| /******************************************************************* |
| * |
| * ftxgpos.h |
| * |
| * TrueType Open GPOS table support |
| * |
| * Copyright 1996-2000 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 |
| #define GPOS_LOOKUP_EXTENSION 9 |
| |
| |
| /* A pointer to a function which loads a glyph. Its parameters are |
| the same as in a call to TT_Load_Glyph() -- if no glyph loading |
| function will be registered with TTO_GPOS_Register_Glyph_Function(), |
| TT_Load_Glyph() will be called indeed. The purpose of this function |
| pointer is to provide a hook for caching glyph outlines and sbits |
| (using the instance's generic pointer to hold the data). |
| |
| If for some reason no outline data is available (e.g. for an |
| embedded bitmap glyph), _glyph->outline.n_points should be set to |
| zero. _glyph can be computed with |
| |
| _glyph = HANDLE_Glyph( glyph ) */ |
| |
| typedef FT_Error (*TTO_GlyphFunction)(FT_Face face, |
| FT_UInt glyphIndex, |
| FT_Int loadFlags ); |
| |
| |
| /* A pointer to a function which accesses the PostScript interpreter. |
| Multiple Master fonts need this interface to convert a metric ID |
| (as stored in an OpenType font version 1.2 or higher) `metric_id' |
| into a metric value (returned in `metric_value'). |
| |
| `data' points to the user-defined structure specified during a |
| call to TT_GPOS_Register_MM_Function(). |
| |
| `metric_value' must be returned as a scaled value (but shouldn't |
| be rounded). */ |
| |
| typedef FT_Error (*TTO_MMFunction)(FT_Face face, |
| FT_UShort metric_id, |
| FT_Pos* metric_value, |
| void* data ); |
| |
| |
| struct TTO_GPOSHeader_ |
| { |
| FT_Memory memory; |
| |
| FT_Fixed Version; |
| |
| TTO_ScriptList ScriptList; |
| TTO_FeatureList FeatureList; |
| TTO_LookupList LookupList; |
| |
| TTO_GDEFHeader* gdef; |
| |
| /* the next field is used for a callback function to get the |
| glyph outline. */ |
| |
| TTO_GlyphFunction gfunc; |
| |
| /* this is OpenType 1.2 -- Multiple Master fonts need this |
| callback function to get various metric values from the |
| PostScript interpreter. */ |
| |
| TTO_MMFunction mmfunc; |
| void* data; |
| }; |
| |
| typedef struct TTO_GPOSHeader_ TTO_GPOSHeader; |
| typedef struct TTO_GPOSHeader_* TTO_GPOS; |
| |
| |
| /* shared tables */ |
| |
| struct TTO_ValueRecord_ |
| { |
| FT_Short XPlacement; /* horizontal adjustment for |
| placement */ |
| FT_Short YPlacement; /* vertical adjustment for |
| placement */ |
| FT_Short XAdvance; /* horizontal adjustment for |
| advance */ |
| FT_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 */ |
| FT_UShort XIdPlacement; /* horizontal placement metric ID */ |
| FT_UShort YIdPlacement; /* vertical placement metric ID */ |
| FT_UShort XIdAdvance; /* horizontal advance metric ID */ |
| FT_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_ |
| { |
| FT_Short XCoordinate; /* horizontal value */ |
| FT_Short YCoordinate; /* vertical value */ |
| }; |
| |
| typedef struct TTO_AnchorFormat1_ TTO_AnchorFormat1; |
| |
| |
| struct TTO_AnchorFormat2_ |
| { |
| FT_Short XCoordinate; /* horizontal value */ |
| FT_Short YCoordinate; /* vertical value */ |
| FT_UShort AnchorPoint; /* index to glyph contour point */ |
| }; |
| |
| typedef struct TTO_AnchorFormat2_ TTO_AnchorFormat2; |
| |
| |
| struct TTO_AnchorFormat3_ |
| { |
| FT_Short XCoordinate; /* horizontal value */ |
| FT_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_ |
| { |
| FT_UShort XIdAnchor; /* horizontal metric ID */ |
| FT_UShort YIdAnchor; /* vertical metric ID */ |
| }; |
| |
| typedef struct TTO_AnchorFormat4_ TTO_AnchorFormat4; |
| |
| |
| struct TTO_Anchor_ |
| { |
| FT_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_ |
| { |
| FT_UShort Class; /* mark class */ |
| TTO_Anchor MarkAnchor; /* anchor table */ |
