psaux.h

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/***************************************************************************/
/*                                                                         */
/*  psaux.h                                                                */
/*                                                                         */
/*    Auxiliary functions and data structures related to PostScript fonts  */
/*    (specification).                                                     */
/*                                                                         */
/*  Copyright 1996-2018 by                                                 */
/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
/*                                                                         */
/*  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 PSAUX_H_
#define PSAUX_H_


#include <ft2build.h>
#include FT_INTERNAL_OBJECTS_H
#include FT_INTERNAL_TYPE1_TYPES_H
#include FT_INTERNAL_HASH_H
#include FT_INTERNAL_TRUETYPE_TYPES_H
#include FT_SERVICE_POSTSCRIPT_CMAPS_H
#include FT_INTERNAL_CFF_TYPES_H
#include FT_INTERNAL_CFF_OBJECTS_TYPES_H



FT_BEGIN_HEADER


  /***********************************************************************/
  /*                                                                     */
  /* PostScript modules driver class.                                    */
  /*                                                                     */
  typedef struct  PS_DriverRec_
  {
    FT_DriverRec  root;

    FT_UInt   hinting_engine;
    FT_Bool   no_stem_darkening;
    FT_Int    darken_params[8];
    FT_Int32  random_seed;

  } PS_DriverRec, *PS_Driver;


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                             T1_TABLE                          *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/


  typedef struct PS_TableRec_*              PS_Table;
  typedef const struct PS_Table_FuncsRec_*  PS_Table_Funcs;


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    PS_Table_FuncsRec                                                  */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A set of function pointers to manage PS_Table objects.             */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    table_init    :: Used to initialize a table.                       */
  /*                                                                       */
  /*    table_done    :: Finalizes resp. destroy a given table.            */
  /*                                                                       */
  /*    table_add     :: Adds a new object to a table.                     */
  /*                                                                       */
  /*    table_release :: Releases table data, then finalizes it.           */
  /*                                                                       */
  typedef struct  PS_Table_FuncsRec_
  {
    FT_Error
    (*init)( PS_Table   table,
             FT_Int     count,
             FT_Memory  memory );

    void
    (*done)( PS_Table  table );

    FT_Error
    (*add)( PS_Table  table,
            FT_Int    idx,
            void*     object,
            FT_UInt   length );

    void
    (*release)( PS_Table  table );

  } PS_Table_FuncsRec;


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    PS_TableRec                                                        */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A PS_Table is a simple object used to store an array of objects in */
  /*    a single memory block.                                             */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    block     :: The address in memory of the growheap's block.  This  */
  /*                 can change between two object adds, due to            */
  /*                 reallocation.                                         */
  /*                                                                       */
  /*    cursor    :: The current top of the grow heap within its block.    */
  /*                                                                       */
  /*    capacity  :: The current size of the heap block.  Increments by    */
  /*                 1kByte chunks.                                        */
  /*                                                                       */
  /*    init      :: Set to 0xDEADBEEF if `elements' and `lengths' have    */
  /*                 been allocated.                                       */
  /*                                                                       */
  /*    max_elems :: The maximum number of elements in table.              */
  /*                                                                       */
  /*    num_elems :: The current number of elements in table.              */
  /*                                                                       */
  /*    elements  :: A table of element addresses within the block.        */
  /*                                                                       */
  /*    lengths   :: A table of element sizes within the block.            */
  /*                                                                       */
  /*    memory    :: The object used for memory operations                 */
  /*                 (alloc/realloc).                                      */
  /*                                                                       */
  /*    funcs     :: A table of method pointers for this object.           */
  /*                                                                       */
  typedef struct  PS_TableRec_
  {
    FT_Byte*           block;          /* current memory block           */
    FT_Offset          cursor;         /* current cursor in memory block */
    FT_Offset          capacity;       /* current size of memory block   */
    FT_ULong           init;

    FT_Int             max_elems;
    FT_Int             num_elems;
    FT_Byte**          elements;       /* addresses of table elements */
    FT_UInt*           lengths;        /* lengths of table elements   */

    FT_Memory          memory;
    PS_Table_FuncsRec  funcs;

  } PS_TableRec;


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                       T1 FIELDS & TOKENS                      *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  typedef struct PS_ParserRec_*  PS_Parser;

  typedef struct T1_TokenRec_*   T1_Token;

  typedef struct T1_FieldRec_*   T1_Field;


  /* simple enumeration type used to identify token types */
  typedef enum  T1_TokenType_
  {
    T1_TOKEN_TYPE_NONE = 0,
    T1_TOKEN_TYPE_ANY,
    T1_TOKEN_TYPE_STRING,
    T1_TOKEN_TYPE_ARRAY,
    T1_TOKEN_TYPE_KEY, /* aka `name' */

    /* do not remove */
    T1_TOKEN_TYPE_MAX

  } T1_TokenType;


  /* a simple structure used to identify tokens */
  typedef struct  T1_TokenRec_
  {
    FT_Byte*      start;   /* first character of token in input stream */
    FT_Byte*      limit;   /* first character after the token          */
    T1_TokenType  type;    /* type of token                            */

  } T1_TokenRec;


