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| 1 /***************************************************************************/ | |
| 2 /* */ | |
| 3 /* ftstroke.h */ | |
| 4 /* */ | |
| 5 /* FreeType path stroker (specification). */ | |
| 6 /* */ | |
| 7 /* Copyright 2002-2006, 2008, 2009, 2011-2012, 2014 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_STROKE_H__ | |
| 20 #define __FT_STROKE_H__ | |
| 21 | |
| 22 #include <ft2build.h> | |
| 23 #include FT_OUTLINE_H | |
| 24 #include FT_GLYPH_H | |
| 25 | |
| 26 | |
| 27 FT_BEGIN_HEADER | |
| 28 | |
| 29 | |
| 30 /************************************************************************ | |
| 31 * | |
| 32 * @section: | |
| 33 * glyph_stroker | |
| 34 * | |
| 35 * @title: | |
| 36 * Glyph Stroker | |
| 37 * | |
| 38 * @abstract: | |
| 39 * Generating bordered and stroked glyphs. | |
| 40 * | |
| 41 * @description: | |
| 42 * This component generates stroked outlines of a given vectorial | |
| 43 * glyph. It also allows you to retrieve the `outside' and/or the | |
| 44 * `inside' borders of the stroke. | |
| 45 * | |
| 46 * This can be useful to generate `bordered' glyph, i.e., glyphs | |
| 47 * displayed with a coloured (and anti-aliased) border around their | |
| 48 * shape. | |
| 49 * | |
| 50 * @order: | |
| 51 * FT_Stroker | |
| 52 * | |
| 53 * FT_Stroker_LineJoin | |
| 54 * FT_Stroker_LineCap | |
| 55 * FT_StrokerBorder | |
| 56 * | |
| 57 * FT_Outline_GetInsideBorder | |
| 58 * FT_Outline_GetOutsideBorder | |
| 59 * | |
| 60 * FT_Glyph_Stroke | |
| 61 * FT_Glyph_StrokeBorder | |
| 62 * | |
| 63 * FT_Stroker_New | |
| 64 * FT_Stroker_Set | |
| 65 * FT_Stroker_Rewind | |
| 66 * FT_Stroker_ParseOutline | |
| 67 * FT_Stroker_Done | |
| 68 * | |
| 69 * FT_Stroker_BeginSubPath | |
| 70 * FT_Stroker_EndSubPath | |
| 71 * | |
| 72 * FT_Stroker_LineTo | |
| 73 * FT_Stroker_ConicTo | |
| 74 * FT_Stroker_CubicTo | |
| 75 * | |
| 76 * FT_Stroker_GetBorderCounts | |
| 77 * FT_Stroker_ExportBorder | |
| 78 * FT_Stroker_GetCounts | |
| 79 * FT_Stroker_Export | |
| 80 * | |
| 81 */ | |
| 82 | |
| 83 | |
| 84 /************************************************************** | |
| 85 * | |
| 86 * @type: | |
| 87 * FT_Stroker | |
| 88 * | |
| 89 * @description: | |
| 90 * Opaque handle to a path stroker object. | |
| 91 */ | |
| 92 typedef struct FT_StrokerRec_* FT_Stroker; | |
| 93 | |
| 94 | |
| 95 /************************************************************** | |
| 96 * | |
| 97 * @enum: | |
| 98 * FT_Stroker_LineJoin | |
| 99 * | |
| 100 * @description: | |
| 101 * These values determine how two joining lines are rendered | |
| 102 * in a stroker. | |
| 103 * | |
| 104 * @values: | |
| 105 * FT_STROKER_LINEJOIN_ROUND :: | |
| 106 * Used to render rounded line joins. Circular arcs are used | |
| 107 * to join two lines smoothly. | |
| 108 * | |
| 109 * FT_STROKER_LINEJOIN_BEVEL :: | |
| 110 * Used to render beveled line joins. The outer corner of | |
| 111 * the joined lines is filled by enclosing the triangular | |
| 112 * region of the corner with a straight line between the | |
| 113 * outer corners of each stroke. | |
| 114 * | |
| 115 * FT_STROKER_LINEJOIN_MITER_FIXED :: | |
