freetype2/src/truetype/ttinterp.h

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/***************************************************************************/
/* */
/* ttinterp.h */
/* */
/* TrueType bytecode interpreter (specification). */
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/* */
[truetype] Support subpixel hinting. This is the large, famous `Infinality' patch to support ClearType bytecode which has been available from http://www.infinality.net/blog/ for some time, and which has been refined over the last years. While still experimental, it is now mature enough to be included directly into FreeType. Most of the code is based on the ClearType whitepaper written by Greg Hitchcock http://www.microsoft.com/typography/cleartype/truetypecleartype.aspx which gives a detailed overview of the necessary changes to the Microsoft rasterizer so that older fonts are supported. However, a lot of details are still missing, and this patches provides a framework to easily handle rendering issues down to the glyph level of certain fonts. Note that ClearType support is not completely implemented! In particular, full support for the options `compatible_widths', `symmetrical_smoothing, and `bgr' (via the GETINFO bytecode instruction) is missing. * src/truetype/ttsubpix.c: New file, providing code to handle `tweaks', this is, rules for certain glyphs in certain fonts (including wildcards) which need a special treatment. * src/truetype/ttsubpix.h: New file, holding the tweaking rules. * include/freetype/config/ftoption.h, src/devel/ftoption.h (TT_CONFIG_OPTION_SUBPIXEL_HINTING): New macro. * include/freetype/internal/ftobjs.h (FT_PIX_FLOOR_GRID, FT_PIX_ROUND_GRID, FT_PIX_CEIL_GRID): New macros. * src/truetype/truetype.c [TT_USE_BYTECODE_INTERPRETER]: Include `ttsubpix.c'. * src/truetype/ttgload.c: Include `ttsubpix.h'. [All changes below are guarded by TT_CONFIG_OPTION_SUBPIXEL_HINTING.] (tt_get_metrics): Set tweak flags. (TT_Hint_Glyph): Call `FT_Outline_EmboldenXY' if necessary. (TT_Process_Simple_Glyph): Compensate emboldening if necessary. (compute_glyph_metrics): Handle `compatible widths' option. (tt_loader_init): Handle ClearType GETINFO information bits. * src/truetype/rules.mk (TT_DRC_SRC): Updated. * src/truetype/ttinterp.c: Include `ttsubpix.h'. [Where necessary, changes below are guarded by TT_CONFIG_OPTION_SUBPIXEL_HINTING.] (Direct_Move, Direct_Move_X): Extended. (Round_None, Round_To_Grid, Round_To_Half_Grid, Round_Down_To_Grid, Round_Up_To_Grid, Round_To_Double_Grid, Round_Super, Round_Super_45, SetSuperRound): Add parameter to handle the number of grid lines per pixel. (SET_SuperRound, ROUND_None, CUR_Func_round): Updated. (DO_SROUND, DOS45ROUND, DO_ODD, DO_EVEN): Updated. (DO_ROUND, DO_NROUND): Updated. (DO_RS): Take care of `Typeman' bytecode patterns. (Ins_FDEF): Add some debugging code. Commented out. (Ins_ENDF): Restore state. (Ins_CALL, Ins_LOOPCALL): Handle inline delta functions. (Ins_MD): Handle `Vacuform' rounds. (Move_Zp2_Point, Ins_SHPIX, Ins_MSIRP, Ins_MDAP, Ins_MIAP, Ins_MDRP, Ins_MIRP): Handle tweaks. (Ins_ALIGNRP): Add tweak guard. (Ins_IUP, Ins_DELTAP): Handle tweaks. (Ins_GETINFO): Handle new ClearType bits. (TT_RunIns): Handle tweaks. * src/truetype/ttinterp.h: Updated. (SPH_TweakRule, SPH_ScaleRule): New structures for tweaks. (TT_ExecContextRec): Add members for subpixel hinting support. * src/truetype/ttobjs.h (TT_DefRecord): Add `inline_delta' member.
