misc/libfreetype/src/truetype/ttinterp.h
author nemo
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changeset 7649 df90970ae81a
parent 5172 88f2e05288ba
permissions -rw-r--r--
Correct snow fall/rotation (matching visual gear)
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/***************************************************************************/
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/*                                                                         */
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/*  ttinterp.h                                                             */
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/*                                                                         */
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/*    TrueType bytecode interpreter (specification).                       */
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/*                                                                         */
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/*  Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2010 by       */
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/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
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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 __TTINTERP_H__
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#define __TTINTERP_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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#ifndef TT_CONFIG_OPTION_STATIC_INTERPRETER /* indirect implementation */
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#define EXEC_OP_   TT_ExecContext  exc,
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#define EXEC_OP    TT_ExecContext  exc
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#define EXEC_ARG_  exc,
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#define EXEC_ARG   exc
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#else                                       /* static implementation */
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#define EXEC_OP_   /* void */
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#define EXEC_OP    /* void */
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#define EXEC_ARG_  /* void */
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#define EXEC_ARG   /* void */
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#endif /* TT_CONFIG_OPTION_STATIC_INTERPRETER */
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  /*************************************************************************/
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  /*                                                                       */
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  /* Rounding mode constants.                                              */
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  /*                                                                       */
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#define TT_Round_Off             5
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#define TT_Round_To_Half_Grid    0
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#define TT_Round_To_Grid         1
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#define TT_Round_To_Double_Grid  2
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#define TT_Round_Up_To_Grid      4
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#define TT_Round_Down_To_Grid    3
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#define TT_Round_Super           6
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#define TT_Round_Super_45        7
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  /*************************************************************************/
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  /*                                                                       */
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  /* Function types used by the interpreter, depending on various modes    */
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  /* (e.g. the rounding mode, whether to render a vertical or horizontal   */
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  /* line etc).                                                            */
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  /*                                                                       */
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  /*************************************************************************/
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  /* Rounding function */
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  typedef FT_F26Dot6
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  (*TT_Round_Func)( EXEC_OP_ FT_F26Dot6  distance,
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                             FT_F26Dot6  compensation );
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  /* Point displacement along the freedom vector routine */
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  typedef void
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  (*TT_Move_Func)( EXEC_OP_ TT_GlyphZone  zone,
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                            FT_UShort     point,
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                            FT_F26Dot6    distance );
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  /* Distance projection along one of the projection vectors */
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  typedef FT_F26Dot6
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  (*TT_Project_Func)( EXEC_OP_ FT_Pos   dx,
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                               FT_Pos   dy );
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  /* reading a cvt value.  Take care of non-square pixels if necessary */
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  typedef FT_F26Dot6
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  (*TT_Get_CVT_Func)( EXEC_OP_ FT_ULong  idx );
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  /* setting or moving a cvt value.  Take care of non-square pixels  */
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  /* if necessary                                                    */
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  typedef void
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  (*TT_Set_CVT_Func)( EXEC_OP_ FT_ULong    idx,
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                               FT_F26Dot6  value );
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  /*************************************************************************/
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  /*                                                                       */
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  /* This structure defines a call record, used to manage function calls.  */
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  /*                                                                       */
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  typedef struct  TT_CallRec_
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  {
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    FT_Int   Caller_Range;
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    FT_Long  Caller_IP;
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    FT_Long  Cur_Count;
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    FT_Long  Cur_Restart;
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  } TT_CallRec, *TT_CallStack;
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  /*************************************************************************/
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  /*                                                                       */
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  /* The main structure for the interpreter which collects all necessary   */
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  /* variables and states.                                                 */
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  /*                                                                       */
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  typedef struct  TT_ExecContextRec_
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  {
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    TT_Face            face;
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    TT_Size            size;
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    FT_Memory          memory;
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    /* instructions state */
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    FT_Error           error;      /* last execution error */
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    FT_Long            top;        /* top of exec. stack   */
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    FT_UInt            stackSize;  /* size of exec. stack  */
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    FT_Long*           stack;      /* current exec. stack  */
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    FT_Long            args;
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    FT_UInt            new_top;    /* new top after exec.  */
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    TT_GlyphZoneRec    zp0,        /* zone records */
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                       zp1,
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                       zp2,
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                       pts,
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                       twilight;
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    FT_Size_Metrics    metrics;
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    TT_Size_Metrics    tt_metrics; /* size metrics */
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    TT_GraphicsState   GS;         /* current graphics state */
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    FT_Int             curRange;  /* current code range number   */
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    FT_Byte*           code;      /* current code range          */
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    FT_Long            IP;        /* current instruction pointer */
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    FT_Long            codeSize;  /* size of current range       */
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    FT_Byte            opcode;    /* current opcode              */
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    FT_Int             length;    /* length of current opcode    */
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    FT_Bool            step_ins;  /* true if the interpreter must */
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                                  /* increment IP after ins. exec */
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    FT_ULong           cvtSize;
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    FT_Long*           cvt;
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    FT_UInt            glyphSize; /* glyph instructions buffer size */
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    FT_Byte*           glyphIns;  /* glyph instructions buffer */
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    FT_UInt            numFDefs;  /* number of function defs         */
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    FT_UInt            maxFDefs;  /* maximum number of function defs */
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    TT_DefArray        FDefs;     /* table of FDefs entries          */
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    FT_UInt            numIDefs;  /* number of instruction defs */
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    FT_UInt            maxIDefs;  /* maximum number of ins defs */
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    TT_DefArray        IDefs;     /* table of IDefs entries     */
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    FT_UInt            maxFunc;   /* maximum function index     */
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    FT_UInt            maxIns;    /* maximum instruction index  */
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    FT_Int             callTop,    /* top of call stack during execution */
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                       callSize;   /* size of call stack */
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    TT_CallStack       callStack;  /* call stack */
