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comparison: gfx/harfbuzz/src/hb-uniscribe.cc

gfx/harfbuzz/src/hb-uniscribe.cc

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TOR_BUG_9701
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-1:000000000000 0:612aa9179e97
1 /*
2 * Copyright © 2011,2012,2013 Google, Inc.
3 *
4 * This is part of HarfBuzz, a text shaping library.
5 *
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
11 *
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
16 * DAMAGE.
17 *
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
23 *
24 * Google Author(s): Behdad Esfahbod
25 */
26
27 #define _WIN32_WINNT 0x0600
28 #define WIN32_LEAN_AND_MEAN
29
30 #define HB_SHAPER uniscribe
31 #include "hb-shaper-impl-private.hh"
32
33 #include <windows.h>
34 #include <usp10.h>
35 #include <rpc.h>
36
37 #include "hb-uniscribe.h"
38
39 #include "hb-open-file-private.hh"
40 #include "hb-ot-name-table.hh"
41 #include "hb-ot-tag.h"
42
43
44 #ifndef HB_DEBUG_UNISCRIBE
45 #define HB_DEBUG_UNISCRIBE (HB_DEBUG+0)
46 #endif
47
48
49 typedef HRESULT (WINAPI *SIOT) /*ScriptItemizeOpenType*/(
50 const WCHAR *pwcInChars,
51 int cInChars,
52 int cMaxItems,
53 const SCRIPT_CONTROL *psControl,
54 const SCRIPT_STATE *psState,
55 SCRIPT_ITEM *pItems,
56 OPENTYPE_TAG *pScriptTags,
57 int *pcItems
58 );
59
60 typedef HRESULT (WINAPI *SSOT) /*ScriptShapeOpenType*/(
61 HDC hdc,
62 SCRIPT_CACHE *psc,
63 SCRIPT_ANALYSIS *psa,
64 OPENTYPE_TAG tagScript,
65 OPENTYPE_TAG tagLangSys,
66 int *rcRangeChars,
67 TEXTRANGE_PROPERTIES **rpRangeProperties,
68 int cRanges,
69 const WCHAR *pwcChars,
70 int cChars,
71 int cMaxGlyphs,
72 WORD *pwLogClust,
73 SCRIPT_CHARPROP *pCharProps,
74 WORD *pwOutGlyphs,
75 SCRIPT_GLYPHPROP *pOutGlyphProps,
76 int *pcGlyphs
77 );
78
79 typedef HRESULT (WINAPI *SPOT) /*ScriptPlaceOpenType*/(
80 HDC hdc,
81 SCRIPT_CACHE *psc,
82 SCRIPT_ANALYSIS *psa,
83 OPENTYPE_TAG tagScript,
84 OPENTYPE_TAG tagLangSys,
85 int *rcRangeChars,
86 TEXTRANGE_PROPERTIES **rpRangeProperties,
87 int cRanges,
88 const WCHAR *pwcChars,
89 WORD *pwLogClust,
90 SCRIPT_CHARPROP *pCharProps,
91 int cChars,
92 const WORD *pwGlyphs,
93 const SCRIPT_GLYPHPROP *pGlyphProps,
94 int cGlyphs,
95 int *piAdvance,
96 GOFFSET *pGoffset,
97 ABC *pABC
98 );
99
100
101 /* Fallback implementations. */
102
103 static HRESULT WINAPI
104 hb_ScriptItemizeOpenType(
105 const WCHAR *pwcInChars,
106 int cInChars,
107 int cMaxItems,
108 const SCRIPT_CONTROL *psControl,
109 const SCRIPT_STATE *psState,
110 SCRIPT_ITEM *pItems,
111 OPENTYPE_TAG *pScriptTags,
112 int *pcItems
113 )
114 {
115 {
116 return ScriptItemize (pwcInChars,
117 cInChars,
118 cMaxItems,
119 psControl,
120 psState,
121 pItems,
122 pcItems);
123 }
124 }
125
126 static HRESULT WINAPI
127 hb_ScriptShapeOpenType(
128 HDC hdc,
129 SCRIPT_CACHE *psc,
130 SCRIPT_ANALYSIS *psa,
131 OPENTYPE_TAG tagScript,
132 OPENTYPE_TAG tagLangSys,
133 int *rcRangeChars,
134 TEXTRANGE_PROPERTIES **rpRangeProperties,
135 int cRanges,
136 const WCHAR *pwcChars,
137 int cChars,
138 int cMaxGlyphs,