  /* enumeration type used to identify object fields */
  typedef enum  T1_FieldType_
  {
    T1_FIELD_TYPE_NONE = 0,
    T1_FIELD_TYPE_BOOL,
    T1_FIELD_TYPE_INTEGER,
    T1_FIELD_TYPE_FIXED,
    T1_FIELD_TYPE_FIXED_1000,
    T1_FIELD_TYPE_STRING,
    T1_FIELD_TYPE_KEY,
    T1_FIELD_TYPE_BBOX,
    T1_FIELD_TYPE_MM_BBOX,
    T1_FIELD_TYPE_INTEGER_ARRAY,
    T1_FIELD_TYPE_FIXED_ARRAY,
    T1_FIELD_TYPE_CALLBACK,

    /* do not remove */
    T1_FIELD_TYPE_MAX

  } T1_FieldType;


  typedef enum  T1_FieldLocation_
  {
    T1_FIELD_LOCATION_CID_INFO,
    T1_FIELD_LOCATION_FONT_DICT,
    T1_FIELD_LOCATION_FONT_EXTRA,
    T1_FIELD_LOCATION_FONT_INFO,
    T1_FIELD_LOCATION_PRIVATE,
    T1_FIELD_LOCATION_BBOX,
    T1_FIELD_LOCATION_LOADER,
    T1_FIELD_LOCATION_FACE,
    T1_FIELD_LOCATION_BLEND,

    /* do not remove */
    T1_FIELD_LOCATION_MAX

  } T1_FieldLocation;


  typedef void
  (*T1_Field_ParseFunc)( FT_Face     face,
                         FT_Pointer  parser );


  /* structure type used to model object fields */
  typedef struct  T1_FieldRec_
  {
    const char*         ident;        /* field identifier               */
    T1_FieldLocation    location;
    T1_FieldType        type;         /* type of field                  */
    T1_Field_ParseFunc  reader;
    FT_UInt             offset;       /* offset of field in object      */
    FT_Byte             size;         /* size of field in bytes         */
    FT_UInt             array_max;    /* maximum number of elements for */
                                      /* array                          */
    FT_UInt             count_offset; /* offset of element count for    */
                                      /* arrays; must not be zero if in */
                                      /* use -- in other words, a       */
                                      /* `num_FOO' element must not     */
                                      /* start the used structure if we */
                                      /* parse a `FOO' array            */
    FT_UInt             dict;         /* where we expect it             */
  } T1_FieldRec;

#define T1_FIELD_DICT_FONTDICT ( 1 << 0 ) /* also FontInfo and FDArray */
#define T1_FIELD_DICT_PRIVATE  ( 1 << 1 )



#define T1_NEW_SIMPLE_FIELD( _ident, _type, _fname, _dict ) \
          {                                                 \
            _ident, T1CODE, _type,                          \
            0,                                              \
            FT_FIELD_OFFSET( _fname ),                      \
            FT_FIELD_SIZE( _fname ),                        \
            0, 0,                                           \
            _dict                                           \
          },

#define T1_NEW_CALLBACK_FIELD( _ident, _reader, _dict ) \
          {                                             \
            _ident, T1CODE, T1_FIELD_TYPE_CALLBACK,     \
            (T1_Field_ParseFunc)_reader,                \
            0, 0,                                       \
            0, 0,                                       \
            _dict                                       \
          },

#define T1_NEW_TABLE_FIELD( _ident, _type, _fname, _max, _dict ) \
          {                                                      \
            _ident, T1CODE, _type,                               \
            0,                                                   \
            FT_FIELD_OFFSET( _fname ),                           \
            FT_FIELD_SIZE_DELTA( _fname ),                       \
            _max,                                                \
            FT_FIELD_OFFSET( num_ ## _fname ),                   \
            _dict                                                \
          },

#define T1_NEW_TABLE_FIELD2( _ident, _type, _fname, _max, _dict ) \
          {                                                       \
            _ident, T1CODE, _type,                                \
            0,                                                    \
            FT_FIELD_OFFSET( _fname ),                            \
            FT_FIELD_SIZE_DELTA( _fname ),                        \
            _max, 0,                                              \
            _dict                                                 \
          },


#define T1_FIELD_BOOL( _ident, _fname, _dict )                             \
          T1_NEW_SIMPLE_FIELD( _ident, T1_FIELD_TYPE_BOOL, _fname, _dict )

#define T1_FIELD_NUM( _ident, _fname, _dict )                                 \
          T1_NEW_SIMPLE_FIELD( _ident, T1_FIELD_TYPE_INTEGER, _fname, _dict )

#define T1_FIELD_FIXED( _ident, _fname, _dict )                             \
          T1_NEW_SIMPLE_FIELD( _ident, T1_FIELD_TYPE_FIXED, _fname, _dict )

#define T1_FIELD_FIXED_1000( _ident, _fname, _dict )                     \
          T1_NEW_SIMPLE_FIELD( _ident, T1_FIELD_TYPE_FIXED_1000, _fname, \
                               _dict )

#define T1_FIELD_STRING( _ident, _fname, _dict )                             \
          T1_NEW_SIMPLE_FIELD( _ident, T1_FIELD_TYPE_STRING, _fname, _dict )

#define T1_FIELD_KEY( _ident, _fname, _dict )                             \
          T1_NEW_SIMPLE_FIELD( _ident, T1_FIELD_TYPE_KEY, _fname, _dict )

