harfbuzz-gpos-private.h

Pango is a library for layout and rendering of text, with an emphasis on internationalization. Pang

/*
 * Copyright (C) 1998-2004  David Turner and Werner Lemberg
 * Copyright (C) 2006  Behdad Esfahbod
 *
 *  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.
 */

#ifndef HARFBUZZ_GPOS_PRIVATE_H
#define HARFBUZZ_GPOS_PRIVATE_H

#include "harfbuzz-impl.h"
#include "harfbuzz-stream-private.h"
#include "harfbuzz-gpos.h"

HB_BEGIN_HEADER


/* shared tables */

struct  HB_ValueRecord_
{
  HB_Short    XPlacement;             /* horizontal adjustment for
					 placement                      */
  HB_Short    YPlacement;             /* vertical adjustment for
					 placement                      */
  HB_Short    XAdvance;               /* horizontal adjustment for
					 advance                        */
  HB_Short    YAdvance;               /* vertical adjustment for
					 advance                        */
  HB_Device  XPlacementDevice;       /* device table for horizontal
					 placement                      */
  HB_Device  YPlacementDevice;       /* device table for vertical
					 placement                      */
  HB_Device  XAdvanceDevice;         /* device table for horizontal
					 advance                        */
  HB_Device  YAdvanceDevice;         /* device table for vertical
					 advance                        */
  HB_UShort   XIdPlacement;           /* horizontal placement metric ID */
  HB_UShort   YIdPlacement;           /* vertical placement metric ID   */
  HB_UShort   XIdAdvance;             /* horizontal advance metric ID   */
  HB_UShort   YIdAdvance;             /* vertical advance metric ID     */
};

typedef struct HB_ValueRecord_  HB_ValueRecord;


/* Mask values to scan the value format of the ValueRecord structure.
 We always expand compressed ValueRecords of the font.              */

#define HB_GPOS_FORMAT_HAVE_X_PLACEMENT         0x0001
#define HB_GPOS_FORMAT_HAVE_Y_PLACEMENT         0x0002
#define HB_GPOS_FORMAT_HAVE_X_ADVANCE           0x0004
#define HB_GPOS_FORMAT_HAVE_Y_ADVANCE           0x0008
#define HB_GPOS_FORMAT_HAVE_X_PLACEMENT_DEVICE  0x0010
#define HB_GPOS_FORMAT_HAVE_Y_PLACEMENT_DEVICE  0x0020
#define HB_GPOS_FORMAT_HAVE_X_ADVANCE_DEVICE    0x0040
#define HB_GPOS_FORMAT_HAVE_Y_ADVANCE_DEVICE    0x0080
#define HB_GPOS_FORMAT_HAVE_X_ID_PLACEMENT      0x0100
#define HB_GPOS_FORMAT_HAVE_Y_ID_PLACEMENT      0x0200
#define HB_GPOS_FORMAT_HAVE_X_ID_ADVANCE        0x0400
#define HB_GPOS_FORMAT_HAVE_Y_ID_ADVANCE        0x0800


struct  HB_AnchorFormat1_
{
  HB_Short   XCoordinate;             /* horizontal value */
  HB_Short   YCoordinate;             /* vertical value   */
};

typedef struct HB_AnchorFormat1_  HB_AnchorFormat1;


struct  HB_AnchorFormat2_
{
  HB_Short   XCoordinate;             /* horizontal value             */
  HB_Short   YCoordinate;             /* vertical value               */
  HB_UShort  AnchorPoint;             /* index to glyph contour point */
};

typedef struct HB_AnchorFormat2_  HB_AnchorFormat2;


struct  HB_AnchorFormat3_
{
  HB_Short    XCoordinate;            /* horizontal value              */
  HB_Short    YCoordinate;            /* vertical value                */
  HB_Device  XDeviceTable;           /* device table for X coordinate */
  HB_Device  YDeviceTable;           /* device table for Y coordinate */
};

typedef struct HB_AnchorFormat3_  HB_AnchorFormat3;


struct  HB_AnchorFormat4_
{
  HB_UShort  XIdAnchor;               /* horizontal metric ID */
  HB_UShort  YIdAnchor;               /* vertical metric ID   */
};

typedef struct HB_AnchorFormat4_  HB_AnchorFormat4;


struct  HB_Anchor_
{
  HB_UShort  PosFormat;               /* 1, 2, 3, or 4 -- 0 indicates
					 that there is no Anchor table */

  union
  {
    HB_AnchorFormat1  af1;
    HB_AnchorFormat2  af2;
    HB_AnchorFormat3  af3;
    HB_AnchorFormat4  af4;
  } af;
};

typedef struct HB_Anchor_  HB_Anchor;


struct  HB_MarkRecord_
{
  HB_UShort   Class;                  /* mark class   */
  HB_Anchor  MarkAnchor;             /* anchor table */
};

typedef struct HB_MarkRecord_  HB_MarkRecord;


struct  HB_MarkArray_
{
  HB_UShort        MarkCount;         /* number of MarkRecord tables */
  HB_MarkRecord*  MarkRecord;        /* array of MarkRecord tables  */
};

typedef struct HB_MarkArray_  HB_MarkArray;


/* LookupType 1 */

struct  HB_SinglePosFormat1_
{
  HB_ValueRecord  Value;             /* ValueRecord for all covered
					 glyphs                      */
};

typedef struct HB_SinglePosFormat1_  HB_SinglePosFormat1;


struct  HB_SinglePosFormat2_
{
  HB_UShort         ValueCount;       /* number of ValueRecord tables */
  HB_ValueRecord*  Value;            /* array of ValueRecord tables  */
};

typedef struct HB_SinglePosFormat2_  HB_SinglePosFormat2;


struct  HB_SinglePos_
{
  HB_UShort     PosFormat;            /* 1 or 2         */
  HB_Coverage  Coverage;             /* Coverage table */

