768 lines
25 KiB
C
768 lines
25 KiB
C
/*******************************************************************
|
|
*
|
|
* ftxgpos.h
|
|
*
|
|
* TrueType Open GPOS table support
|
|
*
|
|
* Copyright 1996-1999 by
|
|
* David Turner, Robert Wilhelm, and Werner Lemberg.
|
|
*
|
|
* This file is part of the FreeType project, and may only be used
|
|
* modified and distributed under the terms of the FreeType project
|
|
* license, LICENSE.TXT. By continuing to use, modify, or distribute
|
|
* this file you indicate that you have read the license and
|
|
* understand and accept it fully.
|
|
*
|
|
******************************************************************/
|
|
|
|
#ifndef FTXOPEN_H
|
|
#error "Don't include this file! Use ftxopen.h instead."
|
|
#endif
|
|
|
|
#ifndef FTXGPOS_H
|
|
#define FTXGPOS_H
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#define TTO_Err_Invalid_GPOS_SubTable_Format 0x1020
|
|
#define TTO_Err_Invalid_GPOS_SubTable 0x1021
|
|
|
|
|
|
/* Lookup types for glyph positioning */
|
|
|
|
#define GPOS_LOOKUP_SINGLE 1
|
|
#define GPOS_LOOKUP_PAIR 2
|
|
#define GPOS_LOOKUP_CURSIVE 3
|
|
#define GPOS_LOOKUP_MARKBASE 4
|
|
#define GPOS_LOOKUP_MARKLIG 5
|
|
#define GPOS_LOOKUP_MARKMARK 6
|
|
#define GPOS_LOOKUP_CONTEXT 7
|
|
#define GPOS_LOOKUP_CHAIN 8
|
|
|
|
|
|
struct TTO_GPOSHeader_
|
|
{
|
|
TT_Bool loaded;
|
|
TT_ULong offset;
|
|
|
|
TT_Fixed Version;
|
|
|
|
TTO_ScriptList ScriptList;
|
|
TTO_FeatureList FeatureList;
|
|
TTO_LookupList LookupList;
|
|
|
|
TTO_GDEFHeader* gdef;
|
|
};
|
|
|
|
typedef struct TTO_GPOSHeader_ TTO_GPOSHeader;
|
|
|
|
|
|
/* shared tables */
|
|
|
|
struct TTO_ValueRecord_
|
|
{
|
|
TT_Short XPlacement; /* horizontal adjustment for
|
|
placement */
|
|
TT_Short YPlacement; /* vertical adjustment for
|
|
placement */
|
|
TT_Short XAdvance; /* horizontal adjustment for
|
|
advance */
|
|
TT_Short YAdvance; /* vertical adjustment for
|
|
advance */
|
|
TTO_Device XPlacementDevice; /* device table for horizontal
|
|
placement */
|
|
TTO_Device YPlacementDevice; /* device table for vertical
|
|
placement */
|
|
TTO_Device XAdvanceDevice; /* device table for horizontal
|
|
advance */
|
|
TTO_Device YAdvanceDevice; /* device table for vertical
|
|
advance */
|
|
TT_UShort XIdPlacement; /* horizontal placement metric ID */
|
|
TT_UShort YIdPlacement; /* vertical placement metric ID */
|
|
TT_UShort XIdAdvance; /* horizontal advance metric ID */
|
|
TT_UShort YIdAdvance; /* vertical advance metric ID */
|
|
};
|
|
|
|
typedef struct TTO_ValueRecord_ TTO_ValueRecord;
|
|
|
|
|
|
/* Mask values to scan the value format of the ValueRecord structure.
