1 /**************************************************************************** 2 * 3 * tttables.h 4 * 5 * Basic SFNT/TrueType tables definitions and interface 6 * (specification only). 7 * 8 * Copyright (C) 1996-2019 by 9 * David Turner, Robert Wilhelm, and Werner Lemberg. 10 * 11 * This file is part of the FreeType project, and may only be used, 12 * modified, and distributed under the terms of the FreeType project 13 * license, LICENSE.TXT. By continuing to use, modify, or distribute 14 * this file you indicate that you have read the license and 15 * understand and accept it fully. 16 * 17 */ 18 19 20 #ifndef TTTABLES_H_ 21 #define TTTABLES_H_ 22 23 24 #include <ft2build.h> 25 #include FT_FREETYPE_H 26 27 #ifdef FREETYPE_H 28 #error "freetype.h of FreeType 1 has been loaded!" 29 #error "Please fix the directory search order for header files" 30 #error "so that freetype.h of FreeType 2 is found first." 31 #endif 32 33 34 FT_BEGIN_HEADER 35 36 /************************************************************************** 37 * 38 * @section: 39 * truetype_tables 40 * 41 * @title: 42 * TrueType Tables 43 * 44 * @abstract: 45 * TrueType-specific table types and functions. 46 * 47 * @description: 48 * This section contains definitions of some basic tables specific to 49 * TrueType and OpenType as well as some routines used to access and 50 * process them. 51 * 52 * @order: 53 * TT_Header 54 * TT_HoriHeader 55 * TT_VertHeader 56 * TT_OS2 57 * TT_Postscript 58 * TT_PCLT 59 * TT_MaxProfile 60 * 61 * FT_Sfnt_Tag 62 * FT_Get_Sfnt_Table 63 * FT_Load_Sfnt_Table 64 * FT_Sfnt_Table_Info 65 * 66 * FT_Get_CMap_Language_ID 67 * FT_Get_CMap_Format 68 * 69 * FT_PARAM_TAG_UNPATENTED_HINTING 70 * 71 */ 72 73 74 /************************************************************************** 75 * 76 * @struct: 77 * TT_Header 78 * 79 * @description: 80 * A structure to model a TrueType font header table. All fields follow 81 * the OpenType specification. The 64-bit timestamps are stored in 82 * two-element arrays `Created` and `Modified`, first the upper then 83 * the lower 32~bits. 84 */ 85 typedef struct TT_Header_ 86 { 87 FT_Fixed Table_Version; 88 FT_Fixed Font_Revision; 89 90 FT_Long CheckSum_Adjust; 91 FT_Long Magic_Number; 92 93 FT_UShort Flags; 94 FT_UShort Units_Per_EM; 95 96 FT_ULong Created [2]; 97 FT_ULong Modified[2]; 98 99 FT_Short xMin; 100 FT_Short yMin; 101 FT_Short xMax; 102 FT_Short yMax; 103 104 FT_UShort Mac_Style; 105 FT_UShort Lowest_Rec_PPEM; 106 107 FT_Short Font_Direction; 108 FT_Short Index_To_Loc_Format; 109 FT_Short Glyph_Data_Format; 110 111 } TT_Header; 112 113 114 /************************************************************************** 115 * 116 * @struct: 117 * TT_HoriHeader 118 * 119 * @description: 120 * A structure to model a TrueType horizontal header, the 'hhea' table, 121 * as well as the corresponding horizontal metrics table, 'hmtx'. 122 * 123 * @fields: 124 * Version :: 125 * The table version. 126 * 127 * Ascender :: 128 * The font's ascender, i.e., the distance from the baseline to the 129 * top-most of all glyph points found in the font. 130 * 131 * This value is invalid in many fonts, as it is usually set by the 132 * font designer, and often reflects only a portion of the glyphs found 133 * in the font (maybe ASCII). 134 * 135 * You should use the `sTypoAscender` field of the 'OS/2' table instead 136 * if you want the correct one. 137 * 138 * Descender :: 139 * The font's descender, i.e., the distance from the baseline to the 140 * bottom-most of all glyph points found in the font. It is negative. 