2 * Copyright © 2009,2010 Red Hat, Inc.
3 * Copyright © 2010,2011,2012 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 * Red Hat Author(s): Behdad Esfahbod
26 * Google Author(s): Behdad Esfahbod
30 #define hb_ot_shaper_face_data_t hb_ot_layout_t
31 #define hb_ot_shaper_shape_plan_data_t hb_ot_shape_plan_t
32 #include "hb-shaper-impl-private.hh"
34 #include "hb-ot-shape-private.hh"
35 #include "hb-ot-shape-complex-private.hh"
36 #include "hb-ot-shape-fallback-private.hh"
37 #include "hb-ot-shape-normalize-private.hh"
39 #include "hb-ot-layout-private.hh"
40 #include "hb-unicode-private.hh"
41 #include "hb-set-private.hh"
44 static hb_tag_t common_features[] = {
45 HB_TAG('c','c','m','p'),
46 HB_TAG('l','o','c','l'),
47 HB_TAG('m','a','r','k'),
48 HB_TAG('m','k','m','k'),
49 HB_TAG('r','l','i','g'),
53 static hb_tag_t horizontal_features[] = {
54 HB_TAG('c','a','l','t'),
55 HB_TAG('c','l','i','g'),
56 HB_TAG('c','u','r','s'),
57 HB_TAG('k','e','r','n'),
58 HB_TAG('l','i','g','a'),
59 HB_TAG('r','c','l','t'),
65 hb_ot_shape_collect_features (hb_ot_shape_planner_t *planner,
66 const hb_segment_properties_t *props,
67 const hb_feature_t *user_features,
68 unsigned int num_user_features)
70 hb_ot_map_builder_t *map = &planner->map;
72 switch (props->direction) {
73 case HB_DIRECTION_LTR:
74 map->add_global_bool_feature (HB_TAG ('l','t','r','a'));
75 map->add_global_bool_feature (HB_TAG ('l','t','r','m'));
77 case HB_DIRECTION_RTL:
78 map->add_global_bool_feature (HB_TAG ('r','t','l','a'));
79 map->add_feature (HB_TAG ('r','t','l','m'), 1, F_NONE);
81 case HB_DIRECTION_TTB:
82 case HB_DIRECTION_BTT:
83 case HB_DIRECTION_INVALID:
88 map->add_feature (HB_TAG ('f','r','a','c'), 1, F_NONE);
89 map->add_feature (HB_TAG ('n','u','m','r'), 1, F_NONE);
90 map->add_feature (HB_TAG ('d','n','o','m'), 1, F_NONE);
92 if (planner->shaper->collect_features)
93 planner->shaper->collect_features (planner);
95 for (unsigned int i = 0; i < ARRAY_LENGTH (common_features); i++)
96 map->add_global_bool_feature (common_features[i]);
98 if (HB_DIRECTION_IS_HORIZONTAL (props->direction))
99 for (unsigned int i = 0; i < ARRAY_LENGTH (horizontal_features); i++)
100 map->add_feature (horizontal_features[i], 1, F_GLOBAL |
101 (horizontal_features[i] == HB_TAG('k','e','r','n') ?
102 F_HAS_FALLBACK : F_NONE));
105 /* We really want to find a 'vert' feature if there's any in the font, no
106 * matter which script/langsys it is listed (or not) under.
107 * See various bugs referenced from:
108 * https://github.com/behdad/harfbuzz/issues/63 */
109 map->add_feature (HB_TAG ('v','e','r','t'), 1, F_GLOBAL | F_GLOBAL_SEARCH);
112 if (planner->shaper->override_features)
113 planner->shaper->override_features (planner);
115 for (unsigned int i = 0; i < num_user_features; i++) {
116 const hb_feature_t *feature = &user_features[i];
117 map->add_feature (feature->tag, feature->value,
118 (feature->start == 0 && feature->end == (unsigned int) -1) ?