#define T1_FIELD_BBOX( _ident, _fname, _dict )                             \
          T1_NEW_SIMPLE_FIELD( _ident, T1_FIELD_TYPE_BBOX, _fname, _dict )


#define T1_FIELD_NUM_TABLE( _ident, _fname, _fmax, _dict )         \
          T1_NEW_TABLE_FIELD( _ident, T1_FIELD_TYPE_INTEGER_ARRAY, \
                              _fname, _fmax, _dict )

#define T1_FIELD_FIXED_TABLE( _ident, _fname, _fmax, _dict )     \
          T1_NEW_TABLE_FIELD( _ident, T1_FIELD_TYPE_FIXED_ARRAY, \
                              _fname, _fmax, _dict )

#define T1_FIELD_NUM_TABLE2( _ident, _fname, _fmax, _dict )         \
          T1_NEW_TABLE_FIELD2( _ident, T1_FIELD_TYPE_INTEGER_ARRAY, \
                               _fname, _fmax, _dict )

#define T1_FIELD_FIXED_TABLE2( _ident, _fname, _fmax, _dict )     \
          T1_NEW_TABLE_FIELD2( _ident, T1_FIELD_TYPE_FIXED_ARRAY, \
                               _fname, _fmax, _dict )

#define T1_FIELD_CALLBACK( _ident, _name, _dict )       \
          T1_NEW_CALLBACK_FIELD( _ident, _name, _dict )


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                            T1 PARSER                          *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  typedef const struct PS_Parser_FuncsRec_*  PS_Parser_Funcs;

  typedef struct  PS_Parser_FuncsRec_
  {
    void
    (*init)( PS_Parser  parser,
             FT_Byte*   base,
             FT_Byte*   limit,
             FT_Memory  memory );

    void
    (*done)( PS_Parser  parser );

    void
    (*skip_spaces)( PS_Parser  parser );
    void
    (*skip_PS_token)( PS_Parser  parser );

    FT_Long
    (*to_int)( PS_Parser  parser );
    FT_Fixed
    (*to_fixed)( PS_Parser  parser,
                 FT_Int     power_ten );

    FT_Error
    (*to_bytes)( PS_Parser  parser,
                 FT_Byte*   bytes,
                 FT_Offset  max_bytes,
                 FT_ULong*  pnum_bytes,
                 FT_Bool    delimiters );

    FT_Int
    (*to_coord_array)( PS_Parser  parser,
                       FT_Int     max_coords,
                       FT_Short*  coords );
    FT_Int
    (*to_fixed_array)( PS_Parser  parser,
                       FT_Int     max_values,
                       FT_Fixed*  values,
                       FT_Int     power_ten );

    void
    (*to_token)( PS_Parser  parser,
                 T1_Token   token );
    void
    (*to_token_array)( PS_Parser  parser,
                       T1_Token   tokens,
                       FT_UInt    max_tokens,
                       FT_Int*    pnum_tokens );

    FT_Error
    (*load_field)( PS_Parser       parser,
                   const T1_Field  field,
                   void**          objects,
                   FT_UInt         max_objects,
                   FT_ULong*       pflags );

    FT_Error
    (*load_field_table)( PS_Parser       parser,
                         const T1_Field  field,
                         void**          objects,
                         FT_UInt         max_objects,
                         FT_ULong*       pflags );

  } PS_Parser_FuncsRec;


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    PS_ParserRec                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A PS_Parser is an object used to parse a Type 1 font very quickly. */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    cursor :: The current position in the text.                        */
  /*                                                                       */
  /*    base   :: Start of the processed text.                             */
  /*                                                                       */
  /*    limit  :: End of the processed text.                               */
  /*                                                                       */
  /*    error  :: The last error returned.                                 */
  /*                                                                       */
  /*    memory :: The object used for memory operations (alloc/realloc).   */
  /*                                                                       */
  /*    funcs  :: A table of functions for the parser.                     */
  /*                                                                       */
  typedef struct  PS_ParserRec_
  {
    FT_Byte*   cursor;
    FT_Byte*   base;
    FT_Byte*   limit;
    FT_Error   error;
    FT_Memory  memory;

    PS_Parser_FuncsRec  funcs;

  } PS_ParserRec;


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                         PS BUILDER                            *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/


  typedef struct PS_Builder_  PS_Builder;
  typedef const struct PS_Builder_FuncsRec_*  PS_Builder_Funcs;

  typedef struct  PS_Builder_FuncsRec_
  {
    void
    (*init)( PS_Builder*  ps_builder,
             void*        builder,
             FT_Bool      is_t1 );

    void
    (*done)( PS_Builder*  builder );

  } PS_Builder_FuncsRec;


