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| 1 /***************************************************************************/ | |
| 2 /* */ | |
| 3 /* ttinterp.h */ | |
| 4 /* */ | |
| 5 /* TrueType bytecode interpreter (specification). */ | |
| 6 /* */ | |
| 7 /* Copyright 1996-2007, 2010, 2012-2013 by */ | |
| 8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ | |
| 9 /* */ | |
| 10 /* This file is part of the FreeType project, and may only be used, */ | |
| 11 /* modified, and distributed under the terms of the FreeType project */ | |
| 12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ | |
| 13 /* this file you indicate that you have read the license and */ | |
| 14 /* understand and accept it fully. */ | |
| 15 /* */ | |
| 16 /***************************************************************************/ | |
| 17 | |
| 18 | |
| 19 #ifndef __TTINTERP_H__ | |
| 20 #define __TTINTERP_H__ | |
| 21 | |
| 22 #include "../../include/ft2build.h" | |
| 23 #include "ttobjs.h" | |
| 24 | |
| 25 | |
| 26 FT_BEGIN_HEADER | |
| 27 | |
| 28 | |
| 29 #ifndef TT_CONFIG_OPTION_STATIC_INTERPRETER /* indirect implementation */ | |
| 30 | |
| 31 #define EXEC_OP_ TT_ExecContext exc, | |
| 32 #define EXEC_OP TT_ExecContext exc | |
| 33 #define EXEC_ARG_ exc, | |
| 34 #define EXEC_ARG exc | |
| 35 | |
| 36 #else /* static implementation */ | |
| 37 | |
| 38 #define EXEC_OP_ /* void */ | |
| 39 #define EXEC_OP /* void */ | |
| 40 #define EXEC_ARG_ /* void */ | |
| 41 #define EXEC_ARG /* void */ | |
| 42 | |
| 43 #endif /* TT_CONFIG_OPTION_STATIC_INTERPRETER */ | |
| 44 | |
| 45 | |
| 46 /*************************************************************************/ | |
| 47 /* */ | |
| 48 /* Rounding mode constants. */ | |
| 49 /* */ | |
| 50 #define TT_Round_Off 5 | |
| 51 #define TT_Round_To_Half_Grid 0 | |
| 52 #define TT_Round_To_Grid 1 | |
| 53 #define TT_Round_To_Double_Grid 2 | |
| 54 #define TT_Round_Up_To_Grid 4 | |
| 55 #define TT_Round_Down_To_Grid 3 | |
| 56 #define TT_Round_Super 6 | |
| 57 #define TT_Round_Super_45 7 | |
| 58 | |
| 59 | |
| 60 /*************************************************************************/ | |
| 61 /* */ | |
| 62 /* Function types used by the interpreter, depending on various modes */ | |
| 63 /* (e.g. the rounding mode, whether to render a vertical or horizontal */ | |
| 64 /* line etc). */ | |
| 65 /* */ | |
| 66 /*************************************************************************/ | |
| 67 | |
| 68 /* Rounding function */ | |
| 69 typedef FT_F26Dot6 | |
| 70 (*TT_Round_Func)( EXEC_OP_ FT_F26Dot6 distance, | |
| 71 FT_F26Dot6 compensation ); | |
| 72 | |
| 73 /* Point displacement along the freedom vector routine */ | |
| 74 typedef void | |
| 75 (*TT_Move_Func)( EXEC_OP_ TT_GlyphZone zone, | |
| 76 FT_UShort point, | |
| 77 FT_F26Dot6 distance ); | |
| 78 | |
| 79 /* Distance projection along one of the projection vectors */ | |
| 80 typedef FT_F26Dot6 | |
| 81 (*TT_Project_Func)( EXEC_OP_ FT_Pos dx, | |
| 82 FT_Pos dy ); | |
| 83 | |
| 84 /* reading a cvt value. Take care of non-square pixels if necessary */ | |
| 85 typedef FT_F26Dot6 | |
| 86 (*TT_Get_CVT_Func)( EXEC_OP_ FT_ULong idx ); | |
| 87 | |
| 88 /* setting or moving a cvt value. Take care of non-square pixels */ | |
| 89 /* if necessary */ | |
| 90 typedef void | |
| 91 (*TT_Set_CVT_Func)( EXEC_OP_ FT_ULong idx, | |
| 92 FT_F26Dot6 value ); | |
| 93 | |
| 94 | |
| 95 /*************************************************************************/ | |
| 96 /* */ | |
| 97 /* This structure defines a call record, used to manage function calls. */ | |