| 116 * Used to render mitered line joins, with fixed bevels if the | |
| 117 * miter limit is exceeded. The outer edges of the strokes | |
| 118 * for the two segments are extended until they meet at an | |
| 119 * angle. If the segments meet at too sharp an angle (such | |
| 120 * that the miter would extend from the intersection of the | |
| 121 * segments a distance greater than the product of the miter | |
| 122 * limit value and the border radius), then a bevel join (see | |
| 123 * above) is used instead. This prevents long spikes being | |
| 124 * created. FT_STROKER_LINEJOIN_MITER_FIXED generates a miter | |
| 125 * line join as used in PostScript and PDF. | |
| 126 * | |
| 127 * FT_STROKER_LINEJOIN_MITER_VARIABLE :: | |
| 128 * FT_STROKER_LINEJOIN_MITER :: | |
| 129 * Used to render mitered line joins, with variable bevels if | |
| 130 * the miter limit is exceeded. The intersection of the | |
| 131 * strokes is clipped at a line perpendicular to the bisector | |
| 132 * of the angle between the strokes, at the distance from the | |
| 133 * intersection of the segments equal to the product of the | |
| 134 * miter limit value and the border radius. This prevents | |
| 135 * long spikes being created. | |
| 136 * FT_STROKER_LINEJOIN_MITER_VARIABLE generates a mitered line | |
| 137 * join as used in XPS. FT_STROKER_LINEJOIN_MITER is an alias | |
| 138 * for FT_STROKER_LINEJOIN_MITER_VARIABLE, retained for | |
| 139 * backwards compatibility. | |
| 140 */ | |
| 141 typedef enum FT_Stroker_LineJoin_ | |
| 142 { | |
| 143 FT_STROKER_LINEJOIN_ROUND = 0, | |
| 144 FT_STROKER_LINEJOIN_BEVEL = 1, | |
| 145 FT_STROKER_LINEJOIN_MITER_VARIABLE = 2, | |
| 146 FT_STROKER_LINEJOIN_MITER = FT_STROKER_LINEJOIN_MITER_VARIABLE, | |
| 147 FT_STROKER_LINEJOIN_MITER_FIXED = 3 | |
| 148 | |
| 149 } FT_Stroker_LineJoin; | |
| 150 | |
| 151 | |
| 152 /************************************************************** | |
| 153 * | |
| 154 * @enum: | |
| 155 * FT_Stroker_LineCap | |
| 156 * | |
| 157 * @description: | |
| 158 * These values determine how the end of opened sub-paths are | |
| 159 * rendered in a stroke. | |
| 160 * | |
| 161 * @values: | |
| 162 * FT_STROKER_LINECAP_BUTT :: | |
| 163 * The end of lines is rendered as a full stop on the last | |
| 164 * point itself. | |
| 165 * | |
| 166 * FT_STROKER_LINECAP_ROUND :: | |
| 167 * The end of lines is rendered as a half-circle around the | |
| 168 * last point. | |
| 169 * | |
| 170 * FT_STROKER_LINECAP_SQUARE :: | |
| 171 * The end of lines is rendered as a square around the | |
| 172 * last point. | |
| 173 */ | |
| 174 typedef enum FT_Stroker_LineCap_ | |
| 175 { | |
| 176 FT_STROKER_LINECAP_BUTT = 0, | |
| 177 FT_STROKER_LINECAP_ROUND, | |
| 178 FT_STROKER_LINECAP_SQUARE | |
| 179 | |
| 180 } FT_Stroker_LineCap; | |
| 181 | |
| 182 | |
| 183 /************************************************************** | |
| 184 * | |
| 185 * @enum: | |
| 186 * FT_StrokerBorder | |
| 187 * | |
| 188 * @description: | |
| 189 * These values are used to select a given stroke border | |
| 190 * in @FT_Stroker_GetBorderCounts and @FT_Stroker_ExportBorder. | |
| 191 * | |
| 192 * @values: | |
