/* * Copyright © 2018 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. * * Google Author(s): Garret Rieger, Roderick Sheeter */ #include "hb-subset-plan.hh" #include "hb-subset-accelerator.hh" #include "hb-map.hh" #include "hb-multimap.hh" #include "hb-set.hh" #include "hb-ot-cmap-table.hh" #include "hb-ot-glyf-table.hh" #include "hb-ot-layout-gdef-table.hh" #include "hb-ot-layout-gpos-table.hh" #include "hb-ot-layout-gsub-table.hh" #include "hb-ot-cff1-table.hh" #include "hb-ot-cff2-table.hh" #include "OT/Color/COLR/COLR.hh" #include "OT/Color/COLR/colrv1-closure.hh" #include "OT/Color/CPAL/CPAL.hh" #include "hb-ot-var-fvar-table.hh" #include "hb-ot-var-avar-table.hh" #include "hb-ot-stat-table.hh" #include "hb-ot-math-table.hh" using OT::Layout::GSUB; using OT::Layout::GPOS; hb_subset_accelerator_t::~hb_subset_accelerator_t () { if (cmap_cache && destroy_cmap_cache) destroy_cmap_cache ((void*) cmap_cache); #ifndef HB_NO_SUBSET_CFF cff1_accel.fini (); cff2_accel.fini (); #endif hb_face_destroy (source); } typedef hb_hashmap_t> script_langsys_map; #ifndef HB_NO_SUBSET_CFF static inline bool _add_cff_seac_components (const OT::cff1::accelerator_subset_t &cff, hb_codepoint_t gid, hb_set_t *gids_to_retain) { hb_codepoint_t base_gid, accent_gid; if (cff.get_seac_components (gid, &base_gid, &accent_gid)) { gids_to_retain->add (base_gid); gids_to_retain->add (accent_gid); return true; } return false; } #endif static void _remap_palette_indexes (const hb_set_t *palette_indexes, hb_map_t *mapping /* OUT */) { unsigned new_idx = 0; for (unsigned palette_index : palette_indexes->iter ()) { if (palette_index == 0xFFFF) { mapping->set (palette_index, palette_index); continue; } mapping->set (palette_index, new_idx); new_idx++; } } static void _remap_indexes (const hb_set_t *indexes, hb_map_t *mapping /* OUT */) { for (auto _ : + hb_enumerate (indexes->iter ())) mapping->set (_.second, _.first); } #ifndef HB_NO_SUBSET_LAYOUT /* * Removes all tags from 'tags' that are not in filter. Additionally eliminates any duplicates. * Returns true if anything was removed (not including duplicates). */ static bool _filter_tag_list(hb_vector_t* tags, /* IN/OUT */ const hb_set_t* filter) { hb_vector_t out; out.alloc (tags->get_size() + 1); // +1 is to allocate room for the null terminator. bool removed = false; hb_set_t visited; for (hb_tag_t tag : *tags) { if (!tag) continue; if (visited.has (tag)) continue; if (!filter->has (tag)) { removed = true; continue; } visited.add (tag); out.push (tag); } // The collect function needs a null element to signal end of the array. out.push (HB_TAG_NONE); hb_swap (out, *tags); return removed; } template static void _collect_layout_indices (hb_subset_plan_t *plan, const T& table, hb_set_t *lookup_indices, /* OUT */ hb_set_t *feature_indices, /* OUT */ hb_hashmap_t> *feature_record_cond_idx_map, /* OUT */ hb_hashmap_t *feature_substitutes_map, /* OUT */ bool& insert_catch_all_feature_variation_record) { unsigned num_features = table.get_feature_count (); hb_vector_t features; if (!plan->check_success (features.resize (num_features))) return; table.get_feature_tags (0, &num_features, features.arrayZ); bool retain_all_features = !_filter_tag_list (&features, &plan->layout_features); unsigned num_scripts = table.get_script_count (); hb_vector_t scripts; if (!plan->check_success (scripts.resize (num_scripts))) return; table.get_script_tags (0, &num_scripts, scripts.arrayZ); bool retain_all_scripts = !