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/***************************************************************************/ |
/* */ |
/* ttinterp.h */ |
/* */ |
/* TrueType bytecode interpreter (specification). */ |
/* */ |
/* Copyright 1996-2007, 2010, 2012-2013 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. */ |
/* */ |
/***************************************************************************/ |
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#ifndef __TTINTERP_H__ |
#define __TTINTERP_H__ |
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#include <ft2build.h> |
#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, |
#define EXEC_OP TT_ExecContext exc |
#define EXEC_ARG_ exc, |
#define EXEC_ARG exc |
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#else /* static implementation */ |
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#define EXEC_OP_ /* void */ |
#define EXEC_OP /* void */ |
#define EXEC_ARG_ /* void */ |
#define EXEC_ARG /* void */ |
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#endif /* TT_CONFIG_OPTION_STATIC_INTERPRETER */ |
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/*************************************************************************/ |
/* */ |
/* 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 |
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/*************************************************************************/ |
/* */ |
/* Function types used by the interpreter, depending on various modes */ |
/* (e.g. the rounding mode, whether to render a vertical or horizontal */ |
/* line etc). */ |
/* */ |
/*************************************************************************/ |
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/* Rounding function */ |
typedef FT_F26Dot6 |
(*TT_Round_Func)( EXEC_OP_ FT_F26Dot6 distance, |
FT_F26Dot6 compensation ); |
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/* Point displacement along the freedom vector routine */ |
typedef void |
(*TT_Move_Func)( EXEC_OP_ TT_GlyphZone zone, |
FT_UShort point, |
FT_F26Dot6 distance ); |
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/* Distance projection along one of the projection vectors */ |
typedef FT_F26Dot6 |
(*TT_Project_Func)( EXEC_OP_ FT_Pos dx, |
FT_Pos dy ); |
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/* reading a cvt value. Take care of non-square pixels if necessary */ |
typedef FT_F26Dot6 |
(*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 */ |
/* if necessary */ |
typedef void |
(*TT_Set_CVT_Func)( EXEC_OP_ FT_ULong idx, |
FT_F26Dot6 value ); |
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/*************************************************************************/ |
/* */ |
/* 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; |
FT_Long Cur_End; |
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} TT_CallRec, *TT_CallStack; |
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#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING |
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/*************************************************************************/ |
/* */ |
/* These structures define rules used to tweak subpixel hinting for */ |
/* various fonts. "", 0, "", NULL value indicates to match any value. */ |
/* */ |
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#define SPH_MAX_NAME_SIZE 32 |
#define SPH_MAX_CLASS_MEMBERS 100 |
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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; |
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} SPH_TweakRule; |
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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; |
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} SPH_ScaleRule; |
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typedef struct SPH_Font_Class_ |
{ |
const char name[SPH_MAX_NAME_SIZE]; |
const char member[SPH_MAX_CLASS_MEMBERS][SPH_MAX_NAME_SIZE]; |
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} SPH_Font_Class; |
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#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */ |
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/*************************************************************************/ |
/* */ |
/* 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; |
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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 */ |
FT_Long* stack; /* current exec. stack */ |
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FT_Long args; |
FT_UInt new_top; /* new top after exec. */ |
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TT_GlyphZoneRec zp0, /* zone records */ |
zp1, |
zp2, |
pts, |
twilight; |
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FT_Size_Metrics metrics; |
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 */ |
FT_Byte* code; /* current code range */ |
FT_Long IP; /* current instruction pointer */ |
FT_Long codeSize; /* size of current range */ |
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FT_Byte opcode; /* current opcode */ |
FT_Int length; /* length of current opcode */ |
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FT_Bool step_ins; /* true if the interpreter must */ |
/* increment IP after ins. exec */ |
FT_ULong cvtSize; |
FT_Long* cvt; |
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FT_UInt glyphSize; /* glyph instructions buffer size */ |
FT_Byte* glyphIns; /* glyph instructions buffer */ |
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FT_UInt numFDefs; /* number of function defs */ |
FT_UInt maxFDefs; /* maximum number of function defs */ |
TT_DefArray FDefs; /* table of FDefs entries */ |
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FT_UInt numIDefs; /* number of instruction defs */ |
FT_UInt maxIDefs; /* maximum number of ins defs */ |
