1/***************************************************************************/ 2/* */ 3/* freetype.h */ 4/* */ 5/* FreeType high-level API and common types (specification only). */ 6/* */ 7/* Copyright 1996-2012 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 FT_FREETYPE_H 20#error "`ft2build.h' hasn't been included yet!" 21#error "Please always use macros to include FreeType header files." 22#error "Example:" 23#error " #include <ft2build.h>" 24#error " #include FT_FREETYPE_H" 25#endif 26 27 28#ifndef __FREETYPE_H__ 29#define __FREETYPE_H__ 30 31 32#include <ft2build.h> 33#include FT_CONFIG_CONFIG_H 34#include FT_ERRORS_H 35#include FT_TYPES_H 36 37 38FT_BEGIN_HEADER 39 40 41 42 /*************************************************************************/ 43 /* */ 44 /* <Section> */ 45 /* user_allocation */ 46 /* */ 47 /* <Title> */ 48 /* User allocation */ 49 /* */ 50 /* <Abstract> */ 51 /* How client applications should allocate FreeType data structures. */ 52 /* */ 53 /* <Description> */ 54 /* FreeType assumes that structures allocated by the user and passed */ 55 /* as arguments are zeroed out except for the actual data. In other */ 56 /* words, it is recommended to use `calloc' (or variants of it) */ 57 /* instead of `malloc' for allocation. */ 58 /* */ 59 /*************************************************************************/ 60 61 62 63 /*************************************************************************/ 64 /*************************************************************************/ 65 /* */ 66 /* B A S I C T Y P E S */ 67 /* */ 68 /*************************************************************************/ 69 /*************************************************************************/ 70 71 72 /*************************************************************************/ 73 /* */ 74 /* <Section> */ 75 /* base_interface */ 76 /* */ 77 /* <Title> */ 78 /* Base Interface */ 79 /* */ 80 /* <Abstract> */ 81 /* The FreeType~2 base font interface. */ 82 /* */ 83 /* <Description> */ 84 /* This section describes the public high-level API of FreeType~2. */ 85 /* */ 86 /* <Order> */ 87 /* FT_Library */ 88 /* FT_Face */ 89 /* FT_Size */ 90 /* FT_GlyphSlot */ 91 /* FT_CharMap */ 92 /* FT_Encoding */ 93 /* */ 94 /* FT_FaceRec */ 95 /* */ 96 /* FT_FACE_FLAG_SCALABLE */ 97 /* FT_FACE_FLAG_FIXED_SIZES */ 98 /* FT_FACE_FLAG_FIXED_WIDTH */ 99 /* FT_FACE_FLAG_HORIZONTAL */ 100 /* FT_FACE_FLAG_VERTICAL */ 101 /* FT_FACE_FLAG_SFNT */ 102 /* FT_FACE_FLAG_KERNING */ 103 /* FT_FACE_FLAG_MULTIPLE_MASTERS */ 104 /* FT_FACE_FLAG_GLYPH_NAMES */ 105 /* FT_FACE_FLAG_EXTERNAL_STREAM */ 106 /* FT_FACE_FLAG_FAST_GLYPHS */ 107 /* FT_FACE_FLAG_HINTER */ 108 /* */ 109 /* FT_STYLE_FLAG_BOLD */ 110 /* FT_STYLE_FLAG_ITALIC */ 111 /* */ 112 /* FT_SizeRec */ 113 /* FT_Size_Metrics */ 114 /* */ 115 /* FT_GlyphSlotRec */ 116 /* FT_Glyph_Metrics */ 117 /* FT_SubGlyph */ 118 /* */ 119 /* FT_Bitmap_Size */ 120 /* */ 121 /* FT_Init_FreeType */ 122 /* FT_Done_FreeType */ 123 /* */ 124 /* FT_New_Face */ 125 /* FT_Done_Face */ 126 /* FT_New_Memory_Face */ 127 /* FT_Open_Face */ 128 /* FT_Open_Args */ 129 /* FT_Parameter */ 130 /* FT_Attach_File */ 131 /* FT_Attach_Stream */ 132 /* */ 133 /* FT_Set_Char_Size */ 134 /* FT_Set_Pixel_Sizes */ 135 /* FT_Request_Size */ 136 /* FT_Select_Size */ 137 /* FT_Size_Request_Type */ 138 /* FT_Size_Request */ 139 /* FT_Set_Transform */ 140 /* FT_Load_Glyph */ 141 /* FT_Get_Char_Index */ 142 /* FT_Get_Name_Index */ 143 /* FT_Load_Char */ 144 /* */ 145 /* FT_OPEN_MEMORY */ 146 /* FT_OPEN_STREAM */ 147 /* FT_OPEN_PATHNAME */ 148 /* FT_OPEN_DRIVER */ 149 /* FT_OPEN_PARAMS */ 150 /* */ 151 /* FT_LOAD_DEFAULT */ 152 /* FT_LOAD_RENDER */ 153 /* FT_LOAD_MONOCHROME */ 154 /* FT_LOAD_LINEAR_DESIGN */ 155 /* FT_LOAD_NO_SCALE */ 156 /* FT_LOAD_NO_HINTING */ 157 /* FT_LOAD_NO_BITMAP */ 158 /* FT_LOAD_CROP_BITMAP */ 159 /* */ 160 /* FT_LOAD_VERTICAL_LAYOUT */ 161 /* FT_LOAD_IGNORE_TRANSFORM */ 162 /* FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH */ 163 /* FT_LOAD_FORCE_AUTOHINT */ 164 /* FT_LOAD_NO_RECURSE */ 165 /* FT_LOAD_PEDANTIC */ 166 /* */ 167 /* FT_LOAD_TARGET_NORMAL */ 168 /* FT_LOAD_TARGET_LIGHT */ 169 /* FT_LOAD_TARGET_MONO */ 170 /* FT_LOAD_TARGET_LCD */ 171 /* FT_LOAD_TARGET_LCD_V */ 172 /* */ 173 /* FT_Render_Glyph */ 174 /* FT_Render_Mode */ 175 /* FT_Get_Kerning */ 176 /* FT_Kerning_Mode */ 177 /* FT_Get_Track_Kerning */ 178 /* FT_Get_Glyph_Name */ 179 /* FT_Get_Postscript_Name */ 180 /* */ 181 /* FT_CharMapRec */ 182 /* FT_Select_Charmap */ 183 /* FT_Set_Charmap */ 184 /* FT_Get_Charmap_Index */ 185 /* */ 186 /* FT_FSTYPE_INSTALLABLE_EMBEDDING */ 187 /* FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING */ 188 /* FT_FSTYPE_PREVIEW_AND_PRINT_EMBEDDING */ 189 /* FT_FSTYPE_EDITABLE_EMBEDDING */ 190 /* FT_FSTYPE_NO_SUBSETTING */ 191 /* FT_FSTYPE_BITMAP_EMBEDDING_ONLY */ 192 /* */ 193 /* FT_Get_FSType_Flags */ 194 /* */ 195 /*************************************************************************/ 196 197 198 /*************************************************************************/ 199 /* */ 200 /* <Struct> */ 201 /* FT_Glyph_Metrics */ 202 /* */ 203 /* <Description> */ 204 /* A structure used to model the metrics of a single glyph. The */ 205 /* values are expressed in 26.6 fractional pixel format; if the flag */ 206 /* @FT_LOAD_NO_SCALE has been used while loading the glyph, values */ 207 /* are expressed in font units instead. */ 208 /* */ 209 /* <Fields> */ 210 /* width :: */ 211 /* The glyph's width. */ 212 /* */ 213 /* height :: */ 214 /* The glyph's height. */ 215 /* */ 216 /* horiBearingX :: */ 217 /* Left side bearing for horizontal layout. */ 218 /* */ 219 /* horiBearingY :: */ 220 /* Top side bearing for horizontal layout. */ 221 /* */ 222 /* horiAdvance :: */ 223 /* Advance width for horizontal layout. */ 224 /* */ 225 /* vertBearingX :: */ 226 /* Left side bearing for vertical layout. */ 227 /* */ 228 /* vertBearingY :: */ 229 /* Top side bearing for vertical layout. Larger positive values */ 230 /* mean further below the vertical glyph origin. */ 231 /* */ 232 /* vertAdvance :: */ 233 /* Advance height for vertical layout. Positive values mean the */ 234 /* glyph has a positive advance downward. */ 235 /* */ 236 /* <Note> */ 237 /* If not disabled with @FT_LOAD_NO_HINTING, the values represent */ 238 /* dimensions of the hinted glyph (in case hinting is applicable). */ 239 /* */ 240 typedef struct FT_Glyph_Metrics_ 241 { 242 FT_Pos width; 243 FT_Pos height; 244 245 FT_Pos horiBearingX; 246 FT_Pos horiBearingY; 247 FT_Pos horiAdvance; 248 249 FT_Pos vertBearingX; 250 FT_Pos vertBearingY; 251 FT_Pos vertAdvance; 252 253 } FT_Glyph_Metrics; 254 255 256 /*************************************************************************/ 257 /* */ 258 /* <Struct> */ 259 /* FT_Bitmap_Size */ 260 /* */ 261 /* <Description> */ 262 /* This structure models the metrics of a bitmap strike (i.e., a set */ 263 /* of glyphs for a given point size and resolution) in a bitmap font. */ 264 /* It is used for the `available_sizes' field of @FT_Face. */ 265 /* */ 266 /* <Fields> */ 267 /* height :: The vertical distance, in pixels, between two */ 268 /* consecutive baselines. It is always positive. */ 269 /* */ 270 /* width :: The average width, in pixels, of all glyphs in the */ 271 /* strike. */ 272 /* */ 273 /* size :: The nominal size of the strike in 26.6 fractional */ 274 /* points. This field is not very useful. */ 275 /* */ 276 /* x_ppem :: The horizontal ppem (nominal width) in 26.6 fractional */ 277 /* pixels. */ 278 /* */ 279 /* y_ppem :: The vertical ppem (nominal height) in 26.6 fractional */ 280 /* pixels. */ 281 /* */ 282 /* <Note> */ 283 /* Windows FNT: */ 284 /* The nominal size given in a FNT font is not reliable. Thus when */ 285 /* the driver finds it incorrect, it sets `size' to some calculated */ 286 /* values and sets `x_ppem' and `y_ppem' to the pixel width and */ 287 /* height given in the font, respectively. */ 288 /* */ 289 /* TrueType embedded bitmaps: */ 290 /* `size', `width', and `height' values are not contained in the */ 291 /* bitmap strike itself. They are computed from the global font */ 292 /* parameters. */ 293 /* */ 294 typedef struct FT_Bitmap_Size_ 295 { 296 FT_Short height; 297 FT_Short width; 298 299 FT_Pos size; 300 301 FT_Pos x_ppem; 302 FT_Pos y_ppem; 303 304 } FT_Bitmap_Size; 305 306 307 /*************************************************************************/ 308 /*************************************************************************/ 309 /* */ 310 /* O B J E C T C L A S S E S */ 311 /* */ 312 /*************************************************************************/ 313 /*************************************************************************/ 314 315 /*************************************************************************/ 316 /* */ 317 /* <Type> */ 318 /* FT_Library */ 319 /* */ 320 /* <Description> */ 321 /* A handle to a FreeType library instance. Each `library' is */ 322 /* completely independent from the others; it is the `root' of a set */ 323 /* of objects like fonts, faces, sizes, etc. */ 324 /* */ 325 /* It also embeds a memory manager (see @FT_Memory), as well as a */ 326 /* scan-line converter object (see @FT_Raster). */ 327 /* */ 328 /* For multi-threading applications each thread should have its own */ 329 /* FT_Library object. */ 330 /* */ 331 /* <Note> */ 332 /* Library objects are normally created by @FT_Init_FreeType, and */ 333 /* destroyed with @FT_Done_FreeType. */ 334 /* */ 335 typedef struct FT_LibraryRec_ *FT_Library; 336 337 338 /*************************************************************************/ 339 /* */ 340 /* <Type> */ 341 /* FT_Module */ 342 /* */ 343 /* <Description> */ 344 /* A handle to a given FreeType module object. Each module can be a */ 345 /* font driver, a renderer, or anything else that provides services */ 346 /* to the formers. */ 347 /* */ 348 typedef struct FT_ModuleRec_* FT_Module; 349 350 351 /*************************************************************************/ 352 /* */ 353 /* <Type> */ 354 /* FT_Driver */ 355 /* */ 356 /* <Description> */ 357 /* A handle to a given FreeType font driver object. Each font driver */ 358 /* is a special module capable of creating faces from font files. */ 359 /* */ 360 typedef struct FT_DriverRec_* FT_Driver; 361 362 363 /*************************************************************************/ 364 /* */ 365 /* <Type> */ 366 /* FT_Renderer */ 367 /* */ 368 /* <Description> */ 369 /* A handle to a given FreeType renderer. A renderer is a special */ 370 /* module in charge of converting a glyph image to a bitmap, when */ 371 /* necessary. Each renderer supports a given glyph image format, and */ 372 /* one or more target surface depths. */ 373 /* */ 374 typedef struct FT_RendererRec_* FT_Renderer; 375 376 377 /*************************************************************************/ 378 /* */ 379 /* <Type> */ 380 /* FT_Face */ 381 /* */ 382 /* <Description> */ 383 /* A handle to a given typographic face object. A face object models */ 384 /* a given typeface, in a given style. */ 385 /* */ 386 /* <Note> */ 387 /* Each face object also owns a single @FT_GlyphSlot object, as well */ 388 /* as one or more @FT_Size objects. */ 389 /* */ 390 /* Use @FT_New_Face or @FT_Open_Face to create a new face object from */ 391 /* a given filepathname or a custom input stream. */ 392 /* */ 393 /* Use @FT_Done_Face to destroy it (along with its slot and sizes). */ 394 /* */ 395 /* <Also> */ 396 /* See @FT_FaceRec for the publicly accessible fields of a given face */ 397 /* object. */ 398 /* */ 399 typedef struct FT_FaceRec_* FT_Face; 400 401 402 /*************************************************************************/ 403 /* */ 404 /* <Type> */ 405 /* FT_Size */ 406 /* */ 407 /* <Description> */ 408 /* A handle to an object used to model a face scaled to a given */ 409 /* character size. */ 410 /* */ 411 /* <Note> */ 412 /* Each @FT_Face has an _active_ @FT_Size object that is used by */ 413 /* functions like @FT_Load_Glyph to determine the scaling */ 414 /* transformation which is used to load and hint glyphs and metrics. */ 415 /* */ 416 /* You can use @FT_Set_Char_Size, @FT_Set_Pixel_Sizes, */ 417 /* @FT_Request_Size or even @FT_Select_Size to change the content */ 418 /* (i.e., the scaling values) of the active @FT_Size. */ 419 /* */ 420 /* You can use @FT_New_Size to create additional size objects for a */ 421 /* given @FT_Face, but they won't be used by other functions until */ 422 /* you activate it through @FT_Activate_Size. Only one size can be */ 423 /* activated at any given time per face. */ 424 /* */ 425 /* <Also> */ 426 /* See @FT_SizeRec for the publicly accessible fields of a given size */ 427 /* object. */ 428 /* */ 429 typedef struct FT_SizeRec_* FT_Size; 430 431 432 /*************************************************************************/ 433 /* */ 434 /* <Type> */ 435 /* FT_GlyphSlot */ 436 /* */ 437 /* <Description> */ 438 /* A handle to a given `glyph slot'. A slot is a container where it */ 439 /* is possible to load any of the glyphs contained in its parent */ 440 /* face. */ 441 /* */ 442 /* In other words, each time you call @FT_Load_Glyph or */ 443 /* @FT_Load_Char, the slot's content is erased by the new glyph data, */ 444 /* i.e., the glyph's metrics, its image (bitmap or outline), and */ 445 /* other control information. */ 446 /* */ 447 /* <Also> */ 448 /* See @FT_GlyphSlotRec for the publicly accessible glyph fields. */ 449 /* */ 450 typedef struct FT_GlyphSlotRec_* FT_GlyphSlot; 451 452 453 /*************************************************************************/ 454 /* */ 455 /* <Type> */ 456 /* FT_CharMap */ 457 /* */ 458 /* <Description> */ 459 /* A handle to a given character map. A charmap is used to translate */ 460 /* character codes in a given encoding into glyph indexes for its */ 461 /* parent's face. Some font formats may provide several charmaps per */ 462 /* font. */ 463 /* */ 464 /* Each face object owns zero or more charmaps, but only one of them */ 465 /* can be `active' and used by @FT_Get_Char_Index or @FT_Load_Char. */ 466 /* */ 467 /* The list of available charmaps in a face is available through the */ 468 /* `face->num_charmaps' and `face->charmaps' fields of @FT_FaceRec. */ 469 /* */ 470 /* The currently active charmap is available as `face->charmap'. */ 471 /* You should call @FT_Set_Charmap to change it. */ 472 /* */ 473 /* <Note> */ 474 /* When a new face is created (either through @FT_New_Face or */ 475 /* @FT_Open_Face), the library looks for a Unicode charmap within */ 476 /* the list and automatically activates it. */ 477 /* */ 478 /* <Also> */ 479 /* See @FT_CharMapRec for the publicly accessible fields of a given */ 480 /* character map. */ 481 /* */ 482 typedef struct FT_CharMapRec_* FT_CharMap; 483 484 485 /*************************************************************************/ 486 /* */ 487 /* <Macro> */ 488 /* FT_ENC_TAG */ 489 /* */ 490 /* <Description> */ 491 /* This macro converts four-letter tags into an unsigned long. It is */ 492 /* used to define `encoding' identifiers (see @FT_Encoding). */ 493 /* */ 494 /* <Note> */ 495 /* Since many 16-bit compilers don't like 32-bit enumerations, you */ 496 /* should redefine this macro in case of problems to something like */ 497 /* this: */ 498 /* */ 499 /* { */ 500 /* #define FT_ENC_TAG( value, a, b, c, d ) value */ 501 /* } */ 502 /* */ 503 /* to get a simple enumeration without assigning special numbers. */ 504 /* */ 505 506#ifndef FT_ENC_TAG 507#define FT_ENC_TAG( value, a, b, c, d ) \ 508 value = ( ( (FT_UInt32)(a) << 24 ) | \ 509 ( (FT_UInt32)(b) << 16 ) | \ 510 ( (FT_UInt32)(c) << 8 ) | \ 511 (FT_UInt32)(d) ) 512 513#endif /* FT_ENC_TAG */ 514 515 516 /*************************************************************************/ 517 /* */ 518 /* <Enum> */ 519 /* FT_Encoding */ 520 /* */ 521 /* <Description> */ 522 /* An enumeration used to specify character sets supported by */ 523 /* charmaps. Used in the @FT_Select_Charmap API function. */ 524 /* */ 525 /* <Note> */ 526 /* Despite the name, this enumeration lists specific character */ 527 /* repertories (i.e., charsets), and not text encoding methods (e.g., */ 528 /* UTF-8, UTF-16, etc.). */ 529 /* */ 530 /* Other encodings might be defined in the future. */ 531 /* */ 532 /* <Values> */ 533 /* FT_ENCODING_NONE :: */ 534 /* The encoding value~0 is reserved. */ 535 /* */ 536 /* FT_ENCODING_UNICODE :: */ 537 /* Corresponds to the Unicode character set. This value covers */ 538 /* all versions of the Unicode repertoire, including ASCII and */ 539 /* Latin-1. Most fonts include a Unicode charmap, but not all */ 540 /* of them. */ 541 /* */ 542 /* For example, if you want to access Unicode value U+1F028 (and */ 543 /* the font contains it), use value 0x1F028 as the input value for */ 544 /* @FT_Get_Char_Index. */ 545 /* */ 546 /* FT_ENCODING_MS_SYMBOL :: */ 547 /* Corresponds to the Microsoft Symbol encoding, used to encode */ 548 /* mathematical symbols in the 32..255 character code range. For */ 549 /* more information, see `http://www.ceviz.net/symbol.htm'. */ 550 /* */ 551 /* FT_ENCODING_SJIS :: */ 552 /* Corresponds to Japanese SJIS encoding. More info at */ 553 /* at `http://langsupport.japanreference.com/encoding.shtml'. */ 554 /* See note on multi-byte encodings below. */ 555 /* */ 556 /* FT_ENCODING_GB2312 :: */ 557 /* Corresponds to an encoding system for Simplified Chinese as used */ 558 /* used in mainland China. */ 559 /* */ 560 /* FT_ENCODING_BIG5 :: */ 561 /* Corresponds to an encoding system for Traditional Chinese as */ 562 /* used in Taiwan and Hong Kong. */ 563 /* */ 564 /* FT_ENCODING_WANSUNG :: */ 565 /* Corresponds to the Korean encoding system known as Wansung. */ 566 /* For more information see */ 567 /* `http://www.microsoft.com/typography/unicode/949.txt'. */ 568 /* */ 569 /* FT_ENCODING_JOHAB :: */ 570 /* The Korean standard character set (KS~C 5601-1992), which */ 571 /* corresponds to MS Windows code page 1361. This character set */ 572 /* includes all possible Hangeul character combinations. */ 573 /* */ 574 /* FT_ENCODING_ADOBE_LATIN_1 :: */ 575 /* Corresponds to a Latin-1 encoding as defined in a Type~1 */ 576 /* PostScript font. It is limited to 256 character codes. */ 577 /* */ 578 /* FT_ENCODING_ADOBE_STANDARD :: */ 579 /* Corresponds to the Adobe Standard encoding, as found in Type~1, */ 580 /* CFF, and OpenType/CFF fonts. It is limited to 256 character */ 581 /* codes. */ 582 /* */ 583 /* FT_ENCODING_ADOBE_EXPERT :: */ 584 /* Corresponds to the Adobe Expert encoding, as found in Type~1, */ 585 /* CFF, and OpenType/CFF fonts. It is limited to 256 character */ 586 /* codes. */ 587 /* */ 588 /* FT_ENCODING_ADOBE_CUSTOM :: */ 589 /* Corresponds to a custom encoding, as found in Type~1, CFF, and */ 590 /* OpenType/CFF fonts. It is limited to 256 character codes. */ 591 /* */ 592 /* FT_ENCODING_APPLE_ROMAN :: */ 593 /* Corresponds to the 8-bit Apple roman encoding. Many TrueType */ 594 /* and OpenType fonts contain a charmap for this encoding, since */ 595 /* older versions of Mac OS are able to use it. */ 596 /* */ 597 /* FT_ENCODING_OLD_LATIN_2 :: */ 598 /* This value is deprecated and was never used nor reported by */ 599 /* FreeType. Don't use or test for it. */ 600 /* */ 601 /* FT_ENCODING_MS_SJIS :: */ 602 /* Same as FT_ENCODING_SJIS. Deprecated. */ 603 /* */ 604 /* FT_ENCODING_MS_GB2312 :: */ 605 /* Same as FT_ENCODING_GB2312. Deprecated. */ 606 /* */ 607 /* FT_ENCODING_MS_BIG5 :: */ 608 /* Same as FT_ENCODING_BIG5. Deprecated. */ 609 /* */ 610 /* FT_ENCODING_MS_WANSUNG :: */ 611 /* Same as FT_ENCODING_WANSUNG. Deprecated. */ 612 /* */ 613 /* FT_ENCODING_MS_JOHAB :: */ 614 /* Same as FT_ENCODING_JOHAB. Deprecated. */ 615 /* */ 616 /* <Note> */ 617 /* By default, FreeType automatically synthesizes a Unicode charmap */ 618 /* for PostScript fonts, using their glyph names dictionaries. */ 619 /* However, it also reports the encodings defined explicitly in the */ 620 /* font file, for the cases when they are needed, with the Adobe */ 621 /* values as well. */ 622 /* */ 623 /* FT_ENCODING_NONE is set by the BDF and PCF drivers if the charmap */ 624 /* is neither Unicode nor ISO-8859-1 (otherwise it is set to */ 625 /* FT_ENCODING_UNICODE). Use @FT_Get_BDF_Charset_ID to find out */ 626 /* which encoding is really present. If, for example, the */ 627 /* `cs_registry' field is `KOI8' and the `cs_encoding' field is `R', */ 628 /* the font is encoded in KOI8-R. */ 629 /* */ 630 /* FT_ENCODING_NONE is always set (with a single exception) by the */ 631 /* winfonts driver. Use @FT_Get_WinFNT_Header and examine the */ 632 /* `charset' field of the @FT_WinFNT_HeaderRec structure to find out */ 633 /* which encoding is really present. For example, */ 634 /* @FT_WinFNT_ID_CP1251 (204) means Windows code page 1251 (for */ 635 /* Russian). */ 636 /* */ 637 /* FT_ENCODING_NONE is set if `platform_id' is @TT_PLATFORM_MACINTOSH */ 638 /* and `encoding_id' is not @TT_MAC_ID_ROMAN (otherwise it is set to */ 639 /* FT_ENCODING_APPLE_ROMAN). */ 640 /* */ 641 /* If `platform_id' is @TT_PLATFORM_MACINTOSH, use the function */ 642 /* @FT_Get_CMap_Language_ID to query the Mac language ID which may */ 643 /* be needed to be able to distinguish Apple encoding variants. See */ 644 /* */ 645 /* http://www.unicode.org/Public/MAPPINGS/VENDORS/APPLE/README.TXT */ 646 /* */ 647 /* to get an idea how to do that. Basically, if the language ID */ 648 /* is~0, don't use it, otherwise subtract 1 from the language ID. */ 649 /* Then examine `encoding_id'. If, for example, `encoding_id' is */ 650 /* @TT_MAC_ID_ROMAN and the language ID (minus~1) is */ 651 /* `TT_MAC_LANGID_GREEK', it is the Greek encoding, not Roman. */ 652 /* @TT_MAC_ID_ARABIC with `TT_MAC_LANGID_FARSI' means the Farsi */ 653 /* variant the Arabic encoding. */ 654 /* */ 655 typedef enum FT_Encoding_ 656 { 657 FT_ENC_TAG( FT_ENCODING_NONE, 0, 0, 0, 0 ), 658 659 FT_ENC_TAG( FT_ENCODING_MS_SYMBOL, 's', 'y', 'm', 'b' ), 660 FT_ENC_TAG( FT_ENCODING_UNICODE, 'u', 'n', 'i', 'c' ), 661 662 FT_ENC_TAG( FT_ENCODING_SJIS, 's', 'j', 'i', 's' ), 663 FT_ENC_TAG( FT_ENCODING_GB2312, 'g', 'b', ' ', ' ' ), 664 FT_ENC_TAG( FT_ENCODING_BIG5, 'b', 'i', 'g', '5' ), 665 FT_ENC_TAG( FT_ENCODING_WANSUNG, 'w', 'a', 'n', 's' ), 666 FT_ENC_TAG( FT_ENCODING_JOHAB, 'j', 'o', 'h', 'a' ), 667 668 /* for backwards compatibility */ 669 FT_ENCODING_MS_SJIS = FT_ENCODING_SJIS, 670 FT_ENCODING_MS_GB2312 = FT_ENCODING_GB2312, 671 FT_ENCODING_MS_BIG5 = FT_ENCODING_BIG5, 672 FT_ENCODING_MS_WANSUNG = FT_ENCODING_WANSUNG, 673 FT_ENCODING_MS_JOHAB = FT_ENCODING_JOHAB, 674 675 FT_ENC_TAG( FT_ENCODING_ADOBE_STANDARD, 'A', 'D', 'O', 'B' ), 676 FT_ENC_TAG( FT_ENCODING_ADOBE_EXPERT, 'A', 'D', 'B', 'E' ), 677 FT_ENC_TAG( FT_ENCODING_ADOBE_CUSTOM, 'A', 'D', 'B', 'C' ), 678 FT_ENC_TAG( FT_ENCODING_ADOBE_LATIN_1, 'l', 'a', 't', '1' ), 679 680 FT_ENC_TAG( FT_ENCODING_OLD_LATIN_2, 'l', 'a', 't', '2' ), 681 682 FT_ENC_TAG( FT_ENCODING_APPLE_ROMAN, 'a', 'r', 'm', 'n' ) 683 684 } FT_Encoding; 685 686 687 /*************************************************************************/ 688 /* */ 689 /* <Enum> */ 690 /* ft_encoding_xxx */ 691 /* */ 692 /* <Description> */ 693 /* These constants are deprecated; use the corresponding @FT_Encoding */ 694 /* values instead. */ 695 /* */ 696#define ft_encoding_none FT_ENCODING_NONE 697#define ft_encoding_unicode FT_ENCODING_UNICODE 698#define ft_encoding_symbol FT_ENCODING_MS_SYMBOL 699#define ft_encoding_latin_1 FT_ENCODING_ADOBE_LATIN_1 700#define ft_encoding_latin_2 FT_ENCODING_OLD_LATIN_2 701#define ft_encoding_sjis FT_ENCODING_SJIS 702#define ft_encoding_gb2312 FT_ENCODING_GB2312 703#define ft_encoding_big5 FT_ENCODING_BIG5 704#define ft_encoding_wansung FT_ENCODING_WANSUNG 705#define ft_encoding_johab FT_ENCODING_JOHAB 706 707#define ft_encoding_adobe_standard FT_ENCODING_ADOBE_STANDARD 708#define ft_encoding_adobe_expert FT_ENCODING_ADOBE_EXPERT 709#define ft_encoding_adobe_custom FT_ENCODING_ADOBE_CUSTOM 710#define ft_encoding_apple_roman FT_ENCODING_APPLE_ROMAN 711 712 713 /*************************************************************************/ 714 /* */ 715 /* <Struct> */ 716 /* FT_CharMapRec */ 717 /* */ 718 /* <Description> */ 719 /* The base charmap structure. */ 720 /* */ 721 /* <Fields> */ 722 /* face :: A handle to the parent face object. */ 723 /* */ 724 /* encoding :: An @FT_Encoding tag identifying the charmap. Use */ 725 /* this with @FT_Select_Charmap. */ 726 /* */ 727 /* platform_id :: An ID number describing the platform for the */ 728 /* following encoding ID. This comes directly from */ 729 /* the TrueType specification and should be emulated */ 730 /* for other formats. */ 731 /* */ 732 /* encoding_id :: A platform specific encoding number. This also */ 733 /* comes from the TrueType specification and should be */ 734 /* emulated similarly. */ 735 /* */ 736 typedef struct FT_CharMapRec_ 737 { 738 FT_Face face; 739 FT_Encoding encoding; 740 FT_UShort platform_id; 741 FT_UShort encoding_id; 742 743 } FT_CharMapRec; 744 745 746 /*************************************************************************/ 747 /*************************************************************************/ 748 /* */ 749 /* B A S E O B J E C T C L A S S E S */ 750 /* */ 751 /*************************************************************************/ 752 /*************************************************************************/ 753 754 755 /*************************************************************************/ 756 /* */ 757 /* <Type> */ 758 /* FT_Face_Internal */ 759 /* */ 760 /* <Description> */ 761 /* An opaque handle to an `FT_Face_InternalRec' structure, used to */ 762 /* model private data of a given @FT_Face object. */ 763 /* */ 764 /* This structure might change between releases of FreeType~2 and is */ 765 /* not generally available to client applications. */ 766 /* */ 767 typedef struct FT_Face_InternalRec_* FT_Face_Internal; 768 769 770 /*************************************************************************/ 771 /* */ 772 /* <Struct> */ 773 /* FT_FaceRec */ 774 /* */ 775 /* <Description> */ 776 /* FreeType root face class structure. A face object models a */ 777 /* typeface in a font file. */ 778 /* */ 779 /* <Fields> */ 780 /* num_faces :: The number of faces in the font file. Some */ 781 /* font formats can have multiple faces in */ 782 /* a font file. */ 783 /* */ 784 /* face_index :: The index of the face in the font file. It */ 785 /* is set to~0 if there is only one face in */ 786 /* the font file. */ 787 /* */ 788 /* face_flags :: A set of bit flags that give important */ 789 /* information about the face; see */ 790 /* @FT_FACE_FLAG_XXX for the details. */ 791 /* */ 792 /* style_flags :: A set of bit flags indicating the style of */ 793 /* the face; see @FT_STYLE_FLAG_XXX for the */ 794 /* details. */ 795 /* */ 796 /* num_glyphs :: The number of glyphs in the face. If the */ 797 /* face is scalable and has sbits (see */ 798 /* `num_fixed_sizes'), it is set to the number */ 799 /* of outline glyphs. */ 800 /* */ 801 /* For CID-keyed fonts, this value gives the */ 802 /* highest CID used in the font. */ 803 /* */ 804 /* family_name :: The face's family name. This is an ASCII */ 805 /* string, usually in English, which describes */ 806 /* the typeface's family (like `Times New */ 807 /* Roman', `Bodoni', `Garamond', etc). This */ 808 /* is a least common denominator used to list */ 809 /* fonts. Some formats (TrueType & OpenType) */ 810 /* provide localized and Unicode versions of */ 811 /* this string. Applications should use the */ 812 /* format specific interface to access them. */ 813 /* Can be NULL (e.g., in fonts embedded in a */ 814 /* PDF file). */ 815 /* */ 816 /* style_name :: The face's style name. This is an ASCII */ 817 /* string, usually in English, which describes */ 818 /* the typeface's style (like `Italic', */ 819 /* `Bold', `Condensed', etc). Not all font */ 820 /* formats provide a style name, so this field */ 821 /* is optional, and can be set to NULL. As */ 822 /* for `family_name', some formats provide */ 823 /* localized and Unicode versions of this */ 824 /* string. Applications should use the format */ 825 /* specific interface to access them. */ 826 /* */ 827 /* num_fixed_sizes :: The number of bitmap strikes in the face. */ 828 /* Even if the face is scalable, there might */ 829 /* still be bitmap strikes, which are called */ 830 /* `sbits' in that case. */ 831 /* */ 832 /* available_sizes :: An array of @FT_Bitmap_Size for all bitmap */ 833 /* strikes in the face. It is set to NULL if */ 834 /* there is no bitmap strike. */ 835 /* */ 836 /* num_charmaps :: The number of charmaps in the face. */ 837 /* */ 838 /* charmaps :: An array of the charmaps of the face. */ 839 /* */ 840 /* generic :: A field reserved for client uses. See the */ 841 /* @FT_Generic type description. */ 842 /* */ 843 /* bbox :: The font bounding box. Coordinates are */ 844 /* expressed in font units (see */ 845 /* `units_per_EM'). The box is large enough */ 846 /* to contain any glyph from the font. Thus, */ 847 /* `bbox.yMax' can be seen as the `maximal */ 848 /* ascender', and `bbox.yMin' as the `minimal */ 849 /* descender'. Only relevant for scalable */ 850 /* formats. */ 851 /* */ 852 /* Note that the bounding box might be off by */ 853 /* (at least) one pixel for hinted fonts. See */ 854 /* @FT_Size_Metrics for further discussion. */ 855 /* */ 856 /* units_per_EM :: The number of font units per EM square for */ 857 /* this face. This is typically 2048 for */ 858 /* TrueType fonts, and 1000 for Type~1 fonts. */ 859 /* Only relevant for scalable formats. */ 860 /* */ 861 /* ascender :: The typographic ascender of the face, */ 862 /* expressed in font units. For font formats */ 863 /* not having this information, it is set to */ 864 /* `bbox.yMax'. Only relevant for scalable */ 865 /* formats. */ 866 /* */ 867 /* descender :: The typographic descender of the face, */ 868 /* expressed in font units. For font formats */ 869 /* not having this information, it is set to */ 870 /* `bbox.yMin'. Note that this field is */ 871 /* usually negative. Only relevant for */ 872 /* scalable formats. */ 873 /* */ 874 /* height :: The height is the vertical distance */ 875 /* between two consecutive baselines, */ 876 /* expressed in font units. It is always */ 877 /* positive. Only relevant for scalable */ 878 /* formats. */ 879 /* */ 880 /* max_advance_width :: The maximal advance width, in font units, */ 881 /* for all glyphs in this face. This can be */ 882 /* used to make word wrapping computations */ 883 /* faster. Only relevant for scalable */ 884 /* formats. */ 885 /* */ 886 /* max_advance_height :: The maximal advance height, in font units, */ 887 /* for all glyphs in this face. This is only */ 888 /* relevant for vertical layouts, and is set */ 889 /* to `height' for fonts that do not provide */ 890 /* vertical metrics. Only relevant for */ 891 /* scalable formats. */ 892 /* */ 893 /* underline_position :: The position, in font units, of the */ 894 /* underline line for this face. It is the */ 895 /* center of the underlining stem. Only */ 896 /* relevant for scalable formats. */ 897 /* */ 898 /* underline_thickness :: The thickness, in font units, of the */ 899 /* underline for this face. Only relevant for */ 900 /* scalable formats. */ 901 /* */ 902 /* glyph :: The face's associated glyph slot(s). */ 903 /* */ 904 /* size :: The current active size for this face. */ 905 /* */ 906 /* charmap :: The current active charmap for this face. */ 907 /* */ 908 /* <Note> */ 909 /* Fields may be changed after a call to @FT_Attach_File or */ 910 /* @FT_Attach_Stream. */ 911 /* */ 912 typedef struct FT_FaceRec_ 913 { 914 FT_Long num_faces; 915 FT_Long face_index; 916 917 FT_Long face_flags; 918 FT_Long style_flags; 919 920 FT_Long num_glyphs; 921 922 FT_String* family_name; 923 FT_String* style_name; 924 925 FT_Int num_fixed_sizes; 926 FT_Bitmap_Size* available_sizes; 927 928 FT_Int num_charmaps; 929 FT_CharMap* charmaps; 930 931 FT_Generic generic; 932 933 /*# The following member variables (down to `underline_thickness') */ 934 /*# are only relevant to scalable outlines; cf. @FT_Bitmap_Size */ 935 /*# for bitmap fonts. */ 936 FT_BBox bbox; 937 938 FT_UShort units_per_EM; 939 FT_Short ascender; 940 FT_Short descender; 941 FT_Short height; 942 943 FT_Short max_advance_width; 944 FT_Short max_advance_height; 945 946 FT_Short underline_position; 947 FT_Short underline_thickness; 948 949 FT_GlyphSlot glyph; 950 FT_Size size; 951 FT_CharMap charmap; 952 953 /*@private begin */ 954 955 FT_Driver driver; 956 FT_Memory memory; 957 FT_Stream stream; 958 959 FT_ListRec sizes_list; 960 961 FT_Generic autohint; /* face-specific auto-hinter data */ 962 void* extensions; /* unused */ 963 964 FT_Face_Internal internal; 965 966 /*@private end */ 967 968 } FT_FaceRec; 969 970 971 /*************************************************************************/ 972 /* */ 973 /* <Enum> */ 974 /* FT_FACE_FLAG_XXX */ 975 /* */ 976 /* <Description> */ 977 /* A list of bit flags used in the `face_flags' field of the */ 978 /* @FT_FaceRec structure. They inform client applications of */ 979 /* properties of the corresponding face. */ 980 /* */ 981 /* <Values> */ 982 /* FT_FACE_FLAG_SCALABLE :: */ 983 /* Indicates that the face contains outline glyphs. This doesn't */ 984 /* prevent bitmap strikes, i.e., a face can have both this and */ 985 /* and @FT_FACE_FLAG_FIXED_SIZES set. */ 986 /* */ 987 /* FT_FACE_FLAG_FIXED_SIZES :: */ 988 /* Indicates that the face contains bitmap strikes. See also the */ 989 /* `num_fixed_sizes' and `available_sizes' fields of @FT_FaceRec. */ 990 /* */ 991 /* FT_FACE_FLAG_FIXED_WIDTH :: */ 992 /* Indicates that the face contains fixed-width characters (like */ 993 /* Courier, Lucido, MonoType, etc.). */ 994 /* */ 995 /* FT_FACE_FLAG_SFNT :: */ 996 /* Indicates that the face uses the `sfnt' storage scheme. For */ 997 /* now, this means TrueType and OpenType. */ 998 /* */ 999 /* FT_FACE_FLAG_HORIZONTAL :: */ 1000 /* Indicates that the face contains horizontal glyph