2 * Copyright © 2015 Mozilla Foundation.
3 * Copyright © 2015 Google, Inc.
5 * This is part of HarfBuzz, a text shaping library.
7 * Permission is hereby granted, without written agreement and without
8 * license or royalty fees, to use, copy, modify, and distribute this
9 * software and its documentation for any purpose, provided that the
10 * above copyright notice and the following two paragraphs appear in
11 * all copies of this software.
13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
25 * Mozilla Author(s): Jonathan Kew
26 * Google Author(s): Behdad Esfahbod
29 #include "hb-ot-shape-complex-use-private.hh"
30 #include "hb-ot-shape-complex-arabic-private.hh"
32 /* buffer var allocations */
33 #define use_category() complex_var_u8_0()
37 * Universal Shaping Engine.
38 * https://www.microsoft.com/typography/OpenTypeDev/USE/intro.htm
46 * These features are applied all at once, before reordering.
48 HB_TAG('r','k','r','f'),
49 HB_TAG('a','b','v','f'),
50 HB_TAG('b','l','w','f'),
51 HB_TAG('h','a','l','f'),
52 HB_TAG('p','s','t','f'),
53 HB_TAG('v','a','t','u'),
54 HB_TAG('c','j','c','t'),
59 HB_TAG('i','s','o','l'),
60 HB_TAG('i','n','i','t'),
61 HB_TAG('m','e','d','i'),
62 HB_TAG('f','i','n','a'),
63 /* The spec doesn't specify these but we apply anyway, since our Arabic shaper
64 * does. These are only used in Syriac spec. */
65 HB_TAG('m','e','d','2'),
66 HB_TAG('f','i','n','2'),
67 HB_TAG('f','i','n','3'),
69 /* Same order as arabic_features. Don't need Syriac stuff.*/
82 * These features are applied all at once, after reordering.
84 HB_TAG('a','b','v','s'),
85 HB_TAG('b','l','w','s'),
86 HB_TAG('h','a','l','n'),
87 HB_TAG('p','r','e','s'),
88 HB_TAG('p','s','t','s'),
89 /* Positioning features, though we don't care about the types. */
90 HB_TAG('d','i','s','t'),
91 HB_TAG('a','b','v','m'),
92 HB_TAG('b','l','w','m'),
96 setup_syllables (const hb_ot_shape_plan_t *plan,
100 clear_substitution_flags (const hb_ot_shape_plan_t *plan,
102 hb_buffer_t *buffer);
104 record_rphf (const hb_ot_shape_plan_t *plan,
106 hb_buffer_t *buffer);
108 record_pref (const hb_ot_shape_plan_t *plan,
110 hb_buffer_t *buffer);
112 reorder (const hb_ot_shape_plan_t *plan,
114 hb_buffer_t *buffer);
117 collect_features_use (hb_ot_shape_planner_t *plan)
119 hb_ot_map_builder_t *map = &plan->map;
121 /* Do this before any lookups have been applied. */
122 map->add_gsub_pause (setup_syllables);
124 /* "Default glyph pre-processing group" */
125 map->add_global_bool_feature (HB_TAG('l','o','c','l'));
126 map->add_global_bool_feature (HB_TAG('c','c','m','p'));
127 map->add_global_bool_feature (HB_TAG('n','u','k','t'));
128 map->add_global_bool_feature (HB_TAG('a','k','h','n'));
130 /* "Reordering group" */
131 map->add_gsub_pause (clear_substitution_flags);
132 map->add_feature (HB_TAG('r','p','h','f'), 1, F_MANUAL_ZWJ);
133 map->add_gsub_pause (record_rphf);
134 map->add_gsub_pause (clear_substitution_flags);
135 map->add_feature (HB_TAG('p','r','e','f'), 1, F_GLOBAL | F_MANUAL_ZWJ);
136 map->add_gsub_pause (record_pref);
138 /* "Orthographic unit shaping group" */
139 for (unsigned int i = 0; i < ARRAY_LENGTH (basic_features); i++)
140 map->add_feature (basic_features[i], 1, F_GLOBAL | F_MANUAL_ZWJ);
142 map->add_gsub_pause (reorder);
144 /* "Topographical features" */