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/* Copyright 1996-2007, 2010, 2012 by */
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/* 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 */
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/* 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__
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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
/*************************************************************************/
/* */
/* 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 */
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typedef FT_F26Dot6
(*TT_Round_Func)( EXEC_OP_ FT_F26Dot6 distance,
[truetype] Support subpixel hinting. This is the large, famous `Infinality' patch to support ClearType bytecode which has been available from http://www.infinality.net/blog/ for some time, and which has been refined over the last years. While still experimental, it is now mature enough to be included directly into FreeType. Most of the code is based on the ClearType whitepaper written by Greg Hitchcock http://www.microsoft.com/typography/cleartype/truetypecleartype.aspx which gives a detailed overview of the necessary changes to the Microsoft rasterizer so that older fonts are supported. However, a lot of details are still missing, and this patches provides a framework to easily handle rendering issues down to the glyph level of certain fonts. Note that ClearType support is not completely implemented! In particular, full support for the options `compatible_widths', `symmetrical_smoothing, and `bgr' (via the GETINFO bytecode instruction) is missing. * src/truetype/ttsubpix.c: New file, providing code to handle `tweaks', this is, rules for certain glyphs in certain fonts (including wildcards) which need a special treatment. * src/truetype/ttsubpix.h: New file, holding the tweaking rules. * include/freetype/config/ftoption.h, src/devel/ftoption.h (TT_CONFIG_OPTION_SUBPIXEL_HINTING): New macro. * include/freetype/internal/ftobjs.h (FT_PIX_FLOOR_GRID, FT_PIX_ROUND_GRID, FT_PIX_CEIL_GRID): New macros. * src/truetype/truetype.c [TT_USE_BYTECODE_INTERPRETER]: Include `ttsubpix.c'. * src/truetype/ttgload.c: Include `ttsubpix.h'. [All changes below are guarded by TT_CONFIG_OPTION_SUBPIXEL_HINTING.] (tt_get_metrics): Set tweak flags. (TT_Hint_Glyph): Call `FT_Outline_EmboldenXY' if necessary. (TT_Process_Simple_Glyph): Compensate emboldening if necessary. (compute_glyph_metrics): Handle `compatible widths' option. (tt_loader_init): Handle ClearType GETINFO information bits. * src/truetype/rules.mk (TT_DRC_SRC): Updated. * src/truetype/ttinterp.c: Include `ttsubpix.h'. [Where necessary, changes below are guarded by TT_CONFIG_OPTION_SUBPIXEL_HINTING.] (Direct_Move, Direct_Move_X): Extended. (Round_None, Round_To_Grid, Round_To_Half_Grid, Round_Down_To_Grid, Round_Up_To_Grid, Round_To_Double_Grid, Round_Super, Round_Super_45, SetSuperRound): Add parameter to handle the number of grid lines per pixel. (SET_SuperRound, ROUND_None, CUR_Func_round): Updated. (DO_SROUND, DOS45ROUND, DO_ODD, DO_EVEN): Updated. (DO_ROUND, DO_NROUND): Updated. (DO_RS): Take care of `Typeman' bytecode patterns. (Ins_FDEF): Add some debugging code. Commented out. (Ins_ENDF): Restore state. (Ins_CALL, Ins_LOOPCALL): Handle inline delta functions. (Ins_MD): Handle `Vacuform' rounds. (Move_Zp2_Point, Ins_SHPIX, Ins_MSIRP, Ins_MDAP, Ins_MIAP, Ins_MDRP, Ins_MIRP): Handle tweaks. (Ins_ALIGNRP): Add tweak guard. (Ins_IUP, Ins_DELTAP): Handle tweaks. (Ins_GETINFO): Handle new ClearType bits. (TT_RunIns): Handle tweaks. * src/truetype/ttinterp.h: Updated. (SPH_TweakRule, SPH_ScaleRule): New structures for tweaks. (TT_ExecContextRec): Add members for subpixel hinting support. * src/truetype/ttobjs.h (TT_DefRecord): Add `inline_delta' member.
