1 /**************************************************************************** 2 * 3 * tttables.h 4 * 5 * Basic SFNT/TrueType tables definitions and interface 6 * (specification only). 7 * 8 * Copyright 1996-2018 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 81 * follow the OpenType specification. 82 */ 83 typedef struct TT_Header_ 84 { 85 FT_Fixed Table_Version; 86 FT_Fixed Font_Revision; 87 88 FT_Long CheckSum_Adjust; 89 FT_Long Magic_Number; 90 91 FT_UShort Flags; 92 FT_UShort Units_Per_EM; 93 94 FT_Long Created [2]; 95 FT_Long Modified[2]; 96 97 FT_Short xMin; 98 FT_Short yMin; 99 FT_Short xMax; 100 FT_Short yMax; 101 102 FT_UShort Mac_Style; 103 FT_UShort Lowest_Rec_PPEM; 104 105 FT_Short Font_Direction; 106 FT_Short Index_To_Loc_Format; 107 FT_Short Glyph_Data_Format; 108 109 } TT_Header; 110 111 112 /************************************************************************** 113 * 114 * @struct: 115 * TT_HoriHeader 116 * 117 * @description: 118 * A structure to model a TrueType horizontal header, the `hhea' 119 * table, as well as the corresponding horizontal metrics table, 120 * `hmtx'. 121 * 122 * @fields: 123 * Version :: 124 * The table version. 125 * 126 * Ascender :: 127 * The font's ascender, i.e., the distance 128 * from the baseline to the top-most of all 129 * glyph points found in the font. 130 * 131 * This value is invalid in many fonts, as 132 * it is usually set by the font designer, 133 * and often reflects only a portion of the 134 * glyphs found in the font (maybe ASCII). 135 * 136 * You should use the `sTypoAscender' field 137 * of the `OS/2' table instead if you want 138 * the correct one. 139 * 140 * Descender :: 141 * The font's descender, i.e., the distance 142 * from the baseline to the bottom-most of 143 * all glyph points found in the font. It 144 * is negative. 145 * 146 * This value is invalid in many fonts, as 147 * it is usually set by the font designer, 148 * and often reflects only a portion of the 149 * glyphs found in the font (maybe ASCII). 150 * 151 * You should use the `sTypoDescender' 152 * field of the `OS/2' table instead if you 153 * want the correct one. 154 * 155 * Line_Gap :: 156 * The font's line gap, i.e., the distance 157 * to add to the ascender and descender to 158 * get the BTB, i.e., the 159 * baseline-to-baseline distance for the 160 * font. 161 * 162 * advance_Width_Max :: 163 * This field is the maximum of all advance 164 * widths found in the font. It can be 165 * used to compute the maximum width of an 166 * arbitrary string of text. 167 * 168 * min_Left_Side_Bearing :: 169 * The minimum left side bearing of all 170 * glyphs within the font. 171 * 172 * min_Right_Side_Bearing :: 173 * The minimum right side bearing of all 174 * glyphs within the font. 175 * 176 * xMax_Extent :: 177 * The maximum horizontal extent (i.e., the 178 * `width' of a glyph's bounding box) for 179 * all glyphs in the font. 180 * 181 * caret_Slope_Rise :: 182 * The rise coefficient of the cursor's 183 * slope of the cursor (slope=rise/run). 184 * 185 * caret_Slope_Run :: 186 * The run coefficient of the cursor's 187 * slope. 188 * 189 * caret_Offset :: 190 * The cursor's offset for slanted fonts. 191 * 192 * Reserved :: 193 * 8~reserved bytes. 194 * 195 * metric_Data_Format :: 196 * Always~0. 197 * 198 * number_Of_HMetrics :: 199 * Number of HMetrics entries in the `hmtx' 200 * table -- this value can be smaller than 201 * the total number of glyphs in the font. 202 * 203 * long_metrics :: 204 * A pointer into the `hmtx' table. 205 * 206 * short_metrics :: 207 * A pointer into the `hmtx' table. 208 * 209 * @note: 210 * For an OpenType variation font, the values of the following fields 211 * can change after a call to @FT_Set_Var_Design_Coordinates (and 212 * friends) if the font contains an `MVAR' table: `caret_Slope_Rise', 213 * `caret_Slope_Run', and `caret_Offset'. 