ref: 49967cb6101bc7e6593535d1c6fa293c8b26fa4a
dir: /src/truetype/ttgxvar.h/
/****************************************************************************
*
* ttgxvar.h
*
* TrueType GX Font Variation loader (specification)
*
* Copyright (C) 2004-2020 by
* David Turner, Robert Wilhelm, Werner Lemberg and George Williams.
*
* 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 TTGXVAR_H_
#define TTGXVAR_H_
#include <ft2build.h>
#include "ttobjs.h"
FT_BEGIN_HEADER
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
/**************************************************************************
*
* @Struct:
* GX_AVarCorrespondenceRec
*
* @Description:
* A data structure representing `shortFracCorrespondence' in `avar'
* table according to the specifications from Apple.
*/
typedef struct GX_AVarCorrespondenceRec_
{
FT_Fixed fromCoord;
FT_Fixed toCoord;
} GX_AVarCorrespondenceRec_, *GX_AVarCorrespondence;
/**************************************************************************
*
* @Struct:
* GX_AVarRec
*
* @Description:
* Data from the segment field of `avar' table.
* There is one of these for each axis.
*/
typedef struct GX_AVarSegmentRec_
{
FT_UShort pairCount;
GX_AVarCorrespondence correspondence; /* array with pairCount entries */
} GX_AVarSegmentRec, *GX_AVarSegment;
typedef struct GX_ItemVarDataRec_
{
FT_UInt itemCount; /* number of delta sets per item */
FT_UInt regionIdxCount; /* number of region indices in this data */
FT_UInt* regionIndices; /* array of `regionCount' indices; */
/* these index `varRegionList' */
FT_Short* deltaSet; /* array of `itemCount' deltas */
/* use `innerIndex' for this array */
} GX_ItemVarDataRec, *GX_ItemVarData;
/* contribution of one axis to a region */
typedef struct GX_AxisCoordsRec_
{
FT_Fixed startCoord;
FT_Fixed peakCoord; /* zero means no effect (factor = 1) */
FT_Fixed endCoord;
} GX_AxisCoordsRec, *GX_AxisCoords;
typedef struct GX_VarRegionRec_
{
GX_AxisCoords axisList; /* array of axisCount records */
} GX_VarRegionRec, *GX_VarRegion;
/* item variation store */
typedef struct GX_ItemVarStoreRec_
{
FT_UInt dataCount;
GX_ItemVarData varData; /* array of dataCount records; */
/* use `outerIndex' for this array */
FT_UShort axisCount;
FT_UInt regionCount; /* total number of regions defined */
GX_VarRegion varRegionList;
} GX_ItemVarStoreRec, *GX_ItemVarStore;
typedef struct GX_DeltaSetIdxMapRec_
{
FT_UInt mapCount;
FT_UInt* outerIndex; /* indices to item var data */
FT_UInt* innerIndex; /* indices to delta set */
} GX_DeltaSetIdxMapRec, *GX_DeltaSetIdxMap;
/**************************************************************************
*
* @Struct:
* GX_HVVarTableRec
*
* @Description:
* Data from either the `HVAR' or `VVAR' table.