metrics. This */ 1001 /* should be set for all common formats. */ 1002 /* */ 1003 /* FT_FACE_FLAG_VERTICAL :: */ 1004 /* Indicates that the face contains vertical glyph metrics. This */ 1005 /* is only available in some formats, not all of them. */ 1006 /* */ 1007 /* FT_FACE_FLAG_KERNING :: */ 1008 /* Indicates that the face contains kerning information. If set, */ 1009 /* the kerning distance can be retrieved through the function */ 1010 /* @FT_Get_Kerning. Otherwise the function always return the */ 1011 /* vector (0,0). Note that FreeType doesn't handle kerning data */ 1012 /* from the `GPOS' table (as present in some OpenType fonts). */ 1013 /* */ 1014 /* FT_FACE_FLAG_FAST_GLYPHS :: */ 1015 /* THIS FLAG IS DEPRECATED. DO NOT USE OR TEST IT. */ 1016 /* */ 1017 /* FT_FACE_FLAG_MULTIPLE_MASTERS :: */ 1018 /* Indicates that the font contains multiple masters and is capable */ 1019 /* of interpolating between them. See the multiple-masters */ 1020 /* specific API for details. */ 1021 /* */ 1022 /* FT_FACE_FLAG_GLYPH_NAMES :: */ 1023 /* Indicates that the font contains glyph names that can be */ 1024 /* retrieved through @FT_Get_Glyph_Name. Note that some TrueType */ 1025 /* fonts contain broken glyph name tables. Use the function */ 1026 /* @FT_Has_PS_Glyph_Names when needed. */ 1027 /* */ 1028 /* FT_FACE_FLAG_EXTERNAL_STREAM :: */ 1029 /* Used internally by FreeType to indicate that a face's stream was */ 1030 /* provided by the client application and should not be destroyed */ 1031 /* when @FT_Done_Face is called. Don't read or test this flag. */ 1032 /* */ 1033 /* FT_FACE_FLAG_HINTER :: */ 1034 /* Set if the font driver has a hinting machine of its own. For */ 1035 /* example, with TrueType fonts, it makes sense to use data from */ 1036 /* the SFNT `gasp' table only if the native TrueType hinting engine */ 1037 /* (with the bytecode interpreter) is available and active. */ 1038 /* */ 1039 /* FT_FACE_FLAG_CID_KEYED :: */ 1040 /* Set if the font is CID-keyed. In that case, the font is not */ 1041 /* accessed by glyph indices but by CID values. For subsetted */ 1042 /* CID-keyed fonts this has the consequence that not all index */ 1043 /* values are a valid argument to FT_Load_Glyph. Only the CID */ 1044 /* values for which corresponding glyphs in the subsetted font */ 1045 /* exist make FT_Load_Glyph return successfully; in all other cases */ 1046 /* you get an `FT_Err_Invalid_Argument' error. */ 1047 /* */ 1048 /* Note that CID-keyed fonts which are in an SFNT wrapper don't */ 1049 /* have this flag set since the glyphs are accessed in the normal */ 1050 /* way (using contiguous indices); the `CID-ness' isn't visible to */ 1051 /* the application. */ 1052 /* */ 1053 /* FT_FACE_FLAG_TRICKY :: */ 1054 /* Set if the font is `tricky', this is, it always needs the */ 1055 /* font format's native hinting engine to get a reasonable result. */ 1056 /* A typical example is the Chinese font `mingli.ttf' which uses */ 1057 /* TrueType bytecode instructions to move and scale all of its */ 1058 /* subglyphs. */ 1059 /* */ 1060 /* It is not possible to autohint such fonts using */ 1061 /* @FT_LOAD_FORCE_AUTOHINT; it will also ignore */ 1062 /* @FT_LOAD_NO_HINTING. You have to set both @FT_LOAD_NO_HINTING */ 1063 /* and @FT_LOAD_NO_AUTOHINT to really disable hinting; however, you */ 1064 /* probably never want this except for demonstration purposes. */ 1065 /* */ 1066 /* Currently, there are about a dozen TrueType fonts in the list of */ 1067 /* tricky fonts; they are hard-coded in file `ttobjs.c'. */ 1068 /* */ 1069#define FT_FACE_FLAG_SCALABLE ( 1L << 0 ) 1070#define FT_FACE_FLAG_FIXED_SIZES ( 1L << 1 ) 1071#define FT_FACE_FLAG_FIXED_WIDTH ( 1L << 2 ) 1072#define FT_FACE_FLAG_SFNT ( 1L << 3 ) 1073#define FT_FACE_FLAG_HORIZONTAL ( 1L << 4 ) 1074#define FT_FACE_FLAG_VERTICAL ( 1L << 5 ) 1075#define FT_FACE_FLAG_KERNING ( 1L << 6 ) 1076#define FT_FACE_FLAG_FAST_GLYPHS ( 1L << 7 ) 1077#define FT_FACE_FLAG_MULTIPLE_MASTERS ( 1L << 8 ) 1078#define FT_FACE_FLAG_GLYPH_NAMES ( 1L << 9 ) 1079#define FT_FACE_FLAG_EXTERNAL_STREAM ( 1L << 10 ) 1080#define FT_FACE_FLAG_HINTER ( 1L << 11 ) 1081#define FT_FACE_FLAG_CID_KEYED ( 1L << 12 ) 1082#define FT_FACE_FLAG_TRICKY ( 1L << 13 ) 1083 1084 1085 /************************************************************************* 1086 * 1087 * @macro: 1088 * FT_HAS_HORIZONTAL( face ) 1089 * 1090 * @description: 1091 * A macro that returns true whenever a face object contains 1092 * horizontal metrics (this is true for all font formats though). 1093 * 1094 * @also: 1095 * @FT_HAS_VERTICAL can be used to check for vertical metrics. 1096 * 1097 */ 1098#define FT_HAS_HORIZONTAL( face ) \ 1099 ( face->face_flags & FT_FACE_FLAG_HORIZONTAL ) 1100 1101 1102 /************************************************************************* 1103 * 1104 * @macro: 1105 * FT_HAS_VERTICAL( face ) 1106 * 1107 * @description: 1108 * A macro that returns true whenever a face object contains vertical 1109 * metrics. 1110 * 1111 */ 1112#define FT_HAS_VERTICAL( face ) \ 1113 ( face->face_flags & FT_FACE_FLAG_VERTICAL ) 1114 1115 1116 /************************************************************************* 1117 * 1118 * @macro: 1119 * FT_HAS_KERNING( face ) 1120 * 1121 * @description: 1122 * A macro that returns true whenever a face object contains kerning 1123 * data that can be accessed with @FT_Get_Kerning. 1124 * 1125 */ 1126#define FT_HAS_KERNING( face ) \ 1127 ( face->face_flags & FT_FACE_FLAG_KERNING ) 1128 1129 1130 /************************************************************************* 1131 * 1132 * @macro: 1133 * FT_IS_SCALABLE( face ) 1134 * 1135 * @description: 1136 * A macro that returns true whenever a face object contains a scalable 1137 * font face (true for TrueType, Type~1, Type~42, CID, OpenType/CFF, 1138 * and PFR font formats. 1139 * 1140 */ 1141#define FT_IS_SCALABLE( face ) \ 1142 ( face->face_flags & FT_FACE_FLAG_SCALABLE ) 1143 1144 1145 /************************************************************************* 1146 * 1147 * @macro: 1148 * FT_IS_SFNT( face ) 1149 * 1150 * @description: 1151 * A macro that returns true whenever a face object contains a font 1152 * whose format is based on the SFNT storage scheme. This usually 1153 * means: TrueType fonts, OpenType fonts, as well as SFNT-based embedded 1154 * bitmap fonts. 1155 * 1156 * If this macro is true, all functions defined in @FT_SFNT_NAMES_H and 1157 * @FT_TRUETYPE_TABLES_H are available. 1158 * 1159 */ 1160#define FT_IS_SFNT( face ) \ 1161 ( face->face_flags & FT_FACE_FLAG_SFNT ) 1162 1163 1164 /************************************************************************* 1165 * 1166 * @macro: 1167 * FT_IS_FIXED_WIDTH( face ) 1168 * 1169 * @description: 1170 * A macro that returns true whenever a face object contains a font face 1171 * that contains fixed-width (or `monospace', `fixed-pitch', etc.) 1172 * glyphs. 1173 * 1174 */ 1175#define FT_IS_FIXED_WIDTH( face ) \ 1176 ( face->face_flags & FT_FACE_FLAG_FIXED_WIDTH ) 1177 1178 1179 /************************************************************************* 1180 * 1181 * @macro: 1182 * FT_HAS_FIXED_SIZES( face ) 1183 * 1184 * @description: 1185 * A macro that returns true whenever a face object contains some 1186 * embedded bitmaps. See the `available_sizes' field of the 1187 * @FT_FaceRec structure. 1188 * 1189 */ 1190#define FT_HAS_FIXED_SIZES( face ) \ 1191 ( face->face_flags & FT_FACE_FLAG_FIXED_SIZES ) 1192 1193 1194 /************************************************************************* 1195 * 1196 * @macro: 1197 * FT_HAS_FAST_GLYPHS( face ) 1198 * 1199 * @description: 1200 * Deprecated. 1201 * 1202 */ 1203#define FT_HAS_FAST_GLYPHS( face ) 0 1204 1205 1206 /************************************************************************* 1207 * 1208 * @macro: 1209 * FT_HAS_GLYPH_NAMES( face ) 1210 * 1211 * @description: 1212 * A macro that returns true whenever a face object contains some glyph 1213 * names that can be accessed through @FT_Get_Glyph_Name. 1214 * 1215 */ 1216#define FT_HAS_GLYPH_NAMES( face ) \ 1217 ( face->face_flags & FT_FACE_FLAG_GLYPH_NAMES ) 1218 1219 1220 /************************************************************************* 1221 * 1222 * @macro: 1223 * FT_HAS_MULTIPLE_MASTERS( face ) 1224 * 1225 * @description: 1226 * A macro that returns true whenever a face object contains some 1227 * multiple masters. The functions provided by @FT_MULTIPLE_MASTERS_H 1228 * are then available to choose the exact design you want. 1229 * 1230 */ 1231#define FT_HAS_MULTIPLE_MASTERS( face ) \ 1232 ( face->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS ) 1233 1234 1235 /************************************************************************* 1236 * 1237 * @macro: 1238 * FT_IS_CID_KEYED( face ) 1239 * 1240 * @description: 1241 * A macro that returns true whenever a face object contains a CID-keyed 1242 * font. See the discussion of @FT_FACE_FLAG_CID_KEYED for more 1243 * details. 1244 * 1245 * If this macro is true, all functions defined in @FT_CID_H are 1246 * available. 1247 * 1248 */ 1249#define FT_IS_CID_KEYED( face ) \ 1250 ( face->face_flags & FT_FACE_FLAG_CID_KEYED ) 1251 1252 1253 /************************************************************************* 1254 * 1255 * @macro: 1256 * FT_IS_TRICKY( face ) 1257 * 1258 * @description: 1259 * A macro that returns true whenever a face represents a `tricky' font. 1260 * See the discussion of @FT_FACE_FLAG_TRICKY for more details. 1261 * 1262 */ 1263#define FT_IS_TRICKY( face ) \ 1264 ( face->face_flags & FT_FACE_FLAG_TRICKY ) 1265 1266 1267 /*************************************************************************/ 1268 /* */ 1269 /* <Const> */ 1270 /* FT_STYLE_FLAG_XXX */ 1271 /* */ 1272 /* <Description> */ 1273 /* A list of bit-flags used to indicate the style of a given face. */ 1274 /* These are used in the `style_flags' field of @FT_FaceRec. */ 1275 /* */ 1276 /* <Values> */ 1277 /* FT_STYLE_FLAG_ITALIC :: */ 1278 /* Indicates that a given face style is italic or oblique. */ 1279 /* */ 1280 /* FT_STYLE_FLAG_BOLD :: */ 1281 /* Indicates that a given face is bold. */ 1282 /* */ 1283 /* <Note> */ 1284 /* The style information as provided by FreeType is very basic. More */ 1285 /* details are beyond the scope and should be done on a higher level */ 1286 /* (for example, by analyzing various fields of the `OS/2' table in */ 1287 /* SFNT based fonts). */ 1288 /* */ 1289#define FT_STYLE_FLAG_ITALIC ( 1 << 0 ) 1290#define FT_STYLE_FLAG_BOLD ( 1 << 1 ) 1291 1292 1293 /*************************************************************************/ 1294 /* */ 1295 /* <Type> */ 1296 /* FT_Size_Internal */ 1297 /* */ 1298 /* <Description> */ 1299 /* An opaque handle to an `FT_Size_InternalRec' structure, used to */ 1300 /* model private data of a given @FT_Size object. */ 1301 /* */ 1302 typedef struct FT_Size_InternalRec_* FT_Size_Internal; 1303 1304 1305 /*************************************************************************/ 1306 /* */ 1307 /* <Struct> */ 1308 /* FT_Size_Metrics */ 1309 /* */ 1310 /* <Description> */ 1311 /* The size metrics structure gives the metrics of a size object. */ 1312 /* */ 1313 /* <Fields> */ 1314 /* x_ppem :: The width of the scaled EM square in pixels, hence */ 1315 /* the term `ppem' (pixels per EM). It is also */ 1316 /* referred to as `nominal width'. */ 1317 /* */ 1318 /* y_ppem :: The height of the scaled EM square in pixels, */ 1319 /* hence the term `ppem' (pixels per EM). It is also */ 1320 /* referred to as `nominal height'. */ 1321 /* */ 1322 /* x_scale :: A 16.16 fractional scaling value used to convert */ 1323 /* horizontal metrics from font units to 26.6 */ 1324 /* fractional pixels. Only relevant for scalable */ 1325 /* font formats. */ 1326 /* */ 1327 /* y_scale :: A 16.16 fractional scaling value used to convert */ 1328 /* vertical metrics from font units to 26.6 */ 1329 /* fractional pixels. Only relevant for scalable */ 1330 /* font formats. */ 1331 /* */ 1332 /* ascender :: The ascender in 26.6 fractional pixels. See */ 1333 /* @FT_FaceRec for the details. */ 1334 /* */ 1335 /* descender :: The descender in 26.6 fractional pixels. See */ 1336 /* @FT_FaceRec for the details. */ 1337 /* */ 1338 /* height :: The height in 26.6 fractional pixels. See */ 1339 /* @FT_FaceRec for the details. */ 1340 /* */ 1341 /* max_advance :: The maximal advance width in 26.6 fractional */ 1342 /* pixels. See @FT_FaceRec for the details. */ 1343 /* */ 1344 /* <Note> */ 1345 /* The scaling values, if relevant, are determined first during a */ 1346 /* size changing operation. The remaining fields are then set by the */ 1347 /* driver. For scalable formats, they are usually set to scaled */ 1348 /* values of the corresponding fields in @FT_FaceRec. */ 1349 /* */ 1350 /* Note that due to glyph hinting, these values might not be exact */ 1351 /* for certain fonts. Thus they must be treated as unreliable */ 1352 /* with an error margin of at least one pixel! */ 1353 /* */ 1354 /* Indeed, the only way to get the exact metrics is to render _all_ */ 1355 /* glyphs. As this would be a definite performance hit, it is up to */ 1356 /* client applications to perform such computations. */ 1357 /* */ 1358 /* The FT_Size_Metrics structure is valid for bitmap fonts also. */ 1359 /* */ 1360 typedef struct FT_Size_Metrics_ 1361 { 1362 FT_UShort x_ppem; /* horizontal pixels per EM */ 1363 FT_UShort y_ppem; /* vertical pixels per EM */ 1364 1365 FT_Fixed x_scale; /* scaling values used to convert font */ 1366 FT_Fixed y_scale; /* units to 26.6 fractional pixels */ 1367 1368 FT_Pos ascender; /* ascender in 26.6 frac. pixels */ 1369 FT_Pos descender; /* descender in 26.6 frac. pixels */ 1370 FT_Pos height; /* text height in 26.6 frac. pixels */ 1371 FT_Pos max_advance; /* max horizontal advance, in 26.6 pixels */ 1372 1373 } FT_Size_Metrics; 1374 1375 1376 /*************************************************************************/ 1377 /* */ 1378 /* <Struct> */ 1379 /* FT_SizeRec */ 1380 /* */ 1381 /* <Description> */ 1382 /* FreeType root size class structure. A size object models a face */ 1383 /* object at a given size. */ 1384 /* */ 1385 /* <Fields> */ 1386 /* face :: Handle to the parent face object. */ 1387 /* */ 1388 /* generic :: A typeless pointer, which is unused by the FreeType */ 1389 /* library or any of its drivers. It can be used by */ 1390 /* client applications to link their own data to each size */ 1391 /* object. */ 1392 /* */ 1393 /* metrics :: Metrics for this size object. This field is read-only. */ 1394 /* */ 1395 typedef struct FT_SizeRec_ 1396 { 1397 FT_Face face; /* parent face object */ 1398 FT_Generic generic; /* generic pointer for client uses */ 1399 FT_Size_Metrics metrics; /* size metrics */ 1400 FT_Size_Internal internal; 1401 1402 } FT_SizeRec; 1403 1404 1405 /*************************************************************************/ 1406 /* */ 1407 /* <Struct> */ 1408 /* FT_SubGlyph */ 1409 /* */ 1410 /* <Description> */ 1411 /* The subglyph structure is an internal object used to describe */ 1412 /* subglyphs (for example, in the case of composites). */ 1413 /* */ 1414 /* <Note> */ 1415 /* The subglyph implementation is not part of the high-level API, */ 1416 /* hence the forward structure declaration. */ 1417 /* */ 1418 /* You can however retrieve subglyph information with */ 1419 /* @FT_Get_SubGlyph_Info. */ 1420 /* */ 1421 typedef struct FT_SubGlyphRec_* FT_SubGlyph; 1422 1423 1424 /*************************************************************************/ 1425 /* */ 1426 /* <Type> */ 1427 /* FT_Slot_Internal */ 1428 /* */ 1429 /* <Description> */ 1430 /* An opaque handle to an `FT_Slot_InternalRec' structure, used to */ 1431 /* model private data of a given @FT_GlyphSlot object. */ 1432 /* */ 1433 typedef struct FT_Slot_InternalRec_* FT_Slot_Internal; 1434 1435 1436 /*************************************************************************/ 1437 /* */ 1438 /* <Struct> */ 1439 /* FT_GlyphSlotRec */ 1440 /* */ 1441 /* <Description> */ 1442 /* FreeType root glyph slot class structure. A glyph slot is a */ 1443 /* container where individual glyphs can be loaded, be they in */ 1444 /* outline or bitmap format. */ 1445 /* */ 1446 /* <Fields> */ 1447 /* library :: A handle to the FreeType library instance */ 1448 /* this slot belongs to. */ 1449 /* */ 1450 /* face :: A handle to the parent face object. */ 1451 /* */ 1452 /* next :: In some cases (like some font tools), several */ 1453 /* glyph slots per face object can be a good */ 1454 /* thing. As this is rare, the glyph slots are */ 1455 /* listed through a direct, single-linked list */ 1456 /* using its `next' field. */ 1457 /* */ 1458 /* generic :: A typeless pointer which is unused by the */ 1459 /* FreeType library or any of its drivers. It */ 1460 /* can be used by client applications to link */ 1461 /* their own data to each glyph slot object. */ 1462 /* */ 1463 /* metrics :: The metrics of the last loaded glyph in the */ 1464 /* slot. The returned values depend on the last */ 1465 /* load flags (see the @FT_Load_Glyph API */ 1466 /* function) and can be expressed either in 26.6 */ 1467 /* fractional pixels or font units. */ 1468 /* */ 1469 /* Note that even when the glyph image is */ 1470 /* transformed, the metrics are not. */ 1471 /* */ 1472 /* linearHoriAdvance :: The advance width of the unhinted glyph. */ 1473 /* Its value is expressed in 16.16 fractional */ 1474 /* pixels, unless @FT_LOAD_LINEAR_DESIGN is set */ 1475 /* when loading the glyph. This field can be */ 1476 /* important to perform correct WYSIWYG layout. */ 1477 /* Only relevant for outline glyphs. */ 1478 /* */ 1479 /* linearVertAdvance :: The advance height of the unhinted glyph. */ 1480 /* Its value is expressed in 16.16 fractional */ 1481 /* pixels, unless @FT_LOAD_LINEAR_DESIGN is set */ 1482 /* when loading the glyph. This field can be */ 1483 /* important to perform correct WYSIWYG layout. */ 1484 /* Only relevant for outline glyphs. */ 1485 /* */ 1486 /* advance :: This shorthand is, depending on */ 1487 /* @FT_LOAD_IGNORE_TRANSFORM, the transformed */ 1488 /* advance width for the glyph (in 26.6 */ 1489 /* fractional pixel format). As specified with */ 1490 /* @FT_LOAD_VERTICAL_LAYOUT, it uses either the */ 1491 /* `horiAdvance' or the `vertAdvance' value of */ 1492 /* `metrics' field. */ 1493 /* */ 1494 /* format :: This field indicates the format of the image */ 1495 /* contained in the glyph slot. Typically */ 1496 /* @FT_GLYPH_FORMAT_BITMAP, */ 1497 /* @FT_GLYPH_FORMAT_OUTLINE, or */ 1498 /* @FT_GLYPH_FORMAT_COMPOSITE, but others are */ 1499 /* possible. */ 1500 /* */ 1501 /* bitmap :: This field is used as a bitmap descriptor */ 1502 /* when the slot format is */ 1503 /* @FT_GLYPH_FORMAT_BITMAP. Note that the */ 1504 /* address and content of the bitmap buffer can */ 1505 /* change between calls of @FT_Load_Glyph and a */ 1506 /* few other functions. */ 1507 /* */ 1508 /* bitmap_left :: This is the bitmap's left bearing expressed */ 1509 /* in integer pixels. Of course, this is only */ 1510 /* valid if the format is */ 1511 /* @FT_GLYPH_FORMAT_BITMAP. */ 1512 /* */ 1513 /* bitmap_top :: This is the bitmap's top bearing expressed in */ 1514 /* integer pixels. Remember that this is the */ 1515 /* distance from the baseline to the top-most */ 1516 /* glyph scanline, upwards y~coordinates being */ 1517 /* *positive*. */ 1518 /* */ 1519 /* outline :: The outline descriptor for the current glyph */ 1520 /* image if its format is */ 1521 /* @FT_GLYPH_FORMAT_OUTLINE. Once a glyph is */ 1522 /* loaded, `outline' can be transformed, */ 1523 /* distorted, embolded, etc. However, it must */ 1524 /* not be freed. */ 1525 /* */ 1526 /* num_subglyphs :: The number of subglyphs in a composite glyph. */ 1527 /* This field is only valid for the composite */ 1528 /* glyph format that should normally only be */ 1529 /* loaded with the @FT_LOAD_NO_RECURSE flag. */ 1530 /* For now this is internal to FreeType. */ 1531 /* */ 1532 /* subglyphs :: An array of subglyph descriptors for */ 1533 /* composite glyphs. There are `num_subglyphs' */ 1534 /* elements in there. Currently internal to */ 1535 /* FreeType. */ 1536 /* */ 1537 /* control_data :: Certain font drivers can also return the */ 1538 /* control data for a given glyph image (e.g. */ 1539 /* TrueType bytecode, Type~1 charstrings, etc.). */ 1540 /* This field is a pointer to such data. */ 1541 /* */ 1542 /* control_len :: This is the length in bytes of the control */ 1543 /* data. */ 1544 /* */ 1545 /* other :: Really wicked formats can use this pointer to */ 1546 /* present their own glyph image to client */ 1547 /* applications. Note that the application */ 1548 /* needs to know about the image format. */ 1549 /* */ 1550 /* lsb_delta :: The difference between hinted and unhinted */ 1551 /* left side bearing while autohinting is */ 1552 /* active. Zero otherwise. */ 1553 /* */ 1554 /* rsb_delta :: The difference between hinted and unhinted */ 1555 /* right side bearing while autohinting is */ 1556 /* active. Zero otherwise. */ 1557 /* */ 1558 /* <Note> */ 1559 /* If @FT_Load_Glyph is called with default flags (see */ 1560 /* @FT_LOAD_DEFAULT) the glyph image is loaded in the glyph slot in */ 1561 /* its native format (e.g., an outline glyph for TrueType and Type~1 */ 1562 /* formats). */ 1563 /* */ 1564 /* This image can later be converted into a bitmap by calling */ 1565 /* @FT_Render_Glyph. This function finds the current renderer for */ 1566 /* the native image's format, then invokes it. */ 1567 /* */ 1568 /* The renderer is in charge of transforming the native image through */ 1569 /* the slot's face transformation fields, then converting it into a */ 1570 /* bitmap that is returned in `slot->bitmap'. */ 1571 /* */ 1572 /* Note that `slot->bitmap_left' and `slot->bitmap_top' are also used */ 1573 /* to specify the position of the bitmap relative to the current pen */ 1574 /* position (e.g., coordinates (0,0) on the baseline). Of course, */ 1575 /* `slot->format' is also changed to @FT_GLYPH_FORMAT_BITMAP. */ 1576 /* */ 1577 /* <Note> */ 1578 /* Here a small pseudo code fragment which shows how to use */ 1579 /* `lsb_delta' and `rsb_delta': */ 1580 /* */ 1581 /* { */ 1582 /* FT_Pos origin_x = 0; */ 1583 /* FT_Pos prev_rsb_delta = 0; */ 1584 /* */ 1585 /* */ 1586 /* for all glyphs do */ 1587 /* <compute kern between current and previous glyph and add it to */ 1588 /* `origin_x'> */ 1589 /* */ 1590 /* <load glyph with `FT_Load_Glyph'> */ 1591 /* */ 1592 /* if ( prev_rsb_delta - face->glyph->lsb_delta >= 32 ) */ 1593 /* origin_x -= 64; */ 1594 /* else if ( prev_rsb_delta - face->glyph->lsb_delta < -32 ) */ 1595 /* origin_x += 64; */ 1596 /* */ 1597 /* prev_rsb_delta = face->glyph->rsb_delta; */ 1598 /* */ 1599 /* <save glyph image, or render glyph, or ...> */ 1600 /* */ 1601 /* origin_x += face->glyph->advance.x; */ 1602 /* endfor */ 1603 /* } */ 1604 /* */ 1605 typedef struct FT_GlyphSlotRec_ 1606 { 1607 FT_Library library; 1608 FT_Face face; 1609 FT_GlyphSlot next; 1610 FT_UInt reserved; /* retained for binary compatibility */ 1611 FT_Generic generic; 1612 1613 FT_Glyph_Metrics metrics; 1614 FT_Fixed linearHoriAdvance; 1615 FT_Fixed linearVertAdvance; 1616 FT_Vector advance; 1617 1618 FT_Glyph_Format format; 1619 1620 FT_Bitmap bitmap; 1621 FT_Int bitmap_left; 1622 FT_Int bitmap_top; 1623 1624 FT_Outline outline; 1625 1626 FT_UInt num_subglyphs; 1627 FT_SubGlyph subglyphs; 1628 1629 void* control_data; 1630 long control_len; 1631 1632 FT_Pos lsb_delta; 1633 FT_Pos rsb_delta; 1634 1635 void* other; 1636 1637 FT_Slot_Internal internal; 1638 1639 } FT_GlyphSlotRec; 1640 1641 1642 /*************************************************************************/ 1643 /*************************************************************************/ 1644 /* */ 1645 /* F U N C T I O N S */ 1646 /* */ 1647 /*************************************************************************/ 1648 /*************************************************************************/ 1649 1650 1651 /*************************************************************************/ 1652 /* */ 1653 /* <Function> */ 1654 /* FT_Init_FreeType */ 1655 /* */ 1656 /* <Description> */ 1657 /* Initialize a new FreeType library object. The set of modules */ 1658 /* that are registered by this function is determined at build time. */ 1659 /* */ 1660 /* <Output> */ 1661 /* alibrary :: A handle to a new library object. */ 1662 /* */ 1663 /* <Return> */ 1664 /* FreeType error code. 0~means success. */ 1665 /* */ 1666 /* <Note> */ 1667 /* In case you want to provide your own memory allocating routines, */ 1668 /* use @FT_New_Library instead, followed by a call to */ 1669 /* @FT_Add_Default_Modules (or a series of calls to @FT_Add_Module). */ 1670 /* */ 1671 /* For multi-threading applications each thread should have its own */ 1672 /* FT_Library object. */ 1673 /* */ 1674 FT_EXPORT( FT_Error ) 1675 FT_Init_FreeType( FT_Library *alibrary ); 1676 1677 1678 /*************************************************************************/ 1679 /* */ 1680 /* <Function> */ 1681 /* FT_Done_FreeType */ 1682 /* */ 1683 /* <Description> */ 1684 /* Destroy a given FreeType library object and all of its children, */ 1685 /* including resources, drivers, faces, sizes, etc. */ 1686 /* */ 1687 /* <Input> */ 1688 /* library :: A handle to the target library object. */ 1689 /* */ 1690 /* <Return> */ 1691 /* FreeType error code. 0~means success. */ 1692 /* */ 1693 FT_EXPORT( FT_Error ) 1694 FT_Done_FreeType( FT_Library library ); 1695 1696 1697 /*************************************************************************/ 1698 /* */ 1699 /* <Enum> */ 1700 /* FT_OPEN_XXX */ 1701 /* */ 1702 /* <Description> */ 1703 /* A list of bit-field constants used within the `flags' field of the */ 1704 /* @FT_Open_Args structure. */ 1705 /* */ 1706 /* <Values> */ 1707 /* FT_OPEN_MEMORY :: This is a memory-based stream. */ 1708 /* */ 1709 /* FT_OPEN_STREAM :: Copy the stream from the `stream' field. */ 1710 /* */ 1711 /* FT_OPEN_PATHNAME :: Create a new input stream from a C~path */ 1712 /* name. */ 1713 /* */ 1714 /* FT_OPEN_DRIVER :: Use the `driver' field. */ 1715 /* */ 1716 /* FT_OPEN_PARAMS :: Use the `num_params' and `params' fields. */ 1717 /* */ 1718 /* ft_open_memory :: Deprecated; use @FT_OPEN_MEMORY instead. */ 1719 /* */ 1720 /* ft_open_stream :: Deprecated; use @FT_OPEN_STREAM instead. */ 1721 /* */ 1722 /* ft_open_pathname :: Deprecated; use @FT_OPEN_PATHNAME instead. */ 1723 /* */ 1724 /* ft_open_driver :: Deprecated; use @FT_OPEN_DRIVER instead. */ 1725 /* */ 1726 /* ft_open_params :: Deprecated; use @FT_OPEN_PARAMS instead. */ 1727 /* */ 1728 /* <Note> */ 1729 /* The `FT_OPEN_MEMORY', `FT_OPEN_STREAM', and `FT_OPEN_PATHNAME' */ 1730 /* flags are mutually exclusive. */ 1731 /* */ 1732#define FT_OPEN_MEMORY 0x1 1733#define FT_OPEN_STREAM 0x2 1734#define FT_OPEN_PATHNAME 0x4 1735#define FT_OPEN_DRIVER 0x8 1736#define FT_OPEN_PARAMS 0x10 1737 1738#define ft_open_memory FT_OPEN_MEMORY /* deprecated */ 1739#define ft_open_stream FT_OPEN_STREAM /* deprecated */ 1740#define ft_open_pathname FT_OPEN_PATHNAME /* deprecated */ 1741#define ft_open_driver FT_OPEN_DRIVER /* deprecated */ 1742#define ft_open_params FT_OPEN_PARAMS /* deprecated */ 1743 1744 1745 /*************************************************************************/ 1746 /* */ 1747 /* <Struct> */ 1748 /* FT_Parameter */ 1749 /* */ 1750 /* <Description> */ 1751 /* A simple structure used to pass more or less generic parameters to */ 1752 /* @FT_Open_Face. */ 1753 /* */ 1754 /* <Fields> */ 1755 /* tag :: A four-byte identification tag. */ 1756 /* */ 1757 /* data :: A pointer to the parameter data. */ 1758 /* */ 1759 /* <Note> */ 1760 /* The ID and function of parameters are driver-specific. See the */ 1761 /* various FT_PARAM_TAG_XXX flags for more information. */ 1762 /* */ 1763 typedef struct FT_Parameter_ 1764 { 1765 FT_ULong tag; 1766 FT_Pointer data; 1767 1768 } FT_Parameter; 1769 1770 1771 /*************************************************************************/ 1772 /* */ 1773 /* <Struct> */ 1774 /* FT_Open_Args */ 1775 /* */ 1776 /* <Description> */ 1777 /* A structure used to indicate how to open a new font file or */ 1778 /* stream. A pointer to such a structure can be used as a parameter */ 1779 /* for the functions @FT_Open_Face and @FT_Attach_Stream. */ 1780 /* */ 1781 /* <Fields> */ 1782 /* flags :: A set of bit flags indicating how to use the */ 1783 /* structure. */ 1784 /* */ 1785 /* memory_base :: The first byte of the file in memory. */ 1786 /* */ 1787 /* memory_size :: The size in bytes of the file in memory. */ 1788 /* */ 1789 /* pathname :: A pointer to an 8-bit file pathname. */ 1790 /* */ 1791 /* stream :: A handle to a source stream object. */ 1792 /* */ 1793 /* driver :: This field is exclusively used by @FT_Open_Face; */ 1794 /* it simply specifies the font driver to use to open */ 1795 /* the face. If set to~0, FreeType tries to load the */ 1796 /* face with each one of the drivers in its list. */ 1797 /* */ 1798 /* num_params :: The number of extra parameters. */ 1799 /* */ 1800 /* params :: Extra parameters passed to the font driver when */ 1801 /* opening a new face. */ 1802 /* */ 1803 /* <Note> */ 1804 /* The stream type is determined by the contents of `flags' which */ 1805 /* are tested in the following order by @FT_Open_Face: */ 1806 /* */ 1807 /* If the `FT_OPEN_MEMORY' bit is set, assume that this is a */ 1808 /* memory file of `memory_size' bytes, located at `memory_address'. */ 1809 /* The data are are not copied, and the client is responsible for */ 1810 /* releasing and destroying them _after_ the corresponding call to */ 1811 /* @FT_Done_Face. */ 1812 /* */ 1813 /* Otherwise, if the `FT_OPEN_STREAM' bit is set, assume that a */ 1814 /* custom input stream `stream' is used. */ 1815 /* */ 1816 /* Otherwise, if the `FT_OPEN_PATHNAME' bit is set, assume that this */ 1817 /* is a normal file and use `pathname' to open it. */ 1818 /* */ 1819 /* If the `FT_OPEN_DRIVER' bit is set, @FT_Open_Face only tries to */ 1820 /* open the file with the driver whose handler is in `driver'. */ 1821 /* */ 1822 /* If the `FT_OPEN_PARAMS' bit is set, the parameters given by */ 1823 /* `num_params' and `params' is used. They are ignored otherwise. */ 1824 /* */ 1825 /* Ideally, both the `pathname' and `params' fields should be tagged */ 1826 /* as `const'; this is missing for API backwards compatibility. In */ 1827 /* other words, applications should treat them as read-only. */ 1828 /* */ 1829 typedef struct FT_Open_Args_ 1830 { 1831 FT_UInt flags; 1832 const FT_Byte* memory_base; 1833 FT_Long memory_size; 1834 FT_String* pathname; 1835 FT_Stream stream; 1836 FT_Module driver; 1837 FT_Int num_params; 1838 FT_Parameter* params; 1839 1840 } FT_Open_Args; 1841 1842 1843 /*************************************************************************/ 1844 /* */ 1845 /* <Function> */ 1846 /* FT_New_Face */ 1847 /* */ 1848 /* <Description> */ 1849 /* This function calls @FT_Open_Face to open a font by its pathname. */ 1850 /* */ 1851 /* <InOut> */ 1852 /* library :: A handle to the library resource. */ 1853 /* */ 1854 /* <Input> */ 1855 /* pathname :: A path to the font file. */ 1856 /* */ 1857 /* face_index :: The index of the face within the font. The first */ 1858 /* face has index~0. */ 1859 /* */ 1860 /* <Output> */ 1861 /* aface :: A handle to a new face object. If `face_index' is */ 1862 /* greater than or equal to zero, it must be non-NULL. */ 1863 /* See @FT_Open_Face for more details. */ 1864 /* */ 1865 /* <Return> */ 1866 /* FreeType error code. 0~means success. */ 1867 /* */ 1868 FT_EXPORT( FT_Error ) 1869 FT_New_Face( FT_Library library, 1870 const char* filepathname, 1871 FT_Long face_index, 1872 FT_Face *aface ); 1873 1874 1875 /*************************************************************************/ 1876 /* */ 1877 /* <Function> */ 1878 /* FT_New_Memory_Face */ 1879 /* */ 1880 /* <Description> */ 1881 /* This function calls @FT_Open_Face to open a font which has been */ 1882 /* loaded into memory. */ 1883 /* */ 1884 /* <InOut> */ 1885 /* library :: A handle to the library resource. */ 1886 /* */ 1887 /* <Input> */ 1888 /* file_base :: A pointer to the beginning of the font data. */ 1889 /* */ 1890 /* file_size :: The size of the memory chunk used by the font data. */ 1891 /* */ 1892 /* face_index :: The index of the face within the font. The first */ 1893 /* face has index~0. */ 1894 /* */ 1895 /* <Output> */ 1896 /* aface :: A handle to a new face object. If `face_index' is */ 1897 /* greater than or equal to zero, it must be non-NULL. */ 1898 /* See @FT_Open_Face for more details. */ 1899 /* */ 1900 /* <Return> */ 1901 /* FreeType error code. 0~means success. */ 1902 /* */ 1903 /* <Note> */ 1904 /* You must not deallocate the memory before calling @FT_Done_Face. */ 1905 /* */ 1906 FT_EXPORT( FT_Error ) 1907 FT_New_Memory_Face( FT_Library library, 1908 const FT_Byte* file_base, 1909 FT_Long file_size, 1910 FT_Long face_index, 1911 FT_Face *aface ); 1912 1913 1914 /*************************************************************************/ 1915 /* */ 1916 /* <Function> */ 1917 /* FT_Open_Face */ 1918 /* */ 1919 /* <Description> */ 1920 /* Create a face object from a given resource described by */ 1921 /* @FT_Open_Args. */ 1922 /* */ 1923 /* <InOut> */ 1924 /* library :: A handle to the library resource. */ 1925 /* */ 1926 /* <Input> */ 1927 /* args :: A pointer to an `FT_Open_Args' structure which must */ 1928 /* be filled by the caller. */ 1929 /* */ 1930 /* face_index :: The index of the face within the font. The first */ 1931 /* face has index~0. */ 1932 /* */ 1933 /* <Output> */ 1934 /* aface :: A handle to a new face object. If `face_index' is */ 1935 /* greater than or equal to zero, it must be non-NULL. */ 1936 /* See note below. */ 1937 /* */ 1938 /* <Return> */ 1939 /* FreeType error code. 0~means success. */ 1940 /* */ 1941 /* <Note> */ 1942 /* Unlike FreeType 1.x, this function automatically creates a glyph */ 1943 /* slot for the face object which can be accessed directly through */ 1944 /* `face->glyph'. */ 1945 /* */ 