|
|
We always expand compressed ValueRecords of the font. */
|
|
|
|
#define HAVE_X_PLACEMENT 0x0001
|
|
#define HAVE_Y_PLACEMENT 0x0002
|
|
#define HAVE_X_ADVANCE 0x0004
|
|
#define HAVE_Y_ADVANCE 0x0008
|
|
#define HAVE_X_PLACEMENT_DEVICE 0x0010
|
|
#define HAVE_Y_PLACEMENT_DEVICE 0x0020
|
|
#define HAVE_X_ADVANCE_DEVICE 0x0040
|
|
#define HAVE_Y_ADVANCE_DEVICE 0x0080
|
|
#define HAVE_X_ID_PLACEMENT 0x0100
|
|
#define HAVE_Y_ID_PLACEMENT 0x0200
|
|
#define HAVE_X_ID_ADVANCE 0x0400
|
|
#define HAVE_Y_ID_ADVANCE 0x0800
|
|
|
|
|
|
struct TTO_AnchorFormat1_
|
|
{
|
|
TT_Short XCoordinate; /* horizontal value */
|
|
TT_Short YCoordinate; /* vertical value */
|
|
};
|
|
|
|
typedef struct TTO_AnchorFormat1_ TTO_AnchorFormat1;
|
|
|
|
|
|
struct TTO_AnchorFormat2_
|
|
{
|
|
TT_Short XCoordinate; /* horizontal value */
|
|
TT_Short YCoordinate; /* vertical value */
|
|
TT_UShort AnchorPoint; /* index to glyph contour point */
|
|
};
|
|
|
|
typedef struct TTO_AnchorFormat2_ TTO_AnchorFormat2;
|
|
|
|
|
|
struct TTO_AnchorFormat3_
|
|
{
|
|
TT_Short XCoordinate; /* horizontal value */
|
|
TT_Short YCoordinate; /* vertical value */
|
|
TTO_Device XDeviceTable; /* device table for X coordinate */
|
|
TTO_Device YDeviceTable; /* device table for Y coordinate */
|
|
};
|
|
|
|
typedef struct TTO_AnchorFormat3_ TTO_AnchorFormat3;
|
|
|
|
|
|
struct TTO_AnchorFormat4_
|
|
{
|
|
TT_UShort XIdAnchor; /* horizontal metric ID */
|
|
TT_UShort YIdAnchor; /* vertical metric ID */
|
|
};
|
|
|
|
typedef struct TTO_AnchorFormat4_ TTO_AnchorFormat4;
|
|
|
|
|
|
struct TTO_Anchor_
|
|
{
|
|
TT_UShort PosFormat; /* 1, 2, 3, or 4 -- 0 indicates
|
|
that there is no Anchor table */
|
|
|
|
union
|
|
{
|
|
TTO_AnchorFormat1 af1;
|
|
TTO_AnchorFormat2 af2;
|
|
TTO_AnchorFormat3 af3;
|
|
TTO_AnchorFormat4 af4;
|
|
} af;
|
|
};
|
|
|
|
typedef struct TTO_Anchor_ TTO_Anchor;
|
|
|
|
|
|
struct TTO_MarkRecord_
|
|
{
|
|
TT_UShort Class; /* mark class */
|
|
TTO_Anchor MarkAnchor; /* anchor table */
|
|
};
|
|
|
|
typedef struct TTO_MarkRecord_ TTO_MarkRecord;
|
|
|
|
|
|
struct TTO_MarkArray_
|
|
{
|
|
TT_UShort MarkCount; /* number of MarkRecord tables */
|
|
TTO_MarkRecord* MarkRecord; /* array of MarkRecord tables */
|
|
};
|
|
|
|
typedef struct TTO_MarkArray_ TTO_MarkArray;
|
|
|
|
|
|
/* LookupType 1 */
|
|
|
|
struct TTO_SinglePosFormat1_
|
|
{
|
|
TTO_ValueRecord Value; /* ValueRecord for all covered
|
|
glyphs */
|
|
};
|
|
|
|
typedef struct TTO_SinglePosFormat1_ TTO_SinglePosFormat1;
|
|
|
|
|
|
struct TTO_SinglePosFormat2_
|
|
{
|
|
