| /* |
| * Copyright © 2009,2010 Red Hat, Inc. |
| * Copyright © 2010,2011,2012 Google, Inc. |
| * |
| * This is part of HarfBuzz, a text shaping library. |
| * |
| * Permission is hereby granted, without written agreement and without |
| * license or royalty fees, to use, copy, modify, and distribute this |
| * software and its documentation for any purpose, provided that the |
| * above copyright notice and the following two paragraphs appear in |
| * all copies of this software. |
| * |
| * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
| * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
| * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
| * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
| * DAMAGE. |
| * |
| * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
| * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
| * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
| * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
| * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
| * |
| * Red Hat Author(s): Behdad Esfahbod |
| * Google Author(s): Behdad Esfahbod |
| */ |
| |
| #include "hb.hh" |
| |
| #ifndef HB_NO_OT_SHAPE |
| |
| #ifdef HB_NO_OT_LAYOUT |
| #error "Cannot compile 'ot' shaper with HB_NO_OT_LAYOUT." |
| #endif |
| |
| #include "hb-shaper-impl.hh" |
| |
| #include "hb-ot-shape.hh" |
| #include "hb-ot-shape-complex.hh" |
| #include "hb-ot-shape-fallback.hh" |
| #include "hb-ot-shape-normalize.hh" |
| |
| #include "hb-ot-face.hh" |
| |
| #include "hb-set.hh" |
| |
| #include "hb-aat-layout.hh" |
| |
| |
| #ifndef HB_NO_AAT_SHAPE |
| static inline bool |
| _hb_apply_morx (hb_face_t *face, const hb_segment_properties_t *props) |
| { |
| /* https://github.com/harfbuzz/harfbuzz/issues/2124 */ |
| return hb_aat_layout_has_substitution (face) && |
| (HB_DIRECTION_IS_HORIZONTAL (props->direction) || !hb_ot_layout_has_substitution (face)); |
| } |
| #endif |
| |
| /** |
| * SECTION:hb-ot-shape |
| * @title: hb-ot-shape |
| * @short_description: OpenType shaping support |
| * @include: hb-ot.h |
| * |
| * Support functions for OpenType shaping related queries. |
| **/ |
| |
| |
| static void |
| hb_ot_shape_collect_features (hb_ot_shape_planner_t *planner, |
| const hb_feature_t *user_features, |
| unsigned int num_user_features); |
| |
| hb_ot_shape_planner_t::hb_ot_shape_planner_t (hb_face_t *face, |
| const hb_segment_properties_t *props) : |
| face (face), |
| props (*props), |
| map (face, props), |
| aat_map (face, props) |
| #ifndef HB_NO_AAT_SHAPE |
| , apply_morx (_hb_apply_morx (face, props)) |
| #endif |
| { |
| shaper = hb_ot_shape_complex_categorize (this); |
| |
| script_zero_marks = shaper->zero_width_marks != HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE; |
| script_fallback_mark_positioning = shaper->fallback_position; |
| |
| /* https://github.com/harfbuzz/harfbuzz/issues/1528 */ |
| if (apply_morx && shaper != &_hb_ot_complex_shaper_default) |
| shaper = &_hb_ot_complex_shaper_dumber; |
| } |
| |
| void |
| hb_ot_shape_planner_t::compile (hb_ot_shape_plan_t &plan, |
| const hb_ot_shape_plan_key_t &key) |
| { |
| plan.props = props; |
| plan.shaper = shaper; |
| map.compile (plan.map, key); |
| #ifndef HB_NO_AAT_SHAPE |
| if (apply_morx) |
| aat_map.compile (plan.aat_map); |
| #endif |
| |
| #ifndef HB_NO_OT_SHAPE_FRACTIONS |
| plan.frac_mask = plan.map.get_1_mask (HB_TAG ('f','r','a','c')); |
| plan.numr_mask = plan.map.get_1_mask (HB_TAG ('n','u','m','r')); |
| plan.dnom_mask = plan.map.get_1_mask (HB_TAG ('d','n','o','m')); |
| plan.has_frac = plan.frac_mask || (plan.numr_mask && plan.dnom_mask); |
| #endif |
| |
| plan.rtlm_mask = plan.map.get_1_mask (HB_TAG ('r','t','l','m')); |
| plan.has_vert = !!plan.map.get_1_mask (HB_TAG ('v','e','r','t')); |
| |
| hb_tag_t kern_tag = HB_DIRECTION_IS_HORIZONTAL (props.direction) ? |
| HB_TAG ('k','e','r','n') : HB_TAG ('v','k','r','n'); |
| #ifndef HB_NO_OT_KERN |
| plan.kern_mask = plan.map.get_mask (kern_tag); |
| plan.requested_kerning = !!plan.kern_mask; |
| #endif |
| #ifndef HB_NO_AAT_SHAPE |
| plan.trak_mask = plan.map.get_mask (HB_TAG ('t','r','a','k')); |
| plan.requested_tracking = !!plan.trak_mask; |
| #endif |
| |
| bool has_gpos_kern = plan.map.get_feature_index (1, kern_tag) != HB_OT_LAYOUT_NO_FEATURE_INDEX; |
| bool disable_gpos = plan.shaper->gpos_tag && |
| plan.shaper->gpos_tag != plan.map.chosen_script[1]; |
| |
| /* |
| * Decide who provides glyph classes. GDEF or Unicode. |
| */ |
| |
| if (!hb_ot_layout_has_glyph_classes (face)) |
| plan.fallback_glyph_classes = true; |
| |
| /* |
| * Decide who does substitutions. GSUB, morx, or fallback. |
| */ |
| |
| #ifndef HB_NO_AAT_SHAPE |
| plan.apply_morx = apply_morx; |
| #endif |
| |
| /* |
| * Decide who does positioning. GPOS, kerx, kern, or fallback. |
| */ |
| |
| #ifndef HB_NO_AAT_SHAPE |
| bool has_gsub = hb_ot_layout_has_substitution (face); |
| #endif |
| bool has_gpos = !disable_gpos && hb_ot_layout_has_positioning (face); |
| if (false) |
| ; |
| #ifndef HB_NO_AAT_SHAPE |
| else if (hb_aat_layout_has_positioning (face) && !(has_gsub && has_gpos)) |