1946 /* FT_Open_Face can be used to quickly check whether the font */ 1947 /* format of a given font resource is supported by FreeType. If the */ 1948 /* `face_index' field is negative, the function's return value is~0 */ 1949 /* if the font format is recognized, or non-zero otherwise; */ 1950 /* the function returns a more or less empty face handle in `*aface' */ 1951 /* (if `aface' isn't NULL). The only useful field in this special */ 1952 /* case is `face->num_faces' which gives the number of faces within */ 1953 /* the font file. After examination, the returned @FT_Face structure */ 1954 /* should be deallocated with a call to @FT_Done_Face. */ 1955 /* */ 1956 /* Each new face object created with this function also owns a */ 1957 /* default @FT_Size object, accessible as `face->size'. */ 1958 /* */ 1959 /* One @FT_Library instance can have multiple face objects, this is, */ 1960 /* @FT_Open_Face and its siblings can be called multiple times using */ 1961 /* the same `library' argument. */ 1962 /* */ 1963 /* See the discussion of reference counters in the description of */ 1964 /* @FT_Reference_Face. */ 1965 /* */ 1966 FT_EXPORT( FT_Error ) 1967 FT_Open_Face( FT_Library library, 1968 const FT_Open_Args* args, 1969 FT_Long face_index, 1970 FT_Face *aface ); 1971 1972 1973 /*************************************************************************/ 1974 /* */ 1975 /* <Function> */ 1976 /* FT_Attach_File */ 1977 /* */ 1978 /* <Description> */ 1979 /* This function calls @FT_Attach_Stream to attach a file. */ 1980 /* */ 1981 /* <InOut> */ 1982 /* face :: The target face object. */ 1983 /* */ 1984 /* <Input> */ 1985 /* filepathname :: The pathname. */ 1986 /* */ 1987 /* <Return> */ 1988 /* FreeType error code. 0~means success. */ 1989 /* */ 1990 FT_EXPORT( FT_Error ) 1991 FT_Attach_File( FT_Face face, 1992 const char* filepathname ); 1993 1994 1995 /*************************************************************************/ 1996 /* */ 1997 /* <Function> */ 1998 /* FT_Attach_Stream */ 1999 /* */ 2000 /* <Description> */ 2001 /* `Attach' data to a face object. Normally, this is used to read */ 2002 /* additional information for the face object. For example, you can */ 2003 /* attach an AFM file that comes with a Type~1 font to get the */ 2004 /* kerning values and other metrics. */ 2005 /* */ 2006 /* <InOut> */ 2007 /* face :: The target face object. */ 2008 /* */ 2009 /* <Input> */ 2010 /* parameters :: A pointer to @FT_Open_Args which must be filled by */ 2011 /* the caller. */ 2012 /* */ 2013 /* <Return> */ 2014 /* FreeType error code. 0~means success. */ 2015 /* */ 2016 /* <Note> */ 2017 /* The meaning of the `attach' (i.e., what really happens when the */ 2018 /* new file is read) is not fixed by FreeType itself. It really */ 2019 /* depends on the font format (and thus the font driver). */ 2020 /* */ 2021 /* Client applications are expected to know what they are doing */ 2022 /* when invoking this function. Most drivers simply do not implement */ 2023 /* file attachments. */ 2024 /* */ 2025 FT_EXPORT( FT_Error ) 2026 FT_Attach_Stream( FT_Face face, 2027 FT_Open_Args* parameters ); 2028 2029 2030 /*************************************************************************/ 2031 /* */ 2032 /* <Function> */ 2033 /* FT_Reference_Face */ 2034 /* */ 2035 /* <Description> */ 2036 /* A counter gets initialized to~1 at the time an @FT_Face structure */ 2037 /* is created. This function increments the counter. @FT_Done_Face */ 2038 /* then only destroys a face if the counter is~1, otherwise it simply */ 2039 /* decrements the counter. */ 2040 /* */ 2041 /* This function helps in managing life-cycles of structures which */ 2042 /* reference @FT_Face objects. */ 2043 /* */ 2044 /* <Input> */ 2045 /* face :: A handle to a target face object. */ 2046 /* */ 2047 /* <Return> */ 2048 /* FreeType error code. 0~means success. */ 2049 /* */ 2050 /* <Since> */ 2051 /* 2.4.2 */ 2052 /* */ 2053 FT_EXPORT( FT_Error ) 2054 FT_Reference_Face( FT_Face face ); 2055 2056 2057 /*************************************************************************/ 2058 /* */ 2059 /* <Function> */ 2060 /* FT_Done_Face */ 2061 /* */ 2062 /* <Description> */ 2063 /* Discard a given face object, as well as all of its child slots and */ 2064 /* sizes. */ 2065 /* */ 2066 /* <Input> */ 2067 /* face :: A handle to a target face object. */ 2068 /* */ 2069 /* <Return> */ 2070 /* FreeType error code. 0~means success. */ 2071 /* */ 2072 /* <Note> */ 2073 /* See the discussion of reference counters in the description of */ 2074 /* @FT_Reference_Face. */ 2075 /* */ 2076 FT_EXPORT( FT_Error ) 2077 FT_Done_Face( FT_Face face ); 2078 2079 2080 /*************************************************************************/ 2081 /* */ 2082 /* <Function> */ 2083 /* FT_Select_Size */ 2084 /* */ 2085 /* <Description> */ 2086 /* Select a bitmap strike. */ 2087 /* */ 2088 /* <InOut> */ 2089 /* face :: A handle to a target face object. */ 2090 /* */ 2091 /* <Input> */ 2092 /* strike_index :: The index of the bitmap strike in the */ 2093 /* `available_sizes' field of @FT_FaceRec structure. */ 2094 /* */ 2095 /* <Return> */ 2096 /* FreeType error code. 0~means success. */ 2097 /* */ 2098 FT_EXPORT( FT_Error ) 2099 FT_Select_Size( FT_Face face, 2100 FT_Int strike_index ); 2101 2102 2103 /*************************************************************************/ 2104 /* */ 2105 /* <Enum> */ 2106 /* FT_Size_Request_Type */ 2107 /* */ 2108 /* <Description> */ 2109 /* An enumeration type that lists the supported size request types. */ 2110 /* */ 2111 /* <Values> */ 2112 /* FT_SIZE_REQUEST_TYPE_NOMINAL :: */ 2113 /* The nominal size. The `units_per_EM' field of @FT_FaceRec is */ 2114 /* used to determine both scaling values. */ 2115 /* */ 2116 /* FT_SIZE_REQUEST_TYPE_REAL_DIM :: */ 2117 /* The real dimension. The sum of the the `ascender' and (minus */ 2118 /* of) the `descender' fields of @FT_FaceRec are used to determine */ 2119 /* both scaling values. */ 2120 /* */ 2121 /* FT_SIZE_REQUEST_TYPE_BBOX :: */ 2122 /* The font bounding box. The width and height of the `bbox' field */ 2123 /* of @FT_FaceRec are used to determine the horizontal and vertical */ 2124 /* scaling value, respectively. */ 2125 /* */ 2126 /* FT_SIZE_REQUEST_TYPE_CELL :: */ 2127 /* The `max_advance_width' field of @FT_FaceRec is used to */ 2128 /* determine the horizontal scaling value; the vertical scaling */ 2129 /* value is determined the same way as */ 2130 /* @FT_SIZE_REQUEST_TYPE_REAL_DIM does. Finally, both scaling */ 2131 /* values are set to the smaller one. This type is useful if you */ 2132 /* want to specify the font size for, say, a window of a given */ 2133 /* dimension and 80x24 cells. */ 2134 /* */ 2135 /* FT_SIZE_REQUEST_TYPE_SCALES :: */ 2136 /* Specify the scaling values directly. */ 2137 /* */ 2138 /* <Note> */ 2139 /* The above descriptions only apply to scalable formats. For bitmap */ 2140 /* formats, the behaviour is up to the driver. */ 2141 /* */ 2142 /* See the note section of @FT_Size_Metrics if you wonder how size */ 2143 /* requesting relates to scaling values. */ 2144 /* */ 2145 typedef enum FT_Size_Request_Type_ 2146 { 2147 FT_SIZE_REQUEST_TYPE_NOMINAL, 2148 FT_SIZE_REQUEST_TYPE_REAL_DIM, 2149 FT_SIZE_REQUEST_TYPE_BBOX, 2150 FT_SIZE_REQUEST_TYPE_CELL, 2151 FT_SIZE_REQUEST_TYPE_SCALES, 2152 2153 FT_SIZE_REQUEST_TYPE_MAX 2154 2155 } FT_Size_Request_Type; 2156 2157 2158 /*************************************************************************/ 2159 /* */ 2160 /* <Struct> */ 2161 /* FT_Size_RequestRec */ 2162 /* */ 2163 /* <Description> */ 2164 /* A structure used to model a size request. */ 2165 /* */ 2166 /* <Fields> */ 2167 /* type :: See @FT_Size_Request_Type. */ 2168 /* */ 2169 /* width :: The desired width. */ 2170 /* */ 2171 /* height :: The desired height. */ 2172 /* */ 2173 /* horiResolution :: The horizontal resolution. If set to zero, */ 2174 /* `width' is treated as a 26.6 fractional pixel */ 2175 /* value. */ 2176 /* */ 2177 /* vertResolution :: The vertical resolution. If set to zero, */ 2178 /* `height' is treated as a 26.6 fractional pixel */ 2179 /* value. */ 2180 /* */ 2181 /* <Note> */ 2182 /* If `width' is zero, then the horizontal scaling value is set equal */ 2183 /* to the vertical scaling value, and vice versa. */ 2184 /* */ 2185 typedef struct FT_Size_RequestRec_ 2186 { 2187 FT_Size_Request_Type type; 2188 FT_Long width; 2189 FT_Long height; 2190 FT_UInt horiResolution; 2191 FT_UInt vertResolution; 2192 2193 } FT_Size_RequestRec; 2194 2195 2196 /*************************************************************************/ 2197 /* */ 2198 /* <Struct> */ 2199 /* FT_Size_Request */ 2200 /* */ 2201 /* <Description> */ 2202 /* A handle to a size request structure. */ 2203 /* */ 2204 typedef struct FT_Size_RequestRec_ *FT_Size_Request; 2205 2206 2207 /*************************************************************************/ 2208 /* */ 2209 /* <Function> */ 2210 /* FT_Request_Size */ 2211 /* */ 2212 /* <Description> */ 2213 /* Resize the scale of the active @FT_Size object in a face. */ 2214 /* */ 2215 /* <InOut> */ 2216 /* face :: A handle to a target face object. */ 2217 /* */ 2218 /* <Input> */ 2219 /* req :: A pointer to a @FT_Size_RequestRec. */ 2220 /* */ 2221 /* <Return> */ 2222 /* FreeType error code. 0~means success. */ 2223 /* */ 2224 /* <Note> */ 2225 /* Although drivers may select the bitmap strike matching the */ 2226 /* request, you should not rely on this if you intend to select a */ 2227 /* particular bitmap strike. Use @FT_Select_Size instead in that */ 2228 /* case. */ 2229 /* */ 2230 FT_EXPORT( FT_Error ) 2231 FT_Request_Size( FT_Face face, 2232 FT_Size_Request req ); 2233 2234 2235 /*************************************************************************/ 2236 /* */ 2237 /* <Function> */ 2238 /* FT_Set_Char_Size */ 2239 /* */ 2240 /* <Description> */ 2241 /* This function calls @FT_Request_Size to request the nominal size */ 2242 /* (in points). */ 2243 /* */ 2244 /* <InOut> */ 2245 /* face :: A handle to a target face object. */ 2246 /* */ 2247 /* <Input> */ 2248 /* char_width :: The nominal width, in 26.6 fractional points. */ 2249 /* */ 2250 /* char_height :: The nominal height, in 26.6 fractional points. */ 2251 /* */ 2252 /* horz_resolution :: The horizontal resolution in dpi. */ 2253 /* */ 2254 /* vert_resolution :: The vertical resolution in dpi. */ 2255 /* */ 2256 /* <Return> */ 2257 /* FreeType error code. 0~means success. */ 2258 /* */ 2259 /* <Note> */ 2260 /* If either the character width or height is zero, it is set equal */ 2261 /* to the other value. */ 2262 /* */ 2263 /* If either the horizontal or vertical resolution is zero, it is set */ 2264 /* equal to the other value. */ 2265 /* */ 2266 /* A character width or height smaller than 1pt is set to 1pt; if */ 2267 /* both resolution values are zero, they are set to 72dpi. */ 2268 /* */ 2269 /* Don't use this function if you are using the FreeType cache API. */ 2270 /* */ 2271 FT_EXPORT( FT_Error ) 2272 FT_Set_Char_Size( FT_Face face, 2273 FT_F26Dot6 char_width, 2274 FT_F26Dot6 char_height, 2275 FT_UInt horz_resolution, 2276 FT_UInt vert_resolution ); 2277 2278 2279 /*************************************************************************/ 2280 /* */ 2281 /* <Function> */ 2282 /* FT_Set_Pixel_Sizes */ 2283 /* */ 2284 /* <Description> */ 2285 /* This function calls @FT_Request_Size to request the nominal size */ 2286 /* (in pixels). */ 2287 /* */ 2288 /* <InOut> */ 2289 /* face :: A handle to the target face object. */ 2290 /* */ 2291 /* <Input> */ 2292 /* pixel_width :: The nominal width, in pixels. */ 2293 /* */ 2294 /* pixel_height :: The nominal height, in pixels. */ 2295 /* */ 2296 /* <Return> */ 2297 /* FreeType error code. 0~means success. */ 2298 /* */ 2299 FT_EXPORT( FT_Error ) 2300 FT_Set_Pixel_Sizes( FT_Face face, 2301 FT_UInt pixel_width, 2302 FT_UInt pixel_height ); 2303 2304 2305 /*************************************************************************/ 2306 /* */ 2307 /* <Function> */ 2308 /* FT_Load_Glyph */ 2309 /* */ 2310 /* <Description> */ 2311 /* A function used to load a single glyph into the glyph slot of a */ 2312 /* face object. */ 2313 /* */ 2314 /* <InOut> */ 2315 /* face :: A handle to the target face object where the glyph */ 2316 /* is loaded. */ 2317 /* */ 2318 /* <Input> */ 2319 /* glyph_index :: The index of the glyph in the font file. For */ 2320 /* CID-keyed fonts (either in PS or in CFF format) */ 2321 /* this argument specifies the CID value. */ 2322 /* */ 2323 /* load_flags :: A flag indicating what to load for this glyph. The */ 2324 /* @FT_LOAD_XXX constants can be used to control the */ 2325 /* glyph loading process (e.g., whether the outline */ 2326 /* should be scaled, whether to load bitmaps or not, */ 2327 /* whether to hint the outline, etc). */ 2328 /* */ 2329 /* <Return> */ 2330 /* FreeType error code. 0~means success. */ 2331 /* */ 2332 /* <Note> */ 2333 /* The loaded glyph may be transformed. See @FT_Set_Transform for */ 2334 /* the details. */ 2335 /* */ 2336 /* For subsetted CID-keyed fonts, `FT_Err_Invalid_Argument' is */ 2337 /* returned for invalid CID values (this is, for CID values which */ 2338 /* don't have a corresponding glyph in the font). See the discussion */ 2339 /* of the @FT_FACE_FLAG_CID_KEYED flag for more details. */ 2340 /* */ 2341 FT_EXPORT( FT_Error ) 2342 FT_Load_Glyph( FT_Face face, 2343 FT_UInt glyph_index, 2344 FT_Int32 load_flags ); 2345 2346 2347 /*************************************************************************/ 2348 /* */ 2349 /* <Function> */ 2350 /* FT_Load_Char */ 2351 /* */ 2352 /* <Description> */ 2353 /* A function used to load a single glyph into the glyph slot of a */ 2354 /* face object, according to its character code. */ 2355 /* */ 2356 /* <InOut> */ 2357 /* face :: A handle to a target face object where the glyph */ 2358 /* is loaded. */ 2359 /* */ 2360 /* <Input> */ 2361 /* char_code :: The glyph's character code, according to the */ 2362 /* current charmap used in the face. */ 2363 /* */ 2364 /* load_flags :: A flag indicating what to load for this glyph. The */ 2365 /* @FT_LOAD_XXX constants can be used to control the */ 2366 /* glyph loading process (e.g., whether the outline */ 2367 /* should be scaled, whether to load bitmaps or not, */ 2368 /* whether to hint the outline, etc). */ 2369 /* */ 2370 /* <Return> */ 2371 /* FreeType error code. 0~means success. */ 2372 /* */ 2373 /* <Note> */ 2374 /* This function simply calls @FT_Get_Char_Index and @FT_Load_Glyph. */ 2375 /* */ 2376 FT_EXPORT( FT_Error ) 2377 FT_Load_Char( FT_Face face, 2378 FT_ULong char_code, 2379 FT_Int32 load_flags ); 2380 2381 2382 /************************************************************************* 2383 * 2384 * @enum: 2385 * FT_LOAD_XXX 2386 * 2387 * @description: 2388 * A list of bit-field constants used with @FT_Load_Glyph to indicate 2389 * what kind of operations to perform during glyph loading. 2390 * 2391 * @values: 2392 * FT_LOAD_DEFAULT :: 2393 * Corresponding to~0, this value is used as the default glyph load 2394 * operation. In this case, the following happens: 2395 * 2396 * 1. FreeType looks for a bitmap for the glyph corresponding to the 2397 * face's current size. If one is found, the function returns. 2398 * The bitmap data can be accessed from the glyph slot (see note 2399 * below). 2400 * 2401 * 2. If no embedded bitmap is searched or found, FreeType looks for a 2402 * scalable outline. If one is found, it is loaded from the font 2403 * file, scaled to device pixels, then `hinted' to the pixel grid 2404 * in order to optimize it. The outline data can be accessed from 2405 * the glyph slot (see note below). 2406 * 2407 * Note that by default, the glyph loader doesn't render outlines into 2408 * bitmaps. The following flags are used to modify this default 2409 * behaviour to more specific and useful cases. 2410 * 2411 * FT_LOAD_NO_SCALE :: 2412 * Don't scale the outline glyph loaded, but keep it in font units. 2413 * 2414 * This flag implies @FT_LOAD_NO_HINTING and @FT_LOAD_NO_BITMAP, and 2415 * unsets @FT_LOAD_RENDER. 2416 * 2417 * FT_LOAD_NO_HINTING :: 2418 * Disable hinting. This generally generates `blurrier' bitmap glyph 2419 * when the glyph is rendered in any of the anti-aliased modes. See 2420 * also the note below. 2421 * 2422 * This flag is implied by @FT_LOAD_NO_SCALE. 2423 * 2424 * FT_LOAD_RENDER :: 2425 * Call @FT_Render_Glyph after the glyph is loaded. By default, the 2426 * glyph is rendered in @FT_RENDER_MODE_NORMAL mode. This can be 2427 * overridden by @FT_LOAD_TARGET_XXX or @FT_LOAD_MONOCHROME. 2428 * 2429 * This flag is unset by @FT_LOAD_NO_SCALE. 2430 * 2431 * FT_LOAD_NO_BITMAP :: 2432 * Ignore bitmap strikes when loading. Bitmap-only fonts ignore this 2433 * flag. 2434 * 2435 * @FT_LOAD_NO_SCALE always sets this flag. 2436 * 2437 * FT_LOAD_VERTICAL_LAYOUT :: 2438 * Load the glyph for vertical text layout. _Don't_ use it as it is 2439 * problematic currently. 2440 * 2441 * FT_LOAD_FORCE_AUTOHINT :: 2442 * Indicates that the auto-hinter is preferred over the font's native 2443 * hinter. See also the note below. 