TT_UShort ValueCount; /* number of ValueRecord tables */
|
|
TTO_ValueRecord* Value; /* array of ValueRecord tables */
|
|
};
|
|
|
|
typedef struct TTO_SinglePosFormat2_ TTO_SinglePosFormat2;
|
|
|
|
|
|
struct TTO_SinglePos_
|
|
{
|
|
TT_UShort PosFormat; /* 1 or 2 */
|
|
TTO_Coverage Coverage; /* Coverage table */
|
|
|
|
TT_UShort ValueFormat; /* format of ValueRecord table */
|
|
|
|
union
|
|
{
|
|
TTO_SinglePosFormat1 spf1;
|
|
TTO_SinglePosFormat2 spf2;
|
|
} spf;
|
|
};
|
|
|
|
typedef struct TTO_SinglePos_ TTO_SinglePos;
|
|
|
|
|
|
/* LookupType 2 */
|
|
|
|
struct TTO_PairValueRecord_
|
|
{
|
|
TT_UShort SecondGlyph; /* glyph ID for second glyph */
|
|
TTO_ValueRecord Value1; /* pos. data for first glyph */
|
|
TTO_ValueRecord Value2; /* pos. data for second glyph */
|
|
};
|
|
|
|
typedef struct TTO_PairValueRecord_ TTO_PairValueRecord;
|
|
|
|
|
|
struct TTO_PairSet_
|
|
{
|
|
TT_UShort PairValueCount;
|
|
/* number of PairValueRecord tables */
|
|
TTO_PairValueRecord* PairValueRecord;
|
|
/* array of PairValueRecord tables */
|
|
};
|
|
|
|
typedef struct TTO_PairSet_ TTO_PairSet;
|
|
|
|
|
|
struct TTO_PairPosFormat1_
|
|
{
|
|
TT_UShort PairSetCount; /* number of PairSet tables */
|
|
TTO_PairSet* PairSet; /* array of PairSet tables */
|
|
};
|
|
|
|
typedef struct TTO_PairPosFormat1_ TTO_PairPosFormat1;
|
|
|
|
|
|
struct TTO_Class2Record_
|
|
{
|
|
TTO_ValueRecord Value1; /* pos. data for first glyph */
|
|
TTO_ValueRecord Value2; /* pos. data for second glyph */
|
|
};
|
|
|
|
typedef struct TTO_Class2Record_ TTO_Class2Record;
|
|
|
|
|
|
struct TTO_Class1Record_
|
|
{
|
|
TTO_Class2Record* Class2Record; /* array of Class2Record tables */
|
|
};
|
|
|
|
typedef struct TTO_Class1Record_ TTO_Class1Record;
|
|
|
|
|
|
struct TTO_PairPosFormat2_
|
|
{
|
|
TTO_ClassDefinition ClassDef1; /* class def. for first glyph */
|
|
TTO_ClassDefinition ClassDef2; /* class def. for second glyph */
|
|
TT_UShort Class1Count; /* number of classes in ClassDef1
|
|
table */
|
|
TT_UShort Class2Count; /* number of classes in ClassDef2
|
|
table */
|
|
TTO_Class1Record* Class1Record; /* array of Class1Record tables */
|
|
};
|
|
|
|
typedef struct TTO_PairPosFormat2_ TTO_PairPosFormat2;
|
|
|
|
|
|
struct TTO_PairPos_
|
|
{
|
|
TT_UShort PosFormat; /* 1 or 2 */
|
|
TTO_Coverage Coverage; /* Coverage table */
|
|
TT_UShort ValueFormat1; /* format of ValueRecord table
|
|
for first glyph */
|
|
TT_UShort ValueFormat2; /* format of ValueRecord table
|
|
for second glyph */
|
|
|
|
union
|
|
{
|
|
TTO_PairPosFormat1 ppf1;
|
|
TTO_PairPosFormat2 ppf2;
