, 4);
struct Coverage {
unsigned int get_coverage (hb_codepoint_t glyph_id) const {
switch (u.format) {
case 1: return u.format1->get_coverage(glyph_id);
case 2: return u.format2->get_coverage(glyph_id);
default:return NOT_COVERED;
}
}
unsigned int operator() (hb_codepoint_t glyph_id) const {
return get_coverage (glyph_id);
}
private:
union {
USHORT format; /* Format identifier */
CoverageFormat1 format1[];
CoverageFormat2 format2[];
} u;
};
ASSERT_SIZE (Coverage, 2);
/*
* Class Definition Table
*/
struct ClassDefFormat1 {
friend struct ClassDef;
private:
inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const {
if ((unsigned int) (glyph_id - startGlyph) < classValue.len)
return classValue[glyph_id - startGlyph];
return 0;
}
USHORT classFormat; /* Format identifier--format = 1 */
GlyphID startGlyph; /* First GlyphID of the classValueArray */
ArrayOf<USHORT>
classValue; /* Array of Class Values--one per GlyphID */
};
ASSERT_SIZE (ClassDefFormat1, 6);
struct ClassRangeRecord {
friend struct ClassDefFormat2;
private:
inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const {
if (glyph_id >= start && glyph_id <= end)
return classValue;
return 0;
}
private:
GlyphID start; /* First GlyphID in the range */
GlyphID end; /* Last GlyphID in the range */
USHORT classValue; /* Applied to all glyphs in the range */
};
ASSERT_SIZE_DATA (ClassRangeRecord, 6, "\000\001");
struct ClassDefFormat2 {
friend struct ClassDef;
private:
inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const {
// TODO: bsearch
unsigned int count = rangeRecord.len;
for (unsigned int i = 0; i < count; i++) {
int classValue = rangeRecord[i].get_class (glyph_id);
if (classValue > 0)
return classValue;
}
return 0;
}
USHORT classFormat; /* Format identifier--format = 2 */
ArrayOf<ClassRangeRecord>
rangeRecord; /* Array of glyph ranges--ordered by
* Start GlyphID */
};
ASSERT_SIZE (ClassDefFormat2, 4);
struct ClassDef {
hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const {
switch (u.format) {
case 1: return u.format1->get_class(glyph_id);
case 2: return u.format2->get_class(glyph_id);
default:return 0;
}
}
private:
union {
USHORT format; /* Format identifier */
ClassDefFormat1 format1[];
ClassDefFormat2 format2[];
} u;
};
ASSERT_SIZE (ClassDef, 2);
/*
* Device Tables
*/
struct Device {
int get_delta (int ppem_size) const {
if (ppem_size >= startSize && ppem_size <= endSize &&
deltaFormat >= 1 && deltaFormat <= 3) {
int s = ppem_size - startSize;
int f = deltaFormat;
uint16_t byte = deltaValue[s >> (4 - f)];
uint16_t bits = byte >> (16 - (((s & ((1 << (4 - f)) - 1)) + 1) << f));
uint16_t mask = 0xFFFF >> (16 - (1 << f));
int delta = bits & mask;
if (delta >= ((mask + 1) >> 1))
delta -= mask + 1;
return delta;
}
return 0;
}
private:
USHORT startSize; /* Smallest size to correct--in ppem */
USHORT endSize; /* Largest size to correct--in ppem */
USHORT deltaFormat; /* Format of DeltaValue array data: 1, 2, or 3 */
USHORT deltaValue[]; /* Array of compressed data */
};
ASSERT_SIZE (Device, 6);
#endif /* HB_OT_LAYOUT_COMMON_PRIVATE_H */

View File

@ -27,7 +27,7 @@
#ifndef HB_OT_LAYOUT_GDEF_PRIVATE_H #ifndef HB_OT_LAYOUT_GDEF_PRIVATE_H
#define HB_OT_LAYOUT_GDEF_PRIVATE_H #define HB_OT_LAYOUT_GDEF_PRIVATE_H
#include "hb-ot-layout-open-private.h" #include "hb-ot-layout-common-private.h"
#define DEFINE_INDIRECT_GLYPH_ARRAY_LOOKUP(Type, array, name) \ #define DEFINE_INDIRECT_GLYPH_ARRAY_LOOKUP(Type, array, name) \
@ -227,4 +227,5 @@ struct GDEF {
}; };
ASSERT_SIZE (GDEF, 12); ASSERT_SIZE (GDEF, 12);
#endif /* HB_OT_LAYOUT_GDEF_PRIVATE_H */ #endif /* HB_OT_LAYOUT_GDEF_PRIVATE_H */

View File

@ -39,6 +39,7 @@ _hb_buffer_add_output_glyph_ids( HB_Buffer buffer,
HB_UShort component, HB_UShort component,
HB_UShort ligID ); HB_UShort ligID );
struct SingleSubstFormat1 { struct SingleSubstFormat1 {
friend struct SingleSubst; friend struct SingleSubst;