  /*************************************************************************/
  /*                                                                       */
  /* <Structure>                                                           */
  /*    PS_Builder                                                         */
  /*                                                                       */
  /* <Description>                                                         */
  /*     A structure used during glyph loading to store its outline.       */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    memory       :: The current memory object.                         */
  /*                                                                       */
  /*    face         :: The current face object.                           */
  /*                                                                       */
  /*    glyph        :: The current glyph slot.                            */
  /*                                                                       */
  /*    loader       :: XXX                                                */
  /*                                                                       */
  /*    base         :: The base glyph outline.                            */
  /*                                                                       */
  /*    current      :: The current glyph outline.                         */
  /*                                                                       */
  /*    pos_x        :: The horizontal translation (if composite glyph).   */
  /*                                                                       */
  /*    pos_y        :: The vertical translation (if composite glyph).     */
  /*                                                                       */
  /*    left_bearing :: The left side bearing point.                       */
  /*                                                                       */
  /*    advance      :: The horizontal advance vector.                     */
  /*                                                                       */
  /*    bbox         :: Unused.                                            */
  /*                                                                       */
  /*    path_begun   :: A flag which indicates that a new path has begun.  */
  /*                                                                       */
  /*    load_points  :: If this flag is not set, no points are loaded.     */
  /*                                                                       */
  /*    no_recurse   :: Set but not used.                                  */
  /*                                                                       */
  /*    metrics_only :: A boolean indicating that we only want to compute  */
  /*                    the metrics of a given glyph, not load all of its  */
  /*                    points.                                            */
  /*                                                                       */
  /*    is_t1        :: Set if current font type is Type 1.                */
  /*                                                                       */
  /*    funcs        :: An array of function pointers for the builder.     */
  /*                                                                       */
  struct  PS_Builder_
  {
    FT_Memory       memory;
    FT_Face         face;
    CFF_GlyphSlot   glyph;
    FT_GlyphLoader  loader;
    FT_Outline*     base;
    FT_Outline*     current;

    FT_Pos*  pos_x;
    FT_Pos*  pos_y;

    FT_Vector*  left_bearing;
    FT_Vector*  advance;

    FT_BBox*  bbox;          /* bounding box */
    FT_Bool   path_begun;
    FT_Bool   load_points;
    FT_Bool   no_recurse;

    FT_Bool  metrics_only;
    FT_Bool  is_t1;

    PS_Builder_FuncsRec  funcs;

  };


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                            PS DECODER                         *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

#define PS_MAX_OPERANDS        48
#define PS_MAX_SUBRS_CALLS     16   /* maximum subroutine nesting;         */
                                    /* only 10 are allowed but there exist */
                                    /* fonts like `HiraKakuProN-W3.ttf'    */
                                    /* (Hiragino Kaku Gothic ProN W3;      */
                                    /* 8.2d6e1; 2014-12-19) that exceed    */
                                    /* this limit                          */

  /* execution context charstring zone */

  typedef struct  PS_Decoder_Zone_
  {
    FT_Byte*  base;
    FT_Byte*  limit;
    FT_Byte*  cursor;

  } PS_Decoder_Zone;


  typedef FT_Error
  (*CFF_Decoder_Get_Glyph_Callback)( TT_Face    face,
                                     FT_UInt    glyph_index,
                                     FT_Byte**  pointer,
                                     FT_ULong*  length );

  typedef void
  (*CFF_Decoder_Free_Glyph_Callback)( TT_Face    face,
                                      FT_Byte**  pointer,
                                      FT_ULong   length );


  typedef struct  PS_Decoder_
  {
    PS_Builder  builder;

    FT_Fixed   stack[PS_MAX_OPERANDS + 1];
    FT_Fixed*  top;

    PS_Decoder_Zone   zones[PS_MAX_SUBRS_CALLS + 1];
    PS_Decoder_Zone*  zone;

    FT_Int     flex_state;
    FT_Int     num_flex_vectors;
    FT_Vector  flex_vectors[7];

    CFF_Font     cff;
    CFF_SubFont  current_subfont; /* for current glyph_index */
    FT_Generic*  cf2_instance;

    FT_Pos*  glyph_width;
    FT_Bool  width_only;
    FT_Int   num_hints;

    FT_UInt  num_locals;
    FT_UInt  num_globals;

    FT_Int  locals_bias;
    FT_Int  globals_bias;

    FT_Byte**  locals;
    FT_Byte**  globals;

    FT_Byte**  glyph_names;   /* for pure CFF fonts only  */
    FT_UInt    num_glyphs;    /* number of glyphs in font */

    FT_Render_Mode  hint_mode;

    FT_Bool  seac;

    CFF_Decoder_Get_Glyph_Callback   get_glyph_callback;
    CFF_Decoder_Free_Glyph_Callback  free_glyph_callback;

    /* Type 1 stuff */
    FT_Service_PsCMaps  psnames;      /* for seac */

    FT_Int    lenIV;         /* internal for sub routine calls   */
    FT_UInt*  locals_len;    /* array of subrs length (optional) */
    FT_Hash   locals_hash;   /* used if `num_subrs' was massaged */

    FT_Matrix  font_matrix;
    FT_Vector  font_offset;

    PS_Blend  blend;         /* for multiple master support */

    FT_Long*  buildchar;
    FT_UInt   len_buildchar;

  } PS_Decoder;


