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ttinterp.h
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00001 /***************************************************************************/ 00002 /* */ 00003 /* ttinterp.h */ 00004 /* */ 00005 /* TrueType bytecode interpreter (specification). */ 00006 /* */ 00007 /* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2010 by */ 00008 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ 00009 /* */ 00010 /* This file is part of the FreeType project, and may only be used, */ 00011 /* modified, and distributed under the terms of the FreeType project */ 00012 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 00013 /* this file you indicate that you have read the license and */ 00014 /* understand and accept it fully. */ 00015 /* */ 00016 /***************************************************************************/ 00017 00018 00019 #ifndef __TTINTERP_H__ 00020 #define __TTINTERP_H__ 00021 00022 #include <ft2build.h> 00023 #include "ttobjs.h" 00024 00025 00026 FT_BEGIN_HEADER 00027 00028 00029 #ifndef TT_CONFIG_OPTION_STATIC_INTERPRETER /* indirect implementation */ 00030 00031 #define EXEC_OP_ TT_ExecContext exc, 00032 #define EXEC_OP TT_ExecContext exc 00033 #define EXEC_ARG_ exc, 00034 #define EXEC_ARG exc 00035 00036 #else /* static implementation */ 00037 00038 #define EXEC_OP_ /* void */ 00039 #define EXEC_OP /* void */ 00040 #define EXEC_ARG_ /* void */ 00041 #define EXEC_ARG /* void */ 00042 00043 #endif /* TT_CONFIG_OPTION_STATIC_INTERPRETER */ 00044 00045 00046 /*************************************************************************/ 00047 /* */ 00048 /* Rounding mode constants. */ 00049 /* */ 00050 #define TT_Round_Off 5 00051 #define TT_Round_To_Half_Grid 0 00052 #define TT_Round_To_Grid 1 00053 #define TT_Round_To_Double_Grid 2 00054 #define TT_Round_Up_To_Grid 4 00055 #define TT_Round_Down_To_Grid 3 00056 #define TT_Round_Super 6 00057 #define TT_Round_Super_45 7 00058 00059 00060 /*************************************************************************/ 00061 /* */ 00062 /* Function types used by the interpreter, depending on various modes */ 00063 /* (e.g. the rounding mode, whether to render a vertical or horizontal */ 00064 /* line etc). */ 00065 /* */ 00066 /*************************************************************************/ 00067 00068 /* Rounding function */ 00069 typedef FT_F26Dot6 00070 (*TT_Round_Func)( EXEC_OP_ FT_F26Dot6 distance, 00071 FT_F26Dot6 compensation ); 00072 00073 /* Point displacement along the freedom vector routine */ 00074 typedef void 00075 (*TT_Move_Func)( EXEC_OP_ TT_GlyphZone zone, 00076 FT_UShort point, 00077 FT_F26Dot6 distance ); 00078 00079 /* Distance projection along one of the projection vectors */ 00080 typedef FT_F26Dot6 00081 (*TT_Project_Func)( EXEC_OP_ FT_Pos dx, 00082 FT_Pos dy ); 00083 00084 /* reading a cvt value. Take care of non-square pixels if necessary */ 00085 typedef FT_F26Dot6 00086 (*TT_Get_CVT_Func)( EXEC_OP_ FT_ULong idx ); 00087 00088 /* setting or moving a cvt value. Take care of non-square pixels */ 00089 /* if necessary */ 00090 typedef void 00091 (*TT_Set_CVT_Func)( EXEC_OP_ FT_ULong idx, 00092 FT_F26Dot6 value ); 00093 00094 00095 /*************************************************************************/ 00096 /* */ 00097 /* This structure defines a call record, used to manage function calls. */ 00098 /* */ 00099 typedef struct