128 hb_ot_shaper_face_data_t *
129 _hb_ot_shaper_face_data_create (hb_face_t *face)
131 return _hb_ot_layout_create (face);
135 _hb_ot_shaper_face_data_destroy (hb_ot_shaper_face_data_t *data)
137 _hb_ot_layout_destroy (data);
145 struct hb_ot_shaper_font_data_t {};
147 hb_ot_shaper_font_data_t *
148 _hb_ot_shaper_font_data_create (hb_font_t *font HB_UNUSED)
150 return (hb_ot_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED;
154 _hb_ot_shaper_font_data_destroy (hb_ot_shaper_font_data_t *data)
160 * shaper shape_plan data
163 hb_ot_shaper_shape_plan_data_t *
164 _hb_ot_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan,
165 const hb_feature_t *user_features,
166 unsigned int num_user_features)
168 hb_ot_shape_plan_t *plan = (hb_ot_shape_plan_t *) calloc (1, sizeof (hb_ot_shape_plan_t));
169 if (unlikely (!plan))
172 hb_ot_shape_planner_t planner (shape_plan);
174 planner.shaper = hb_ot_shape_complex_categorize (&planner);
176 hb_ot_shape_collect_features (&planner, &shape_plan->props, user_features, num_user_features);
178 planner.compile (*plan);
180 if (plan->shaper->data_create) {
181 plan->data = plan->shaper->data_create (plan);
182 if (unlikely (!plan->data))
190 _hb_ot_shaper_shape_plan_data_destroy (hb_ot_shaper_shape_plan_data_t *plan)
192 if (plan->shaper->data_destroy)
193 plan->shaper->data_destroy (const_cast<void *> (plan->data));
205 struct hb_ot_shape_context_t
207 hb_ot_shape_plan_t *plan;
211 const hb_feature_t *user_features;
212 unsigned int num_user_features;
214 /* Transient stuff */
215 hb_direction_t target_direction;
226 hb_set_unicode_props (hb_buffer_t *buffer)
228 unsigned int count = buffer->len;
229 hb_glyph_info_t *info = buffer->info;
230 for (unsigned int i = 0; i < count; i++)
231 _hb_glyph_info_set_unicode_props (&info[i], buffer);
235 hb_insert_dotted_circle (hb_buffer_t *buffer, hb_font_t *font)
237 if (!(buffer->flags & HB_BUFFER_FLAG_BOT) ||
238 buffer->context_len[0] ||
239 _hb_glyph_info_get_general_category (&buffer->info[0]) !=
240 HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)
243 if (!font->has_glyph (0x25CCu))
246 hb_glyph_info_t dottedcircle = {0};
247 dottedcircle.codepoint = 0x25CCu;
248 _hb_glyph_info_set_unicode_props (&dottedcircle, buffer);
250 buffer->clear_output ();
253 hb_glyph_info_t info = dottedcircle;
254 info.cluster = buffer->cur().cluster;
255 info.mask = buffer->cur().mask;
256 buffer->output_info (info);
257 while (buffer->idx < buffer->len && !buffer->in_error)
258 buffer->next_glyph ();
260 buffer->swap_buffers ();
264 hb_form_clusters (hb_buffer_t *buffer)
266 if (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_NON_ASCII) ||
267 buffer->cluster_level != HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES)
270 /* Loop duplicated in hb_ensure_native_direction(), and in _hb-coretext.cc */
271 unsigned int base = 0;
272 unsigned int count = buffer->len;
273 hb_glyph_info_t *info = buffer->info;
274 for (unsigned int i = 1; i < count; i++)
276 if (likely (!HB_UNICODE_GENERAL_CATEGORY_IS_MARK (_hb_glyph_info_get_general_category (&info[i])) &&
277 !_hb_glyph_info_is_joiner (&info[i])))
279 buffer->merge_clusters (base, i);
283 buffer->merge_clusters (base, count);
287 hb_ensure_native_direction (hb_buffer_t *buffer)
289 hb_direction_t direction = buffer->props.direction;
292 * The only BTT vertical script is Ogham, but it's not clear to me whether OpenType
293 * Ogham fonts are supposed to be implemented BTT or not. Need to research that
295 if ((HB_DIRECTION_IS_HORIZONTAL (direction) && direction != hb_script_get_horizontal_direction (buffer->props.script)) ||
296 (HB_DIRECTION_IS_VERTICAL (direction) && direction != HB_DIRECTION_TTB))
298 /* Same loop as hb_form_clusters().
