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* Copyright Ā© 2009,2010 Red Hat, Inc.
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* Copyright Ā© 2010,2011,2012 Google, Inc.
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* This is part of HarfBuzz, a text shaping library.
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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* Red Hat Author(s): Behdad Esfahbod
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* Google Author(s): Behdad Esfahbod
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#define hb_ot_shaper_face_data_t hb_ot_layout_t
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#define hb_ot_shaper_shape_plan_data_t hb_ot_shape_plan_t
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#include "hb-shaper-impl-private.hh"
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#include "hb-ot-shape-private.hh"
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#include "hb-ot-shape-complex-private.hh"
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#include "hb-ot-shape-fallback-private.hh"
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#include "hb-ot-shape-normalize-private.hh"
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#include "hb-ot-layout-private.hh"
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#include "hb-unicode-private.hh"
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#include "hb-set-private.hh"
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static hb_tag_t common_features[] = {
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HB_TAG('c','c','m','p'),
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HB_TAG('l','o','c','l'),
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HB_TAG('m','a','r','k'),
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HB_TAG('m','k','m','k'),
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HB_TAG('r','l','i','g'),
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static hb_tag_t horizontal_features[] = {
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HB_TAG('c','a','l','t'),
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HB_TAG('c','l','i','g'),
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HB_TAG('c','u','r','s'),
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HB_TAG('k','e','r','n'),
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HB_TAG('l','i','g','a'),
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HB_TAG('r','c','l','t'),
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hb_ot_shape_collect_features (hb_ot_shape_planner_t *planner,
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const hb_segment_properties_t *props,
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const hb_feature_t *user_features,
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unsigned int num_user_features)
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hb_ot_map_builder_t *map = &planner->map;
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switch (props->direction) {
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case HB_DIRECTION_LTR:
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map->add_global_bool_feature (HB_TAG ('l','t','r','a'));
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map->add_global_bool_feature (HB_TAG ('l','t','r','m'));
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case HB_DIRECTION_RTL:
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map->add_global_bool_feature (HB_TAG ('r','t','l','a'));
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map->add_feature (HB_TAG ('r','t','l','m'), 1, F_NONE);
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case HB_DIRECTION_TTB:
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case HB_DIRECTION_BTT:
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case HB_DIRECTION_INVALID:
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map->add_feature (HB_TAG ('f','r','a','c'), 1, F_NONE);
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map->add_feature (HB_TAG ('n','u','m','r'), 1, F_NONE);
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map->add_feature (HB_TAG ('d','n','o','m'), 1, F_NONE);
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if (planner->shaper->collect_features)
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planner->shaper->collect_features (planner);
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for (unsigned int i = 0; i < ARRAY_LENGTH (common_features); i++)
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map->add_global_bool_feature (common_features[i]);
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if (HB_DIRECTION_IS_HORIZONTAL (props->direction))
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for (unsigned int i = 0; i < ARRAY_LENGTH (horizontal_features); i++)
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map->add_feature (horizontal_features[i], 1, F_GLOBAL |
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(horizontal_features[i] == HB_TAG('k','e','r','n') ?
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F_HAS_FALLBACK : F_NONE));
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/* We really want to find a 'vert' feature if there's any in the font, no
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* matter which script/langsys it is listed (or not) under.
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* See various bugs referenced from:
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* https://github.com/behdad/harfbuzz/issues/63 */
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map->add_feature (HB_TAG ('v','e','r','t'), 1, F_GLOBAL | F_GLOBAL_SEARCH);
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if (planner->shaper->override_features)
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planner->shaper->override_features (planner);
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for (unsigned int i = 0; i < num_user_features; i++) {
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const hb_feature_t *feature = &user_features[i];
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map->add_feature (feature->tag, feature->value,
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(feature->start == 0 && feature->end == (unsigned int) -1) ?