_filter_tag_list (&scripts, &plan->layout_scripts); if (!plan->check_success (!features.in_error ()) || !features || !plan->check_success (!scripts.in_error ()) || !scripts) return; hb_ot_layout_collect_features (plan->source, T::tableTag, retain_all_scripts ? nullptr : scripts.arrayZ, nullptr, retain_all_features ? nullptr : features.arrayZ, feature_indices); #ifndef HB_NO_VAR // collect feature substitutes with variations if (!plan->user_axes_location.is_empty ()) { hb_hashmap_t, unsigned> conditionset_map; OT::hb_collect_feature_substitutes_with_var_context_t c = { &plan->axes_old_index_tag_map, &plan->axes_location, feature_record_cond_idx_map, feature_substitutes_map, insert_catch_all_feature_variation_record, feature_indices, false, false, false, 0, &conditionset_map }; table.collect_feature_substitutes_with_variations (&c); } #endif for (unsigned feature_index : *feature_indices) { const OT::Feature* f = &(table.get_feature (feature_index)); const OT::Feature **p = nullptr; if (feature_substitutes_map->has (feature_index, &p)) f = *p; f->add_lookup_indexes_to (lookup_indices); } // If all axes are pinned then all feature variations will be dropped so there's no need // to collect lookups from them. if (!plan->all_axes_pinned) { // TODO(qxliu76): this collection doesn't work correctly for feature variations that are dropped // but not applied. The collection will collect and retain the lookup indices // associated with those dropped but not activated rules. Since partial instancing // isn't yet supported this isn't an issue yet but will need to be fixed for // partial instancing. table.feature_variation_collect_lookups (feature_indices, feature_substitutes_map, lookup_indices); } } static inline void _GSUBGPOS_find_duplicate_features (const OT::GSUBGPOS &g, const hb_map_t *lookup_indices, const hb_set_t *feature_indices, const hb_hashmap_t *feature_substitutes_map, hb_map_t *duplicate_feature_map /* OUT */) { if (feature_indices->is_empty ()) return; hb_hashmap_t> unique_features; //find out duplicate features after subset for (unsigned i : feature_indices->iter ()) { hb_tag_t t = g.get_feature_tag (i); if (t == HB_MAP_VALUE_INVALID) continue; if (!unique_features.has (t)) { if (unlikely (!unique_features.set (t, hb::unique_ptr {hb_set_create ()}))) return; if (unique_features.has (t)) unique_features.get (t)->add (i); duplicate_feature_map->set (i, i); continue; } bool found = false; hb_set_t* same_tag_features = unique_features.get (t); for (unsigned other_f_index : same_tag_features->iter ()) { const OT::Feature* f = &(g.get_feature (i)); const OT::Feature **p = nullptr; if (feature_substitutes_map->has (i, &p)) f = *p; const OT::Feature* other_f = &(g.get_feature (other_f_index)); if (feature_substitutes_map->has (other_f_index, &p)) other_f = *p; auto f_iter = + hb_iter (f->lookupIndex) | hb_filter (lookup_indices) ; auto other_f_iter = + hb_iter (other_f->lookupIndex) | hb_filter (lookup_indices) ; bool is_equal = true; for (; f_iter && other_f_iter; f_iter++, other_f_iter++) { unsigned a = *f_iter; unsigned b = *other_f_iter; if (a != b) { is_equal = false; break; } } if (is_equal == false || f_iter || other_f_iter) continue; found = true; duplicate_feature_map->set (i, other_f_index); break; } if (found == false) { same_tag_features->add (i); duplicate_feature_map->set (i, i); } } } template static inline void _closure_glyphs_lookups_features (hb_subset_plan_t *plan, hb_set_t *gids_to_retain, hb_map_t *lookups, hb_map_t *features, script_langsys_map *langsys_map, hb_hashmap_t> *feature_record_cond_idx_map, hb_hashmap_t *feature_substitutes_map, bool& insert_catch_all_feature_variation_record) { hb_blob_ptr_t table = plan->source_table (); hb_tag_t table_tag = table->tableTag; hb_set_t lookup_indices, feature_indices; _collect_layout_indices (plan, *table, &lookup_indices, &feature_indices, feature_record_cond_idx_map, feature_substitutes_map, insert_catch_all_feature_variation_record); if (table_tag == HB_OT_TAG_GSUB && !