1 /* 2 * Copyright © 2009 Red Hat, Inc. 3 * Copyright © 2009 Keith Stribley 4 * Copyright © 2015 Google, Inc. 5 * 6 * This is part of HarfBuzz, a text shaping library. 7 * 8 * Permission is hereby granted, without written agreement and without 9 * license or royalty fees, to use, copy, modify, and distribute this 10 * software and its documentation for any purpose, provided that the 11 * above copyright notice and the following two paragraphs appear in 12 * all copies of this software. 13 * 14 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR 15 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 16 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN 17 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 18 * DAMAGE. 19 * 20 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, 21 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 22 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 23 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO 24 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 25 * 26 * Red Hat Author(s): Behdad Esfahbod 27 * Google Author(s): Behdad Esfahbod 28 */ 29 30 #include "hb.hh" 31 32 #include "hb-ft.h" 33 34 #include "hb-font.hh" 35 #include "hb-machinery.hh" 36 #include "hb-cache.hh" 37 38 #include FT_ADVANCES_H 39 #include FT_MULTIPLE_MASTERS_H 40 #include FT_TRUETYPE_TABLES_H 41 42 43 /** 44 * SECTION:hb-ft 45 * @title: hb-ft 46 * @short_description: FreeType integration 47 * @include: hb-ft.h 48 * 49 * Functions for using HarfBuzz with the FreeType library to provide face and 50 * font data. 51 **/ 52 53 54 /* TODO: 55 * 56 * In general, this file does a fine job of what it's supposed to do. 57 * There are, however, things that need more work: 58 * 59 * - FreeType works in 26.6 mode. Clients can decide to use that mode, and everything 60 * would work fine. However, we also abuse this API for performing in font-space, 61 * but don't pass the correct flags to FreeType. We just abuse the no-hinting mode 62 * for that, such that no rounding etc happens. As such, we don't set ppem, and 63 * pass NO_HINTING as load_flags. Would be much better to use NO_SCALE, and scale 64 * ourselves. 65 * 66 * - We don't handle / allow for emboldening / obliqueing. 67 * 68 * - In the future, we should add constructors to create fonts in font space? 69 */ 70 71 72 struct hb_ft_font_t 73 { 74 mutable hb_mutex_t lock; 75 FT_Face ft_face; 76 int load_flags; 77 bool symbol; /* Whether selected cmap is symbol cmap. */ 78 bool unref; /* Whether to destroy ft_face when done. */ 79 80 mutable hb_atomic_int_t cached_x_scale; 81 mutable hb_advance_cache_t advance_cache; 82 }; 83 84 static hb_ft_font_t * 85 _hb_ft_font_create (FT_Face ft_face, bool symbol, bool unref) 86 { 87 hb_ft_font_t *ft_font = (hb_ft_font_t *) calloc (1, sizeof (hb_ft_font_t)); 88 89 if (unlikely (!ft_font)) 90 return nullptr; 91 92 ft_font->lock.init (); 93 ft_font->ft_face = ft_face; 94 ft_font->symbol = symbol; 95 ft_font->unref = unref; 96 97 ft_font->load_flags = FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING; 98 99 ft_font->cached_x_scale.set (0); 100 ft_font->advance_cache.init (); 101 102 return ft_font; 103 } 104 105 static void 106 _hb_ft_face_destroy (void *data) 107 { 108 FT_Done_Face ((FT_Face) data); 109 } 110 111 static void 112 _hb_ft_font_destroy (void *data) 113 { 114 hb_ft_font_t *ft_font = (hb_ft_font_t *) data; 115 116 ft_font->advance_cache.fini (); 117 118 if (ft_font->unref) 119 _hb_ft_face_destroy (ft_font->ft_face); 120 121 ft_font->lock.fini (); 122 123 free (ft_font); 124 } 125 126 /** 127 * hb_ft_font_set_load_flags: 128 * @font: 129 * @load_flags: 130 * 131 * 132 * 133 * Since: 1.0.5 134 **/ 135 void 136 hb_ft_font_set_load_flags (hb_font_t *font, int load_flags) 137 { 138 if (hb_object_is_immutable (font)) 139 return; 140 141 if (font->destroy != (hb_destroy_func_t) _hb_ft_font_destroy) 142 return; 143 144 hb_ft_font_t *ft_font = (hb_ft_font_t *) font->user_data; 145 146 ft_font->load_flags = load_flags; 147 } 148 149 /** 150 * hb_ft_font_get_load_flags: 151 * @font: 152 * 153 * 154 * 155 * Return value: 156 * Since: 1.0.5 157 **/ 158 int 159 hb_ft_font_get_load_flags (hb_font_t *font) 160 { 161 if (font->destroy != (hb_destroy_func_t) _hb_ft_font_destroy) 162 return 0; 163 164 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font->user_data; 165 166 return ft_font->load_flags; 167 } 168 169 FT_Face 170 hb_ft_font_get_face (hb_font_t *font) 171 { 172 if (font->destroy != (hb_destroy_func_t) _hb_ft_font_destroy) 173 return nullptr; 174 175 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font->user_data; 176 177 return ft_font->ft_face; 178 } 179 180 181 182 static hb_bool_t 183 hb_ft_get_nominal_glyph (hb_font_t *font HB_UNUSED, 184 void *font_data, 185 hb_codepoint_t unicode, 186 hb_codepoint_t *glyph, 187 void *user_data HB_UNUSED) 188 { 189 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; 190 hb_lock_t lock (ft_font->lock); 191 unsigned int g = FT_Get_Char_Index (ft_font->ft_face, unicode); 192 193 if (unlikely (!g)) 194 { 195 if (unlikely (ft_font->symbol) && unicode <= 0x00FFu) 196 { 197 /* For symbol-encoded OpenType fonts, we duplicate the 198 * U+F000..F0FF range at U+0000..U+00FF. That's what 199 * Windows seems to do, and that's hinted about at: 200 * https://docs.microsoft.com/en-us/typography/opentype/spec/recom 201 * under "Non-Standard (Symbol) Fonts". */ 202 g = FT_Get_Char_Index (ft_font->ft_face, 0xF000u + unicode); 203 if (!g) 204 return false; 205 } 206 else 207 return false; 208 } 209 210 *glyph = g; 211 return true; 212 } 213 214 static unsigned int 215 hb_ft_get_nominal_glyphs (hb_font_t *font HB_UNUSED, 216 void *font_data, 217 unsigned int count, 218 const hb_codepoint_t *first_unicode, 219 unsigned int unicode_stride, 220 hb_codepoint_t *first_glyph, 221 unsigned int glyph_stride, 222 void *user_data HB_UNUSED) 223 { 224 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; 225 hb_lock_t lock (ft_font->lock); 226 unsigned int done; 227 for (done = 0; 228 done < count && (*first_glyph = FT_Get_Char_Index (ft_font->ft_face, *first_unicode)); 229 done++) 230 { 231 first_unicode = &StructAtOffsetUnaligned<hb_codepoint_t> (first_unicode, unicode_stride); 232 first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride); 233 } 234 /* We don't need to do ft_font->symbol dance here, since HB calls the singular 235 * nominal_glyph() for what we don't handle here. */ 236 return done; 237 } 238 239 240 static hb_bool_t 241 hb_ft_get_variation_glyph (hb_font_t *font HB_UNUSED, 242 void *font_data, 243 hb_codepoint_t unicode, 244 hb_codepoint_t variation_selector, 245 hb_codepoint_t *glyph, 246 void *user_data HB_UNUSED) 247 { 248 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; 249 hb_lock_t lock (ft_font->lock); 250 unsigned int g = FT_Face_GetCharVariantIndex (ft_font->ft_face, unicode, variation_selector); 251 252 if (unlikely (!g)) 253 return false; 254 255 *glyph = g; 256 return true; 257 } 258 259 static void 260 hb_ft_get_glyph_h_advances (hb_font_t* font, void* font_data, 261 unsigned count, 262 const hb_codepoint_t *first_glyph, 263 unsigned glyph_stride, 264 hb_position_t *first_advance, 265 unsigned advance_stride, 266 void *user_data HB_UNUSED) 267 { 268 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; 269 hb_lock_t lock (ft_font->lock); 270 FT_Face ft_face = ft_font->ft_face; 271 int load_flags = ft_font->load_flags; 272 int mult = font->x_scale < 0 ? -1 : +1; 273 274 if (font->x_scale != ft_font->cached_x_scale.get ()) 275 { 276 ft_font->advance_cache.clear (); 277 ft_font->cached_x_scale.set (font->x_scale); 278 } 279 280 for (unsigned int i = 0; i < count; i++) 281 { 282 FT_Fixed v = 0; 283 hb_codepoint_t glyph = *first_glyph; 284 285 unsigned int cv; 286 if (ft_font->advance_cache.get (glyph, &cv)) 287 v = cv; 288 else 289 { 290 FT_Get_Advance (ft_face, glyph, load_flags, &v); 291 ft_font->advance_cache.set (glyph, v); 292 } 293 294 *first_advance = (v * mult + (1<<9)) >> 10; 295 first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride); 296 first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride); 297 } 298 } 299 300 static hb_position_t 301 hb_ft_get_glyph_v_advance (hb_font_t *font, 302 void *font_data, 303 hb_codepoint_t glyph, 304 void *user_data HB_UNUSED) 305 { 306 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; 307 hb_lock_t lock (ft_font->lock); 308 FT_Fixed v; 309 310 if (unlikely (FT_Get_Advance (ft_font->ft_face, glyph, ft_font->load_flags | FT_LOAD_VERTICAL_LAYOUT, &v))) 311 return 0; 312 313 if (font->y_scale < 0) 314 v = -v; 315 316 /* Note: FreeType's vertical metrics grows downward while other FreeType coordinates 317 * have a Y growing upward. Hence the extra negation. */ 318 return (-v + (1<<9)) >> 10; 319 } 320 321 static hb_bool_t 322 hb_ft_get_glyph_v_origin (hb_font_t *font, 323 void *font_data, 324 hb_codepoint_t glyph, 325 hb_position_t *x, 326 hb_position_t *y, 327 void *user_data HB_UNUSED) 328 { 329 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; 330 hb_lock_t lock (ft_font->lock); 331 FT_Face ft_face = ft_font->ft_face; 332 333 if (unlikely (FT_Load_Glyph (ft_face, glyph, ft_font->load_flags))) 334 return false; 335 336 /* Note: FreeType's vertical metrics grows downward while other FreeType coordinates 337 * have a Y growing upward. Hence the extra negation. */ 338 *x = ft_face->glyph->metrics.horiBearingX - ft_face->glyph->metrics.vertBearingX; 339 *y = ft_face->glyph->metrics.horiBearingY - (-ft_face->glyph->metrics.vertBearingY); 340 341 if (font->x_scale < 0) 342 *x = -*x; 343 if (font->y_scale < 0) 344 *y = -*y; 345 346 return true; 347 } 348 349 static hb_bool_t 350 hb_ft_get_glyph_extents (hb_font_t *font, 351 void *font_data, 352 hb_codepoint_t glyph, 353 hb_glyph_extents_t *extents, 354 void *user_data HB_UNUSED) 355 { 356 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; 357 hb_lock_t lock (ft_font->lock); 358 FT_Face ft_face = ft_font->ft_face; 359 360 if (unlikely (FT_Load_Glyph (ft_face, glyph, ft_font->load_flags))) 361 return false; 362 363 extents->x_bearing = ft_face->glyph->metrics.horiBearingX; 364 extents->y_bearing = ft_face->glyph->metrics.horiBearingY; 365 extents->width = ft_face->glyph->metrics.width; 