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hb_ot_shaper_face_data_t *
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_hb_ot_shaper_face_data_create (hb_face_t *face)
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return _hb_ot_layout_create (face);
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_hb_ot_shaper_face_data_destroy (hb_ot_shaper_face_data_t *data)
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_hb_ot_layout_destroy (data);
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struct hb_ot_shaper_font_data_t {};
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hb_ot_shaper_font_data_t *
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_hb_ot_shaper_font_data_create (hb_font_t *font)
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return (hb_ot_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED;
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_hb_ot_shaper_font_data_destroy (hb_ot_shaper_font_data_t *data)
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* shaper shape_plan data
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hb_ot_shaper_shape_plan_data_t *
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_hb_ot_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan,
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const hb_feature_t *user_features,
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unsigned int num_user_features)
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hb_ot_shape_plan_t *plan = (hb_ot_shape_plan_t *) calloc (1, sizeof (hb_ot_shape_plan_t));
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if (unlikely (!plan))
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hb_ot_shape_planner_t planner (shape_plan);
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planner.shaper = hb_ot_shape_complex_categorize (&planner);
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hb_ot_shape_collect_features (&planner, &shape_plan->props, user_features, num_user_features);
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planner.compile (*plan);
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if (plan->shaper->data_create) {
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plan->data = plan->shaper->data_create (plan);
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if (unlikely (!plan->data))
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_hb_ot_shaper_shape_plan_data_destroy (hb_ot_shaper_shape_plan_data_t *plan)
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if (plan->shaper->data_destroy)
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plan->shaper->data_destroy (const_cast<void *> (plan->data));
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struct hb_ot_shape_context_t
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hb_ot_shape_plan_t *plan;
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const hb_feature_t *user_features;
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unsigned int num_user_features;
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/* Transient stuff */
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hb_direction_t target_direction;
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hb_set_unicode_props (hb_buffer_t *buffer)
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unsigned int count = buffer->len;
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hb_glyph_info_t *info = buffer->info;
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for (unsigned int i = 0; i < count; i++)
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_hb_glyph_info_set_unicode_props (&info[i], buffer->unicode);
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hb_insert_dotted_circle (hb_buffer_t *buffer, hb_font_t *font)
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if (!(buffer->flags & HB_BUFFER_FLAG_BOT) ||
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buffer->context_len[0] ||
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_hb_glyph_info_get_general_category (&buffer->info[0]) !=
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HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)
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if (!font->has_glyph (0x25CCu))
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hb_glyph_info_t dottedcircle = {0};
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dottedcircle.codepoint = 0x25CCu;
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_hb_glyph_info_set_unicode_props (&dottedcircle, buffer->unicode);
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buffer->clear_output ();
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hb_glyph_info_t info = dottedcircle;
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info.cluster = buffer->cur().cluster;
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info.mask = buffer->cur().mask;
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buffer->output_info (info);
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while (buffer->idx < buffer->len)
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buffer->next_glyph ();
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buffer->swap_buffers ();
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hb_form_clusters (hb_buffer_t *buffer)
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if (buffer->cluster_level != HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES)
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/* Loop duplicated in hb_ensure_native_direction(). */
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unsigned int base = 0;
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unsigned int count = buffer->len;
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hb_glyph_info_t *info = buffer->info;
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for (unsigned int i = 1; i < count; i++)
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if (likely (!HB_UNICODE_GENERAL_CATEGORY_IS_MARK (_hb_glyph_info_get_general_category (&info[i]))))
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buffer->merge_clusters (base, i);
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buffer->merge_clusters (base, count);
285
hb_ensure_native_direction (hb_buffer_t *buffer)
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hb_direction_t direction = buffer->props.direction;
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* The only BTT vertical script is Ogham, but it's not clear to me whether OpenType
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* Ogham fonts are supposed to be implemented BTT or not. Need to research that
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if ((HB_DIRECTION_IS_HORIZONTAL (direction) && direction != hb_script_get_horizontal_direction (buffer->props.script)) ||
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(HB_DIRECTION_IS_VERTICAL (direction) && direction != HB_DIRECTION_TTB))
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/* Same loop as hb_form_clusters().
