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-private.hh" 31 #include "hb-debug.hh" 32 33 #include "hb-ft.h" 34 35 #include "hb-font-private.hh" 36 37 #include FT_ADVANCES_H 38 #include FT_MULTIPLE_MASTERS_H 39 #include FT_TRUETYPE_TABLES_H 40 41 42 /* TODO: 43 * 44 * In general, this file does a fine job of what it's supposed to do. 45 * There are, however, things that need more work: 46 * 47 * - I remember seeing FT_Get_Advance() without the NO_HINTING flag to be buggy. 48 * Have not investigated. 49 * 50 * - FreeType works in 26.6 mode. Clients can decide to use that mode, and everything 51 * would work fine. However, we also abuse this API for performing in font-space, 52 * but don't pass the correct flags to FreeType. We just abuse the no-hinting mode 53 * for that, such that no rounding etc happens. As such, we don't set ppem, and 54 * pass NO_HINTING as load_flags. Would be much better to use NO_SCALE, and scale 55 * ourselves, like we do in uniscribe, etc. 56 * 57 * - We don't handle / allow for emboldening / obliqueing. 58 * 59 * - In the future, we should add constructors to create fonts in font space? 60 * 61 * - FT_Load_Glyph() is exteremely costly. Do something about it? 62 */ 63 64 65 struct hb_ft_font_t 66 { 67 FT_Face ft_face; 68 int load_flags; 69 bool symbol; /* Whether selected cmap is symbol cmap. */ 70 bool unref; /* Whether to destroy ft_face when done. */ 71 }; 72 73 static hb_ft_font_t * 74 _hb_ft_font_create (FT_Face ft_face, bool symbol, bool unref) 75 { 76 hb_ft_font_t *ft_font = (hb_ft_font_t *) calloc (1, sizeof (hb_ft_font_t)); 77 78 if (unlikely (!ft_font)) 79 return nullptr; 80 81 ft_font->ft_face = ft_face; 82 ft_font->symbol = symbol; 83 ft_font->unref = unref; 84 85 ft_font->load_flags = FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING; 86 87 return ft_font; 88 } 89 90 static void 91 _hb_ft_face_destroy (void *data) 92 { 93 FT_Done_Face ((FT_Face) data); 94 } 95 96 static void 97 _hb_ft_font_destroy (void *data) 98 { 99 hb_ft_font_t *ft_font = (hb_ft_font_t *) data; 100 101 if (ft_font->unref) 102 _hb_ft_face_destroy (ft_font->ft_face); 103 104 free (ft_font); 105 } 106 107 /** 108 * hb_ft_font_set_load_flags: 109 * @font: 110 * @load_flags: 111 * 112 * 113 * 114 * Since: 1.0.5 115 **/ 116 void 117 hb_ft_font_set_load_flags (hb_font_t *font, int load_flags) 118 { 119 if (font->immutable) 120 return; 121 122 if (font->destroy != _hb_ft_font_destroy) 123 return; 124 125 hb_ft_font_t *ft_font = (hb_ft_font_t *) font->user_data; 126 127 ft_font->load_flags = load_flags; 128 } 129 130 /** 131 * hb_ft_font_get_load_flags: 132 * @font: 133 * 134 * 135 * 136 * Return value: 137 * Since: 1.0.5 138 **/ 139 int 140 hb_ft_font_get_load_flags (hb_font_t *font) 141 { 142 if (font->destroy != _hb_ft_font_destroy) 143 return 0; 144 145 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font->user_data; 146 147 return ft_font->load_flags; 148 } 149 150 FT_Face 151 hb_ft_font_get_face (hb_font_t *font) 152 { 153 if (font->destroy != _hb_ft_font_destroy) 154 return nullptr; 155 156 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font->user_data; 157 158 return ft_font->ft_face; 159 } 160 161 162 163 static hb_bool_t 164 hb_ft_get_nominal_glyph (hb_font_t *font HB_UNUSED, 165 void *font_data, 166 hb_codepoint_t unicode, 167 hb_codepoint_t *glyph, 168 void *user_data HB_UNUSED) 169 { 170 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; 