141 * 142 * This value is invalid in many fonts, as it is usually set by the 143 * font designer, and often reflects only a portion of the glyphs found 144 * in the font (maybe ASCII). 145 * 146 * You should use the `sTypoDescender` field of the 'OS/2' table 147 * instead if you want the correct one. 148 * 149 * Line_Gap :: 150 * The font's line gap, i.e., the distance to add to the ascender and 151 * descender to get the BTB, i.e., the baseline-to-baseline distance 152 * for the font. 153 * 154 * advance_Width_Max :: 155 * This field is the maximum of all advance widths found in the font. 156 * It can be used to compute the maximum width of an arbitrary string 157 * of text. 158 * 159 * min_Left_Side_Bearing :: 160 * The minimum left side bearing of all glyphs within the font. 161 * 162 * min_Right_Side_Bearing :: 163 * The minimum right side bearing of all glyphs within the font. 164 * 165 * xMax_Extent :: 166 * The maximum horizontal extent (i.e., the 'width' of a glyph's 167 * bounding box) for all glyphs in the font. 168 * 169 * caret_Slope_Rise :: 170 * The rise coefficient of the cursor's slope of the cursor 171 * (slope=rise/run). 172 * 173 * caret_Slope_Run :: 174 * The run coefficient of the cursor's slope. 175 * 176 * caret_Offset :: 177 * The cursor's offset for slanted fonts. 178 * 179 * Reserved :: 180 * 8~reserved bytes. 181 * 182 * metric_Data_Format :: 183 * Always~0. 184 * 185 * number_Of_HMetrics :: 186 * Number of HMetrics entries in the 'hmtx' table -- this value can be 187 * smaller than the total number of glyphs in the font. 188 * 189 * long_metrics :: 190 * A pointer into the 'hmtx' table. 191 * 192 * short_metrics :: 193 * A pointer into the 'hmtx' table. 194 * 195 * @note: 196 * For an OpenType variation font, the values of the following fields can 197 * change after a call to @FT_Set_Var_Design_Coordinates (and friends) if 198 * the font contains an 'MVAR' table: `caret_Slope_Rise`, 199 * `caret_Slope_Run`, and `caret_Offset`. 200 */ 201 typedef struct TT_HoriHeader_ 202 { 203 FT_Fixed Version; 204 FT_Short Ascender; 205 FT_Short Descender; 206 FT_Short Line_Gap; 207 208 FT_UShort advance_Width_Max; /* advance width maximum */ 209 210 FT_Short min_Left_Side_Bearing; /* minimum left-sb */ 211 FT_Short min_Right_Side_Bearing; /* minimum right-sb */ 212 FT_Short xMax_Extent; /* xmax extents */ 213 FT_Short caret_Slope_Rise; 214 FT_Short caret_Slope_Run; 215 FT_Short caret_Offset; 216 217 FT_Short Reserved[4]; 218 219 FT_Short metric_Data_Format; 220 FT_UShort number_Of_HMetrics; 221 222 /* The following fields are not defined by the OpenType specification */ 223 /* but they are used to connect the metrics header to the relevant */ 224 /* 'hmtx' table. */ 225 226 void* long_metrics; 227 void* short_metrics; 228 229 } TT_HoriHeader; 230 231 232 /************************************************************************** 233 * 234 * @struct: 235 * TT_VertHeader 236 * 237 * @description: 238 * A structure used to model a TrueType vertical header, the 'vhea' 239 * table, as well as the corresponding vertical metrics table, 'vmtx'. 240 * 241 * @fields: 242 * Version :: 243 * The table version. 244 * 245 * Ascender :: 246 * The font's ascender, i.e., the distance from the baseline to the 247 * top-most of all glyph points found in the font. 248 * 249 * This value is invalid in many fonts, as it is usually set by the 250 * font designer, and often reflects only a portion of the glyphs found 251 * in the font (maybe ASCII). 