145 for (unsigned int i = 0; i < ARRAY_LENGTH (arabic_features); i++)
146 map->add_feature (arabic_features[i], 1, F_NONE);
147 map->add_gsub_pause (NULL);
149 /* "Standard typographic presentation" and "Positional feature application" */
150 for (unsigned int i = 0; i < ARRAY_LENGTH (other_features); i++)
151 map->add_feature (other_features[i], 1, F_GLOBAL | F_MANUAL_ZWJ);
154 struct use_shape_plan_t
160 arabic_shape_plan_t *arabic_plan;
164 has_arabic_joining (hb_script_t script)
166 /* List of scripts that have data in arabic-table. */
167 switch ((int) script)
169 /* Unicode-1.1 additions */
170 case HB_SCRIPT_ARABIC:
172 /* Unicode-3.0 additions */
173 case HB_SCRIPT_MONGOLIAN:
174 case HB_SCRIPT_SYRIAC:
176 /* Unicode-5.0 additions */
178 case HB_SCRIPT_PHAGS_PA:
180 /* Unicode-6.0 additions */
181 case HB_SCRIPT_MANDAIC:
183 /* Unicode-7.0 additions */
184 case HB_SCRIPT_MANICHAEAN:
185 case HB_SCRIPT_PSALTER_PAHLAVI:
195 data_create_use (const hb_ot_shape_plan_t *plan)
197 use_shape_plan_t *use_plan = (use_shape_plan_t *) calloc (1, sizeof (use_shape_plan_t));
198 if (unlikely (!use_plan))
201 use_plan->rphf_mask = plan->map.get_1_mask (HB_TAG('r','p','h','f'));
203 if (has_arabic_joining (plan->props.script))
205 use_plan->arabic_plan = (arabic_shape_plan_t *) data_create_arabic (plan);
206 if (unlikely (!use_plan->arabic_plan))
217 data_destroy_use (void *data)
219 use_shape_plan_t *use_plan = (use_shape_plan_t *) data;
221 if (use_plan->arabic_plan)
222 data_destroy_arabic (use_plan->arabic_plan);
227 enum syllable_type_t {
229 virama_terminated_cluster,
232 number_joiner_terminated_cluster,
238 #include "hb-ot-shape-complex-use-machine.hh"
242 setup_masks_use (const hb_ot_shape_plan_t *plan,
244 hb_font_t *font HB_UNUSED)
246 const use_shape_plan_t *use_plan = (const use_shape_plan_t *) plan->data;
248 /* Do this before allocating use_category(). */
249 if (use_plan->arabic_plan)
251 setup_masks_arabic_plan (use_plan->arabic_plan, buffer, plan->props.script);
254 HB_BUFFER_ALLOCATE_VAR (buffer, use_category);
256 /* We cannot setup masks here. We save information about characters
257 * and setup masks later on in a pause-callback. */
259 unsigned int count = buffer->len;
260 hb_glyph_info_t *info = buffer->info;
261 for (unsigned int i = 0; i < count; i++)
262 info[i].use_category() = hb_use_get_categories (info[i].codepoint);
266 setup_rphf_mask (const hb_ot_shape_plan_t *plan,
269 const use_shape_plan_t *use_plan = (const use_shape_plan_t *) plan->data;
271 hb_mask_t mask = use_plan->rphf_mask;
274 hb_glyph_info_t *info = buffer->info;
276 foreach_syllable (buffer, start, end)
278 unsigned int limit = info[start].use_category() == USE_R ? 1 : MIN (3u, end - start);
279 for (unsigned int i = start; i < start + limit; i++)
280 info[i].mask |= mask;
285 setup_topographical_masks (const hb_ot_shape_plan_t *plan,
288 const use_shape_plan_t *use_plan = (const use_shape_plan_t *) plan->data;
289 if (use_plan->arabic_plan)
292 ASSERT_STATIC (INIT < 4 && ISOL < 4 && MEDI < 4 && FINA < 4);
293 hb_mask_t masks[4], all_masks = 0;
294 for (unsigned int i = 0; i < 4; i++)
296 masks[i] = plan->map.get_1_mask (arabic_features[i]);
297 if (masks[i] == plan->map.get_global_mask ())
299 all_masks |= masks[i];
303 hb_mask_t other_masks = ~all_masks;