171 unsigned int g = FT_Get_Char_Index (ft_font->ft_face, unicode); 172 173 if (unlikely (!g)) 174 { 175 if (unlikely (ft_font->symbol) && unicode <= 0x00FFu) 176 { 177 /* For symbol-encoded OpenType fonts, we duplicate the 178 * U+F000..F0FF range at U+0000..U+00FF. That's what 179 * Windows seems to do, and that's hinted about at: 180 * http://www.microsoft.com/typography/otspec/recom.htm 181 * under "Non-Standard (Symbol) Fonts". */ 182 g = FT_Get_Char_Index (ft_font->ft_face, 0xF000u + unicode); 183 if (!g) 184 return false; 185 } 186 else 187 return false; 188 } 189 190 *glyph = g; 191 return true; 192 } 193 194 static hb_bool_t 195 hb_ft_get_variation_glyph (hb_font_t *font HB_UNUSED, 196 void *font_data, 197 hb_codepoint_t unicode, 198 hb_codepoint_t variation_selector, 199 hb_codepoint_t *glyph, 200 void *user_data HB_UNUSED) 201 { 202 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; 203 unsigned int g = FT_Face_GetCharVariantIndex (ft_font->ft_face, unicode, variation_selector); 204 205 if (unlikely (!g)) 206 return false; 207 208 *glyph = g; 209 return true; 210 } 211 212 static hb_position_t 213 hb_ft_get_glyph_h_advance (hb_font_t *font HB_UNUSED, 214 void *font_data, 215 hb_codepoint_t glyph, 216 void *user_data HB_UNUSED) 217 { 218 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; 219 FT_Fixed v; 220 221 if (unlikely (FT_Get_Advance (ft_font->ft_face, glyph, ft_font->load_flags, &v))) 222 return 0; 223 224 if (font->x_scale < 0) 225 v = -v; 226 227 return (v + (1<<9)) >> 10; 228 } 229 230 static hb_position_t 231 hb_ft_get_glyph_v_advance (hb_font_t *font HB_UNUSED, 232 void *font_data, 233 hb_codepoint_t glyph, 234 void *user_data HB_UNUSED) 235 { 236 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; 237 FT_Fixed v; 238 239 if (unlikely (FT_Get_Advance (ft_font->ft_face, glyph, ft_font->load_flags | FT_LOAD_VERTICAL_LAYOUT, &v))) 240 return 0; 241 242 if (font->y_scale < 0) 243 v = -v; 244 245 /* Note: FreeType's vertical metrics grows downward while other FreeType coordinates 246 * have a Y growing upward. Hence the extra negation. */ 247 return (-v + (1<<9)) >> 10; 248 } 249 250 static hb_bool_t 251 hb_ft_get_glyph_v_origin (hb_font_t *font HB_UNUSED, 252 void *font_data, 253 hb_codepoint_t glyph, 254 hb_position_t *x, 255 hb_position_t *y, 256 void *user_data HB_UNUSED) 257 { 258 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; 259 FT_Face ft_face = ft_font->ft_face; 260 261 if (unlikely (FT_Load_Glyph (ft_face, glyph, ft_font->load_flags))) 262 return false; 263 264 /* Note: FreeType's vertical metrics grows downward while other FreeType coordinates 265 * have a Y growing upward. Hence the extra negation. */ 266 *x = ft_face->glyph->metrics.horiBearingX - ft_face->glyph->metrics.vertBearingX; 267 *y = ft_face->glyph->metrics.horiBearingY - (-ft_face->glyph->metrics.vertBearingY); 268 269 if (font->x_scale < 0) 270 *x = -*x; 271 if (font->y_scale < 0) 272 *y = -*y; 273 274 return true; 275 } 276 277 static hb_position_t 278 hb_ft_get_glyph_h_kerning (hb_font_t *font, 279 void *font_data, 280 hb_codepoint_t left_glyph, 281 hb_codepoint_t right_glyph, 282 void *user_data HB_UNUSED) 283 { 284 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; 285 FT_Vector kerningv; 286 287 FT_Kerning_Mode mode = font->x_ppem ? FT_KERNING_DEFAULT : FT_KERNING_UNFITTED; 288 if (FT_Get_Kerning (ft_font->ft_face, left_glyph, right_glyph, mode, &kerningv)) 