2444 * 2445 * FT_LOAD_CROP_BITMAP :: 2446 * Indicates that the font driver should crop the loaded bitmap glyph 2447 * (i.e., remove all space around its black bits). Not all drivers 2448 * implement this. 2449 * 2450 * FT_LOAD_PEDANTIC :: 2451 * Indicates that the font driver should perform pedantic verifications 2452 * during glyph loading. This is mostly used to detect broken glyphs 2453 * in fonts. By default, FreeType tries to handle broken fonts also. 2454 * 2455 * In particular, errors from the TrueType bytecode engine are not 2456 * passed to the application if this flag is not set; this might 2457 * result in partially hinted or distorted glyphs in case a glyph's 2458 * bytecode is buggy. 2459 * 2460 * FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH :: 2461 * Ignored. Deprecated. 2462 * 2463 * FT_LOAD_NO_RECURSE :: 2464 * This flag is only used internally. It merely indicates that the 2465 * font driver should not load composite glyphs recursively. Instead, 2466 * it should set the `num_subglyph' and `subglyphs' values of the 2467 * glyph slot accordingly, and set `glyph->format' to 2468 * @FT_GLYPH_FORMAT_COMPOSITE. 2469 * 2470 * The description of sub-glyphs is not available to client 2471 * applications for now. 2472 * 2473 * This flag implies @FT_LOAD_NO_SCALE and @FT_LOAD_IGNORE_TRANSFORM. 2474 * 2475 * FT_LOAD_IGNORE_TRANSFORM :: 2476 * Indicates that the transform matrix set by @FT_Set_Transform should 2477 * be ignored. 2478 * 2479 * FT_LOAD_MONOCHROME :: 2480 * This flag is used with @FT_LOAD_RENDER to indicate that you want to 2481 * render an outline glyph to a 1-bit monochrome bitmap glyph, with 2482 * 8~pixels packed into each byte of the bitmap data. 2483 * 2484 * Note that this has no effect on the hinting algorithm used. You 2485 * should rather use @FT_LOAD_TARGET_MONO so that the 2486 * monochrome-optimized hinting algorithm is used. 2487 * 2488 * FT_LOAD_LINEAR_DESIGN :: 2489 * Indicates that the `linearHoriAdvance' and `linearVertAdvance' 2490 * fields of @FT_GlyphSlotRec should be kept in font units. See 2491 * @FT_GlyphSlotRec for details. 2492 * 2493 * FT_LOAD_NO_AUTOHINT :: 2494 * Disable auto-hinter. See also the note below. 2495 * 2496 * @note: 2497 * By default, hinting is enabled and the font's native hinter (see 2498 * @FT_FACE_FLAG_HINTER) is preferred over the auto-hinter. You can 2499 * disable hinting by setting @FT_LOAD_NO_HINTING or change the 2500 * precedence by setting @FT_LOAD_FORCE_AUTOHINT. You can also set 2501 * @FT_LOAD_NO_AUTOHINT in case you don't want the auto-hinter to be 2502 * used at all. 2503 * 2504 * See the description of @FT_FACE_FLAG_TRICKY for a special exception 2505 * (affecting only a handful of Asian fonts). 2506 * 2507 * Besides deciding which hinter to use, you can also decide which 2508 * hinting algorithm to use. See @FT_LOAD_TARGET_XXX for details. 2509 * 2510 */ 2511#define FT_LOAD_DEFAULT 0x0 2512#define FT_LOAD_NO_SCALE ( 1L << 0 ) 2513#define FT_LOAD_NO_HINTING ( 1L << 1 ) 2514#define FT_LOAD_RENDER ( 1L << 2 ) 2515#define FT_LOAD_NO_BITMAP ( 1L << 3 ) 2516#define FT_LOAD_VERTICAL_LAYOUT ( 1L << 4 ) 2517#define FT_LOAD_FORCE_AUTOHINT ( 1L << 5 ) 2518#define FT_LOAD_CROP_BITMAP ( 1L << 6 ) 2519#define FT_LOAD_PEDANTIC ( 1L << 7 ) 2520#define FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ( 1L << 9 ) 2521#define FT_LOAD_NO_RECURSE ( 1L << 10 ) 2522#define FT_LOAD_IGNORE_TRANSFORM ( 1L << 11 ) 2523#define FT_LOAD_MONOCHROME ( 1L << 12 ) 2524#define FT_LOAD_LINEAR_DESIGN ( 1L << 13 ) 2525#define FT_LOAD_NO_AUTOHINT ( 1L << 15 ) 2526 2527 /* */ 2528 2529 /* used internally only by certain font drivers! */ 2530#define FT_LOAD_ADVANCE_ONLY ( 1L << 8 ) 2531#define FT_LOAD_SBITS_ONLY ( 1L << 14 ) 2532 2533 2534 /************************************************************************** 2535 * 2536 * @enum: 2537 * FT_LOAD_TARGET_XXX 2538 * 2539 * @description: 2540 * A list of values that are used to select a specific hinting algorithm 2541 * to use by the hinter. You should OR one of these values to your 2542 * `load_flags' when calling @FT_Load_Glyph. 2543 * 2544 * Note that font's native hinters may ignore the hinting algorithm you 2545 * have specified (e.g., the TrueType bytecode interpreter). You can set 2546 * @FT_LOAD_FORCE_AUTOHINT to ensure that the auto-hinter is used. 2547 * 2548 * Also note that @FT_LOAD_TARGET_LIGHT is an exception, in that it 2549 * always implies @FT_LOAD_FORCE_AUTOHINT. 2550 * 2551 * @values: 2552 * FT_LOAD_TARGET_NORMAL :: 2553 * This corresponds to the default hinting algorithm, optimized for 2554 * standard gray-level rendering. For monochrome output, use 2555 * @FT_LOAD_TARGET_MONO instead. 2556 * 2557 * FT_LOAD_TARGET_LIGHT :: 2558 * A lighter hinting algorithm for non-monochrome modes. Many 2559 * generated glyphs are more fuzzy but better resemble its original 2560 * shape. A bit like rendering on Mac OS~X. 2561 * 2562 * As a special exception, this target implies @FT_LOAD_FORCE_AUTOHINT. 2563 * 2564 * FT_LOAD_TARGET_MONO :: 2565 * Strong hinting algorithm that should only be used for monochrome 2566 * output. The result is probably unpleasant if the glyph is rendered 2567 * in non-monochrome modes. 2568 * 2569 * FT_LOAD_TARGET_LCD :: 2570 * A variant of @FT_LOAD_TARGET_NORMAL optimized for horizontally 2571 * decimated LCD displays. 2572 * 2573 * FT_LOAD_TARGET_LCD_V :: 2574 * A variant of @FT_LOAD_TARGET_NORMAL optimized for vertically 2575 * decimated LCD displays. 2576 * 2577 * @note: 2578 * You should use only _one_ of the FT_LOAD_TARGET_XXX values in your 2579 * `load_flags'. They can't be ORed. 2580 * 2581 * If @FT_LOAD_RENDER is also set, the glyph is rendered in the 2582 * corresponding mode (i.e., the mode which matches the used algorithm 2583 * best) unless @FT_LOAD_MONOCHROME is set. 2584 * 2585 * You can use a hinting algorithm that doesn't correspond to the same 2586 * rendering mode. As an example, it is possible to use the `light' 2587 * hinting algorithm and have the results rendered in horizontal LCD 2588 * pixel mode, with code like 2589 * 2590 * { 2591 * FT_Load_Glyph( face, glyph_index, 2592 * load_flags | FT_LOAD_TARGET_LIGHT ); 2593 * 2594 * FT_Render_Glyph( face->glyph, FT_RENDER_MODE_LCD ); 2595 * } 2596 * 2597 */ 2598#define FT_LOAD_TARGET_( x ) ( (FT_Int32)( (x) & 15 ) << 16 ) 2599 2600#define FT_LOAD_TARGET_NORMAL FT_LOAD_TARGET_( FT_RENDER_MODE_NORMAL ) 2601#define FT_LOAD_TARGET_LIGHT FT_LOAD_TARGET_( FT_RENDER_MODE_LIGHT ) 2602#define FT_LOAD_TARGET_MONO FT_LOAD_TARGET_( FT_RENDER_MODE_MONO ) 2603#define FT_LOAD_TARGET_LCD FT_LOAD_TARGET_( FT_RENDER_MODE_LCD ) 2604#define FT_LOAD_TARGET_LCD_V FT_LOAD_TARGET_( FT_RENDER_MODE_LCD_V ) 2605 2606 2607 /************************************************************************** 2608 * 2609 * @macro: 2610 * FT_LOAD_TARGET_MODE 2611 * 2612 * @description: 2613 * Return the @FT_Render_Mode corresponding to a given 2614 * @FT_LOAD_TARGET_XXX value. 2615 * 2616 */ 2617#define FT_LOAD_TARGET_MODE( x ) ( (FT_Render_Mode)( ( (x) >> 16 ) & 15 ) ) 2618 2619 2620 /*************************************************************************/ 2621 /* */ 2622 /* <Function> */ 2623 /* FT_Set_Transform */ 2624 /* */ 2625 /* <Description> */ 2626 /* A function used to set the transformation that is applied to glyph */ 2627 /* images when they are loaded into a glyph slot through */ 2628 /* @FT_Load_Glyph. */ 2629 /* */ 2630 /* <InOut> */ 2631 /* face :: A handle to the source face object. */ 2632 /* */ 2633 /* <Input> */ 2634 /* matrix :: A pointer to the transformation's 2x2 matrix. Use~0 for */ 2635 /* the identity matrix. */ 2636 /* delta :: A pointer to the translation vector. Use~0 for the null */ 2637 /* vector. */ 2638 /* */ 2639 /* <Note> */ 2640 /* The transformation is only applied to scalable image formats after */ 2641 /* the glyph has been loaded. It means that hinting is unaltered by */ 2642 /* the transformation and is performed on the character size given in */ 2643 /* the last call to @FT_Set_Char_Size or @FT_Set_Pixel_Sizes. */ 2644 /* */ 2645 /* Note that this also transforms the `face.glyph.advance' field, but */ 2646 /* *not* the values in `face.glyph.metrics'. */ 2647 /* */ 2648 FT_EXPORT( void ) 2649 FT_Set_Transform( FT_Face face, 2650 FT_Matrix* matrix, 2651 FT_Vector* delta ); 2652 2653 2654 /*************************************************************************/ 2655 /* */ 2656 /* <Enum> */ 2657 /* FT_Render_Mode */ 2658 /* */ 2659 /* <Description> */ 2660 /* An enumeration type that lists the render modes supported by */ 2661 /* FreeType~2. Each mode corresponds to a specific type of scanline */ 2662 /* conversion performed on the outline. */ 2663 /* */ 2664 /* For bitmap fonts and embedded bitmaps the `bitmap->pixel_mode' */ 2665 /* field in the @FT_GlyphSlotRec structure gives the format of the */ 2666 /* returned bitmap. */ 2667 /* */ 2668 /* All modes except @FT_RENDER_MODE_MONO use 256 levels of opacity. */ 2669 /* */ 2670 /* <Values> */ 2671 /* FT_RENDER_MODE_NORMAL :: */ 2672 /* This is the default render mode; it corresponds to 8-bit */ 2673 /* anti-aliased bitmaps. */ 2674 /* */ 2675 /* FT_RENDER_MODE_LIGHT :: */ 2676 /* This is equivalent to @FT_RENDER_MODE_NORMAL. It is only */ 2677 /* defined as a separate value because render modes are also used */ 2678 /* indirectly to define hinting algorithm selectors. See */ 2679 /* @FT_LOAD_TARGET_XXX for details. */ 2680 /* */ 2681 /* FT_RENDER_MODE_MONO :: */ 2682 /* This mode corresponds to 1-bit bitmaps (with 2~levels of */ 2683 /* opacity). */ 2684 /* */ 2685 /* FT_RENDER_MODE_LCD :: */ 2686 /* This mode corresponds to horizontal RGB and BGR sub-pixel */ 2687 /* displays like LCD screens. It produces 8-bit bitmaps that are */ 2688 /* 3~times the width of the original glyph outline in pixels, and */ 2689 /* which use the @FT_PIXEL_MODE_LCD mode. */ 2690 /* */ 2691 /* FT_RENDER_MODE_LCD_V :: */ 2692 /* This mode corresponds to vertical RGB and BGR sub-pixel displays */ 2693 /* (like PDA screens, rotated LCD displays, etc.). It produces */ 2694 /* 8-bit bitmaps that are 3~times the height of the original */ 2695 /* glyph outline in pixels and use the @FT_PIXEL_MODE_LCD_V mode. */ 2696 /* */ 2697 /* <Note> */ 2698 /* The LCD-optimized glyph bitmaps produced by FT_Render_Glyph can be */ 2699 /* filtered to reduce color-fringes by using @FT_Library_SetLcdFilter */ 2700 /* (not active in the default builds). It is up to the caller to */ 2701 /* either call @FT_Library_SetLcdFilter (if available) or do the */ 2702 /* filtering itself. */ 2703 /* */ 2704 /* The selected render mode only affects vector glyphs of a font. */ 2705 /* Embedded bitmaps often have a different pixel mode like */ 2706 /* @FT_PIXEL_MODE_MONO. You can use @FT_Bitmap_Convert to transform */ 2707 /* them into 8-bit pixmaps. */ 2708 /* */ 2709 typedef enum FT_Render_Mode_ 2710 { 2711 FT_RENDER_MODE_NORMAL = 0, 2712 FT_RENDER_MODE_LIGHT, 2713 FT_RENDER_MODE_MONO, 2714 FT_RENDER_MODE_LCD, 2715 FT_RENDER_MODE_LCD_V, 2716 2717 FT_RENDER_MODE_MAX 2718 2719 } FT_Render_Mode; 2720 2721 2722 /*************************************************************************/ 2723 /* */ 2724 /* <Enum> */ 2725 /* ft_render_mode_xxx */ 2726 /* */ 2727 /* <Description> */ 2728 /* These constants are deprecated. Use the corresponding */ 2729 /* @FT_Render_Mode values instead. */ 2730 /* */ 2731 /* <Values> */ 2732 /* ft_render_mode_normal :: see @FT_RENDER_MODE_NORMAL */ 2733 /* ft_render_mode_mono :: see @FT_RENDER_MODE_MONO */ 2734 /* */ 2735#define ft_render_mode_normal FT_RENDER_MODE_NORMAL 2736#define ft_render_mode_mono FT_RENDER_MODE_MONO 2737 2738 2739 /*************************************************************************/ 2740 /* */ 2741 /* <Function> */ 2742 /* FT_Render_Glyph */ 2743 /* */ 2744 /* <Description> */ 2745 /* Convert a given glyph image to a bitmap. It does so by inspecting */ 2746 /* the glyph image format, finding the relevant renderer, and */ 2747 /* invoking it. */ 2748 /* */ 2749 /* <InOut> */ 2750 /* slot :: A handle to the glyph slot containing the image to */ 2751 /* convert. */ 2752 /* */ 2753 /* <Input> */ 2754 /* render_mode :: This is the render mode used to render the glyph */ 2755 /* image into a bitmap. See @FT_Render_Mode for a */ 2756 /* list of possible values. */ 2757 /* */ 2758 /* <Return> */ 2759 /* FreeType error code. 0~means success. */ 2760 /* */ 2761 FT_EXPORT( FT_Error ) 2762 FT_Render_Glyph( FT_GlyphSlot slot, 2763 FT_Render_Mode render_mode ); 2764 2765 2766 /*************************************************************************/ 2767 /* */ 2768 /* <Enum> */ 2769 /* FT_Kerning_Mode */ 2770 /* */ 2771 /* <Description> */ 2772 /* An enumeration used to specify which kerning values to return in */ 2773 /* @FT_Get_Kerning. */ 2774 /* */ 2775 /* <Values> */ 2776 /* FT_KERNING_DEFAULT :: Return scaled and grid-fitted kerning */ 2777 /* distances (value is~0). */ 2778 /* */ 2779 /* FT_KERNING_UNFITTED :: Return scaled but un-grid-fitted kerning */ 2780 /* distances. */ 2781 /* */ 2782 /* FT_KERNING_UNSCALED :: Return the kerning vector in original font */ 2783 /* units. */ 2784 /* */ 2785 typedef enum FT_Kerning_Mode_ 2786 { 2787 FT_KERNING_DEFAULT = 0, 2788 FT_KERNING_UNFITTED, 2789 FT_KERNING_UNSCALED 2790 2791 } FT_Kerning_Mode; 2792 2793 2794 /*************************************************************************/ 2795 /* */ 2796 /* <Const> */ 2797 /* ft_kerning_default */ 2798 /* */ 2799 /* <Description> */ 2800 /* This constant is deprecated. Please use @FT_KERNING_DEFAULT */ 2801 /* instead. */ 2802 /* */ 2803#define ft_kerning_default FT_KERNING_DEFAULT 2804 2805 2806 /*************************************************************************/ 2807 /* */ 2808 /* <Const> */ 2809 /* ft_kerning_unfitted */ 2810 /* */ 2811 /* <Description> */ 2812 /* This constant is deprecated. Please use @FT_KERNING_UNFITTED */ 2813 /* instead. */ 2814 /* */ 2815#define ft_kerning_unfitted FT_KERNING_UNFITTED 2816 2817 2818 /*************************************************************************/ 2819 /* */ 2820 /* <Const> */ 2821 /* ft_kerning_unscaled */ 2822 /* */ 2823 /* <Description> */ 2824 /* This constant is deprecated. Please use @FT_KERNING_UNSCALED */ 2825 /* instead. */ 2826 /* */ 2827#define ft_kerning_unscaled FT_KERNING_UNSCALED 2828 2829 2830 /*************************************************************************/ 2831 /* */ 2832 /* <Function> */ 2833 /* FT_Get_Kerning */ 2834 /* */ 2835 /* <Description> */ 2836 /* Return the kerning vector between two glyphs of a same face. */ 2837 /* */ 2838 /* <Input> */ 2839 /* face :: A handle to a source face object. */ 2840 /* */ 2841 /* left_glyph :: The index of the left glyph in the kern pair. */ 2842 /* */ 2843 /* right_glyph :: The index of the right glyph in the kern pair. */ 2844 /* */ 2845 /* kern_mode :: See @FT_Kerning_Mode for more information. */ 2846 /* Determines the scale and dimension of the returned */ 2847 /* kerning vector. */ 2848 /* */ 2849 /* <Output> */ 2850 /* akerning :: The kerning vector. This is either in font units */ 2851 /* or in pixels (26.6 format) for scalable formats, */ 2852 /* and in pixels for fixed-sizes formats. */ 2853 /* */ 2854 /* <Return> */ 2855 /* FreeType error code. 0~means success. */ 2856 /* */ 2857 /* <Note> */ 2858 /* Only horizontal layouts (left-to-right & right-to-left) are */ 2859 /* supported by this method. Other layouts, or more sophisticated */ 2860 /* kernings, are out of the scope of this API function -- they can be */ 2861 /* implemented through format-specific interfaces. */ 2862 /* */ 2863 FT_EXPORT( FT_Error ) 2864 FT_Get_Kerning( FT_Face face, 2865 FT_UInt left_glyph, 2866 FT_UInt right_glyph, 2867 FT_UInt kern_mode, 2868 FT_Vector *akerning ); 2869 2870 2871 /*************************************************************************/ 2872 /* */ 2873 /* <Function> */ 2874 /* FT_Get_Track_Kerning */ 2875 /* */ 2876 /* <Description> */ 2877 /* Return the track kerning for a given face object at a given size. */ 2878 /* */ 2879 /* <Input> */ 2880 /* face :: A handle to a source face object. */ 2881 /* */ 2882 /* point_size :: The point size in 16.16 fractional points. */ 2883 /* */ 2884 /* degree :: The degree of tightness. Increasingly negative */ 2885 /* values represent tighter track kerning, while */ 2886 /* increasingly positive values represent looser track */ 2887 /* kerning. Value zero means no track kerning. */ 2888 /* */ 2889 /* <Output> */ 2890 /* akerning :: The kerning in 16.16 fractional points, to be */ 2891 /* uniformly applied between all glyphs. */ 2892 /* */ 2893 /* <Return> */ 2894 /* FreeType error code. 0~means success. */ 2895 /* */ 2896 /* <Note> */ 2897 /* Currently, only the Type~1 font driver supports track kerning, */ 2898 /* using data from AFM files (if attached with @FT_Attach_File or */ 2899 /* @FT_Attach_Stream). */ 2900 /* */ 2901 /* Only very few AFM files come with track kerning data; please refer */ 2902 /* to the Adobe's AFM specification for more details. */ 2903 /* */ 