252 * 253 * You should use the `sTypoAscender` field of the 'OS/2' table instead 254 * if you want the correct one. 255 * 256 * Descender :: 257 * The font's descender, i.e., the distance from the baseline to the 258 * bottom-most of all glyph points found in the font. It is negative. 259 * 260 * This value is invalid in many fonts, as it is usually set by the 261 * font designer, and often reflects only a portion of the glyphs found 262 * in the font (maybe ASCII). 263 * 264 * You should use the `sTypoDescender` field of the 'OS/2' table 265 * instead if you want the correct one. 266 * 267 * Line_Gap :: 268 * The font's line gap, i.e., the distance to add to the ascender and 269 * descender to get the BTB, i.e., the baseline-to-baseline distance 270 * for the font. 271 * 272 * advance_Height_Max :: 273 * This field is the maximum of all advance heights found in the font. 274 * It can be used to compute the maximum height of an arbitrary string 275 * of text. 276 * 277 * min_Top_Side_Bearing :: 278 * The minimum top side bearing of all glyphs within the font. 279 * 280 * min_Bottom_Side_Bearing :: 281 * The minimum bottom side bearing of all glyphs within the font. 282 * 283 * yMax_Extent :: 284 * The maximum vertical extent (i.e., the 'height' of a glyph's 285 * bounding box) for all glyphs in the font. 286 * 287 * caret_Slope_Rise :: 288 * The rise coefficient of the cursor's slope of the cursor 289 * (slope=rise/run). 290 * 291 * caret_Slope_Run :: 292 * The run coefficient of the cursor's slope. 293 * 294 * caret_Offset :: 295 * The cursor's offset for slanted fonts. 296 * 297 * Reserved :: 298 * 8~reserved bytes. 299 * 300 * metric_Data_Format :: 301 * Always~0. 302 * 303 * number_Of_VMetrics :: 304 * Number of VMetrics entries in the 'vmtx' table -- this value can be 305 * smaller than the total number of glyphs in the font. 306 * 307 * long_metrics :: 308 * A pointer into the 'vmtx' table. 309 * 310 * short_metrics :: 311 * A pointer into the 'vmtx' table. 312 * 313 * @note: 314 * For an OpenType variation font, the values of the following fields can 315 * change after a call to @FT_Set_Var_Design_Coordinates (and friends) if 316 * the font contains an 'MVAR' table: `Ascender`, `Descender`, 317 * `Line_Gap`, `caret_Slope_Rise`, `caret_Slope_Run`, and `caret_Offset`. 318 */ 319 typedef struct TT_VertHeader_ 320 { 321 FT_Fixed Version; 322 FT_Short Ascender; 323 FT_Short Descender; 324 FT_Short Line_Gap; 325 326 FT_UShort advance_Height_Max; /* advance height maximum */ 327 328 FT_Short min_Top_Side_Bearing; /* minimum top-sb */ 329 FT_Short min_Bottom_Side_Bearing; /* minimum bottom-sb */ 330 FT_Short yMax_Extent; /* ymax extents */ 331 FT_Short caret_Slope_Rise; 332 FT_Short caret_Slope_Run; 333 FT_Short caret_Offset; 334 335 FT_Short Reserved[4]; 336 337 FT_Short metric_Data_Format; 338 FT_UShort number_Of_VMetrics; 339 340 /* The following fields are not defined by the OpenType specification */ 341 /* but they are used to connect the metrics header to the relevant */ 342 /* 'vmtx' table. */ 343 344 void* long_metrics; 345 void* short_metrics; 346 347 } TT_VertHeader; 348 349 350 /************************************************************************** 351 * 352 * @struct: 353 * TT_OS2 354 * 355 * @description: 356 * A structure to model a TrueType 'OS/2' table. All fields comply to 357 * the OpenType specification. 