kc3-lang/freetype/src/truetype/ttinterp.h

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• Hash : a90663f5
  Author :
  Date : 2000-07-08T00:41:13
  

  vast clean-up of the sources in order to allow flat directory compilation (by defining the FT_FLAT_COMPILE macro at compile time..) moved "freetype2/BUILD" to "freetype2/docs/BUILD"

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• src/truetype/ttinterp.h

• /***************************************************************************/
  /*                                                                         */
  /*  ttinterp.h                                                             */
  /*                                                                         */
  /*    TrueType bytecode interpreter (specification).                       */
  /*                                                                         */
  /*  Copyright 1996-2000 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 TTINTERP_H
  #define TTINTERP_H
  
  #ifdef FT_FLAT_COMPILE
  #include "ttobjs.h"
  #else
  #include <truetype/ttobjs.h>
  #endif
  
  
  
  #ifdef __cplusplus
    extern "C" {
  #endif
  
  
  #ifndef TT_CONFIG_OPTION_STATIC_INTEPRETER  /* indirect implementation */
  
  #define EXEC_OP_   TT_ExecContext  exc,
  #define EXEC_OP    TT_ExecContext  exc
  #define EXEC_ARG_  exc,
  #define EXEC_ARG   exc
  
  #else                                       /* static implementation */
  
  #define EXEC_OP_   /* void */
  #define EXEC_OP    /* void */
  #define EXEC_ARG_  /* void */
  #define EXEC_ARG   /* void */
  
  #endif /* TT_CONFIG_OPTION_STATIC_INTERPRETER */
  
  
    /*************************************************************************/
    /*                                                                       */
    /* Rounding mode constants.                                              */
    /*                                                                       */
  #define TT_Round_Off             5
  #define TT_Round_To_Half_Grid    0
  #define TT_Round_To_Grid         1
  #define TT_Round_To_Double_Grid  2
  #define TT_Round_Up_To_Grid      4
  #define TT_Round_Down_To_Grid    3
  #define TT_Round_Super           6
  #define TT_Round_Super_45        7
  
  
    /*************************************************************************/
    /*                                                                       */
    /* Function types used by the interpreter, depending on various modes    */
    /* (e.g. the rounding mode, whether to render a vertical or horizontal   */
    /* line etc).                                                            */
    /*                                                                       */
    /*************************************************************************/
  
    /* Rounding function */
    typedef FT_F26Dot6  (*TT_Round_Func)( EXEC_OP_ FT_F26Dot6  distance,
                                                   FT_F26Dot6  compensation );
  
    /* Point displacement along the freedom vector routine */
    typedef void  (*TT_Move_Func)( EXEC_OP_ TT_GlyphZone*  zone,
                                            FT_UInt        point,
                                            FT_F26Dot6     distance );
  
    /* Distance projection along one of the projection vectors */
    typedef FT_F26Dot6  (*TT_Project_Func)( EXEC_OP_ FT_Vector*  v1,
                                                     FT_Vector*  v2 );
  
    /* reading a cvt value.  Take care of non-square pixels if necessary */
    typedef FT_F26Dot6  (*TT_Get_CVT_Func)( EXEC_OP_ FT_ULong  index );
  
    /* setting or moving a cvt value.  Take care of non-square pixels  */
    /* if necessary                                                    */
    typedef void  (*TT_Set_CVT_Func)( EXEC_OP_ FT_ULong    index,
                                               FT_F26Dot6  value );
  
  
    /*************************************************************************/
    /*                                                                       */
    /* This structure defines a call record, used to manage function calls.  */
    /*                                                                       */
    typedef struct  TT_CallRec_
    {
      FT_Int   Caller_Range;
      FT_Long  Caller_IP;
      FT_Long  Cur_Count;
      FT_Long  Cur_Restart;
  
    } TT_CallRec, *TT_CallStack;
  
  
    /*************************************************************************/
    /*                                                                       */
    /* The main structure for the interpreter which collects all necessary   */
    /* variables and states.                                                 */
    /*                                                                       */
    typedef struct  TT_ExecContextRec_
    {
      TT_Face         face;
      TT_Size         size;
      FT_Memory       memory;
  
      /* instructions state */
  
      FT_Error        error;      /* last execution error */
  
      FT_Long         top;        /* top of exec. stack   */
  
      FT_UInt         stackSize;  /* size of exec. stack  */
      FT_Long*        stack;      /* current exec. stack  */
  
      FT_Long         args;
      FT_UInt         new_top;    /* new top after exec.  */
  
      TT_GlyphZone    zp0,        /* zone records */
                      zp1,
                      zp2,
                      pts,
                      twilight;
  
      FT_Size_Metrics  metrics;
      TT_Size_Metrics  tt_metrics; /* size metrics */
  
      TT_GraphicsState  GS;         /* current graphics state */
  
      FT_Int          curRange;  /* current code range number   */
      FT_Byte*        code;      /* current code range          */
      FT_Long         IP;        /* current instruction pointer */
      FT_Long         codeSize;  /* size of current range       */
  