| 98 /* */ | |
| 99 typedef struct TT_CallRec_ | |
| 100 { | |
| 101 FT_Int Caller_Range; | |
| 102 FT_Long Caller_IP; | |
| 103 FT_Long Cur_Count; | |
| 104 FT_Long Cur_Restart; | |
| 105 FT_Long Cur_End; | |
| 106 | |
| 107 } TT_CallRec, *TT_CallStack; | |
| 108 | |
| 109 | |
| 110 #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING | |
| 111 | |
| 112 /*************************************************************************/ | |
| 113 /* */ | |
| 114 /* These structures define rules used to tweak subpixel hinting for */ | |
| 115 /* various fonts. "", 0, "", NULL value indicates to match any value. */ | |
| 116 /* */ | |
| 117 | |
| 118 #define SPH_MAX_NAME_SIZE 32 | |
| 119 #define SPH_MAX_CLASS_MEMBERS 100 | |
| 120 | |
| 121 typedef struct SPH_TweakRule_ | |
| 122 { | |
| 123 const char family[SPH_MAX_NAME_SIZE]; | |
| 124 const FT_UInt ppem; | |
| 125 const char style[SPH_MAX_NAME_SIZE]; | |
| 126 const FT_ULong glyph; | |
| 127 | |
| 128 } SPH_TweakRule; | |
| 129 | |
| 130 | |
| 131 typedef struct SPH_ScaleRule_ | |
| 132 { | |
| 133 const char family[SPH_MAX_NAME_SIZE]; | |
| 134 const FT_UInt ppem; | |
| 135 const char style[SPH_MAX_NAME_SIZE]; | |
| 136 const FT_ULong glyph; | |
| 137 const FT_ULong scale; | |
| 138 | |
| 139 } SPH_ScaleRule; | |
| 140 | |
| 141 | |
| 142 typedef struct SPH_Font_Class_ | |
| 143 { | |
| 144 const char name[SPH_MAX_NAME_SIZE]; | |
| 145 const char member[SPH_MAX_CLASS_MEMBERS][SPH_MAX_NAME_SIZE]; | |
| 146 | |
| 147 } SPH_Font_Class; | |
| 148 | |
| 149 #endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */ | |
| 150 | |
| 151 | |
| 152 /*************************************************************************/ | |
| 153 /* */ | |
| 154 /* The main structure for the interpreter which collects all necessary */ | |
| 155 /* variables and states. */ | |
| 156 /* */ | |
| 157 typedef struct TT_ExecContextRec_ | |
| 158 { | |
| 159 TT_Face face; | |
| 160 TT_Size size; | |
| 161 FT_Memory memory; | |
| 162 | |
| 163 /* instructions state */ | |
| 164 | |
| 165 FT_Error error; /* last execution error */ | |
| 166 | |
| 167 FT_Long top; /* top of exec. stack */ | |
| 168 | |
| 169 FT_UInt stackSize; /* size of exec. stack */ | |
| 170 FT_Long* stack; /* current exec. stack */ | |
| 171 | |
| 172 FT_Long args; | |
| 173 FT_UInt new_top; /* new top after exec. */ | |
| 174 | |
| 175 TT_GlyphZoneRec zp0, /* zone records */ | |
| 176 zp1, | |
| 177 zp2, | |
| 178 pts, | |
| 179 twilight; | |
| 180 | |
| 181 FT_Size_Metrics metrics; | |
| 182 TT_Size_Metrics tt_metrics; /* size metrics */ | |
| 183 | |
| 184 TT_GraphicsState GS; /* current graphics state */ | |
| 185 | |
| 186 FT_Int curRange; /* current code range number */ | |
| 187 FT_Byte* code; /* current code range */ | |
| 188 FT_Long IP; /* current instruction pointer */ | |
| 189 FT_Long codeSize; /* size of current range */ | |
| 190 | |
| 191 FT_Byte opcode; /* current opcode */ | |
| 192 FT_Int length; /* length of current opcode */ | |
| 193 | |
| 194 FT_Bool step_ins; /* true if the interpreter must */ | |
| 195 /* increment IP after ins. exec */ | |
| 196 FT_ULong cvtSize; | |
| 197 FT_Long* cvt; | |
| 198 | |
| 199 FT_UInt glyphSize; /* glyph instructions buffer size */ | |
| 200 FT_Byte* glyphIns; /* glyph instructions buffer */ | |
| 201 | |
| 202 FT_UInt numFDefs; /* number of function defs */ | |
| 203 FT_UInt maxFDefs; /* maximum number of function defs */ | |
| 204 TT_DefArray FDefs; /* table of FDefs entries */ | |
| 205 | |
| 206 FT_UInt numIDefs; /* number of instruction defs */ | |
| 207 FT_UInt maxIDefs; /* maximum number of ins defs */ | |