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                         T1 BUILDER                            *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/


  typedef struct T1_BuilderRec_*  T1_Builder;


  typedef FT_Error
  (*T1_Builder_Check_Points_Func)( T1_Builder  builder,
                                   FT_Int      count );

  typedef void
  (*T1_Builder_Add_Point_Func)( T1_Builder  builder,
                                FT_Pos      x,
                                FT_Pos      y,
                                FT_Byte     flag );

  typedef FT_Error
  (*T1_Builder_Add_Point1_Func)( T1_Builder  builder,
                                 FT_Pos      x,
                                 FT_Pos      y );

  typedef FT_Error
  (*T1_Builder_Add_Contour_Func)( T1_Builder  builder );

  typedef FT_Error
  (*T1_Builder_Start_Point_Func)( T1_Builder  builder,
                                  FT_Pos      x,
                                  FT_Pos      y );

  typedef void
  (*T1_Builder_Close_Contour_Func)( T1_Builder  builder );


  typedef const struct T1_Builder_FuncsRec_*  T1_Builder_Funcs;

  typedef struct  T1_Builder_FuncsRec_
  {
    void
    (*init)( T1_Builder    builder,
             FT_Face       face,
             FT_Size       size,
             FT_GlyphSlot  slot,
             FT_Bool       hinting );

    void
    (*done)( T1_Builder   builder );

    T1_Builder_Check_Points_Func   check_points;
    T1_Builder_Add_Point_Func      add_point;
    T1_Builder_Add_Point1_Func     add_point1;
    T1_Builder_Add_Contour_Func    add_contour;
    T1_Builder_Start_Point_Func    start_point;
    T1_Builder_Close_Contour_Func  close_contour;

  } T1_Builder_FuncsRec;


  /* an enumeration type to handle charstring parsing states */
  typedef enum  T1_ParseState_
  {
    T1_Parse_Start,
    T1_Parse_Have_Width,
    T1_Parse_Have_Moveto,
    T1_Parse_Have_Path

  } T1_ParseState;


  /*************************************************************************/
  /*                                                                       */
  /* <Structure>                                                           */
  /*    T1_BuilderRec                                                      */
  /*                                                                       */
  /* <Description>                                                         */
  /*     A structure used during glyph loading to store its outline.       */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    memory       :: The current memory object.                         */
  /*                                                                       */
  /*    face         :: The current face object.                           */
  /*                                                                       */
  /*    glyph        :: The current glyph slot.                            */
  /*                                                                       */
  /*    loader       :: XXX                                                */
  /*                                                                       */
  /*    base         :: The base glyph outline.                            */
  /*                                                                       */
  /*    current      :: The current glyph outline.                         */
  /*                                                                       */
  /*    max_points   :: maximum points in builder outline                  */
  /*                                                                       */
  /*    max_contours :: Maximum number of contours in builder outline.     */
  /*                                                                       */
  /*    pos_x        :: The horizontal translation (if composite glyph).   */
  /*                                                                       */
  /*    pos_y        :: The vertical translation (if composite glyph).     */
  /*                                                                       */
  /*    left_bearing :: The left side bearing point.                       */
  /*                                                                       */
  /*    advance      :: The horizontal advance vector.                     */
  /*                                                                       */
  /*    bbox         :: Unused.                                            */
  /*                                                                       */
  /*    parse_state  :: An enumeration which controls the charstring       */
  /*                    parsing state.                                     */
  /*                                                                       */
  /*    load_points  :: If this flag is not set, no points are loaded.     */
  /*                                                                       */
  /*    no_recurse   :: Set but not used.                                  */
  /*                                                                       */
  /*    metrics_only :: A boolean indicating that we only want to compute  */
  /*                    the metrics of a given glyph, not load all of its  */
  /*                    points.                                            */
  /*                                                                       */
  /*    funcs        :: An array of function pointers for the builder.     */
  /*                                                                       */
  typedef struct  T1_BuilderRec_
  {
    FT_Memory       memory;
    FT_Face         face;
    FT_GlyphSlot    glyph;
    FT_GlyphLoader  loader;
    FT_Outline*     base;
    FT_Outline*     current;

    FT_Pos          pos_x;
    FT_Pos          pos_y;

    FT_Vector       left_bearing;
    FT_Vector       advance;

    FT_BBox         bbox;          /* bounding box */
    T1_ParseState   parse_state;
    FT_Bool         load_points;
    FT_Bool         no_recurse;

    FT_Bool         metrics_only;

    void*           hints_funcs;    /* hinter-specific */
    void*           hints_globals;  /* hinter-specific */

    T1_Builder_FuncsRec  funcs;

  } T1_BuilderRec;


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                         T1 DECODER                            *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

#if 0

  /*************************************************************************/
  /*                                                                       */
  /* T1_MAX_SUBRS_CALLS details the maximum number of nested sub-routine   */
  /* calls during glyph loading.                                           */
  /*                                                                       */
#define T1_MAX_SUBRS_CALLS  8


  /*************************************************************************/
  /*                                                                       */
  /* T1_MAX_CHARSTRING_OPERANDS is the charstring stack's capacity.  A     */
  /* minimum of 16 is required.                                            */
  /*                                                                       */
#define T1_MAX_CHARSTRINGS_OPERANDS  32

#endif /* 0 */


  typedef struct  T1_Decoder_ZoneRec_
  {
    FT_Byte*  cursor;
    FT_Byte*  base;
    FT_Byte*  limit;