299 * Since form_clusters() merged clusters already, we don't merge. */
300 unsigned int base = 0;
301 unsigned int count = buffer->len;
302 hb_glyph_info_t *info = buffer->info;
303 for (unsigned int i = 1; i < count; i++)
305 if (likely (!HB_UNICODE_GENERAL_CATEGORY_IS_MARK (_hb_glyph_info_get_general_category (&info[i]))))
307 if (buffer->cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS)
308 buffer->merge_clusters (base, i);
309 buffer->reverse_range (base, i);
314 if (buffer->cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS)
315 buffer->merge_clusters (base, count);
316 buffer->reverse_range (base, count);
320 buffer->props.direction = HB_DIRECTION_REVERSE (buffer->props.direction);
328 hb_ot_mirror_chars (hb_ot_shape_context_t *c)
330 if (HB_DIRECTION_IS_FORWARD (c->target_direction))
333 hb_buffer_t *buffer = c->buffer;
334 hb_unicode_funcs_t *unicode = buffer->unicode;
335 hb_mask_t rtlm_mask = c->plan->rtlm_mask;
337 unsigned int count = buffer->len;
338 hb_glyph_info_t *info = buffer->info;
339 for (unsigned int i = 0; i < count; i++) {
340 hb_codepoint_t codepoint = unicode->mirroring (info[i].codepoint);
341 if (likely (codepoint == info[i].codepoint || !c->font->has_glyph (codepoint)))
342 info[i].mask |= rtlm_mask;
344 info[i].codepoint = codepoint;
349 hb_ot_shape_setup_masks_fraction (hb_ot_shape_context_t *c)
351 if (!(c->buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_NON_ASCII) ||
355 hb_buffer_t *buffer = c->buffer;
357 /* TODO look in pre/post context text also. */
358 unsigned int count = buffer->len;
359 hb_glyph_info_t *info = buffer->info;
360 for (unsigned int i = 0; i < count; i++)
362 if (info[i].codepoint == 0x2044u) /* FRACTION SLASH */
364 unsigned int start = i, end = i + 1;
366 _hb_glyph_info_get_general_category (&info[start - 1]) ==
367 HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER)
369 while (end < count &&
370 _hb_glyph_info_get_general_category (&info[end]) ==
371 HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER)
374 for (unsigned int j = start; j < i; j++)
375 info[j].mask |= c->plan->numr_mask | c->plan->frac_mask;
376 info[i].mask |= c->plan->frac_mask;
377 for (unsigned int j = i + 1; j < end; j++)
378 info[j].mask |= c->plan->frac_mask | c->plan->dnom_mask;
386 hb_ot_shape_initialize_masks (hb_ot_shape_context_t *c)
388 hb_ot_map_t *map = &c->plan->map;
389 hb_buffer_t *buffer = c->buffer;
391 hb_mask_t global_mask = map->get_global_mask ();
392 buffer->reset_masks (global_mask);
396 hb_ot_shape_setup_masks (hb_ot_shape_context_t *c)
398 hb_ot_map_t *map = &c->plan->map;
399 hb_buffer_t *buffer = c->buffer;
401 hb_ot_shape_setup_masks_fraction (c);
403 if (c->plan->shaper->setup_masks)
404 c->plan->shaper->setup_masks (c->plan, buffer, c->font);
406 for (unsigned int i = 0; i < c->num_user_features; i++)
408 const hb_feature_t *feature = &c->user_features[i];
409 if (!(feature->start == 0 && feature->end == (unsigned int)-1)) {
411 hb_mask_t mask = map->get_mask (feature->tag, &shift);
412 buffer->set_masks (feature->value << shift, mask, feature->start, feature->end);
418 hb_ot_zero_width_default_ignorables (hb_ot_shape_context_t *c)
420 hb_buffer_t *buffer = c->buffer;
422 if (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_DEFAULT_IGNORABLES) ||
423 (buffer->flags & HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES))
426 unsigned int count = buffer->len;
427 hb_glyph_info_t *info = buffer->info;
428 hb_glyph_position_t *pos = buffer->pos;
430 for (i = 0; i < count; i++)
431 if (unlikely (_hb_glyph_info_is_default_ignorable (&info[i])))
432 pos[i].x_advance = pos[i].y_advance = pos[i].x_offset = pos[i].y_offset = 0;
436 hb_ot_hide_default_ignorables (hb_ot_shape_context_t *c)
438 hb_buffer_t *buffer = c->buffer;
440 if (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_DEFAULT_IGNORABLES) ||
441 (buffer->flags & HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES))
444 unsigned int count = buffer->len;
445 hb_glyph_info_t *info = buffer->info;
446 hb_glyph_position_t *pos = buffer->pos;
448 for (i = 0; i < count; i++)
450 if (unlikely (_hb_glyph_info_is_default_ignorable (&info[i])))
454 /* No default-ignorables found; return. */
458 hb_codepoint_t space;
459 if (c->font->get_nominal_glyph (' ', &space))
461 /* Replace default-ignorables with a zero-advance space glyph. */
462 for (/*continue*/; i < count; i++)
464 if (_hb_glyph_info_is_default_ignorable (&info[i]))
465 info[i].codepoint = space;
470 /* Merge clusters and delete default-ignorables.
