/src/compiler/android-ndk/jni/freetype/include/freetype/ftimage.h
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1/***************************************************************************/ 2/* */ 3/* ftimage.h */ 4/* */ 5/* FreeType glyph image formats and default raster interface */ 6/* (specification). */ 7/* */ 8/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, */ 9/* 2010 by */ 10/* David Turner, Robert Wilhelm, and Werner Lemberg. */ 11/* */ 12/* This file is part of the FreeType project, and may only be used, */ 13/* modified, and distributed under the terms of the FreeType project */ 14/* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 15/* this file you indicate that you have read the license and */ 16/* understand and accept it fully. */ 17/* */ 18/***************************************************************************/ 19 20 /*************************************************************************/ 21 /* */ 22 /* Note: A `raster' is simply a scan-line converter, used to render */ 23 /* FT_Outlines into FT_Bitmaps. */ 24 /* */ 25 /*************************************************************************/ 26 27 28#ifndef __FTIMAGE_H__ 29#define __FTIMAGE_H__ 30 31 32 /* _STANDALONE_ is from ftgrays.c */ 33#ifndef _STANDALONE_ 34#include <ft2build.h> 35#endif 36 37 38FT_BEGIN_HEADER 39 40 41 /*************************************************************************/ 42 /* */ 43 /* <Section> */ 44 /* basic_types */ 45 /* */ 46 /*************************************************************************/ 47 48 49 /*************************************************************************/ 50 /* */ 51 /* <Type> */ 52 /* FT_Pos */ 53 /* */ 54 /* <Description> */ 55 /* The type FT_Pos is used to store vectorial coordinates. Depending */ 56 /* on the context, these can represent distances in integer font */ 57 /* units, or 16.16, or 26.6 fixed float pixel coordinates. */ 58 /* */ 59 typedef signed long FT_Pos; 60 61 62 /*************************************************************************/ 63 /* */ 64 /* <Struct> */ 65 /* FT_Vector */ 66 /* */ 67 /* <Description> */ 68 /* A simple structure used to store a 2D vector; coordinates are of */ 69 /* the FT_Pos type. */ 70 /* */ 71 /* <Fields> */ 72 /* x :: The horizontal coordinate. */ 73 /* y :: The vertical coordinate. */ 74 /* */ 75 typedef struct FT_Vector_ 76 { 77 FT_Pos x; 78 FT_Pos y; 79 80 } FT_Vector; 81 82 83 /*************************************************************************/ 84 /* */ 85 /* <Struct> */ 86 /* FT_BBox */ 87 /* */ 88 /* <Description> */ 89 /* A structure used to hold an outline's bounding box, i.e., the */ 90 /* coordinates of its extrema in the horizontal and vertical */ 91 /* directions. */ 92 /* */ 93 /* <Fields> */ 94 /* xMin :: The horizontal minimum (left-most). */ 95 /* */ 96 /* yMin :: The vertical minimum (bottom-most). */ 97 /* */ 98 /* xMax :: The horizontal maximum (right-most). */ 99 /* */ 100 /* yMax :: The vertical maximum (top-most). */ 101 /* */ 102 /* <Note> */ 103 /* The bounding box is specified with the coordinates of the lower */ 104 /* left and the upper right corner. In PostScript, those values are */ 105 /* often called (llx,lly) and (urx,ury), respectively. */ 106 /* */ 107 /* If `yMin' is negative, this value gives the glyph's descender. */ 108 /* Otherwise, the glyph doesn't descend below the baseline. */ 109 /* Similarly, if `ymax' is positive, this value gives the glyph's */ 110 /* ascender. */ 111 /* */ 112 /* `xMin' gives the horizontal distance