      FT_Byte         opcode;    /* current opcode              */
      FT_Int          length;    /* length of current opcode    */
  
      FT_Bool         step_ins;  /* true if the interpreter must */
                                 /* increment IP after ins. exec */
      FT_Long         cvtSize;
      FT_Long*        cvt;
  
      FT_UInt         glyphSize; /* glyph instructions buffer size */
      FT_Byte*        glyphIns;  /* glyph instructions buffer */
  
      FT_UInt         numFDefs;  /* number of function defs         */
      FT_UInt         maxFDefs;  /* maximum number of function defs */
      TT_DefArray     FDefs;     /* table of FDefs entries          */
  
      FT_UInt         numIDefs;  /* number of instruction defs */
      FT_UInt         maxIDefs;  /* maximum number of ins defs */
      TT_DefArray     IDefs;     /* table of IDefs entries     */
  
      FT_UInt         maxFunc;   /* maximum function index     */
      FT_UInt         maxIns;    /* maximum instruction index  */
  
      FT_Int          callTop,    /* top of call stack during execution */
                      callSize;   /* size of call stack */
      TT_CallStack    callStack;  /* call stack */
  
      FT_UShort       maxPoints;    /* capacity of this context's `pts' */
      FT_Short        maxContours;  /* record, expressed in points and  */
                                    /* contours.                        */
  
      TT_CodeRangeTable  codeRangeTable;  /* table of valid code ranges */
                                          /* useful for the debugger   */
  
      FT_UShort       storeSize;  /* size of current storage */
      FT_Long*        storage;    /* storage area            */
  
      FT_F26Dot6      period;     /* values used for the */
      FT_F26Dot6      phase;      /* `SuperRounding'     */
      FT_F26Dot6      threshold;
  
  #if 0
      /* this seems to be unused */
      FT_Int          cur_ppem;       /* ppem along the current proj vector */
  #endif
  
      FT_Bool         instruction_trap;  /* If `True', the interpreter will */
                                         /* exit after each instruction     */
  
      TT_GraphicsState  default_GS;      /* graphics state resulting from    */
                                         /* the prep program                 */
      FT_Bool          is_composite;     /* true if the glyph is composite   */
      FT_Bool          pedantic_hinting; /* true for pedantic interpretation */
  
      /* latest interpreter additions */
  
      FT_Long            F_dot_P;    /* dot product of freedom and projection */
                                     /* vectors                               */
      TT_Round_Func      func_round; /* current rounding function             */
  
      TT_Project_Func    func_project,   /* current projection function */
                         func_dualproj,  /* current dual proj. function */
                         func_freeProj;  /* current freedom proj. func  */
  
      TT_Move_Func       func_move;      /* current point move function */
  
      TT_Get_CVT_Func    func_read_cvt;  /* read a cvt entry              */
      TT_Set_CVT_Func    func_write_cvt; /* write a cvt entry (in pixels) */
      TT_Set_CVT_Func    func_move_cvt;  /* incr a cvt entry (in pixels)  */
  
      FT_ULong           loadSize;
      TT_SubGlyph_Stack  loadStack;      /* loading subglyph stack */
  
    } TT_ExecContextRec;
  
  
    extern const TT_GraphicsState  tt_default_graphics_state;
  
  
    LOCAL_DEF
    FT_Error  TT_Goto_CodeRange( TT_ExecContext  exec,
                                 FT_Int          range,
                                 FT_Long         IP );
  
    LOCAL_DEF
    FT_Error  TT_Set_CodeRange( TT_ExecContext  exec,
                                FT_Int          range,
                                void*           base,
                                FT_Long         length );
  
    LOCAL_DEF
    FT_Error  TT_Clear_CodeRange( TT_ExecContext  exec,
                                  FT_Int          range );
  
    FT_EXPORT_DEF( TT_ExecContext )  TT_New_Context( TT_Face  face );
  
    LOCAL_DEF
    FT_Error  TT_Done_Context( TT_ExecContext  exec );
  
    LOCAL_DEF
    FT_Error  TT_Destroy_Context( TT_ExecContext  exec,
                                  FT_Memory       memory );
  
    LOCAL_DEF
    FT_Error  TT_Load_Context( TT_ExecContext  exec,
                               TT_Face         face,
                               TT_Size         size );
  
    LOCAL_DEF
    FT_Error  TT_Save_Context( TT_ExecContext  exec,
                               TT_Size         ins );
  
    LOCAL_DEF
    FT_Error  TT_Run_Context( TT_ExecContext  exec,
                              FT_Bool         debug );
  
    FT_EXPORT_DEF( FT_Error )  TT_RunIns( TT_ExecContext  exec );
  
  
  #ifdef __cplusplus
    }
  #endif
  
  #endif /* TTINTERP_H */
  
  
  /* END */
  

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