139 WORD *pwLogClust,
140 SCRIPT_CHARPROP *pCharProps,
141 WORD *pwOutGlyphs,
142 SCRIPT_GLYPHPROP *pOutGlyphProps,
143 int *pcGlyphs
144 )
145 {
146 SCRIPT_VISATTR *psva = (SCRIPT_VISATTR *) pOutGlyphProps;
147 return ScriptShape (hdc,
148 psc,
149 pwcChars,
150 cChars,
151 cMaxGlyphs,
152 psa,
153 pwOutGlyphs,
154 pwLogClust,
155 psva,
156 pcGlyphs);
157 }
158
159 static HRESULT WINAPI
160 hb_ScriptPlaceOpenType(
161 HDC hdc,
162 SCRIPT_CACHE *psc,
163 SCRIPT_ANALYSIS *psa,
164 OPENTYPE_TAG tagScript,
165 OPENTYPE_TAG tagLangSys,
166 int *rcRangeChars,
167 TEXTRANGE_PROPERTIES **rpRangeProperties,
168 int cRanges,
169 const WCHAR *pwcChars,
170 WORD *pwLogClust,
171 SCRIPT_CHARPROP *pCharProps,
172 int cChars,
173 const WORD *pwGlyphs,
174 const SCRIPT_GLYPHPROP *pGlyphProps,
175 int cGlyphs,
176 int *piAdvance,
177 GOFFSET *pGoffset,
178 ABC *pABC
179 )
180 {
181 SCRIPT_VISATTR *psva = (SCRIPT_VISATTR *) pGlyphProps;
182 return ScriptPlace (hdc,
183 psc,
184 pwGlyphs,
185 cGlyphs,
186 psva,
187 psa,
188 piAdvance,
189 pGoffset,
190 pABC);
191 }
192
193
194 struct hb_uniscribe_shaper_funcs_t {
195 SIOT ScriptItemizeOpenType;
196 SSOT ScriptShapeOpenType;
197 SPOT ScriptPlaceOpenType;
198
199 inline void init (void)
200 {
201 HMODULE hinstLib;
202 this->ScriptItemizeOpenType = NULL;
203 this->ScriptShapeOpenType = NULL;
204 this->ScriptPlaceOpenType = NULL;
205
206 hinstLib = GetModuleHandle (TEXT ("usp10.dll"));
207 if (hinstLib)
208 {
209 this->ScriptItemizeOpenType = (SIOT) GetProcAddress (hinstLib, "ScriptItemizeOpenType");
210 this->ScriptShapeOpenType = (SSOT) GetProcAddress (hinstLib, "ScriptShapeOpenType");
211 this->ScriptPlaceOpenType = (SPOT) GetProcAddress (hinstLib, "ScriptPlaceOpenType");
212 }
213 if (!this->ScriptItemizeOpenType ||
214 !this->ScriptShapeOpenType ||
215 !this->ScriptPlaceOpenType)
216 {
217 DEBUG_MSG (UNISCRIBE, NULL, "OpenType versions of functions not found; falling back.");
218 this->ScriptItemizeOpenType = hb_ScriptItemizeOpenType;
219 this->ScriptShapeOpenType = hb_ScriptShapeOpenType;
220 this->ScriptPlaceOpenType = hb_ScriptPlaceOpenType;
221 }
222 }
223 };
224 static hb_uniscribe_shaper_funcs_t *uniscribe_funcs;
225
226 static inline void
227 free_uniscribe_funcs (void)
228 {
229 free (uniscribe_funcs);
230 }
231
232 static hb_uniscribe_shaper_funcs_t *
233 hb_uniscribe_shaper_get_funcs (void)
234 {
235 retry:
236 hb_uniscribe_shaper_funcs_t *funcs = (hb_uniscribe_shaper_funcs_t *) hb_atomic_ptr_get (&uniscribe_funcs);
237
238 if (unlikely (!funcs))
239 {
240 funcs = (hb_uniscribe_shaper_funcs_t *) calloc (1, sizeof (hb_uniscribe_shaper_funcs_t));
241 if (unlikely (!funcs))
242 return NULL;
243
244 funcs->init ();
245
246 if (!hb_atomic_ptr_cmpexch (&uniscribe_funcs, NULL, funcs)) {
247 free (funcs);
248 goto retry;
249 }
250
251 #ifdef HAVE_ATEXIT
252 atexit (free_uniscribe_funcs); /* First person registers atexit() callback. */
253 #endif
254 }
255
256 return funcs;
257 }
258
259
260 struct active_feature_t {
261 OPENTYPE_FEATURE_RECORD rec;
262 unsigned int order;