| }; |
| |
| typedef struct TTO_MarkRecord_ TTO_MarkRecord; |
| |
| |
| struct TTO_MarkArray_ |
| { |
| FT_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_ |
| { |
| FT_UShort ValueCount; /* number of ValueRecord tables */ |
| TTO_ValueRecord* Value; /* array of ValueRecord tables */ |
| }; |
| |
| typedef struct TTO_SinglePosFormat2_ TTO_SinglePosFormat2; |
| |
| |
| struct TTO_SinglePos_ |
| { |
| FT_UShort PosFormat; /* 1 or 2 */ |
| TTO_Coverage Coverage; /* Coverage table */ |
| |
| FT_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_ |
| { |
| FT_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_ |
| { |
| FT_UShort PairValueCount; |
| /* number of PairValueRecord tables */ |
| TTO_PairValueRecord* PairValueRecord; |
| /* array of PairValueRecord tables */ |
| }; |
| |
| typedef struct TTO_PairSet_ TTO_PairSet; |
| |
| |
| struct TTO_PairPosFormat1_ |
| { |
| FT_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 */ |
| FT_UShort Class1Count; /* number of classes in ClassDef1 |
| table */ |
| FT_UShort Class2Count; /* number of classes in ClassDef2 |
| table */ |
| TTO_Class1Record* Class1Record; /* array of Class1Record tables */ |
| }; |
| |
| typedef struct TTO_PairPosFormat2_ TTO_PairPosFormat2; |
| |
| |
| struct TTO_PairPos_ |
| { |
| FT_UShort PosFormat; /* 1 or 2 */ |
| TTO_Coverage Coverage; /* Coverage table */ |
| FT_UShort ValueFormat1; /* format of ValueRecord table |
| for first glyph */ |
| FT_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_ |
| { |
| FT_UShort PosFormat; /* always 1 */ |
| TTO_Coverage Coverage; /* Coverage table */ |
| FT_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_ |
| { |
| FT_UShort BaseCount; /* number of BaseRecord tables */ |
| TTO_BaseRecord* BaseRecord; /* array of BaseRecord tables */ |
| }; |
| |
| typedef struct TTO_BaseArray_ TTO_BaseArray; |
| |
| |
| struct TTO_MarkBasePos_ |
| { |
| FT_UShort PosFormat; /* always 1 */ |
| TTO_Coverage MarkCoverage; /* mark glyph coverage table */ |
| TTO_Coverage BaseCoverage; /* base glyph coverage table */ |
| FT_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_ |
| { |
| FT_UShort ComponentCount; |
| /* number of ComponentRecord tables */ |
| TTO_ComponentRecord* ComponentRecord; |
| /* array of ComponentRecord tables */ |
| }; |
| |
| typedef struct TTO_LigatureAttach_ TTO_LigatureAttach; |
| |
| |
| struct TTO_LigatureArray_ |
| { |
| FT_UShort LigatureCount; /* number of LigatureAttach tables */ |
| TTO_LigatureAttach* LigatureAttach; |
| /* array of LigatureAttach tables */ |
| }; |
| |
| typedef struct TTO_LigatureArray_ TTO_LigatureArray; |
| |
| |
| struct TTO_MarkLigPos_ |
| { |
| FT_UShort PosFormat; /* always 1 */ |
| TTO_Coverage MarkCoverage; /* mark glyph coverage table */ |
| TTO_Coverage LigatureCoverage; |
| /* ligature glyph coverage table */ |
| FT_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_ |
| { |
| FT_UShort Mark2Count; /* number of Mark2Record tables */ |
| TTO_Mark2Record* Mark2Record; /* array of Mark2Record tables */ |
| }; |
| |
| typedef struct TTO_Mark2Array_ TTO_Mark2Array; |
| |
| |
| struct TTO_MarkMarkPos_ |
| { |
| FT_UShort PosFormat; /* always 1 */ |
| TTO_Coverage Mark1Coverage; /* first mark glyph coverage table */ |
| TTO_Coverage Mark2Coverage; /* second mark glyph coverave table */ |
| FT_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_ |
| { |
| FT_UShort SequenceIndex; /* index into current |
| glyph sequence */ |
| FT_UShort LookupListIndex; /* Lookup to apply to that pos. */ |
| }; |
| |
| typedef struct TTO_PosLookupRecord_ TTO_PosLookupRecord; |
| |
| |
| /* LookupType 7 */ |
| |
| struct TTO_PosRule_ |
| { |
| FT_UShort GlyphCount; /* total number of input glyphs */ |
| FT_UShort PosCount; /* number of PosLookupRecord tables */ |
