psaux.h

读写pdf文件的程序开发库源码,对于编写开发库有所帮助.

    FT_Error
    (*load_field)( T1_Parser*       parser,
                   const T1_Field*  field,
                   void**           objects,
                   FT_UInt          max_objects,
                   FT_ULong*        pflags );

    FT_Error
    (*load_field_table)( T1_Parser*       parser,
                         const T1_Field*  field,
                         void**           objects,
                         FT_UInt          max_objects,
                         FT_ULong*        pflags );

  } T1_Parser_Funcs;


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    T1_Parser                                                          */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A T1_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.                     */
  /*                                                                       */
  struct T1_Parser_
  {
    FT_Byte*         cursor;
    FT_Byte*         base;
    FT_Byte*         limit;
    FT_Error         error;
    FT_Memory        memory;

    T1_Parser_Funcs  funcs;
  };



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


  typedef struct T1_Builder_  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 struct  T1_Builder_Funcs_
  {
    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_Funcs;



  /*************************************************************************/
  /*                                                                       */
  /* <Structure>                                                           */
  /*    T1_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.                         */
  /*                                                                       */
  /*    max_points   :: maximum points in builder outline                  */
  /*                                                                       */
  /*    max_contours :: Maximal number of contours in builder outline.     */
  /*                                                                       */
  /*    last         :: The last point position.                           */
  /*                                                                       */
  /*    scale_x      :: The horizontal scale (FUnits to sub-pixels).       */
  /*                                                                       */
  /*    scale_y      :: The vertical scale (FUnits to sub-pixels).         */
  /*                                                                       */
  /*    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.                                  */
  /*                                                                       */
  /*    error        :: An error code that is only used to report memory   */
  /*                    allocation problems.                               */
  /*                                                                       */
  /*    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.     */
  /*                                                                       */
  struct  T1_Builder_
  {
    FT_Memory         memory;
    FT_Face           face;
    FT_GlyphSlot      glyph;
    FT_GlyphLoader*   loader;
    FT_Outline*       base;
    FT_Outline*       current;

    FT_Vector         last;

    FT_Fixed          scale_x;
    FT_Fixed          scale_y;

    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           shift;

    FT_Error          error;         /* only used for memory errors */
    FT_Bool           metrics_only;

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

    T1_Builder_Funcs  funcs;      
  };


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                         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_Zone_
  {
    FT_Byte*  cursor;
    FT_Byte*  base;
    FT_Byte*  limit;

  } T1_Decoder_Zone;


  typedef struct T1_Decoder_        T1_Decoder;
  typedef struct T1_Decoder_Funcs_  T1_Decoder_Funcs;


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


  struct  T1_Decoder_Funcs_
  {
    FT_Error
    (*init) ( T1_Decoder*          decoder,
              FT_Face              face,
              FT_Size              size,
              FT_GlyphSlot         slot,
              FT_Byte**            glyph_names,
              T1_Blend*            blend,
              FT_Bool              hinting,
              T1_Decoder_Callback  callback );

    void
    (*done) ( T1_Decoder*  decoder );

    FT_Error
    (*parse_charstrings)( T1_Decoder*  decoder,
                          FT_Byte*     base,
                          FT_UInt      len );
  };


  struct  T1_Decoder_
  {
    T1_Builder           builder;

    FT_Long              stack[T1_MAX_CHARSTRINGS_OPERANDS];
    FT_Long*             top;

    T1_Decoder_Zone      zones[T1_MAX_SUBRS_CALLS + 1];
    T1_Decoder_Zone*     zone;

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

    FT_Int               lenIV;        /* internal for sub routine calls */
    FT_UInt              num_subrs;
    FT_Byte**            subrs;
    FT_Int*              subrs_len;    /* array of subrs length (optional) */

    FT_Matrix            font_matrix;
    FT_Vector            font_offset;

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

    T1_Blend*            blend;       /* for multiple master support */

    T1_Decoder_Callback  parse_callback;
    T1_Decoder_Funcs     funcs;
  };


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

  typedef struct  PSAux_Interface_
  {
    const PS_Table_Funcs*    ps_table_funcs;
    const T1_Parser_Funcs*   t1_parser_funcs;
    const T1_Builder_Funcs*  t1_builder_funcs;
    const T1_Decoder_Funcs*  t1_decoder_funcs;

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

  } PSAux_Interface;


FT_END_HEADER

#endif /* __PSAUX_H__ */


/* END */