263
264 static int cmp (const active_feature_t *a, const active_feature_t *b) {
265 return a->rec.tagFeature < b->rec.tagFeature ? -1 : a->rec.tagFeature > b->rec.tagFeature ? 1 :
266 a->order < b->order ? -1 : a->order > b->order ? 1 :
267 a->rec.lParameter < b->rec.lParameter ? -1 : a->rec.lParameter > b->rec.lParameter ? 1 :
268 0;
269 }
270 bool operator== (const active_feature_t *f) {
271 return cmp (this, f) == 0;
272 }
273 };
274
275 struct feature_event_t {
276 unsigned int index;
277 bool start;
278 active_feature_t feature;
279
280 static int cmp (const feature_event_t *a, const feature_event_t *b) {
281 return a->index < b->index ? -1 : a->index > b->index ? 1 :
282 a->start < b->start ? -1 : a->start > b->start ? 1 :
283 active_feature_t::cmp (&a->feature, &b->feature);
284 }
285 };
286
287 struct range_record_t {
288 TEXTRANGE_PROPERTIES props;
289 unsigned int index_first; /* == start */
290 unsigned int index_last; /* == end - 1 */
291 };
292
293 HB_SHAPER_DATA_ENSURE_DECLARE(uniscribe, face)
294 HB_SHAPER_DATA_ENSURE_DECLARE(uniscribe, font)
295
296
297 /*
298 * shaper face data
299 */
300
301 struct hb_uniscribe_shaper_face_data_t {
302 HANDLE fh;
303 hb_uniscribe_shaper_funcs_t *funcs;
304 wchar_t face_name[LF_FACESIZE];
305 };
306
307 /* face_name should point to a wchar_t[LF_FACESIZE] object. */
308 static void
309 _hb_generate_unique_face_name (wchar_t *face_name, unsigned int *plen)
310 {
311 /* We'll create a private name for the font from a UUID using a simple,
312 * somewhat base64-like encoding scheme */
313 const char *enc = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+-";
314 UUID id;
315 UuidCreate ((UUID*) &id);
316 unsigned int name_str_len = 0;
317 face_name[name_str_len++] = 'F';
318 face_name[name_str_len++] = '_';
319 unsigned char *p = (unsigned char *) &id;
320 for (unsigned int i = 0; i < 16; i += 2)
321 {
322 /* Spread the 16 bits from two bytes of the UUID across three chars of face_name,
323 * using the bits in groups of 5,5,6 to select chars from enc.
324 * This will generate 24 characters; with the 'F_' prefix we already provided,
325 * the name will be 26 chars (plus the NUL terminator), so will always fit within
326 * face_name (LF_FACESIZE = 32). */
327 face_name[name_str_len++] = enc[p[i] >> 3];
328 face_name[name_str_len++] = enc[((p[i] << 2) | (p[i + 1] >> 6)) & 0x1f];
329 face_name[name_str_len++] = enc[p[i + 1] & 0x3f];
330 }
331 face_name[name_str_len] = 0;
332 if (plen)
333 *plen = name_str_len;
334 }
335
336 /* Destroys blob. */
337 static hb_blob_t *
338 _hb_rename_font (hb_blob_t *blob, wchar_t *new_name)
339 {
340 /* Create a copy of the font data, with the 'name' table replaced by a
341 * table that names the font with our private F_* name created above.
342 * For simplicity, we just append a new 'name' table and update the
343 * sfnt directory; the original table is left in place, but unused.
344 *
345 * The new table will contain just 5 name IDs: family, style, unique,
346 * full, PS. All of them point to the same name data with our unique name.