| 193 * FT_STROKER_BORDER_LEFT :: | |
| 194 * Select the left border, relative to the drawing direction. | |
| 195 * | |
| 196 * FT_STROKER_BORDER_RIGHT :: | |
| 197 * Select the right border, relative to the drawing direction. | |
| 198 * | |
| 199 * @note: | |
| 200 * Applications are generally interested in the `inside' and `outside' | |
| 201 * borders. However, there is no direct mapping between these and the | |
| 202 * `left' and `right' ones, since this really depends on the glyph's | |
| 203 * drawing orientation, which varies between font formats. | |
| 204 * | |
| 205 * You can however use @FT_Outline_GetInsideBorder and | |
| 206 * @FT_Outline_GetOutsideBorder to get these. | |
| 207 */ | |
| 208 typedef enum FT_StrokerBorder_ | |
| 209 { | |
| 210 FT_STROKER_BORDER_LEFT = 0, | |
| 211 FT_STROKER_BORDER_RIGHT | |
| 212 | |
| 213 } FT_StrokerBorder; | |
| 214 | |
| 215 | |
| 216 /************************************************************** | |
| 217 * | |
| 218 * @function: | |
| 219 * FT_Outline_GetInsideBorder | |
| 220 * | |
| 221 * @description: | |
| 222 * Retrieve the @FT_StrokerBorder value corresponding to the | |
| 223 * `inside' borders of a given outline. | |
| 224 * | |
| 225 * @input: | |
| 226 * outline :: | |
| 227 * The source outline handle. | |
| 228 * | |
| 229 * @return: | |
| 230 * The border index. @FT_STROKER_BORDER_RIGHT for empty or invalid | |
| 231 * outlines. | |
| 232 */ | |
| 233 FT_EXPORT( FT_StrokerBorder ) | |
| 234 FT_Outline_GetInsideBorder( FT_Outline* outline ); | |
| 235 | |
| 236 | |
| 237 /************************************************************** | |
| 238 * | |
| 239 * @function: | |
| 240 * FT_Outline_GetOutsideBorder | |
| 241 * | |
| 242 * @description: | |
| 243 * Retrieve the @FT_StrokerBorder value corresponding to the | |
| 244 * `outside' borders of a given outline. | |
| 245 * | |
| 246 * @input: | |
| 247 * outline :: | |
| 248 * The source outline handle. | |
| 249 * | |
| 250 * @return: | |
| 251 * The border index. @FT_STROKER_BORDER_LEFT for empty or invalid | |
| 252 * outlines. | |
| 253 */ | |
| 254 FT_EXPORT( FT_StrokerBorder ) | |
| 255 FT_Outline_GetOutsideBorder( FT_Outline* outline ); | |
| 256 | |
| 257 | |
| 258 /************************************************************** | |
| 259 * | |
| 260 * @function: | |
| 261 * FT_Stroker_New | |
| 262 * | |
| 263 * @description: | |
| 264 * Create a new stroker object. | |
| 265 * | |
| 266 * @input: | |
| 267 * library :: | |
| 268 * FreeType library handle. | |
| 269 * | |
| 270 * @output: | |
| 271 * astroker :: | |
| 272 * A new stroker object handle. NULL in case of error. | |
| 273 * | |
| 274 * @return: | |
| 275 * FreeType error code. 0~means success. | |
| 276 */ | |
| 277 FT_EXPORT( FT_Error ) | |
| 278 FT_Stroker_New( FT_Library library, | |
| 279 FT_Stroker *astroker ); | |
| 280 | |
| 281 | |
| 282 /************************************************************** | |
| 283 * | |
| 284 * @function: | |
| 285 * FT_Stroker_Set | |
| 286 * | |
| 287 * @description: | |
| 288 * Reset a stroker object's attributes. | |
| 289 * | |
| 290 * @input: | |
| 291 * stroker :: | |
| 292 * The target stroker handle. | |