| plan.apply_kerx = true; |
| #endif |
| else if (!apply_morx && has_gpos) |
| plan.apply_gpos = true; |
| |
| if (!plan.apply_kerx && (!has_gpos_kern || !plan.apply_gpos)) |
| { |
| /* Apparently Apple applies kerx if GPOS kern was not applied. */ |
| #ifndef HB_NO_AAT_SHAPE |
| if (hb_aat_layout_has_positioning (face)) |
| plan.apply_kerx = true; |
| else |
| #endif |
| #ifndef HB_NO_OT_KERN |
| if (hb_ot_layout_has_kerning (face)) |
| plan.apply_kern = true; |
| #endif |
| } |
| |
| plan.apply_fallback_kern = !(plan.apply_gpos || plan.apply_kerx || plan.apply_kern); |
| |
| plan.zero_marks = script_zero_marks && |
| !plan.apply_kerx && |
| (!plan.apply_kern |
| #ifndef HB_NO_OT_KERN |
| || !hb_ot_layout_has_machine_kerning (face) |
| #endif |
| ); |
| plan.has_gpos_mark = !!plan.map.get_1_mask (HB_TAG ('m','a','r','k')); |
| |
| plan.adjust_mark_positioning_when_zeroing = !plan.apply_gpos && |
| !plan.apply_kerx && |
| (!plan.apply_kern |
| #ifndef HB_NO_OT_KERN |
| || !hb_ot_layout_has_cross_kerning (face) |
| #endif |
| ); |
| |
| plan.fallback_mark_positioning = plan.adjust_mark_positioning_when_zeroing && |
| script_fallback_mark_positioning; |
| |
| #ifndef HB_NO_AAT_SHAPE |
| /* If we're using morx shaping, we cancel mark position adjustment because |
| Apple Color Emoji assumes this will NOT be done when forming emoji sequences; |
| https://github.com/harfbuzz/harfbuzz/issues/2967. */ |
| if (plan.apply_morx) |
| plan.adjust_mark_positioning_when_zeroing = false; |
| |
| /* Currently we always apply trak. */ |
| plan.apply_trak = plan.requested_tracking && hb_aat_layout_has_tracking (face); |
| #endif |
| } |
| |
| bool |
| hb_ot_shape_plan_t::init0 (hb_face_t *face, |
| const hb_shape_plan_key_t *key) |
| { |
| map.init (); |
| #ifndef HB_NO_AAT_SHAPE |
| aat_map.init (); |
| #endif |
| |
| hb_ot_shape_planner_t planner (face, |
| &key->props); |
| |
| hb_ot_shape_collect_features (&planner, |
| key->user_features, |
| key->num_user_features); |
| |
| planner.compile (*this, key->ot); |
| |
| if (shaper->data_create) |
| { |
| data = shaper->data_create (this); |
| if (unlikely (!data)) |
| { |
| map.fini (); |
| #ifndef HB_NO_AAT_SHAPE |
| aat_map.fini (); |
| #endif |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| void |
| hb_ot_shape_plan_t::fini () |
| { |
| if (shaper->data_destroy) |
| shaper->data_destroy (const_cast<void *> (data)); |
| |
| map.fini (); |
| #ifndef HB_NO_AAT_SHAPE |
| aat_map.fini (); |
| #endif |
| } |
| |
| void |
| hb_ot_shape_plan_t::substitute (hb_font_t *font, |
| hb_buffer_t *buffer) const |
| { |
| #ifndef HB_NO_AAT_SHAPE |
| if (unlikely (apply_morx)) |
| hb_aat_layout_substitute (this, font, buffer); |
| else |
| #endif |
| map.substitute (this, font, buffer); |
| } |
| |
| void |
| hb_ot_shape_plan_t::position (hb_font_t *font, |
| hb_buffer_t *buffer) const |
| { |
| if (this->apply_gpos) |
| map.position (this, font, buffer); |
| #ifndef HB_NO_AAT_SHAPE |
| else if (this->apply_kerx) |
| hb_aat_layout_position (this, font, buffer); |
| #endif |
| |
| #ifndef HB_NO_OT_KERN |
| if (this->apply_kern) |
| hb_ot_layout_kern (this, font, buffer); |
| #endif |
| else if (this->apply_fallback_kern) |
| _hb_ot_shape_fallback_kern (this, font, buffer); |
| |
| #ifndef HB_NO_AAT_SHAPE |
| if (this->apply_trak) |
| hb_aat_layout_track (this, font, buffer); |
| #endif |
| } |
| |
| |
| static const hb_ot_map_feature_t |
| common_features[] = |
| { |
| {HB_TAG('a','b','v','m'), F_GLOBAL}, |
| {HB_TAG('b','l','w','m'), F_GLOBAL}, |
| {HB_TAG('c','c','m','p'), F_GLOBAL}, |
| {HB_TAG('l','o','c','l'), F_GLOBAL}, |
| {HB_TAG('m','a','r','k'), F_GLOBAL_MANUAL_JOINERS}, |
| {HB_TAG('m','k','m','k'), F_GLOBAL_MANUAL_JOINERS}, |
| {HB_TAG('r','l','i','g'), F_GLOBAL}, |
| }; |
| |
| |
| static const hb_ot_map_feature_t |
| horizontal_features[] = |
| { |
| {HB_TAG('c','a','l','t'), F_GLOBAL}, |
| {HB_TAG('c','l','i','g'), F_GLOBAL}, |
| {HB_TAG('c','u','r','s'), F_GLOBAL}, |
| {HB_TAG('d','i','s','t'), F_GLOBAL}, |
| {HB_TAG('k','e','r','n'), F_GLOBAL_HAS_FALLBACK}, |
| {HB_TAG('l','i','g','a'), F_GLOBAL}, |
| {HB_TAG('r','c','l','t'), F_GLOBAL}, |
| }; |
| |
| static void |
| hb_ot_shape_collect_features (hb_ot_shape_planner_t *planner, |
| const hb_feature_t *user_features, |
| unsigned int num_user_features) |
| { |
| hb_ot_map_builder_t *map = &planner->map; |
| |
| map->enable_feature (HB_TAG('r','v','r','n')); |
| map->add_gsub_pause (nullptr); |
| |
| switch (planner->props.direction) |
| { |
| case HB_DIRECTION_LTR: |
| map->enable_feature (HB_TAG ('l','t','r','a')); |
| map->enable_feature (HB_TAG ('l','t','r','m')); |
| break; |
| case HB_DIRECTION_RTL: |
| map->enable_feature (HB_TAG ('r','t','l','a')); |
| map->add_feature (HB_TAG ('r','t','l','m')); |
| break; |
| case HB_DIRECTION_TTB: |
| case HB_DIRECTION_BTT: |
| case HB_DIRECTION_INVALID: |
| default: |
| break; |
| } |
| |
| #ifndef HB_NO_OT_SHAPE_FRACTIONS |
| /* Automatic fractions. */ |
| map->add_feature (HB_TAG ('f','r','a','c')); |
| map->add_feature (HB_TAG ('n','u','m','r')); |
