Update freetype sources (2.6.2) in third party.

third_party/freetype2/src/src/truetype/ttinterp.h

Index: third_party/freetype2/src/src/truetype/ttinterp.h
diff --git a/third_party/freetype2/src/src/truetype/ttinterp.h b/third_party/freetype2/src/src/truetype/ttinterp.h
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index 0000000000000000000000000000000000000000..32706d076047a04b2a6cc8dad56300a8e40788fd
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+++ b/third_party/freetype2/src/src/truetype/ttinterp.h
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+/***************************************************************************/
+/*                                                                         */
+/*  ttinterp.h                                                             */
+/*                                                                         */
+/*    TrueType bytecode interpreter (specification).                       */
+/*                                                                         */
+/*  Copyright 1996-2015 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__
+
+#include <ft2build.h>
+#include "ttobjs.h"
+
+
+FT_BEGIN_HEADER
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* 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)( TT_ExecContext  exc,
+                    FT_F26Dot6      distance,
+                    FT_F26Dot6      compensation );
+
+  /* Point displacement along the freedom vector routine */
+  typedef void
+  (*TT_Move_Func)( TT_ExecContext  exc,
+                   TT_GlyphZone    zone,
+                   FT_UShort       point,
+                   FT_F26Dot6      distance );
+
+  /* Distance projection along one of the projection vectors */
+  typedef FT_F26Dot6
+  (*TT_Project_Func)( TT_ExecContext  exc,
+                      FT_Pos          dx,
+                      FT_Pos          dy );
+
+  /* getting current ppem.  Take care of non-square pixels if necessary */
+  typedef FT_Long
+  (*TT_Cur_Ppem_Func)( TT_ExecContext  exc );
+
+  /* reading a cvt value.  Take care of non-square pixels if necessary */
+  typedef FT_F26Dot6
+  (*TT_Get_CVT_Func)( TT_ExecContext  exc,
+                      FT_ULong        idx );
+
+  /* setting or moving a cvt value.  Take care of non-square pixels  */
+  /* if necessary                                                    */
+  typedef void
+  (*TT_Set_CVT_Func)( TT_ExecContext  exc,
+                      FT_ULong        idx,
+                      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;
+
+    TT_DefRecord  *Def; /* either FDEF or IDEF */
+
+  } TT_CallRec, *TT_CallStack;
+
+
+#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* These structures define rules used to tweak subpixel hinting for      */
+  /* various fonts.  "", 0, "", NULL value indicates to match any value.   */
+  /*                                                                       */
+
+#define SPH_MAX_NAME_SIZE      32
+#define SPH_MAX_CLASS_MEMBERS  100
+
+  typedef struct  SPH_TweakRule_
+  {
+    const char      family[SPH_MAX_NAME_SIZE];
+    const FT_UInt   ppem;
+    const char      style[SPH_MAX_NAME_SIZE];
+    const FT_ULong  glyph;
+
+  } SPH_TweakRule;
+
+
+  typedef struct  SPH_ScaleRule_
+  {
+    const char      family[SPH_MAX_NAME_SIZE];
+    const FT_UInt   ppem;
+    const char      style[SPH_MAX_NAME_SIZE];
+    const FT_ULong  glyph;
+    const FT_ULong  scale;
+
+  } SPH_ScaleRule;
+
+
+  typedef struct  SPH_Font_Class_
+  {
+    const char  name[SPH_MAX_NAME_SIZE];
+    const char  member[SPH_MAX_CLASS_MEMBERS][SPH_MAX_NAME_SIZE];
+
+  } SPH_Font_Class;
+
+#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* 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_Long            stackSize;  /* size of exec. stack  */
+    FT_Long*           stack;      /* current exec. stack  */
+
+    FT_Long            args;
+    FT_Long            new_top;    /* new top after exec.  */
+
+    TT_GlyphZoneRec    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_ULong           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;
+
+    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 if 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_Move_Func       func_move_orig; /* move original position function */
+
+    TT_Cur_Ppem_Func   func_cur_ppem;  /* get current proj. ppem value  */
+
+    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_Bool            grayscale;      /* are we hinting for grayscale? */
+
+#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
+    TT_Round_Func      func_round_sphn;   /* subpixel rounding function */
+
+    FT_Bool            subpixel_hinting;  /* Using subpixel hinting?       */
+    FT_Bool            ignore_x_mode;     /* Standard rendering mode for   */
+                                          /* subpixel hinting.  On if gray */
+                                          /* or subpixel hinting is on.    */
+
+    /* The following 6 aren't fully implemented but here for MS rasterizer */
+    /* compatibility.                                                      */
+    FT_Bool            compatible_widths;     /* compatible widths?        */
+    FT_Bool            symmetrical_smoothing; /* symmetrical_smoothing?    */
+    FT_Bool            bgr;                   /* bgr instead of rgb?       */
+    FT_Bool            vertical_lcd;          /* long side of LCD subpixel */