View File

@ -30,6 +30,7 @@
#include "hb-ot-layout-gdef-private.h" #include "hb-ot-layout-gdef-private.h"
#include "harfbuzz-buffer-private.h" /* XXX */ #include "harfbuzz-buffer-private.h" /* XXX */
#define LOOKUP_ARGS_DEF \ #define LOOKUP_ARGS_DEF \
hb_ot_layout_t *layout, \ hb_ot_layout_t *layout, \
hb_buffer_t *buffer, \ hb_buffer_t *buffer, \
@ -363,4 +364,5 @@ struct GSUBGPOS {
}; };
ASSERT_SIZE (GSUBGPOS, 10); ASSERT_SIZE (GSUBGPOS, 10);
#endif /* HB_OT_LAYOUT_GSUBGPOS_PRIVATE_H */ #endif /* HB_OT_LAYOUT_GSUBGPOS_PRIVATE_H */

View File

@ -73,23 +73,6 @@
return *(const Type *)((const char*)this + array[i]); \ return *(const Type *)((const char*)this + array[i]); \
} }
/* A record array type is like an array type, but it contains a table
* of records to the objects. Each record has a tag, and an offset
* relative to the beginning of the current object. */
#define DEFINE_RECORD_ARRAY_TYPE(Type, array, num) \
DEFINE_RECORD_ACCESSOR(Type, array, num) \
DEFINE_LEN(Record, array, num)
#define DEFINE_RECORD_ACCESSOR(Type, array, num) \
inline const Type& operator[] (unsigned int i) const { \
if (HB_UNLIKELY (i >= num)) return Null(Type); \
if (HB_UNLIKELY (!array[i].offset)) return Null(Type); \
return *(const Type *)((const char*)this + array[i].offset); \
} \
inline const Tag& get_tag (unsigned int i) const { \
if (HB_UNLIKELY (i >= num)) return Null(Tag); \
return array[i].tag; \
}
#define DEFINE_ARRAY_INTERFACE(Type, name) \ #define DEFINE_ARRAY_INTERFACE(Type, name) \
inline const Type& get_##name (unsigned int i) const { \ inline const Type& get_##name (unsigned int i) const { \
@ -208,7 +191,6 @@ struct Null <Type> { \
*/ */
/* /*
* Data Types * Data Types
*/ */
@ -518,394 +500,4 @@ struct OpenTypeFontFile {
ASSERT_SIZE (OpenTypeFontFile, 4); ASSERT_SIZE (OpenTypeFontFile, 4);
/*
*
* OpenType Layout Common Table Formats
*
*/
/*
* Script, ScriptList, LangSys, Feature, FeatureList, Lookup, LookupList
*/
template <typename Type>
struct Record {
Tag tag; /* 4-byte Tag identifier */
OffsetTo<Type>
offset; /* Offset from beginning of object holding
* the Record */
};
template <typename Type>
struct RecordListOf : ArrayOf<Record<Type> > {
inline const Type& operator [] (unsigned int i) const {
if (HB_UNLIKELY (i >= this->len)) return Null(Type);
return this+this->array[i].offset;
}
inline const Tag& get_tag (unsigned int i) const {
if (HB_UNLIKELY (i >= this->len)) return Null(Tag);
return this->array[i].tag;
}
};
struct Script;
typedef Record<Script> ScriptRecord;
ASSERT_SIZE (ScriptRecord, 6);
struct LangSys;
typedef Record<LangSys> LangSysRecord;
ASSERT_SIZE (LangSysRecord, 6);
struct Feature;
typedef Record<Feature> FeatureRecord;
ASSERT_SIZE (FeatureRecord, 6);
struct LangSys {
inline const unsigned int get_feature_index (unsigned int i) const {
return featureIndex[i];
}
inline unsigned int get_feature_count (void) const {
return featureIndex.len;
}
inline const bool has_required_feature (void) const {
return reqFeatureIndex != 0xffff;
}
/* Returns NO_INDEX if none */
inline int get_required_feature_index (void) const {
if (reqFeatureIndex == 0xffff)
return NO_INDEX;
return reqFeatureIndex;;
}
Offset lookupOrder; /* = Null (reserved for an offset to a
* reordering table) */
USHORT reqFeatureIndex;/* Index of a feature required for this
* language system--if no required features
* = 0xFFFF */
ArrayOf<USHORT>
featureIndex; /* Array of indices into the FeatureList */
};
ASSERT_SIZE_DATA (LangSys, 6, "\0\0\xFF\xFF");
struct Script {
inline const LangSys& get_lang_sys (unsigned int i) const {
if (i == NO_INDEX) return get_default_lang_sys ();
return this+langSys[i].offset;
}
inline unsigned int get_lang_sys_count (void) const {
return langSys.len;
}
inline const Tag& get_lang_sys_tag (unsigned int i) const {
return langSys[i].tag;
}
// LONGTERMTODO bsearch