| map->add_feature (HB_TAG ('d','n','o','m')); |
| #endif |
| |
| /* Random! */ |
| map->enable_feature (HB_TAG ('r','a','n','d'), F_RANDOM, HB_OT_MAP_MAX_VALUE); |
| |
| #ifndef HB_NO_AAT_SHAPE |
| /* Tracking. We enable dummy feature here just to allow disabling |
| * AAT 'trak' table using features. |
| * https://github.com/harfbuzz/harfbuzz/issues/1303 */ |
| map->enable_feature (HB_TAG ('t','r','a','k'), F_HAS_FALLBACK); |
| #endif |
| |
| map->enable_feature (HB_TAG ('H','a','r','f')); /* Considered required. */ |
| map->enable_feature (HB_TAG ('H','A','R','F')); /* Considered discretionary. */ |
| |
| if (planner->shaper->collect_features) |
| planner->shaper->collect_features (planner); |
| |
| map->enable_feature (HB_TAG ('B','u','z','z')); /* Considered required. */ |
| map->enable_feature (HB_TAG ('B','U','Z','Z')); /* Considered discretionary. */ |
| |
| for (unsigned int i = 0; i < ARRAY_LENGTH (common_features); i++) |
| map->add_feature (common_features[i]); |
| |
| if (HB_DIRECTION_IS_HORIZONTAL (planner->props.direction)) |
| for (unsigned int i = 0; i < ARRAY_LENGTH (horizontal_features); i++) |
| map->add_feature (horizontal_features[i]); |
| else |
| { |
| /* We only apply `vert` feature. See: |
| * https://github.com/harfbuzz/harfbuzz/commit/d71c0df2d17f4590d5611239577a6cb532c26528 |
| * https://lists.freedesktop.org/archives/harfbuzz/2013-August/003490.html */ |
| |
| /* We really want to find a 'vert' feature if there's any in the font, no |
| * matter which script/langsys it is listed (or not) under. |
| * See various bugs referenced from: |
| * https://github.com/harfbuzz/harfbuzz/issues/63 */ |
| map->enable_feature (HB_TAG ('v','e','r','t'), F_GLOBAL_SEARCH); |
| } |
| |
| for (unsigned int i = 0; i < num_user_features; i++) |
| { |
| const hb_feature_t *feature = &user_features[i]; |
| map->add_feature (feature->tag, |
| (feature->start == HB_FEATURE_GLOBAL_START && |
| feature->end == HB_FEATURE_GLOBAL_END) ? F_GLOBAL : F_NONE, |
| feature->value); |
| } |
| |
| #ifndef HB_NO_AAT_SHAPE |
| if (planner->apply_morx) |
| { |
| hb_aat_map_builder_t *aat_map = &planner->aat_map; |
| for (unsigned int i = 0; i < num_user_features; i++) |
| { |
| const hb_feature_t *feature = &user_features[i]; |
| aat_map->add_feature (feature->tag, feature->value); |
| } |
| } |
| #endif |
| |
| if (planner->shaper->override_features) |
| planner->shaper->override_features (planner); |
| } |
| |
| |
| /* |
| * shaper face data |
| */ |
| |
| struct hb_ot_face_data_t {}; |
| |
| hb_ot_face_data_t * |
| _hb_ot_shaper_face_data_create (hb_face_t *face) |
| { |
| return (hb_ot_face_data_t *) HB_SHAPER_DATA_SUCCEEDED; |
| } |
| |
| void |
| _hb_ot_shaper_face_data_destroy (hb_ot_face_data_t *data) |
| { |
| } |
| |
| |
| /* |
| * shaper font data |
| */ |
| |
| struct hb_ot_font_data_t {}; |
| |
| hb_ot_font_data_t * |
| _hb_ot_shaper_font_data_create (hb_font_t *font HB_UNUSED) |
| { |
| return (hb_ot_font_data_t *) HB_SHAPER_DATA_SUCCEEDED; |
| } |
| |
| void |
| _hb_ot_shaper_font_data_destroy (hb_ot_font_data_t *data HB_UNUSED) |
| { |
| } |
| |
| |
| /* |
| * shaper |
| */ |
| |
| struct hb_ot_shape_context_t |
| { |
| hb_ot_shape_plan_t *plan; |
| hb_font_t *font; |
| hb_face_t *face; |
| hb_buffer_t *buffer; |
| const hb_feature_t *user_features; |
| unsigned int num_user_features; |
| |
| /* Transient stuff */ |
| hb_direction_t target_direction; |
| }; |
| |
| |
| |
| /* Main shaper */ |
| |
| |
| /* Prepare */ |
| |
| static void |
| hb_set_unicode_props (hb_buffer_t *buffer) |
| { |
| /* Implement enough of Unicode Graphemes here that shaping |
| * in reverse-direction wouldn't break graphemes. Namely, |
| * we mark all marks and ZWJ and ZWJ,Extended_Pictographic |
| * sequences as continuations. The foreach_grapheme() |
| * macro uses this bit. |
| * |
| * https://www.unicode.org/reports/tr29/#Regex_Definitions |
| */ |
| unsigned int count = buffer->len; |
| hb_glyph_info_t *info = buffer->info; |
| for (unsigned int i = 0; i < count; i++) |
| { |
| _hb_glyph_info_set_unicode_props (&info[i], buffer); |
| |
| /* Marks are already set as continuation by the above line. |
| * Handle Emoji_Modifier and ZWJ-continuation. */ |
| if (unlikely (_hb_glyph_info_get_general_category (&info[i]) == HB_UNICODE_GENERAL_CATEGORY_MODIFIER_SYMBOL && |
| hb_in_range<hb_codepoint_t> (info[i].codepoint, 0x1F3FBu, 0x1F3FFu))) |
| { |
| _hb_glyph_info_set_continuation (&info[i]); |
| } |
| /* Regional_Indicators are hairy as hell... |
| * https://github.com/harfbuzz/harfbuzz/issues/2265 */ |
| else if (unlikely (i && hb_in_range<hb_codepoint_t> (info[i].codepoint, 0x1F1E6u, 0x1F1FFu))) |
| { |
| if (hb_in_range<hb_codepoint_t> (info[i - 1].codepoint, 0x1F1E6u, 0x1F1FFu) && |
| !_hb_glyph_info_is_continuation (&info[i - 1])) |
| _hb_glyph_info_set_continuation (&info[i]); |
| } |
| #ifndef HB_NO_EMOJI_SEQUENCES |
| else if (unlikely (_hb_glyph_info_is_zwj (&info[i]))) |
| { |
| _hb_glyph_info_set_continuation (&info[i]); |
| if (i + 1 < count && |
| _hb_unicode_is_emoji_Extended_Pictographic (info[i + 1].codepoint)) |