2904 FT_EXPORT( FT_Error ) 2905 FT_Get_Track_Kerning( FT_Face face, 2906 FT_Fixed point_size, 2907 FT_Int degree, 2908 FT_Fixed* akerning ); 2909 2910 2911 /*************************************************************************/ 2912 /* */ 2913 /* <Function> */ 2914 /* FT_Get_Glyph_Name */ 2915 /* */ 2916 /* <Description> */ 2917 /* Retrieve the ASCII name of a given glyph in a face. This only */ 2918 /* works for those faces where @FT_HAS_GLYPH_NAMES(face) returns~1. */ 2919 /* */ 2920 /* <Input> */ 2921 /* face :: A handle to a source face object. */ 2922 /* */ 2923 /* glyph_index :: The glyph index. */ 2924 /* */ 2925 /* buffer_max :: The maximal number of bytes available in the */ 2926 /* buffer. */ 2927 /* */ 2928 /* <Output> */ 2929 /* buffer :: A pointer to a target buffer where the name is */ 2930 /* copied to. */ 2931 /* */ 2932 /* <Return> */ 2933 /* FreeType error code. 0~means success. */ 2934 /* */ 2935 /* <Note> */ 2936 /* An error is returned if the face doesn't provide glyph names or if */ 2937 /* the glyph index is invalid. In all cases of failure, the first */ 2938 /* byte of `buffer' is set to~0 to indicate an empty name. */ 2939 /* */ 2940 /* The glyph name is truncated to fit within the buffer if it is too */ 2941 /* long. The returned string is always zero-terminated. */ 2942 /* */ 2943 /* Be aware that FreeType reorders glyph indices internally so that */ 2944 /* glyph index~0 always corresponds to the `missing glyph' (called */ 2945 /* `.notdef'). */ 2946 /* */ 2947 /* This function is not compiled within the library if the config */ 2948 /* macro `FT_CONFIG_OPTION_NO_GLYPH_NAMES' is defined in */ 2949 /* `include/freetype/config/ftoptions.h'. */ 2950 /* */ 2951 FT_EXPORT( FT_Error ) 2952 FT_Get_Glyph_Name( FT_Face face, 2953 FT_UInt glyph_index, 2954 FT_Pointer buffer, 2955 FT_UInt buffer_max ); 2956 2957 2958 /*************************************************************************/ 2959 /* */ 2960 /* <Function> */ 2961 /* FT_Get_Postscript_Name */ 2962 /* */ 2963 /* <Description> */ 2964 /* Retrieve the ASCII PostScript name of a given face, if available. */ 2965 /* This only works with PostScript and TrueType fonts. */ 2966 /* */ 2967 /* <Input> */ 2968 /* face :: A handle to the source face object. */ 2969 /* */ 2970 /* <Return> */ 2971 /* A pointer to the face's PostScript name. NULL if unavailable. */ 2972 /* */ 2973 /* <Note> */ 2974 /* The returned pointer is owned by the face and is destroyed with */ 2975 /* it. */ 2976 /* */ 2977 FT_EXPORT( const char* ) 2978 FT_Get_Postscript_Name( FT_Face face ); 2979 2980 2981 /*************************************************************************/ 2982 /* */ 2983 /* <Function> */ 2984 /* FT_Select_Charmap */ 2985 /* */ 2986 /* <Description> */ 2987 /* Select a given charmap by its encoding tag (as listed in */ 2988 /* `freetype.h'). */ 2989 /* */ 2990 /* <InOut> */ 2991 /* face :: A handle to the source face object. */ 2992 /* */ 2993 /* <Input> */ 2994 /* encoding :: A handle to the selected encoding. */ 2995 /* */ 2996 /* <Return> */ 2997 /* FreeType error code. 0~means success. */ 2998 /* */ 2999 /* <Note> */ 3000 /* This function returns an error if no charmap in the face */ 3001 /* corresponds to the encoding queried here. */ 3002 /* */ 3003 /* Because many fonts contain more than a single cmap for Unicode */ 3004 /* encoding, this function has some special code to select the one */ 3005 /* which covers Unicode best (`best' in the sense that a UCS-4 cmap */ 3006 /* is preferred to a UCS-2 cmap). It is thus preferable to */ 3007 /* @FT_Set_Charmap in this case. */ 3008 /* */ 3009 FT_EXPORT( FT_Error ) 3010 FT_Select_Charmap( FT_Face face, 3011 FT_Encoding encoding ); 3012 3013 3014 /*************************************************************************/ 3015 /* */ 3016 /* <Function> */ 3017 /* FT_Set_Charmap */ 3018 /* */ 3019 /* <Description> */ 3020 /* Select a given charmap for character code to glyph index mapping. */ 3021 /* */ 3022 /* <InOut> */ 3023 /* face :: A handle to the source face object. */ 3024 /* */ 3025 /* <Input> */ 3026 /* charmap :: A handle to the selected charmap. */ 3027 /* */ 3028 /* <Return> */ 3029 /* FreeType error code. 0~means success. */ 3030 /* */ 3031 /* <Note> */ 3032 /* This function returns an error if the charmap is not part of */ 3033 /* the face (i.e., if it is not listed in the `face->charmaps' */ 3034 /* table). */ 3035 /* */ 3036 /* It also fails if a type~14 charmap is selected. */ 3037 /* */ 3038 FT_EXPORT( FT_Error ) 3039 FT_Set_Charmap( FT_Face face, 3040 FT_CharMap charmap ); 3041 3042 3043 /************************************************************************* 3044 * 3045 * @function: 3046 * FT_Get_Charmap_Index 3047 * 3048 * @description: 3049 * Retrieve index of a given charmap. 3050 * 3051 * @input: 3052 * charmap :: 3053 * A handle to a charmap. 3054 * 3055 * @return: 3056 * The index into the array of character maps within the face to which 3057 * `charmap' belongs. If an error occurs, -1 is returned. 3058 * 3059 */ 3060 FT_EXPORT( FT_Int ) 3061 FT_Get_Charmap_Index( FT_CharMap charmap ); 3062 3063 3064 /*************************************************************************/ 3065 /* */ 3066 /* <Function> */ 3067 /* FT_Get_Char_Index */ 3068 /* */ 3069 /* <Description> */ 3070 /* Return the glyph index of a given character code. This function */ 3071 /* uses a charmap object to do the mapping. */ 3072 /* */ 3073 /* <Input> */ 3074 /* face :: A handle to the source face object. */ 3075 /* */ 3076 /* charcode :: The character code. */ 3077 /* */ 3078 /* <Return> */ 3079 /* The glyph index. 0~means `undefined character code'. */ 3080 /* */ 3081 /* <Note> */ 3082 /* If you use FreeType to manipulate the contents of font files */ 3083 /* directly, be aware that the glyph index returned by this function */ 3084 /* doesn't always correspond to the internal indices used within */ 3085 /* the file. This is done to ensure that value~0 always corresponds */ 3086 /* to the `missing glyph'. */ 3087 /* */ 3088 FT_EXPORT( FT_UInt ) 3089 FT_Get_Char_Index( FT_Face face, 3090 FT_ULong charcode ); 3091 3092 3093 /*************************************************************************/ 3094 /* */ 3095 /* <Function> */ 3096 /* FT_Get_First_Char */ 3097 /* */ 3098 /* <Description> */ 3099 /* This function is used to return the first character code in the */ 3100 /* current charmap of a given face. It also returns the */ 3101 /* corresponding glyph index. */ 3102 /* */ 3103 /* <Input> */ 3104 /* face :: A handle to the source face object. */ 3105 /* */ 3106 /* <Output> */ 3107 /* agindex :: Glyph index of first character code. 0~if charmap is */ 3108 /* empty. */ 3109 /* */ 3110 /* <Return> */ 3111 /* The charmap's first character code. */ 3112 /* */ 3113 /* <Note> */ 3114 /* You should use this function with @FT_Get_Next_Char to be able to */ 3115 /* parse all character codes available in a given charmap. The code */ 3116 /* should look like this: */ 3117 /* */ 3118 /* { */ 3119 /* FT_ULong charcode; */ 3120 /* FT_UInt gindex; */ 3121 /* */ 3122 /* */ 3123 /* charcode = FT_Get_First_Char( face, &gindex ); */ 3124 /* while ( gindex != 0 ) */ 3125 /* { */ 3126 /* ... do something with (charcode,gindex) pair ... */ 3127 /* */ 3128 /* charcode = FT_Get_Next_Char( face, charcode, &gindex ); */ 3129 /* } */ 3130 /* } */ 3131 /* */ 3132 /* Note that `*agindex' is set to~0 if the charmap is empty. The */ 3133 /* result itself can be~0 in two cases: if the charmap is empty or */ 3134 /* if the value~0 is the first valid character code. */ 3135 /* */ 3136 FT_EXPORT( FT_ULong ) 3137 FT_Get_First_Char( FT_Face face, 3138 FT_UInt *agindex ); 3139 3140 3141 /*************************************************************************/ 3142 /* */ 3143 /* <Function> */ 3144 /* FT_Get_Next_Char */ 3145 /* */ 3146 /* <Description> */ 3147 /* This function is used to return the next character code in the */ 3148 /* current charmap of a given face following the value `char_code', */ 3149 /* as well as the corresponding glyph index. */ 3150 /* */ 3151 /* <Input> */ 3152 /* face :: A handle to the source face object. */ 3153 /* char_code :: The starting character code. */ 3154 /* */ 3155 /* <Output> */ 3156 /* agindex :: Glyph index of next character code. 0~if charmap */ 3157 /* is empty. */ 3158 /* */ 3159 /* <Return> */ 3160 /* The charmap's next character code. */ 3161 /* */ 3162 /* <Note> */ 3163 /* You should use this function with @FT_Get_First_Char to walk */ 3164 /* over all character codes available in a given charmap. See the */ 3165 /* note for this function for a simple code example. */ 3166 /* */ 3167 /* Note that `*agindex' is set to~0 when there are no more codes in */ 3168 /* the charmap. */ 3169 /* */ 3170 FT_EXPORT( FT_ULong ) 3171 FT_Get_Next_Char( FT_Face face, 3172 FT_ULong char_code, 3173 FT_UInt *agindex ); 3174 3175 3176 /*************************************************************************/ 3177 /* */ 3178 /* <Function> */ 3179 /* FT_Get_Name_Index */ 3180 /* */ 3181 /* <Description> */ 3182 /* Return the glyph index of a given glyph name. This function uses */ 3183 /* driver specific objects to do the translation. */ 3184 /* */ 3185 /* <Input> */ 3186 /* face :: A handle to the source face object. */ 3187 /* */ 3188 /* glyph_name :: The glyph name. */ 3189 /* */ 3190 /* <Return> */ 3191 /* The glyph index. 0~means `undefined character code'. */ 3192 /* */ 3193 FT_EXPORT( FT_UInt ) 3194 FT_Get_Name_Index( FT_Face face, 3195 FT_String* glyph_name ); 3196 3197 3198 /************************************************************************* 3199 * 3200 * @macro: 3201 * FT_SUBGLYPH_FLAG_XXX 3202 * 3203 * @description: 3204 * A list of constants used to describe subglyphs. Please refer to the 3205 * TrueType specification for the meaning of the various flags. 3206 * 3207 * @values: 3208 * FT_SUBGLYPH_FLAG_ARGS_ARE_WORDS :: 3209 * FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES :: 3210 * FT_SUBGLYPH_FLAG_ROUND_XY_TO_GRID :: 3211 * FT_SUBGLYPH_FLAG_SCALE :: 3212 * FT_SUBGLYPH_FLAG_XY_SCALE :: 3213 * FT_SUBGLYPH_FLAG_2X2 :: 3214 * FT_SUBGLYPH_FLAG_USE_MY_METRICS :: 3215 * 3216 */ 3217#define FT_SUBGLYPH_FLAG_ARGS_ARE_WORDS 1 3218#define FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES 2 3219#define FT_SUBGLYPH_FLAG_ROUND_XY_TO_GRID 4 3220#define FT_SUBGLYPH_FLAG_SCALE 8 3221#define FT_SUBGLYPH_FLAG_XY_SCALE 0x40 3222#define FT_SUBGLYPH_FLAG_2X2 0x80 3223#define FT_SUBGLYPH_FLAG_USE_MY_METRICS 0x200 3224 3225 3226 /************************************************************************* 3227 * 3228 * @func: 3229 * FT_Get_SubGlyph_Info 3230 * 3231 * @description: 3232 * Retrieve a description of a given subglyph. Only use it if 3233 * `glyph->format' is @FT_GLYPH_FORMAT_COMPOSITE; an error is 3234 * returned otherwise. 3235 * 3236 * @input: 3237 * glyph :: 3238 * The source glyph slot. 3239 * 3240 * sub_index :: 3241 * The index of the subglyph. Must be less than 3242 * `glyph->num_subglyphs'. 3243 * 3244 * @output: 3245 * p_index :: 3246 * The glyph index of the subglyph. 3247 * 3248 * p_flags :: 3249 * The subglyph flags, see @FT_SUBGLYPH_FLAG_XXX. 3250 * 3251 * p_arg1 :: 3252 * The subglyph's first argument (if any). 3253 * 3254 * p_arg2 :: 3255 * The subglyph's second argument (if any). 3256 * 3257 * p_transform :: 3258 * The subglyph transformation (if any). 3259 * 3260 * @return: 3261 * FreeType error code. 0~means success. 3262 * 3263 * @note: 3264 * The values of `*p_arg1', `*p_arg2', and `*p_transform' must be 3265 * interpreted depending on the flags returned in `*p_flags'. See the 3266 * TrueType specification for details. 3267 * 3268 */ 3269 FT_EXPORT( FT_Error ) 3270 FT_Get_SubGlyph_Info( FT_GlyphSlot glyph, 3271 FT_UInt sub_index, 3272 FT_Int *p_index, 3273 FT_UInt *p_flags, 3274 FT_Int *p_arg1, 3275 FT_Int *p_arg2, 3276 FT_Matrix *p_transform ); 3277 3278 3279 /*************************************************************************/ 3280 /* */ 3281 /* <Enum> */ 3282 /* FT_FSTYPE_XXX */ 3283 /* */ 3284 /* <Description> */ 3285 /* A list of bit flags used in the `fsType' field of the OS/2 table */ 3286 /* in a TrueType or OpenType font and the `FSType' entry in a */ 3287 /* PostScript font. These bit flags are returned by */ 3288 /* @FT_Get_FSType_Flags; they inform client applications of embedding */ 3289 /* and subsetting restrictions associated with a font. */ 3290 /* */ 3291 /* See http://www.adobe.com/devnet/acrobat/pdfs/FontPolicies.pdf for */ 3292 /* more details. */ 3293 /* */ 3294 /* <Values> */ 3295 /* FT_FSTYPE_INSTALLABLE_EMBEDDING :: */ 3296 /* Fonts with no fsType bit set may be embedded and permanently */ 3297 /* installed on the remote system by an application. */ 3298 /* */ 3299 /* FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING :: */ 3300 /* Fonts that have only this bit set must not be modified, embedded */ 3301 /* or exchanged in any manner without first obtaining permission of */ 3302 /* the font software copyright owner. */ 3303 /* */ 3304 /* FT_FSTYPE_PREVIEW_AND_PRINT_EMBEDDING :: */ 3305 /* If this bit is set, the font may be embedded and temporarily */ 3306 /* loaded on the remote system. Documents containing Preview & */ 3307 /* Print fonts must be opened `read-only'; no edits can be applied */ 3308 /* to the document. */ 3309 /* */ 3310 /* FT_FSTYPE_EDITABLE_EMBEDDING :: */ 3311 /* If this bit is set, the font may be embedded but must only be */ 3312 /* installed temporarily on other systems. In contrast to Preview */ 3313 /* & Print fonts, documents containing editable fonts may be opened */ 3314 /* for reading, editing is permitted, and changes may be saved. */ 3315 /* */ 3316 /* FT_FSTYPE_NO_SUBSETTING :: */ 3317 /* If this bit is set, the font may not be subsetted prior to */ 3318 /* embedding. */ 3319 /* */ 3320 /* FT_FSTYPE_BITMAP_EMBEDDING_ONLY :: */ 3321 /* If this bit is set, only bitmaps contained in the font may be */ 3322 /* embedded; no outline data may be embedded. If there are no */ 3323 /* bitmaps available in the font, then the font is unembeddable. */ 3324 /* */ 3325 /* <Note> */ 3326 /* While the fsType flags can indicate that a font may be embedded, a */ 3327 /* license with the font vendor may be separately required to use the */ 3328 /* font in this way. */ 3329 /* */ 3330#define FT_FSTYPE_INSTALLABLE_EMBEDDING 0x0000 3331#define FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING 0x0002 3332#define FT_FSTYPE_PREVIEW_AND_PRINT_EMBEDDING 0x0004 3333#define FT_FSTYPE_EDITABLE_EMBEDDING 0x0008 3334#define FT_FSTYPE_NO_SUBSETTING 0x0100 3335#define FT_FSTYPE_BITMAP_EMBEDDING_ONLY 0x0200 3336 3337 3338 /*************************************************************************/ 3339 /* */ 3340 /* <Function> */ 3341 /* FT_Get_FSType_Flags */ 3342 /* */ 3343 /* <Description> */ 3344 /* Return the fsType flags for a font. */ 3345 /* */ 3346 /* <Input> */ 3347 /* face :: A handle to the source face object. */ 3348 /* */ 3349 /* <Return> */ 3350 /* The fsType flags, @FT_FSTYPE_XXX. */ 3351 /* */ 3352 /* <Note> */ 3353 /* Use this function rather than directly reading the `fs_type' field */ 3354 /* in the @PS_FontInfoRec structure which is only guaranteed to */ 3355 /* return the correct results for Type~1 fonts. */ 3356 /* */ 3357 /* <Since> */ 3358 /* 2.3.8 */ 3359 /* */ 3360 FT_EXPORT( FT_UShort ) 3361 FT_Get_FSType_Flags( FT_Face face ); 3362 3363 3364 /*************************************************************************/ 3365 /* */ 3366 /* <Section> */ 3367 /* glyph_variants */ 3368 /* */ 3369 /* <Title> */ 3370 /* Glyph Variants */ 3371 /* */ 3372 /* <Abstract> */ 3373 /* The FreeType~2 interface to Unicode Ideographic Variation */ 3374 /* Sequences (IVS), using the SFNT cmap format~14. */ 3375 /* */ 3376 /* <Description> */ 3377 /* Many CJK characters have variant forms. They are a sort of grey */ 3378 /* area somewhere between being totally irrelevant and semantically */ 3379 /* distinct; for this reason, the Unicode consortium decided to */ 3380 /* introduce Ideographic Variation Sequences (IVS), consisting of a */ 3381 /* Unicode base character and one of 240 variant selectors */ 3382 /* (U+E0100-U+E01EF), instead of further extending the already huge */ 3383 /* code range for CJK characters. */ 3384 /* */ 3385 /* An IVS is registered and unique; for further details please refer */ 3386 /* to Unicode Technical Report #37, the Ideographic Variation */ 3387 /* Database. To date (October 2007), the character with the most */ 3388 /* variants is U+908A, having 8~such IVS. */ 3389 /* */ 3390 /* Adobe and MS decided to support IVS with a new cmap subtable */ 3391 /* (format~14). It is an odd subtable because it is not a mapping of */ 3392 /* input code points to glyphs, but contains lists of all variants */ 3393 /* supported by the font. */ 3394 /* */ 3395 /* A variant may be either `default' or `non-default'. A default */ 3396 /* variant is the one you will get for that code point if you look it */ 3397 /* up in the standard Unicode cmap. A non-default variant is a */ 3398 /* different glyph. */ 3399 /* */ 3400 /*************************************************************************/ 3401 3402 3403 /*************************************************************************/ 3404 /* */ 3405 /* <Function> */ 3406 /* FT_Face_GetCharVariantIndex */ 3407 /* */ 3408 /* <Description> */ 3409 /* Return the glyph index of a given character code as modified by */ 3410 /* the variation selector. */ 3411 /* */ 3412 /* <Input> */ 3413 /* face :: */ 3414 /* A handle to the source face object. */ 3415 /* */ 3416 /* charcode :: */ 3417 /* The character code point in Unicode. */ 3418 /* */ 3419 /* variantSelector :: */ 3420 /* The Unicode code point of the variation selector. */ 3421 /* */ 3422 /* <Return> */ 3423 /* The glyph index. 