| 293 * | |
| 294 * radius :: | |
| 295 * The border radius. | |
| 296 * | |
| 297 * line_cap :: | |
| 298 * The line cap style. | |
| 299 * | |
| 300 * line_join :: | |
| 301 * The line join style. | |
| 302 * | |
| 303 * miter_limit :: | |
| 304 * The miter limit for the FT_STROKER_LINEJOIN_MITER_FIXED and | |
| 305 * FT_STROKER_LINEJOIN_MITER_VARIABLE line join styles, | |
| 306 * expressed as 16.16 fixed-point value. | |
| 307 * | |
| 308 * @note: | |
| 309 * The radius is expressed in the same units as the outline | |
| 310 * coordinates. | |
| 311 * | |
| 312 * This function calls @FT_Stroker_Rewind automatically. | |
| 313 */ | |
| 314 FT_EXPORT( void ) | |
| 315 FT_Stroker_Set( FT_Stroker stroker, | |
| 316 FT_Fixed radius, | |
| 317 FT_Stroker_LineCap line_cap, | |
| 318 FT_Stroker_LineJoin line_join, | |
| 319 FT_Fixed miter_limit ); | |
| 320 | |
| 321 | |
| 322 /************************************************************** | |
| 323 * | |
| 324 * @function: | |
| 325 * FT_Stroker_Rewind | |
| 326 * | |
| 327 * @description: | |
| 328 * Reset a stroker object without changing its attributes. | |
| 329 * You should call this function before beginning a new | |
| 330 * series of calls to @FT_Stroker_BeginSubPath or | |
| 331 * @FT_Stroker_EndSubPath. | |
| 332 * | |
| 333 * @input: | |
| 334 * stroker :: | |
| 335 * The target stroker handle. | |
| 336 */ | |
| 337 FT_EXPORT( void ) | |
| 338 FT_Stroker_Rewind( FT_Stroker stroker ); | |
| 339 | |
| 340 | |
| 341 /************************************************************** | |
| 342 * | |
| 343 * @function: | |
| 344 * FT_Stroker_ParseOutline | |
| 345 * | |
| 346 * @description: | |
| 347 * A convenience function used to parse a whole outline with | |
| 348 * the stroker. The resulting outline(s) can be retrieved | |
| 349 * later by functions like @FT_Stroker_GetCounts and @FT_Stroker_Export. | |
| 350 * | |
| 351 * @input: | |
| 352 * stroker :: | |
| 353 * The target stroker handle. | |
| 354 * | |
| 355 * outline :: | |
| 356 * The source outline. | |
| 357 * | |
| 358 * opened :: | |
| 359 * A boolean. If~1, the outline is treated as an open path instead | |
| 360 * of a closed one. | |
| 361 * | |
| 362 * @return: | |
| 363 * FreeType error code. 0~means success. | |
| 364 * | |
| 365 * @note: | |
| 366 * If `opened' is~0 (the default), the outline is treated as a closed | |
| 367 * path, and the stroker generates two distinct `border' outlines. | |
| 368 * | |
| 369 * If `opened' is~1, the outline is processed as an open path, and the | |
| 370 * stroker generates a single `stroke' outline. | |
| 371 * | |
| 372 * This function calls @FT_Stroker_Rewind automatically. | |
| 373 */ | |
| 374 FT_EXPORT( FT_Error ) | |
| 375 FT_Stroker_ParseOutline( FT_Stroker stroker, | |
| 376 FT_Outline* outline, | |
| 377 FT_Bool opened ); | |
| 378 | |
| 379 | |
| 380 /************************************************************** | |
| 381 * | |
| 382 * @function: | |
| 383 * FT_Stroker_BeginSubPath | |
| 384 * | |
| 385 * @description: | |
| 386 * Start a new sub-path in the stroker. | |
| 387 * | |
| 388 * @input: | |
| 389 * stroker :: | |
| 390 * The target stroker handle. | |
