699 lines
20 KiB
C
699 lines
20 KiB
C
/*******************************************************************
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*
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* Copyright 1996-2000 by
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* David Turner, Robert Wilhelm, and Werner Lemberg.
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*
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* Copyright 2006 Behdad Esfahbod
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*
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* This is part of HarfBuzz, an OpenType Layout engine library.
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*
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* See the file name COPYING for licensing information.
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*
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******************************************************************/
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#ifndef HARFBUZZ_GPOS_PRIVATE_H
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#define HARFBUZZ_GPOS_PRIVATE_H
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#include "harfbuzz-impl.h"
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#include "harfbuzz-gpos.h"
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HB_BEGIN_HEADER
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/* shared tables */
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struct HB_ValueRecord_
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{
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HB_Short XPlacement; /* horizontal adjustment for
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placement */
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HB_Short YPlacement; /* vertical adjustment for
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placement */
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HB_Short XAdvance; /* horizontal adjustment for
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advance */
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HB_Short YAdvance; /* vertical adjustment for
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advance */
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HB_Device XPlacementDevice; /* device table for horizontal
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placement */
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HB_Device YPlacementDevice; /* device table for vertical
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placement */
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HB_Device XAdvanceDevice; /* device table for horizontal
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advance */
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HB_Device YAdvanceDevice; /* device table for vertical
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advance */
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HB_UShort XIdPlacement; /* horizontal placement metric ID */
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HB_UShort YIdPlacement; /* vertical placement metric ID */
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HB_UShort XIdAdvance; /* horizontal advance metric ID */
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HB_UShort YIdAdvance; /* vertical advance metric ID */
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};
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typedef struct HB_ValueRecord_ HB_ValueRecord;
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/* Mask values to scan the value format of the ValueRecord structure.
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We always expand compressed ValueRecords of the font. */
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#define HB_GPOS_FORMAT_HAVE_X_PLACEMENT 0x0001
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#define HB_GPOS_FORMAT_HAVE_Y_PLACEMENT 0x0002
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#define HB_GPOS_FORMAT_HAVE_X_ADVANCE 0x0004
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#define HB_GPOS_FORMAT_HAVE_Y_ADVANCE 0x0008
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#define HB_GPOS_FORMAT_HAVE_X_PLACEMENT_DEVICE 0x0010
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#define HB_GPOS_FORMAT_HAVE_Y_PLACEMENT_DEVICE 0x0020
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#define HB_GPOS_FORMAT_HAVE_X_ADVANCE_DEVICE 0x0040
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#define HB_GPOS_FORMAT_HAVE_Y_ADVANCE_DEVICE 0x0080
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#define HB_GPOS_FORMAT_HAVE_X_ID_PLACEMENT 0x0100
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#define HB_GPOS_FORMAT_HAVE_Y_ID_PLACEMENT 0x0200
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#define HB_GPOS_FORMAT_HAVE_X_ID_ADVANCE 0x0400
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#define HB_GPOS_FORMAT_HAVE_Y_ID_ADVANCE 0x0800
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struct HB_AnchorFormat1_
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{
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HB_Short XCoordinate; /* horizontal value */
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HB_Short YCoordinate; /* vertical value */
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};
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typedef struct HB_AnchorFormat1_ HB_AnchorFormat1;
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struct HB_AnchorFormat2_
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{
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HB_Short XCoordinate; /* horizontal value */
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HB_Short YCoordinate; /* vertical value */
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HB_UShort AnchorPoint; /* index to glyph contour point */
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};
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typedef struct HB_AnchorFormat2_ HB_AnchorFormat2;
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struct HB_AnchorFormat3_
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{
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HB_Short XCoordinate; /* horizontal value */
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HB_Short YCoordinate; /* vertical value */
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HB_Device XDeviceTable; /* device table for X coordinate */
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HB_Device YDeviceTable; /* device table for Y coordinate */
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};
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typedef struct HB_AnchorFormat3_ HB_AnchorFormat3;
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struct HB_AnchorFormat4_
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{
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HB_UShort XIdAnchor; /* horizontal metric ID */
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HB_UShort YIdAnchor; /* vertical metric ID */
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};
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typedef struct HB_AnchorFormat4_ HB_AnchorFormat4;
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struct HB_Anchor_
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{
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HB_UShort PosFormat; /* 1, 2, 3, or 4 -- 0 indicates
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that there is no Anchor table */
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union
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{
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HB_AnchorFormat1 af1;
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HB_AnchorFormat2 af2;
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HB_AnchorFormat3 af3;
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HB_AnchorFormat4 af4;
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} af;
