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