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FT_F26Dot6 compensation,
FT_Int resolution );
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/* Point displacement along the freedom vector routine */
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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 */
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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 */
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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 */
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typedef void
(*TT_Set_CVT_Func)( EXEC_OP_ FT_ULong idx,
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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;
[truetype] Support subpixel hinting. This is the large, famous `Infinality' patch to support ClearType bytecode which has been available from http://www.infinality.net/blog/ for some time, and which has been refined over the last years. While still experimental, it is now mature enough to be included directly into FreeType. Most of the code is based on the ClearType whitepaper written by Greg Hitchcock http://www.microsoft.com/typography/cleartype/truetypecleartype.aspx which gives a detailed overview of the necessary changes to the Microsoft rasterizer so that older fonts are supported. However, a lot of details are still missing, and this patches provides a framework to easily handle rendering issues down to the glyph level of certain fonts. Note that ClearType support is not completely implemented! In particular, full support for the options `compatible_widths', `symmetrical_smoothing, and `bgr' (via the GETINFO bytecode instruction) is missing. * src/truetype/ttsubpix.c: New file, providing code to handle `tweaks', this is, rules for certain glyphs in certain fonts (including wildcards) which need a special treatment. * src/truetype/ttsubpix.h: New file, holding the tweaking rules. * include/freetype/config/ftoption.h, src/devel/ftoption.h (TT_CONFIG_OPTION_SUBPIXEL_HINTING): New macro. * include/freetype/internal/ftobjs.h (FT_PIX_FLOOR_GRID, FT_PIX_ROUND_GRID, FT_PIX_CEIL_GRID): New macros. * src/truetype/truetype.c [TT_USE_BYTECODE_INTERPRETER]: Include `ttsubpix.c'. * src/truetype/ttgload.c: Include `ttsubpix.h'. [All changes below are guarded by TT_CONFIG_OPTION_SUBPIXEL_HINTING.] (tt_get_metrics): Set tweak flags. (TT_Hint_Glyph): Call `FT_Outline_EmboldenXY' if necessary. (TT_Process_Simple_Glyph): Compensate emboldening if necessary. (compute_glyph_metrics): Handle `compatible widths' option. (tt_loader_init): Handle ClearType GETINFO information bits. * src/truetype/rules.mk (TT_DRC_SRC): Updated. * src/truetype/ttinterp.c: Include `ttsubpix.h'. [Where necessary, changes below are guarded by TT_CONFIG_OPTION_SUBPIXEL_HINTING.] (Direct_Move, Direct_Move_X): Extended. (Round_None, Round_To_Grid, Round_To_Half_Grid, Round_Down_To_Grid, Round_Up_To_Grid, Round_To_Double_Grid, Round_Super, Round_Super_45, SetSuperRound): Add parameter to handle the number of grid lines per pixel. (SET_SuperRound, ROUND_None, CUR_Func_round): Updated. (DO_SROUND, DOS45ROUND, DO_ODD, DO_EVEN): Updated. (DO_ROUND, DO_NROUND): Updated. (DO_RS): Take care of `Typeman' bytecode patterns. (Ins_FDEF): Add some debugging code. Commented out. (Ins_ENDF): Restore state. (Ins_CALL, Ins_LOOPCALL): Handle inline delta functions. (Ins_MD): Handle `Vacuform' rounds. (Move_Zp2_Point, Ins_SHPIX, Ins_MSIRP, Ins_MDAP, Ins_MIAP, Ins_MDRP, Ins_MIRP): Handle tweaks. (Ins_ALIGNRP): Add tweak guard. (Ins_IUP, Ins_DELTAP): Handle tweaks. (Ins_GETINFO): Handle new ClearType bits. (TT_RunIns): Handle tweaks. * src/truetype/ttinterp.h: Updated. (SPH_TweakRule, SPH_ScaleRule): New structures for tweaks. (TT_ExecContextRec): Add members for subpixel hinting support. * src/truetype/ttobjs.h (TT_DefRecord): Add `inline_delta' member.
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#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 MAX_NAME_SIZE 32
#define MAX_CLASS_MEMBERS 100
typedef struct SPH_TweakRule_
{
const char family[MAX_NAME_SIZE];
const FT_UInt ppem;
const char style[MAX_NAME_SIZE];
const FT_ULong glyph;
} SPH_TweakRule;
typedef struct SPH_ScaleRule_
{
const char family[MAX_NAME_SIZE];
const FT_UInt ppem;
const char style[MAX_NAME_SIZE];
const FT_ULong glyph;
const FT_ULong scale;
} SPH_ScaleRule;
typedef struct Font_Class_
{
const char name[MAX_NAME_SIZE];
const char member[MAX_CLASS_MEMBERS][MAX_NAME_SIZE];
} Font_Class;
#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 */
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 */
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 */
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#endif
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 */
FT_Long F_dot_P; /* dot product of freedom and projection */
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/* 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 */
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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) */
FT_Bool grayscale; /* are we hinting for grayscale? */
