kc3-lang/freetype/src/truetype/ttinterp.h
-
Show log
Commit
-
Hash : 08fdac98
Author :
Date : 2000-02-21T16:01:33
fixed a bug in the glyph loader that caused a memory block to be freed twice. Also performed changes to use the new glyph zone object that has appeared in ftobjs.h
-
src/truetype/ttinterp.h
-
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470
/***************************************************************************/ /* */ /* ttinterp.h */ /* */ /* TrueType bytecode intepreter (specification). */ /* */ /* Copyright 1996-1999 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 <ttobjs.h> #ifdef __cplusplus extern "C" { #endif #ifndef TT_STATIC_INTEPRETER /* 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_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 TT_F26Dot6 (*TT_Round_Func)( EXEC_OP_ TT_F26Dot6 distance, TT_F26Dot6 compensation ); /* Point displacement along the freedom vector routine */ typedef void (*TT_Move_Func)( EXEC_OP_ FT_GlyphZone* zone, TT_UInt point, TT_F26Dot6 distance ); /* Distance projection along one of the projection vectors */ typedef TT_F26Dot6 (*TT_Project_Func)( EXEC_OP_ TT_Vector* v1, TT_Vector* v2 ); /* reading a cvt value. Take care of non-square pixels if necessary */ typedef TT_F26Dot6 (*TT_Get_CVT_Func)( EXEC_OP_ TT_ULong index ); /* setting or moving a cvt value. Take care of non-square pixels */ /* if necessary */ typedef void (*TT_Set_CVT_Func)( EXEC_OP_ TT_ULong index, TT_F26Dot6 value ); /*************************************************************************/ /* */ /* This structure defines a call record, used to manage function calls. */ /* */ typedef struct TT_CallRec_ { TT_Int Caller_Range; TT_Long Caller_IP; TT_Long Cur_Count; TT_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 */ TT_Error error; /* last execution error */ TT_Long top; /* top of exec. stack */ TT_UInt stackSize; /* size of exec. stack */ TT_Long* stack; /* current exec. stack */ TT_Long args; TT_UInt new_top; /* new top after exec. */ FT_GlyphZone zp0, /* zone records */ zp1, zp2, pts, twilight; FT_Size_Metrics metrics; TT_Size_Metrics tt_metrics; /* size metrics */ TT_GraphicsState GS; /* current graphics state */ TT_Int curRange; /* current code range number */ TT_Byte* code; /* current code range */ TT_Long IP; /* current instruction pointer */ TT_Long codeSize; /* size of current range */ TT_Byte opcode; /* current opcode */ TT_Int length; /* length of current opcode */ TT_Bool step_ins; /* true if the interpreter must */ /* increment IP after ins. exec */ TT_Long cvtSize; TT_Long* cvt; TT_UInt glyphSize; /* glyph instructions buffer size */ TT_Byte* glyphIns; /* glyph instructions buffer */ TT_UInt numFDefs; /* number of function defs */ TT_UInt maxFDefs; /* maximum number of function defs */ TT_DefArray FDefs; /* table of FDefs entries */ TT_UInt numIDefs; /* number of instruction defs */ TT_UInt maxIDefs; /* maximum number of ins defs */ TT_DefArray IDefs; /* table of IDefs entries */ TT_UInt maxFunc; /* maximum function index */ TT_UInt maxIns; /* maximum instruction index */ TT_Int callTop, /* top of call stack during execution */ callSize; /* size of call stack */ TT_CallStack callStack; /* call stack */ TT_UShort maxPoints; /* capacity of this context's `pts' */ TT_Short maxContours; /* record, expressed in points and */ /* contours. */ TT_CodeRangeTable codeRangeTable; /* table of valid code ranges */ /* useful for the debugger */ TT_UShort storeSize; /* size of current storage */ TT_Long* storage; /* storage area */ TT_F26Dot6 period; /* values used for the */ TT_F26Dot6 phase; /* `SuperRounding' */ TT_F26Dot6 threshold; /* this seems to be unused */ #if 0 TT_Int cur_ppem; /* ppem along the current proj vector */ #endif TT_Bool instruction_trap; /* If `True', the interpreter will */ /* exit after each instruction */ TT_GraphicsState default_GS; /* graphics state resulting from */ /* the prep program */ TT_Bool is_composite; /* true if the glyph is composite */ TT_Bool pedantic_hinting; /* true for pedantic interpretation */ /* latest interpreter additions */ TT_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_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) */ TT_ULong loadSize; TT_SubGlyph_Stack loadStack; /* loading subglyph stack */ } TT_ExecContextRec; LOCAL_DEF const TT_GraphicsState tt_default_graphics_state; /*************************************************************************/ /* */ /* <Function> */ /* TT_Goto_CodeRange */ /* */ /* <Description> */ /* Switches to a new code range (updates the code related elements in */ /* `exec', and `IP'). */ /* */ /* <Input> */ /* range :: The new execution code range. */ /* IP :: The new IP in the new code range. */ /* */ /* <InOut> */ /* exec :: The target execution context. */ /* */ /* <Return> */ /* TrueType error code. 0 means success. */ /* */ LOCAL_DEF TT_Error TT_Goto_CodeRange( TT_ExecContext exec, TT_Int range, TT_Long IP ); /*************************************************************************/ /* */ /* <Function> */ /* TT_Set_CodeRange */ /* */ /* <Description> */ /* Sets a code range. */ /* */ /* <Input> */ /* range :: The code range index. */ /* base :: The new code base. */ /* length :: The range size in bytes. */ /* */ /* <InOut> */ /* exec :: The target execution context. */ /* */ /* <Return> */ /* TrueType error code. 0 means success. */ /* */ LOCAL_DEF TT_Error TT_Set_CodeRange( TT_ExecContext exec, TT_Int range, void* base, TT_Long length ); /*************************************************************************/ /* */ /* <Function> */ /* TT_Clear_CodeRange */ /* */ /* <Description> */ /* Clears a code range. */ /* */ /* <Input> */ /* range :: The code range index. */ /* */ /* <InOut> */ /* exec :: The target execution context. */ /* */ /* <Return> */ /* TrueType error code. 0 means success. */ /* */ /* <Note> */ /* Does not set the Error variable. */ /* */ LOCAL_DEF TT_Error TT_Clear_CodeRange( TT_ExecContext exec, TT_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. */ /* */ EXPORT_DEF TT_ExecContext TT_New_Context( TT_Face face ); /*************************************************************************/ /* */ /* <Function> */ /* TT_Done_Context */ /* */ /* <Description> */ /* Discards an execution context. */ /* */ /* <Input> */ /* exec :: A handle to the target execution context. */ /* */ /* <Return> */ /* TrueType error code. 0 means success. */ /* */ /* <Note> */ /* Only the glyph loader and debugger should call this function. */ /* */ EXPORT_DEF TT_Error TT_Done_Context( TT_ExecContext exec ); /*************************************************************************/ /* */ /* <Function> */ /* TT_Destroy_Context */ /* */ /* <Description> */ /* Destroys a given context. */ /* */ /* <Input> */ /* exec :: A handle to the target execution context. */ /* memory :: A handle to the parent memory object. */ /* */ /* <Return> */ /* TrueType error code. 0 means success. */ /* */ /* <Note> */ /* Only the glyph loader and debugger should call this function. */ /* */ LOCAL_DEF TT_Error TT_Destroy_Context( TT_ExecContext exec, FT_Memory memory ); /*************************************************************************/ /* */ /* <Function> */ /* TT_Load_Context */ /* */ /* <Description> */ /* Prepare an execution context for glyph hinting. */ /* */ /* <Input> */ /* exec :: A handle to the target execution context. */ /* face :: A handle to the source face object. */ /* size :: A handle to the source size object. */ /* */ /* <Return> */ /* TrueType error code. 0 means success. */ /* */ /* <Note> */ /* Only the glyph loader and debugger should call this function. */ /* */ EXPORT_DEF TT_Error TT_Load_Context( TT_ExecContext exec, TT_Face face, TT_Size size ); /*************************************************************************/ /* */ /* <Function> */ /* TT_Save_Context */ /* */ /* <Description> */ /* Saves the code ranges in a `size' object. */ /* */ /* <Input> */ /* exec :: A handle to the source execution context. */ /* */ /* <Output> */ /* ins :: A handle to the target size object. */ /* */ /* <Return> */ /* TrueType error code. 0 means success. */ /* */ /* <Note> */ /* Only the glyph loader and debugger should call this function. */ /* */ LOCAL_DEF TT_Error TT_Save_Context( TT_ExecContext exec, TT_Size ins ); /*************************************************************************/ /* */ /* <Function> */ /* TT_Run_Context */ /* */ /* <Description> */ /* Executes one or more instructions in the execution context. */ /* */ /* <Input> */ /* exec :: A handle to the target execution context. */ /* */ /* debug :: A Boolean flag. If set, the function sets some internal */ /* variables and returns immediately, otherwise TT_RunIns() */ /* is called. */ /* */ /* <Return> */ /* TrueTyoe error code. 0 means success. */ /* */ /* <Note> */ /* Only the glyph loader and debugger should call this function. */ /* */ LOCAL_DEF TT_Error TT_Run_Context( TT_ExecContext exec, TT_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> */ /* TrueType error code. 0 means success. */ /* */ /* <Note> */ /* Only object manager and debugger should call this function. */ /* */ EXPORT_DEF TT_Error TT_RunIns( TT_ExecContext exec ); #ifdef __cplusplus } #endif #endif /* TTINTERP_H */ /* END */