| { |
| i++; |
| _hb_glyph_info_set_unicode_props (&info[i], buffer); |
| _hb_glyph_info_set_continuation (&info[i]); |
| } |
| } |
| #endif |
| /* Or part of the Other_Grapheme_Extend that is not marks. |
| * As of Unicode 11 that is just: |
| * |
| * 200C ; Other_Grapheme_Extend # Cf ZERO WIDTH NON-JOINER |
| * FF9E..FF9F ; Other_Grapheme_Extend # Lm [2] HALFWIDTH KATAKANA VOICED SOUND MARK..HALFWIDTH KATAKANA SEMI-VOICED SOUND MARK |
| * E0020..E007F ; Other_Grapheme_Extend # Cf [96] TAG SPACE..CANCEL TAG |
| * |
| * ZWNJ is special, we don't want to merge it as there's no need, and keeping |
| * it separate results in more granular clusters. Ignore Katakana for now. |
| * Tags are used for Emoji sub-region flag sequences: |
| * https://github.com/harfbuzz/harfbuzz/issues/1556 |
| */ |
| else if (unlikely (hb_in_range<hb_codepoint_t> (info[i].codepoint, 0xE0020u, 0xE007Fu))) |
| _hb_glyph_info_set_continuation (&info[i]); |
| } |
| } |
| |
| static void |
| hb_insert_dotted_circle (hb_buffer_t *buffer, hb_font_t *font) |
| { |
| if (unlikely (buffer->flags & HB_BUFFER_FLAG_DO_NOT_INSERT_DOTTED_CIRCLE)) |
| return; |
| |
| if (!(buffer->flags & HB_BUFFER_FLAG_BOT) || |
| buffer->context_len[0] || |
| !_hb_glyph_info_is_unicode_mark (&buffer->info[0])) |
| return; |
| |
| if (!font->has_glyph (0x25CCu)) |
| return; |
| |
| hb_glyph_info_t dottedcircle = {0}; |
| dottedcircle.codepoint = 0x25CCu; |
| _hb_glyph_info_set_unicode_props (&dottedcircle, buffer); |
| |
| buffer->clear_output (); |
| |
| buffer->idx = 0; |
| hb_glyph_info_t info = dottedcircle; |
| info.cluster = buffer->cur().cluster; |
| info.mask = buffer->cur().mask; |
| (void) buffer->output_info (info); |
| |
| buffer->swap_buffers (); |
| } |
| |
| static void |
| hb_form_clusters (hb_buffer_t *buffer) |
| { |
| if (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_NON_ASCII)) |
| return; |
| |
| if (buffer->cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES) |
| foreach_grapheme (buffer, start, end) |
| buffer->merge_clusters (start, end); |
| else |
| foreach_grapheme (buffer, start, end) |
| buffer->unsafe_to_break (start, end); |
| } |
| |
| static void |
| hb_ensure_native_direction (hb_buffer_t *buffer) |
| { |
| hb_direction_t direction = buffer->props.direction; |
| hb_direction_t horiz_dir = hb_script_get_horizontal_direction (buffer->props.script); |
| |
| /* Numeric runs in natively-RTL scripts are actually native-LTR, so we reset |
| * the horiz_dir if the run contains at least one decimal-number char, and no |
| * letter chars (ideally we should be checking for chars with strong |
| * directionality but hb-unicode currently lacks bidi categories). |
| * |
| * This allows digit sequences in Arabic etc to be shaped in "native" |
| * direction, so that features like ligatures will work as intended. |
| * |
| * https://github.com/harfbuzz/harfbuzz/issues/501 |
| */ |
| if (unlikely (horiz_dir == HB_DIRECTION_RTL && direction == HB_DIRECTION_LTR)) |
| { |
| bool found_number = false, found_letter = false; |
| const auto* info = buffer->info; |
| const auto count = buffer->len; |
| for (unsigned i = 0; i < count; i++) |
| { |
| auto gc = _hb_glyph_info_get_general_category (&info[i]); |
| if (gc == HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER) |
| found_number = true; |
| else if (HB_UNICODE_GENERAL_CATEGORY_IS_LETTER (gc)) |
| { |
| found_letter = true; |
| break; |
| } |
| } |
| if (found_number && !found_letter) |
| horiz_dir = HB_DIRECTION_LTR; |
| } |
| |
| /* TODO vertical: |
| * The only BTT vertical script is Ogham, but it's not clear to me whether OpenType |
| * Ogham fonts are supposed to be implemented BTT or not. Need to research that |
| * first. */ |
| if ((HB_DIRECTION_IS_HORIZONTAL (direction) && |
| direction != horiz_dir && horiz_dir != HB_DIRECTION_INVALID) || |
| (HB_DIRECTION_IS_VERTICAL (direction) && |
| direction != HB_DIRECTION_TTB)) |
| { |
| |
| if (buffer->cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS) |
| foreach_grapheme (buffer, start, end) |
| { |
| buffer->merge_clusters (start, end); |
| buffer->reverse_range (start, end); |
| } |
| else |
| foreach_grapheme (buffer, start, end) |
| /* form_clusters() merged clusters already, we don't merge. */ |
| buffer->reverse_range (start, end); |
| |
| buffer->reverse (); |
| |
| buffer->props.direction = HB_DIRECTION_REVERSE (buffer->props.direction); |
| } |
| } |
| |
| |
| /* |
| * Substitute |
| */ |
| |
| static hb_codepoint_t |
| hb_vert_char_for (hb_codepoint_t u) |
| { |
| switch (u >> 8) |
| { |
| case 0x20: switch (u) { |
| case 0x2013u: return 0xfe32u; // EN DASH |
| case 0x2014u: return 0xfe31u; // EM DASH |
| case 0x2025u: return 0xfe30u; // TWO DOT LEADER |
| case 0x2026u: return 0xfe19u; // HORIZONTAL ELLIPSIS |
| } break; |
| case 0x30: switch (u) { |
| case 0x3001u: return 0xfe11u; // IDEOGRAPHIC COMMA |
| case 0x3002u: return 0xfe12u; // IDEOGRAPHIC FULL STOP |
| case 0x3008u: return 0xfe3fu; // LEFT ANGLE BRACKET |
| case 0x3009u: return 0xfe40u; // RIGHT ANGLE BRACKET |