305 unsigned int last_start = 0;
306 joining_form_t last_form = _NONE;
307 hb_glyph_info_t *info = buffer->info;
308 foreach_syllable (buffer, start, end)
310 syllable_type_t syllable_type = (syllable_type_t) (info[start].syllable() & 0x0F);
311 switch (syllable_type)
313 case independent_cluster:
315 /* These don't join. Nothing to do. */
319 case virama_terminated_cluster:
320 case consonant_cluster:
322 case number_joiner_terminated_cluster:
323 case numeral_cluster:
326 bool join = last_form == FINA || last_form == ISOL;
330 /* Fixup previous syllable's form. */
331 last_form = last_form == FINA ? MEDI : INIT;
332 for (unsigned int i = last_start; i < start; i++)
333 info[i].mask = (info[i].mask & other_masks) | masks[last_form];
336 /* Form for this syllable. */
337 last_form = join ? FINA : ISOL;
338 for (unsigned int i = start; i < end; i++)
339 info[i].mask = (info[i].mask & other_masks) | masks[last_form];
349 setup_syllables (const hb_ot_shape_plan_t *plan,
350 hb_font_t *font HB_UNUSED,
353 find_syllables (buffer);
354 setup_rphf_mask (plan, buffer);
355 setup_topographical_masks (plan, buffer);
359 clear_substitution_flags (const hb_ot_shape_plan_t *plan,
360 hb_font_t *font HB_UNUSED,
363 hb_glyph_info_t *info = buffer->info;
364 unsigned int count = buffer->len;
365 for (unsigned int i = 0; i < count; i++)
366 _hb_glyph_info_clear_substituted (&info[i]);
370 record_rphf (const hb_ot_shape_plan_t *plan,
374 const use_shape_plan_t *use_plan = (const use_shape_plan_t *) plan->data;
376 hb_mask_t mask = use_plan->rphf_mask;
378 hb_glyph_info_t *info = buffer->info;
380 foreach_syllable (buffer, start, end)
382 /* Mark a substituted repha as USE_R. */
383 for (unsigned int i = start; i < end && (info[i].mask & mask); i++)
384 if (_hb_glyph_info_substituted (&info[i]))
386 info[i].use_category() = USE_R;
393 record_pref (const hb_ot_shape_plan_t *plan,
397 hb_glyph_info_t *info = buffer->info;
399 foreach_syllable (buffer, start, end)
401 /* Mark a substituted pref as VPre, as they behave the same way. */
402 for (unsigned int i = start; i < end; i++)
403 if (_hb_glyph_info_substituted (&info[i]))
405 info[i].use_category() = USE_VPre;
412 is_halant (const hb_glyph_info_t &info)
414 return info.use_category() == USE_H && !_hb_glyph_info_ligated (&info);
418 reorder_syllable (hb_buffer_t *buffer, unsigned int start, unsigned int end)
420 syllable_type_t syllable_type = (syllable_type_t) (buffer->info[start].syllable() & 0x0F);
421 /* Only a few syllable types need reordering. */
422 if (unlikely (!(FLAG_SAFE (syllable_type) &
423 (FLAG (virama_terminated_cluster) |
424 FLAG (consonant_cluster) |
425 FLAG (vowel_cluster) |
426 FLAG (broken_cluster) |
430 hb_glyph_info_t *info = buffer->info;
432 #define BASE_FLAGS (FLAG (USE_B) | FLAG (USE_GB) | FLAG (USE_IV))
434 /* Move things forward. */
435 if (info[start].use_category() == USE_R && end - start > 1)
437 /* Got a repha. Reorder it to after first base, before first halant. */
438 for (unsigned int i = start + 1; i < end; i++)
439 if ((FLAG_UNSAFE (info[i].use_category()) & (BASE_FLAGS)) || is_halant (info[i]))
441 /* If we hit a halant, move before it; otherwise it's a base: move to it's
442 * place, and shift things in between backward. */
444 if (is_halant (info[i]))
447 buffer->merge_clusters (start, i + 1);