| 208 TT_DefArray IDefs; /* table of IDefs entries */ | |
| 209 | |
| 210 FT_UInt maxFunc; /* maximum function index */ | |
| 211 FT_UInt maxIns; /* maximum instruction index */ | |
| 212 | |
| 213 FT_Int callTop, /* top of call stack during execution */ | |
| 214 callSize; /* size of call stack */ | |
| 215 TT_CallStack callStack; /* call stack */ | |
| 216 | |
| 217 FT_UShort maxPoints; /* capacity of this context's `pts' */ | |
| 218 FT_Short maxContours; /* record, expressed in points and */ | |
| 219 /* contours. */ | |
| 220 | |
| 221 TT_CodeRangeTable codeRangeTable; /* table of valid code ranges */ | |
| 222 /* useful for the debugger */ | |
| 223 | |
| 224 FT_UShort storeSize; /* size of current storage */ | |
| 225 FT_Long* storage; /* storage area */ | |
| 226 | |
| 227 FT_F26Dot6 period; /* values used for the */ | |
| 228 FT_F26Dot6 phase; /* `SuperRounding' */ | |
| 229 FT_F26Dot6 threshold; | |
| 230 | |
| 231 #if 0 | |
| 232 /* this seems to be unused */ | |
| 233 FT_Int cur_ppem; /* ppem along the current proj vector */ | |
| 234 #endif | |
| 235 | |
| 236 FT_Bool instruction_trap; /* If `True', the interpreter will */ | |
| 237 /* exit after each instruction */ | |
| 238 | |
| 239 TT_GraphicsState default_GS; /* graphics state resulting from */ | |
| 240 /* the prep program */ | |
| 241 FT_Bool is_composite; /* true if the glyph is composite */ | |
| 242 FT_Bool pedantic_hinting; /* true if pedantic interpretation */ | |
| 243 | |
| 244 /* latest interpreter additions */ | |
| 245 | |
| 246 FT_Long F_dot_P; /* dot product of freedom and projection */ | |
| 247 /* vectors */ | |
| 248 TT_Round_Func func_round; /* current rounding function */ | |
| 249 | |
| 250 TT_Project_Func func_project, /* current projection function */ | |
| 251 func_dualproj, /* current dual proj. function */ | |
| 252 func_freeProj; /* current freedom proj. func */ | |
| 253 | |
| 254 TT_Move_Func func_move; /* current point move function */ | |
| 255 TT_Move_Func func_move_orig; /* move original position function */ | |
| 256 | |
| 257 TT_Get_CVT_Func func_read_cvt; /* read a cvt entry */ | |
| 258 TT_Set_CVT_Func func_write_cvt; /* write a cvt entry (in pixels) */ | |
| 259 TT_Set_CVT_Func func_move_cvt; /* incr a cvt entry (in pixels) */ | |
| 260 | |
| 261 FT_Bool grayscale; /* are we hinting for grayscale? */ | |
| 262 | |
| 263 #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING | |
| 264 TT_Round_Func func_round_sphn; /* subpixel rounding function */ | |
| 265 | |
| 266 FT_Bool grayscale_hinting; /* Using grayscale hinting? */ | |
| 267 FT_Bool subpixel_hinting; /* Using subpixel hinting? */ | |
| 268 FT_Bool native_hinting; /* Using native hinting? */ | |
| 269 FT_Bool ignore_x_mode; /* Standard rendering mode for */ | |
| 270 /* subpixel hinting. On if gray */ | |
| 271 /* or subpixel hinting is on ) */ | |
| 272 | |
| 273 /* The following 4 aren't fully implemented but here for MS rasterizer */ | |
| 274 /* compatibility. */ | |
| 275 FT_Bool compatible_widths; /* compatible widths? */ | |
| 276 FT_Bool symmetrical_smoothing; /* symmetrical_smoothing? */ | |
| 277 FT_Bool bgr; /* bgr instead of rgb? */ | |
| 278 FT_Bool subpixel_positioned; /* subpixel positioned */ | |
| 279 /* (DirectWrite ClearType)? */ | |
| 280 | |
| 281 FT_Int rasterizer_version; /* MS rasterizer version */ | |
| 282 | |
| 283 FT_Bool iup_called; /* IUP called for glyph? */ | |
| 284 | |
| 285 FT_ULong sph_tweak_flags; /* flags to control */ | |
| 286 /* hint tweaks */ | |
| 287 | |
| 288 FT_ULong sph_in_func_flags; /* flags to indicate if in */ | |
