--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libfreetype/src/truetype/ttinterp.h Mon Apr 25 01:46:54 2011 +0200
@@ -0,0 +1,319 @@
+/***************************************************************************/
+/* */
+/* ttinterp.h */
+/* */
+/* TrueType bytecode interpreter (specification). */
+/* */
+/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2010 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
+
+
+#ifndef TT_CONFIG_OPTION_STATIC_INTERPRETER /* 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_UShort point,
+ FT_F26Dot6 distance );
+
+ /* Distance projection along one of the projection vectors */
+ typedef FT_F26Dot6
+ (*TT_Project_Func)( EXEC_OP_ FT_Pos dx,
+ FT_Pos dy );
+
+ /* reading a cvt value. Take care of non-square pixels if necessary */
+ typedef FT_F26Dot6
+ (*TT_Get_CVT_Func)( EXEC_OP_ FT_ULong idx );
+
+ /* 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 );
+
+
+ /*************************************************************************/
+ /* */
+ /* 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_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;
+
+#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 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_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? */
+
+ } TT_ExecContextRec;
+
+
+ extern const TT_GraphicsState tt_default_graphics_state;
+
+
+ FT_LOCAL( FT_Error )
+ TT_Goto_CodeRange( TT_ExecContext exec,
+ FT_Int range,
+ FT_Long IP );
+
+ FT_LOCAL( FT_Error )
+ TT_Set_CodeRange( TT_ExecContext exec,
+ FT_Int range,
+ void* base,
+ FT_Long length );
+
+ FT_LOCAL( FT_Error )
+ TT_Clear_CodeRange( TT_ExecContext exec,
+ FT_Int range );
+
+
+ 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. */
+ /* */
+ FT_EXPORT( TT_ExecContext )
+ TT_New_Context( TT_Driver driver );
+
+ FT_LOCAL( FT_Error )
+ TT_Done_Context( TT_ExecContext exec );
+
+ FT_LOCAL( FT_Error )
+ TT_Load_Context( TT_ExecContext exec,
+ TT_Face face,
+ TT_Size size );
+
+ FT_LOCAL( FT_Error )
+ TT_Save_Context( TT_ExecContext exec,
+ TT_Size ins );
+
+ FT_LOCAL( FT_Error )
+ TT_Run_Context( TT_ExecContext exec,
+ FT_Bool debug );
+
+
+ /*************************************************************************/
+ /* */
+ /* <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 */