| case 0x300au: return 0xfe3du; // LEFT DOUBLE ANGLE BRACKET |
| case 0x300bu: return 0xfe3eu; // RIGHT DOUBLE ANGLE BRACKET |
| case 0x300cu: return 0xfe41u; // LEFT CORNER BRACKET |
| case 0x300du: return 0xfe42u; // RIGHT CORNER BRACKET |
| case 0x300eu: return 0xfe43u; // LEFT WHITE CORNER BRACKET |
| case 0x300fu: return 0xfe44u; // RIGHT WHITE CORNER BRACKET |
| case 0x3010u: return 0xfe3bu; // LEFT BLACK LENTICULAR BRACKET |
| case 0x3011u: return 0xfe3cu; // RIGHT BLACK LENTICULAR BRACKET |
| case 0x3014u: return 0xfe39u; // LEFT TORTOISE SHELL BRACKET |
| case 0x3015u: return 0xfe3au; // RIGHT TORTOISE SHELL BRACKET |
| case 0x3016u: return 0xfe17u; // LEFT WHITE LENTICULAR BRACKET |
| case 0x3017u: return 0xfe18u; // RIGHT WHITE LENTICULAR BRACKET |
| } break; |
| case 0xfe: switch (u) { |
| case 0xfe4fu: return 0xfe34u; // WAVY LOW LINE |
| } break; |
| case 0xff: switch (u) { |
| case 0xff01u: return 0xfe15u; // FULLWIDTH EXCLAMATION MARK |
| case 0xff08u: return 0xfe35u; // FULLWIDTH LEFT PARENTHESIS |
| case 0xff09u: return 0xfe36u; // FULLWIDTH RIGHT PARENTHESIS |
| case 0xff0cu: return 0xfe10u; // FULLWIDTH COMMA |
| case 0xff1au: return 0xfe13u; // FULLWIDTH COLON |
| case 0xff1bu: return 0xfe14u; // FULLWIDTH SEMICOLON |
| case 0xff1fu: return 0xfe16u; // FULLWIDTH QUESTION MARK |
| case 0xff3bu: return 0xfe47u; // FULLWIDTH LEFT SQUARE BRACKET |
| case 0xff3du: return 0xfe48u; // FULLWIDTH RIGHT SQUARE BRACKET |
| case 0xff3fu: return 0xfe33u; // FULLWIDTH LOW LINE |
| case 0xff5bu: return 0xfe37u; // FULLWIDTH LEFT CURLY BRACKET |
| case 0xff5du: return 0xfe38u; // FULLWIDTH RIGHT CURLY BRACKET |
| } break; |
| } |
| |
| return u; |
| } |
| |
| static inline void |
| hb_ot_rotate_chars (const hb_ot_shape_context_t *c) |
| { |
| hb_buffer_t *buffer = c->buffer; |
| unsigned int count = buffer->len; |
| hb_glyph_info_t *info = buffer->info; |
| |
| if (HB_DIRECTION_IS_BACKWARD (c->target_direction)) |
| { |
| hb_unicode_funcs_t *unicode = buffer->unicode; |
| hb_mask_t rtlm_mask = c->plan->rtlm_mask; |
| |
| for (unsigned int i = 0; i < count; i++) { |
| hb_codepoint_t codepoint = unicode->mirroring (info[i].codepoint); |
| if (unlikely (codepoint != info[i].codepoint && c->font->has_glyph (codepoint))) |
| info[i].codepoint = codepoint; |
| else |
| info[i].mask |= rtlm_mask; |
| } |
| } |
| |
| if (HB_DIRECTION_IS_VERTICAL (c->target_direction) && !c->plan->has_vert) |
| { |
| for (unsigned int i = 0; i < count; i++) { |
| hb_codepoint_t codepoint = hb_vert_char_for (info[i].codepoint); |
| if (unlikely (codepoint != info[i].codepoint && c->font->has_glyph (codepoint))) |
| info[i].codepoint = codepoint; |
| } |
| } |
| } |
| |
| static inline void |
| hb_ot_shape_setup_masks_fraction (const hb_ot_shape_context_t *c) |
| { |
| #ifdef HB_NO_OT_SHAPE_FRACTIONS |
| return; |
| #endif |
| |
| if (!(c->buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_NON_ASCII) || |
| !c->plan->has_frac) |
| return; |
| |
| hb_buffer_t *buffer = c->buffer; |
| |
| hb_mask_t pre_mask, post_mask; |
| if (HB_DIRECTION_IS_FORWARD (buffer->props.direction)) |
| { |
| pre_mask = c->plan->numr_mask | c->plan->frac_mask; |
| post_mask = c->plan->frac_mask | c->plan->dnom_mask; |
| } |
| else |
| { |
| pre_mask = c->plan->frac_mask | c->plan->dnom_mask; |
| post_mask = c->plan->numr_mask | c->plan->frac_mask; |
| } |
| |
| unsigned int count = buffer->len; |
| hb_glyph_info_t *info = buffer->info; |
| for (unsigned int i = 0; i < count; i++) |
| { |
| if (info[i].codepoint == 0x2044u) /* FRACTION SLASH */ |
| { |
| unsigned int start = i, end = i + 1; |
| while (start && |
| _hb_glyph_info_get_general_category (&info[start - 1]) == |
| HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER) |
| start--; |
| while (end < count && |
| _hb_glyph_info_get_general_category (&info[end]) == |
| HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER) |
| end++; |
| |
| buffer->unsafe_to_break (start, end); |
| |
| for (unsigned int j = start; j < i; j++) |
| info[j].mask |= pre_mask; |
| info[i].mask |= c->plan->frac_mask; |
| for (unsigned int j = i + 1; j < end; j++) |
| info[j].mask |= post_mask; |
| |
| i = end - 1; |
| } |
| } |
| } |
| |
| static inline void |
| hb_ot_shape_initialize_masks (const hb_ot_shape_context_t *c) |
| { |
| hb_ot_map_t *map = &c->plan->map; |
| hb_buffer_t *buffer = c->buffer; |
| |
| hb_mask_t global_mask = map->get_global_mask (); |
| buffer->reset_masks (global_mask); |
| } |
| |
| static inline void |
| hb_ot_shape_setup_masks (const hb_ot_shape_context_t *c) |
| { |
| hb_ot_map_t *map = &c->plan->map; |
| hb_buffer_t *buffer = c->buffer; |
| |
| hb_ot_shape_setup_masks_fraction (c); |
| |
| if (c->plan->shaper->setup_masks) |
| c->plan->shaper->setup_masks (c->plan, buffer, c->font); |
| |
| for (unsigned int i = 0; i < c->num_user_features; i++) |
| { |
| const hb_feature_t *feature = &c->user_features[i]; |
| if (!(feature->start == HB_FEATURE_GLOBAL_START && feature->end == HB_FEATURE_GLOBAL_END)) { |
| unsigned int shift; |
| hb_mask_t mask = map->get_mask (feature->tag, &shift); |