|
|
} ppf;
|
|
};
|
|
|
|
typedef struct TTO_PairPos_ TTO_PairPos;
|
|
|
|
|
|
/* LookupType 3 */
|
|
|
|
struct TTO_EntryExitRecord_
|
|
{
|
|
TTO_Anchor EntryAnchor; /* entry Anchor table */
|
|
TTO_Anchor ExitAnchor; /* exit Anchor table */
|
|
};
|
|
|
|
|
|
typedef struct TTO_EntryExitRecord_ TTO_EntryExitRecord;
|
|
|
|
struct TTO_CursivePos_
|
|
{
|
|
TT_UShort PosFormat; /* always 1 */
|
|
TTO_Coverage Coverage; /* Coverage table */
|
|
TT_UShort EntryExitCount;
|
|
/* number of EntryExitRecord tables */
|
|
TTO_EntryExitRecord* EntryExitRecord;
|
|
/* array of EntryExitRecord tables */
|
|
};
|
|
|
|
typedef struct TTO_CursivePos_ TTO_CursivePos;
|
|
|
|
|
|
/* LookupType 4 */
|
|
|
|
struct TTO_BaseRecord_
|
|
{
|
|
TTO_Anchor* BaseAnchor; /* array of base glyph anchor
|
|
tables */
|
|
};
|
|
|
|
typedef struct TTO_BaseRecord_ TTO_BaseRecord;
|
|
|
|
|
|
struct TTO_BaseArray_
|
|
{
|
|
TT_UShort BaseCount; /* number of BaseRecord tables */
|
|
TTO_BaseRecord* BaseRecord; /* array of BaseRecord tables */
|
|
};
|
|
|
|
typedef struct TTO_BaseArray_ TTO_BaseArray;
|
|
|
|
|
|
struct TTO_MarkBasePos_
|
|
{
|
|
TT_UShort PosFormat; /* always 1 */
|
|
TTO_Coverage MarkCoverage; /* mark glyph coverage table */
|
|
TTO_Coverage BaseCoverage; /* base glyph coverage table */
|
|
TT_UShort ClassCount; /* number of mark classes */
|
|
TTO_MarkArray MarkArray; /* mark array table */
|
|
TTO_BaseArray BaseArray; /* base array table */
|
|
};
|
|
|
|
typedef struct TTO_MarkBasePos_ TTO_MarkBasePos;
|
|
|
|
|
|
/* LookupType 5 */
|
|
|
|
struct TTO_ComponentRecord_
|
|
{
|
|
TTO_Anchor* LigatureAnchor; /* array of ligature glyph anchor
|
|
tables */
|
|
};
|
|
|
|
typedef struct TTO_ComponentRecord_ TTO_ComponentRecord;
|
|
|
|
|
|
struct TTO_LigatureAttach_
|
|
{
|
|
TT_UShort ComponentCount;
|
|
/* number of ComponentRecord tables */
|
|
TTO_ComponentRecord* ComponentRecord;
|
|
/* array of ComponentRecord tables */
|
|
};
|
|
|
|
typedef struct TTO_LigatureAttach_ TTO_LigatureAttach;
|
|
|
|
|
|
struct TTO_LigatureArray_
|
|
{
|
|
TT_UShort LigatureCount; /* number of LigatureAttach tables */
|
|
TTO_LigatureAttach* LigatureAttach;
|
|
/* array of LigatureAttach tables */
|
|
};
|
|
|
|
typedef struct TTO_LigatureArray_ TTO_LigatureArray;
|
|
|
|
|
|
struct TTO_MarkLigPos_
|
|
{
|
|
TT_UShort PosFormat; /* always 1 */
|
|
TTO_Coverage MarkCoverage; /* mark glyph coverage table */
|
|
TTO_Coverage LigatureCoverage;
|
|
/* ligature glyph coverage table */
|
|
TT_UShort ClassCount; /* number of mark classes */
|
|