214 */ 215 typedef struct TT_HoriHeader_ 216 { 217 FT_Fixed Version; 218 FT_Short Ascender; 219 FT_Short Descender; 220 FT_Short Line_Gap; 221 222 FT_UShort advance_Width_Max; /* advance width maximum */ 223 224 FT_Short min_Left_Side_Bearing; /* minimum left-sb */ 225 FT_Short min_Right_Side_Bearing; /* minimum right-sb */ 226 FT_Short xMax_Extent; /* xmax extents */ 227 FT_Short caret_Slope_Rise; 228 FT_Short caret_Slope_Run; 229 FT_Short caret_Offset; 230 231 FT_Short Reserved[4]; 232 233 FT_Short metric_Data_Format; 234 FT_UShort number_Of_HMetrics; 235 236 /* The following fields are not defined by the OpenType specification */ 237 /* but they are used to connect the metrics header to the relevant */ 238 /* `hmtx' table. */ 239 240 void* long_metrics; 241 void* short_metrics; 242 243 } TT_HoriHeader; 244 245 246 /************************************************************************** 247 * 248 * @struct: 249 * TT_VertHeader 250 * 251 * @description: 252 * A structure used to model a TrueType vertical header, the `vhea' 253 * table, as well as the corresponding vertical metrics table, 254 * `vmtx'. 255 * 256 * @fields: 257 * Version :: 258 * The table version. 259 * 260 * Ascender :: 261 * The font's ascender, i.e., the distance 262 * from the baseline to the top-most of 263 * all glyph points found in the font. 264 * 265 * This value is invalid in many fonts, as 266 * it is usually set by the font designer, 267 * and often reflects only a portion of 268 * the glyphs found in the font (maybe 269 * ASCII). 270 * 271 * You should use the `sTypoAscender' 272 * field of the `OS/2' table instead if 273 * you want the correct one. 274 * 275 * Descender :: 276 * The font's descender, i.e., the 277 * distance from the baseline to the 278 * bottom-most of all glyph points found 279 * in the font. It is negative. 280 * 281 * This value is invalid in many fonts, as 282 * it is usually set by the font designer, 283 * and often reflects only a portion of 284 * the glyphs found in the font (maybe 285 * ASCII). 286 * 287 * You should use the `sTypoDescender' 288 * field of the `OS/2' table instead if 289 * you want the correct one. 290 * 291 * Line_Gap :: 292 * The font's line gap, i.e., the distance 293 * to add to the ascender and descender to 294 * get the BTB, i.e., the 295 * baseline-to-baseline distance for the 296 * font. 297 * 298 * advance_Height_Max :: 299 * This field is the maximum of all 300 * advance heights found in the font. It 301 * can be used to compute the maximum 302 * height of an arbitrary string of text. 303 * 304 * min_Top_Side_Bearing :: 305 * The minimum top side bearing of all 306 * glyphs within the font. 307 * 308 * min_Bottom_Side_Bearing :: 309 * The minimum bottom side bearing of all 310 * glyphs within the font. 311 * 312 * yMax_Extent :: 313 * The maximum vertical extent (i.e., the 314 * `height' of a glyph's bounding box) for 315 * all glyphs in the font. 316 * 317 * caret_Slope_Rise :: 318 * The rise coefficient of the cursor's 319 * slope of the cursor (slope=rise/run). 320 * 321 * caret_Slope_Run :: 322 * The run coefficient of the cursor's 323 * slope. 324 * 325 * caret_Offset :: 326 * The cursor's offset for slanted fonts. 327 * 328 * Reserved :: 329 * 8~reserved bytes. 330 * 331 * metric_Data_Format :: 332 * Always~0. 333 * 334 * number_Of_VMetrics :: 335 * Number of VMetrics entries in the 336 * `vmtx' table -- this value can be 337 * smaller than the total number of glyphs 338 * in the font. 339 * 340 * long_metrics :: 341 * A pointer into the `vmtx' table. 342 * 343 * short_metrics :: 344 * A pointer into the `vmtx' table. 