358 * 359 * Note that we now support old Mac fonts that do not include an 'OS/2' 360 * table. In this case, the `version` field is always set to 0xFFFF. 361 * 362 * @note: 363 * For an OpenType variation font, the values of the following fields can 364 * change after a call to @FT_Set_Var_Design_Coordinates (and friends) if 365 * the font contains an 'MVAR' table: `sCapHeight`, `sTypoAscender`, 366 * `sTypoDescender`, `sTypoLineGap`, `sxHeight`, `usWinAscent`, 367 * `usWinDescent`, `yStrikeoutPosition`, `yStrikeoutSize`, 368 * `ySubscriptXOffset`, `ySubScriptXSize`, `ySubscriptYOffset`, 369 * `ySubscriptYSize`, `ySuperscriptXOffset`, `ySuperscriptXSize`, 370 * `ySuperscriptYOffset`, and `ySuperscriptYSize`. 371 * 372 * Possible values for bits in the `ulUnicodeRangeX` fields are given by 373 * the @TT_UCR_XXX macros. 374 */ 375 376 typedef struct TT_OS2_ 377 { 378 FT_UShort version; /* 0x0001 - more or 0xFFFF */ 379 FT_Short xAvgCharWidth; 380 FT_UShort usWeightClass; 381 FT_UShort usWidthClass; 382 FT_UShort fsType; 383 FT_Short ySubscriptXSize; 384 FT_Short ySubscriptYSize; 385 FT_Short ySubscriptXOffset; 386 FT_Short ySubscriptYOffset; 387 FT_Short ySuperscriptXSize; 388 FT_Short ySuperscriptYSize; 389 FT_Short ySuperscriptXOffset; 390 FT_Short ySuperscriptYOffset; 391 FT_Short yStrikeoutSize; 392 FT_Short yStrikeoutPosition; 393 FT_Short sFamilyClass; 394 395 FT_Byte panose[10]; 396 397 FT_ULong ulUnicodeRange1; /* Bits 0-31 */ 398 FT_ULong ulUnicodeRange2; /* Bits 32-63 */ 399 FT_ULong ulUnicodeRange3; /* Bits 64-95 */ 400 FT_ULong ulUnicodeRange4; /* Bits 96-127 */ 401 402 FT_Char achVendID[4]; 403 404 FT_UShort fsSelection; 405 FT_UShort usFirstCharIndex; 406 FT_UShort usLastCharIndex; 407 FT_Short sTypoAscender; 408 FT_Short sTypoDescender; 409 FT_Short sTypoLineGap; 410 FT_UShort usWinAscent; 411 FT_UShort usWinDescent; 412 413 /* only version 1 and higher: */ 414 415 FT_ULong ulCodePageRange1; /* Bits 0-31 */ 416 FT_ULong ulCodePageRange2; /* Bits 32-63 */ 417 418 /* only version 2 and higher: */ 419 420 FT_Short sxHeight; 421 FT_Short sCapHeight; 422 FT_UShort usDefaultChar; 423 FT_UShort usBreakChar; 424 FT_UShort usMaxContext; 425 426 /* only version 5 and higher: */ 427 428 FT_UShort usLowerOpticalPointSize; /* in twips (1/20th points) */ 429 FT_UShort usUpperOpticalPointSize; /* in twips (1/20th points) */ 430 431 } TT_OS2; 432 433 434 /************************************************************************** 435 * 436 * @struct: 437 * TT_Postscript 438 * 439 * @description: 440 * A structure to model a TrueType 'post' table. All fields comply to 441 * the OpenType specification. This structure does not reference a 442 * font's PostScript glyph names; use @FT_Get_Glyph_Name to retrieve 443 * them. 444 * 445 * @note: 446 * For an OpenType variation font, the values of the following fields can 447 * change after a call to @FT_Set_Var_Design_Coordinates (and friends) if 448 * the font contains an 'MVAR' table: `underlinePosition` and 449 * `underlineThickness`. 450 */ 451 typedef struct TT_Postscript_ 452 { 453 FT_Fixed FormatType; 454 FT_Fixed italicAngle; 455 FT_Short underlinePosition; 456 FT_Short underlineThickness; 457 FT_ULong isFixedPitch; 458 FT_ULong minMemType42; 459 FT_ULong maxMemType42; 460 FT_ULong minMemType1; 461 FT_ULong maxMemType1; 462 463 /* Glyph names follow in the 'post' table, but we don't */ 464 /* load them by default. */ 465 466 } TT_Postscript; 467 468 469 /************************************************************************** 470 * 471 * @struct: 472 * TT_PCLT 473 * 474 * @description: 475 * A structure to model a TrueType 'PCLT' table. All fields comply to 476 * the OpenType specification. 