366 extents->height = -ft_face->glyph->metrics.height; 367 if (font->x_scale < 0) 368 { 369 extents->x_bearing = -extents->x_bearing; 370 extents->width = -extents->width; 371 } 372 if (font->y_scale < 0) 373 { 374 extents->y_bearing = -extents->y_bearing; 375 extents->height = -extents->height; 376 } 377 return true; 378 } 379 380 static hb_bool_t 381 hb_ft_get_glyph_contour_point (hb_font_t *font HB_UNUSED, 382 void *font_data, 383 hb_codepoint_t glyph, 384 unsigned int point_index, 385 hb_position_t *x, 386 hb_position_t *y, 387 void *user_data HB_UNUSED) 388 { 389 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; 390 hb_lock_t lock (ft_font->lock); 391 FT_Face ft_face = ft_font->ft_face; 392 393 if (unlikely (FT_Load_Glyph (ft_face, glyph, ft_font->load_flags))) 394 return false; 395 396 if (unlikely (ft_face->glyph->format != FT_GLYPH_FORMAT_OUTLINE)) 397 return false; 398 399 if (unlikely (point_index >= (unsigned int) ft_face->glyph->outline.n_points)) 400 return false; 401 402 *x = ft_face->glyph->outline.points[point_index].x; 403 *y = ft_face->glyph->outline.points[point_index].y; 404 405 return true; 406 } 407 408 static hb_bool_t 409 hb_ft_get_glyph_name (hb_font_t *font HB_UNUSED, 410 void *font_data, 411 hb_codepoint_t glyph, 412 char *name, unsigned int size, 413 void *user_data HB_UNUSED) 414 { 415 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; 416 hb_lock_t lock (ft_font->lock); 417 FT_Face ft_face = ft_font->ft_face; 418 419 hb_bool_t ret = !FT_Get_Glyph_Name (ft_face, glyph, name, size); 420 if (ret && (size && !*name)) 421 ret = false; 422 423 return ret; 424 } 425 426 static hb_bool_t 427 hb_ft_get_glyph_from_name (hb_font_t *font HB_UNUSED, 428 void *font_data, 429 const char *name, int len, /* -1 means nul-terminated */ 430 hb_codepoint_t *glyph, 431 void *user_data HB_UNUSED) 432 { 433 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; 434 hb_lock_t lock (ft_font->lock); 435 FT_Face ft_face = ft_font->ft_face; 436 437 if (len < 0) 438 *glyph = FT_Get_Name_Index (ft_face, (FT_String *) name); 439 else { 440 /* Make a nul-terminated version. */ 441 char buf[128]; 442 len = MIN (len, (int) sizeof (buf) - 1); 443 strncpy (buf, name, len); 444 buf[len] = '\0'; 445 *glyph = FT_Get_Name_Index (ft_face, buf); 446 } 447 448 if (*glyph == 0) 449 { 450 /* Check whether the given name was actually the name of glyph 0. */ 451 char buf[128]; 452 if (!FT_Get_Glyph_Name(ft_face, 0, buf, sizeof (buf)) && 453 len < 0 ? !strcmp (buf, name) : !strncmp (buf, name, len)) 454 return true; 455 } 456 457 return *glyph != 0; 458 } 459 460 static hb_bool_t 461 hb_ft_get_font_h_extents (hb_font_t *font HB_UNUSED, 462 void *font_data, 463 hb_font_extents_t *metrics, 464 void *user_data HB_UNUSED) 465 { 466 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; 467 hb_lock_t lock (ft_font->lock); 468 FT_Face ft_face = ft_font->ft_face; 469 metrics->ascender = FT_MulFix(ft_face->ascender, ft_face->size->metrics.y_scale); 470 metrics->descender = FT_MulFix(ft_face->descender, ft_face->size->metrics.y_scale); 471 metrics->line_gap = FT_MulFix( ft_face->height, ft_face->size->metrics.y_scale ) - (metrics->ascender - metrics->descender); 472 if (font->y_scale < 0) 473 { 474 metrics->ascender = -metrics->ascender; 475 metrics->descender = -metrics->descender; 476 metrics->line_gap = -metrics->line_gap; 477 } 478 return true; 479 } 480 481 #if HB_USE_ATEXIT 