*/
typedef struct GX_HVVarTableRec_
{
GX_ItemVarStoreRec itemStore; /* Item Variation Store */
GX_DeltaSetIdxMapRec widthMap; /* Advance Width Mapping */
#if 0
GX_DeltaSetIdxMapRec lsbMap; /* not implemented */
GX_DeltaSetIdxMapRec rsbMap; /* not implemented */
GX_DeltaSetIdxMapRec tsbMap; /* not implemented */
GX_DeltaSetIdxMapRec bsbMap; /* not implemented */
GX_DeltaSetIdxMapRec vorgMap; /* not implemented */
#endif
} GX_HVVarTableRec, *GX_HVVarTable;
#define MVAR_TAG_GASP_0 FT_MAKE_TAG( 'g', 's', 'p', '0' )
#define MVAR_TAG_GASP_1 FT_MAKE_TAG( 'g', 's', 'p', '1' )
#define MVAR_TAG_GASP_2 FT_MAKE_TAG( 'g', 's', 'p', '2' )
#define MVAR_TAG_GASP_3 FT_MAKE_TAG( 'g', 's', 'p', '3' )
#define MVAR_TAG_GASP_4 FT_MAKE_TAG( 'g', 's', 'p', '4' )
#define MVAR_TAG_GASP_5 FT_MAKE_TAG( 'g', 's', 'p', '5' )
#define MVAR_TAG_GASP_6 FT_MAKE_TAG( 'g', 's', 'p', '6' )
#define MVAR_TAG_GASP_7 FT_MAKE_TAG( 'g', 's', 'p', '7' )
#define MVAR_TAG_GASP_8 FT_MAKE_TAG( 'g', 's', 'p', '8' )
#define MVAR_TAG_GASP_9 FT_MAKE_TAG( 'g', 's', 'p', '9' )
#define MVAR_TAG_CPHT FT_MAKE_TAG( 'c', 'p', 'h', 't' )
#define MVAR_TAG_HASC FT_MAKE_TAG( 'h', 'a', 's', 'c' )
#define MVAR_TAG_HCLA FT_MAKE_TAG( 'h', 'c', 'l', 'a' )
#define MVAR_TAG_HCLD FT_MAKE_TAG( 'h', 'c', 'l', 'd' )
#define MVAR_TAG_HCOF FT_MAKE_TAG( 'h', 'c', 'o', 'f' )
#define MVAR_TAG_HCRN FT_MAKE_TAG( 'h', 'c', 'r', 'n' )
#define MVAR_TAG_HCRS FT_MAKE_TAG( 'h', 'c', 'r', 's' )
#define MVAR_TAG_HDSC FT_MAKE_TAG( 'h', 'd', 's', 'c' )
#define MVAR_TAG_HLGP FT_MAKE_TAG( 'h', 'l', 'g', 'p' )
#define MVAR_TAG_SBXO FT_MAKE_TAG( 's', 'b', 'x', 'o' )
#define MVAR_TAG_SBXS FT_MAKE_TAG( 's', 'b', 'x', 's' )
#define MVAR_TAG_SBYO FT_MAKE_TAG( 's', 'b', 'y', 'o' )
#define MVAR_TAG_SBYS FT_MAKE_TAG( 's', 'b', 'y', 's' )
#define MVAR_TAG_SPXO FT_MAKE_TAG( 's', 'p', 'x', 'o' )
#define MVAR_TAG_SPXS FT_MAKE_TAG( 's', 'p', 'x', 's' )
#define MVAR_TAG_SPYO FT_MAKE_TAG( 's', 'p', 'y', 'o' )
#define MVAR_TAG_SPYS FT_MAKE_TAG( 's', 'p', 'y', 's' )
#define MVAR_TAG_STRO FT_MAKE_TAG( 's', 't', 'r', 'o' )
#define MVAR_TAG_STRS FT_MAKE_TAG( 's', 't', 'r', 's' )
#define MVAR_TAG_UNDO FT_MAKE_TAG( 'u', 'n', 'd', 'o' )
#define MVAR_TAG_UNDS FT_MAKE_TAG( 'u', 'n', 'd', 's' )
#define MVAR_TAG_VASC FT_MAKE_TAG( 'v', 'a', 's', 'c' )
#define MVAR_TAG_VCOF FT_MAKE_TAG( 'v', 'c', 'o', 'f' )
#define MVAR_TAG_VCRN FT_MAKE_TAG( 'v', 'c', 'r', 'n' )
#define MVAR_TAG_VCRS FT_MAKE_TAG( 'v', 'c', 'r', 's' )
#define MVAR_TAG_VDSC FT_MAKE_TAG( 'v', 'd', 's', 'c' )
#define MVAR_TAG_VLGP FT_MAKE_TAG( 'v', 'l', 'g', 'p' )
#define MVAR_TAG_XHGT FT_MAKE_TAG( 'x', 'h', 'g', 't' )
typedef struct GX_ValueRec_
{
FT_ULong tag;
FT_UShort outerIndex;
FT_UShort innerIndex;
FT_Short unmodified; /* values are either FT_Short or FT_UShort */
} GX_ValueRec, *GX_Value;
/**************************************************************************
*
* @Struct:
* GX_MVarTableRec
*
* @Description:
* Data from the `MVAR' table.