| 391 * | |
| 392 * to :: | |
| 393 * A pointer to the start vector. | |
| 394 * | |
| 395 * open :: | |
| 396 * A boolean. If~1, the sub-path is treated as an open one. | |
| 397 * | |
| 398 * @return: | |
| 399 * FreeType error code. 0~means success. | |
| 400 * | |
| 401 * @note: | |
| 402 * This function is useful when you need to stroke a path that is | |
| 403 * not stored as an @FT_Outline object. | |
| 404 */ | |
| 405 FT_EXPORT( FT_Error ) | |
| 406 FT_Stroker_BeginSubPath( FT_Stroker stroker, | |
| 407 FT_Vector* to, | |
| 408 FT_Bool open ); | |
| 409 | |
| 410 | |
| 411 /************************************************************** | |
| 412 * | |
| 413 * @function: | |
| 414 * FT_Stroker_EndSubPath | |
| 415 * | |
| 416 * @description: | |
| 417 * Close the current sub-path in the stroker. | |
| 418 * | |
| 419 * @input: | |
| 420 * stroker :: | |
| 421 * The target stroker handle. | |
| 422 * | |
| 423 * @return: | |
| 424 * FreeType error code. 0~means success. | |
| 425 * | |
| 426 * @note: | |
| 427 * You should call this function after @FT_Stroker_BeginSubPath. | |
| 428 * If the subpath was not `opened', this function `draws' a | |
| 429 * single line segment to the start position when needed. | |
| 430 */ | |
| 431 FT_EXPORT( FT_Error ) | |
| 432 FT_Stroker_EndSubPath( FT_Stroker stroker ); | |
| 433 | |
| 434 | |
| 435 /************************************************************** | |
| 436 * | |
| 437 * @function: | |
| 438 * FT_Stroker_LineTo | |
| 439 * | |
| 440 * @description: | |
| 441 * `Draw' a single line segment in the stroker's current sub-path, | |
| 442 * from the last position. | |
| 443 * | |
| 444 * @input: | |
| 445 * stroker :: | |
| 446 * The target stroker handle. | |
| 447 * | |
| 448 * to :: | |
| 449 * A pointer to the destination point. | |
| 450 * | |
| 451 * @return: | |
| 452 * FreeType error code. 0~means success. | |
| 453 * | |
| 454 * @note: | |
| 455 * You should call this function between @FT_Stroker_BeginSubPath and | |
| 456 * @FT_Stroker_EndSubPath. | |
| 457 */ | |
| 458 FT_EXPORT( FT_Error ) | |
| 459 FT_Stroker_LineTo( FT_Stroker stroker, | |
| 460 FT_Vector* to ); | |
| 461 | |
| 462 | |
| 463 /************************************************************** | |
| 464 * | |
| 465 * @function: | |
| 466 * FT_Stroker_ConicTo | |
| 467 * | |
| 468 * @description: | |
| 469 * `Draw' a single quadratic Bézier in the stroker's current sub-path, | |
| 470 * from the last position. | |
| 471 * | |
| 472 * @input: | |
| 473 * stroker :: | |
| 474 * The target stroker handle. | |
| 475 * | |
| 476 * control :: | |
| 477 * A pointer to a Bézier control point. | |
| 478 * | |
| 479 * to :: | |
| 480 * A pointer to the destination point. | |
| 481 * | |
| 482 * @return: | |
| 483 * FreeType error code. 0~means success. | |
| 484 * | |
| 485 * @note: | |
| 486 * You should call this function between @FT_Stroker_BeginSubPath and | |
| 487 * @FT_Stroker_EndSubPath. | |
| 488 */ | |
| 489 FT_EXPORT( FT_Error ) | |
| 490 FT_Stroker_ConicTo( FT_Stroker stroker, | |
| 491 FT_Vector* control, | |
| 492 FT_Vector* to ); | |
| 493 | |
| 494 | |