347 */
348
349 blob = OT::Sanitizer<OT::OpenTypeFontFile>::sanitize (blob);
350
351 unsigned int length, new_length, name_str_len;
352 const char *orig_sfnt_data = hb_blob_get_data (blob, &length);
353
354 _hb_generate_unique_face_name (new_name, &name_str_len);
355
356 static const uint16_t name_IDs[] = { 1, 2, 3, 4, 6 };
357
358 unsigned int name_table_length = OT::name::min_size +
359 ARRAY_LENGTH (name_IDs) * OT::NameRecord::static_size +
360 name_str_len * 2; /* for name data in UTF16BE form */
361 unsigned int name_table_offset = (length + 3) & ~3;
362
363 new_length = name_table_offset + ((name_table_length + 3) & ~3);
364 void *new_sfnt_data = calloc (1, new_length);
365 if (!new_sfnt_data)
366 {
367 hb_blob_destroy (blob);
368 return NULL;
369 }
370
371 memcpy(new_sfnt_data, orig_sfnt_data, length);
372
373 OT::name &name = OT::StructAtOffset<OT::name> (new_sfnt_data, name_table_offset);
374 name.format.set (0);
375 name.count.set (ARRAY_LENGTH (name_IDs));
376 name.stringOffset.set (name.get_size ());
377 for (unsigned int i = 0; i < ARRAY_LENGTH (name_IDs); i++)
378 {
379 OT::NameRecord &record = name.nameRecord[i];
380 record.platformID.set (3);
381 record.encodingID.set (1);
382 record.languageID.set (0x0409); /* English */
383 record.nameID.set (name_IDs[i]);
384 record.length.set (name_str_len * 2);
385 record.offset.set (0);
386 }
387
388 /* Copy string data from new_name, converting wchar_t to UTF16BE. */
389 unsigned char *p = &OT::StructAfter<unsigned char> (name);
390 for (unsigned int i = 0; i < name_str_len; i++)
391 {
392 *p++ = new_name[i] >> 8;
393 *p++ = new_name[i] & 0xff;
394 }
395
396 /* Adjust name table entry to point to new name table */
397 const OT::OpenTypeFontFile &file = * (OT::OpenTypeFontFile *) (new_sfnt_data);
398 unsigned int face_count = file.get_face_count ();
399 for (unsigned int face_index = 0; face_index < face_count; face_index++)
400 {
401 /* Note: doing multiple edits (ie. TTC) can be unsafe. There may be
402 * toe-stepping. But we don't really care. */
403 const OT::OpenTypeFontFace &face = file.get_face (face_index);
404 unsigned int index;
405 if (face.find_table_index (HB_OT_TAG_name, &index))
406 {
407 OT::TableRecord &record = const_cast<OT::TableRecord &> (face.get_table (index));
408 record.checkSum.set_for_data (&name, name_table_length);
409 record.offset.set (name_table_offset);
410 record.length.set (name_table_length);
411 }
412 else if (face_index == 0) /* Fail if first face doesn't have 'name' table. */
413 {
414 free (new_sfnt_data);
415 hb_blob_destroy (blob);
416 return NULL;
417 }
418 }
419
420 /* The checkSumAdjustment field in the 'head' table is now wrong,
421 * but that doesn't actually seem to cause any problems so we don't
422 * bother. */
423
424 hb_blob_destroy (blob);
425 return hb_blob_create ((const char *) new_sfnt_data, new_length,
426 HB_MEMORY_MODE_WRITABLE, NULL, free);
427 }
428
429 hb_uniscribe_shaper_face_data_t *
430 _hb_uniscribe_shaper_face_data_create (hb_face_t *face)
431 {
432 hb_uniscribe_shaper_face_data_t *data = (hb_uniscribe_shaper_face_data_t *) calloc (1, sizeof (hb_uniscribe_shaper_face_data_t));
433 if (unlikely (!data))
434 return NULL;
435
436 data->funcs = hb_uniscribe_shaper_get_funcs ();
437 if (unlikely (!data->funcs))
438 {
439 free (data);
440 return NULL;
441 }
442
443 hb_blob_t *blob = hb_face_reference_blob (face);
444 if (unlikely (!hb_blob_get_length (blob)))
445 DEBUG_MSG (UNISCRIBE, face, "Face has empty blob");
446
447 blob = _hb_rename_font (blob, data->face_name);
448 if (unlikely (!blob))
449 {
450 free (data);
451 return NULL;
452 }
453
454 DWORD num_fonts_installed;
455 data->fh = AddFontMemResourceEx ((void *) hb_blob_get_data (blob, NULL),
456 hb_blob_get_length (blob),
457 0, &num_fonts_installed);
458 if (unlikely (!data->fh))
459 {