TTO_MarkArray MarkArray; /* mark array table */
|
|
TTO_LigatureArray LigatureArray; /* ligature array table */
|
|
};
|
|
|
|
typedef struct TTO_MarkLigPos_ TTO_MarkLigPos;
|
|
|
|
|
|
/* LookupType 6 */
|
|
|
|
struct TTO_Mark2Record_
|
|
{
|
|
TTO_Anchor* Mark2Anchor; /* array of mark glyph anchor
|
|
tables */
|
|
};
|
|
|
|
typedef struct TTO_Mark2Record_ TTO_Mark2Record;
|
|
|
|
|
|
struct TTO_Mark2Array_
|
|
{
|
|
TT_UShort Mark2Count; /* number of Mark2Record tables */
|
|
TTO_Mark2Record* Mark2Record; /* array of Mark2Record tables */
|
|
};
|
|
|
|
typedef struct TTO_Mark2Array_ TTO_Mark2Array;
|
|
|
|
|
|
struct TTO_MarkMarkPos_
|
|
{
|
|
TT_UShort PosFormat; /* always 1 */
|
|
TTO_Coverage Mark1Coverage; /* first mark glyph coverage table */
|
|
TTO_Coverage Mark2Coverage; /* second mark glyph coverave table */
|
|
TT_UShort ClassCount; /* number of combining mark classes */
|
|
TTO_MarkArray Mark1Array; /* MarkArray table for first mark */
|
|
TTO_Mark2Array Mark2Array; /* MarkArray table for second mark */
|
|
};
|
|
|
|
typedef struct TTO_MarkMarkPos_ TTO_MarkMarkPos;
|
|
|
|
|
|
/* needed by both lookup type 7 and 8 */
|
|
|
|
struct TTO_PosLookupRecord_
|
|
{
|
|
TT_UShort SequenceIndex; /* index into current
|
|
glyph sequence */
|
|
TT_UShort LookupListIndex; /* Lookup to apply to that pos. */
|
|
};
|
|
|
|
typedef struct TTO_PosLookupRecord_ TTO_PosLookupRecord;
|
|
|
|
|
|
/* LookupType 7 */
|
|
|
|
struct TTO_PosRule_
|
|
{
|
|
TT_UShort GlyphCount; /* total number of input glyphs */
|
|
TT_UShort PosCount; /* number of PosLookupRecord tables */
|
|
TT_UShort* Input; /* array of input glyph IDs */
|
|
TTO_PosLookupRecord* PosLookupRecord;
|
|
/* array of PosLookupRecord tables */
|
|
};
|
|
|
|
typedef struct TTO_PosRule_ TTO_PosRule;
|
|
|
|
|
|
struct TTO_PosRuleSet_
|
|
{
|
|
TT_UShort PosRuleCount; /* number of PosRule tables */
|
|
TTO_PosRule* PosRule; /* array of PosRule tables */
|
|
};
|
|
|
|
typedef struct TTO_PosRuleSet_ TTO_PosRuleSet;
|
|
|
|
|
|
struct TTO_ContextPosFormat1_
|
|
{
|
|
TTO_Coverage Coverage; /* Coverage table */
|
|
TT_UShort PosRuleSetCount; /* number of PosRuleSet tables */
|
|
TTO_PosRuleSet* PosRuleSet; /* array of PosRuleSet tables */
|
|
};
|
|
|
|
typedef struct TTO_ContextPosFormat1_ TTO_ContextPosFormat1;
|
|
|
|
|
|
struct TTO_PosClassRule_
|
|
{
|
|
TT_UShort GlyphCount; /* total number of context classes */
|
|
TT_UShort PosCount; /* number of PosLookupRecord tables */
|
|
TT_UShort* Class; /* array of classes */
|
|
TTO_PosLookupRecord* PosLookupRecord;
|
|
/* array of PosLookupRecord tables */