| 495 /************************************************************** | |
| 496 * | |
| 497 * @function: | |
| 498 * FT_Stroker_CubicTo | |
| 499 * | |
| 500 * @description: | |
| 501 * `Draw' a single cubic Bézier in the stroker's current sub-path, | |
| 502 * from the last position. | |
| 503 * | |
| 504 * @input: | |
| 505 * stroker :: | |
| 506 * The target stroker handle. | |
| 507 * | |
| 508 * control1 :: | |
| 509 * A pointer to the first Bézier control point. | |
| 510 * | |
| 511 * control2 :: | |
| 512 * A pointer to second Bézier control point. | |
| 513 * | |
| 514 * to :: | |
| 515 * A pointer to the destination point. | |
| 516 * | |
| 517 * @return: | |
| 518 * FreeType error code. 0~means success. | |
| 519 * | |
| 520 * @note: | |
| 521 * You should call this function between @FT_Stroker_BeginSubPath and | |
| 522 * @FT_Stroker_EndSubPath. | |
| 523 */ | |
| 524 FT_EXPORT( FT_Error ) | |
| 525 FT_Stroker_CubicTo( FT_Stroker stroker, | |
| 526 FT_Vector* control1, | |
| 527 FT_Vector* control2, | |
| 528 FT_Vector* to ); | |
| 529 | |
| 530 | |
| 531 /************************************************************** | |
| 532 * | |
| 533 * @function: | |
| 534 * FT_Stroker_GetBorderCounts | |
| 535 * | |
| 536 * @description: | |
| 537 * Call this function once you have finished parsing your paths | |
| 538 * with the stroker. It returns the number of points and | |
| 539 * contours necessary to export one of the `border' or `stroke' | |
| 540 * outlines generated by the stroker. | |
| 541 * | |
| 542 * @input: | |
| 543 * stroker :: | |
| 544 * The target stroker handle. | |
| 545 * | |
| 546 * border :: | |
| 547 * The border index. | |
| 548 * | |
| 549 * @output: | |
| 550 * anum_points :: | |
| 551 * The number of points. | |
| 552 * | |
| 553 * anum_contours :: | |
| 554 * The number of contours. | |
| 555 * | |
| 556 * @return: | |
| 557 * FreeType error code. 0~means success. | |
| 558 * | |
| 559 * @note: | |
| 560 * When an outline, or a sub-path, is `closed', the stroker generates | |
| 561 * two independent `border' outlines, named `left' and `right'. | |
| 562 * | |
| 563 * When the outline, or a sub-path, is `opened', the stroker merges | |
| 564 * the `border' outlines with caps. The `left' border receives all | |
| 565 * points, while the `right' border becomes empty. | |
| 566 * | |
| 567 * Use the function @FT_Stroker_GetCounts instead if you want to | |
| 568 * retrieve the counts associated to both borders. | |
| 569 */ | |
| 570 FT_EXPORT( FT_Error ) | |
| 571 FT_Stroker_GetBorderCounts( FT_Stroker stroker, | |
| 572 FT_StrokerBorder border, | |
| 573 FT_UInt *anum_points, | |
| 574 FT_UInt *anum_contours ); | |
| 575 | |
| 576 | |
| 577 /************************************************************** | |
| 578 * | |
| 579 * @function: | |
| 580 * FT_Stroker_ExportBorder | |
| 581 * | |
| 582 * @description: | |
| 583 * Call this function after @FT_Stroker_GetBorderCounts to | |
| 584 * export the corresponding border to your own @FT_Outline | |
| 585 * structure. | |
| 586 * | |
| 587 * Note that this function appends the border points and | |
| 588 * contours to your outline, but does not try to resize its | |
| 589 * arrays. | |