from the glyph's origin to */ 113 /* the left edge of the glyph's bounding box. If `xMin' is negative, */ 114 /* the glyph extends to the left of the origin. */ 115 /* */ 116 typedef struct FT_BBox_ 117 { 118 FT_Pos xMin, yMin; 119 FT_Pos xMax, yMax; 120 121 } FT_BBox; 122 123 124 /*************************************************************************/ 125 /* */ 126 /* <Enum> */ 127 /* FT_Pixel_Mode */ 128 /* */ 129 /* <Description> */ 130 /* An enumeration type used to describe the format of pixels in a */ 131 /* given bitmap. Note that additional formats may be added in the */ 132 /* future. */ 133 /* */ 134 /* <Values> */ 135 /* FT_PIXEL_MODE_NONE :: */ 136 /* Value~0 is reserved. */ 137 /* */ 138 /* FT_PIXEL_MODE_MONO :: */ 139 /* A monochrome bitmap, using 1~bit per pixel. Note that pixels */ 140 /* are stored in most-significant order (MSB), which means that */ 141 /* the left-most pixel in a byte has value 128. */ 142 /* */ 143 /* FT_PIXEL_MODE_GRAY :: */ 144 /* An 8-bit bitmap, generally used to represent anti-aliased glyph */ 145 /* images. Each pixel is stored in one byte. Note that the number */ 146 /* of `gray' levels is stored in the `num_grays' field of the */ 147 /* @FT_Bitmap structure (it generally is 256). */ 148 /* */ 149 /* FT_PIXEL_MODE_GRAY2 :: */ 150 /* A 2-bit per pixel bitmap, used to represent embedded */ 151 /* anti-aliased bitmaps in font files according to the OpenType */ 152 /* specification. We haven't found a single font using this */ 153 /* format, however. */ 154 /* */ 155 /* FT_PIXEL_MODE_GRAY4 :: */ 156 /* A 4-bit per pixel bitmap, representing embedded anti-aliased */ 157 /* bitmaps in font files according to the OpenType specification. */ 158 /* We haven't found a single font using this format, however. */ 159 /* */ 160 /* FT_PIXEL_MODE_LCD :: */ 161 /* An 8-bit bitmap, representing RGB or BGR decimated glyph images */ 162 /* used for display on LCD displays; the bitmap is three times */ 163 /* wider than the original glyph image. See also */ 164 /* @FT_RENDER_MODE_LCD. */ 165 /* */ 166 /* FT_PIXEL_MODE_LCD_V :: */ 167 /* An 8-bit bitmap, representing RGB or BGR decimated glyph images */ 168 /* used for display on rotated LCD displays; the bitmap is three */ 169 /* times taller than the original glyph image. See also */ 170 /* @FT_RENDER_MODE_LCD_V. */ 171 /* */ 172 typedef enum FT_Pixel_Mode_ 173 { 174 FT_PIXEL_MODE_NONE = 0, 175 FT_PIXEL_MODE_MONO, 176 FT_PIXEL_MODE_GRAY, 177 FT_PIXEL_MODE_GRAY2, 178 FT_PIXEL_MODE_GRAY4, 179 FT_PIXEL_MODE_LCD, 180 FT_PIXEL_MODE_LCD_V, 181 182 FT_PIXEL_MODE_MAX /* do not remove */ 183 184 } FT_Pixel_Mode; 185 186 187 /*************************************************************************/ 188 /* */ 189 /* <Enum> */ 190 /* ft_pixel_mode_xxx */ 191 /* */ 192 /* <Description> */ 193 /* A list of deprecated constants. Use the corresponding */ 194 /* @FT_Pixel_Mode values instead. */ 195 /* */ 196 /* <Values> */ 197 /* ft_pixel_mode_none :: See @FT_PIXEL_MODE_NONE. */ 198 /* ft_pixel_mode_mono :: See @FT_PIXEL_MODE_MONO. */ 199 /* ft_pixel_mode_grays :: See @FT_PIXEL_MODE_GRAY. */ 200 /* ft_pixel_mode_pal2 :: See @FT_PIXEL_MODE_GRAY2. */ 201 /* ft_pixel_mode_pal4 :: See @FT_PIXEL_MODE_GRAY4. */ 202 /* */ 203#define ft_pixel_mode_none FT_PIXEL_MODE_NONE 204#define ft_pixel_mode_mono FT_PIXEL_MODE_MONO 205#define ft_pixel_mode_grays FT_PIXEL_MODE_GRAY 206#define ft_pixel_mode_pal2 FT_PIXEL_MODE_GRAY2 207#define ft_pixel_mode_pal4 FT_PIXEL_MODE_GRAY4 208 209 /* */ 210 211#if 0 212 213 /*************************************************************************/ 214 /* */ 215 /* <Enum> */ 216 /* FT_Palette_Mode */ 217 /* */ 218 /* <Description> */ 219 /* THIS TYPE IS DEPRECATED. DO NOT USE IT! */ 220 /* */ 221 /* An enumeration type to describe the format of a bitmap palette, */ 222 /* used with ft_pixel_mode_pal4 and ft_pixel_mode_pal8. */ 223 /* */ 224 /* <Values> */ 225 /* ft_palette_mode_rgb :: The palette is an array of 3-byte RGB */ 226 /* records. */ 227 /* */ 228 /* ft_palette_mode_rgba :: The palette is an array of 4-byte RGBA */ 229 /* records. */ 230 /* */ 231 /* <Note> */ 232 /* As ft_pixel_mode_pal2, pal4 and pal8 are currently unused by */ 233 /* FreeType, these types are not handled by the library itself. */ 234 /* */ 235 typedef enum FT_Palette_Mode_ 236 { 237 ft_palette_mode_rgb = 0, 238 ft_palette_mode_rgba, 239 240 ft_palette_mode_max /* do not remove */ 241 242 } FT_Palette_Mode; 243 244 /* */ 245 246#endif 247 248 249 /*************************************************************************/ 250 /* */ 251 /* <Struct> */ 252 /* FT_Bitmap */ 253 /* */ 254 /* <Description> */ 255 /* A structure used to describe a bitmap or pixmap to the raster. */ 256 /* Note that we now manage pixmaps of various depths through the */ 257 /* `pixel_mode' field. */ 258 /* */ 259 /* <Fields> */ 260 /* rows :: The number of bitmap rows. */ 261 /* */ 262 /* width :: The number of pixels in bitmap row. */ 263 /* */ 264 /* pitch :: The pitch's absolute value is the number of bytes */ 265 /* taken by one bitmap row, including padding. */ 266 /* However, the pitch is positive when the bitmap has */ 267 /* a `down' flow, and negative when it has an `up' */ 268 /* flow. In all cases, the pitch is an offset to add */ 269 /* to a bitmap pointer in order to go down one row. */ 270 /* */ 271 /* For the B/W rasterizer, `pitch' is always an even */ 272 /* number. */ 273 /* */ 274 /* buffer :: A typeless pointer to the bitmap buffer. This */ 275 /* value should be aligned on 32-bit boundaries in */ 276 /* most cases. */ 277 /* */ 278 /* num_grays :: This field is only used with */ 279 /* @FT_PIXEL_MODE_GRAY; it gives the number of gray */ 280 /* levels used in the bitmap. */ 281 /* */ 282 /* pixel_mode :: The pixel mode, i.e., how pixel bits are stored. */ 283 /* See @FT_Pixel_Mode for possible values. */ 284 /* */ 285 /* palette_mode :: This field is intended for paletted pixel modes; */ 286 /* it indicates how the palette is stored. Not */ 287 /* used currently. */ 288 /* */ 289 /* palette :: A typeless pointer to the bitmap palette; this */ 290 /* field is intended for paletted pixel modes. Not */ 291 /* used currently. */ 292 /* */ 293 /* <Note> */ 294 /* For now, the only pixel modes supported by FreeType are mono and */ 295 /* grays. However, drivers might be added in the future to support */ 296 /* more `colorful' options. */ 297 /* */ 298 typedef struct FT_Bitmap_ 299 { 300 int rows; 301 int width; 302 int pitch; 303 unsigned char* buffer; 304 short num_grays; 305 char pixel_mode; 306 char palette_mode; 307 void* palette; 308 309 } FT_Bitmap; 310 311 312 /*************************************************************************/ 313 /* */ 314 /* <Section> */ 315 /* outline_processing */ 316 /* */ 317 /*************************************************************************/ 318 319 320 /*************************************************************************/ 321 /* */ 322 /* <Struct> */ 323 /* FT_Outline */ 324 /* */ 325 /* <Description> */ 326 /* This structure is used to describe an outline