| 289 /* special functions */ | |
| 290 | |
| 291 #endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */ | |
| 292 | |
| 293 } TT_ExecContextRec; | |
| 294 | |
| 295 | |
| 296 extern const TT_GraphicsState tt_default_graphics_state; | |
| 297 | |
| 298 | |
| 299 #ifdef TT_USE_BYTECODE_INTERPRETER | |
| 300 FT_LOCAL( FT_Error ) | |
| 301 TT_Goto_CodeRange( TT_ExecContext exec, | |
| 302 FT_Int range, | |
| 303 FT_Long IP ); | |
| 304 | |
| 305 FT_LOCAL( FT_Error ) | |
| 306 TT_Set_CodeRange( TT_ExecContext exec, | |
| 307 FT_Int range, | |
| 308 void* base, | |
| 309 FT_Long length ); | |
| 310 | |
| 311 FT_LOCAL( FT_Error ) | |
| 312 TT_Clear_CodeRange( TT_ExecContext exec, | |
| 313 FT_Int range ); | |
| 314 | |
| 315 | |
| 316 FT_LOCAL( FT_Error ) | |
| 317 Update_Max( FT_Memory memory, | |
| 318 FT_ULong* size, | |
| 319 FT_Long multiplier, | |
| 320 void* _pbuff, | |
| 321 FT_ULong new_max ); | |
| 322 #endif /* TT_USE_BYTECODE_INTERPRETER */ | |
| 323 | |
| 324 | |
| 325 /*************************************************************************/ | |
| 326 /* */ | |
| 327 /* <Function> */ | |
| 328 /* TT_New_Context */ | |
| 329 /* */ | |
| 330 /* <Description> */ | |
| 331 /* Queries the face context for a given font. Note that there is */ | |
| 332 /* now a _single_ execution context in the TrueType driver which is */ | |
| 333 /* shared among faces. */ | |
| 334 /* */ | |
| 335 /* <Input> */ | |
| 336 /* face :: A handle to the source face object. */ | |
| 337 /* */ | |
| 338 /* <Return> */ | |
| 339 /* A handle to the execution context. Initialized for `face'. */ | |
| 340 /* */ | |
| 341 /* <Note> */ | |
| 342 /* Only the glyph loader and debugger should call this function. */ | |
| 343 /* */ | |
| 344 FT_EXPORT( TT_ExecContext ) | |
| 345 TT_New_Context( TT_Driver driver ); | |
| 346 | |
| 347 | |
| 348 #ifdef TT_USE_BYTECODE_INTERPRETER | |
| 349 FT_LOCAL( FT_Error ) | |
| 350 TT_Done_Context( TT_ExecContext exec ); | |
| 351 | |
| 352 FT_LOCAL( FT_Error ) | |
| 353 TT_Load_Context( TT_ExecContext exec, | |
| 354 TT_Face face, | |
| 355 TT_Size size ); | |
| 356 | |
| 357 FT_LOCAL( FT_Error ) | |
| 358 TT_Save_Context( TT_ExecContext exec, | |
| 359 TT_Size ins ); | |
| 360 | |
| 361 FT_LOCAL( FT_Error ) | |
| 362 TT_Run_Context( TT_ExecContext exec, | |
| 363 FT_Bool debug ); | |
| 364 #endif /* TT_USE_BYTECODE_INTERPRETER */ | |
| 365 | |
| 366 | |
| 367 /*************************************************************************/ | |
| 368 /* */ | |
| 369 /* <Function> */ | |
| 370 /* TT_RunIns */ | |
| 371 /* */ | |
| 372 /* <Description> */ | |
| 373 /* Executes one or more instruction in the execution context. This */ | |
| 374 /* is the main function of the TrueType opcode interpreter. */ | |
| 375 /* */ | |
| 376 /* <Input> */ | |
| 377 /* exec :: A handle to the target execution context. */ | |
| 378 /* */ | |
| 379 /* <Return> */ | |
| 380 /* FreeType error code. 0 means success. */ | |
| 381 /* */ | |
| 382 /* <Note> */ | |
| 383 /* Only the object manager and debugger should call this function. */ | |
| 384 /* */ | |
| 385 /* This function is publicly exported because it is directly */ | |
| 386 /* invoked by the TrueType debugger. */ | |
| 387 /* */ | |
| 388 FT_EXPORT( FT_Error ) | |
| 389 TT_RunIns( TT_ExecContext exec ); | |
| 390 | |
| 391 | |
| 392 FT_END_HEADER | |
| 393 | |
| 394 #endif /* __TTINTERP_H__ */ | |
| 395 | |
| 396 | |
| 397 /* END */ | |
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Chromium Code Reviews
Issue 815103002:
Update freetype to 2.5.4. (Closed)
Base URL: https://pdfium.googlesource.com/pdfium.git@master