DEFINE_TAG_FIND_INTERFACE (LangSys, lang_sys); /* find_lang_sys_index (), get_lang_sys_by_tag (tag) */
inline const bool has_default_lang_sys (void) const {
return defaultLangSys != 0;
}
inline const LangSys& get_default_lang_sys (void) const {
return this+defaultLangSys;
}
private:
OffsetTo<LangSys>
defaultLangSys; /* Offset to DefaultLangSys table--from
* beginning of Script table--may be Null */
ArrayOf<LangSysRecord>
langSys; /* Array of LangSysRecords--listed
* alphabetically by LangSysTag */
};
ASSERT_SIZE (Script, 4);
typedef RecordListOf<Script> ScriptList;
ASSERT_SIZE (ScriptList, 2);
struct Feature {
inline const unsigned int get_lookup_index (unsigned int i) const {
return lookupIndex[i];
}
inline unsigned int get_lookup_count (void) const {
return lookupIndex.len;
}
/* TODO: implement get_feature_parameters() */
/* TODO: implement FeatureSize and other special features? */
Offset featureParams; /* Offset to Feature Parameters table (if one
* has been defined for the feature), relative
* to the beginning of the Feature Table; = Null
* if not required */
ArrayOf<USHORT>
lookupIndex; /* Array of LookupList indices */
};
ASSERT_SIZE (Feature, 4);
typedef RecordListOf<Feature> FeatureList;
ASSERT_SIZE (FeatureList, 2);
struct LookupFlag : USHORT {
static const unsigned int RightToLeft = 0x0001u;
static const unsigned int IgnoreBaseGlyphs = 0x0002u;
static const unsigned int IgnoreLigatures = 0x0004u;
static const unsigned int IgnoreMarks = 0x0008u;
static const unsigned int Reserved = 0x00F0u;
static const unsigned int MarkAttachmentType = 0xFF00u;
};
ASSERT_SIZE (LookupFlag, 2);
struct LookupSubTable {
private:
USHORT format; /* Subtable format. Different for GSUB and GPOS */
};
ASSERT_SIZE (LookupSubTable, 2);
struct Lookup {
inline const LookupSubTable& get_subtable (unsigned int i) const {
return this+subTable[i];
}
inline unsigned int get_subtable_count (void) const {
return subTable.len;
}
inline bool is_right_to_left (void) const { return lookupFlag & LookupFlag::RightToLeft; }
inline bool ignore_base_glyphs(void) const { return lookupFlag & LookupFlag::IgnoreBaseGlyphs; }
inline bool ignore_ligatures (void) const { return lookupFlag & LookupFlag::IgnoreLigatures; }
inline bool ignore_marks (void) const { return lookupFlag & LookupFlag::IgnoreMarks; }
inline unsigned int get_mark_attachment_type (void) const { return lookupFlag & LookupFlag::MarkAttachmentType; }
inline unsigned int get_type (void) const { return lookupType; }
inline unsigned int get_flag (void) const { return lookupFlag; }
USHORT lookupType; /* Different enumerations for GSUB and GPOS */
USHORT lookupFlag; /* Lookup qualifiers */
OffsetArrayOf<LookupSubTable>
subTable; /* Array of SubTables */
};
ASSERT_SIZE (Lookup, 6);
template <typename Type>
struct OffsetListOf : OffsetArrayOf<Type> {
inline const Type& operator [] (unsigned int i) const {
if (HB_UNLIKELY (i >= this->len)) return Null(Type);
return this+this->array[i];
}
};
typedef OffsetListOf<Lookup> LookupList;
ASSERT_SIZE (LookupList, 2);
/*
* Coverage Table
*/
struct CoverageFormat1 {
friend struct Coverage;
private:
inline unsigned int get_coverage (hb_codepoint_t glyph_id) const {
GlyphID gid;
if (HB_UNLIKELY (glyph_id > 65535))
return NOT_COVERED;
gid = glyph_id;
// TODO: bsearch
unsigned int num_glyphs = glyphArray.len;
for (unsigned int i = 0; i < num_glyphs; i++)
if (gid == glyphArray[i])
return i;
return NOT_COVERED;
}
USHORT coverageFormat; /* Format identifier--format = 1 */
ArrayOf<GlyphID>
glyphArray; /* Array of GlyphIDs--in numerical order */
};
ASSERT_SIZE (CoverageFormat1, 4);
struct CoverageRangeRecord {
friend struct CoverageFormat2;
private:
inline unsigned int get_coverage (hb_codepoint_t glyph_id) const {
if (glyph_id >= start && glyph_id <= end)
return startCoverageIndex + (glyph_id - start);
return NOT_COVERED;
}
private:
GlyphID start; /* First GlyphID in the range */