345 * 346 * @note: 347 * For an OpenType variation font, the values of the following fields 348 * can change after a call to @FT_Set_Var_Design_Coordinates (and 349 * friends) if the font contains an `MVAR' table: `Ascender', 350 * `Descender', `Line_Gap', `caret_Slope_Rise', `caret_Slope_Run', 351 * and `caret_Offset'. 352 */ 353 typedef struct TT_VertHeader_ 354 { 355 FT_Fixed Version; 356 FT_Short Ascender; 357 FT_Short Descender; 358 FT_Short Line_Gap; 359 360 FT_UShort advance_Height_Max; /* advance height maximum */ 361 362 FT_Short min_Top_Side_Bearing; /* minimum top-sb */ 363 FT_Short min_Bottom_Side_Bearing; /* minimum bottom-sb */ 364 FT_Short yMax_Extent; /* ymax extents */ 365 FT_Short caret_Slope_Rise; 366 FT_Short caret_Slope_Run; 367 FT_Short caret_Offset; 368 369 FT_Short Reserved[4]; 370 371 FT_Short metric_Data_Format; 372 FT_UShort number_Of_VMetrics; 373 374 /* The following fields are not defined by the OpenType specification */ 375 /* but they are used to connect the metrics header to the relevant */ 376 /* `vmtx' table. */ 377 378 void* long_metrics; 379 void* short_metrics; 380 381 } TT_VertHeader; 382 383 384 /************************************************************************** 385 * 386 * @struct: 387 * TT_OS2 388 * 389 * @description: 390 * A structure to model a TrueType `OS/2' table. All fields comply 391 * to the OpenType specification. 392 * 393 * Note that we now support old Mac fonts that do not include an 394 * `OS/2' table. In this case, the `version' field is always set to 395 * 0xFFFF. 396 * 397 * @note: 398 * For an OpenType variation font, the values of the following fields 399 * can change after a call to @FT_Set_Var_Design_Coordinates (and 400 * friends) if the font contains an `MVAR' table: `sCapHeight', 401 * `sTypoAscender', `sTypoDescender', `sTypoLineGap', `sxHeight', 402 * `usWinAscent', `usWinDescent', `yStrikeoutPosition', 403 * `yStrikeoutSize', `ySubscriptXOffset', `ySubScriptXSize', 404 * `ySubscriptYOffset', `ySubscriptYSize', `ySuperscriptXOffset', 405 * `ySuperscriptXSize', `ySuperscriptYOffset', and 406 * `ySuperscriptYSize'. 407 * 408 * Possible values for bits in the `ulUnicodeRangeX' fields are given 409 * by the @TT_UCR_XXX macros. 410 */ 411 412 typedef struct TT_OS2_ 413 { 414 FT_UShort version; /* 0x0001 - more or 0xFFFF */ 415 FT_Short xAvgCharWidth; 416 FT_UShort usWeightClass; 417 FT_UShort usWidthClass; 418 FT_UShort fsType; 419 FT_Short ySubscriptXSize; 420 FT_Short ySubscriptYSize; 421 FT_Short ySubscriptXOffset; 422 FT_Short ySubscriptYOffset; 423 FT_Short ySuperscriptXSize; 424 FT_Short ySuperscriptYSize; 425 FT_Short ySuperscriptXOffset; 426 FT_Short ySuperscriptYOffset; 427 FT_Short yStrikeoutSize; 428 FT_Short yStrikeoutPosition; 429 FT_Short sFamilyClass; 430 431 FT_Byte panose[10]; 432 433 FT_ULong ulUnicodeRange1; /* Bits 0-31 */ 434 FT_ULong ulUnicodeRange2; /* Bits 32-63 */ 435 FT_ULong ulUnicodeRange3; /* Bits 64-95 */ 436 FT_ULong ulUnicodeRange4; /* Bits 96-127 */ 437 438 FT_Char achVendID[4]; 439 440 FT_UShort fsSelection; 441 FT_UShort usFirstCharIndex; 442 FT_UShort usLastCharIndex; 443 FT_Short sTypoAscender; 444 FT_Short sTypoDescender; 445 FT_Short sTypoLineGap; 446 FT_UShort usWinAscent; 447 FT_UShort usWinDescent; 448 449 /* only version 1 and higher: */ 450 451 FT_ULong ulCodePageRange1; /* Bits 0-31 */ 452 FT_ULong ulCodePageRange2; /* Bits 32-63 */ 453 454 /* only version 2 and higher: */ 455 456 FT_Short sxHeight; 457 FT_Short sCapHeight; 458 FT_UShort usDefaultChar; 459 FT_UShort usBreakChar; 460 FT_UShort usMaxContext; 461 462 /* only version 5 and higher: */ 463 464 FT_UShort usLowerOpticalPointSize; /* in twips (1/20th points) */ 465 FT_UShort usUpperOpticalPointSize; /* in twips (1/20th points) */ 466 467 } TT_OS2; 468 469 470 /************************************************************************** 471 * 472 * @struct: 473 * TT_Postscript 474 * 475 * @description: 476 * A structure to model a TrueType `post' table. All fields comply 477 * to the OpenType specification. This structure does not reference 478 * a font's PostScript glyph names; use @FT_Get_Glyph_Name to 479 * retrieve them. 480 * 481 * @note: 482 * For an OpenType variation font, the values of the following fields 483 * can change after a call to @FT_Set_Var_Design_Coordinates (and 484 * friends) if the font contains an `MVAR' table: `underlinePosition' 485 * and `underlineThickness'. 