to the scan-line */ 327 /* converter. */ 328 /* */ 329 /* <Fields> */ 330 /* n_contours :: The number of contours in the outline. */ 331 /* */ 332 /* n_points :: The number of points in the outline. */ 333 /* */ 334 /* points :: A pointer to an array of `n_points' @FT_Vector */ 335 /* elements, giving the outline's point coordinates. */ 336 /* */ 337 /* tags :: A pointer to an array of `n_points' chars, giving */ 338 /* each outline point's type. */ 339 /* */ 340 /* If bit~0 is unset, the point is `off' the curve, */ 341 /* i.e., a Bézier control point, while it is `on' if */ 342 /* set. */ 343 /* */ 344 /* Bit~1 is meaningful for `off' points only. If set, */ 345 /* it indicates a third-order Bézier arc control point; */ 346 /* and a second-order control point if unset. */ 347 /* */ 348 /* If bit~2 is set, bits 5-7 contain the drop-out mode */ 349 /* (as defined in the OpenType specification; the value */ 350 /* is the same as the argument to the SCANMODE */ 351 /* instruction). */ 352 /* */ 353 /* Bits 3 and~4 are reserved for internal purposes. */ 354 /* */ 355 /* contours :: An array of `n_contours' shorts, giving the end */ 356 /* point of each contour within the outline. For */ 357 /* example, the first contour is defined by the points */ 358 /* `0' to `contours[0]', the second one is defined by */ 359 /* the points `contours[0]+1' to `contours[1]', etc. */ 360 /* */ 361 /* flags :: A set of bit flags used to characterize the outline */ 362 /* and give hints to the scan-converter and hinter on */ 363 /* how to convert/grid-fit it. See @FT_OUTLINE_FLAGS. */ 364 /* */ 365 /* <Note> */ 366 /* The B/W rasterizer only checks bit~2 in the `tags' array for the */ 367 /* first point of each contour. The drop-out mode as given with */ 368 /* @FT_OUTLINE_IGNORE_DROPOUTS, @FT_OUTLINE_SMART_DROPOUTS, and */ 369 /* @FT_OUTLINE_INCLUDE_STUBS in `flags' is then overridden. */ 370 /* */ 371 typedef struct FT_Outline_ 372 { 373 short n_contours; /* number of contours in glyph */ 374 short n_points; /* number of points in the glyph */ 375 376 FT_Vector* points; /* the outline's points */ 377 char* tags; /* the points flags */ 378 short* contours; /* the contour end points */ 379 380 int flags; /* outline masks */ 381 382 } FT_Outline; 383 384 /* Following limits must be consistent with */ 385 /* FT_Outline.{n_contours,n_points} */ 386#define FT_OUTLINE_CONTOURS_MAX SHRT_MAX 387#define FT_OUTLINE_POINTS_MAX SHRT_MAX 388 389 390 /*************************************************************************/ 391 /* */ 392 /* <Enum> */ 393 /* FT_OUTLINE_FLAGS */ 394 /* */ 395 /* <Description> */ 396 /* A list of bit-field constants use for the flags in an outline's */ 397 /* `flags' field. */ 398 /* */ 399 /* <Values> */ 400 /* FT_OUTLINE_NONE :: */ 401 /* Value~0 is reserved. */ 402 /* */ 403 /* FT_OUTLINE_OWNER :: */ 404 /* If set, this flag indicates that the outline's field arrays */ 405 /* (i.e., `points', `flags', and `contours') are `owned' by the */ 406 /* outline object, and should thus be freed when it is destroyed. */ 407 /* */ 408 /* FT_OUTLINE_EVEN_ODD_FILL :: */ 409 /* By default, outlines are filled using the non-zero winding rule. */ 410 /* If set to 1, the outline will be filled using the even-odd fill */ 411 /* rule (only works with the smooth rasterizer). */ 412 /* */ 413 /* FT_OUTLINE_REVERSE_FILL :: */ 414 /* By default, outside contours of an outline are oriented in */ 415 /* clock-wise direction, as defined in the TrueType specification. */ 416 /* This flag is set if the outline