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};
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typedef struct HB_Anchor_ HB_Anchor;
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struct HB_MarkRecord_
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{
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HB_UShort Class; /* mark class */
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HB_Anchor MarkAnchor; /* anchor table */
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};
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typedef struct HB_MarkRecord_ HB_MarkRecord;
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struct HB_MarkArray_
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{
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HB_UShort MarkCount; /* number of MarkRecord tables */
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HB_MarkRecord* MarkRecord; /* array of MarkRecord tables */
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};
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typedef struct HB_MarkArray_ HB_MarkArray;
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/* LookupType 1 */
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struct HB_SinglePosFormat1_
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{
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HB_ValueRecord Value; /* ValueRecord for all covered
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glyphs */
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};
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typedef struct HB_SinglePosFormat1_ HB_SinglePosFormat1;
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struct HB_SinglePosFormat2_
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{
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HB_UShort ValueCount; /* number of ValueRecord tables */
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HB_ValueRecord* Value; /* array of ValueRecord tables */
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};
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typedef struct HB_SinglePosFormat2_ HB_SinglePosFormat2;
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struct HB_SinglePos_
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{
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HB_UShort PosFormat; /* 1 or 2 */
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HB_Coverage Coverage; /* Coverage table */
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HB_UShort ValueFormat; /* format of ValueRecord table */
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union
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{
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HB_SinglePosFormat1 spf1;
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HB_SinglePosFormat2 spf2;
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} spf;
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};
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typedef struct HB_SinglePos_ HB_SinglePos;
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/* LookupType 2 */
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struct HB_PairValueRecord_
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{
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HB_UShort SecondGlyph; /* glyph ID for second glyph */
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HB_ValueRecord Value1; /* pos. data for first glyph */
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HB_ValueRecord Value2; /* pos. data for second glyph */
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};
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typedef struct HB_PairValueRecord_ HB_PairValueRecord;
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struct HB_PairSet_
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{
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HB_UShort PairValueCount;
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/* number of PairValueRecord tables */
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HB_PairValueRecord* PairValueRecord;
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/* array of PairValueRecord tables */
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};
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typedef struct HB_PairSet_ HB_PairSet;
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struct HB_PairPosFormat1_
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{
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HB_UShort PairSetCount; /* number of PairSet tables */
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HB_PairSet* PairSet; /* array of PairSet tables */
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};
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typedef struct HB_PairPosFormat1_ HB_PairPosFormat1;
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struct HB_Class2Record_
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{
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HB_ValueRecord Value1; /* pos. data for first glyph */
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HB_ValueRecord Value2; /* pos. data for second glyph */
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};
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typedef struct HB_Class2Record_ HB_Class2Record;
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struct HB_Class1Record_
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{
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HB_Class2Record* Class2Record; /* array of Class2Record tables */
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};
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typedef struct HB_Class1Record_ HB_Class1Record;
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struct HB_PairPosFormat2_
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{
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HB_ClassDefinition ClassDef1; /* class def. for first glyph */
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HB_ClassDefinition ClassDef2; /* class def. for second glyph */
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HB_UShort Class1Count; /* number of classes in ClassDef1
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table */
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HB_UShort Class2Count; /* number of classes in ClassDef2
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table */
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HB_Class1Record* Class1Record; /* array of Class1Record tables */
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};
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typedef struct HB_PairPosFormat2_ HB_PairPosFormat2;
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struct HB_PairPos_
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{
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HB_UShort PosFormat; /* 1 or 2 */
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HB_Coverage Coverage; /* Coverage table */
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HB_UShort ValueFormat1; /* format of ValueRecord table
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for first glyph */
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HB_UShort ValueFormat2; /* format of ValueRecord table
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for second glyph */
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union
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{
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HB_PairPosFormat1 ppf1;
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HB_PairPosFormat2 ppf2;
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} ppf;
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};
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typedef struct HB_PairPos_ HB_PairPos;
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/* LookupType 3 */