*/
typedef struct GX_MVarTableRec_
{
FT_UShort valueCount;
GX_ItemVarStoreRec itemStore; /* Item Variation Store */
GX_Value values; /* Value Records */
} GX_MVarTableRec, *GX_MVarTable;
/**************************************************************************
*
* @Struct:
* GX_BlendRec
*
* @Description:
* Data for interpolating a font from a distortable font specified
* by the GX *var tables ([fgcahvm]var).
*
* @Fields:
* num_axis ::
* The number of axes along which interpolation may happen.
*
* coords ::
* An array of design coordinates (in user space) indicating the
* contribution along each axis to the final interpolated font.
* `normalizedcoords' holds the same values.
*
* normalizedcoords ::
* An array of normalized values (between [-1,1]) indicating the
* contribution along each axis to the final interpolated font.
* `coords' holds the same values.
*
* mmvar ::
* Data from the `fvar' table.
*
* mmvar_len ::
* The length of the `mmvar' structure.
*
* normalized_stylecoords ::
* A two-dimensional array that holds the named instance data from
* `mmvar' as normalized values.
*
* avar_loaded ::
* A Boolean; if set, FreeType tried to load (and parse) the `avar'
* table.
*
* avar_segment ::
* Data from the `avar' table.
*
* hvar_loaded ::
* A Boolean; if set, FreeType tried to load (and parse) the `hvar'
* table.
*
* hvar_checked ::
* A Boolean; if set, FreeType successfully loaded and parsed the
* `hvar' table.
*
* hvar_error ::
* If loading and parsing of the `hvar' table failed, this field
* holds the corresponding error code.
*
* hvar_table ::
* Data from the `hvar' table.
*
* vvar_loaded ::
* A Boolean; if set, FreeType tried to load (and parse) the `vvar'
* table.
*
* vvar_checked ::
* A Boolean; if set, FreeType successfully loaded and parsed the
* `vvar' table.
*
* vvar_error ::
* If loading and parsing of the `vvar' table failed, this field
* holds the corresponding error code.
*
* vvar_table ::
* Data from the `vvar' table.
*
* mvar_table ::
* Data from the `mvar' table.
*
* tuplecount ::
* The number of shared tuples in the `gvar' table.
*
* tuplecoords ::
* A two-dimensional array that holds the shared tuple coordinates
* in the `gvar' table.
*
* gv_glyphcnt ::
* The number of glyphs handled in the `gvar' table.
*
* glyphoffsets ::
* Offsets into the glyph variation data array.
*
* gvar_size ::
* The size of the `gvar' table.
*/
typedef struct GX_BlendRec_
{
FT_UInt num_axis;
FT_Fixed* coords;
FT_Fixed* normalizedcoords;
FT_MM_Var* mmvar;
FT_Offset mmvar_len;
FT_Fixed* normalized_stylecoords;
/* normalized_stylecoords[num_namedstyles][num_axis] */
FT_Bool avar_loaded;
GX_AVarSegment avar_segment; /* avar_segment[num_axis] */
FT_Bool hvar_loaded;
FT_Bool hvar_checked;
FT_Error hvar_error;
GX_HVVarTable hvar_table;
FT_Bool vvar_loaded;
FT_Bool vvar_checked;
FT_Error vvar_error;
GX_HVVarTable vvar_table;
GX_MVarTable mvar_table;
FT_UInt tuplecount;
FT_Fixed* tuplecoords; /* tuplecoords[tuplecount][num_axis] */
FT_UInt gv_glyphcnt;
FT_ULong* glyphoffsets; /* glyphoffsets[gv_glyphcnt + 1] */
FT_ULong gvar_size;
} GX_BlendRec;
/**************************************************************************
*
* @enum:
* GX_TupleCountFlags
*
* @Description:
* Flags used within the `TupleCount' field of the `gvar' table.