460 DEBUG_MSG (UNISCRIBE, face, "Face AddFontMemResourceEx() failed");
461 free (data);
462 return NULL;
463 }
464
465 return data;
466 }
467
468 void
469 _hb_uniscribe_shaper_face_data_destroy (hb_uniscribe_shaper_face_data_t *data)
470 {
471 RemoveFontMemResourceEx (data->fh);
472 free (data);
473 }
474
475
476 /*
477 * shaper font data
478 */
479
480 struct hb_uniscribe_shaper_font_data_t {
481 HDC hdc;
482 LOGFONTW log_font;
483 HFONT hfont;
484 SCRIPT_CACHE script_cache;
485 };
486
487 static bool
488 populate_log_font (LOGFONTW *lf,
489 hb_font_t *font)
490 {
491 memset (lf, 0, sizeof (*lf));
492 lf->lfHeight = -font->y_scale;
493 lf->lfCharSet = DEFAULT_CHARSET;
494
495 hb_face_t *face = font->face;
496 hb_uniscribe_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
497
498 memcpy (lf->lfFaceName, face_data->face_name, sizeof (lf->lfFaceName));
499
500 return true;
501 }
502
503 hb_uniscribe_shaper_font_data_t *
504 _hb_uniscribe_shaper_font_data_create (hb_font_t *font)
505 {
506 if (unlikely (!hb_uniscribe_shaper_face_data_ensure (font->face))) return NULL;
507
508 hb_uniscribe_shaper_font_data_t *data = (hb_uniscribe_shaper_font_data_t *) calloc (1, sizeof (hb_uniscribe_shaper_font_data_t));
509 if (unlikely (!data))
510 return NULL;
511
512 data->hdc = GetDC (NULL);
513
514 if (unlikely (!populate_log_font (&data->log_font, font))) {
515 DEBUG_MSG (UNISCRIBE, font, "Font populate_log_font() failed");
516 _hb_uniscribe_shaper_font_data_destroy (data);
517 return NULL;
518 }
519
520 data->hfont = CreateFontIndirectW (&data->log_font);
521 if (unlikely (!data->hfont)) {
522 DEBUG_MSG (UNISCRIBE, font, "Font CreateFontIndirectW() failed");
523 _hb_uniscribe_shaper_font_data_destroy (data);
524 return NULL;
525 }
526
527 if (!SelectObject (data->hdc, data->hfont)) {
528 DEBUG_MSG (UNISCRIBE, font, "Font SelectObject() failed");
529 _hb_uniscribe_shaper_font_data_destroy (data);
530 return NULL;
531 }
532
533 return data;
534 }
535
536 void
537 _hb_uniscribe_shaper_font_data_destroy (hb_uniscribe_shaper_font_data_t *data)
538 {
539 if (data->hdc)
540 ReleaseDC (NULL, data->hdc);
541 if (data->hfont)
542 DeleteObject (data->hfont);
543 if (data->script_cache)
544 ScriptFreeCache (&data->script_cache);
545 free (data);
546 }
547
548 LOGFONTW *
549 hb_uniscribe_font_get_logfontw (hb_font_t *font)
550 {
551 if (unlikely (!hb_uniscribe_shaper_font_data_ensure (font))) return NULL;
552 hb_uniscribe_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font);
553 return &font_data->log_font;
554 }
555
556 HFONT
557 hb_uniscribe_font_get_hfont (hb_font_t *font)
558 {
559 if (unlikely (!hb_uniscribe_shaper_font_data_ensure (font))) return NULL;
560 hb_uniscribe_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font);
561 return font_data->hfont;
562 }
563
564
565 /*
566 * shaper shape_plan data
567 */
568
569 struct hb_uniscribe_shaper_shape_plan_data_t {};
570
571 hb_uniscribe_shaper_shape_plan_data_t *
572 _hb_uniscribe_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED,
573 const hb_feature_t *user_features HB_UNUSED,
574 unsigned int num_user_features HB_UNUSED)
575 {
576 return (hb_uniscribe_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
577 }
578
579 void
580 _hb_uniscribe_shaper_shape_plan_data_destroy (hb_uniscribe_shaper_shape_plan_data_t *data HB_UNUSED)
581 {
582 }
583
584
585 /*
586 * shaper
587 */
588
589
590 hb_bool_t
591 _hb_uniscribe_shape (hb_shape_plan_t *shape_plan,
592 hb_font_t *font,
593 hb_buffer_t *buffer,
594 const hb_feature_t *features,
595 unsigned int num_features)
596 {
597 hb_face_t *face = font->face;
598 hb_uniscribe_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
599 hb_uniscribe_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font);
600 hb_uniscribe_shaper_funcs_t *funcs = face_data->funcs;
601
602 /*
603 * Set up features.