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struct HB_EntryExitRecord_
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{
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HB_Anchor EntryAnchor; /* entry Anchor table */
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HB_Anchor ExitAnchor; /* exit Anchor table */
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};
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typedef struct HB_EntryExitRecord_ HB_EntryExitRecord;
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struct HB_CursivePos_
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{
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HB_UShort PosFormat; /* always 1 */
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HB_Coverage Coverage; /* Coverage table */
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HB_UShort EntryExitCount;
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/* number of EntryExitRecord tables */
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HB_EntryExitRecord* EntryExitRecord;
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/* array of EntryExitRecord tables */
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};
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typedef struct HB_CursivePos_ HB_CursivePos;
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/* LookupType 4 */
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struct HB_BaseRecord_
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{
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HB_Anchor* BaseAnchor; /* array of base glyph anchor
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tables */
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};
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typedef struct HB_BaseRecord_ HB_BaseRecord;
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struct HB_BaseArray_
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{
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HB_UShort BaseCount; /* number of BaseRecord tables */
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HB_BaseRecord* BaseRecord; /* array of BaseRecord tables */
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};
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typedef struct HB_BaseArray_ HB_BaseArray;
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struct HB_MarkBasePos_
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{
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HB_UShort PosFormat; /* always 1 */
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HB_Coverage MarkCoverage; /* mark glyph coverage table */
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HB_Coverage BaseCoverage; /* base glyph coverage table */
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HB_UShort ClassCount; /* number of mark classes */
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HB_MarkArray MarkArray; /* mark array table */
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HB_BaseArray BaseArray; /* base array table */
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};
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typedef struct HB_MarkBasePos_ HB_MarkBasePos;
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/* LookupType 5 */
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struct HB_ComponentRecord_
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{
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HB_Anchor* LigatureAnchor; /* array of ligature glyph anchor
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tables */
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};
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typedef struct HB_ComponentRecord_ HB_ComponentRecord;
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struct HB_LigatureAttach_
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{
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HB_UShort ComponentCount;
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/* number of ComponentRecord tables */
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HB_ComponentRecord* ComponentRecord;
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/* array of ComponentRecord tables */
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};
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typedef struct HB_LigatureAttach_ HB_LigatureAttach;
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struct HB_LigatureArray_
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{
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HB_UShort LigatureCount; /* number of LigatureAttach tables */
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HB_LigatureAttach* LigatureAttach;
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/* array of LigatureAttach tables */
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};
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typedef struct HB_LigatureArray_ HB_LigatureArray;
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struct HB_MarkLigPos_
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{
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HB_UShort PosFormat; /* always 1 */
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HB_Coverage MarkCoverage; /* mark glyph coverage table */
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HB_Coverage LigatureCoverage;
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/* ligature glyph coverage table */
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HB_UShort ClassCount; /* number of mark classes */
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HB_MarkArray MarkArray; /* mark array table */
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HB_LigatureArray LigatureArray; /* ligature array table */
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};
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typedef struct HB_MarkLigPos_ HB_MarkLigPos;
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/* LookupType 6 */
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struct HB_Mark2Record_
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{
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HB_Anchor* Mark2Anchor; /* array of mark glyph anchor
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tables */
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};
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typedef struct HB_Mark2Record_ HB_Mark2Record;
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struct HB_Mark2Array_
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{
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HB_UShort Mark2Count; /* number of Mark2Record tables */
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HB_Mark2Record* Mark2Record; /* array of Mark2Record tables */
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};
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typedef struct HB_Mark2Array_ HB_Mark2Array;
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struct HB_MarkMarkPos_
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{
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HB_UShort PosFormat; /* always 1 */
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HB_Coverage Mark1Coverage; /* first mark glyph coverage table */
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HB_Coverage Mark2Coverage; /* second mark glyph coverave table */
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HB_UShort ClassCount; /* number of combining mark classes */
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HB_MarkArray Mark1Array; /* MarkArray table for first mark */
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HB_Mark2Array Mark2Array; /* MarkArray table for second mark */
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};
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typedef struct HB_MarkMarkPos_ HB_MarkMarkPos;
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/* needed by both lookup type 7 and 8 */