486 */ 487 typedef struct TT_Postscript_ 488 { 489 FT_Fixed FormatType; 490 FT_Fixed italicAngle; 491 FT_Short underlinePosition; 492 FT_Short underlineThickness; 493 FT_ULong isFixedPitch; 494 FT_ULong minMemType42; 495 FT_ULong maxMemType42; 496 FT_ULong minMemType1; 497 FT_ULong maxMemType1; 498 499 /* Glyph names follow in the `post' table, but we don't */ 500 /* load them by default. */ 501 502 } TT_Postscript; 503 504 505 /************************************************************************** 506 * 507 * @struct: 508 * TT_PCLT 509 * 510 * @description: 511 * A structure to model a TrueType `PCLT' table. All fields comply 512 * to the OpenType specification. 513 */ 514 typedef struct TT_PCLT_ 515 { 516 FT_Fixed Version; 517 FT_ULong FontNumber; 518 FT_UShort Pitch; 519 FT_UShort xHeight; 520 FT_UShort Style; 521 FT_UShort TypeFamily; 522 FT_UShort CapHeight; 523 FT_UShort SymbolSet; 524 FT_Char TypeFace[16]; 525 FT_Char CharacterComplement[8]; 526 FT_Char FileName[6]; 527 FT_Char StrokeWeight; 528 FT_Char WidthType; 529 FT_Byte SerifStyle; 530 FT_Byte Reserved; 531 532 } TT_PCLT; 533 534 535 /************************************************************************** 536 * 537 * @struct: 538 * TT_MaxProfile 539 * 540 * @description: 541 * The maximum profile (`maxp') table contains many max values, which 542 * can be used to pre-allocate arrays for speeding up glyph loading 543 * and hinting. 544 * 545 * @fields: 546 * version :: 547 * The version number. 548 * 549 * numGlyphs :: 550 * The number of glyphs in this TrueType 551 * font. 552 * 553 * maxPoints :: 554 * The maximum number of points in a 555 * non-composite TrueType glyph. See also 556 * `maxCompositePoints'. 557 * 558 * maxContours :: 559 * The maximum number of contours in a 560 * non-composite TrueType glyph. See also 561 * `maxCompositeContours'. 562 * 563 * maxCompositePoints :: 564 * The maximum number of points in a 565 * composite TrueType glyph. See also 566 * `maxPoints'. 567 * 568 * maxCompositeContours :: 569 * The maximum number of contours in a 570 * composite TrueType glyph. See also 571 * `maxContours'. 572 * 573 * maxZones :: 574 * The maximum number of zones used for 575 * glyph hinting. 576 * 577 * maxTwilightPoints :: 578 * The maximum number of points in the 579 * twilight zone used for glyph hinting. 580 * 581 * maxStorage :: 582 * The maximum number of elements in the 583 * storage area used for glyph hinting. 584 * 585 * maxFunctionDefs :: 586 * The maximum number of function 587 * definitions in the TrueType bytecode for 588 * this font. 589 * 590 * maxInstructionDefs :: 591 * The maximum number of instruction 592 * definitions in the TrueType bytecode for 593 * this font. 594 * 595 * maxStackElements :: 596 * The maximum number of stack elements used 597 * during bytecode interpretation. 598 * 599 * maxSizeOfInstructions :: 600 * The maximum number of TrueType opcodes 601 * used for glyph hinting. 602 * 603 * maxComponentElements :: 604 * The maximum number of simple (i.e., 605 * non-composite) glyphs in a composite glyph. 606 * 607 * maxComponentDepth :: 608 * The maximum nesting depth of composite 609 * glyphs. 610 * 611 * @note: 612 * This structure is only used during font loading. 