604 */
605 hb_auto_array_t<OPENTYPE_FEATURE_RECORD> feature_records;
606 hb_auto_array_t<range_record_t> range_records;
607 if (num_features)
608 {
609 /* Sort features by start/end events. */
610 hb_auto_array_t<feature_event_t> feature_events;
611 for (unsigned int i = 0; i < num_features; i++)
612 {
613 active_feature_t feature;
614 feature.rec.tagFeature = hb_uint32_swap (features[i].tag);
615 feature.rec.lParameter = features[i].value;
616 feature.order = i;
617
618 feature_event_t *event;
619
620 event = feature_events.push ();
621 if (unlikely (!event))
622 goto fail_features;
623 event->index = features[i].start;
624 event->start = true;
625 event->feature = feature;
626
627 event = feature_events.push ();
628 if (unlikely (!event))
629 goto fail_features;
630 event->index = features[i].end;
631 event->start = false;
632 event->feature = feature;
633 }
634 feature_events.sort ();
635 /* Add a strategic final event. */
636 {
637 active_feature_t feature;
638 feature.rec.tagFeature = 0;
639 feature.rec.lParameter = 0;
640 feature.order = num_features + 1;
641
642 feature_event_t *event = feature_events.push ();
643 if (unlikely (!event))
644 goto fail_features;
645 event->index = 0; /* This value does magic. */
646 event->start = false;
647 event->feature = feature;
648 }
649
650 /* Scan events and save features for each range. */
651 hb_auto_array_t<active_feature_t> active_features;
652 unsigned int last_index = 0;
653 for (unsigned int i = 0; i < feature_events.len; i++)
654 {
655 feature_event_t *event = &feature_events[i];
656
657 if (event->index != last_index)
658 {
659 /* Save a snapshot of active features and the range. */
660 range_record_t *range = range_records.push ();
661 if (unlikely (!range))
662 goto fail_features;
663
664 unsigned int offset = feature_records.len;
665
666 active_features.sort ();
667 for (unsigned int j = 0; j < active_features.len; j++)
668 {
669 if (!j || active_features[j].rec.tagFeature != feature_records[feature_records.len - 1].tagFeature)
670 {
671 OPENTYPE_FEATURE_RECORD *feature = feature_records.push ();
672 if (unlikely (!feature))
673 goto fail_features;
674 *feature = active_features[j].rec;
675 }
676 else
677 {
678 /* Overrides value for existing feature. */
679 feature_records[feature_records.len - 1].lParameter = active_features[j].rec.lParameter;
680 }
681 }
682
683 /* Will convert to pointer after all is ready, since feature_records.array
684 * may move as we grow it. */
685 range->props.potfRecords = reinterpret_cast<OPENTYPE_FEATURE_RECORD *> (offset);
686 range->props.cotfRecords = feature_records.len - offset;
687 range->index_first = last_index;
688 range->index_last = event->index - 1;
689
690 last_index = event->index;
691 }
692
693 if (event->start) {
694 active_feature_t *feature = active_features.push ();
695 if (unlikely (!feature))
696 goto fail_features;
697 *feature = event->feature;
698 } else {
699 active_feature_t *feature = active_features.find (&event->feature);
700 if (feature)
701 active_features.remove (feature - active_features.array);
702 }
703 }
704
705 if (!range_records.len) /* No active feature found. */
706 goto fail_features;
707
708 /* Fixup the pointers. */
709 for (unsigned int i = 0; i < range_records.len; i++)
710 {
711 range_record_t *range = &range_records[i];
712 range->props.potfRecords = feature_records.array + reinterpret_cast<uintptr_t> (range->props.potfRecords);
713 }
714 }
715 else
716 {
717 fail_features:
718 num_features = 0;
719 }
720
721 #define FAIL(...) \
722 HB_STMT_START { \
723 DEBUG_MSG (UNISCRIBE, NULL, __VA_ARGS__); \
724 return false; \
725 } HB_STMT_END;
726
727 HRESULT hr;
728
729 retry:
730
731 unsigned int scratch_size;
732 hb_buffer_t::scratch_buffer_t *scratch = buffer->get_scratch_buffer (&scratch_size);
733
734 #define ALLOCATE_ARRAY(Type, name, len) \
735 Type *name = (Type *) scratch; \
736 { \
737 unsigned int _consumed = DIV_CEIL ((len) * sizeof (Type), sizeof (*scratch)); \
738 assert (_consumed <= scratch_size); \
739 scratch += _consumed; \
740 scratch_size -= _consumed; \
741 }
742
743 #define utf16_index() var1.u32
744
745 ALLOCATE_ARRAY (WCHAR, pchars, buffer->len * 2);
746
747 unsigned int chars_len = 0;
748 for (unsigned int i = 0; i < buffer->len; i++)
749 {
750 hb_codepoint_t c = buffer->info[i].codepoint;
751 buffer->info[i].utf16_index() = chars_len;
752 if (likely (c < 0x10000))
753 pchars[chars_len++] = c;
754 else if (unlikely (c >= 0x110000))
755 pchars[chars_len++] = 0xFFFD;
756 else {
757 pchars[chars_len++] = 0xD800 + ((c - 0x10000) >> 10);
758 pchars[chars_len++] = 0xDC00 + ((c - 0x10000) & ((1 << 10) - 1));
759 }
760 }
761
762 ALLOCATE_ARRAY (WORD, log_clusters, chars_len);
763 ALLOCATE_ARRAY (SCRIPT_CHARPROP, char_props, chars_len);
764
765 if (num_features)
766 {
767 /* Need log_clusters to assign features. */
768 chars_len = 0;
769 for (unsigned int i = 0; i < buffer->len; i++)
770 {
771 hb_codepoint_t c = buffer->info[i].codepoint;
772 unsigned int cluster = buffer->info[i].cluster;
773 log_clusters[chars_len++] = cluster;
774 if (c >= 0x10000 && c < 0x110000)
775 log_clusters[chars_len++] = cluster; /* Surrogates. */
776 }
777 }
778
779 /* The -2 in the following is to compensate for possible
780 * alignment needed after the WORD array. sizeof(WORD) == 2. */
781 unsigned int glyphs_size = (scratch_size * sizeof (int) - 2)
782 / (sizeof (WORD) +
783 sizeof (SCRIPT_GLYPHPROP) +
784 sizeof (int) +
785 sizeof (GOFFSET) +
786 sizeof (uint32_t));
787
788 ALLOCATE_ARRAY (WORD, glyphs, glyphs_size);
789 ALLOCATE_ARRAY (SCRIPT_GLYPHPROP, glyph_props, glyphs_size);
790 ALLOCATE_ARRAY (int, advances, glyphs_size);
791 ALLOCATE_ARRAY (GOFFSET, offsets, glyphs_size);
792 ALLOCATE_ARRAY (uint32_t, vis_clusters, glyphs_size);
793
794 /* Note:
795 * We can't touch the contents of glyph_props. Our fallback
796 * implementations of Shape and Place functions use that buffer
797 * by casting it to a different type. It works because they
798 * both agree about it, but if we want to access it here we
799 * need address that issue first.