| buffer->set_masks (feature->value << shift, mask, feature->start, feature->end); |
| } |
| } |
| } |
| |
| static void |
| hb_ot_zero_width_default_ignorables (const hb_buffer_t *buffer) |
| { |
| if (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_DEFAULT_IGNORABLES) || |
| (buffer->flags & HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES) || |
| (buffer->flags & HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES)) |
| return; |
| |
| unsigned int count = buffer->len; |
| hb_glyph_info_t *info = buffer->info; |
| hb_glyph_position_t *pos = buffer->pos; |
| unsigned int i = 0; |
| for (i = 0; i < count; i++) |
| if (unlikely (_hb_glyph_info_is_default_ignorable (&info[i]))) |
| pos[i].x_advance = pos[i].y_advance = pos[i].x_offset = pos[i].y_offset = 0; |
| } |
| |
| static void |
| hb_ot_hide_default_ignorables (hb_buffer_t *buffer, |
| hb_font_t *font) |
| { |
| if (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_DEFAULT_IGNORABLES) || |
| (buffer->flags & HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES)) |
| return; |
| |
| unsigned int count = buffer->len; |
| hb_glyph_info_t *info = buffer->info; |
| |
| hb_codepoint_t invisible = buffer->invisible; |
| if (!(buffer->flags & HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES) && |
| (invisible || font->get_nominal_glyph (' ', &invisible))) |
| { |
| /* Replace default-ignorables with a zero-advance invisible glyph. */ |
| for (unsigned int i = 0; i < count; i++) |
| { |
| if (_hb_glyph_info_is_default_ignorable (&info[i])) |
| info[i].codepoint = invisible; |
| } |
| } |
| else |
| hb_ot_layout_delete_glyphs_inplace (buffer, _hb_glyph_info_is_default_ignorable); |
| } |
| |
| |
| static inline void |
| hb_ot_map_glyphs_fast (hb_buffer_t *buffer) |
| { |
| /* Normalization process sets up glyph_index(), we just copy it. */ |
| unsigned int count = buffer->len; |
| hb_glyph_info_t *info = buffer->info; |
| for (unsigned int i = 0; i < count; i++) |
| info[i].codepoint = info[i].glyph_index(); |
| |
| buffer->content_type = HB_BUFFER_CONTENT_TYPE_GLYPHS; |
| } |
| |
| static inline void |
| hb_synthesize_glyph_classes (hb_buffer_t *buffer) |
| { |
| unsigned int count = buffer->len; |
| hb_glyph_info_t *info = buffer->info; |
| for (unsigned int i = 0; i < count; i++) |
| { |
| hb_ot_layout_glyph_props_flags_t klass; |
| |
| /* Never mark default-ignorables as marks. |
| * They won't get in the way of lookups anyway, |
| * but having them as mark will cause them to be skipped |
| * over if the lookup-flag says so, but at least for the |
| * Mongolian variation selectors, looks like Uniscribe |
| * marks them as non-mark. Some Mongolian fonts without |
| * GDEF rely on this. Another notable character that |
| * this applies to is COMBINING GRAPHEME JOINER. */ |
| klass = (_hb_glyph_info_get_general_category (&info[i]) != |
| HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK || |
| _hb_glyph_info_is_default_ignorable (&info[i])) ? |
| HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH : |
| HB_OT_LAYOUT_GLYPH_PROPS_MARK; |
| _hb_glyph_info_set_glyph_props (&info[i], klass); |
| } |
| } |
| |
| static inline void |
| hb_ot_substitute_default (const hb_ot_shape_context_t *c) |
| { |
| hb_buffer_t *buffer = c->buffer; |
| |
| hb_ot_rotate_chars (c); |
| |
| HB_BUFFER_ALLOCATE_VAR (buffer, glyph_index); |
| |
| _hb_ot_shape_normalize (c->plan, buffer, c->font); |
| |
| hb_ot_shape_setup_masks (c); |
| |
| /* This is unfortunate to go here, but necessary... */ |
| if (c->plan->fallback_mark_positioning) |
| _hb_ot_shape_fallback_mark_position_recategorize_marks (c->plan, c->font, buffer); |
| |
| hb_ot_map_glyphs_fast (buffer); |
| |
| HB_BUFFER_DEALLOCATE_VAR (buffer, glyph_index); |
| } |
| |
| static inline void |
| hb_ot_substitute_complex (const hb_ot_shape_context_t *c) |
| { |
| hb_buffer_t *buffer = c->buffer; |
| |
| hb_ot_layout_substitute_start (c->font, buffer); |
| |
| if (c->plan->fallback_glyph_classes) |
| hb_synthesize_glyph_classes (c->buffer); |
| |
| c->plan->substitute (c->font, buffer); |
| } |
| |
| static inline void |
| hb_ot_substitute_pre (const hb_ot_shape_context_t *c) |
| { |
| hb_ot_substitute_default (c); |
| |
| _hb_buffer_allocate_gsubgpos_vars (c->buffer); |
| |
| hb_ot_substitute_complex (c); |
| } |
| |
| static inline void |
| hb_ot_substitute_post (const hb_ot_shape_context_t *c) |
| { |
| hb_ot_hide_default_ignorables (c->buffer, c->font); |
| #ifndef HB_NO_AAT_SHAPE |
| if (c->plan->apply_morx) |
| hb_aat_layout_remove_deleted_glyphs (c->buffer); |
| #endif |
| |
| if (c->plan->shaper->postprocess_glyphs && |
| c->buffer->message(c->font, "start postprocess-glyphs")) { |
| c->plan->shaper->postprocess_glyphs (c->plan, c->buffer, c->font); |
| (void) c->buffer->message(c->font, "end postprocess-glyphs"); |
| } |
| } |
| |
| |
| /* |
| * Position |
| */ |
| |
| static inline void |
| adjust_mark_offsets (hb_glyph_position_t *pos) |
| { |
| pos->x_offset -= pos->x_advance; |
| pos->y_offset -= pos->y_advance; |
| } |
| |
| static inline void |
| zero_mark_width (hb_glyph_position_t *pos) |
