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/***************************************************************************/
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/* */
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/* ttgxvar.h */
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/* */
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/* TrueType GX Font Variation loader (specification) */
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/* */
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/* Copyright 2004 by */
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/* David Turner, Robert Wilhelm, Werner Lemberg and George Williams. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#ifndef __TTGXVAR_H__
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#define __TTGXVAR_H__
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#include <ft2build.h>
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#include "ttobjs.h"
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FT_BEGIN_HEADER
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* GX_AVarCorrespondenceRec */
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/* */
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/* <Description> */
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/* A data structure representing `shortFracCorrespondence' in `avar' */
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/* table according to the specifications from Apple. */
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/* */
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typedef struct GX_AVarCorrespondenceRec_
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{
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FT_Fixed fromCoord;
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FT_Fixed toCoord;
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} GX_AVarCorrespondenceRec_, *GX_AVarCorrespondence;
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* GX_AVarRec */
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/* */
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/* <Description> */
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/* Data from the segment field of `avar' table. */
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/* There is one of these for each axis. */
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/* */
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typedef struct GX_AVarSegmentRec_
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{
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FT_UShort pairCount;
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GX_AVarCorrespondence correspondence; /* array with pairCount entries */
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} GX_AVarSegmentRec, *GX_AVarSegment;
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* GX_BlendRec */
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/* */
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/* <Description> */
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/* Data for interpolating a font from a distortable font specified */
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/* by the GX *var tables ([fgca]var). */
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/* */
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/* <Fields> */
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/* num_axis :: The number of axes along which interpolation */
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/* may happen */
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/* */
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/* normalizedcoords :: A normalized value (between [-1,1]) indicating */
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/* the contribution along each axis to the final */
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/* interpolated font. */
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/* */
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typedef struct GX_BlendRec_
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{
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FT_UInt num_axis;
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FT_Fixed* normalizedcoords;
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FT_MM_Var* mmvar;
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FT_Offset mmvar_len;
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FT_Bool avar_checked;
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GX_AVarSegment avar_segment;
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FT_UInt tuplecount; /* shared tuples in `gvar' */
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FT_Fixed* tuplecoords; /* tuplecoords[tuplecount][num_axis] */
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FT_UInt gv_glyphcnt;
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FT_ULong* glyphoffsets;
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} GX_BlendRec;
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/*************************************************************************/
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/* */
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/* <enum> */
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/* GX_TupleCountFlags */
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/* */
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/* <Description> */
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/* Flags used within the `TupleCount' field of the `gvar' table. */
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/* */
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typedef enum GX_TupleCountFlags_
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{
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GX_TC_TUPLES_SHARE_POINT_NUMBERS = 0x8000,
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GX_TC_RESERVED_TUPLE_FLAGS = 0x7000,
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GX_TC_TUPLE_COUNT_MASK = 0x0FFF
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} GX_TupleCountFlags;
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/*************************************************************************/
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/* */
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/* <enum> */
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/* GX_TupleIndexFlags */
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/* */
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/* <Description> */
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/* Flags used within the `TupleIndex' field of the `gvar' and `cvar' */
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/* tables. */
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/* */
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typedef enum GX_TupleIndexFlags_
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{
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GX_TI_EMBEDDED_TUPLE_COORD = 0x8000,
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GX_TI_INTERMEDIATE_TUPLE = 0x4000,
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GX_TI_PRIVATE_POINT_NUMBERS = 0x2000,
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GX_TI_RESERVED_TUPLE_FLAG = 0x1000,
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GX_TI_TUPLE_INDEX_MASK = 0x0FFF
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} GX_TupleIndexFlags;
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#define TTAG_wght FT_MAKE_TAG( 'w', 'g', 'h', 't' )
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#define TTAG_wdth FT_MAKE_TAG( 'w', 'd', 't', 'h' )
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#define TTAG_opsz FT_MAKE_TAG( 'o', 'p', 's', 'z' )
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#define TTAG_slnt FT_MAKE_TAG( 's', 'l', 'n', 't' )
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FT_LOCAL( FT_Error )
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TT_Set_MM_Blend( TT_Face face,
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FT_UInt num_coords,
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FT_Fixed* coords );
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FT_LOCAL( FT_Error )
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TT_Set_Var_Design( TT_Face face,
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FT_UInt num_coords,
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FT_Fixed* coords );
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FT_LOCAL( FT_Error )
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TT_Get_MM_Var( TT_Face face,
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FT_MM_Var* *master );
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FT_LOCAL( FT_Error )
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tt_face_vary_cvt( TT_Face face,
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FT_Stream stream );
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FT_LOCAL( FT_Error )
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TT_Vary_Get_Glyph_Deltas( TT_Face face,
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FT_UInt glyph_index,
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FT_Vector* *deltas,
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FT_UInt n_points );
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FT_LOCAL( void )
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tt_done_blend( FT_Memory memory,
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GX_Blend blend );
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FT_END_HEADER
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#endif /* __TTGXVAR_H__ */
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/* END */
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