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* Since form_clusters() merged clusters already, we don't merge. */
298
unsigned int base = 0;
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unsigned int count = buffer->len;
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hb_glyph_info_t *info = buffer->info;
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for (unsigned int i = 1; i < count; i++)
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if (likely (!HB_UNICODE_GENERAL_CATEGORY_IS_MARK (_hb_glyph_info_get_general_category (&info[i]))))
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if (buffer->cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS)
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buffer->merge_clusters (base, i);
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buffer->reverse_range (base, i);
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if (buffer->cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS)
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buffer->merge_clusters (base, count);
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buffer->reverse_range (base, count);
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buffer->props.direction = HB_DIRECTION_REVERSE (buffer->props.direction);
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hb_ot_mirror_chars (hb_ot_shape_context_t *c)
328
if (HB_DIRECTION_IS_FORWARD (c->target_direction))
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hb_buffer_t *buffer = c->buffer;
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hb_unicode_funcs_t *unicode = buffer->unicode;
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hb_mask_t rtlm_mask = c->plan->rtlm_mask;
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unsigned int count = buffer->len;
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hb_glyph_info_t *info = buffer->info;
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for (unsigned int i = 0; i < count; i++) {
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hb_codepoint_t codepoint = unicode->mirroring (info[i].codepoint);
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if (likely (codepoint == info[i].codepoint || !c->font->has_glyph (codepoint)))
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info[i].mask |= rtlm_mask;
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info[i].codepoint = codepoint;
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hb_ot_shape_setup_masks_fraction (hb_ot_shape_context_t *c)
349
if (!c->plan->has_frac)
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hb_buffer_t *buffer = c->buffer;
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/* TODO look in pre/post context text also. */
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unsigned int count = buffer->len;
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hb_glyph_info_t *info = buffer->info;
357
for (unsigned int i = 0; i < count; i++)
359
if (info[i].codepoint == 0x2044u) /* FRACTION SLASH */
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unsigned int start = i, end = i + 1;
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_hb_glyph_info_get_general_category (&info[start - 1]) ==
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HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER)
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while (end < count &&
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_hb_glyph_info_get_general_category (&info[end]) ==
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HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER)
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for (unsigned int j = start; j < i; j++)
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info[j].mask |= c->plan->numr_mask | c->plan->frac_mask;
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info[i].mask |= c->plan->frac_mask;
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for (unsigned int j = i + 1; j < end; j++)
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info[j].mask |= c->plan->frac_mask | c->plan->dnom_mask;
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hb_ot_shape_initialize_masks (hb_ot_shape_context_t *c)
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hb_ot_map_t *map = &c->plan->map;
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hb_buffer_t *buffer = c->buffer;
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hb_mask_t global_mask = map->get_global_mask ();
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buffer->reset_masks (global_mask);
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hb_ot_shape_setup_masks (hb_ot_shape_context_t *c)
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hb_ot_map_t *map = &c->plan->map;
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hb_buffer_t *buffer = c->buffer;
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hb_ot_shape_setup_masks_fraction (c);
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if (c->plan->shaper->setup_masks)
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c->plan->shaper->setup_masks (c->plan, buffer, c->font);
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for (unsigned int i = 0; i < c->num_user_features; i++)
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const hb_feature_t *feature = &c->user_features[i];
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if (!(feature->start == 0 && feature->end == (unsigned int)-1)) {
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hb_mask_t mask = map->get_mask (feature->tag, &shift);
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buffer->set_masks (feature->value << shift, mask, feature->start, feature->end);
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hb_ot_zero_width_default_ignorables (hb_ot_shape_context_t *c)
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hb_buffer_t *buffer = c->buffer;
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if (buffer->flags & HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES)
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unsigned int count = buffer->len;
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hb_glyph_info_t *info = buffer->info;
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hb_glyph_position_t *pos = buffer->pos;
426
for (i = 0; i < count; i++)
427
if (unlikely (_hb_glyph_info_is_default_ignorable (&info[i])))
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pos[i].x_advance = pos[i].y_advance = pos[i].x_offset = pos[i].y_offset = 0;
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hb_ot_hide_default_ignorables (hb_ot_shape_context_t *c)
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hb_buffer_t *buffer = c->buffer;
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if (buffer->flags & HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES)
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unsigned int count = buffer->len;
440
hb_glyph_info_t *info = buffer->info;
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hb_glyph_position_t *pos = buffer->pos;
443
for (i = 0; i < count; i++)
445
if (unlikely (_hb_glyph_info_is_default_ignorable (&info[i])))
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/* No default-ignorables found; return. */
453
hb_codepoint_t space;
454
if (c->font->get_glyph (' ', 0, &space))
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/* Replace default-ignorables with a zero-advance space glyph. */
457
for (/*continue*/; i < count; i++)
459
if (_hb_glyph_info_is_default_ignorable (&info[i]))
460
info[i].codepoint = space;
465
/* Merge clusters and delete default-ignorables.