| { |
| pos->x_advance = 0; |
| pos->y_advance = 0; |
| } |
| |
| static inline void |
| zero_mark_widths_by_gdef (hb_buffer_t *buffer, bool adjust_offsets) |
| { |
| unsigned int count = buffer->len; |
| hb_glyph_info_t *info = buffer->info; |
| for (unsigned int i = 0; i < count; i++) |
| if (_hb_glyph_info_is_mark (&info[i])) |
| { |
| if (adjust_offsets) |
| adjust_mark_offsets (&buffer->pos[i]); |
| zero_mark_width (&buffer->pos[i]); |
| } |
| } |
| |
| static inline void |
| hb_ot_position_default (const hb_ot_shape_context_t *c) |
| { |
| hb_direction_t direction = c->buffer->props.direction; |
| unsigned int count = c->buffer->len; |
| hb_glyph_info_t *info = c->buffer->info; |
| hb_glyph_position_t *pos = c->buffer->pos; |
| |
| if (HB_DIRECTION_IS_HORIZONTAL (direction)) |
| { |
| c->font->get_glyph_h_advances (count, &info[0].codepoint, sizeof(info[0]), |
| &pos[0].x_advance, sizeof(pos[0])); |
| /* The nil glyph_h_origin() func returns 0, so no need to apply it. */ |
| if (c->font->has_glyph_h_origin_func ()) |
| for (unsigned int i = 0; i < count; i++) |
| c->font->subtract_glyph_h_origin (info[i].codepoint, |
| &pos[i].x_offset, |
| &pos[i].y_offset); |
| } |
| else |
| { |
| c->font->get_glyph_v_advances (count, &info[0].codepoint, sizeof(info[0]), |
| &pos[0].y_advance, sizeof(pos[0])); |
| for (unsigned int i = 0; i < count; i++) |
| { |
| c->font->subtract_glyph_v_origin (info[i].codepoint, |
| &pos[i].x_offset, |
| &pos[i].y_offset); |
| } |
| } |
| if (c->buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_SPACE_FALLBACK) |
| _hb_ot_shape_fallback_spaces (c->plan, c->font, c->buffer); |
| } |
| |
| static inline void |
| hb_ot_position_complex (const hb_ot_shape_context_t *c) |
| { |
| unsigned int count = c->buffer->len; |
| hb_glyph_info_t *info = c->buffer->info; |
| hb_glyph_position_t *pos = c->buffer->pos; |
| |
| /* If the font has no GPOS and direction is forward, then when |
| * zeroing mark widths, we shift the mark with it, such that the |
| * mark is positioned hanging over the previous glyph. When |
| * direction is backward we don't shift and it will end up |
| * hanging over the next glyph after the final reordering. |
| * |
| * Note: If fallback positinoing happens, we don't care about |
| * this as it will be overriden. |
| */ |
| bool adjust_offsets_when_zeroing = c->plan->adjust_mark_positioning_when_zeroing && |
| HB_DIRECTION_IS_FORWARD (c->buffer->props.direction); |
| |
| /* We change glyph origin to what GPOS expects (horizontal), apply GPOS, change it back. */ |
| |
| /* The nil glyph_h_origin() func returns 0, so no need to apply it. */ |
| if (c->font->has_glyph_h_origin_func ()) |
| for (unsigned int i = 0; i < count; i++) |
| c->font->add_glyph_h_origin (info[i].codepoint, |
| &pos[i].x_offset, |
| &pos[i].y_offset); |
| |
| hb_ot_layout_position_start (c->font, c->buffer); |
| |
| if (c->plan->zero_marks) |
| switch (c->plan->shaper->zero_width_marks) |
| { |
| case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY: |
| zero_mark_widths_by_gdef (c->buffer, adjust_offsets_when_zeroing); |
| break; |
| |
| default: |
| case HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE: |
| case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE: |
| break; |
| } |
| |
| c->plan->position (c->font, c->buffer); |
| |
| if (c->plan->zero_marks) |
| switch (c->plan->shaper->zero_width_marks) |
| { |
| case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE: |
| zero_mark_widths_by_gdef (c->buffer, adjust_offsets_when_zeroing); |
| break; |
| |
| default: |
| case HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE: |
| case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY: |
| break; |
| } |
| |
| /* Finish off. Has to follow a certain order. */ |
| hb_ot_layout_position_finish_advances (c->font, c->buffer); |
| hb_ot_zero_width_default_ignorables (c->buffer); |
| #ifndef HB_NO_AAT_SHAPE |
| if (c->plan->apply_morx) |
| hb_aat_layout_zero_width_deleted_glyphs (c->buffer); |
| #endif |
| hb_ot_layout_position_finish_offsets (c->font, c->buffer); |
| |
| /* The nil glyph_h_origin() func returns 0, so no need to apply it. */ |
| if (c->font->has_glyph_h_origin_func ()) |
| for (unsigned int i = 0; i < count; i++) |
| c->font->subtract_glyph_h_origin (info[i].codepoint, |
| &pos[i].x_offset, |
| &pos[i].y_offset); |
| |
| if (c->plan->fallback_mark_positioning) |
| _hb_ot_shape_fallback_mark_position (c->plan, c->font, c->buffer, |
| adjust_offsets_when_zeroing); |
| } |
| |
| static inline void |
| hb_ot_position (const hb_ot_shape_context_t *c) |
| { |
| c->buffer->clear_positions (); |
| |
| hb_ot_position_default (c); |
| |
| hb_ot_position_complex (c); |
| |
| if (HB_DIRECTION_IS_BACKWARD (c->buffer->props.direction)) |
| hb_buffer_reverse (c->buffer); |
| |
| _hb_buffer_deallocate_gsubgpos_vars (c->buffer); |
| } |
| |
| static inline void |
| hb_propagate_flags (hb_buffer_t *buffer) |
| { |
| /* Propagate cluster-level glyph flags to be the same on all cluster glyphs. |
| * Simplifies using them. */ |
| |