TT_DefArray IDefs; /* table of IDefs entries */ |
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FT_UInt maxFunc; /* maximum function index */ |
FT_UInt maxIns; /* maximum instruction index */ |
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FT_Int callTop, /* top of call stack during execution */ |
callSize; /* size of call stack */ |
TT_CallStack callStack; /* call stack */ |
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FT_UShort maxPoints; /* capacity of this context's `pts' */ |
FT_Short maxContours; /* record, expressed in points and */ |
/* contours. */ |
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TT_CodeRangeTable codeRangeTable; /* table of valid code ranges */ |
/* useful for the debugger */ |
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FT_UShort storeSize; /* size of current storage */ |
FT_Long* storage; /* storage area */ |
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FT_F26Dot6 period; /* values used for the */ |
FT_F26Dot6 phase; /* `SuperRounding' */ |
FT_F26Dot6 threshold; |
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#if 0 |
/* this seems to be unused */ |
FT_Int cur_ppem; /* ppem along the current proj vector */ |
#endif |
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FT_Bool instruction_trap; /* If `True', the interpreter will */ |
/* exit after each instruction */ |
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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 */ |
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/* latest interpreter additions */ |
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FT_Long F_dot_P; /* dot product of freedom and projection */ |
/* vectors */ |
TT_Round_Func func_round; /* current rounding function */ |
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TT_Project_Func func_project, /* current projection function */ |
func_dualproj, /* current dual proj. function */ |
func_freeProj; /* current freedom proj. func */ |
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TT_Move_Func func_move; /* current point move function */ |
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 */ |
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) */ |
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FT_Bool grayscale; /* are we hinting for grayscale? */ |
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#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING |
TT_Round_Func func_round_sphn; /* subpixel rounding function */ |
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FT_Bool grayscale_hinting; /* Using grayscale hinting? */ |
FT_Bool subpixel_hinting; /* Using subpixel hinting? */ |
FT_Bool native_hinting; /* Using native hinting? */ |
FT_Bool ignore_x_mode; /* Standard rendering mode for */ |
/* subpixel hinting. On if gray */ |
/* or subpixel hinting is on ) */ |
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/* The following 4 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 subpixel_positioned; /* subpixel positioned */ |
/* (DirectWrite ClearType)? */ |
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FT_Int rasterizer_version; /* MS rasterizer version */ |
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FT_Bool iup_called; /* IUP called for glyph? */ |
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FT_ULong sph_tweak_flags; /* flags to control */ |
/* hint tweaks */ |
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FT_ULong sph_in_func_flags; /* flags to indicate if in */ |
/* special functions */ |
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#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */ |
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} TT_ExecContextRec; |
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extern const TT_GraphicsState tt_default_graphics_state; |
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#ifdef TT_USE_BYTECODE_INTERPRETER |
FT_LOCAL( FT_Error ) |
TT_Goto_CodeRange( TT_ExecContext exec, |
FT_Int range, |
FT_Long IP ); |
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FT_LOCAL( FT_Error ) |
TT_Set_CodeRange( TT_ExecContext exec, |
FT_Int range, |
void* base, |
FT_Long length ); |
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FT_LOCAL( FT_Error ) |
TT_Clear_CodeRange( TT_ExecContext exec, |
FT_Int range ); |
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FT_LOCAL( FT_Error ) |
Update_Max( FT_Memory memory, |
FT_ULong* size, |
FT_Long multiplier, |
void* _pbuff, |
FT_ULong new_max ); |
#endif /* TT_USE_BYTECODE_INTERPRETER */ |
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/*************************************************************************/ |
/* */ |
/* <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. */ |
/* */ |
FT_EXPORT( TT_ExecContext ) |
TT_New_Context( TT_Driver driver ); |
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#ifdef TT_USE_BYTECODE_INTERPRETER |
FT_LOCAL( FT_Error ) |
TT_Done_Context( TT_ExecContext exec ); |
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FT_LOCAL( FT_Error ) |
TT_Load_Context( TT_ExecContext exec, |
TT_Face face, |
TT_Size size ); |
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FT_LOCAL( FT_Error ) |
TT_Save_Context( TT_ExecContext exec, |
TT_Size ins ); |
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FT_LOCAL( FT_Error ) |
TT_Run_Context( TT_ExecContext exec, |
FT_Bool debug ); |
#endif /* TT_USE_BYTECODE_INTERPRETER */ |
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/*************************************************************************/ |
/* */ |
/* <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 ); |
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FT_END_HEADER |
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#endif /* __TTINTERP_H__ */ |
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/* END */ |