| FT_UShort* Input; /* array of input glyph IDs */ |
| TTO_PosLookupRecord* PosLookupRecord; |
| /* array of PosLookupRecord tables */ |
| }; |
| |
| typedef struct TTO_PosRule_ TTO_PosRule; |
| |
| |
| struct TTO_PosRuleSet_ |
| { |
| FT_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 */ |
| FT_UShort PosRuleSetCount; /* number of PosRuleSet tables */ |
| TTO_PosRuleSet* PosRuleSet; /* array of PosRuleSet tables */ |
| }; |
| |
| typedef struct TTO_ContextPosFormat1_ TTO_ContextPosFormat1; |
| |
| |
| struct TTO_PosClassRule_ |
| { |
| FT_UShort GlyphCount; /* total number of context classes */ |
| FT_UShort PosCount; /* number of PosLookupRecord tables */ |
| FT_UShort* Class; /* array of classes */ |
| TTO_PosLookupRecord* PosLookupRecord; |
| /* array of PosLookupRecord tables */ |
| }; |
| |
| typedef struct TTO_PosClassRule_ TTO_PosClassRule; |
| |
| |
| struct TTO_PosClassSet_ |
| { |
| FT_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_ |
| { |
| FT_UShort MaxContextLength; |
| /* maximal context length */ |
| TTO_Coverage Coverage; /* Coverage table */ |
| TTO_ClassDefinition ClassDef; /* ClassDef table */ |
| FT_UShort PosClassSetCount; |
| /* number of PosClassSet tables */ |
| TTO_PosClassSet* PosClassSet; /* array of PosClassSet tables */ |
| }; |
| |
| typedef struct TTO_ContextPosFormat2_ TTO_ContextPosFormat2; |
| |
| |
| struct TTO_ContextPosFormat3_ |
| { |
| FT_UShort GlyphCount; /* number of input glyphs */ |
| FT_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_ |
| { |
| FT_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_ |
| { |
| FT_UShort BacktrackGlyphCount; |
| /* total number of backtrack glyphs */ |
| FT_UShort* Backtrack; /* array of backtrack glyph IDs */ |
| FT_UShort InputGlyphCount; |
| /* total number of input glyphs */ |
| FT_UShort* Input; /* array of input glyph IDs */ |
| FT_UShort LookaheadGlyphCount; |
| /* total number of lookahead glyphs */ |
| FT_UShort* Lookahead; /* array of lookahead glyph IDs */ |
| FT_UShort PosCount; /* number of PosLookupRecords */ |
| TTO_PosLookupRecord* PosLookupRecord; |
| /* array of PosLookupRecords */ |
| }; |
| |
| typedef struct TTO_ChainPosRule_ TTO_ChainPosRule; |
| |
| |
| struct TTO_ChainPosRuleSet_ |
| { |
| FT_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 */ |
| FT_UShort ChainPosRuleSetCount; |
| /* number of ChainPosRuleSet tables */ |
| TTO_ChainPosRuleSet* ChainPosRuleSet; |
| /* array of ChainPosRuleSet tables */ |
| }; |
| |
| typedef struct TTO_ChainContextPosFormat1_ TTO_ChainContextPosFormat1; |
| |
| |
| struct TTO_ChainPosClassRule_ |
| { |
| FT_UShort BacktrackGlyphCount; |
| /* total number of backtrack |
| classes */ |
| FT_UShort* Backtrack; /* array of backtrack classes */ |
| FT_UShort InputGlyphCount; |
| /* total number of context classes */ |
| FT_UShort* Input; /* array of context classes */ |
| FT_UShort LookaheadGlyphCount; |
| /* total number of lookahead |
| classes */ |
| FT_UShort* Lookahead; /* array of lookahead classes */ |
| FT_UShort PosCount; /* number of PosLookupRecords */ |
| TTO_PosLookupRecord* PosLookupRecord; |
| /* array of substitution lookups */ |
| }; |
| |
| typedef struct TTO_ChainPosClassRule_ TTO_ChainPosClassRule; |
| |
| |
| struct TTO_ChainPosClassSet_ |
| { |
| FT_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 */ |
| |
| FT_UShort MaxBacktrackLength; |
| /* maximal backtrack length */ |
| TTO_ClassDefinition BacktrackClassDef; |
| /* BacktrackClassDef table */ |
| FT_UShort MaxInputLength; |
| /* maximal input length */ |
| TTO_ClassDefinition InputClassDef; |
| /* InputClassDef table */ |
| FT_UShort MaxLookaheadLength; |
| /* maximal lookahead length */ |
| TTO_ClassDefinition LookaheadClassDef; |
| /* LookaheadClassDef table */ |
| |
| FT_UShort ChainPosClassSetCount; |
