Edit
kc3-lang/freetype/src/truetype/ttinterp.h
Werner Lemberg
- src/truetype/ttinterp.h
-
/***************************************************************************/ /* */ /* ttinterp.h */ /* */ /* TrueType bytecode interpreter (specification). */ /* */ /* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007 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_Long 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 ); /*************************************************************************/ /* */ /* <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 */