|
|
};
|
|
|
|
typedef struct TTO_PosClassRule_ TTO_PosClassRule;
|
|
|
|
|
|
struct TTO_PosClassSet_
|
|
{
|
|
TT_UShort PosClassRuleCount;
|
|
/* number of PosClassRule tables */
|
|
TTO_PosClassRule* PosClassRule; /* array of PosClassRule tables */
|
|
};
|
|
|
|
typedef struct TTO_PosClassSet_ TTO_PosClassSet;
|
|
|
|
|
|
/* The `MaxContextLength' field is not defined in the TTO specification
|
|
but simplifies the implementation of this format. It holds the
|
|
maximal context length used in the context rules. */
|
|
|
|
struct TTO_ContextPosFormat2_
|
|
{
|
|
TT_UShort MaxContextLength;
|
|
/* maximal context length */
|
|
TTO_Coverage Coverage; /* Coverage table */
|
|
TTO_ClassDefinition ClassDef; /* ClassDef table */
|
|
TT_UShort PosClassSetCount;
|
|
/* number of PosClassSet tables */
|
|
TTO_PosClassSet* PosClassSet; /* array of PosClassSet tables */
|
|
};
|
|
|
|
typedef struct TTO_ContextPosFormat2_ TTO_ContextPosFormat2;
|
|
|
|
|
|
struct TTO_ContextPosFormat3_
|
|
{
|
|
TT_UShort GlyphCount; /* number of input glyphs */
|
|
TT_UShort PosCount; /* number of PosLookupRecord tables */
|
|
TTO_Coverage* Coverage; /* array of Coverage tables */
|
|
TTO_PosLookupRecord* PosLookupRecord;
|
|
/* array of PosLookupRecord tables */
|
|
};
|
|
|
|
typedef struct TTO_ContextPosFormat3_ TTO_ContextPosFormat3;
|
|
|
|
|
|
struct TTO_ContextPos_
|
|
{
|
|
TT_UShort PosFormat; /* 1, 2, or 3 */
|
|
|
|
union
|
|
{
|
|
TTO_ContextPosFormat1 cpf1;
|
|
TTO_ContextPosFormat2 cpf2;
|
|
TTO_ContextPosFormat3 cpf3;
|
|
} cpf;
|
|
};
|
|
|
|
typedef struct TTO_ContextPos_ TTO_ContextPos;
|
|
|
|
|
|
/* LookupType 8 */
|
|
|
|
struct TTO_ChainPosRule_
|
|
{
|
|
TT_UShort BacktrackGlyphCount;
|
|
/* total number of backtrack glyphs */
|
|
TT_UShort* Backtrack; /* array of backtrack glyph IDs */
|
|
TT_UShort InputGlyphCount;
|
|
/* total number of input glyphs */
|
|
TT_UShort* Input; /* array of input glyph IDs */
|
|
TT_UShort LookaheadGlyphCount;
|
|
/* total number of lookahead glyphs */
|
|
TT_UShort* Lookahead; /* array of lookahead glyph IDs */
|
|
TT_UShort PosCount; /* number of PosLookupRecords */
|
|
TTO_PosLookupRecord* PosLookupRecord;
|
|
/* array of PosLookupRecords */
|
|
};
|
|
|
|
typedef struct TTO_ChainPosRule_ TTO_ChainPosRule;
|
|
|
|
|
|
struct TTO_ChainPosRuleSet_
|
|
{
|
|
TT_UShort ChainPosRuleCount;
|
|
/* number of ChainPosRule tables */
|
|
TTO_ChainPosRule* ChainPosRule; /* array of ChainPosRule tables */
|
|
};
|
|
|
|
typedef struct TTO_ChainPosRuleSet_ TTO_ChainPosRuleSet;
|
|
|
|
|
|