448 hb_glyph_info_t t = info[start];
449 memmove (&info[start], &info[start + 1], (i - start) * sizeof (info[0]));
456 /* Move things back. */
457 unsigned int j = end;
458 for (unsigned int i = start; i < end; i++)
460 uint32_t flag = FLAG_UNSAFE (info[i].use_category());
461 if ((flag & (BASE_FLAGS)) || is_halant (info[i]))
463 /* If we hit a halant, move after it; otherwise it's a base: move to it's
464 * place, and shift things in between backward. */
465 if (is_halant (info[i]))
470 else if (((flag) & (FLAG (USE_VPre) | FLAG (USE_VMPre))) &&
471 /* Only move the first component of a MultipleSubst. */
472 0 == _hb_glyph_info_get_lig_comp (&info[i]) &&
475 buffer->merge_clusters (j, i + 1);
476 hb_glyph_info_t t = info[i];
477 memmove (&info[j + 1], &info[j], (i - j) * sizeof (info[0]));
484 insert_dotted_circles (const hb_ot_shape_plan_t *plan HB_UNUSED,
488 /* Note: This loop is extra overhead, but should not be measurable. */
489 bool has_broken_syllables = false;
490 unsigned int count = buffer->len;
491 hb_glyph_info_t *info = buffer->info;
492 for (unsigned int i = 0; i < count; i++)
493 if ((info[i].syllable() & 0x0F) == broken_cluster)
495 has_broken_syllables = true;
498 if (likely (!has_broken_syllables))
501 hb_glyph_info_t dottedcircle = {0};
502 if (!font->get_nominal_glyph (0x25CCu, &dottedcircle.codepoint))
504 dottedcircle.use_category() = hb_use_get_categories (0x25CC);
506 buffer->clear_output ();
509 unsigned int last_syllable = 0;
510 while (buffer->idx < buffer->len && !buffer->in_error)
512 unsigned int syllable = buffer->cur().syllable();
513 syllable_type_t syllable_type = (syllable_type_t) (syllable & 0x0F);
514 if (unlikely (last_syllable != syllable && syllable_type == broken_cluster))
516 last_syllable = syllable;
518 hb_glyph_info_t ginfo = dottedcircle;
519 ginfo.cluster = buffer->cur().cluster;
520 ginfo.mask = buffer->cur().mask;
521 ginfo.syllable() = buffer->cur().syllable();
522 /* TODO Set glyph_props? */
524 /* Insert dottedcircle after possible Repha. */
525 while (buffer->idx < buffer->len && !buffer->in_error &&
526 last_syllable == buffer->cur().syllable() &&
527 buffer->cur().use_category() == USE_R)
528 buffer->next_glyph ();
530 buffer->output_info (ginfo);
533 buffer->next_glyph ();
536 buffer->swap_buffers ();
540 reorder (const hb_ot_shape_plan_t *plan,
544 insert_dotted_circles (plan, font, buffer);
546 hb_glyph_info_t *info = buffer->info;
548 foreach_syllable (buffer, start, end)
549 reorder_syllable (buffer, start, end);
551 /* Zero syllables now... */
552 unsigned int count = buffer->len;
553 for (unsigned int i = 0; i < count; i++)
554 info[i].syllable() = 0;
556 HB_BUFFER_DEALLOCATE_VAR (buffer, use_category);
560 compose_use (const hb_ot_shape_normalize_context_t *c,
565 /* Avoid recomposing split matras. */
566 if (HB_UNICODE_GENERAL_CATEGORY_IS_MARK (c->unicode->general_category (a)))
569 return (bool)c->unicode->compose (a, b, ab);
573 const hb_ot_complex_shaper_t _hb_ot_complex_shaper_use =
576 collect_features_use,
577 NULL, /* override_features */
580 NULL, /* preprocess_text */
581 NULL, /* postprocess_glyphs */
582 HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT,
583 NULL, /* decompose */
586 HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY,
587 false, /* fallback_position */