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struct HB_PosLookupRecord_
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{
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HB_UShort SequenceIndex; /* index into current
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glyph sequence */
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HB_UShort LookupListIndex; /* Lookup to apply to that pos. */
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};
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typedef struct HB_PosLookupRecord_ HB_PosLookupRecord;
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/* LookupType 7 */
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struct HB_PosRule_
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{
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HB_UShort GlyphCount; /* total number of input glyphs */
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HB_UShort PosCount; /* number of PosLookupRecord tables */
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HB_UShort* Input; /* array of input glyph IDs */
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HB_PosLookupRecord* PosLookupRecord;
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/* array of PosLookupRecord tables */
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};
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typedef struct HB_PosRule_ HB_PosRule;
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struct HB_PosRuleSet_
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{
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HB_UShort PosRuleCount; /* number of PosRule tables */
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HB_PosRule* PosRule; /* array of PosRule tables */
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};
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typedef struct HB_PosRuleSet_ HB_PosRuleSet;
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struct HB_ContextPosFormat1_
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{
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HB_Coverage Coverage; /* Coverage table */
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HB_UShort PosRuleSetCount; /* number of PosRuleSet tables */
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HB_PosRuleSet* PosRuleSet; /* array of PosRuleSet tables */
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};
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typedef struct HB_ContextPosFormat1_ HB_ContextPosFormat1;
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struct HB_PosClassRule_
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{
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HB_UShort GlyphCount; /* total number of context classes */
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HB_UShort PosCount; /* number of PosLookupRecord tables */
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HB_UShort* Class; /* array of classes */
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HB_PosLookupRecord* PosLookupRecord;
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/* array of PosLookupRecord tables */
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};
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typedef struct HB_PosClassRule_ HB_PosClassRule;
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struct HB_PosClassSet_
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{
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HB_UShort PosClassRuleCount;
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/* number of PosClassRule tables */
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HB_PosClassRule* PosClassRule; /* array of PosClassRule tables */
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};
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typedef struct HB_PosClassSet_ HB_PosClassSet;
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/* The `MaxContextLength' field is not defined in the TTO specification
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but simplifies the implementation of this format. It holds the
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maximal context length used in the context rules. */
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struct HB_ContextPosFormat2_
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{
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HB_UShort MaxContextLength;
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/* maximal context length */
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HB_Coverage Coverage; /* Coverage table */
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HB_ClassDefinition ClassDef; /* ClassDef table */
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HB_UShort PosClassSetCount;
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/* number of PosClassSet tables */
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HB_PosClassSet* PosClassSet; /* array of PosClassSet tables */
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};
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typedef struct HB_ContextPosFormat2_ HB_ContextPosFormat2;
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struct HB_ContextPosFormat3_
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{
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HB_UShort GlyphCount; /* number of input glyphs */
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HB_UShort PosCount; /* number of PosLookupRecord tables */
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HB_Coverage* Coverage; /* array of Coverage tables */
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HB_PosLookupRecord* PosLookupRecord;
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/* array of PosLookupRecord tables */
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};
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typedef struct HB_ContextPosFormat3_ HB_ContextPosFormat3;
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struct HB_ContextPos_
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{
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HB_UShort PosFormat; /* 1, 2, or 3 */
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union
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{
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HB_ContextPosFormat1 cpf1;
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HB_ContextPosFormat2 cpf2;
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HB_ContextPosFormat3 cpf3;
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} cpf;
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};
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typedef struct HB_ContextPos_ HB_ContextPos;
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/* LookupType 8 */
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struct HB_ChainPosRule_
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{
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HB_UShort BacktrackGlyphCount;
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/* total number of backtrack glyphs */
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HB_UShort* Backtrack; /* array of backtrack glyph IDs */
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HB_UShort InputGlyphCount;
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/* total number of input glyphs */
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HB_UShort* Input; /* array of input glyph IDs */
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HB_UShort LookaheadGlyphCount;
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/* total number of lookahead glyphs */
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HB_UShort* Lookahead; /* array of lookahead glyph IDs */
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HB_UShort PosCount; /* number of PosLookupRecords */
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HB_PosLookupRecord* PosLookupRecord;
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/* array of PosLookupRecords */