800 */
801
802 #undef ALLOCATE_ARRAY
803
804 #define MAX_ITEMS 256
805
806 SCRIPT_ITEM items[MAX_ITEMS + 1];
807 SCRIPT_CONTROL bidi_control = {0};
808 SCRIPT_STATE bidi_state = {0};
809 ULONG script_tags[MAX_ITEMS];
810 int item_count;
811
812 /* MinGW32 doesn't define fMergeNeutralItems, so we bruteforce */
813 //bidi_control.fMergeNeutralItems = true;
814 *(uint32_t*)&bidi_control |= 1<<24;
815
816 bidi_state.uBidiLevel = HB_DIRECTION_IS_FORWARD (buffer->props.direction) ? 0 : 1;
817 bidi_state.fOverrideDirection = 1;
818
819 hr = funcs->ScriptItemizeOpenType (pchars,
820 chars_len,
821 MAX_ITEMS,
822 &bidi_control,
823 &bidi_state,
824 items,
825 script_tags,
826 &item_count);
827 if (unlikely (FAILED (hr)))
828 FAIL ("ScriptItemizeOpenType() failed: 0x%08xL", hr);
829
830 #undef MAX_ITEMS
831
832 OPENTYPE_TAG language_tag = hb_uint32_swap (hb_ot_tag_from_language (buffer->props.language));
833 hb_auto_array_t<TEXTRANGE_PROPERTIES*> range_properties;
834 hb_auto_array_t<int> range_char_counts;
835
836 unsigned int glyphs_offset = 0;
837 unsigned int glyphs_len;
838 bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction);
839 for (unsigned int i = 0; i < item_count; i++)
840 {
841 unsigned int chars_offset = items[i].iCharPos;
842 unsigned int item_chars_len = items[i + 1].iCharPos - chars_offset;
843
844 if (num_features)
845 {
846 range_properties.shrink (0);
847 range_char_counts.shrink (0);
848
849 range_record_t *last_range = &range_records[0];
850
851 for (unsigned int k = chars_offset; k < chars_offset + item_chars_len; k++)
852 {
853 range_record_t *range = last_range;
854 while (log_clusters[k] < range->index_first)
855 range--;
856 while (log_clusters[k] > range->index_last)
857 range++;
858 if (!range_properties.len ||
859 &range->props != range_properties[range_properties.len - 1])
860 {
861 TEXTRANGE_PROPERTIES **props = range_properties.push ();
862 int *c = range_char_counts.push ();
863 if (unlikely (!props || !c))
864 {
865 range_properties.shrink (0);
866 range_char_counts.shrink (0);
867 break;
868 }
869 *props = &range->props;
870 *c = 1;
871 }
872 else
873 {
874 range_char_counts[range_char_counts.len - 1]++;
875 }
876
877 last_range = range;
878 }
879 }
880
881 /* Asking for glyphs in logical order circumvents at least
882 * one bug in Uniscribe. */
883 items[i].a.fLogicalOrder = true;
884
885 retry_shape:
886 hr = funcs->ScriptShapeOpenType (font_data->hdc,
887 &font_data->script_cache,
888 &items[i].a,
889 script_tags[i],
890 language_tag,
891 range_char_counts.array,
892 range_properties.array,
893 range_properties.len,
894 pchars + chars_offset,
895 item_chars_len,
896 glyphs_size - glyphs_offset,
897 /* out */
898 log_clusters + chars_offset,
899 char_props + chars_offset,
900 glyphs + glyphs_offset,
901 glyph_props + glyphs_offset,
902 (int *) &glyphs_len);
903
904 if (unlikely (items[i].a.fNoGlyphIndex))
905 FAIL ("ScriptShapeOpenType() set fNoGlyphIndex");
906 if (unlikely (hr == E_OUTOFMEMORY))
907 {
908 buffer->ensure (buffer->allocated * 2);
909 if (buffer->in_error)
910 FAIL ("Buffer resize failed");