TT_CallRec_ 00100 { 00101 FT_Int Caller_Range; 00102 FT_Long Caller_IP; 00103 FT_Long Cur_Count; 00104 FT_Long Cur_Restart; 00105 00106 } TT_CallRec, *TT_CallStack; 00107 00108 00109 /*************************************************************************/ 00110 /* */ 00111 /* The main structure for the interpreter which collects all necessary */ 00112 /* variables and states. */ 00113 /* */ 00114 typedef struct TT_ExecContextRec_ 00115 { 00116 TT_Face face; 00117 TT_Size size; 00118 FT_Memory memory; 00119 00120 /* instructions state */ 00121 00122 FT_Error error; /* last execution error */ 00123 00124 FT_Long top; /* top of exec. stack */ 00125 00126 FT_UInt stackSize; /* size of exec. stack */ 00127 FT_Long* stack; /* current exec. stack */ 00128 00129 FT_Long args; 00130 FT_UInt new_top; /* new top after exec. */ 00131 00132 TT_GlyphZoneRec zp0, /* zone records */ 00133 zp1, 00134 zp2, 00135 pts, 00136 twilight; 00137 00138 FT_Size_Metrics metrics; 00139 TT_Size_Metrics tt_metrics; /* size metrics */ 00140 00141 TT_GraphicsState GS; /* current graphics state */ 00142 00143 FT_Int curRange; /* current code range number */ 00144 FT_Byte* code; /* current code range */ 00145 FT_Long IP; /* current instruction pointer */ 00146 FT_Long codeSize; /* size of current range */ 00147 00148 FT_Byte opcode; /* current opcode */ 00149 FT_Int length; /* length of current opcode */ 00150 00151 FT_Bool step_ins; /* true if the interpreter must */ 00152 /* increment IP after ins. exec */ 00153 FT_ULong cvtSize; 00154 FT_Long* cvt; 00155 00156 FT_UInt glyphSize; /* glyph instructions buffer size */ 00157 FT_Byte* glyphIns; /* glyph instructions buffer */ 00158 00159 FT_UInt numFDefs; /* number of function defs */ 00160 FT_UInt maxFDefs; /* maximum number of function defs */ 00161 TT_DefArray FDefs; /* table of FDefs entries */ 00162 00163 FT_UInt numIDefs; /* number of instruction defs */ 00164 FT_UInt maxIDefs; /* maximum number of ins defs */ 00165 TT_DefArray IDefs; /* table of IDefs entries */ 00166 00167 FT_UInt maxFunc; /* maximum function index */ 00168 FT_UInt maxIns; /* maximum instruction index */ 00169 00170 FT_Int callTop, /* top of call stack during execution */ 00171 callSize; /* size of call stack */ 00172 TT_CallStack callStack; /* call stack */ 00173 00174 FT_UShort maxPoints; /* capacity of this context's `pts' */ 00175 FT_Short maxContours; /* record, expressed in points and */ 00176 /* contours. */ 00177 00178 TT_CodeRangeTable codeRangeTable; /* table of valid code ranges */ 00179 /* useful for the debugger */ 00180 00181 FT_UShort storeSize; /* size of current storage */ 00182 FT_Long* storage; /* storage area */ 00183 00184 FT_F26Dot6 period; /* values used for the */ 00185 FT_F26Dot6 phase; /* `SuperRounding' */ 00186 FT_F26Dot6 threshold; 00187 00188 #if 0 00189 /* this seems to be unused */ 00190 FT_Int cur_ppem; /* ppem along the current proj vector */ 00191 #endif 00192 00193 FT_Bool instruction_trap; /* If `True', the interpreter will */ 00194 /* exit after each instruction */ 00195 00196 TT_GraphicsState default_GS; /* graphics state resulting from */ 00197 /* the prep program */ 00198 FT_Bool is_composite; /* true if the glyph is composite */ 00199 FT_Bool pedantic_hinting; /* true if pedantic interpretation */ 00200 00201 /* latest interpreter additions */ 00202 00203 FT_Long F_dot_P; /* dot product of freedom and projection */ 00204 /* vectors */ 00205 