466
* NOTE! We can't use out-buffer as we have positioning data. */
468
for (; i < count; i++)
470
if (_hb_glyph_info_is_default_ignorable (&info[i]))
473
* Same logic as buffer->delete_glyph(), but for in-place removal. */
475
unsigned int cluster = info[i].cluster;
476
if (i + 1 < count && cluster == info[i + 1].cluster)
477
continue; /* Cluster survives; do nothing. */
481
/* Merge cluster backward. */
482
if (cluster < info[j - 1].cluster)
484
unsigned int old_cluster = info[j - 1].cluster;
485
for (unsigned k = j; k && info[k - 1].cluster == old_cluster; k--)
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info[k - 1].cluster = cluster;
492
buffer->merge_clusters (i, i + 2); /* Merge cluster forward. */
510
hb_ot_map_glyphs_fast (hb_buffer_t *buffer)
512
/* Normalization process sets up glyph_index(), we just copy it. */
513
unsigned int count = buffer->len;
514
hb_glyph_info_t *info = buffer->info;
515
for (unsigned int i = 0; i < count; i++)
516
info[i].codepoint = info[i].glyph_index();
518
buffer->content_type = HB_BUFFER_CONTENT_TYPE_GLYPHS;
522
hb_synthesize_glyph_classes (hb_ot_shape_context_t *c)
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unsigned int count = c->buffer->len;
525
hb_glyph_info_t *info = c->buffer->info;
526
for (unsigned int i = 0; i < count; i++)
528
hb_ot_layout_glyph_class_mask_t klass;
530
/* Never mark default-ignorables as marks.
531
* They won't get in the way of lookups anyway,
532
* but having them as mark will cause them to be skipped
533
* over if the lookup-flag says so, but at least for the
534
* Mongolian variation selectors, looks like Uniscribe
535
* marks them as non-mark. Some Mongolian fonts without
536
* GDEF rely on this. Another notable character that
537
* this applies to is COMBINING GRAPHEME JOINER. */
538
klass = (_hb_glyph_info_get_general_category (&info[i]) !=
539
HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK ||
540
_hb_glyph_info_is_default_ignorable (&info[i])) ?
541
HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH :
542
HB_OT_LAYOUT_GLYPH_PROPS_MARK;
543
_hb_glyph_info_set_glyph_props (&info[i], klass);
548
hb_ot_substitute_default (hb_ot_shape_context_t *c)
550
hb_buffer_t *buffer = c->buffer;
552
if (c->plan->shaper->preprocess_text)
553
c->plan->shaper->preprocess_text (c->plan, buffer, c->font);
555
hb_ot_shape_initialize_masks (c);
557
hb_ot_mirror_chars (c);
559
HB_BUFFER_ALLOCATE_VAR (buffer, glyph_index);
561
_hb_ot_shape_normalize (c->plan, buffer, c->font);
563
hb_ot_shape_setup_masks (c);
565
/* This is unfortunate to go here, but necessary... */
566
if (!hb_ot_layout_has_positioning (c->face))
567
_hb_ot_shape_fallback_position_recategorize_marks (c->plan, c->font, buffer);
569
hb_ot_map_glyphs_fast (buffer);
571
HB_BUFFER_DEALLOCATE_VAR (buffer, glyph_index);
575
hb_ot_substitute_complex (hb_ot_shape_context_t *c)
577
hb_buffer_t *buffer = c->buffer;
579
_hb_buffer_allocate_gsubgpos_vars (buffer);
580
hb_ot_layout_substitute_start (c->font, buffer);
582
if (!hb_ot_layout_has_glyph_classes (c->face))
583
hb_synthesize_glyph_classes (c);
585
c->plan->substitute (c->font, buffer);
587
hb_ot_layout_substitute_finish (c->font, buffer);
593
hb_ot_substitute (hb_ot_shape_context_t *c)
595
hb_ot_substitute_default (c);
596
hb_ot_substitute_complex (c);
602
adjust_mark_offsets (hb_glyph_position_t *pos)