| /* number of ChainPosClassSet |
| tables */ |
| TTO_ChainPosClassSet* ChainPosClassSet; |
| /* array of ChainPosClassSet |
| tables */ |
| }; |
| |
| typedef struct TTO_ChainContextPosFormat2_ TTO_ChainContextPosFormat2; |
| |
| |
| struct TTO_ChainContextPosFormat3_ |
| { |
| FT_UShort BacktrackGlyphCount; |
| /* number of backtrack glyphs */ |
| TTO_Coverage* BacktrackCoverage; |
| /* array of backtrack Coverage |
| tables */ |
| FT_UShort InputGlyphCount; |
| /* number of input glyphs */ |
| TTO_Coverage* InputCoverage; |
| /* array of input coverage |
| tables */ |
| FT_UShort LookaheadGlyphCount; |
| /* number of lookahead glyphs */ |
| TTO_Coverage* LookaheadCoverage; |
| /* array of lookahead coverage |
| tables */ |
| FT_UShort PosCount; /* number of PosLookupRecords */ |
| TTO_PosLookupRecord* PosLookupRecord; |
| /* array of substitution lookups */ |
| }; |
| |
| typedef struct TTO_ChainContextPosFormat3_ TTO_ChainContextPosFormat3; |
| |
| |
| struct TTO_ChainContextPos_ |
| { |
| FT_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; |
| |
| |
| /* This `string object' is much simpler compared to TTO_GSUB_String. |
| A call to TTO_GPOS_Apply_String() will allocate it. */ |
| |
| struct TTO_GPOS_Data_ |
| { |
| FT_Pos x_pos; |
| FT_Pos y_pos; |
| FT_Pos x_advance; |
| FT_Pos y_advance; |
| FT_UShort back; /* number of glyphs to go back |
| for drawing current glyph */ |
| FT_Bool new_advance; /* if set, the advance width values are |
| absolute, i.e., they won't be |
| added to the original glyph's value |
| but rather replace them. */ |
| }; |
| |
| typedef struct TTO_GPOS_Data_ TTO_GPOS_Data; |
| |
| |
| /* finally, the GPOS API */ |
| |
| /* EXPORT_DEF |
| FT_Export ( FT_Error ) TT_Init_GPOS_Extension( TT_Engine engine ); */ |
| |
| EXPORT_DEF |
| FT_Error TT_Load_GPOS_Table( FT_Face face, |
| TTO_GPOSHeader** gpos, |
| TTO_GDEFHeader* gdef ); |
| |
| EXPORT_DEF |
| FT_Error TT_Done_GPOS_Table( TTO_GPOSHeader* gpos ); |
| |
| EXPORT_DEF |
| FT_Error TT_GPOS_Select_Script( TTO_GPOSHeader* gpos, |
| FT_ULong script_tag, |
| FT_UShort* script_index ); |
| EXPORT_DEF |
| FT_Error TT_GPOS_Select_Language( TTO_GPOSHeader* gpos, |
| FT_ULong language_tag, |
| FT_UShort script_index, |
| FT_UShort* language_index, |
| FT_UShort* req_feature_index ); |
| EXPORT_DEF |
| FT_Error TT_GPOS_Select_Feature( TTO_GPOSHeader* gpos, |
| FT_ULong feature_tag, |
| FT_UShort script_index, |
| FT_UShort language_index, |
| FT_UShort* feature_index ); |
| |
| EXPORT_DEF |
| FT_Error TT_GPOS_Query_Scripts( TTO_GPOSHeader* gpos, |
| FT_ULong** script_tag_list ); |
| EXPORT_DEF |
| FT_Error TT_GPOS_Query_Languages( TTO_GPOSHeader* gpos, |
| FT_UShort script_index, |
| FT_ULong** language_tag_list ); |
| EXPORT_DEF |
| FT_Error TT_GPOS_Query_Features( TTO_GPOSHeader* gpos, |
| FT_UShort script_index, |
| FT_UShort language_index, |
| FT_ULong** feature_tag_list ); |
| |
| EXPORT_DEF |
| FT_Error TT_GPOS_Add_Feature( TTO_GPOSHeader* gpos, |
| FT_UShort feature_index, |
| FT_UShort property ); |
| EXPORT_DEF |
| FT_Error TT_GPOS_Clear_Features( TTO_GPOSHeader* gpos ); |
| |
| EXPORT_DEF |
| FT_Error TT_GPOS_Register_Glyph_Function( TTO_GPOSHeader* gpos, |
| TTO_GlyphFunction gfunc ); |
| |
| EXPORT_DEF |
| FT_Error TT_GPOS_Register_MM_Function( TTO_GPOSHeader* gpos, |
| TTO_MMFunction mmfunc, |
| void* data ); |
| |
| /* If `dvi' is TRUE, glyph contour points for anchor points and device |
| tables are ignored -- you will get device independent values. */ |
| |
| EXPORT_DEF |
| FT_Error TT_GPOS_Apply_String( FT_Face face, |
| TTO_GPOSHeader* gpos, |
| FT_UShort load_flags, |
| TTO_GSUB_String* in, |
| TTO_GPOS_Data** out, |
| FT_Bool dvi, |
| FT_Bool r2l ); |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* FTXGPOS_H */ |
| |
| |
| /* END */ |