struct TTO_ChainContextPosFormat1_
|
|
{
|
|
TTO_Coverage Coverage; /* Coverage table */
|
|
TT_UShort ChainPosRuleSetCount;
|
|
/* number of ChainPosRuleSet tables */
|
|
TTO_ChainPosRuleSet* ChainPosRuleSet;
|
|
/* array of ChainPosRuleSet tables */
|
|
};
|
|
|
|
typedef struct TTO_ChainContextPosFormat1_ TTO_ChainContextPosFormat1;
|
|
|
|
|
|
struct TTO_ChainPosClassRule_
|
|
{
|
|
TT_UShort BacktrackGlyphCount;
|
|
/* total number of backtrack
|
|
classes */
|
|
TT_UShort* Backtrack; /* array of backtrack classes */
|
|
TT_UShort InputGlyphCount;
|
|
/* total number of context classes */
|
|
TT_UShort* Input; /* array of context classes */
|
|
TT_UShort LookaheadGlyphCount;
|
|
/* total number of lookahead
|
|
classes */
|
|
TT_UShort* Lookahead; /* array of lookahead classes */
|
|
TT_UShort PosCount; /* number of PosLookupRecords */
|
|
TTO_PosLookupRecord* PosLookupRecord;
|
|
/* array of substitution lookups */
|
|
};
|
|
|
|
typedef struct TTO_ChainPosClassRule_ TTO_ChainPosClassRule;
|
|
|
|
|
|
struct TTO_ChainPosClassSet_
|
|
{
|
|
TT_UShort ChainPosClassRuleCount;
|
|
/* number of ChainPosClassRule
|
|
tables */
|
|
TTO_ChainPosClassRule* ChainPosClassRule;
|
|
/* array of ChainPosClassRule
|
|
tables */
|
|
};
|
|
|
|
typedef struct TTO_ChainPosClassSet_ TTO_ChainPosClassSet;
|
|
|
|
|
|
/* The `MaxXXXLength' fields are not defined in the TTO specification
|
|
but simplifies the implementation of this format. It holds the
|
|
maximal context length used in the specific context rules. */
|
|
|
|
struct TTO_ChainContextPosFormat2_
|
|
{
|
|
TTO_Coverage Coverage; /* Coverage table */
|
|
|
|
TT_UShort MaxBacktrackLength;
|
|
/* maximal backtrack length */
|
|
TTO_ClassDefinition BacktrackClassDef;
|
|
/* BacktrackClassDef table */
|
|
TT_UShort MaxInputLength;
|
|
/* maximal input length */
|
|
TTO_ClassDefinition InputClassDef;
|
|
/* InputClassDef table */
|
|
TT_UShort MaxLookaheadLength;
|
|
/* maximal lookahead length */
|
|
TTO_ClassDefinition LookaheadClassDef;
|
|
/* LookaheadClassDef table */
|
|
|
|
TT_UShort ChainPosClassSetCount;
|
|
/* number of ChainPosClassSet
|
|
tables */
|
|
TTO_ChainPosClassSet* ChainPosClassSet;
|
|
/* array of ChainPosClassSet
|
|
tables */
|
|
};
|
|
|
|
typedef struct TTO_ChainContextPosFormat2_ TTO_ChainContextPosFormat2;
|
|
|
|
|
|
struct TTO_ChainContextPosFormat3_
|
|
{
|
|
TT_UShort BacktrackGlyphCount;
|
|
/* number of backtrack glyphs */
|
|
TTO_Coverage* BacktrackCoverage;
|
|
/* array of backtrack Coverage
|
|
tables */
|
|
TT_UShort InputGlyphCount;
|
|
/* number of input glyphs */