604
pos->x_offset -= pos->x_advance;
605
pos->y_offset -= pos->y_advance;
609
zero_mark_width (hb_glyph_position_t *pos)
616
zero_mark_widths_by_unicode (hb_buffer_t *buffer, bool adjust_offsets)
618
unsigned int count = buffer->len;
619
hb_glyph_info_t *info = buffer->info;
620
for (unsigned int i = 0; i < count; i++)
621
if (_hb_glyph_info_get_general_category (&info[i]) == HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)
624
adjust_mark_offsets (&buffer->pos[i]);
625
zero_mark_width (&buffer->pos[i]);
630
zero_mark_widths_by_gdef (hb_buffer_t *buffer, bool adjust_offsets)
632
unsigned int count = buffer->len;
633
hb_glyph_info_t *info = buffer->info;
634
for (unsigned int i = 0; i < count; i++)
635
if (_hb_glyph_info_is_mark (&info[i]))
638
adjust_mark_offsets (&buffer->pos[i]);
639
zero_mark_width (&buffer->pos[i]);
644
hb_ot_position_default (hb_ot_shape_context_t *c)
646
hb_direction_t direction = c->buffer->props.direction;
647
unsigned int count = c->buffer->len;
648
hb_glyph_info_t *info = c->buffer->info;
649
hb_glyph_position_t *pos = c->buffer->pos;
650
for (unsigned int i = 0; i < count; i++)
652
c->font->get_glyph_advance_for_direction (info[i].codepoint,
656
c->font->subtract_glyph_origin_for_direction (info[i].codepoint,
665
hb_ot_position_complex (hb_ot_shape_context_t *c)
668
unsigned int count = c->buffer->len;
669
bool has_positioning = hb_ot_layout_has_positioning (c->face);
670
/* If the font has no GPOS, AND, no fallback positioning will
671
* happen, AND, direction is forward, then when zeroing mark
672
* widths, we shift the mark with it, such that the mark
673
* is positioned hanging over the previous glyph. When
674
* direction is backward we don't shift and it will end up
675
* hanging over the next glyph after the final reordering.
676
* If fallback positinoing happens or GPOS is present, we don't
679
bool adjust_offsets_when_zeroing = !(has_positioning || c->plan->shaper->fallback_position ||
680
HB_DIRECTION_IS_BACKWARD (c->buffer->props.direction));
682
switch (c->plan->shaper->zero_width_marks)
684
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY:
685
zero_mark_widths_by_gdef (c->buffer, adjust_offsets_when_zeroing);
688
/* Not currently used for any shaper:
689
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_UNICODE_EARLY:
690
zero_mark_widths_by_unicode (c->buffer, adjust_offsets_when_zeroing);
695
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE:
696
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_UNICODE_LATE:
697
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE:
703
hb_glyph_info_t *info = c->buffer->info;
704
hb_glyph_position_t *pos = c->buffer->pos;
706
/* Change glyph origin to what GPOS expects, apply GPOS, change it back. */
708
for (unsigned int i = 0; i < count; i++) {
709
c->font->add_glyph_origin_for_direction (info[i].codepoint,
715
c->plan->position (c->font, c->buffer);
717
for (unsigned int i = 0; i < count; i++) {
718
c->font->subtract_glyph_origin_for_direction (info[i].codepoint,
727
switch (c->plan->shaper->zero_width_marks)
729
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_UNICODE_LATE:
730
zero_mark_widths_by_unicode (c->buffer, adjust_offsets_when_zeroing);
733
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE:
734
zero_mark_widths_by_gdef (c->buffer, adjust_offsets_when_zeroing);