uses the opposite direction */ 417 /* (typically for Type~1 fonts). This flag is ignored by the scan */ 418 /* converter. */ 419 /* */ 420 /* FT_OUTLINE_IGNORE_DROPOUTS :: */ 421 /* By default, the scan converter will try to detect drop-outs in */ 422 /* an outline and correct the glyph bitmap to ensure consistent */ 423 /* shape continuity. If set, this flag hints the scan-line */ 424 /* converter to ignore such cases. See below for more information. */ 425 /* */ 426 /* FT_OUTLINE_SMART_DROPOUTS :: */ 427 /* Select smart dropout control. If unset, use simple dropout */ 428 /* control. Ignored if @FT_OUTLINE_IGNORE_DROPOUTS is set. See */ 429 /* below for more information. */ 430 /* */ 431 /* FT_OUTLINE_INCLUDE_STUBS :: */ 432 /* If set, turn pixels on for `stubs', otherwise exclude them. */ 433 /* Ignored if @FT_OUTLINE_IGNORE_DROPOUTS is set. See below for */ 434 /* more information. */ 435 /* */ 436 /* FT_OUTLINE_HIGH_PRECISION :: */ 437 /* This flag indicates that the scan-line converter should try to */ 438 /* convert this outline to bitmaps with the highest possible */ 439 /* quality. It is typically set for small character sizes. Note */ 440 /* that this is only a hint that might be completely ignored by a */ 441 /* given scan-converter. */ 442 /* */ 443 /* FT_OUTLINE_SINGLE_PASS :: */ 444 /* This flag is set to force a given scan-converter to only use a */ 445 /* single pass over the outline to render a bitmap glyph image. */ 446 /* Normally, it is set for very large character sizes. It is only */ 447 /* a hint that might be completely ignored by a given */ 448 /* scan-converter. */ 449 /* */ 450 /* <Note> */ 451 /* The flags @FT_OUTLINE_IGNORE_DROPOUTS, @FT_OUTLINE_SMART_DROPOUTS, */ 452 /* and @FT_OUTLINE_INCLUDE_STUBS are ignored by the smooth */ 453 /* rasterizer. */ 454 /* */ 455 /* There exists a second mechanism to pass the drop-out mode to the */ 456 /* B/W rasterizer; see the `tags' field in @FT_Outline. */ 457 /* */ 458 /* Please refer to the description of the `SCANTYPE' instruction in */ 459 /* the OpenType specification (in file `ttinst1.doc') how simple */ 460 /* drop-outs, smart drop-outs, and stubs are defined. */ 461 /* */ 462#define FT_OUTLINE_NONE 0x0 463#define FT_OUTLINE_OWNER 0x1 464#define FT_OUTLINE_EVEN_ODD_FILL 0x2 465#define FT_OUTLINE_REVERSE_FILL 0x4 466#define FT_OUTLINE_IGNORE_DROPOUTS 0x8 467#define FT_OUTLINE_SMART_DROPOUTS 0x10 468#define FT_OUTLINE_INCLUDE_STUBS 0x20 469 470#define FT_OUTLINE_HIGH_PRECISION 0x100 471#define FT_OUTLINE_SINGLE_PASS 0x200 472 473 474 /************************************************************************* 475 * 476 * @enum: 477 * ft_outline_flags 478 * 479 * @description: 480 * These constants are deprecated. Please use the corresponding 481 * @FT_OUTLINE_FLAGS values. 482 * 483 * @values: 484 * ft_outline_none :: See @FT_OUTLINE_NONE. 485 * ft_outline_owner :: See @FT_OUTLINE_OWNER. 486 * ft_outline_even_odd_fill :: See @FT_OUTLINE_EVEN_ODD_FILL. 487 * ft_outline_reverse_fill :: See @FT_OUTLINE_REVERSE_FILL. 488 * ft_outline_ignore_dropouts :: See @FT_OUTLINE_IGNORE_DROPOUTS. 489 * ft_outline_high_precision :: See @FT_OUTLINE_HIGH_PRECISION. 