289 return 0; 290 291 return kerningv.x; 292 } 293 294 static hb_bool_t 295 hb_ft_get_glyph_extents (hb_font_t *font HB_UNUSED, 296 void *font_data, 297 hb_codepoint_t glyph, 298 hb_glyph_extents_t *extents, 299 void *user_data HB_UNUSED) 300 { 301 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; 302 FT_Face ft_face = ft_font->ft_face; 303 304 if (unlikely (FT_Load_Glyph (ft_face, glyph, ft_font->load_flags))) 305 return false; 306 307 extents->x_bearing = ft_face->glyph->metrics.horiBearingX; 308 extents->y_bearing = ft_face->glyph->metrics.horiBearingY; 309 extents->width = ft_face->glyph->metrics.width; 310 extents->height = -ft_face->glyph->metrics.height; 311 if (font->x_scale < 0) 312 { 313 extents->x_bearing = -extents->x_bearing; 314 extents->width = -extents->width; 315 } 316 if (font->y_scale < 0) 317 { 318 extents->y_bearing = -extents->y_bearing; 319 extents->height = -extents->height; 320 } 321 return true; 322 } 323 324 static hb_bool_t 325 hb_ft_get_glyph_contour_point (hb_font_t *font HB_UNUSED, 326 void *font_data, 327 hb_codepoint_t glyph, 328 unsigned int point_index, 329 hb_position_t *x, 330 hb_position_t *y, 331 void *user_data HB_UNUSED) 332 { 333 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; 334 FT_Face ft_face = ft_font->ft_face; 335 336 if (unlikely (FT_Load_Glyph (ft_face, glyph, ft_font->load_flags))) 337 return false; 338 339 if (unlikely (ft_face->glyph->format != FT_GLYPH_FORMAT_OUTLINE)) 340 return false; 341 342 if (unlikely (point_index >= (unsigned int) ft_face->glyph->outline.n_points)) 343 return false; 344 345 *x = ft_face->glyph->outline.points[point_index].x; 346 *y = ft_face->glyph->outline.points[point_index].y; 347 348 return true; 349 } 350 351 static hb_bool_t 352 hb_ft_get_glyph_name (hb_font_t *font HB_UNUSED, 353 void *font_data, 354 hb_codepoint_t glyph, 355 char *name, unsigned int size, 356 void *user_data HB_UNUSED) 357 { 358 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; 359 360 hb_bool_t ret = !FT_Get_Glyph_Name (ft_font->ft_face, glyph, name, size); 361 if (ret && (size && !*name)) 362 ret = false; 363 364 return ret; 365 } 366 367 static hb_bool_t 368 hb_ft_get_glyph_from_name (hb_font_t *font HB_UNUSED, 369 void *font_data, 370 const char *name, int len, /* -1 means nul-terminated */ 371 hb_codepoint_t *glyph, 372 void *user_data HB_UNUSED) 373 { 374 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; 375 FT_Face ft_face = ft_font->ft_face; 376 377 if (len < 0) 378 *glyph = FT_Get_Name_Index (ft_face, (FT_String *) name); 379 else { 380 /* Make a nul-terminated version. */ 381 char buf[128]; 382 len = MIN (len, (int) sizeof (buf) - 1); 383 strncpy (buf, name, len); 384 buf[len] = '\0'; 385 *glyph = FT_Get_Name_Index (ft_face, buf); 386 } 387 388 if (*glyph == 0) 389 { 390 /* Check whether the given name was actually the name of glyph 0. */ 391 char buf[128]; 392 if (!FT_Get_Glyph_Name(ft_face, 0, buf, sizeof (buf)) && 393 len < 0 ? !strcmp (buf, name) : !strncmp (buf, name, len)) 394 return true; 395 } 396 397 return *glyph != 0; 398 } 399 400 static hb_bool_t 401 hb_ft_get_font_h_extents (hb_font_t *font HB_UNUSED, 402 void *font_data, 403 hb_font_extents_t *metrics, 404 void *user_data HB_UNUSED) 405 { 406 const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data; 407 FT_Face ft_face = ft_font->ft_face; 408 metrics->ascender = ft_face->size->metrics.ascender; 409 metrics->descender = ft_face->size->metrics.descender; 410 metrics->line_gap = ft_face->size->metrics.height - (ft_face->size->metrics.ascender - ft_face->size->metrics.descender); 411 if (font->y_scale < 0) 412 { 413 metrics->ascender = -metrics->ascender; 414 metrics->descender = -metrics->descender; 415 metrics->line_gap = -metrics->line_gap; 416 } 417 return true; 418 } 419 420 static hb_font_funcs_t *static_ft_funcs = nullptr; 421 422 #ifdef HB_USE_ATEXIT 423 static 424 void free_static_ft_funcs (void) 425 { 426 hb_font_funcs_destroy (static_ft_funcs); 427 } 428 #endif 429 430 static void 431 _hb_ft_font_set_funcs (hb_font_t *font, FT_Face ft_face, bool unref) 432 { 433 retry: 434 hb_font_funcs_t *funcs = (hb_font_funcs_t *) hb_atomic_ptr_get (&static_ft_funcs); 435 436 if (unlikely (!funcs)) 437 { 438 funcs = hb_font_funcs_create (); 439 440 hb_font_funcs_set_font_h_extents_func (funcs, hb_ft_get_font_h_extents, nullptr, nullptr); 441 //hb_font_funcs_set_font_v_extents_func (funcs, hb_ft_get_font_v_extents, nullptr, nullptr); 442 hb_font_funcs_set_nominal_glyph_func (funcs, hb_ft_get_nominal_glyph, nullptr, nullptr); 443 hb_font_funcs_set_variation_glyph_func (funcs, hb_ft_get_variation_glyph, nullptr, nullptr); 444 hb_font_funcs_set_glyph_h_advance_func (funcs, hb_ft_get_glyph_h_advance, nullptr, nullptr); 445 hb_font_funcs_set_glyph_v_advance_func (funcs, hb_ft_get_glyph_v_advance, nullptr, nullptr); 446 //hb_font_funcs_set_glyph_h_origin_func (funcs, hb_ft_get_glyph_h_origin, nullptr, nullptr); 447 hb_font_funcs_set_glyph_v_origin_func (funcs, hb_ft_get_glyph_v_origin, nullptr, nullptr); 448 hb_font_funcs_set_glyph_h_kerning_func (funcs, hb_ft_get_glyph_h_kerning, nullptr, nullptr); 449 //hb_font_funcs_set_glyph_v_kerning_func (funcs, hb_ft_get_glyph_v_kerning, nullptr, nullptr); 450 hb_font_funcs_set_glyph_extents_func (funcs, hb_ft_get_glyph_extents, nullptr, nullptr); 451 hb_font_funcs_set_glyph_contour_point_func (funcs, hb_ft_get_glyph_contour_point, nullptr, nullptr); 452 hb_font_funcs_set_glyph_name_func (funcs, hb_ft_get_glyph_name, nullptr, nullptr); 453 hb_font_funcs_set_glyph_from_name_func (funcs, hb_ft_get_glyph_from_name, nullptr, nullptr); 454 455 hb_font_funcs_make_immutable (funcs); 456 457 if (!hb_atomic_ptr_cmpexch (&static_ft_funcs, nullptr, funcs)) { 458 hb_font_funcs_destroy (funcs); 459 goto retry; 460 } 461 462 #ifdef HB_USE_ATEXIT 463 atexit (free_static_ft_funcs); /* First person registers atexit() callback. */ 464 #endif 465 }; 466 467 bool symbol = ft_face->charmap && ft_face->charmap->encoding == FT_ENCODING_MS_SYMBOL; 468 469 hb_font_set_funcs (font, 470 funcs, 471 _hb_ft_font_create (ft_face, symbol, unref), 472 _hb_ft_font_destroy); 473 } 474 475 476 static hb_blob_t * 477 reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data) 478 { 479 FT_Face ft_face = (FT_Face) user_data; 480 FT_Byte *buffer; 481 FT_ULong length = 0; 482 FT_Error error; 483 484 /* Note: FreeType like HarfBuzz uses the NONE tag for fetching the entire blob */ 485 486 error = FT_Load_Sfnt_Table (ft_face, tag, 0, nullptr, &length); 487 if (error) 488 return nullptr; 489 490 buffer = (FT_Byte *) malloc (length); 491 if (!buffer) 492 return nullptr; 493 494 error = FT_Load_Sfnt_Table (ft_face, tag, 0, buffer, &length); 495 if (error) 496 return nullptr; 497 498 return hb_blob_create ((const char *) buffer, length, 499 HB_MEMORY_MODE_WRITABLE, 500 buffer, free); 501 } 502 503 /** 504 * hb_ft_face_create: 