  } T1_Decoder_ZoneRec, *T1_Decoder_Zone;


  typedef struct T1_DecoderRec_*              T1_Decoder;
  typedef const struct T1_Decoder_FuncsRec_*  T1_Decoder_Funcs;


  typedef FT_Error
  (*T1_Decoder_Callback)( T1_Decoder  decoder,
                          FT_UInt     glyph_index );


  typedef struct  T1_Decoder_FuncsRec_
  {
    FT_Error
    (*init)( T1_Decoder           decoder,
             FT_Face              face,
             FT_Size              size,
             FT_GlyphSlot         slot,
             FT_Byte**            glyph_names,
             PS_Blend             blend,
             FT_Bool              hinting,
             FT_Render_Mode       hint_mode,
             T1_Decoder_Callback  callback );

    void
    (*done)( T1_Decoder  decoder );

#ifdef T1_CONFIG_OPTION_OLD_ENGINE
    FT_Error
    (*parse_charstrings_old)( T1_Decoder  decoder,
                              FT_Byte*    base,
                              FT_UInt     len );
#else
    FT_Error
    (*parse_metrics)( T1_Decoder  decoder,
                      FT_Byte*    base,
                      FT_UInt     len );
#endif

    FT_Error
    (*parse_charstrings)( PS_Decoder*  decoder,
                          FT_Byte*     charstring_base,
                          FT_ULong     charstring_len );


  } T1_Decoder_FuncsRec;


  typedef struct  T1_DecoderRec_
  {
    T1_BuilderRec        builder;

    FT_Long              stack[T1_MAX_CHARSTRINGS_OPERANDS];
    FT_Long*             top;

    T1_Decoder_ZoneRec   zones[T1_MAX_SUBRS_CALLS + 1];
    T1_Decoder_Zone      zone;

    FT_Service_PsCMaps   psnames;      /* for seac */
    FT_UInt              num_glyphs;
    FT_Byte**            glyph_names;

    FT_Int               lenIV;        /* internal for sub routine calls */
    FT_Int               num_subrs;
    FT_Byte**            subrs;
    FT_UInt*             subrs_len;    /* array of subrs length (optional) */
    FT_Hash              subrs_hash;   /* used if `num_subrs' was massaged */

    FT_Matrix            font_matrix;
    FT_Vector            font_offset;

    FT_Int               flex_state;
    FT_Int               num_flex_vectors;
    FT_Vector            flex_vectors[7];

    PS_Blend             blend;       /* for multiple master support */

    FT_Render_Mode       hint_mode;

    T1_Decoder_Callback  parse_callback;
    T1_Decoder_FuncsRec  funcs;

    FT_Long*             buildchar;
    FT_UInt              len_buildchar;

    FT_Bool              seac;

    FT_Generic           cf2_instance;

  } T1_DecoderRec;


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                        CFF BUILDER                            *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/


  typedef struct CFF_Builder_  CFF_Builder;


  typedef FT_Error
  (*CFF_Builder_Check_Points_Func)( CFF_Builder*  builder,
                                    FT_Int        count );

  typedef void
  (*CFF_Builder_Add_Point_Func)( CFF_Builder*  builder,
                                 FT_Pos        x,
                                 FT_Pos        y,
                                 FT_Byte       flag );
  typedef FT_Error
  (*CFF_Builder_Add_Point1_Func)( CFF_Builder*  builder,
                                  FT_Pos        x,
                                  FT_Pos        y );
  typedef FT_Error
  (*CFF_Builder_Start_Point_Func)( CFF_Builder*  builder,
                                   FT_Pos        x,
                                   FT_Pos        y );
  typedef void
  (*CFF_Builder_Close_Contour_Func)( CFF_Builder*  builder );

  typedef FT_Error
  (*CFF_Builder_Add_Contour_Func)( CFF_Builder*  builder );

  typedef const struct CFF_Builder_FuncsRec_*  CFF_Builder_Funcs;

  typedef struct  CFF_Builder_FuncsRec_
  {
    void
    (*init)( CFF_Builder*   builder,
             TT_Face        face,
             CFF_Size       size,
             CFF_GlyphSlot  glyph,
             FT_Bool        hinting );

    void
    (*done)( CFF_Builder*  builder );

    CFF_Builder_Check_Points_Func   check_points;
    CFF_Builder_Add_Point_Func      add_point;
    CFF_Builder_Add_Point1_Func     add_point1;
    CFF_Builder_Add_Contour_Func    add_contour;
    CFF_Builder_Start_Point_Func    start_point;
    CFF_Builder_Close_Contour_Func  close_contour;

  } CFF_Builder_FuncsRec;