911 goto retry;
912 }
913 if (unlikely (hr == USP_E_SCRIPT_NOT_IN_FONT))
914 {
915 if (items[i].a.eScript == SCRIPT_UNDEFINED)
916 FAIL ("ScriptShapeOpenType() failed: Font doesn't support script");
917 items[i].a.eScript = SCRIPT_UNDEFINED;
918 goto retry_shape;
919 }
920 if (unlikely (FAILED (hr)))
921 {
922 FAIL ("ScriptShapeOpenType() failed: 0x%08xL", hr);
923 }
924
925 for (unsigned int j = chars_offset; j < chars_offset + item_chars_len; j++)
926 log_clusters[j] += glyphs_offset;
927
928 hr = funcs->ScriptPlaceOpenType (font_data->hdc,
929 &font_data->script_cache,
930 &items[i].a,
931 script_tags[i],
932 language_tag,
933 range_char_counts.array,
934 range_properties.array,
935 range_properties.len,
936 pchars + chars_offset,
937 log_clusters + chars_offset,
938 char_props + chars_offset,
939 item_chars_len,
940 glyphs + glyphs_offset,
941 glyph_props + glyphs_offset,
942 glyphs_len,
943 /* out */
944 advances + glyphs_offset,
945 offsets + glyphs_offset,
946 NULL);
947 if (unlikely (FAILED (hr)))
948 FAIL ("ScriptPlaceOpenType() failed: 0x%08xL", hr);
949
950 if (DEBUG_ENABLED (UNISCRIBE))
951 fprintf (stderr, "Item %d RTL %d LayoutRTL %d LogicalOrder %d ScriptTag %c%c%c%c\n",
952 i,
953 items[i].a.fRTL,
954 items[i].a.fLayoutRTL,
955 items[i].a.fLogicalOrder,
956 HB_UNTAG (hb_uint32_swap (script_tags[i])));
957
958 glyphs_offset += glyphs_len;
959 }
960 glyphs_len = glyphs_offset;
961
962 /* Ok, we've got everything we need, now compose output buffer,
963 * very, *very*, carefully! */
964
965 /* Calculate visual-clusters. That's what we ship. */
966 for (unsigned int i = 0; i < glyphs_len; i++)
967 vis_clusters[i] = -1;
968 for (unsigned int i = 0; i < buffer->len; i++) {
969 uint32_t *p = &vis_clusters[log_clusters[buffer->info[i].utf16_index()]];
970 *p = MIN (*p, buffer->info[i].cluster);
971 }
972 for (unsigned int i = 1; i < glyphs_len; i++)
973 if (vis_clusters[i] == -1)
974 vis_clusters[i] = vis_clusters[i - 1];
975
976 #undef utf16_index
977
978 buffer->ensure (glyphs_len);
979 if (buffer->in_error)
980 FAIL ("Buffer in error");
981
982 #undef FAIL
983
984 /* Set glyph infos */
985 buffer->len = 0;
986 for (unsigned int i = 0; i < glyphs_len; i++)
987 {
988 hb_glyph_info_t *info = &buffer->info[buffer->len++];
989
990 info->codepoint = glyphs[i];
991 info->cluster = vis_clusters[i];
992
993 /* The rest is crap. Let's store position info there for now. */
994 info->mask = advances[i];
995 info->var1.u32 = offsets[i].du;
996 info->var2.u32 = offsets[i].dv;
997 }
998
999 /* Set glyph positions */
1000 buffer->clear_positions ();
1001 for (unsigned int i = 0; i < glyphs_len; i++)
1002 {
1003 hb_glyph_info_t *info = &buffer->info[i];
1004 hb_glyph_position_t *pos = &buffer->pos[i];
1005
1006 /* TODO vertical */
1007 pos->x_advance = info->mask;
1008 pos->x_offset = backward ? -info->var1.u32 : info->var1.u32;
1009 pos->y_offset = info->var2.u32;
1010 }
1011
1012 if (backward)
1013 hb_buffer_reverse (buffer);
1014
1015 /* Wow, done! */
1016 return true;
1017 }
1018
1019

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