738
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE:
739
//case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_UNICODE_EARLY:
740
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY:
748
hb_ot_position (hb_ot_shape_context_t *c)
750
hb_ot_layout_position_start (c->font, c->buffer);
752
hb_ot_position_default (c);
754
hb_bool_t fallback = !hb_ot_position_complex (c);
756
hb_ot_zero_width_default_ignorables (c);
758
hb_ot_layout_position_finish (c->font, c->buffer);
760
if (fallback && c->plan->shaper->fallback_position)
761
_hb_ot_shape_fallback_position (c->plan, c->font, c->buffer);
763
if (HB_DIRECTION_IS_BACKWARD (c->buffer->props.direction))
764
hb_buffer_reverse (c->buffer);
766
/* Visual fallback goes here. */
769
_hb_ot_shape_fallback_kern (c->plan, c->font, c->buffer);
771
_hb_buffer_deallocate_gsubgpos_vars (c->buffer);
775
/* Pull it all together! */
778
hb_ot_shape_internal (hb_ot_shape_context_t *c)
780
c->buffer->deallocate_var_all ();
782
/* Save the original direction, we use it later. */
783
c->target_direction = c->buffer->props.direction;
785
_hb_buffer_allocate_unicode_vars (c->buffer);
787
c->buffer->clear_output ();
789
hb_set_unicode_props (c->buffer);
790
hb_insert_dotted_circle (c->buffer, c->font);
791
hb_form_clusters (c->buffer);
793
hb_ensure_native_direction (c->buffer);
795
hb_ot_substitute (c);
798
hb_ot_hide_default_ignorables (c);
800
_hb_buffer_deallocate_unicode_vars (c->buffer);
802
c->buffer->props.direction = c->target_direction;
804
c->buffer->deallocate_var_all ();
809
_hb_ot_shape (hb_shape_plan_t *shape_plan,
812
const hb_feature_t *features,
813
unsigned int num_features)
815
hb_ot_shape_context_t c = {HB_SHAPER_DATA_GET (shape_plan), font, font->face, buffer, features, num_features};
816
hb_ot_shape_internal (&c);
826
hb_ot_shape_plan_collect_lookups (hb_shape_plan_t *shape_plan,
828
hb_set_t *lookup_indexes /* OUT */)
830
/* XXX Does the first part always succeed? */
831
HB_SHAPER_DATA_GET (shape_plan)->collect_lookups (table_tag, lookup_indexes);
835
/* TODO Move this to hb-ot-shape-normalize, make it do decompose, and make it public. */
837
add_char (hb_font_t *font,
838
hb_unicode_funcs_t *unicode,
843
hb_codepoint_t glyph;
844
if (font->get_glyph (u, 0, &glyph))
848
hb_codepoint_t m = unicode->mirroring (u);
849
if (m != u && font->get_glyph (m, 0, &glyph))
859
hb_ot_shape_glyphs_closure (hb_font_t *font,
861
const hb_feature_t *features,
862
unsigned int num_features,
865
hb_ot_shape_plan_t plan;
867
const char *shapers[] = {"ot", NULL};
868
hb_shape_plan_t *shape_plan = hb_shape_plan_create_cached (font->face, &buffer->props,
869
features, num_features, shapers);
871
bool mirror = hb_script_get_horizontal_direction (buffer->props.script) == HB_DIRECTION_RTL;
873
unsigned int count = buffer->len;
874
hb_glyph_info_t *info = buffer->info;
875
for (unsigned int i = 0; i < count; i++)
876
add_char (font, buffer->unicode, mirror, info[i].codepoint, glyphs);
880
hb_ot_shape_plan_collect_lookups (shape_plan, HB_OT_TAG_GSUB, &lookups);
882
/* And find transitive closure. */
887
for (hb_codepoint_t lookup_index = -1; hb_set_next (&lookups, &lookup_index);)
888
hb_ot_layout_lookup_substitute_closure (font->face, lookup_index, glyphs);
889
} while (!copy.is_equal (glyphs));
891
hb_shape_plan_destroy (shape_plan);