477 */ 478 typedef struct TT_PCLT_ 479 { 480 FT_Fixed Version; 481 FT_ULong FontNumber; 482 FT_UShort Pitch; 483 FT_UShort xHeight; 484 FT_UShort Style; 485 FT_UShort TypeFamily; 486 FT_UShort CapHeight; 487 FT_UShort SymbolSet; 488 FT_Char TypeFace[16]; 489 FT_Char CharacterComplement[8]; 490 FT_Char FileName[6]; 491 FT_Char StrokeWeight; 492 FT_Char WidthType; 493 FT_Byte SerifStyle; 494 FT_Byte Reserved; 495 496 } TT_PCLT; 497 498 499 /************************************************************************** 500 * 501 * @struct: 502 * TT_MaxProfile 503 * 504 * @description: 505 * The maximum profile ('maxp') table contains many max values, which can 506 * be used to pre-allocate arrays for speeding up glyph loading and 507 * hinting. 508 * 509 * @fields: 510 * version :: 511 * The version number. 512 * 513 * numGlyphs :: 514 * The number of glyphs in this TrueType font. 515 * 516 * maxPoints :: 517 * The maximum number of points in a non-composite TrueType glyph. See 518 * also `maxCompositePoints`. 519 * 520 * maxContours :: 521 * The maximum number of contours in a non-composite TrueType glyph. 522 * See also `maxCompositeContours`. 523 * 524 * maxCompositePoints :: 525 * The maximum number of points in a composite TrueType glyph. See 526 * also `maxPoints`. 527 * 528 * maxCompositeContours :: 529 * The maximum number of contours in a composite TrueType glyph. See 530 * also `maxContours`. 531 * 532 * maxZones :: 533 * The maximum number of zones used for glyph hinting. 534 * 535 * maxTwilightPoints :: 536 * The maximum number of points in the twilight zone used for glyph 537 * hinting. 538 * 539 * maxStorage :: 540 * The maximum number of elements in the storage area used for glyph 541 * hinting. 542 * 543 * maxFunctionDefs :: 544 * The maximum number of function definitions in the TrueType bytecode 545 * for this font. 546 * 547 * maxInstructionDefs :: 548 * The maximum number of instruction definitions in the TrueType 549 * bytecode for this font. 550 * 551 * maxStackElements :: 552 * The maximum number of stack elements used during bytecode 553 * interpretation. 554 * 555 * maxSizeOfInstructions :: 556 * The maximum number of TrueType opcodes used for glyph hinting. 557 * 558 * maxComponentElements :: 559 * The maximum number of simple (i.e., non-composite) glyphs in a 560 * composite glyph. 561 * 562 * maxComponentDepth :: 563 * The maximum nesting depth of composite glyphs. 564 * 565 * @note: 566 * This structure is only used during font loading. 567 */ 568 typedef struct TT_MaxProfile_ 569 { 570 FT_Fixed version; 571 FT_UShort numGlyphs; 572 FT_UShort maxPoints; 573 FT_UShort maxContours; 574 FT_UShort maxCompositePoints; 575 FT_UShort maxCompositeContours; 576 FT_UShort maxZones; 577 FT_UShort maxTwilightPoints; 578 FT_UShort maxStorage; 579 FT_UShort maxFunctionDefs; 580 FT_UShort maxInstructionDefs; 581 FT_UShort maxStackElements; 582 FT_UShort maxSizeOfInstructions; 583 FT_UShort maxComponentElements; 584 FT_UShort maxComponentDepth; 585 586 } TT_MaxProfile; 587 588 589 /************************************************************************** 590 * 591 * @enum: 592 * FT_Sfnt_Tag 593 * 594 * @description: 595 * An enumeration to specify indices of SFNT tables loaded and parsed by 596 * FreeType during initialization of an SFNT font. Used in the 597 * @FT_Get_Sfnt_Table API function. 