| 590 * | |
| 591 * @input: | |
| 592 * stroker :: | |
| 593 * The target stroker handle. | |
| 594 * | |
| 595 * border :: | |
| 596 * The border index. | |
| 597 * | |
| 598 * outline :: | |
| 599 * The target outline handle. | |
| 600 * | |
| 601 * @note: | |
| 602 * Always call this function after @FT_Stroker_GetBorderCounts to | |
| 603 * get sure that there is enough room in your @FT_Outline object to | |
| 604 * receive all new data. | |
| 605 * | |
| 606 * When an outline, or a sub-path, is `closed', the stroker generates | |
| 607 * two independent `border' outlines, named `left' and `right'. | |
| 608 * | |
| 609 * When the outline, or a sub-path, is `opened', the stroker merges | |
| 610 * the `border' outlines with caps. The `left' border receives all | |
| 611 * points, while the `right' border becomes empty. | |
| 612 * | |
| 613 * Use the function @FT_Stroker_Export instead if you want to | |
| 614 * retrieve all borders at once. | |
| 615 */ | |
| 616 FT_EXPORT( void ) | |
| 617 FT_Stroker_ExportBorder( FT_Stroker stroker, | |
| 618 FT_StrokerBorder border, | |
| 619 FT_Outline* outline ); | |
| 620 | |
| 621 | |
| 622 /************************************************************** | |
| 623 * | |
| 624 * @function: | |
| 625 * FT_Stroker_GetCounts | |
| 626 * | |
| 627 * @description: | |
| 628 * Call this function once you have finished parsing your paths | |
| 629 * with the stroker. It returns the number of points and | |
| 630 * contours necessary to export all points/borders from the stroked | |
| 631 * outline/path. | |
| 632 * | |
| 633 * @input: | |
| 634 * stroker :: | |
| 635 * The target stroker handle. | |
| 636 * | |
| 637 * @output: | |
| 638 * anum_points :: | |
| 639 * The number of points. | |
| 640 * | |
| 641 * anum_contours :: | |
| 642 * The number of contours. | |
| 643 * | |
| 644 * @return: | |
| 645 * FreeType error code. 0~means success. | |
| 646 */ | |
| 647 FT_EXPORT( FT_Error ) | |
| 648 FT_Stroker_GetCounts( FT_Stroker stroker, | |
| 649 FT_UInt *anum_points, | |
| 650 FT_UInt *anum_contours ); | |
| 651 | |
| 652 | |
| 653 /************************************************************** | |
| 654 * | |
| 655 * @function: | |
| 656 * FT_Stroker_Export | |
| 657 * | |
| 658 * @description: | |
| 659 * Call this function after @FT_Stroker_GetBorderCounts to | |
| 660 * export all borders to your own @FT_Outline structure. | |
| 661 * | |
| 662 * Note that this function appends the border points and | |
| 663 * contours to your outline, but does not try to resize its | |
| 664 * arrays. | |
| 665 * | |
| 666 * @input: | |
| 667 * stroker :: | |
| 668 * The target stroker handle. | |
| 669 * | |
| 670 * outline :: | |
| 671 * The target outline handle. | |
| 672 */ | |
| 673 FT_EXPORT( void ) | |
| 674 FT_Stroker_Export( FT_Stroker stroker, | |
| 675 FT_Outline* outline ); | |
| 676 | |
| 677 | |
| 678 /************************************************************** | |
| 679 * | |
| 680 * @function: | |
| 681 * FT_Stroker_Done | |
| 682 * | |
| 683 * @description: | |
| 684 * Destroy a stroker object. | |
| 685 * | |
| 686 * @input: | |
| 687 * stroker :: | |
| 688 * A stroker handle. Can be NULL. | |