0~means either `undefined character code', or */ 3424 /* `undefined selector code', or `no variation selector cmap */ 3425 /* subtable', or `current CharMap is not Unicode'. */ 3426 /* */ 3427 /* <Note> */ 3428 /* If you use FreeType to manipulate the contents of font files */ 3429 /* directly, be aware that the glyph index returned by this function */ 3430 /* doesn't always correspond to the internal indices used within */ 3431 /* the file. This is done to ensure that value~0 always corresponds */ 3432 /* to the `missing glyph'. */ 3433 /* */ 3434 /* This function is only meaningful if */ 3435 /* a) the font has a variation selector cmap sub table, */ 3436 /* and */ 3437 /* b) the current charmap has a Unicode encoding. */ 3438 /* */ 3439 /* <Since> */ 3440 /* 2.3.6 */ 3441 /* */ 3442 FT_EXPORT( FT_UInt ) 3443 FT_Face_GetCharVariantIndex( FT_Face face, 3444 FT_ULong charcode, 3445 FT_ULong variantSelector ); 3446 3447 3448 /*************************************************************************/ 3449 /* */ 3450 /* <Function> */ 3451 /* FT_Face_GetCharVariantIsDefault */ 3452 /* */ 3453 /* <Description> */ 3454 /* Check whether this variant of this Unicode character is the one to */ 3455 /* be found in the `cmap'. */ 3456 /* */ 3457 /* <Input> */ 3458 /* face :: */ 3459 /* A handle to the source face object. */ 3460 /* */ 3461 /* charcode :: */ 3462 /* The character codepoint in Unicode. */ 3463 /* */ 3464 /* variantSelector :: */ 3465 /* The Unicode codepoint of the variation selector. */ 3466 /* */ 3467 /* <Return> */ 3468 /* 1~if found in the standard (Unicode) cmap, 0~if found in the */ 3469 /* variation selector cmap, or -1 if it is not a variant. */ 3470 /* */ 3471 /* <Note> */ 3472 /* This function is only meaningful if the font has a variation */ 3473 /* selector cmap subtable. */ 3474 /* */ 3475 /* <Since> */ 3476 /* 2.3.6 */ 3477 /* */ 3478 FT_EXPORT( FT_Int ) 3479 FT_Face_GetCharVariantIsDefault( FT_Face face, 3480 FT_ULong charcode, 3481 FT_ULong variantSelector ); 3482 3483 3484 /*************************************************************************/ 3485 /* */ 3486 /* <Function> */ 3487 /* FT_Face_GetVariantSelectors */ 3488 /* */ 3489 /* <Description> */ 3490 /* Return a zero-terminated list of Unicode variant selectors found */ 3491 /* in the font. */ 3492 /* */ 3493 /* <Input> */ 3494 /* face :: */ 3495 /* A handle to the source face object. */ 3496 /* */ 3497 /* <Return> */ 3498 /* A pointer to an array of selector code points, or NULL if there is */ 3499 /* no valid variant selector cmap subtable. */ 3500 /* */ 3501 /* <Note> */ 3502 /* The last item in the array is~0; the array is owned by the */ 3503 /* @FT_Face object but can be overwritten or released on the next */ 3504 /* call to a FreeType function. */ 3505 /* */ 3506 /* <Since> */ 3507 /* 2.3.6 */ 3508 /* */ 3509 FT_EXPORT( FT_UInt32* ) 3510 FT_Face_GetVariantSelectors( FT_Face face ); 3511 3512 3513 /*************************************************************************/ 3514 /* */ 3515 /* <Function> */ 3516 /* FT_Face_GetVariantsOfChar */ 3517 /* */ 3518 /* <Description> */ 3519 /* Return a zero-terminated list of Unicode variant selectors found */ 3520 /* for the specified character code. */ 3521 /* */ 3522 /* <Input> */ 3523 /* face :: */ 3524 /* A handle to the source face object. */ 3525 /* */ 3526 /* charcode :: */ 3527 /* The character codepoint in Unicode. */ 3528 /* */ 3529 /* <Return> */ 3530 /* A pointer to an array of variant selector code points which are */ 3531 /* active for the given character, or NULL if the corresponding list */ 3532 /* is empty. */ 3533 /* */ 3534 /* <Note> */ 3535 /* The last item in the array is~0; the array is owned by the */ 3536 /* @FT_Face object but can be overwritten or released on the next */ 3537 /* call to a FreeType function. */ 3538 /* */ 3539 /* <Since> */ 3540 /* 2.3.6 */ 3541 /* */ 3542 FT_EXPORT( FT_UInt32* ) 3543 FT_Face_GetVariantsOfChar( FT_Face face, 3544 FT_ULong charcode ); 3545 3546 3547 /*************************************************************************/ 3548 /* */ 3549 /* <Function> */ 3550 /* FT_Face_GetCharsOfVariant */ 3551 /* */ 3552 /* <Description> */ 3553 /* Return a zero-terminated list of Unicode character codes found for */ 3554 /* the specified variant selector. */ 3555 /* */ 3556 /* <Input> */ 3557 /* face :: */ 3558 /* A handle to the source face object. */ 3559 /* */ 3560 /* variantSelector :: */ 3561 /* The variant selector code point in Unicode. */ 3562 /* */ 3563 /* <Return> */ 3564 /* A list of all the code points which are specified by this selector */ 3565 /* (both default and non-default codes are returned) or NULL if there */ 3566 /* is no valid cmap or the variant selector is invalid. */ 3567 /* */ 3568 /* <Note> */ 3569 /* The last item in the array is~0; the array is owned by the */ 3570 /* @FT_Face object but can be overwritten or released on the next */ 3571 /* call to a FreeType function. */ 3572 /* */ 3573 /* <Since> */ 3574 /* 2.3.6 */ 3575 /* */ 3576 FT_EXPORT( FT_UInt32* ) 3577 FT_Face_GetCharsOfVariant( FT_Face face, 3578 FT_ULong variantSelector ); 3579 3580 3581 /*************************************************************************/ 3582 /* */ 3583 /* <Section> */ 3584 /* computations */ 3585 /* */ 3586 /* <Title> */ 3587 /* Computations */ 3588 /* */ 3589 /* <Abstract> */ 3590 /* Crunching fixed numbers and vectors. */ 3591 /* */ 3592 /* <Description> */ 3593 /* This section contains various functions used to perform */ 3594 /* computations on 16.16 fixed-float numbers or 2d vectors. */ 3595 /* */ 3596 /* <Order> */ 3597 /* FT_MulDiv */ 3598 /* FT_MulFix */ 3599 /* FT_DivFix */ 3600 /* FT_RoundFix */ 3601 /* FT_CeilFix */ 3602 /* FT_FloorFix */ 3603 /* FT_Vector_Transform */ 3604 /* FT_Matrix_Multiply */ 3605 /* FT_Matrix_Invert */ 3606 /* */ 3607 /*************************************************************************/ 3608 3609 3610 /*************************************************************************/ 3611 /* */ 3612 /* <Function> */ 3613 /* FT_MulDiv */ 3614 /* */ 3615 /* <Description> */ 3616 /* A very simple function used to perform the computation `(a*b)/c' */ 3617 /* with maximal accuracy (it uses a 64-bit intermediate integer */ 3618 /* whenever necessary). */ 3619 /* */ 3620 /* This function isn't necessarily as fast as some processor specific */ 3621 /* operations, but is at least completely portable. */ 3622 /* */ 3623 /* <Input> */ 3624 /* a :: The first multiplier. */ 3625 /* b :: The second multiplier. */ 3626 /* c :: The divisor. */ 3627 /* */ 3628 /* <Return> */ 3629 /* The result of `(a*b)/c'. This function never traps when trying to */ 3630 /* divide by zero; it simply returns `MaxInt' or `MinInt' depending */ 3631 /* on the signs of `a' and `b'. */ 3632 /* */ 3633 FT_EXPORT( FT_Long ) 3634 FT_MulDiv( FT_Long a, 3635 FT_Long b, 3636 FT_Long c ); 3637 3638 3639 /* */ 3640 3641 /* The following #if 0 ... #endif is for the documentation formatter, */ 3642 /* hiding the internal `FT_MULFIX_INLINED' macro. */ 3643 3644#if 0 3645 /*************************************************************************/ 3646 /* */ 3647 /* <Function> */ 3648 /* FT_MulFix */ 3649 /* */ 3650 /* <Description> */ 3651 /* A very simple function used to perform the computation */ 3652 /* `(a*b)/0x10000' with maximal accuracy. Most of the time this is */ 3653 /* used to multiply a given value by a 16.16 fixed float factor. */ 3654 /* */ 3655 /* <Input> */ 3656 /* a :: The first multiplier. */ 3657 /* b :: The second multiplier. Use a 16.16 factor here whenever */ 3658 /* possible (see note below). */ 3659 /* */ 3660 /* <Return> */ 3661 /* The result of `(a*b)/0x10000'. */ 3662 /* */ 3663 /* <Note> */ 3664 /* This function has been optimized for the case where the absolute */ 3665 /* value of `a' is less than 2048, and `b' is a 16.16 scaling factor. */ 3666 /* As this happens mainly when scaling from notional units to */ 3667 /* fractional pixels in FreeType, it resulted in noticeable speed */ 3668 /* improvements between versions 2.x and 1.x. */ 3669 /* */ 3670 /* As a conclusion, always try to place a 16.16 factor as the */ 3671 /* _second_ argument of this function; this can make a great */ 3672 /* difference. */ 3673 /* */ 3674 FT_EXPORT( FT_Long ) 3675 FT_MulFix( FT_Long a, 3676 FT_Long b ); 3677 3678 /* */ 3679#endif 3680 3681#ifdef FT_MULFIX_INLINED 3682#define FT_MulFix( a, b ) FT_MULFIX_INLINED( a, b ) 3683#else 3684 FT_EXPORT( FT_Long ) 3685 FT_MulFix( FT_Long a, 3686 FT_Long b ); 3687#endif 3688 3689 3690 /*************************************************************************/ 3691 /* */ 3692 /* <Function> */ 3693 /* FT_DivFix */ 3694 /* */ 3695 /* <Description> */ 3696 /* A very simple function used to perform the computation */ 3697 /* `(a*0x10000)/b' with maximal accuracy. Most of the time, this is */ 3698 /* used to divide a given value by a 16.16 fixed float factor. */ 3699 /* */ 3700 /* <Input> */ 3701 /* a :: The first multiplier. */ 3702 /* b :: The second multiplier. Use a 16.16 factor here whenever */ 3703 /* possible (see note below). */ 3704 /* */ 3705 /* <Return> */ 3706 /* The result of `(a*0x10000)/b'. */ 3707 /* */ 3708 /* <Note> */ 3709 /* The optimization for FT_DivFix() is simple: If (a~<<~16) fits in */ 3710 /* 32~bits, then the division is computed directly. Otherwise, we */ 3711 /* use a specialized version of @FT_MulDiv. */ 3712 /* */ 3713 FT_EXPORT( FT_Long ) 3714 FT_DivFix( FT_Long a, 3715 FT_Long b ); 3716 3717 3718 /*************************************************************************/ 3719 /* */ 3720 /* <Function> */ 3721 /* FT_RoundFix */ 3722 /* */ 3723 /* <Description> */ 3724 /* A very simple function used to round a 16.16 fixed number. */ 3725 /* */ 3726 /* <Input> */ 3727 /* a :: The number to be rounded. */ 3728 /* */ 3729 /* <Return> */ 3730 /* The result of `(a + 0x8000) & -0x10000'. */ 3731 /* */ 3732 FT_EXPORT( FT_Fixed ) 3733 FT_RoundFix( FT_Fixed a ); 3734 3735 3736 /*************************************************************************/ 3737 /* */ 3738 /* <Function> */ 3739 /* FT_CeilFix */ 3740 /* */ 3741 /* <Description> */ 3742 /* A very simple function used to compute the ceiling function of a */ 3743 /* 16.16 fixed number. */ 3744 /* */ 3745 /* <Input> */ 3746 /* a :: The number for which the ceiling function is to be computed. */ 3747 /* */ 3748 /* <Return> */ 3749 /* The result of `(a + 0x10000 - 1) & -0x10000'. */ 3750 /* */ 3751 FT_EXPORT( FT_Fixed ) 3752 FT_CeilFix( FT_Fixed a ); 3753 3754 3755 /*************************************************************************/ 3756 /* */ 3757 /* <Function> */ 3758 /* FT_FloorFix */ 3759 /* */ 3760 /* <Description> */ 3761 /* A very simple function used to compute the floor function of a */ 3762 /* 16.16 fixed number. */ 3763 /* */ 3764 /* <Input> */ 3765 /* a :: The number for which the floor function is to be computed. */ 3766 /* */ 3767 /* <Return> */ 3768 /* The result of `a & -0x10000'. */ 3769 /* */ 3770 FT_EXPORT( FT_Fixed ) 3771 FT_FloorFix( FT_Fixed a ); 3772 3773 3774 /*************************************************************************/ 3775 /* */ 3776 /* <Function> */ 3777 /* FT_Vector_Transform */ 3778 /* */ 3779 /* <Description> */ 3780 /* Transform a single vector through a 2x2 matrix. */ 3781 /* */ 3782 /* <InOut> */ 3783 /* vector :: The target vector to transform. */ 3784 /* */ 3785 /* <Input> */ 3786 /* matrix :: A pointer to the source 2x2 matrix. */ 3787 /* */ 3788 /* <Note> */ 3789 /* The result is undefined if either `vector' or `matrix' is invalid. */ 3790 /* */ 3791 FT_EXPORT( void ) 3792 FT_Vector_Transform( FT_Vector* vec, 3793 const FT_Matrix* matrix ); 3794 3795 3796 /*************************************************************************/ 3797 /* */ 3798 /* <Section> */ 3799 /* version */ 3800 /* */ 3801 /* <Title> */ 3802 /* FreeType Version */ 3803 /* */ 3804 /* <Abstract> */ 3805 /* Functions and macros related to FreeType versions. */ 3806 /* */ 3807 /* <Description> */ 3808 /* Note that those functions and macros are of limited use because */ 3809 /* even a new release of FreeType with only documentation changes */ 3810 /* increases the version number. */ 3811 /* */ 3812 /*************************************************************************/ 3813 3814 3815 /************************************************************************* 3816 * 3817 * @enum: 3818 * FREETYPE_XXX 3819 * 3820 * @description: 3821 * These three macros identify the FreeType source code version. 3822 * Use @FT_Library_Version to access them at runtime. 3823 * 3824 * @values: 3825 * FREETYPE_MAJOR :: The major version number. 3826 * FREETYPE_MINOR :: The minor version number. 3827 * FREETYPE_PATCH :: The patch level. 3828 * 3829 * @note: 3830 * The version number of FreeType if built as a dynamic link library 3831 * with the `libtool' package is _not_ controlled by these three 3832 * macros. 3833 * 3834 */ 3835#define FREETYPE_MAJOR 2 3836#define FREETYPE_MINOR 4 3837#define FREETYPE_PATCH 9 3838 3839 3840 /*************************************************************************/ 3841 /* */ 3842 /* <Function> */ 3843 /* FT_Library_Version */ 3844 /* */ 3845 /* <Description> */ 3846 /* Return the version of the FreeType library being used. This is */ 3847 /* useful when dynamically linking to the library, since one cannot */ 3848 /* use the macros @FREETYPE_MAJOR, @FREETYPE_MINOR, and */ 3849 /* @FREETYPE_PATCH. */ 3850 /* */ 3851 /* <Input> */ 3852 /* library :: A source library handle. */ 3853 /* */ 3854 /* <Output> */ 3855 /* amajor :: The major version number. */ 3856 /* */ 3857 /* aminor :: The minor version number. */ 3858 /* */ 3859 /* apatch :: The patch version number. */ 3860 /* */ 3861 /* <Note> */ 3862 /* The reason why this function takes a `library' argument is because */ 3863 /* certain programs implement library initialization in a custom way */ 3864 /* that doesn't use @FT_Init_FreeType. */ 3865 /* */ 3866 /* In such cases, the library version might not be available before */ 3867 /* the library object has been created. */ 3868 /* */ 3869 FT_EXPORT( void ) 3870 FT_Library_Version( FT_Library library, 3871 FT_Int *amajor, 3872 FT_Int *aminor, 3873 FT_Int *apatch ); 3874 3875 3876 /*************************************************************************/ 3877 /* */ 3878 /* <Function> */ 3879 /* FT_Face_CheckTrueTypePatents */ 3880 /* */ 3881 /* <Description> */ 3882 /* Parse all bytecode instructions of a TrueType font file to check */ 3883 /* whether any of the patented opcodes are used. This is only useful */ 3884 /* if you want to be able to use the unpatented hinter with */ 3885 /* fonts that do *not* use these opcodes. */ 3886 /* */ 3887 /* Note that this function parses *all* glyph instructions in the */ 3888 /* font file, which may be slow. */ 3889 /* */ 3890 /* <Input> */ 3891 /* face :: A face handle. */ 3892 /* */ 3893 /* <Return> */ 3894 /* 1~if this is a TrueType font that uses one of the patented */ 3895 /* opcodes, 0~otherwise. */ 3896 /* */ 3897 /* <Note> */ 3898 /* Since May 2010, TrueType hinting is no longer patented. */ 3899 /* */ 3900 /* <Since> */ 3901 /* 2.3.5 */ 3902 /* */ 3903 FT_EXPORT( FT_Bool ) 3904 FT_Face_CheckTrueTypePatents( FT_Face face ); 3905 3906 3907 /*************************************************************************/ 3908 /* */ 3909 /* <Function> */ 3910 /* FT_Face_SetUnpatentedHinting */ 3911 /* */ 3912 /* <Description> */ 3913 /* Enable or disable the unpatented hinter for a given face. */ 3914 /* Only enable it if you have determined that the face doesn't */ 3915 /* use any patented opcodes (see @FT_Face_CheckTrueTypePatents). */ 3916 /* */ 3917 /* <Input> */ 3918 /* face :: A face handle. */ 3919 /* */ 3920 /* value :: New boolean setting. */ 3921 /* */ 3922 /* <Return> */ 3923 /* The old setting value. This will always be false if this is not */ 3924 /* an SFNT font, or if the unpatented hinter is not compiled in this */ 3925 /* instance of the library. */ 3926 /* */ 3927 /* <Note> */ 3928 /* Since May 2010, TrueType hinting is no longer patented. */ 3929 /* */ 3930 /* <Since> */ 3931 /* 2.3.5 */ 3932 /* */ 3933 FT_EXPORT( FT_Bool ) 3934 FT_Face_SetUnpatentedHinting( FT_Face face, 3935 FT_Bool value ); 3936 3937 /* */ 3938 3939 3940FT_END_HEADER 3941 3942#endif /* __FREETYPE_H__ */ 3943 3944 3945/* END */ 3946