598 * 599 * @values: 600 * FT_SFNT_HEAD :: 601 * To access the font's @TT_Header structure. 602 * 603 * FT_SFNT_MAXP :: 604 * To access the font's @TT_MaxProfile structure. 605 * 606 * FT_SFNT_OS2 :: 607 * To access the font's @TT_OS2 structure. 608 * 609 * FT_SFNT_HHEA :: 610 * To access the font's @TT_HoriHeader structure. 611 * 612 * FT_SFNT_VHEA :: 613 * To access the font's @TT_VertHeader structure. 614 * 615 * FT_SFNT_POST :: 616 * To access the font's @TT_Postscript structure. 617 * 618 * FT_SFNT_PCLT :: 619 * To access the font's @TT_PCLT structure. 620 */ 621 typedef enum FT_Sfnt_Tag_ 622 { 623 FT_SFNT_HEAD, 624 FT_SFNT_MAXP, 625 FT_SFNT_OS2, 626 FT_SFNT_HHEA, 627 FT_SFNT_VHEA, 628 FT_SFNT_POST, 629 FT_SFNT_PCLT, 630 631 FT_SFNT_MAX 632 633 } FT_Sfnt_Tag; 634 635 /* these constants are deprecated; use the corresponding `FT_Sfnt_Tag` */ 636 /* values instead */ 637 #define ft_sfnt_head FT_SFNT_HEAD 638 #define ft_sfnt_maxp FT_SFNT_MAXP 639 #define ft_sfnt_os2 FT_SFNT_OS2 640 #define ft_sfnt_hhea FT_SFNT_HHEA 641 #define ft_sfnt_vhea FT_SFNT_VHEA 642 #define ft_sfnt_post FT_SFNT_POST 643 #define ft_sfnt_pclt FT_SFNT_PCLT 644 645 646 /************************************************************************** 647 * 648 * @function: 649 * FT_Get_Sfnt_Table 650 * 651 * @description: 652 * Return a pointer to a given SFNT table stored within a face. 653 * 654 * @input: 655 * face :: 656 * A handle to the source. 657 * 658 * tag :: 659 * The index of the SFNT table. 660 * 661 * @return: 662 * A type-less pointer to the table. This will be `NULL` in case of 663 * error, or if the corresponding table was not found **OR** loaded from 664 * the file. 665 * 666 * Use a typecast according to `tag` to access the structure elements. 667 * 668 * @note: 669 * The table is owned by the face object and disappears with it. 670 * 671 * This function is only useful to access SFNT tables that are loaded by 672 * the sfnt, truetype, and opentype drivers. See @FT_Sfnt_Tag for a 673 * list. 674 * 675 * @example: 676 * Here is an example demonstrating access to the 'vhea' table. 677 * 678 * ``` 679 * TT_VertHeader* vert_header; 680 * 681 * 682 * vert_header = 683 * (TT_VertHeader*)FT_Get_Sfnt_Table( face, FT_SFNT_VHEA ); 684 * ``` 685 */ 686 FT_EXPORT( void* ) 687 FT_Get_Sfnt_Table( FT_Face face, 688 FT_Sfnt_Tag tag ); 689 690 691 /************************************************************************** 692 * 693 * @function: 694 * FT_Load_Sfnt_Table 695 * 696 * @description: 697 * Load any SFNT font table into client memory. 698 * 699 * @input: 700 * face :: 701 * A handle to the source face. 702 * 703 * tag :: 704 * The four-byte tag of the table to load. Use value~0 if you want to 705 * access the whole font file. Otherwise, you can use one of the 706 * definitions found in the @FT_TRUETYPE_TAGS_H file, or forge a new 707 * one with @FT_MAKE_TAG. 708 * 709 * offset :: 710 * The starting offset in the table (or file if tag~==~0). 711 * 712 * @output: 713 * buffer :: 714 * The target buffer address. The client must ensure that the memory 715 * array is big enough to hold the data. 716 * 717 * @inout: 718 * length :: 719 * If the `length` parameter is `NULL`, try to load the whole table. 720 * Return an error code if it fails. 721 * 722 * Else, if `*length` is~0, exit immediately while returning the 723 * table's (or file) full size in it. 724 * 725 * Else the number of bytes to read from the table or file, from the 726 * starting offset. 