| 689 */ | |
| 690 FT_EXPORT( void ) | |
| 691 FT_Stroker_Done( FT_Stroker stroker ); | |
| 692 | |
| 693 | |
| 694 /************************************************************** | |
| 695 * | |
| 696 * @function: | |
| 697 * FT_Glyph_Stroke | |
| 698 * | |
| 699 * @description: | |
| 700 * Stroke a given outline glyph object with a given stroker. | |
| 701 * | |
| 702 * @inout: | |
| 703 * pglyph :: | |
| 704 * Source glyph handle on input, new glyph handle on output. | |
| 705 * | |
| 706 * @input: | |
| 707 * stroker :: | |
| 708 * A stroker handle. | |
| 709 * | |
| 710 * destroy :: | |
| 711 * A Boolean. If~1, the source glyph object is destroyed | |
| 712 * on success. | |
| 713 * | |
| 714 * @return: | |
| 715 * FreeType error code. 0~means success. | |
| 716 * | |
| 717 * @note: | |
| 718 * The source glyph is untouched in case of error. | |
| 719 * | |
| 720 * Adding stroke may yield a significantly wider and taller glyph | |
| 721 * depending on how large of a radius was used to stroke the glyph. You | |
| 722 * may need to manually adjust horizontal and vertical advance amounts | |
| 723 * to account for this added size. | |
| 724 */ | |
| 725 FT_EXPORT( FT_Error ) | |
| 726 FT_Glyph_Stroke( FT_Glyph *pglyph, | |
| 727 FT_Stroker stroker, | |
| 728 FT_Bool destroy ); | |
| 729 | |
| 730 | |
| 731 /************************************************************** | |
| 732 * | |
| 733 * @function: | |
| 734 * FT_Glyph_StrokeBorder | |
| 735 * | |
| 736 * @description: | |
| 737 * Stroke a given outline glyph object with a given stroker, but | |
| 738 * only return either its inside or outside border. | |
| 739 * | |
| 740 * @inout: | |
| 741 * pglyph :: | |
| 742 * Source glyph handle on input, new glyph handle on output. | |
| 743 * | |
| 744 * @input: | |
| 745 * stroker :: | |
| 746 * A stroker handle. | |
| 747 * | |
| 748 * inside :: | |
| 749 * A Boolean. If~1, return the inside border, otherwise | |
| 750 * the outside border. | |
| 751 * | |
| 752 * destroy :: | |
| 753 * A Boolean. If~1, the source glyph object is destroyed | |
| 754 * on success. | |
| 755 * | |
| 756 * @return: | |
| 757 * FreeType error code. 0~means success. | |
| 758 * | |
| 759 * @note: | |
| 760 * The source glyph is untouched in case of error. | |
| 761 * | |
| 762 * Adding stroke may yield a significantly wider and taller glyph | |
| 763 * depending on how large of a radius was used to stroke the glyph. You | |
| 764 * may need to manually adjust horizontal and vertical advance amounts | |
| 765 * to account for this added size. | |
| 766 */ | |
| 767 FT_EXPORT( FT_Error ) | |
| 768 FT_Glyph_StrokeBorder( FT_Glyph *pglyph, | |
| 769 FT_Stroker stroker, | |
| 770 FT_Bool inside, | |
| 771 FT_Bool destroy ); | |
| 772 | |
| 773 /* */ | |
| 774 | |
| 775 FT_END_HEADER | |
| 776 | |
| 777 #endif /* __FT_STROKE_H__ */ | |
| 778 | |
| 779 | |
| 780 /* END */ | |
| 781 | |
| 782 | |
| 783 /* Local Variables: */ | |
| 784 /* coding: utf-8 */ | |
| 785 /* End: */ | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1413673003:
Update bundled freetype to 2.6.1 (Closed)
Base URL: https://pdfium.googlesource.com/pdfium.git@master