471 * NOTE! We can't use out-buffer as we have positioning data. */
473 for (; i < count; i++)
475 if (_hb_glyph_info_is_default_ignorable (&info[i]))
478 * Same logic as buffer->delete_glyph(), but for in-place removal. */
480 unsigned int cluster = info[i].cluster;
481 if (i + 1 < count && cluster == info[i + 1].cluster)
482 continue; /* Cluster survives; do nothing. */
486 /* Merge cluster backward. */
487 if (cluster < info[j - 1].cluster)
489 unsigned int old_cluster = info[j - 1].cluster;
490 for (unsigned k = j; k && info[k - 1].cluster == old_cluster; k--)
491 info[k - 1].cluster = cluster;
497 buffer->merge_clusters (i, i + 2); /* Merge cluster forward. */
515 hb_ot_map_glyphs_fast (hb_buffer_t *buffer)
517 /* Normalization process sets up glyph_index(), we just copy it. */
518 unsigned int count = buffer->len;
519 hb_glyph_info_t *info = buffer->info;
520 for (unsigned int i = 0; i < count; i++)
521 info[i].codepoint = info[i].glyph_index();
523 buffer->content_type = HB_BUFFER_CONTENT_TYPE_GLYPHS;
527 hb_ot_substitute_default (hb_ot_shape_context_t *c)
529 hb_buffer_t *buffer = c->buffer;
531 hb_ot_shape_initialize_masks (c);
533 hb_ot_mirror_chars (c);
535 HB_BUFFER_ALLOCATE_VAR (buffer, glyph_index);
537 _hb_ot_shape_normalize (c->plan, buffer, c->font);
539 hb_ot_shape_setup_masks (c);
541 /* This is unfortunate to go here, but necessary... */
542 if (!hb_ot_layout_has_positioning (c->face))
543 _hb_ot_shape_fallback_position_recategorize_marks (c->plan, c->font, buffer);
545 hb_ot_map_glyphs_fast (buffer);
547 HB_BUFFER_DEALLOCATE_VAR (buffer, glyph_index);
551 hb_ot_substitute_complex (hb_ot_shape_context_t *c)
553 hb_buffer_t *buffer = c->buffer;
555 hb_ot_layout_substitute_start (c->font, buffer);
557 c->plan->substitute (c->font, buffer);
563 hb_ot_substitute (hb_ot_shape_context_t *c)
565 hb_ot_substitute_default (c);
567 _hb_buffer_allocate_gsubgpos_vars (c->buffer);
569 hb_ot_substitute_complex (c);
575 adjust_mark_offsets (hb_glyph_position_t *pos)
577 pos->x_offset -= pos->x_advance;
578 pos->y_offset -= pos->y_advance;
582 zero_mark_width (hb_glyph_position_t *pos)
589 zero_mark_widths_by_gdef (hb_buffer_t *buffer, bool adjust_offsets)
591 unsigned int count = buffer->len;
592 hb_glyph_info_t *info = buffer->info;
593 for (unsigned int i = 0; i < count; i++)
594 if (_hb_glyph_info_is_mark (&info[i]))
597 adjust_mark_offsets (&buffer->pos[i]);
598 zero_mark_width (&buffer->pos[i]);
603 hb_ot_position_default (hb_ot_shape_context_t *c)
605 hb_direction_t direction = c->buffer->props.direction;
606 unsigned int count = c->buffer->len;
607 hb_glyph_info_t *info = c->buffer->info;
608 hb_glyph_position_t *pos = c->buffer->pos;
610 if (HB_DIRECTION_IS_HORIZONTAL (direction))
612 for (unsigned int i = 0; i < count; i++)
613 pos[i].x_advance = c->font->get_glyph_h_advance (info[i].codepoint);
614 /* The nil glyph_h_origin() func returns 0, so no need to apply it. */
615 if (c->font->has_glyph_h_origin_func ())
616 for (unsigned int i = 0; i < count; i++)
617 c->font->subtract_glyph_h_origin (info[i].codepoint,
623 for (unsigned int i = 0; i < count; i++)