727 * 728 * @return: 729 * FreeType error code. 0~means success. 730 * 731 * @note: 732 * If you need to determine the table's length you should first call this 733 * function with `*length` set to~0, as in the following example: 734 * 735 * ``` 736 * FT_ULong length = 0; 737 * 738 * 739 * error = FT_Load_Sfnt_Table( face, tag, 0, NULL, &length ); 740 * if ( error ) { ... table does not exist ... } 741 * 742 * buffer = malloc( length ); 743 * if ( buffer == NULL ) { ... not enough memory ... } 744 * 745 * error = FT_Load_Sfnt_Table( face, tag, 0, buffer, &length ); 746 * if ( error ) { ... could not load table ... } 747 * ``` 748 * 749 * Note that structures like @TT_Header or @TT_OS2 can't be used with 750 * this function; they are limited to @FT_Get_Sfnt_Table. Reason is that 751 * those structures depend on the processor architecture, with varying 752 * size (e.g. 32bit vs. 64bit) or order (big endian vs. little endian). 753 * 754 */ 755 FT_EXPORT( FT_Error ) 756 FT_Load_Sfnt_Table( FT_Face face, 757 FT_ULong tag, 758 FT_Long offset, 759 FT_Byte* buffer, 760 FT_ULong* length ); 761 762 763 /************************************************************************** 764 * 765 * @function: 766 * FT_Sfnt_Table_Info 767 * 768 * @description: 769 * Return information on an SFNT table. 770 * 771 * @input: 772 * face :: 773 * A handle to the source face. 774 * 775 * table_index :: 776 * The index of an SFNT table. The function returns 777 * FT_Err_Table_Missing for an invalid value. 778 * 779 * @inout: 780 * tag :: 781 * The name tag of the SFNT table. If the value is `NULL`, 782 * `table_index` is ignored, and `length` returns the number of SFNT 783 * tables in the font. 784 * 785 * @output: 786 * length :: 787 * The length of the SFNT table (or the number of SFNT tables, 788 * depending on `tag`). 789 * 790 * @return: 791 * FreeType error code. 0~means success. 792 * 793 * @note: 794 * While parsing fonts, FreeType handles SFNT tables with length zero as 795 * missing. 796 * 797 */ 798 FT_EXPORT( FT_Error ) 799 FT_Sfnt_Table_Info( FT_Face face, 800 FT_UInt table_index, 801 FT_ULong *tag, 802 FT_ULong *length ); 803 804 805 /************************************************************************** 806 * 807 * @function: 808 * FT_Get_CMap_Language_ID 809 * 810 * @description: 811 * Return cmap language ID as specified in the OpenType standard. 812 * Definitions of language ID values are in file @FT_TRUETYPE_IDS_H. 813 * 814 * @input: 815 * charmap :: 816 * The target charmap. 817 * 818 * @return: 819 * The language ID of `charmap`. If `charmap` doesn't belong to an SFNT 820 * face, just return~0 as the default value. 821 * 822 * For a format~14 cmap (to access Unicode IVS), the return value is 823 * 0xFFFFFFFF. 824 */ 825 FT_EXPORT( FT_ULong ) 826 FT_Get_CMap_Language_ID( FT_CharMap charmap ); 827 828 829 /************************************************************************** 830 * 831 * @function: 832 * FT_Get_CMap_Format 833 * 834 * @description: 835 * Return the format of an SFNT 'cmap' table. 836 * 837 * @input: 838 * charmap :: 839 * The target charmap. 840 * 841 * @return: 842 * The format of `charmap`. If `charmap` doesn't belong to an SFNT face, 843 * return -1. 844 */ 845 FT_EXPORT( FT_Long ) 846 FT_Get_CMap_Format( FT_CharMap charmap ); 847 848 /* */ 849 850 851 FT_END_HEADER 852 853 #endif /* TTTABLES_H_ */ 854 855 856 /* END */ 857