[truetype] Support subpixel hinting. This is the large, famous `Infinality' patch to support ClearType bytecode which has been available from http://www.infinality.net/blog/ for some time, and which has been refined over the last years. While still experimental, it is now mature enough to be included directly into FreeType. Most of the code is based on the ClearType whitepaper written by Greg Hitchcock http://www.microsoft.com/typography/cleartype/truetypecleartype.aspx which gives a detailed overview of the necessary changes to the Microsoft rasterizer so that older fonts are supported. However, a lot of details are still missing, and this patches provides a framework to easily handle rendering issues down to the glyph level of certain fonts. Note that ClearType support is not completely implemented! In particular, full support for the options `compatible_widths', `symmetrical_smoothing, and `bgr' (via the GETINFO bytecode instruction) is missing. * src/truetype/ttsubpix.c: New file, providing code to handle `tweaks', this is, rules for certain glyphs in certain fonts (including wildcards) which need a special treatment. * src/truetype/ttsubpix.h: New file, holding the tweaking rules. * include/freetype/config/ftoption.h, src/devel/ftoption.h (TT_CONFIG_OPTION_SUBPIXEL_HINTING): New macro. * include/freetype/internal/ftobjs.h (FT_PIX_FLOOR_GRID, FT_PIX_ROUND_GRID, FT_PIX_CEIL_GRID): New macros. * src/truetype/truetype.c [TT_USE_BYTECODE_INTERPRETER]: Include `ttsubpix.c'. * src/truetype/ttgload.c: Include `ttsubpix.h'. [All changes below are guarded by TT_CONFIG_OPTION_SUBPIXEL_HINTING.] (tt_get_metrics): Set tweak flags. (TT_Hint_Glyph): Call `FT_Outline_EmboldenXY' if necessary. (TT_Process_Simple_Glyph): Compensate emboldening if necessary. (compute_glyph_metrics): Handle `compatible widths' option. (tt_loader_init): Handle ClearType GETINFO information bits. * src/truetype/rules.mk (TT_DRC_SRC): Updated. * src/truetype/ttinterp.c: Include `ttsubpix.h'. [Where necessary, changes below are guarded by TT_CONFIG_OPTION_SUBPIXEL_HINTING.] (Direct_Move, Direct_Move_X): Extended. (Round_None, Round_To_Grid, Round_To_Half_Grid, Round_Down_To_Grid, Round_Up_To_Grid, Round_To_Double_Grid, Round_Super, Round_Super_45, SetSuperRound): Add parameter to handle the number of grid lines per pixel. (SET_SuperRound, ROUND_None, CUR_Func_round): Updated. (DO_SROUND, DOS45ROUND, DO_ODD, DO_EVEN): Updated. (DO_ROUND, DO_NROUND): Updated. (DO_RS): Take care of `Typeman' bytecode patterns. (Ins_FDEF): Add some debugging code. Commented out. (Ins_ENDF): Restore state. (Ins_CALL, Ins_LOOPCALL): Handle inline delta functions. (Ins_MD): Handle `Vacuform' rounds. (Move_Zp2_Point, Ins_SHPIX, Ins_MSIRP, Ins_MDAP, Ins_MIAP, Ins_MDRP, Ins_MIRP): Handle tweaks. (Ins_ALIGNRP): Add tweak guard. (Ins_IUP, Ins_DELTAP): Handle tweaks. (Ins_GETINFO): Handle new ClearType bits. (TT_RunIns): Handle tweaks. * src/truetype/ttinterp.h: Updated. (SPH_TweakRule, SPH_ScaleRule): New structures for tweaks. (TT_ExecContextRec): Add members for subpixel hinting support. * src/truetype/ttobjs.h (TT_DefRecord): Add `inline_delta' member.
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#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
TT_Round_Func func_round_sphn; /* subpixel rounding function */
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 ) */
FT_Bool compatibility_mode;/* Additional exceptions to */
/* native TT rules for legacy */
/* fonts. Implies */
/* ignore_x_mode. */
/* 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)? */
FT_Int rasterizer_version; /* MS rasterizer version */
FT_Bool iup_called; /* IUP called for glyph? */
FT_Bool in_delta_function; /* inside an inline delta */
/* function? */
FT_ULong sph_tweak_flags; /* flags to control */
/* hint tweaks */
FT_Int num_delta_funcs;
FT_ULong inline_delta_funcs[5];
#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */
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} TT_ExecContextRec;
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,
FT_Int range,
FT_Long IP );
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FT_LOCAL( FT_Error )
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TT_Set_CodeRange( TT_ExecContext exec,
FT_Int range,
void* base,
FT_Long length );
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FT_LOCAL( FT_Error )
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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 );
/*************************************************************************/
/* */
/* <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. */
/* */
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FT_EXPORT( TT_ExecContext )
TT_New_Context( TT_Driver driver );
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,
TT_Face face,
TT_Size size );
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FT_LOCAL( FT_Error )
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TT_Save_Context( TT_ExecContext exec,
TT_Size ins );
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FT_LOCAL( FT_Error )
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TT_Run_Context( TT_ExecContext exec,
FT_Bool debug );
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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. */
/* */
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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 */