  HB_UShort     ValueFormat;          /* format of ValueRecord table */

  union
  {
    HB_SinglePosFormat1  spf1;
    HB_SinglePosFormat2  spf2;
  } spf;
};

typedef struct HB_SinglePos_  HB_SinglePos;


/* LookupType 2 */

struct  HB_PairValueRecord_
{
  HB_UShort        SecondGlyph;       /* glyph ID for second glyph  */
  HB_ValueRecord  Value1;            /* pos. data for first glyph  */
  HB_ValueRecord  Value2;            /* pos. data for second glyph */
};

typedef struct HB_PairValueRecord_  HB_PairValueRecord;


struct  HB_PairSet_
{
  HB_UShort             PairValueCount;
				      /* number of PairValueRecord tables */
  HB_PairValueRecord*  PairValueRecord;
				      /* array of PairValueRecord tables  */
};

typedef struct HB_PairSet_  HB_PairSet;


struct  HB_PairPosFormat1_
{
  HB_UShort     PairSetCount;         /* number of PairSet tables    */
  HB_PairSet*  PairSet;              /* array of PairSet tables     */
};

typedef struct HB_PairPosFormat1_  HB_PairPosFormat1;


struct  HB_Class2Record_
{
  HB_ValueRecord  Value1;            /* pos. data for first glyph  */
  HB_ValueRecord  Value2;            /* pos. data for second glyph */
};

typedef struct HB_Class2Record_  HB_Class2Record;


struct  HB_Class1Record_
{
  HB_Class2Record*  Class2Record;    /* array of Class2Record tables */
};

typedef struct HB_Class1Record_  HB_Class1Record;


struct  HB_PairPosFormat2_
{
  HB_ClassDefinition  ClassDef1;     /* class def. for first glyph     */
  HB_ClassDefinition  ClassDef2;     /* class def. for second glyph    */
  HB_UShort            Class1Count;   /* number of classes in ClassDef1
					 table                          */
  HB_UShort            Class2Count;   /* number of classes in ClassDef2
					 table                          */
  HB_Class1Record*    Class1Record;  /* array of Class1Record tables   */
};

typedef struct HB_PairPosFormat2_  HB_PairPosFormat2;


struct  HB_PairPos_
{
  HB_UShort     PosFormat;            /* 1 or 2         */
  HB_Coverage  Coverage;             /* Coverage table */
  HB_UShort     ValueFormat1;         /* format of ValueRecord table
					 for first glyph             */
  HB_UShort     ValueFormat2;         /* format of ValueRecord table
					 for second glyph            */

  union
  {
    HB_PairPosFormat1  ppf1;
    HB_PairPosFormat2  ppf2;
  } ppf;
};

typedef struct HB_PairPos_  HB_PairPos;


/* LookupType 3 */

struct  HB_EntryExitRecord_
{
  HB_Anchor  EntryAnchor;            /* entry Anchor table */
  HB_Anchor  ExitAnchor;             /* exit Anchor table  */
};


typedef struct HB_EntryExitRecord_  HB_EntryExitRecord;

struct  HB_CursivePos_
{
  HB_UShort             PosFormat;    /* always 1                         */
  HB_Coverage          Coverage;     /* Coverage table                   */
  HB_UShort             EntryExitCount;
				      /* number of EntryExitRecord tables */
  HB_EntryExitRecord*  EntryExitRecord;
				      /* array of EntryExitRecord tables  */
};

typedef struct HB_CursivePos_  HB_CursivePos;


/* LookupType 4 */

struct  HB_BaseRecord_
{
  HB_Anchor*  BaseAnchor;            /* array of base glyph anchor
					 tables                     */
};

typedef struct HB_BaseRecord_  HB_BaseRecord;


struct  HB_BaseArray_
{
  HB_UShort        BaseCount;         /* number of BaseRecord tables */
  HB_BaseRecord*  BaseRecord;        /* array of BaseRecord tables  */
};

typedef struct HB_BaseArray_  HB_BaseArray;


struct  HB_MarkBasePos_
{
  HB_UShort      PosFormat;           /* always 1                  */
  HB_Coverage   MarkCoverage;        /* mark glyph coverage table */
  HB_Coverage   BaseCoverage;        /* base glyph coverage table */
  HB_UShort      ClassCount;          /* number of mark classes    */
  HB_MarkArray  MarkArray;           /* mark array table          */
  HB_BaseArray  BaseArray;           /* base array table          */
};

typedef struct HB_MarkBasePos_  HB_MarkBasePos;


/* LookupType 5 */

struct  HB_ComponentRecord_
{
  HB_Anchor*  LigatureAnchor;        /* array of ligature glyph anchor
					 tables                         */
};

typedef struct HB_ComponentRecord_  HB_ComponentRecord;


struct  HB_LigatureAttach_
{
  HB_UShort             ComponentCount;
				      /* number of ComponentRecord tables */
  HB_ComponentRecord*  ComponentRecord;
				      /* array of ComponentRecord tables  */
};

typedef struct HB_LigatureAttach_  HB_LigatureAttach;


struct  HB_LigatureArray_
{
  HB_UShort            LigatureCount; /* number of LigatureAttach tables */
  HB_LigatureAttach*  LigatureAttach;