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