TT_Round_Func func_round; /* current rounding function */ 00206 00207 TT_Project_Func func_project, /* current projection function */ 00208 func_dualproj, /* current dual proj. function */ 00209 func_freeProj; /* current freedom proj. func */ 00210 00211 TT_Move_Func func_move; /* current point move function */ 00212 TT_Move_Func func_move_orig; /* move original position function */ 00213 00214 TT_Get_CVT_Func func_read_cvt; /* read a cvt entry */ 00215 TT_Set_CVT_Func func_write_cvt; /* write a cvt entry (in pixels) */ 00216 TT_Set_CVT_Func func_move_cvt; /* incr a cvt entry (in pixels) */ 00217 00218 FT_Bool grayscale; /* are we hinting for grayscale? */ 00219 00220 } TT_ExecContextRec; 00221 00222 00223 extern const TT_GraphicsState tt_default_graphics_state; 00224 00225 00226 FT_LOCAL( FT_Error ) 00227 TT_Goto_CodeRange( TT_ExecContext exec, 00228 FT_Int range, 00229 FT_Long IP ); 00230 00231 FT_LOCAL( FT_Error ) 00232 TT_Set_CodeRange( TT_ExecContext exec, 00233 FT_Int range, 00234 void* base, 00235 FT_Long length ); 00236 00237 FT_LOCAL( FT_Error ) 00238 TT_Clear_CodeRange( TT_ExecContext exec, 00239 FT_Int range ); 00240 00241 00242 FT_LOCAL( FT_Error ) 00243 Update_Max( FT_Memory memory, 00244 FT_ULong* size, 00245 FT_Long multiplier, 00246 void* _pbuff, 00247 FT_ULong new_max ); 00248 00249 00250 /*************************************************************************/ 00251 /* */ 00252 /* <Function> */ 00253 /* TT_New_Context */ 00254 /* */ 00255 /* <Description> */ 00256 /* Queries the face context for a given font. Note that there is */ 00257 /* now a _single_ execution context in the TrueType driver which is */ 00258 /* shared among faces. */ 00259 /* */ 00260 /* <Input> */ 00261 /* face :: A handle to the source face object. */ 00262 /* */ 00263 /* <Return> */ 00264 /* A handle to the execution context. Initialized for `face'. */ 00265 /* */ 00266 /* <Note> */ 00267 /* Only the glyph loader and debugger should call this function. */ 00268 /* */ 00269 FT_EXPORT( TT_ExecContext ) 00270 TT_New_Context( TT_Driver driver ); 00271 00272 FT_LOCAL( FT_Error ) 00273 TT_Done_Context( TT_ExecContext exec ); 00274 00275 FT_LOCAL( FT_Error ) 00276 TT_Load_Context( TT_ExecContext exec, 00277 TT_Face face, 00278 TT_Size size ); 00279 00280 FT_LOCAL( FT_Error ) 00281 TT_Save_Context( TT_ExecContext exec, 00282 TT_Size ins ); 00283 00284 FT_LOCAL( FT_Error ) 00285 TT_Run_Context( TT_ExecContext exec, 00286 FT_Bool debug ); 00287 00288 00289 /*************************************************************************/ 00290 /* */ 00291 /* <Function> */ 00292 /* TT_RunIns */ 00293 /* */ 00294 /* <Description> */ 00295 /* Executes one or more instruction in the execution context. This */ 00296 /* is the main function of the TrueType opcode interpreter. */ 00297 /* */ 00298 /* <Input> */ 00299 /* exec :: A handle to the target execution context. */ 00300 /* */ 00301 /* <Return> */ 00302 /* FreeType error code. 0 means success. */ 00303 /* */ 00304 /* <Note> */ 00305 /* Only the object manager and debugger should call this function. */ 00306 /* */ 00307 /* This function is publicly exported because it is directly */ 00308 /* invoked by the TrueType debugger. */ 00309 /* */ 00310 FT_EXPORT( FT_Error ) 00311 TT_RunIns( TT_ExecContext exec ); 00312 00313 00314 FT_END_HEADER 00315 00316 #endif /* __TTINTERP_H__ */ 00317 00318 00319 /* END */
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