490 * ft_outline_single_pass :: See @FT_OUTLINE_SINGLE_PASS. 491 */ 492#define ft_outline_none FT_OUTLINE_NONE 493#define ft_outline_owner FT_OUTLINE_OWNER 494#define ft_outline_even_odd_fill FT_OUTLINE_EVEN_ODD_FILL 495#define ft_outline_reverse_fill FT_OUTLINE_REVERSE_FILL 496#define ft_outline_ignore_dropouts FT_OUTLINE_IGNORE_DROPOUTS 497#define ft_outline_high_precision FT_OUTLINE_HIGH_PRECISION 498#define ft_outline_single_pass FT_OUTLINE_SINGLE_PASS 499 500 /* */ 501 502#define FT_CURVE_TAG( flag ) ( flag & 3 ) 503 504#define FT_CURVE_TAG_ON 1 505#define FT_CURVE_TAG_CONIC 0 506#define FT_CURVE_TAG_CUBIC 2 507 508#define FT_CURVE_TAG_HAS_SCANMODE 4 509 510#define FT_CURVE_TAG_TOUCH_X 8 /* reserved for the TrueType hinter */ 511#define FT_CURVE_TAG_TOUCH_Y 16 /* reserved for the TrueType hinter */ 512 513#define FT_CURVE_TAG_TOUCH_BOTH ( FT_CURVE_TAG_TOUCH_X | \ 514 FT_CURVE_TAG_TOUCH_Y ) 515 516#define FT_Curve_Tag_On FT_CURVE_TAG_ON 517#define FT_Curve_Tag_Conic FT_CURVE_TAG_CONIC 518#define FT_Curve_Tag_Cubic FT_CURVE_TAG_CUBIC 519#define FT_Curve_Tag_Touch_X FT_CURVE_TAG_TOUCH_X 520#define FT_Curve_Tag_Touch_Y FT_CURVE_TAG_TOUCH_Y 521 522 523 /*************************************************************************/ 524 /* */ 525 /* <FuncType> */ 526 /* FT_Outline_MoveToFunc */ 527 /* */ 528 /* <Description> */ 529 /* A function pointer type used to describe the signature of a `move */ 530 /* to' function during outline walking/decomposition. */ 531 /* */ 532 /* A `move to' is emitted to start a new contour in an outline. */ 533 /* */ 534 /* <Input> */ 535 /* to :: A pointer to the target point of the `move to'. */ 536 /* */ 537 /* user :: A typeless pointer which is passed from the caller of the */ 538 /* decomposition function. */ 539 /* */ 540 /* <Return> */ 541 /* Error code. 0~means success. */ 542 /* */ 543 typedef int 544 (*FT_Outline_MoveToFunc)( const FT_Vector* to, 545 void* user ); 546 547#define FT_Outline_MoveTo_Func FT_Outline_MoveToFunc 548 549 550 /*************************************************************************/ 551 /* */ 552 /* <FuncType> */ 553 /* FT_Outline_LineToFunc */ 554 /* */ 555 /* <Description> */ 556 /* A function pointer type used to describe the signature of a `line */ 557 /* to' function during outline walking/decomposition. */ 558 /* */ 559 /* A `line to' is emitted to indicate a segment in the outline. */ 560 /* */ 561 /* <Input> */ 562 /* to :: A pointer to the target point of the `line to'. */ 563 /* */ 564 /* user :: A typeless pointer which is passed from the caller of the */ 565 /* decomposition function. */ 566 /* */ 567 /* <Return> */ 568 /* Error code. 0~means success. */ 569 /* */ 570 typedef int 571 (*FT_Outline_LineToFunc)( const FT_Vector* to, 572 void* user ); 573 574#define FT_Outline_LineTo_Func FT_Outline_LineToFunc 575 576 577 /*************************************************************************/ 578 /* */ 579 /* <FuncType> */ 580 /* FT_Outline_ConicToFunc */ 581 /* */ 582 /* <Description> */ 583 /* A function pointer type used to describe the signature of a `conic */ 584 /* to' function during outline walking or decomposition. */ 585 /* */ 586 /* A `conic to' is emitted to indicate a second-order Bézier arc in */ 587 /* the outline. */ 588 /* */ 589 /* <Input> */ 590 /* control :: An intermediate control point between the last position */ 591 /* and the new target in `to'. */ 592 /* */ 593 /* to :: A pointer to the target end point of the conic arc. */ 594 /* */ 595 /* user :: A typeless pointer which is passed from the caller of */ 596 /* the decomposition function. */ 597 /* */ 598 /* <Return> */ 599 /* Error code. 0~means success. */ 600 /* */ 601 typedef int 602 (*FT_Outline_ConicToFunc)( const FT_Vector* control, 603 const FT_Vector* to, 604 void* user ); 605 606#define FT_Outline_ConicTo_Func FT_Outline_ConicToFunc 607 608 609 /*************************************************************************/ 610 /* */ 611 /* <FuncType> */ 612 /* FT_Outline_CubicToFunc */ 613 /* */ 614 /* <Description> */ 615 /* A function pointer type used to describe the signature of a `cubic */ 616 /* to' function during outline walking or decomposition. */ 617 /* */ 618 /* A `cubic to' is emitted to indicate a third-order Bézier arc. */ 619 /* */ 620 /* <Input> */ 621 /* control1 :: A pointer to the first Bézier control point. */ 622 /* */ 623 /* control2 :: A pointer to the second Bézier control point. */ 624 /* */ 625 /* to :: A pointer to the target end point. */ 626 /* */ 627 /* user :: A typeless pointer which is passed from the caller of */ 628 /* the decomposition function. */ 629 /* */ 630 /* <Return> */ 631 /* Error code. 0~means success. */ 632 /* */ 633 typedef int 634 (*FT_Outline_CubicToFunc)( const FT_Vector* control1, 635 const FT_Vector* control2, 636 const FT_Vector* to, 637 void* user ); 638 639#define FT_Outline_CubicTo_Func FT_Outline_CubicToFunc 640 641 642 /*************************************************************************/ 643 /* */ 644 /* <Struct> */ 645 /* FT_Outline_Funcs */ 646 /* */ 647 /* <Description> */ 648 /* A structure to hold various function pointers used during outline */ 649 /* decomposition in order to emit segments, conic, and cubic Béziers. */ 650 /* */ 651 /* <Fields> */ 652 /* move_to :: The `move to' emitter. */ 653 /* */ 654 /* line_to :: The segment emitter. */ 655 /* */ 656 /* conic_to :: The second-order Bézier arc emitter. */ 657 /* */ 658 /* cubic_to :: The third-order Bézier arc emitter. */ 659 /* */ 660 /* shift :: The shift that is applied to coordinates before they */ 661 /* are sent to the emitter. */ 662 /* */ 663 /* delta :: The delta that is applied to coordinates before they */ 664 /* are sent to the emitter, but after the shift. */ 665 /* */ 666 /* <Note> */ 667 /* The point coordinates sent to the emitters are the transformed */ 668 /* version of the original coordinates (this is important for high */ 669 /* accuracy during scan-conversion). The transformation is simple: */ 670 /* */ 671 /* { */ 672 /* x' = (x << shift) - delta */ 673 /* y' = (x << shift) - delta */ 674 /* } */ 675 /* */ 676 /* Set the values of `shift' and `delta' to~0 to get the original */ 677 /* point coordinates. */ 678 /* */ 679 typedef struct FT_Outline_Funcs_ 680 { 681 FT_Outline_MoveToFunc move_to; 682 FT_Outline_LineToFunc line_to; 683 FT_Outline_ConicToFunc conic_to; 684 FT_Outline_CubicToFunc cubic_to; 685 686 int shift; 687 FT_Pos delta; 688 689 } FT_Outline_Funcs; 690 691 692 /*************************************************************************/ 693 /* */ 694 /* <Section> */ 695 /* basic_types */ 696 /* */ 697 /*************************************************************************/ 698 699 700 /*************************************************************************/ 701 /* */ 702 /* <Macro> */ 703 /* FT_IMAGE_TAG */ 704 /* */ 705 /* <Description> */ 706 /* This macro converts four-letter tags to an unsigned long type. */ 707 /* */ 708 /* <Note> */ 709 /* Since many 16-bit compilers don't like 32-bit enumerations, you */ 710 /* should redefine this macro in case of problems to something like */ 711 /* this: */ 712 /* */ 713 /* { */ 714 /* #define FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 ) value */ 715 /* } */ 716 /* */ 717 /* to get a simple enumeration without assigning special numbers. */ 718 /* */ 719#ifndef FT_IMAGE_TAG 720#define FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 ) \ 721 value = ( ( (unsigned long)_x1 << 24 ) | \ 722 ( (unsigned long)_x2 << 16 ) | \ 723 ( (unsigned long)_x3 << 8 ) | \ 724 (unsigned long)_x4 ) 725#endif /* FT_IMAGE_TAG */ 726 727 728 /*************************************************************************/ 729 /* */ 730 /* <Enum> */ 731 /* FT_Glyph_Format */ 732 /* */ 733 /* <Description> */ 734 /* An enumeration type used to describe the format of a given glyph */ 735 /* image. Note that this version of FreeType only supports two image */ 736 /* formats, even though future font drivers will be able to register */ 737 /* their own format. */ 738 /* */ 739 /* <Values> */ 740 /* FT_GLYPH_FORMAT_NONE :: */ 741 /* The value~0 is reserved. */ 742 /* */ 743 /* FT_GLYPH_FORMAT_COMPOSITE :: */ 744 /* The glyph image is a composite of several other images. This */ 745 /* format is _only_ used with @FT_LOAD_NO_RECURSE, and is used to */ 746 /* report compound glyphs (like accented characters). */ 747 /* */ 748 /* FT_GLYPH_FORMAT_BITMAP :: */ 749 /* The glyph image is a bitmap, and can be described as an */ 750 /* @FT_Bitmap. You generally need to access the `bitmap' field of */ 751 /* the @FT_GlyphSlotRec structure to read it. */ 752 /* */ 753 /* FT_GLYPH_FORMAT_OUTLINE :: */ 754 /* The glyph image is a vectorial outline made of line segments */ 755 /* and Bézier arcs; it can be described as an @FT_Outline; you */ 756 /* generally want to access the `outline' field of the */ 757 /* @FT_GlyphSlotRec structure to read it. */ 758 /* */ 759 /* FT_GLYPH_FORMAT_PLOTTER :: */ 760 /* The glyph image is a vectorial path with no inside and outside */ 761 /* contours. Some Type~1 fonts, like those in the Hershey family, */ 762 /* contain glyphs in this format. These are described as */ 763 /* @FT_Outline, but FreeType isn't currently capable of rendering */ 764 /* them correctly. */ 765 /* */ 766 typedef enum FT_Glyph_Format_ 767 { 768 FT_IMAGE_TAG( FT_GLYPH_FORMAT_NONE, 0, 0, 0, 0 ), 769 770 FT_IMAGE_TAG( FT_GLYPH_FORMAT_COMPOSITE, 'c', 'o', 'm', 'p' ), 771 FT_IMAGE_TAG( FT_GLYPH_FORMAT_BITMAP, 'b', 'i', 't', 's' ), 772 FT_IMAGE_TAG( FT_GLYPH_FORMAT_OUTLINE, 'o', 'u', 't', 'l' ), 773 FT_IMAGE_TAG( FT_GLYPH_FORMAT_PLOTTER, 'p', 'l', 'o', 't' ) 774 775 } FT_Glyph_Format; 776 777 778 /*************************************************************************/ 779 /* */ 780 /* <Enum> */ 781 /* ft_glyph_format_xxx */ 782 /* */ 783 /* <Description> */ 784 /* A list of deprecated constants. Use the corresponding */ 785 /* @FT_Glyph_Format values instead. */ 786 /* */ 787 /* <Values> */ 788 /* ft_glyph_format_none :: See @FT_GLYPH_FORMAT_NONE. */ 789 /* ft_glyph_format_composite :: See @FT_GLYPH_FORMAT_COMPOSITE. */ 790 /* ft_glyph_format_bitmap :: See @FT_GLYPH_FORMAT_BITMAP. */ 791 /* ft_glyph_format_outline :: See @FT_GLYPH_FORMAT_OUTLINE. */ 792 /* ft_glyph_format_plotter :: See @FT_GLYPH_FORMAT_PLOTTER. */ 793 /* */ 794#define ft_glyph_format_none FT_GLYPH_FORMAT_NONE 795#define ft_glyph_format_composite FT_GLYPH_FORMAT_COMPOSITE 796#define ft_glyph_format_bitmap FT_GLYPH_FORMAT_BITMAP 797#define ft_glyph_format_outline FT_GLYPH_FORMAT_OUTLINE 798#define ft_glyph_format_plotter FT_GLYPH_FORMAT_PLOTTER 799 800 801 /*************************************************************************/ 802 /*************************************************************************/ 803 /*************************************************************************/ 804 /***** *****/ 805 /***** R A S T E R D …
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