625 pos[i].y_advance = c->font->get_glyph_v_advance (info[i].codepoint);
626 c->font->subtract_glyph_v_origin (info[i].codepoint,
631 if (c->buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_SPACE_FALLBACK)
632 _hb_ot_shape_fallback_spaces (c->plan, c->font, c->buffer);
636 hb_ot_position_complex (hb_ot_shape_context_t *c)
638 hb_ot_layout_position_start (c->font, c->buffer);
641 unsigned int count = c->buffer->len;
642 bool has_positioning = (bool) hb_ot_layout_has_positioning (c->face);
644 /* If the font has no GPOS, AND, no fallback positioning will
645 * happen, AND, direction is forward, then when zeroing mark
646 * widths, we shift the mark with it, such that the mark
647 * is positioned hanging over the previous glyph. When
648 * direction is backward we don't shift and it will end up
649 * hanging over the next glyph after the final reordering.
650 * If fallback positinoing happens or GPOS is present, we don't
653 bool adjust_offsets_when_zeroing = !(has_positioning || c->plan->shaper->fallback_position ||
654 HB_DIRECTION_IS_BACKWARD (c->buffer->props.direction));
656 switch (c->plan->shaper->zero_width_marks)
658 case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY:
659 zero_mark_widths_by_gdef (c->buffer, adjust_offsets_when_zeroing);
663 case HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE:
664 case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE:
670 hb_glyph_info_t *info = c->buffer->info;
671 hb_glyph_position_t *pos = c->buffer->pos;
673 /* Change glyph origin to what GPOS expects (horizontal), apply GPOS, change it back. */
675 /* The nil glyph_h_origin() func returns 0, so no need to apply it. */
676 if (c->font->has_glyph_h_origin_func ())
677 for (unsigned int i = 0; i < count; i++)
678 c->font->add_glyph_h_origin (info[i].codepoint,
682 c->plan->position (c->font, c->buffer);
684 /* The nil glyph_h_origin() func returns 0, so no need to apply it. */
685 if (c->font->has_glyph_h_origin_func ())
686 for (unsigned int i = 0; i < count; i++)
687 c->font->subtract_glyph_h_origin (info[i].codepoint,
694 switch (c->plan->shaper->zero_width_marks)
696 case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE:
697 zero_mark_widths_by_gdef (c->buffer, adjust_offsets_when_zeroing);
701 case HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE:
702 case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY:
706 /* Finishing off GPOS has to follow a certain order. */
707 hb_ot_layout_position_finish_advances (c->font, c->buffer);
708 hb_ot_zero_width_default_ignorables (c);
709 hb_ot_layout_position_finish_offsets (c->font, c->buffer);
715 hb_ot_position (hb_ot_shape_context_t *c)
717 c->buffer->clear_positions ();
719 hb_ot_position_default (c);
721 hb_bool_t fallback = !hb_ot_position_complex (c);
723 if (fallback && c->plan->shaper->fallback_position)
724 _hb_ot_shape_fallback_position (c->plan, c->font, c->buffer);
726 if (HB_DIRECTION_IS_BACKWARD (c->buffer->props.direction))
727 hb_buffer_reverse (c->buffer);
729 /* Visual fallback goes here. */
732 _hb_ot_shape_fallback_kern (c->plan, c->font, c->buffer);
734 _hb_buffer_deallocate_gsubgpos_vars (c->buffer);