  /*************************************************************************/
  /*                                                                       */
  /* <Structure>                                                           */
  /*    CFF_Builder                                                        */
  /*                                                                       */
  /* <Description>                                                         */
  /*     A structure used during glyph loading to store its outline.       */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    memory        :: The current memory object.                        */
  /*                                                                       */
  /*    face          :: The current face object.                          */
  /*                                                                       */
  /*    glyph         :: The current glyph slot.                           */
  /*                                                                       */
  /*    loader        :: The current glyph loader.                         */
  /*                                                                       */
  /*    base          :: The base glyph outline.                           */
  /*                                                                       */
  /*    current       :: The current glyph outline.                        */
  /*                                                                       */
  /*    pos_x         :: The horizontal translation (if composite glyph).  */
  /*                                                                       */
  /*    pos_y         :: The vertical translation (if composite glyph).    */
  /*                                                                       */
  /*    left_bearing  :: The left side bearing point.                      */
  /*                                                                       */
  /*    advance       :: The horizontal advance vector.                    */
  /*                                                                       */
  /*    bbox          :: Unused.                                           */
  /*                                                                       */
  /*    path_begun    :: A flag which indicates that a new path has begun. */
  /*                                                                       */
  /*    load_points   :: If this flag is not set, no points are loaded.    */
  /*                                                                       */
  /*    no_recurse    :: Set but not used.                                 */
  /*                                                                       */
  /*    metrics_only  :: A boolean indicating that we only want to compute */
  /*                     the metrics of a given glyph, not load all of its */
  /*                     points.                                           */
  /*                                                                       */
  /*    hints_funcs   :: Auxiliary pointer for hinting.                    */
  /*                                                                       */
  /*    hints_globals :: Auxiliary pointer for hinting.                    */
  /*                                                                       */
  /*    funcs         :: A table of method pointers for this object.       */
  /*                                                                       */
  struct  CFF_Builder_
  {
    FT_Memory       memory;
    TT_Face         face;
    CFF_GlyphSlot   glyph;
    FT_GlyphLoader  loader;
    FT_Outline*     base;
    FT_Outline*     current;

    FT_Pos  pos_x;
    FT_Pos  pos_y;

    FT_Vector  left_bearing;
    FT_Vector  advance;

    FT_BBox  bbox;          /* bounding box */

    FT_Bool  path_begun;
    FT_Bool  load_points;
    FT_Bool  no_recurse;

    FT_Bool  metrics_only;

    void*  hints_funcs;     /* hinter-specific */
    void*  hints_globals;   /* hinter-specific */

    CFF_Builder_FuncsRec  funcs;
  };


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                        CFF DECODER                            *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/


#define CFF_MAX_OPERANDS        48
#define CFF_MAX_SUBRS_CALLS     16  /* maximum subroutine nesting;         */
                                    /* only 10 are allowed but there exist */
                                    /* fonts like `HiraKakuProN-W3.ttf'    */
                                    /* (Hiragino Kaku Gothic ProN W3;      */
                                    /* 8.2d6e1; 2014-12-19) that exceed    */
                                    /* this limit                          */
#define CFF_MAX_TRANS_ELEMENTS  32

  /* execution context charstring zone */

  typedef struct  CFF_Decoder_Zone_
  {
    FT_Byte*  base;
    FT_Byte*  limit;
    FT_Byte*  cursor;

  } CFF_Decoder_Zone;


  typedef struct  CFF_Decoder_
  {
    CFF_Builder  builder;
    CFF_Font     cff;

    FT_Fixed   stack[CFF_MAX_OPERANDS + 1];
    FT_Fixed*  top;

    CFF_Decoder_Zone   zones[CFF_MAX_SUBRS_CALLS + 1];
    CFF_Decoder_Zone*  zone;

    FT_Int     flex_state;
    FT_Int     num_flex_vectors;
    FT_Vector  flex_vectors[7];

    FT_Pos  glyph_width;
    FT_Pos  nominal_width;

    FT_Bool   read_width;
    FT_Bool   width_only;
    FT_Int    num_hints;
    FT_Fixed  buildchar[CFF_MAX_TRANS_ELEMENTS];

    FT_UInt  num_locals;
    FT_UInt  num_globals;

    FT_Int  locals_bias;
    FT_Int  globals_bias;

    FT_Byte**  locals;
    FT_Byte**  globals;

    FT_Byte**  glyph_names;   /* for pure CFF fonts only  */
    FT_UInt    num_glyphs;    /* number of glyphs in font */

    FT_Render_Mode  hint_mode;

    FT_Bool  seac;

    CFF_SubFont  current_subfont; /* for current glyph_index */

    CFF_Decoder_Get_Glyph_Callback   get_glyph_callback;
    CFF_Decoder_Free_Glyph_Callback  free_glyph_callback;

  } CFF_Decoder;


  typedef const struct CFF_Decoder_FuncsRec_*  CFF_Decoder_Funcs;

  typedef struct  CFF_Decoder_FuncsRec_
  {
    void
    (*init)( CFF_Decoder*                     decoder,
             TT_Face                          face,
             CFF_Size                         size,
             CFF_GlyphSlot                    slot,
             FT_Bool                          hinting,
             FT_Render_Mode                   hint_mode,
             CFF_Decoder_Get_Glyph_Callback   get_callback,
             CFF_Decoder_Free_Glyph_Callback  free_callback );

    FT_Error
    (*prepare)( CFF_Decoder*  decoder,
                CFF_Size      size,
                FT_UInt       glyph_index );

#ifdef CFF_CONFIG_OPTION_OLD_ENGINE
    FT_Error
    (*parse_charstrings_old)( CFF_Decoder*  decoder,
                              FT_Byte*      charstring_base,
                              FT_ULong      charstring_len,
                              FT_Bool       in_dict );
#endif

    FT_Error
    (*parse_charstrings)( PS_Decoder*  decoder,
                          FT_Byte*     charstring_base,
                          FT_ULong     charstring_len );