GlyphID end; /* Last GlyphID in the range */
USHORT startCoverageIndex; /* Coverage Index of first GlyphID in
* range */
};
ASSERT_SIZE_DATA (CoverageRangeRecord, 6, "\000\001");
struct CoverageFormat2 {
friend struct Coverage;
private:
inline unsigned int get_coverage (hb_codepoint_t glyph_id) const {
// TODO: bsearch
unsigned int count = rangeRecord.len;
for (unsigned int i = 0; i < count; i++) {
int coverage = rangeRecord[i].get_coverage (glyph_id);
if (coverage >= 0)
return coverage;
}
return NOT_COVERED;
}
USHORT coverageFormat; /* Format identifier--format = 2 */
ArrayOf<CoverageRangeRecord>
rangeRecord; /* Array of glyph ranges--ordered by
* Start GlyphID. rangeCount entries
* long */
};
ASSERT_SIZE (CoverageFormat2, 4);
struct Coverage {
unsigned int get_coverage (hb_codepoint_t glyph_id) const {
switch (u.format) {
case 1: return u.format1->get_coverage(glyph_id);
case 2: return u.format2->get_coverage(glyph_id);
default:return NOT_COVERED;
}
}
unsigned int operator() (hb_codepoint_t glyph_id) const {
return get_coverage (glyph_id);
}
private:
union {
USHORT format; /* Format identifier */
CoverageFormat1 format1[];
CoverageFormat2 format2[];
} u;
};
ASSERT_SIZE (Coverage, 2);
/*
* Class Definition Table
*/
struct ClassDefFormat1 {
friend struct ClassDef;
private:
inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const {
if ((unsigned int) (glyph_id - startGlyph) < classValue.len)
return classValue[glyph_id - startGlyph];
return 0;
}
USHORT classFormat; /* Format identifier--format = 1 */
GlyphID startGlyph; /* First GlyphID of the classValueArray */
ArrayOf<USHORT>
classValue; /* Array of Class Values--one per GlyphID */
};
ASSERT_SIZE (ClassDefFormat1, 6);
struct ClassRangeRecord {
friend struct ClassDefFormat2;
private:
inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const {
if (glyph_id >= start && glyph_id <= end)
return classValue;
return 0;
}
private:
GlyphID start; /* First GlyphID in the range */
GlyphID end; /* Last GlyphID in the range */
USHORT classValue; /* Applied to all glyphs in the range */
};
ASSERT_SIZE_DATA (ClassRangeRecord, 6, "\000\001");
struct ClassDefFormat2 {
friend struct ClassDef;
private:
inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const {
// TODO: bsearch
unsigned int count = rangeRecord.len;
for (unsigned int i = 0; i < count; i++) {
int classValue = rangeRecord[i].get_class (glyph_id);
if (classValue > 0)
return classValue;
}
return 0;
}
USHORT classFormat; /* Format identifier--format = 2 */
ArrayOf<ClassRangeRecord>
rangeRecord; /* Array of glyph ranges--ordered by
* Start GlyphID */
};
ASSERT_SIZE (ClassDefFormat2, 4);
struct ClassDef {
hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const {
switch (u.format) {
case 1: return u.format1->get_class(glyph_id);
case 2: return u.format2->get_class(glyph_id);
default:return 0;
}
}
private:
union {
USHORT format; /* Format identifier */
ClassDefFormat1 format1[];
ClassDefFormat2 format2[];
} u;
};
ASSERT_SIZE (ClassDef, 2);
/*
* Device Tables
*/
struct Device {
int get_delta (int ppem_size) const {
if (ppem_size >= startSize && ppem_size <= endSize &&
deltaFormat >= 1 && deltaFormat <= 3) {
int s = ppem_size - startSize;
int f = deltaFormat;
uint16_t byte = deltaValue[s >> (4 - f)];
uint16_t bits = byte >> (16 - (((s & ((1 << (4 - f)) - 1)) + 1) << f));
uint16_t mask = 0xFFFF >> (16 - (1 << f));
int delta = bits & mask;
if (delta >= ((mask + 1) >> 1))
delta -= mask + 1;
return delta;
}
return 0;
}
private:
USHORT startSize; /* Smallest size to correct--in ppem */
USHORT endSize; /* Largest size to correct--in ppem */
USHORT deltaFormat; /* Format of DeltaValue array data: 1, 2, or 3 */
USHORT deltaValue[]; /* Array of compressed data */
};
ASSERT_SIZE (Device, 6);
#endif /* HB_OT_LAYOUT_OPEN_PRIVATE_H */ #endif /* HB_OT_LAYOUT_OPEN_PRIVATE_H */