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};
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typedef struct HB_ChainPosRule_ HB_ChainPosRule;
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struct HB_ChainPosRuleSet_
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{
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HB_UShort ChainPosRuleCount;
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/* number of ChainPosRule tables */
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HB_ChainPosRule* ChainPosRule; /* array of ChainPosRule tables */
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};
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typedef struct HB_ChainPosRuleSet_ HB_ChainPosRuleSet;
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struct HB_ChainContextPosFormat1_
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{
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HB_Coverage Coverage; /* Coverage table */
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HB_UShort ChainPosRuleSetCount;
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/* number of ChainPosRuleSet tables */
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HB_ChainPosRuleSet* ChainPosRuleSet;
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/* array of ChainPosRuleSet tables */
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};
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typedef struct HB_ChainContextPosFormat1_ HB_ChainContextPosFormat1;
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struct HB_ChainPosClassRule_
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{
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HB_UShort BacktrackGlyphCount;
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/* total number of backtrack
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classes */
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HB_UShort* Backtrack; /* array of backtrack classes */
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HB_UShort InputGlyphCount;
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/* total number of context classes */
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HB_UShort* Input; /* array of context classes */
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HB_UShort LookaheadGlyphCount;
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/* total number of lookahead
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classes */
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HB_UShort* Lookahead; /* array of lookahead classes */
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HB_UShort PosCount; /* number of PosLookupRecords */
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HB_PosLookupRecord* PosLookupRecord;
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/* array of substitution lookups */
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};
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typedef struct HB_ChainPosClassRule_ HB_ChainPosClassRule;
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struct HB_ChainPosClassSet_
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{
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HB_UShort ChainPosClassRuleCount;
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/* number of ChainPosClassRule
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tables */
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HB_ChainPosClassRule* ChainPosClassRule;
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/* array of ChainPosClassRule
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tables */
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};
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typedef struct HB_ChainPosClassSet_ HB_ChainPosClassSet;
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/* The `MaxXXXLength' fields are not defined in the TTO specification
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but simplifies the implementation of this format. It holds the
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maximal context length used in the specific context rules. */
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|
struct HB_ChainContextPosFormat2_
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|
{
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|
HB_Coverage Coverage; /* Coverage table */
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|
HB_UShort MaxBacktrackLength;
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|
/* maximal backtrack length */
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|
HB_ClassDefinition BacktrackClassDef;
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|
/* BacktrackClassDef table */
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|
HB_UShort MaxInputLength;
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|
/* maximal input length */
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|
HB_ClassDefinition InputClassDef;
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|
/* InputClassDef table */
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|
HB_UShort MaxLookaheadLength;
|
|
/* maximal lookahead length */
|
|
HB_ClassDefinition LookaheadClassDef;
|
|
/* LookaheadClassDef table */
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|
|
|
HB_UShort ChainPosClassSetCount;
|
|
/* number of ChainPosClassSet
|
|
tables */
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|
HB_ChainPosClassSet* ChainPosClassSet;
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|
/* array of ChainPosClassSet
|
|
tables */
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|
};
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|
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|
typedef struct HB_ChainContextPosFormat2_ HB_ChainContextPosFormat2;
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|
struct HB_ChainContextPosFormat3_
|
|
{
|
|
HB_UShort BacktrackGlyphCount;
|
|
/* number of backtrack glyphs */
|
|
HB_Coverage* BacktrackCoverage;
|
|
/* array of backtrack Coverage
|
|
tables */
|
|
HB_UShort InputGlyphCount;
|
|
/* number of input glyphs */
|
|
HB_Coverage* InputCoverage;
|
|
/* array of input coverage
|
|
tables */
|
|
HB_UShort LookaheadGlyphCount;
|
|
/* number of lookahead glyphs */
|
|
HB_Coverage* LookaheadCoverage;
|
|
/* array of lookahead coverage
|
|
tables */
|
|
HB_UShort PosCount; /* number of PosLookupRecords */
|
|
HB_PosLookupRecord* PosLookupRecord;
|
|
/* array of substitution lookups */
|
|
};
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|
|
|
typedef struct HB_ChainContextPosFormat3_ HB_ChainContextPosFormat3;
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|
|
|
|
|
struct HB_ChainContextPos_
|
|
{
|
|
HB_UShort PosFormat; /* 1, 2, or 3 */
|
|
|
|
union
|
|
{
|
|
HB_ChainContextPosFormat1 ccpf1;
|
|
HB_ChainContextPosFormat2 ccpf2;
|
|
HB_ChainContextPosFormat3 ccpf3;
|
|
} ccpf;
|
|
};
|
|
|
|
typedef struct HB_ChainContextPos_ HB_ChainContextPos;
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|
|
|
|
|
#if 0
|
|
/* LookupType 10 */
|
|
struct HB_ExtensionPos_
|
|
{
|
|
HB_UShort PosFormat; /* always 1 */
|
|
HB_UShort LookuptType; /* lookup-type of referenced subtable */
|
|
HB_GPOS_SubTable *subtable; /* referenced subtable */
|
|
};
|
|
|
|
typedef struct HB_ExtensionPos_ HB_ExtensionPos;
|
|
#endif
|
|
|
|
|
|
union HB_GPOS_SubTable_
|
|
{
|
|
HB_SinglePos single;
|
|
HB_PairPos pair;
|
|
HB_CursivePos cursive;
|
|
HB_MarkBasePos markbase;
|
|
HB_MarkLigPos marklig;
|
|
HB_MarkMarkPos markmark;
|
|
HB_ContextPos context;
|
|
HB_ChainContextPos chain;
|
|
};
|
|
|
|
typedef union HB_GPOS_SubTable_ HB_GPOS_SubTable;
|
|
|
|
|
|
|
|
HB_INTERNAL HB_Error
|
|
_HB_GPOS_Load_SubTable( HB_GPOS_SubTable* st,
|
|
FT_Stream stream,
|
|
HB_UShort lookup_type );
|
|
|
|
HB_INTERNAL void
|
|
_HB_GPOS_Free_SubTable( HB_GPOS_SubTable* st,
|
|
HB_UShort lookup_type );
|
|
|
|
HB_END_HEADER
|
|
|
|
#endif /* HARFBUZZ_GPOS_PRIVATE_H */
|