  } CFF_Decoder_FuncsRec;


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                            AFM PARSER                         *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  typedef struct AFM_ParserRec_*  AFM_Parser;

  typedef struct  AFM_Parser_FuncsRec_
  {
    FT_Error
    (*init)( AFM_Parser  parser,
             FT_Memory   memory,
             FT_Byte*    base,
             FT_Byte*    limit );

    void
    (*done)( AFM_Parser  parser );

    FT_Error
    (*parse)( AFM_Parser  parser );

  } AFM_Parser_FuncsRec;


  typedef struct AFM_StreamRec_*  AFM_Stream;


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    AFM_ParserRec                                                      */
  /*                                                                       */
  /* <Description>                                                         */
  /*    An AFM_Parser is a parser for the AFM files.                       */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    memory    :: The object used for memory operations (alloc and      */
  /*                 realloc).                                             */
  /*                                                                       */
  /*    stream    :: This is an opaque object.                             */
  /*                                                                       */
  /*    FontInfo  :: The result will be stored here.                       */
  /*                                                                       */
  /*    get_index :: A user provided function to get a glyph index by its  */
  /*                 name.                                                 */
  /*                                                                       */
  typedef struct  AFM_ParserRec_
  {
    FT_Memory     memory;
    AFM_Stream    stream;

    AFM_FontInfo  FontInfo;

    FT_Int
    (*get_index)( const char*  name,
                  FT_Offset    len,
                  void*        user_data );

    void*         user_data;

  } AFM_ParserRec;


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                     TYPE1 CHARMAPS                            *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  typedef const struct T1_CMap_ClassesRec_*  T1_CMap_Classes;

  typedef struct T1_CMap_ClassesRec_
  {
    FT_CMap_Class  standard;
    FT_CMap_Class  expert;
    FT_CMap_Class  custom;
    FT_CMap_Class  unicode;

  } T1_CMap_ClassesRec;


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                        PSAux Module Interface                 *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  typedef struct  PSAux_ServiceRec_
  {
    /* don't use `PS_Table_Funcs' and friends to avoid compiler warnings */
    const PS_Table_FuncsRec*    ps_table_funcs;
    const PS_Parser_FuncsRec*   ps_parser_funcs;
    const T1_Builder_FuncsRec*  t1_builder_funcs;
    const T1_Decoder_FuncsRec*  t1_decoder_funcs;

    void
    (*t1_decrypt)( FT_Byte*   buffer,
                   FT_Offset  length,
                   FT_UShort  seed );

    FT_UInt32
    (*cff_random)( FT_UInt32  r );

    void
    (*ps_decoder_init)( PS_Decoder*  ps_decoder,
                        void*        decoder,
                        FT_Bool      is_t1 );

    void
    (*t1_make_subfont)( FT_Face      face,
                        PS_Private   priv,
                        CFF_SubFont  subfont );

    T1_CMap_Classes  t1_cmap_classes;

    /* fields after this comment line were added after version 2.1.10 */
    const AFM_Parser_FuncsRec*  afm_parser_funcs;

    const CFF_Decoder_FuncsRec*  cff_decoder_funcs;

  } PSAux_ServiceRec, *PSAux_Service;

  /* backward compatible type definition */
  typedef PSAux_ServiceRec   PSAux_Interface;


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                 Some convenience functions                    *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

#define IS_PS_NEWLINE( ch ) \
  ( (ch) == '\r' ||         \
    (ch) == '\n' )

#define IS_PS_SPACE( ch )  \
  ( (ch) == ' '         || \
    IS_PS_NEWLINE( ch ) || \
    (ch) == '\t'        || \
    (ch) == '\f'        || \
    (ch) == '\0' )

#define IS_PS_SPECIAL( ch )       \
  ( (ch) == '/'                || \
    (ch) == '(' || (ch) == ')' || \
    (ch) == '<' || (ch) == '>' || \
    (ch) == '[' || (ch) == ']' || \
    (ch) == '{' || (ch) == '}' || \
    (ch) == '%'                )

#define IS_PS_DELIM( ch )  \
  ( IS_PS_SPACE( ch )   || \
    IS_PS_SPECIAL( ch ) )

#define IS_PS_DIGIT( ch )        \
  ( (ch) >= '0' && (ch) <= '9' )

#define IS_PS_XDIGIT( ch )            \
  ( IS_PS_DIGIT( ch )              || \
    ( (ch) >= 'A' && (ch) <= 'F' ) || \
    ( (ch) >= 'a' && (ch) <= 'f' ) )

#define IS_PS_BASE85( ch )       \
  ( (ch) >= '!' && (ch) <= 'u' )

#define IS_PS_TOKEN( cur, limit, token )                                \
  ( (char)(cur)[0] == (token)[0]                                     && \
    ( (cur) + sizeof ( (token) ) == (limit) ||                          \
      ( (cur) + sizeof( (token) ) < (limit)          &&                 \
        IS_PS_DELIM( (cur)[sizeof ( (token) ) - 1] ) ) )             && \
    ft_strncmp( (char*)(cur), (token), sizeof ( (token) ) - 1 ) == 0 )


FT_END_HEADER

#endif /* PSAUX_H_ */


/* END */