thirdparty/freetype-2.3.12/src/truetype/ttgxvar.h

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  ttgxvar.h                                                              */
   4 /*                                                                         */
   5 /*    TrueType GX Font Variation loader (specification)                    */
   6 /*                                                                         */
   7 /*  Copyright 2004 by                                                      */
   8 /*  David Turner, Robert Wilhelm, Werner Lemberg and George Williams.      */
   9 /*                                                                         */
  10 /*  This file is part of the FreeType project, and may only be used,       */
  11 /*  modified, and distributed under the terms of the FreeType project      */
  12 /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
  13 /*  this file you indicate that you have read the license and              */
  14 /*  understand and accept it fully.                                        */
  15 /*                                                                         */
  16 /***************************************************************************/
  17
  18
  19 #ifndef __TTGXVAR_H__
  20 #define __TTGXVAR_H__
  21
  22
  23 #include <ft2build.h>
  24 #include "ttobjs.h"
  25
  26
  27 FT_BEGIN_HEADER
  28
  29
  30   /*************************************************************************/
  31   /*                                                                       */
  32   /* <Struct>                                                              */
  33   /*    GX_AVarCorrespondenceRec                                           */
  34   /*                                                                       */
  35   /* <Description>                                                         */
  36   /*    A data structure representing `shortFracCorrespondence' in `avar'  */
  37   /*    table according to the specifications from Apple.                  */
  38   /*                                                                       */
  39   typedef struct  GX_AVarCorrespondenceRec_
  40   {
  41     FT_Fixed  fromCoord;
  42     FT_Fixed  toCoord;
  43
  44   } GX_AVarCorrespondenceRec_, *GX_AVarCorrespondence;
  45
  46
  47   /*************************************************************************/
  48   /*                                                                       */
  49   /* <Struct>                                                              */
  50   /*    GX_AVarRec                                                         */
  51   /*                                                                       */
  52   /* <Description>                                                         */
  53   /*    Data from the segment field of `avar' table.                       */
  54   /*    There is one of these for each axis.                               */
  55   /*                                                                       */
  56   typedef struct  GX_AVarSegmentRec_
  57   {
  58     FT_UShort              pairCount;
  59     GX_AVarCorrespondence  correspondence; /* array with pairCount entries */
  60
  61   } GX_AVarSegmentRec, *GX_AVarSegment;
  62
  63
  64   /*************************************************************************/
  65   /*                                                                       */
  66   /* <Struct>                                                              */
  67   /*    GX_BlendRec                                                        */
  68   /*                                                                       */
  69   /* <Description>                                                         */
  70   /*    Data for interpolating a font from a distortable font specified    */
  71   /*    by the GX *var tables ([fgca]var).                                 */
  72   /*                                                                       */
  73   /* <Fields>                                                              */
  74   /*    num_axis         :: The number of axes along which interpolation   */
  75   /*                         may happen                                    */
  76   /*                                                                       */
  77   /*    normalizedcoords :: A normalized value (between [-1,1]) indicating */
  78   /*                        the contribution along each axis to the final  */
  79   /*                        interpolated font.                             */
  80   /*                                                                       */
  81   typedef struct  GX_BlendRec_
  82   {
  83     FT_UInt         num_axis;
  84     FT_Fixed*       normalizedcoords;
  85
  86     FT_MM_Var*      mmvar;
  87     FT_Offset       mmvar_len;
  88
  89     FT_Bool         avar_checked;
  90     GX_AVarSegment  avar_segment;
  91
  92     FT_UInt         tuplecount;      /* shared tuples in `gvar'           */
  93     FT_Fixed*       tuplecoords;     /* tuplecoords[tuplecount][num_axis] */
  94
  95     FT_UInt         gv_glyphcnt;
  96     FT_ULong*       glyphoffsets;
  97
  98   } GX_BlendRec;
  99
 100
 101   /*************************************************************************/
 102   /*                                                                       */
 103   /* <enum>                                                                */
 104   /*    GX_TupleCountFlags                                                 */
 105   /*                                                                       */
 106   /* <Description>                                                         */
 107   /*    Flags used within the `TupleCount' field of the `gvar' table.      */
 108   /*                                                                       */
 109   typedef enum  GX_TupleCountFlags_
 110   {
 111     GX_TC_TUPLES_SHARE_POINT_NUMBERS = 0x8000,
 112     GX_TC_RESERVED_TUPLE_FLAGS       = 0x7000,
 113     GX_TC_TUPLE_COUNT_MASK           = 0x0FFF
 114
 115   } GX_TupleCountFlags;
 116
 117
 118   /*************************************************************************/
 119   /*                                                                       */
 120   /* <enum>                                                                */
 121   /*    GX_TupleIndexFlags                                                 */
 122   /*                                                                       */
 123   /* <Description>                                                         */
 124   /*    Flags used within the `TupleIndex' field of the `gvar' and `cvar'  */
 125   /*    tables.                                                            */
 126   /*                                                                       */
 127   typedef enum  GX_TupleIndexFlags_
 128   {
 129     GX_TI_EMBEDDED_TUPLE_COORD  = 0x8000,
 130     GX_TI_INTERMEDIATE_TUPLE    = 0x4000,
 131     GX_TI_PRIVATE_POINT_NUMBERS = 0x2000,
 132     GX_TI_RESERVED_TUPLE_FLAG   = 0x1000,
 133     GX_TI_TUPLE_INDEX_MASK      = 0x0FFF
 134
 135   } GX_TupleIndexFlags;
 136
 137
 138 #define TTAG_wght  FT_MAKE_TAG( 'w', 'g', 'h', 't' )
 139 #define TTAG_wdth  FT_MAKE_TAG( 'w', 'd', 't', 'h' )
 140 #define TTAG_opsz  FT_MAKE_TAG( 'o', 'p', 's', 'z' )
 141 #define TTAG_slnt  FT_MAKE_TAG( 's', 'l', 'n', 't' )
 142
 143
 144   FT_LOCAL( FT_Error )
 145   TT_Set_MM_Blend( TT_Face    face,
 146                    FT_UInt    num_coords,
 147                    FT_Fixed*  coords );
 148
 149   FT_LOCAL( FT_Error )
 150   TT_Set_Var_Design( TT_Face    face,
 151                      FT_UInt    num_coords,
 152                      FT_Fixed*  coords );
 153
 154   FT_LOCAL( FT_Error )
 155   TT_Get_MM_Var( TT_Face      face,
 156                  FT_MM_Var*  *master );
 157
 158
 159   FT_LOCAL( FT_Error )
 160   tt_face_vary_cvt( TT_Face    face,
 161                     FT_Stream  stream );
 162
 163
 164   FT_LOCAL( FT_Error )
 165   TT_Vary_Get_Glyph_Deltas( TT_Face      face,
 166                             FT_UInt      glyph_index,
 167                             FT_Vector*  *deltas,
 168                             FT_UInt      n_points );
 169
 170
 171   FT_LOCAL( void )
 172   tt_done_blend( FT_Memory  memory,
 173                  GX_Blend   blend );
 174
 175
 176 FT_END_HEADER
 177
 178
 179 #endif /* __TTGXVAR_H__ */
 180
 181
 182 /* END */