|
|
TTO_Coverage* InputCoverage;
|
|
/* array of input coverage
|
|
tables */
|
|
TT_UShort LookaheadGlyphCount;
|
|
/* number of lookahead glyphs */
|
|
TTO_Coverage* LookaheadCoverage;
|
|
/* array of lookahead coverage
|
|
tables */
|
|
TT_UShort PosCount; /* number of PosLookupRecords */
|
|
TTO_PosLookupRecord* PosLookupRecord;
|
|
/* array of substitution lookups */
|
|
};
|
|
|
|
typedef struct TTO_ChainContextPosFormat3_ TTO_ChainContextPosFormat3;
|
|
|
|
|
|
struct TTO_ChainContextPos_
|
|
{
|
|
TT_UShort PosFormat; /* 1, 2, or 3 */
|
|
|
|
union
|
|
{
|
|
TTO_ChainContextPosFormat1 ccpf1;
|
|
TTO_ChainContextPosFormat2 ccpf2;
|
|
TTO_ChainContextPosFormat3 ccpf3;
|
|
} ccpf;
|
|
};
|
|
|
|
typedef struct TTO_ChainContextPos_ TTO_ChainContextPos;
|
|
|
|
|
|
union TTO_GPOS_SubTable_
|
|
{
|
|
TTO_SinglePos single;
|
|
TTO_PairPos pair;
|
|
TTO_CursivePos cursive;
|
|
TTO_MarkBasePos markbase;
|
|
TTO_MarkLigPos marklig;
|
|
TTO_MarkMarkPos markmark;
|
|
TTO_ContextPos context;
|
|
TTO_ChainContextPos chain;
|
|
};
|
|
|
|
typedef union TTO_GPOS_SubTable_ TTO_GPOS_SubTable;
|
|
|
|
|
|
/* finally, the GPOS API */
|
|
|
|
EXPORT_DEF
|
|
TT_Error TT_Init_GPOS_Extension( TT_Engine engine );
|
|
|
|
EXPORT_DEF
|
|
TT_Error TT_Load_GPOS_Table( TT_Face face,
|
|
TTO_GPOSHeader* gpos,
|
|
TTO_GDEFHeader* gdef );
|
|
|
|
EXPORT_DEF
|
|
TT_Error TT_GPOS_Select_Script( TTO_GPOSHeader* gpos,
|
|
TT_ULong script_tag,
|
|
TT_UShort* script_index );
|
|
EXPORT_DEF
|
|
TT_Error TT_GPOS_Select_Language( TTO_GPOSHeader* gpos,
|
|
TT_ULong language_tag,
|
|
TT_UShort script_index,
|
|
TT_UShort* language_index,
|
|
TT_UShort* req_feature_index );
|
|
EXPORT_DEF
|
|
TT_Error TT_GPOS_Select_Feature( TTO_GPOSHeader* gpos,
|
|
TT_ULong feature_tag,
|
|
TT_UShort script_index,
|
|
TT_UShort language_index,
|
|
TT_UShort* feature_index );
|
|
|
|
EXPORT_DEF
|
|
TT_Error TT_GPOS_Query_Scripts( TTO_GPOSHeader* gpos,
|
|
TT_ULong** script_tag_list );
|
|
EXPORT_DEF
|
|
TT_Error TT_GPOS_Query_Languages( TTO_GPOSHeader* gpos,
|
|
TT_UShort script_index,
|
|
TT_ULong** language_tag_list );
|
|
EXPORT_DEF
|
|
TT_Error TT_GPOS_Query_Features( TTO_GPOSHeader* gpos,
|
|
TT_UShort script_index,
|
|
TT_UShort language_index,
|
|
TT_ULong** feature_tag_list );
|
|
|
|
EXPORT_DEF
|
|
TT_Error TT_GPOS_Add_Feature( TTO_GPOSHeader* gpos,
|
|
TT_UShort feature_index,
|
|
TT_UShort property );
|
|
EXPORT_DEF
|
|
TT_Error TT_GPOS_Clear_Features( TTO_GPOSHeader* gpos );
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* FTXGPOS_H */
|
|
|
|
|
|
/* END */
|