+                                              /* rectangles is horizontal  */
+    FT_Bool            subpixel_positioned;   /* subpixel positioned       */
+                                              /* (DirectWrite ClearType)?  */
+    FT_Bool            gray_cleartype;        /* ClearType hinting but     */
+                                              /* grayscale rendering       */
+
+    FT_Int             rasterizer_version;    /* MS rasterizer version     */
+
+    FT_Bool            iup_called;            /* IUP called for glyph?     */
+
+    FT_ULong           sph_tweak_flags;       /* flags to control          */
+                                              /* hint tweaks               */
+
+    FT_ULong           sph_in_func_flags;     /* flags to indicate if in   */
+                                              /* special functions         */
+
+#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */
+
+  } TT_ExecContextRec;
+
+
+  extern const TT_GraphicsState  tt_default_graphics_state;
+
+
+#ifdef TT_USE_BYTECODE_INTERPRETER
+  FT_LOCAL( void )
+  TT_Goto_CodeRange( TT_ExecContext  exec,
+                     FT_Int          range,
+                     FT_Long         IP );
+
+  FT_LOCAL( void )
+  TT_Set_CodeRange( TT_ExecContext  exec,
+                    FT_Int          range,
+                    void*           base,
+                    FT_Long         length );
+
+  FT_LOCAL( void )
+  TT_Clear_CodeRange( TT_ExecContext  exec,
+                      FT_Int          range );
+
+
+  FT_LOCAL( FT_Error )
+  Update_Max( FT_Memory  memory,
+              FT_ULong*  size,
+              FT_ULong   multiplier,
+              void*      _pbuff,
+              FT_ULong   new_max );
+#endif /* TT_USE_BYTECODE_INTERPRETER */
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* <Function>                                                            */
+  /*    TT_New_Context                                                     */
+  /*                                                                       */
+  /* <Description>                                                         */
+  /*    Queries the face context for a given font.  Note that there is     */
+  /*    now a _single_ execution context in the TrueType driver which is   */
+  /*    shared among faces.                                                */
+  /*                                                                       */
+  /* <Input>                                                               */
+  /*    face :: A handle to the source face object.                        */
+  /*                                                                       */
+  /* <Return>                                                              */
+  /*    A handle to the execution context.  Initialized for `face'.        */
+  /*                                                                       */
+  /* <Note>                                                                */
+  /*    Only the glyph loader and debugger should call this function.      */
+  /*    (And right now only the glyph loader uses it.)                     */
+  /*                                                                       */
+  FT_EXPORT( TT_ExecContext )
+  TT_New_Context( TT_Driver  driver );
+
+
+#ifdef TT_USE_BYTECODE_INTERPRETER
+  FT_LOCAL( void )
+  TT_Done_Context( TT_ExecContext  exec );
+
+  FT_LOCAL( FT_Error )
+  TT_Load_Context( TT_ExecContext  exec,
+                   TT_Face         face,
+                   TT_Size         size );
+
+  FT_LOCAL( void )
+  TT_Save_Context( TT_ExecContext  exec,
+                   TT_Size         ins );
+
+  FT_LOCAL( FT_Error )
+  TT_Run_Context( TT_ExecContext  exec );
+#endif /* TT_USE_BYTECODE_INTERPRETER */
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* <Function>                                                            */
+  /*    TT_RunIns                                                          */
+  /*                                                                       */
+  /* <Description>                                                         */
+  /*    Executes one or more instruction in the execution context.  This   */
+  /*    is the main function of the TrueType opcode interpreter.           */
+  /*                                                                       */
+  /* <Input>                                                               */
+  /*    exec :: A handle to the target execution context.                  */
+  /*                                                                       */
+  /* <Return>                                                              */
+  /*    FreeType error code.  0 means success.                             */
+  /*                                                                       */
+  /* <Note>                                                                */
+  /*    Only the object manager and debugger should call this function.    */
+  /*                                                                       */
+  /*    This function is publicly exported because it is directly          */
+  /*    invoked by the TrueType debugger.                                  */
+  /*                                                                       */
+  FT_EXPORT( FT_Error )
+  TT_RunIns( TT_ExecContext  exec );
+
+
+FT_END_HEADER
+
+#endif /* __TTINTERP_H__ */
+
+
+/* END */