*/
typedef enum GX_TupleCountFlags_
{
GX_TC_TUPLES_SHARE_POINT_NUMBERS = 0x8000,
GX_TC_RESERVED_TUPLE_FLAGS = 0x7000,
GX_TC_TUPLE_COUNT_MASK = 0x0FFF
} GX_TupleCountFlags;
/**************************************************************************
*
* @enum:
* GX_TupleIndexFlags
*
* @Description:
* Flags used within the `TupleIndex' field of the `gvar' and `cvar'
* tables.
*/
typedef enum GX_TupleIndexFlags_
{
GX_TI_EMBEDDED_TUPLE_COORD = 0x8000,
GX_TI_INTERMEDIATE_TUPLE = 0x4000,
GX_TI_PRIVATE_POINT_NUMBERS = 0x2000,
GX_TI_RESERVED_TUPLE_FLAG = 0x1000,
GX_TI_TUPLE_INDEX_MASK = 0x0FFF
} GX_TupleIndexFlags;
#define TTAG_wght FT_MAKE_TAG( 'w', 'g', 'h', 't' )
#define TTAG_wdth FT_MAKE_TAG( 'w', 'd', 't', 'h' )
#define TTAG_opsz FT_MAKE_TAG( 'o', 'p', 's', 'z' )
#define TTAG_slnt FT_MAKE_TAG( 's', 'l', 'n', 't' )
FT_LOCAL( FT_Error )
TT_Set_MM_Blend( TT_Face face,
FT_UInt num_coords,
FT_Fixed* coords );
FT_LOCAL( FT_Error )
TT_Get_MM_Blend( TT_Face face,
FT_UInt num_coords,
FT_Fixed* coords );
FT_LOCAL( FT_Error )
TT_Set_Var_Design( TT_Face face,
FT_UInt num_coords,
FT_Fixed* coords );
FT_LOCAL( FT_Error )
TT_Get_MM_Var( TT_Face face,
FT_MM_Var* *master );
FT_LOCAL( FT_Error )
TT_Get_Var_Design( TT_Face face,
FT_UInt num_coords,
FT_Fixed* coords );
FT_LOCAL( FT_Error )
TT_Set_Named_Instance( TT_Face face,
FT_UInt instance_index );
FT_LOCAL( FT_Error )
tt_face_vary_cvt( TT_Face face,
FT_Stream stream );
FT_LOCAL( FT_Error )
TT_Vary_Apply_Glyph_Deltas( TT_Face face,
FT_UInt glyph_index,
FT_Outline* outline,
FT_Vector* unrounded,
FT_UInt n_points );
FT_LOCAL( FT_Error )
tt_hadvance_adjust( TT_Face face,
FT_UInt gindex,
FT_Int *adelta );
FT_LOCAL( FT_Error )
tt_vadvance_adjust( TT_Face face,
FT_UInt gindex,
FT_Int *adelta );
FT_LOCAL( void )
tt_apply_mvar( TT_Face face );
FT_LOCAL( FT_Error )
tt_get_var_blend( TT_Face face,
FT_UInt *num_coords,
FT_Fixed* *coords,
FT_Fixed* *normalizedcoords,
FT_MM_Var* *mm_var );
FT_LOCAL( void )
tt_done_blend( TT_Face face );
#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
FT_END_HEADER
#endif /* TTGXVAR_H_ */
/* END */