505 * @ft_face: (destroy destroy) (scope notified): 506 * @destroy: 507 * 508 * 509 * 510 * Return value: (transfer full): 511 * Since: 0.9.2 512 **/ 513 hb_face_t * 514 hb_ft_face_create (FT_Face ft_face, 515 hb_destroy_func_t destroy) 516 { 517 hb_face_t *face; 518 519 if (!ft_face->stream->read) { 520 hb_blob_t *blob; 521 522 blob = hb_blob_create ((const char *) ft_face->stream->base, 523 (unsigned int) ft_face->stream->size, 524 HB_MEMORY_MODE_READONLY, 525 ft_face, destroy); 526 face = hb_face_create (blob, ft_face->face_index); 527 hb_blob_destroy (blob); 528 } else { 529 face = hb_face_create_for_tables (reference_table, ft_face, destroy); 530 } 531 532 hb_face_set_index (face, ft_face->face_index); 533 hb_face_set_upem (face, ft_face->units_per_EM); 534 535 return face; 536 } 537 538 /** 539 * hb_ft_face_create_referenced: 540 * @ft_face: 541 * 542 * 543 * 544 * Return value: (transfer full): 545 * Since: 0.9.38 546 **/ 547 hb_face_t * 548 hb_ft_face_create_referenced (FT_Face ft_face) 549 { 550 FT_Reference_Face (ft_face); 551 return hb_ft_face_create (ft_face, _hb_ft_face_destroy); 552 } 553 554 static void 555 hb_ft_face_finalize (FT_Face ft_face) 556 { 557 hb_face_destroy ((hb_face_t *) ft_face->generic.data); 558 } 559 560 /** 561 * hb_ft_face_create_cached: 562 * @ft_face: 563 * 564 * 565 * 566 * Return value: (transfer full): 567 * Since: 0.9.2 568 **/ 569 hb_face_t * 570 hb_ft_face_create_cached (FT_Face ft_face) 571 { 572 if (unlikely (!ft_face->generic.data || ft_face->generic.finalizer != (FT_Generic_Finalizer) hb_ft_face_finalize)) 573 { 574 if (ft_face->generic.finalizer) 575 ft_face->generic.finalizer (ft_face); 576 577 ft_face->generic.data = hb_ft_face_create (ft_face, nullptr); 578 ft_face->generic.finalizer = (FT_Generic_Finalizer) hb_ft_face_finalize; 579 } 580 581 return hb_face_reference ((hb_face_t *) ft_face->generic.data); 582 } 583 584 585 /** 586 * hb_ft_font_create: 587 * @ft_face: (destroy destroy) (scope notified): 588 * @destroy: 589 * 590 * 591 * 592 * Return value: (transfer full): 593 * Since: 0.9.2 594 **/ 595 hb_font_t * 596 hb_ft_font_create (FT_Face ft_face, 597 hb_destroy_func_t destroy) 598 { 599 hb_font_t *font; 600 hb_face_t *face; 601 602 face = hb_ft_face_create (ft_face, destroy); 603 font = hb_font_create (face); 604 hb_face_destroy (face); 605 _hb_ft_font_set_funcs (font, ft_face, false); 606 hb_ft_font_changed (font); 607 return font; 608 } 609 610 void 611 hb_ft_font_changed (hb_font_t *font) 612 { 613 if (font->destroy != _hb_ft_font_destroy) 614 return; 615 616 hb_ft_font_t *ft_font = (hb_ft_font_t *) font->user_data; 617 FT_Face ft_face = ft_font->ft_face; 618 619 hb_font_set_scale (font, 620 (int) (((uint64_t) ft_face->size->metrics.x_scale * (uint64_t) ft_face->units_per_EM + (1u<<15)) >> 16), 621 (int) (((uint64_t) ft_face->size->metrics.y_scale * (uint64_t) ft_face->units_per_EM + (1u<<15)) >> 16)); 622 #if 0 /* hb-ft works in no-hinting model */ 623 hb_font_set_ppem (font, 624 ft_face->size->metrics.x_ppem, 625 ft_face->size->metrics.y_ppem); 626 #endif 627 628 #ifdef HAVE_FT_GET_VAR_BLEND_COORDINATES 629 FT_MM_Var *mm_var = nullptr; 630 if (!FT_Get_MM_Var (ft_face, &mm_var)) 631 { 632 FT_Fixed *ft_coords = (FT_Fixed *) calloc (mm_var->num_axis, sizeof (FT_Fixed)); 633 int *coords = (int *) calloc (mm_var->num_axis, sizeof (int)); 634 if (coords && ft_coords) 635 { 636 if (!FT_Get_Var_Blend_Coordinates (ft_face, mm_var->num_axis, ft_coords)) 637 { 638 for (unsigned int i = 0; i < mm_var->num_axis; ++i) 639 coords[i] = ft_coords[i] >>= 2; 640 641 hb_font_set_var_coords_normalized (font, coords, mm_var->num_axis); 642 } 643 } 644 free (coords); 645 free (ft_coords); 646 free (mm_var); 647 } 648 #endif 649 } 650 651 /** 652 * hb_ft_font_create_referenced: 653 * @ft_face: 654 * 655 * 656 * 657 * Return value: (transfer full): 658 * Since: 0.9.38 659 **/ 660 hb_font_t * 661 hb_ft_font_create_referenced (FT_Face ft_face) 662 { 663 FT_Reference_Face (ft_face); 664 return hb_ft_font_create (ft_face, _hb_ft_face_destroy); 665 } 666 667 668 /* Thread-safe, lock-free, FT_Library */ 669 670 static FT_Library ft_library; 671 672 #ifdef HB_USE_ATEXIT 673 static 674 void free_ft_library (void) 675 { 676 FT_Done_FreeType (ft_library); 677 } 678 #endif 679 680 static FT_Library 681 get_ft_library (void) 682 { 683 retry: 684 FT_Library library = (FT_Library) hb_atomic_ptr_get (&ft_library); 685 686 if (unlikely (!library)) 687 { 688 /* Not found; allocate one. */ 689 if (FT_Init_FreeType (&library)) 690 return nullptr; 691 692 if (!hb_atomic_ptr_cmpexch (&ft_library, nullptr, library)) { 693 FT_Done_FreeType (library); 694 goto retry; 695 } 696 697 #ifdef HB_USE_ATEXIT 698 atexit (free_ft_library); /* First person registers atexit() callback. */ 699 #endif 700 } 701 702 return library; 703 } 704 705 static void 706 _release_blob (FT_Face ft_face) 707 { 708 hb_blob_destroy ((hb_blob_t *) ft_face->generic.data); 709 } 710 711 void 712 hb_ft_font_set_funcs (hb_font_t *font) 713 { 714 hb_blob_t *blob = hb_face_reference_blob (font->face); 715 unsigned int blob_length; 716 const char *blob_data = hb_blob_get_data (blob, &blob_length); 717 if (unlikely (!blob_length)) 718 DEBUG_MSG (FT, font, "Font face has empty blob"); 719 720 FT_Face ft_face = nullptr; 721 FT_Error err = FT_New_Memory_Face (get_ft_library (), 722 (const FT_Byte *) blob_data, 723 blob_length, 724 hb_face_get_index (font->face), 725 &ft_face); 726 727 if (unlikely (err)) { 728 hb_blob_destroy (blob); 729 DEBUG_MSG (FT, font, "Font face FT_New_Memory_Face() failed"); 730 return; 731 } 732 733 if (FT_Select_Charmap (ft_face, FT_ENCODING_UNICODE)) 734 FT_Select_Charmap (ft_face, FT_ENCODING_MS_SYMBOL); 735 736 FT_Set_Char_Size (ft_face, 737 abs (font->x_scale), abs (font->y_scale), 738 0, 0); 739 #if 0 740 font->x_ppem * 72 * 64 / font->x_scale, 741 font->y_ppem * 72 * 64 / font->y_scale); 742 #endif 743 if (font->x_scale < 0 || font->y_scale < 0) 744 { 745 FT_Matrix matrix = { font->x_scale < 0 ? -1 : +1, 0, 746 0, font->y_scale < 0 ? -1 : +1}; 747 FT_Set_Transform (ft_face, &matrix, nullptr); 748 } 749 750 #ifdef HAVE_FT_SET_VAR_BLEND_COORDINATES 751 unsigned int num_coords; 752 const int *coords = hb_font_get_var_coords_normalized (font, &num_coords); 753 if (num_coords) 754 { 755 FT_Fixed *ft_coords = (FT_Fixed *) calloc (num_coords, sizeof (FT_Fixed)); 756 if (ft_coords) 757 { 758 for (unsigned int i = 0; i < num_coords; i++) 759 ft_coords[i] = coords[i] << 2; 760 FT_Set_Var_Blend_Coordinates (ft_face, num_coords, ft_coords); 761 free (ft_coords); 762 } 763 } 764 #endif 765 766 ft_face->generic.data = blob; 767 ft_face->generic.finalizer = (FT_Generic_Finalizer) _release_blob; 768 769 _hb_ft_font_set_funcs (font, ft_face, true); 770 hb_ft_font_set_load_flags (font, FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING); 771 } 772