482 static void free_static_ft_funcs (); 483 #endif 484 485 static struct hb_ft_font_funcs_lazy_loader_t : hb_font_funcs_lazy_loader_t<hb_ft_font_funcs_lazy_loader_t> 486 { 487 static hb_font_funcs_t *create () 488 { 489 hb_font_funcs_t *funcs = hb_font_funcs_create (); 490 491 hb_font_funcs_set_font_h_extents_func (funcs, hb_ft_get_font_h_extents, nullptr, nullptr); 492 //hb_font_funcs_set_font_v_extents_func (funcs, hb_ft_get_font_v_extents, nullptr, nullptr); 493 hb_font_funcs_set_nominal_glyph_func (funcs, hb_ft_get_nominal_glyph, nullptr, nullptr); 494 hb_font_funcs_set_nominal_glyphs_func (funcs, hb_ft_get_nominal_glyphs, nullptr, nullptr); 495 hb_font_funcs_set_variation_glyph_func (funcs, hb_ft_get_variation_glyph, nullptr, nullptr); 496 hb_font_funcs_set_glyph_h_advances_func (funcs, hb_ft_get_glyph_h_advances, nullptr, nullptr); 497 hb_font_funcs_set_glyph_v_advance_func (funcs, hb_ft_get_glyph_v_advance, nullptr, nullptr); 498 //hb_font_funcs_set_glyph_h_origin_func (funcs, hb_ft_get_glyph_h_origin, nullptr, nullptr); 499 hb_font_funcs_set_glyph_v_origin_func (funcs, hb_ft_get_glyph_v_origin, nullptr, nullptr); 500 hb_font_funcs_set_glyph_extents_func (funcs, hb_ft_get_glyph_extents, nullptr, nullptr); 501 hb_font_funcs_set_glyph_contour_point_func (funcs, hb_ft_get_glyph_contour_point, nullptr, nullptr); 502 hb_font_funcs_set_glyph_name_func (funcs, hb_ft_get_glyph_name, nullptr, nullptr); 503 hb_font_funcs_set_glyph_from_name_func (funcs, hb_ft_get_glyph_from_name, nullptr, nullptr); 504 505 hb_font_funcs_make_immutable (funcs); 506 507 #if HB_USE_ATEXIT 508 atexit (free_static_ft_funcs); 509 #endif 510 511 return funcs; 512 } 513 } static_ft_funcs; 514 515 #if HB_USE_ATEXIT 516 static 517 void free_static_ft_funcs () 518 { 519 static_ft_funcs.free_instance (); 520 } 521 #endif 522 523 static hb_font_funcs_t * 524 _hb_ft_get_font_funcs () 525 { 526 return static_ft_funcs.get_unconst (); 527 } 528 529 static void 530 _hb_ft_font_set_funcs (hb_font_t *font, FT_Face ft_face, bool unref) 531 { 532 bool symbol = ft_face->charmap && ft_face->charmap->encoding == FT_ENCODING_MS_SYMBOL; 533 534 hb_font_set_funcs (font, 535 _hb_ft_get_font_funcs (), 536 _hb_ft_font_create (ft_face, symbol, unref), 537 _hb_ft_font_destroy); 538 } 539 540 541 static hb_blob_t * 542 reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data) 543 { 544 FT_Face ft_face = (FT_Face) user_data; 545 FT_Byte *buffer; 546 FT_ULong length = 0; 547 FT_Error error; 548 549 /* Note: FreeType like HarfBuzz uses the NONE tag for fetching the entire blob */ 550 551 error = FT_Load_Sfnt_Table (ft_face, tag, 0, nullptr, &length); 552 if (error) 553 return nullptr; 554 555 buffer = (FT_Byte *) malloc (length); 556 if (!buffer) 557 return nullptr; 558 559 error = FT_Load_Sfnt_Table (ft_face, tag, 0, buffer, &length); 560 if (error) 561 { 562 free (buffer); 563 return nullptr; 564 } 565 566 return hb_blob_create ((const char *) buffer, length, 567 HB_MEMORY_MODE_WRITABLE, 568 buffer, free); 569 } 570 571 /** 572 * hb_ft_face_create: 573 * @ft_face: (destroy destroy) (scope notified): 574 * @destroy: 575 * 576 * 577 * 578 * Return value: (transfer full): 579 * Since: 0.9.2 580 **/ 581 hb_face_t * 582 hb_ft_face_create (FT_Face ft_face, 583 hb_destroy_func_t destroy) 584 { 585 hb_face_t *face; 586 587 if (!ft_face->stream->read) { 588 hb_blob_t *blob; 589 590 blob = hb_blob_create ((const char *) ft_face->stream->base, 591 (unsigned int) ft_face->stream->size, 592 HB_MEMORY_MODE_READONLY, 593 ft_face, destroy); 594 face = hb_face_create (blob, ft_face->face_index); 595 hb_blob_destroy (blob); 596 } else { 597 face = hb_face_create_for_tables (reference_table, ft_face, destroy); 598 } 599 600 hb_face_set_index (face, ft_face->face_index); 601 hb_face_set_upem (face, ft_face->units_per_EM); 602 603 return face; 604 } 605 606 /** 607 * hb_ft_face_create_referenced: 608 * @ft_face: 609 * 610 * 611 * 612 * Return value: (transfer full): 613 * Since: 0.9.38 614 **/ 615 hb_face_t * 616 hb_ft_face_create_referenced (FT_Face ft_face) 617 { 618 FT_Reference_Face (ft_face); 619 return hb_ft_face_create (ft_face, _hb_ft_face_destroy); 620 } 621 622 static void 623 hb_ft_face_finalize (FT_Face ft_face) 624 { 625 hb_face_destroy ((hb_face_t *) ft_face->generic.data); 626 } 627 628 /** 629 * hb_ft_face_create_cached: 630 * @ft_face: 631 * 632 * 633 * 634 * Return value: (transfer full): 635 * Since: 0.9.2 636 **/ 637 hb_face_t * 638 hb_ft_face_create_cached (FT_Face ft_face) 639 { 640 if (unlikely (!ft_face->generic.data || ft_face->generic.finalizer != (FT_Generic_Finalizer) hb_ft_face_finalize)) 641 { 642 if (ft_face->generic.finalizer) 643 ft_face->generic.finalizer (ft_face); 644 645 ft_face->generic.data = hb_ft_face_create (ft_face, nullptr); 646 ft_face->generic.finalizer = (FT_Generic_Finalizer) hb_ft_face_finalize; 647 } 648 649 return hb_face_reference ((hb_face_t *) ft_face->generic.data); 650 } 651 652 653 /** 654 * hb_ft_font_create: 655 * @ft_face: (destroy destroy) (scope notified): 656 * @destroy: 657 * 658 * 659 * 660 * Return value: (transfer full): 661 * Since: 0.9.2 662 **/ 663 hb_font_t * 664 hb_ft_font_create (FT_Face ft_face, 665 hb_destroy_func_t destroy) 666 { 667 hb_font_t *font; 668 hb_face_t *face; 669 670 face = hb_ft_face_create (ft_face, destroy); 671 font = hb_font_create (face); 672 hb_face_destroy (face); 673 _hb_ft_font_set_funcs (font, ft_face, false); 674 hb_ft_font_changed (font); 675 return font; 676 } 677 678 void 679 hb_ft_font_changed (hb_font_t *font) 680 { 681 if (font->destroy != (hb_destroy_func_t) _hb_ft_font_destroy) 682 return; 683 684 hb_ft_font_t *ft_font = (hb_ft_font_t *) font->user_data; 685 FT_Face ft_face = ft_font->ft_face; 686 687 hb_font_set_scale (font, 688 (int) (((uint64_t) ft_face->size->metrics.x_scale * (uint64_t) ft_face->units_per_EM + (1u<<15)) >> 16), 689 (int) (((uint64_t) ft_face->size->metrics.y_scale * (uint64_t) ft_face->units_per_EM + (1u<<15)) >> 16)); 690 #if 0 /* hb-ft works in no-hinting model */ 691 hb_font_set_ppem (font, 692 ft_face->size->metrics.x_ppem, 693 ft_face->size->metrics.y_ppem); 694 #endif 695 696 #ifdef HAVE_FT_GET_VAR_BLEND_COORDINATES 697 FT_MM_Var *mm_var = nullptr; 698 if (!FT_Get_MM_Var (ft_face, &mm_var)) 699 { 700 FT_Fixed *ft_coords = (FT_Fixed *) calloc (mm_var->num_axis, sizeof (FT_Fixed)); 701 int *coords = (int *) calloc (mm_var->num_axis, sizeof (int)); 702 if (coords && ft_coords) 703 { 704 if (!FT_Get_Var_Blend_Coordinates (ft_face, mm_var->num_axis, ft_coords)) 705 { 706 bool nonzero = false; 707 708 for (unsigned int i = 0; i < mm_var->num_axis; ++i) 709 { 710 coords[i] = ft_coords[i] >>= 2; 711 nonzero = nonzero || coords[i]; 712 } 713 714 if (nonzero) 715 hb_font_set_var_coords_normalized (font, coords, mm_var->num_axis); 716 else 717 hb_font_set_var_coords_normalized (font, nullptr, 0); 718 } 719 } 720 free (coords); 721 free (ft_coords); 722 #ifdef HAVE_FT_DONE_MM_VAR 723 FT_Done_MM_Var (ft_face->glyph->library, mm_var); 724 #else 725 free (mm_var); 726 #endif 727 } 728 #endif 729 } 730 731 /** 732 * hb_ft_font_create_referenced: 733 * @ft_face: 734 * 735 * 736 * 737 * Return value: (transfer full): 738 * Since: 0.9.38 739 **/ 740 hb_font_t * 741 hb_ft_font_create_referenced (FT_Face ft_face) 742 { 743 FT_Reference_Face (ft_face); 744 return hb_ft_font_create (ft_face, _hb_ft_face_destroy); 745 } 746 747 #if HB_USE_ATEXIT 748 static void free_static_ft_library (); 749 #endif 750 751 static struct hb_ft_library_lazy_loader_t : hb_lazy_loader_t<hb_remove_pointer (FT_Library), 752 hb_ft_library_lazy_loader_t> 753 { 754 static FT_Library create () 755 { 756 FT_Library l; 757 if (FT_Init_FreeType (&l)) 758 return nullptr; 759 760 #if HB_USE_ATEXIT 761 atexit (free_static_ft_library); 762 #endif 763 764 return l; 765 } 766 static void destroy (FT_Library l) 767 { 768 FT_Done_FreeType (l); 769 } 770 static FT_Library get_null () 771 { 772 return nullptr; 773 } 774 } static_ft_library; 775 776 #if HB_USE_ATEXIT 777 static 778 void free_static_ft_library () 779 { 780 static_ft_library.free_instance (); 781 } 782 #endif 783 784 static FT_Library 785 get_ft_library () 786 { 787 return static_ft_library.get_unconst (); 788 } 789 790 static void 791 _release_blob (FT_Face ft_face) 792 { 793 hb_blob_destroy ((hb_blob_t *) ft_face->generic.data); 794 } 795 796 void 797 hb_ft_font_set_funcs (hb_font_t *font) 798 { 799 hb_blob_t *blob = hb_face_reference_blob (font->face); 800 unsigned int blob_length; 801 const char *blob_data = hb_blob_get_data (blob, &blob_length); 802 if (unlikely (!blob_length)) 803 DEBUG_MSG (FT, font, "Font face has empty blob"); 804 805 FT_Face ft_face = nullptr; 806 FT_Error err = FT_New_Memory_Face (get_ft_library (), 807 (const FT_Byte *) blob_data, 808 blob_length, 809 hb_face_get_index (font->face), 810 &ft_face); 811 812 if (unlikely (err)) { 813 hb_blob_destroy (blob); 814 DEBUG_MSG (FT, font, "Font face FT_New_Memory_Face() failed"); 815 return; 816 } 817 818 if (FT_Select_Charmap (ft_face, FT_ENCODING_UNICODE)) 819 FT_Select_Charmap (ft_face, FT_ENCODING_MS_SYMBOL); 820 821 FT_Set_Char_Size (ft_face, 822 abs (font->x_scale), abs (font->y_scale), 823 0, 0); 824 #if 0 825 font->x_ppem * 72 * 64 / font->x_scale, 826 font->y_ppem * 72 * 64 / font->y_scale); 827 #endif 828 if (font->x_scale < 0 || font->y_scale < 0) 829 { 830 FT_Matrix matrix = { font->x_scale < 0 ? -1 : +1, 0, 831 0, font->y_scale < 0 ? -1 : +1}; 832 FT_Set_Transform (ft_face, &matrix, nullptr); 833 } 834 835 #ifdef HAVE_FT_SET_VAR_BLEND_COORDINATES 836 unsigned int num_coords; 837 const int *coords = hb_font_get_var_coords_normalized (font, &num_coords); 838 if (num_coords) 839 { 840 FT_Fixed *ft_coords = (FT_Fixed *) calloc (num_coords, sizeof (FT_Fixed)); 841 if (ft_coords) 842 { 843 for (unsigned int i = 0; i < num_coords; i++) 844 ft_coords[i] = coords[i] << 2; 845 FT_Set_Var_Blend_Coordinates (ft_face, num_coords, ft_coords); 846 free (ft_coords); 847 } 848 } 849 #endif 850 851 ft_face->generic.data = blob; 852 ft_face->generic.finalizer = (FT_Generic_Finalizer) _release_blob; 853 854 _hb_ft_font_set_funcs (font, ft_face, true); 855 hb_ft_font_set_load_flags (font, FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING); 856 }