| if (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_UNSAFE_TO_BREAK)) |
| return; |
| |
| hb_glyph_info_t *info = buffer->info; |
| |
| foreach_cluster (buffer, start, end) |
| { |
| unsigned int mask = 0; |
| for (unsigned int i = start; i < end; i++) |
| if (info[i].mask & HB_GLYPH_FLAG_UNSAFE_TO_BREAK) |
| { |
| mask = HB_GLYPH_FLAG_UNSAFE_TO_BREAK; |
| break; |
| } |
| if (mask) |
| for (unsigned int i = start; i < end; i++) |
| info[i].mask |= mask; |
| } |
| } |
| |
| /* Pull it all together! */ |
| |
| static void |
| hb_ot_shape_internal (hb_ot_shape_context_t *c) |
| { |
| c->buffer->deallocate_var_all (); |
| c->buffer->scratch_flags = HB_BUFFER_SCRATCH_FLAG_DEFAULT; |
| if (likely (!hb_unsigned_mul_overflows (c->buffer->len, HB_BUFFER_MAX_LEN_FACTOR))) |
| { |
| c->buffer->max_len = hb_max (c->buffer->len * HB_BUFFER_MAX_LEN_FACTOR, |
| (unsigned) HB_BUFFER_MAX_LEN_MIN); |
| } |
| if (likely (!hb_unsigned_mul_overflows (c->buffer->len, HB_BUFFER_MAX_OPS_FACTOR))) |
| { |
| c->buffer->max_ops = hb_max (c->buffer->len * HB_BUFFER_MAX_OPS_FACTOR, |
| (unsigned) HB_BUFFER_MAX_OPS_MIN); |
| } |
| |
| /* Save the original direction, we use it later. */ |
| c->target_direction = c->buffer->props.direction; |
| |
| _hb_buffer_allocate_unicode_vars (c->buffer); |
| |
| hb_ot_shape_initialize_masks (c); |
| hb_set_unicode_props (c->buffer); |
| hb_insert_dotted_circle (c->buffer, c->font); |
| |
| hb_form_clusters (c->buffer); |
| |
| hb_ensure_native_direction (c->buffer); |
| |
| if (c->plan->shaper->preprocess_text && |
| c->buffer->message(c->font, "start preprocess-text")) |
| { |
| c->plan->shaper->preprocess_text (c->plan, c->buffer, c->font); |
| (void) c->buffer->message(c->font, "end preprocess-text"); |
| } |
| |
| hb_ot_substitute_pre (c); |
| hb_ot_position (c); |
| hb_ot_substitute_post (c); |
| |
| hb_propagate_flags (c->buffer); |
| |
| _hb_buffer_deallocate_unicode_vars (c->buffer); |
| |
| c->buffer->props.direction = c->target_direction; |
| |
| c->buffer->max_len = HB_BUFFER_MAX_LEN_DEFAULT; |
| c->buffer->max_ops = HB_BUFFER_MAX_OPS_DEFAULT; |
| c->buffer->deallocate_var_all (); |
| } |
| |
| |
| hb_bool_t |
| _hb_ot_shape (hb_shape_plan_t *shape_plan, |
| hb_font_t *font, |
| hb_buffer_t *buffer, |
| const hb_feature_t *features, |
| unsigned int num_features) |
| { |
| hb_ot_shape_context_t c = {&shape_plan->ot, font, font->face, buffer, features, num_features}; |
| hb_ot_shape_internal (&c); |
| |
| return true; |
| } |
| |
| |
| /** |
| * hb_ot_shape_plan_collect_lookups: |
| * @shape_plan: #hb_shape_plan_t to query |
| * @table_tag: GSUB or GPOS |
| * @lookup_indexes: (out): The #hb_set_t set of lookups returned |
| * |
| * Computes the complete set of GSUB or GPOS lookups that are applicable |
| * under a given @shape_plan. |
| * |
| * Since: 0.9.7 |
| **/ |
| void |
| hb_ot_shape_plan_collect_lookups (hb_shape_plan_t *shape_plan, |
| hb_tag_t table_tag, |
| hb_set_t *lookup_indexes /* OUT */) |
| { |
| shape_plan->ot.collect_lookups (table_tag, lookup_indexes); |
| } |
| |
| |
| /* TODO Move this to hb-ot-shape-normalize, make it do decompose, and make it public. */ |
| static void |
| add_char (hb_font_t *font, |
| hb_unicode_funcs_t *unicode, |
| hb_bool_t mirror, |
| hb_codepoint_t u, |
| hb_set_t *glyphs) |
| { |
| hb_codepoint_t glyph; |
| if (font->get_nominal_glyph (u, &glyph)) |
| glyphs->add (glyph); |
| if (mirror) |
| { |
| hb_codepoint_t m = unicode->mirroring (u); |
| if (m != u && font->get_nominal_glyph (m, &glyph)) |
| glyphs->add (glyph); |
| } |
| } |
| |
| |
| /** |
| * hb_ot_shape_glyphs_closure: |
| * @font: #hb_font_t to work upon |
| * @buffer: The input buffer to compute from |
| * @features: (array length=num_features): The features enabled on the buffer |
| * @num_features: The number of features enabled on the buffer |
| * @glyphs: (out): The #hb_set_t set of glyphs comprising the transitive closure of the query |
| * |
| * Computes the transitive closure of glyphs needed for a specified |
| * input buffer under the given font and feature list. The closure is |
| * computed as a set, not as a list. |
| * |
| * Since: 0.9.2 |
| **/ |
| void |
| hb_ot_shape_glyphs_closure (hb_font_t *font, |
| hb_buffer_t *buffer, |
| const hb_feature_t *features, |
| unsigned int num_features, |
| hb_set_t *glyphs) |
| { |
| const char *shapers[] = {"ot", nullptr}; |
| hb_shape_plan_t *shape_plan = hb_shape_plan_create_cached (font->face, &buffer->props, |
| features, num_features, shapers); |
| |
| bool mirror = hb_script_get_horizontal_direction (buffer->props.script) == HB_DIRECTION_RTL; |
| |
| unsigned int count = buffer->len; |
| hb_glyph_info_t *info = buffer->info; |
| for (unsigned int i = 0; i < count; i++) |
| add_char (font, buffer->unicode, mirror, info[i].codepoint, glyphs); |
| |
| hb_set_t *lookups = hb_set_create (); |
| hb_ot_shape_plan_collect_lookups (shape_plan, HB_OT_TAG_GSUB, lookups); |
| hb_ot_layout_lookups_substitute_closure (font->face, lookups, glyphs); |
| |
| hb_set_destroy (lookups); |
| |
| hb_shape_plan_destroy (shape_plan); |
| } |
| |
| |
| #endif |