613 */ 614 typedef struct TT_MaxProfile_ 615 { 616 FT_Fixed version; 617 FT_UShort numGlyphs; 618 FT_UShort maxPoints; 619 FT_UShort maxContours; 620 FT_UShort maxCompositePoints; 621 FT_UShort maxCompositeContours; 622 FT_UShort maxZones; 623 FT_UShort maxTwilightPoints; 624 FT_UShort maxStorage; 625 FT_UShort maxFunctionDefs; 626 FT_UShort maxInstructionDefs; 627 FT_UShort maxStackElements; 628 FT_UShort maxSizeOfInstructions; 629 FT_UShort maxComponentElements; 630 FT_UShort maxComponentDepth; 631 632 } TT_MaxProfile; 633 634 635 /************************************************************************** 636 * 637 * @enum: 638 * FT_Sfnt_Tag 639 * 640 * @description: 641 * An enumeration to specify indices of SFNT tables loaded and parsed 642 * by FreeType during initialization of an SFNT font. Used in the 643 * @FT_Get_Sfnt_Table API function. 644 * 645 * @values: 646 * FT_SFNT_HEAD :: 647 * To access the font's @TT_Header structure. 648 * 649 * FT_SFNT_MAXP :: 650 * To access the font's @TT_MaxProfile structure. 651 * 652 * FT_SFNT_OS2 :: 653 * To access the font's @TT_OS2 structure. 654 * 655 * FT_SFNT_HHEA :: 656 * To access the font's @TT_HoriHeader structure. 657 * 658 * FT_SFNT_VHEA :: 659 * To access the font's @TT_VertHeader structure. 660 * 661 * FT_SFNT_POST :: 662 * To access the font's @TT_Postscript structure. 663 * 664 * FT_SFNT_PCLT :: 665 * To access the font's @TT_PCLT structure. 666 */ 667 typedef enum FT_Sfnt_Tag_ 668 { 669 FT_SFNT_HEAD, 670 FT_SFNT_MAXP, 671 FT_SFNT_OS2, 672 FT_SFNT_HHEA, 673 FT_SFNT_VHEA, 674 FT_SFNT_POST, 675 FT_SFNT_PCLT, 676 677 FT_SFNT_MAX 678 679 } FT_Sfnt_Tag; 680 681 /* these constants are deprecated; use the corresponding `FT_Sfnt_Tag' */ 682 /* values instead */ 683 #define ft_sfnt_head FT_SFNT_HEAD 684 #define ft_sfnt_maxp FT_SFNT_MAXP 685 #define ft_sfnt_os2 FT_SFNT_OS2 686 #define ft_sfnt_hhea FT_SFNT_HHEA 687 #define ft_sfnt_vhea FT_SFNT_VHEA 688 #define ft_sfnt_post FT_SFNT_POST 689 #define ft_sfnt_pclt FT_SFNT_PCLT 690 691 692 /************************************************************************** 693 * 694 * @function: 695 * FT_Get_Sfnt_Table 696 * 697 * @description: 698 * Return a pointer to a given SFNT table stored within a face. 699 * 700 * @input: 701 * face :: 702 * A handle to the source. 703 * 704 * tag :: 705 * The index of the SFNT table. 706 * 707 * @return: 708 * A type-less pointer to the table. This will be NULL in case of 709 * error, or if the corresponding table was not found *OR* loaded 710 * from the file. 711 * 712 * Use a typecast according to `tag' to access the structure 713 * elements. 714 * 715 * @note: 716 * The table is owned by the face object and disappears with it. 717 * 718 * This function is only useful to access SFNT tables that are loaded 719 * by the sfnt, truetype, and opentype drivers. See @FT_Sfnt_Tag for 720 * a list. 721 * 722 * @example: 723 * Here an example how to access the `vhea' table. 724 * 725 * { 726 * TT_VertHeader* vert_header; 727 * 728 * 729 * vert_header = 730 * (TT_VertHeader*)FT_Get_Sfnt_Table( face, FT_SFNT_VHEA ); 731 * } 732 */ 733 FT_EXPORT( void* ) 734 FT_Get_Sfnt_Table( FT_Face face, 735 FT_Sfnt_Tag tag ); 736 737 738 /************************************************************************** 739 * 740 * @function: 741 * FT_Load_Sfnt_Table 742 * 743 * @description: 744 * Load any SFNT font table into client memory. 745 * 746 * @input: 747 * face :: 748 * A handle to the source face. 749 * 750 * tag :: 751 * The four-byte tag of the table to load. Use value~0 if you want 752 * to access the whole font file. Otherwise, you can use one of the 753 * definitions found in the @FT_TRUETYPE_TAGS_H file, or forge a new 754 * one with @FT_MAKE_TAG. 755 * 756 * offset :: 757 * The starting offset in the table (or file if tag~==~0). 