738 /* Pull it all together! */
741 hb_ot_shape_internal (hb_ot_shape_context_t *c)
743 c->buffer->deallocate_var_all ();
744 c->buffer->scratch_flags = HB_BUFFER_SCRATCH_FLAG_DEFAULT;
745 if (likely (!_hb_unsigned_int_mul_overflows (c->buffer->len, HB_BUFFER_MAX_EXPANSION_FACTOR)))
747 c->buffer->max_len = MAX (c->buffer->len * HB_BUFFER_MAX_EXPANSION_FACTOR,
748 (unsigned) HB_BUFFER_MAX_LEN_MIN);
751 /* Save the original direction, we use it later. */
752 c->target_direction = c->buffer->props.direction;
754 _hb_buffer_allocate_unicode_vars (c->buffer);
756 c->buffer->clear_output ();
758 hb_set_unicode_props (c->buffer);
759 hb_insert_dotted_circle (c->buffer, c->font);
760 hb_form_clusters (c->buffer);
762 hb_ensure_native_direction (c->buffer);
764 if (c->plan->shaper->preprocess_text)
765 c->plan->shaper->preprocess_text (c->plan, c->buffer, c->font);
767 hb_ot_substitute (c);
770 hb_ot_hide_default_ignorables (c);
772 if (c->plan->shaper->postprocess_glyphs)
773 c->plan->shaper->postprocess_glyphs (c->plan, c->buffer, c->font);
775 _hb_buffer_deallocate_unicode_vars (c->buffer);
777 c->buffer->props.direction = c->target_direction;
779 c->buffer->max_len = HB_BUFFER_MAX_LEN_DEFAULT;
780 c->buffer->deallocate_var_all ();
785 _hb_ot_shape (hb_shape_plan_t *shape_plan,
788 const hb_feature_t *features,
789 unsigned int num_features)
791 hb_ot_shape_context_t c = {HB_SHAPER_DATA_GET (shape_plan), font, font->face, buffer, features, num_features};
792 hb_ot_shape_internal (&c);
799 * hb_ot_shape_plan_collect_lookups:
804 hb_ot_shape_plan_collect_lookups (hb_shape_plan_t *shape_plan,
806 hb_set_t *lookup_indexes /* OUT */)
808 /* XXX Does the first part always succeed? */
809 HB_SHAPER_DATA_GET (shape_plan)->collect_lookups (table_tag, lookup_indexes);
813 /* TODO Move this to hb-ot-shape-normalize, make it do decompose, and make it public. */
815 add_char (hb_font_t *font,
816 hb_unicode_funcs_t *unicode,
821 hb_codepoint_t glyph;
822 if (font->get_nominal_glyph (u, &glyph))
826 hb_codepoint_t m = unicode->mirroring (u);
827 if (m != u && font->get_nominal_glyph (m, &glyph))
834 * hb_ot_shape_glyphs_closure:
839 hb_ot_shape_glyphs_closure (hb_font_t *font,
841 const hb_feature_t *features,
842 unsigned int num_features,
845 hb_ot_shape_plan_t plan;
847 const char *shapers[] = {"ot", NULL};
848 hb_shape_plan_t *shape_plan = hb_shape_plan_create_cached (font->face, &buffer->props,
849 features, num_features, shapers);
851 bool mirror = hb_script_get_horizontal_direction (buffer->props.script) == HB_DIRECTION_RTL;
853 unsigned int count = buffer->len;
854 hb_glyph_info_t *info = buffer->info;
855 for (unsigned int i = 0; i < count; i++)
856 add_char (font, buffer->unicode, mirror, info[i].codepoint, glyphs);
860 hb_ot_shape_plan_collect_lookups (shape_plan, HB_OT_TAG_GSUB, &lookups);
862 /* And find transitive closure. */
867 for (hb_codepoint_t lookup_index = -1; hb_set_next (&lookups, &lookup_index);)
868 hb_ot_layout_lookup_substitute_closure (font->face, lookup_index, glyphs);
869 } while (!copy.is_equal (glyphs));
871 hb_shape_plan_destroy (shape_plan);