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    FT_UShort          maxPoints;    /* capacity of this context's `pts' */
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    FT_Short           maxContours;  /* record, expressed in points and  */
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                                     /* contours.                        */
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    TT_CodeRangeTable  codeRangeTable;  /* table of valid code ranges */
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                                        /* useful for the debugger   */
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    FT_UShort          storeSize;  /* size of current storage */
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    FT_Long*           storage;    /* storage area            */
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    FT_F26Dot6         period;     /* values used for the */
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    FT_F26Dot6         phase;      /* `SuperRounding'     */
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    FT_F26Dot6         threshold;
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#if 0
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    /* this seems to be unused */
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    FT_Int             cur_ppem;   /* ppem along the current proj vector */
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#endif
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    FT_Bool            instruction_trap; /* If `True', the interpreter will */
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                                         /* exit after each instruction     */
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    TT_GraphicsState   default_GS;       /* graphics state resulting from   */
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                                         /* the prep program                */
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    FT_Bool            is_composite;     /* true if the glyph is composite  */
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    FT_Bool            pedantic_hinting; /* true if pedantic interpretation */
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    /* latest interpreter additions */
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    FT_Long            F_dot_P;    /* dot product of freedom and projection */
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                                   /* vectors                               */
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    TT_Round_Func      func_round; /* current rounding function             */
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    TT_Project_Func    func_project,   /* current projection function */
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                       func_dualproj,  /* current dual proj. function */
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                       func_freeProj;  /* current freedom proj. func  */
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    TT_Move_Func       func_move;      /* current point move function */
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    TT_Move_Func       func_move_orig; /* move original position function */
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    TT_Get_CVT_Func    func_read_cvt;  /* read a cvt entry              */
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    TT_Set_CVT_Func    func_write_cvt; /* write a cvt entry (in pixels) */
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    TT_Set_CVT_Func    func_move_cvt;  /* incr a cvt entry (in pixels)  */
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    FT_Bool            grayscale;      /* are we hinting for grayscale? */
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  } TT_ExecContextRec;
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  extern const TT_GraphicsState  tt_default_graphics_state;
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  FT_LOCAL( FT_Error )
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  TT_Goto_CodeRange( TT_ExecContext  exec,
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                     FT_Int          range,
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                     FT_Long         IP );
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  FT_LOCAL( FT_Error )
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  TT_Set_CodeRange( TT_ExecContext  exec,
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                    FT_Int          range,
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                    void*           base,
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                    FT_Long         length );
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  FT_LOCAL( FT_Error )
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  TT_Clear_CodeRange( TT_ExecContext  exec,
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                      FT_Int          range );
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  FT_LOCAL( FT_Error )
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  Update_Max( FT_Memory  memory,
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              FT_ULong*  size,
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              FT_Long    multiplier,
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              void*      _pbuff,
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              FT_ULong   new_max );
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  /*************************************************************************/
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  /*                                                                       */
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  /* <Function>                                                            */
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  /*    TT_New_Context                                                     */
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  /*                                                                       */
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  /* <Description>                                                         */
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  /*    Queries the face context for a given font.  Note that there is     */
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  /*    now a _single_ execution context in the TrueType driver which is   */
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  /*    shared among faces.                                                */
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  /*                                                                       */
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  /* <Input>                                                               */
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  /*    face :: A handle to the source face object.                        */
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  /*                                                                       */
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  /* <Return>                                                              */
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  /*    A handle to the execution context.  Initialized for `face'.        */
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  /*                                                                       */
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  /* <Note>                                                                */
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  /*    Only the glyph loader and debugger should call this function.      */
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  /*                                                                       */
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  FT_EXPORT( TT_ExecContext )
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  TT_New_Context( TT_Driver  driver );
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  FT_LOCAL( FT_Error )
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  TT_Done_Context( TT_ExecContext  exec );
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  FT_LOCAL( FT_Error )
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  TT_Load_Context( TT_ExecContext  exec,
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                   TT_Face         face,
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                   TT_Size         size );
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  FT_LOCAL( FT_Error )
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  TT_Save_Context( TT_ExecContext  exec,
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                   TT_Size         ins );
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  FT_LOCAL( FT_Error )
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  TT_Run_Context( TT_ExecContext  exec,
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                  FT_Bool         debug );
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  /*************************************************************************/
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  /*                                                                       */
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  /* <Function>                                                            */
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  /*    TT_RunIns                                                          */
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  /*                                                                       */
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  /* <Description>                                                         */
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  /*    Executes one or more instruction in the execution context.  This   */
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  /*    is the main function of the TrueType opcode interpreter.           */
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  /*                                                                       */
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  /* <Input>                                                               */
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  /*    exec :: A handle to the target execution context.                  */
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  /*                                                                       */
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  /* <Return>                                                              */
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  /*    FreeType error code.  0 means success.                             */
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  /*                                                                       */
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  /* <Note>                                                                */
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  /*    Only the object manager and debugger should call this function.    */
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  /*                                                                       */
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  /*    This function is publicly exported because it is directly          */
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  /*    invoked by the TrueType debugger.                                  */
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  /*                                                                       */
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  FT_EXPORT( FT_Error )
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  TT_RunIns( TT_ExecContext  exec );
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FT_END_HEADER
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#endif /* __TTINTERP_H__ */
88f2e05288ba aaand let's add freetype as well while we are at it
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parents:
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88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
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   318
88f2e05288ba aaand let's add freetype as well while we are at it
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/* END */