/* * 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-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" /** * 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); static bool _hb_apply_morx (hb_face_t *face) { if (hb_options ().aat && hb_aat_layout_has_substitution (face)) return true; /* Ignore empty GSUB tables. */ return (!hb_ot_layout_has_substitution (face) || !hb_ot_layout_table_get_script_tags (face, HB_OT_TAG_GSUB, 0, nullptr, nullptr)) && hb_aat_layout_has_substitution (face); } 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), apply_morx (_hb_apply_morx (face)) { 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; if (apply_morx) shaper = &_hb_ot_complex_shaper_default; } 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); if (apply_morx) aat_map.compile (plan.aat_map); 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); plan.rtlm_mask = plan.map.get_1_mask (HB_TAG ('r','t','l','m')); hb_tag_t kern_tag = HB_DIRECTION_IS_HORIZONTAL (props.direction) ? HB_TAG ('k','e','r','n') : HB_TAG ('v','k','r','n'); plan.kern_mask = plan.map.get_mask (kern_tag); plan.trak_mask = plan.map.get_mask (HB_TAG ('t','r','a','k')); plan.requested_kerning = !!plan.kern_mask; plan.requested_tracking = !!plan.trak_mask; 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. */ plan.apply_morx = apply_morx; /* * Decide who does positioning. GPOS, kerx, kern, or fallback. */ if (hb_options ().aat && hb_aat_layout_has_positioning (face)) plan.apply_kerx = true; else if (!apply_morx && !disable_gpos && hb_ot_layout_has_positioning (face)) plan.apply_gpos = true; else if (hb_aat_layout_has_positioning (face)) plan.apply_kerx = true; if (!plan.apply_kerx && !has_gpos_kern) { /* Apparently Apple applies kerx if GPOS kern was not applied. */ if (hb_aat_layout_has_positioning (face)) plan.apply_kerx = true; else if (hb_ot_layout_has_kerning (face)) plan.apply_kern = true; } plan.zero_marks = script_zero_marks && !plan.apply_kerx && (!plan.apply_kern || !hb_ot_layout_has_machine_kerning (face)); 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 || !hb_ot_layout_has_cross_kerning (face)); plan.fallback_mark_positioning = plan.adjust_mark_positioning_when_zeroing && script_fallback_mark_positioning; /* Currently we always apply trak. */ plan.apply_trak = plan.requested_tracking && hb_aat_layout_has_tracking (face); } bool hb_ot_shape_plan_t::init0 (hb_face_t *face, const hb_shape_plan_key_t *key) { map.init (); aat_map.init (); 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)) return false; } return true; } void hb_ot_shape_plan_t::fini () { if (shaper->data_destroy) shaper->data_destroy (const_cast (data)); map.fini (); aat_map.fini (); } void hb_ot_shape_plan_t::substitute (hb_font_t *font, hb_buffer_t *buffer) const { if (unlikely (apply_morx)) hb_aat_layout_substitute (this, font, buffer); else 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); else if (this->apply_kerx) hb_aat_layout_position (this, font, buffer); else if (this->apply_kern) hb_ot_layout_kern (this, font, buffer); else _hb_ot_shape_fallback_kern (this, font, buffer); if (this->apply_trak) hb_aat_layout_track (this, font, buffer); } static const hb_ot_map_feature_t common_features[] = { {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('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; } /* 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')); /* Random! */ map->enable_feature (HB_TAG ('r','a','n','d'), F_RANDOM, HB_OT_MAP_MAX_VALUE); /* 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); map->enable_feature (HB_TAG ('H','A','R','F')); if (planner->shaper->collect_features) planner->shaper->collect_features (planner); map->enable_feature (HB_TAG ('B','U','Z','Z')); 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 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); } 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); } } 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 (info[i].codepoint, 0x1F3FBu, 0x1F3FFu))) { _hb_glyph_info_set_continuation (&info[i]); } 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]); } } /* 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 (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 (!(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; buffer->output_info (info); while (buffer->idx < buffer->len && buffer->successful) buffer->next_glyph (); 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); /* 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 inline void hb_ot_mirror_chars (const hb_ot_shape_context_t *c) { if (HB_DIRECTION_IS_FORWARD (c->target_direction)) return; hb_buffer_t *buffer = c->buffer; hb_unicode_funcs_t *unicode = buffer->unicode; hb_mask_t rtlm_mask = c->plan->rtlm_mask; unsigned int count = buffer->len; hb_glyph_info_t *info = buffer->info; for (unsigned int i = 0; i < count; i++) { hb_codepoint_t codepoint = unicode->mirroring (info[i].codepoint); if (likely (codepoint == info[i].codepoint || !c->font->has_glyph (codepoint))) info[i].mask |= rtlm_mask; else info[i].codepoint = codepoint; } } static inline void hb_ot_shape_setup_masks_fraction (const hb_ot_shape_context_t *c) { 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 == 0 && feature->end == (unsigned int)-1)) { 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_mirror_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); if (c->plan->apply_morx) hb_aat_layout_remove_deleted_glyphs (c->buffer); if (c->plan->shaper->postprocess_glyphs) c->plan->shaper->postprocess_glyphs (c->plan, c->buffer, c->font); } /* * 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); if (c->plan->apply_morx) hb_aat_layout_zero_width_deleted_glyphs (c->buffer); 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 = 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 = 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); c->buffer->clear_output (); 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->plan->shaper->preprocess_text (c->plan, c->buffer, c->font); 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: * * 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: * * 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); }