758 * 759 * @output: 760 * buffer :: 761 * The target buffer address. The client must ensure that the memory 762 * array is big enough to hold the data. 763 * 764 * @inout: 765 * length :: 766 * If the `length' parameter is NULL, try to load the whole table. 767 * Return an error code if it fails. 768 * 769 * Else, if `*length' is~0, exit immediately while returning the 770 * table's (or file) full size in it. 771 * 772 * Else the number of bytes to read from the table or file, from the 773 * starting offset. 774 * 775 * @return: 776 * FreeType error code. 0~means success. 777 * 778 * @note: 779 * If you need to determine the table's length you should first call this 780 * function with `*length' set to~0, as in the following example: 781 * 782 * { 783 * FT_ULong length = 0; 784 * 785 * 786 * error = FT_Load_Sfnt_Table( face, tag, 0, NULL, &length ); 787 * if ( error ) { ... table does not exist ... } 788 * 789 * buffer = malloc( length ); 790 * if ( buffer == NULL ) { ... not enough memory ... } 791 * 792 * error = FT_Load_Sfnt_Table( face, tag, 0, buffer, &length ); 793 * if ( error ) { ... could not load table ... } 794 * } 795 * 796 * Note that structures like @TT_Header or @TT_OS2 can't be used with 797 * this function; they are limited to @FT_Get_Sfnt_Table. Reason is that 798 * those structures depend on the processor architecture, with varying 799 * size (e.g. 32bit vs. 64bit) or order (big endian vs. little endian). 800 * 801 */ 802 FT_EXPORT( FT_Error ) 803 FT_Load_Sfnt_Table( FT_Face face, 804 FT_ULong tag, 805 FT_Long offset, 806 FT_Byte* buffer, 807 FT_ULong* length ); 808 809 810 /************************************************************************** 811 * 812 * @function: 813 * FT_Sfnt_Table_Info 814 * 815 * @description: 816 * Return information on an SFNT table. 817 * 818 * @input: 819 * face :: 820 * A handle to the source face. 821 * 822 * table_index :: 823 * The index of an SFNT table. The function returns 824 * FT_Err_Table_Missing for an invalid value. 825 * 826 * @inout: 827 * tag :: 828 * The name tag of the SFNT table. If the value is NULL, `table_index' 829 * is ignored, and `length' returns the number of SFNT tables in the 830 * font. 831 * 832 * @output: 833 * length :: 834 * The length of the SFNT table (or the number of SFNT tables, depending 835 * on `tag'). 836 * 837 * @return: 838 * FreeType error code. 0~means success. 839 * 840 * @note: 841 * While parsing fonts, FreeType handles SFNT tables with length zero as 842 * missing. 843 * 844 */ 845 FT_EXPORT( FT_Error ) 846 FT_Sfnt_Table_Info( FT_Face face, 847 FT_UInt table_index, 848 FT_ULong *tag, 849 FT_ULong *length ); 850 851 852 /************************************************************************** 853 * 854 * @function: 855 * FT_Get_CMap_Language_ID 856 * 857 * @description: 858 * Return cmap language ID as specified in the OpenType standard. 859 * Definitions of language ID values are in file @FT_TRUETYPE_IDS_H. 860 * 861 * @input: 862 * charmap :: 863 * The target charmap. 864 * 865 * @return: 866 * The language ID of `charmap'. If `charmap' doesn't belong to an 867 * SFNT face, just return~0 as the default value. 868 * 869 * For a format~14 cmap (to access Unicode IVS), the return value is 870 * 0xFFFFFFFF. 871 */ 872 FT_EXPORT( FT_ULong ) 873 FT_Get_CMap_Language_ID( FT_CharMap charmap ); 874 875 876 /************************************************************************** 877 * 878 * @function: 879 * FT_Get_CMap_Format 880 * 881 * @description: 882 * Return the format of an SFNT `cmap' table. 883 * 884 * @input: 885 * charmap :: 886 * The target charmap. 887 * 888 * @return: 889 * The format of `charmap'. If `charmap' doesn't belong to an SFNT 890 * face, return -1. 891 */ 892 FT_EXPORT( FT_Long ) 893 FT_Get_CMap_Format( FT_CharMap charmap ); 894 895 /* */ 896 897 898 FT_END_HEADER 899 900 #endif /* TTTABLES_H_ */ 901 902 903 /* END */ 904