(plan->flags & HB_SUBSET_FLAGS_NO_LAYOUT_CLOSURE)) hb_ot_layout_lookups_substitute_closure (plan->source, &lookup_indices, gids_to_retain); table->closure_lookups (plan->source, gids_to_retain, &lookup_indices); _remap_indexes (&lookup_indices, lookups); // prune features table->prune_features (lookups, plan->user_axes_location.is_empty () ? nullptr : feature_record_cond_idx_map, feature_substitutes_map, &feature_indices); hb_map_t duplicate_feature_map; _GSUBGPOS_find_duplicate_features (*table, lookups, &feature_indices, feature_substitutes_map, &duplicate_feature_map); feature_indices.clear (); table->prune_langsys (&duplicate_feature_map, &plan->layout_scripts, langsys_map, &feature_indices); _remap_indexes (&feature_indices, features); table.destroy (); } #endif #ifndef HB_NO_VAR static inline void _generate_varstore_inner_maps (const hb_set_t& varidx_set, unsigned subtable_count, hb_vector_t &inner_maps /* OUT */) { if (varidx_set.is_empty () || subtable_count == 0) return; if (unlikely (!inner_maps.resize (subtable_count))) return; for (unsigned idx : varidx_set) { uint16_t major = idx >> 16; uint16_t minor = idx & 0xFFFF; if (major >= subtable_count) continue; inner_maps[major].add (minor); } } static inline hb_font_t* _get_hb_font_with_variations (const hb_subset_plan_t *plan) { hb_font_t *font = hb_font_create (plan->source); hb_vector_t vars; if (!vars.alloc (plan->user_axes_location.get_population ())) { hb_font_destroy (font); return nullptr; } for (auto _ : plan->user_axes_location) { hb_variation_t var; var.tag = _.first; var.value = _.second.middle; vars.push (var); } #ifndef HB_NO_VAR hb_font_set_variations (font, vars.arrayZ, plan->user_axes_location.get_population ()); #endif return font; } static inline void _collect_layout_variation_indices (hb_subset_plan_t* plan) { hb_blob_ptr_t gdef = plan->source_table (); hb_blob_ptr_t gpos = plan->source_table (); if (!gdef->has_data ()) { gdef.destroy (); gpos.destroy (); return; } const OT::VariationStore *var_store = nullptr; hb_set_t varidx_set; float *store_cache = nullptr; bool collect_delta = plan->pinned_at_default ? false : true; if (collect_delta) { if (gdef->has_var_store ()) { var_store = &(gdef->get_var_store ()); store_cache = var_store->create_cache (); } } OT::hb_collect_variation_indices_context_t c (&varidx_set, &plan->layout_variation_idx_delta_map, plan->normalized_coords ? &(plan->normalized_coords) : nullptr, var_store, &plan->_glyphset_gsub, &plan->gpos_lookups, store_cache); gdef->collect_variation_indices (&c); if (hb_ot_layout_has_positioning (plan->source)) gpos->collect_variation_indices (&c); var_store->destroy_cache (store_cache); gdef->remap_layout_variation_indices (&varidx_set, &plan->layout_variation_idx_delta_map); unsigned subtable_count = gdef->has_var_store () ? gdef->get_var_store ().get_sub_table_count () : 0; _generate_varstore_inner_maps (varidx_set, subtable_count, plan->gdef_varstore_inner_maps); gdef.destroy (); gpos.destroy (); } #endif static inline void _cmap_closure (hb_face_t *face, const hb_set_t *unicodes, hb_set_t *glyphset) { OT::cmap::accelerator_t cmap (face); cmap.table->closure_glyphs (unicodes, glyphset); } static void _colr_closure (hb_face_t *face, hb_map_t *layers_map, hb_map_t *palettes_map, hb_set_t *glyphs_colred) { OT::COLR::accelerator_t colr (face); if (!colr.is_valid ()) return; hb_set_t palette_indices, layer_indices; // Collect all glyphs referenced by COLRv0 hb_set_t glyphset_colrv0; for (hb_codepoint_t gid : *glyphs_colred) colr.closure_glyphs (gid, &glyphset_colrv0); glyphs_colred->union_ (glyphset_colrv0); //closure for COLRv1 colr.closure_forV1 (glyphs_colred, &layer_indices, &palette_indices); colr.closure_V0palette_indices (glyphs_colred, &palette_indices); _remap_indexes (&layer_indices, layers_map); _remap_palette_indexes (&palette_indices, palettes_map); } static inline void _math_closure (hb_subset_plan_t *plan, hb_set_t *glyphset) { hb_blob_ptr_t math = plan->source_table (); if (math->has_data ()) math->closure_glyphs (glyphset); math.destroy (); } static inline void _remove_invalid_gids (hb_set_t *glyphs, unsigned int num_glyphs) { glyphs->del_range (num_glyphs, HB_SET_VALUE_INVALID); } static void _populate_unicodes_to_retain (const hb_set_t *unicodes, const hb_set_t *glyphs, hb_subset_plan_t *plan) { OT::cmap::accelerator_t cmap (plan->source); unsigned size_threshold = plan->source->get_num_glyphs (); if (glyphs->is_empty () && unicodes->get_population () < size_threshold) { const hb_map_t* unicode_to_gid = nullptr; if (plan->accelerator) unicode_to_gid = &plan->accelerator->unicode_to_gid; // This is approach to collection is faster, but can only be used if glyphs // are not being explicitly added to the subset and the input unicodes set is // not excessively large (eg. an inverted set). plan->unicode_to_new_gid_list.alloc (unicodes->get_population ()); if (!unicode_to_gid) { for (hb_codepoint_t cp : *unicodes) { hb_codepoint_t gid; if (!cmap.get_nominal_glyph (cp, &gid)) { DEBUG_MSG(SUBSET, nullptr, "Drop U+%04X; no gid", cp); continue; } plan->codepoint_to_glyph->set (cp, gid); plan->unicode_to_new_gid_list.push (hb_pair (cp, gid)); } } else { // Use in memory unicode to gid map it's faster then looking up from // the map. This code is mostly duplicated from above to avoid doing // conditionals on the presence of the unicode_to_gid map each // iteration. for (hb_codepoint_t cp : *unicodes) { hb_codepoint_t gid = unicode_to_gid->get (cp); if (gid == HB_MAP_VALUE_INVALID) { DEBUG_MSG(SUBSET, nullptr, "Drop U+%04X; no gid", cp); continue; } plan->codepoint_to_glyph->set (cp, gid); plan->unicode_to_new_gid_list.push (hb_pair (cp, gid)); } } } else { // This approach is slower, but can handle adding in glyphs to the subset and will match // them with cmap entries. hb_map_t unicode_glyphid_map_storage; hb_set_t cmap_unicodes_storage; const hb_map_t* unicode_glyphid_map = &unicode_glyphid_map_storage; const hb_set_t* cmap_unicodes = &cmap_unicodes_storage; if (!plan->accelerator) { cmap.collect_mapping (&cmap_unicodes_storage, &unicode_glyphid_map_storage); plan->unicode_to_new_gid_list.alloc (hb_min(unicodes->get_population () + glyphs->get_population (), cmap_unicodes->get_population ())); } else { unicode_glyphid_map = &plan->accelerator->unicode_to_gid; cmap_unicodes = &plan->accelerator->unicodes; } if (plan->accelerator && unicodes->get_population () < cmap_unicodes->get_population () && glyphs->get_population () < cmap_unicodes->get_population ()) { plan->codepoint_to_glyph->alloc (unicodes->get_population () + glyphs->get_population ()); auto &gid_to_unicodes = plan->accelerator->gid_to_unicodes; for (hb_codepoint_t gid : *glyphs) { auto unicodes = gid_to_unicodes.get (gid); for (hb_codepoint_t cp : unicodes) { plan->codepoint_to_glyph->set (cp, gid); plan->unicode_to_new_gid_list.push (hb_pair (cp, gid)); } } for (hb_codepoint_t cp : *unicodes) { /* Don't double-add entry. */ if (plan->codepoint_to_glyph->has (cp)) continue; hb_codepoint_t *gid; if (!unicode_glyphid_map->has(cp, &gid)) continue; plan->codepoint_to_glyph->set (cp, *gid); plan->unicode_to_new_gid_list.push (hb_pair (cp, *gid)); } plan->unicode_to_new_gid_list.qsort (); } else { plan->codepoint_to_glyph->alloc (cmap_unicodes->get_population ()); for (hb_codepoint_t cp : *cmap_unicodes) { hb_codepoint_t gid = (*unicode_glyphid_map)[cp]; if (!unicodes->has (cp) && !glyphs->has (gid)) continue; plan->codepoint_to_glyph->set (cp, gid); plan->unicode_to_new_gid_list.push (hb_pair (cp, gid)); } } /* Add gids which where requested, but not mapped in cmap */ unsigned num_glyphs = plan->source->get_num_glyphs (); hb_codepoint_t first = HB_SET_VALUE_INVALID, last = HB_SET_VALUE_INVALID; for (; glyphs->next_range (&first, &last); ) { if (first >= num_glyphs) break; if (last >= num_glyphs) last = num_glyphs - 1; plan->_glyphset_gsub.add_range (first, last); } } auto &arr = plan->unicode_to_new_gid_list; if (arr.length) { plan->unicodes.add_sorted_array (&arr.arrayZ->first, arr.length, sizeof (*arr.arrayZ)); plan->_glyphset_gsub.add_array (&arr.arrayZ->second, arr.length, sizeof (*arr.arrayZ)); } } #ifndef HB_COMPOSITE_OPERATIONS_PER_GLYPH #define HB_COMPOSITE_OPERATIONS_PER_GLYPH 64 #endif static unsigned _glyf_add_gid_and_children (const OT::glyf_accelerator_t &glyf, hb_codepoint_t gid, hb_set_t *gids_to_retain, int operation_count, unsigned depth = 0) { /* Check if is already visited */ if (gids_to_retain->has (gid)) return operation_count; gids_to_retain->add (gid); if (unlikely (depth++ > HB_MAX_NESTING_LEVEL)) return operation_count; if (unlikely (--operation_count < 0)) return operation_count; auto glyph = glyf.glyph_for_gid (gid); for (auto &item : glyph.get_composite_iterator ()) operation_count = _glyf_add_gid_and_children (glyf, item.get_gid (), gids_to_retain, operation_count, depth); #ifndef HB_NO_VAR_COMPOSITES for (auto &item : glyph.get_var_composite_iterator ()) { operation_count = _glyf_add_gid_and_children (glyf, item.get_gid (), gids_to_retain, operation_count, depth); } #endif return operation_count; } static void _nameid_closure (hb_subset_plan_t* plan, hb_set_t* drop_tables) { #ifndef HB_NO_STYLE plan->source->table.STAT->collect_name_ids (&plan->user_axes_location, &plan->name_ids); #endif #ifndef HB_NO_VAR if (!plan->all_axes_pinned) plan->source->table.fvar->collect_name_ids (&plan->user_axes_location, &plan->axes_old_index_tag_map, &plan->name_ids); #endif #ifndef HB_NO_COLOR if (!drop_tables->has (HB_OT_TAG_CPAL)) plan->source->table.CPAL->collect_name_ids (&plan->colr_palettes, &plan->name_ids); #endif #ifndef HB_NO_SUBSET_LAYOUT if (!drop_tables->has (HB_OT_TAG_GPOS)) { hb_blob_ptr_t gpos = plan->source_table (); gpos->collect_name_ids (&plan->gpos_features, &plan->name_ids); gpos.destroy (); } if (!drop_tables->has (HB_OT_TAG_GSUB)) { hb_blob_ptr_t gsub = plan->source_table (); gsub->collect_name_ids (&plan->gsub_features, &plan->name_ids); gsub.destroy (); } #endif } static void _populate_gids_to_retain (hb_subset_plan_t* plan, hb_set_t* drop_tables) { OT::glyf_accelerator_t glyf (plan->source); #ifndef HB_NO_SUBSET_CFF // Note: we cannot use inprogress_accelerator here, since it has not been // created yet. So in case of preprocessed-face (and otherwise), we do an // extra sanitize pass here, which is not ideal. OT::cff1::accelerator_subset_t stack_cff (plan->accelerator ? nullptr : plan->source); const OT::cff1::accelerator_subset_t *cff (plan->accelerator ? plan->accelerator->cff1_accel.get () : &stack_cff); #endif plan->_glyphset_gsub.add (0); // Not-def _cmap_closure (plan->source, &plan->unicodes, &plan->_glyphset_gsub); #ifndef HB_NO_SUBSET_LAYOUT if (!drop_tables->has (HB_OT_TAG_GSUB)) // closure all glyphs/lookups/features needed for GSUB substitutions. _closure_glyphs_lookups_features ( plan, &plan->_glyphset_gsub, &plan->gsub_lookups, &plan->gsub_features, &plan->gsub_langsys, &plan->gsub_feature_record_cond_idx_map, &plan->gsub_feature_substitutes_map, plan->gsub_insert_catch_all_feature_variation_rec); if (!drop_tables->has (HB_OT_TAG_GPOS)) _closure_glyphs_lookups_features ( plan, &plan->_glyphset_gsub, &plan->gpos_lookups, &plan->gpos_features, &plan->gpos_langsys, &plan->gpos_feature_record_cond_idx_map, &plan->gpos_feature_substitutes_map, plan->gpos_insert_catch_all_feature_variation_rec); #endif _remove_invalid_gids (&plan->_glyphset_gsub, plan->source->get_num_glyphs ()); plan->_glyphset_mathed = plan->_glyphset_gsub; if (!drop_tables->has (HB_OT_TAG_MATH)) { _math_closure (plan, &plan->_glyphset_mathed); _remove_invalid_gids (&plan->_glyphset_mathed, plan->source->get_num_glyphs ()); } hb_set_t cur_glyphset = plan->_glyphset_mathed; if (!drop_tables->has (HB_OT_TAG_COLR)) { _colr_closure (plan->source, &plan->colrv1_layers, &plan->colr_palettes, &cur_glyphset); _remove_invalid_gids (&cur_glyphset, plan->source->get_num_glyphs ()); } plan->_glyphset_colred = cur_glyphset; _nameid_closure (plan, drop_tables); /* Populate a full set of glyphs to retain by adding all referenced * composite glyphs. */ if (glyf.has_data ()) for (hb_codepoint_t gid : cur_glyphset) _glyf_add_gid_and_children (glyf, gid, &plan->_glyphset, cur_glyphset.get_population () * HB_COMPOSITE_OPERATIONS_PER_GLYPH); else plan->_glyphset.union_ (cur_glyphset); #ifndef HB_NO_SUBSET_CFF if (!plan->accelerator || plan->accelerator->has_seac) { bool has_seac = false; if (cff->is_valid ()) for (hb_codepoint_t gid : cur_glyphset) if (_add_cff_seac_components (*cff, gid, &plan->_glyphset)) has_seac = true; plan->has_seac = has_seac; } #endif _remove_invalid_gids (&plan->_glyphset, plan->source->get_num_glyphs ()); #ifndef HB_NO_VAR if (!drop_tables->has (HB_OT_TAG_GDEF)) _collect_layout_variation_indices (plan); #endif } static void _create_glyph_map_gsub (const hb_set_t* glyph_set_gsub, const hb_map_t* glyph_map, hb_map_t* out) { out->alloc (glyph_set_gsub->get_population ()); + hb_iter (glyph_set_gsub) | hb_map ([&] (hb_codepoint_t gid) { return hb_codepoint_pair_t (gid, glyph_map->get (gid)); }) | hb_sink (out) ; } static bool _create_old_gid_to_new_gid_map (const hb_face_t *face, bool retain_gids, const hb_set_t *all_gids_to_retain, const hb_map_t *requested_glyph_map, hb_map_t *glyph_map, /* OUT */ hb_map_t *reverse_glyph_map, /* OUT */ hb_sorted_vector_t *new_to_old_gid_list /* OUT */, unsigned int *num_glyphs /* OUT */) { unsigned pop = all_gids_to_retain->get_population (); reverse_glyph_map->alloc (pop); glyph_map->alloc (pop); new_to_old_gid_list->alloc (pop); if (*requested_glyph_map) { hb_set_t new_gids(requested_glyph_map->values()); if (new_gids.get_population() != requested_glyph_map->get_population()) { DEBUG_MSG (SUBSET, nullptr, "The provided custom glyph mapping is not unique."); return false; } if (retain_gids) { DEBUG_MSG (SUBSET, nullptr, "HB_SUBSET_FLAGS_RETAIN_GIDS cannot be set if " "a custom glyph mapping has been provided."); return false; } hb_codepoint_t max_glyph = 0; hb_set_t remaining; for (auto old_gid : all_gids_to_retain->iter ()) { if (old_gid == 0) { new_to_old_gid_list->push (hb_pair (0u, 0u)); continue; } hb_codepoint_t* new_gid; if (!requested_glyph_map->has (old_gid, &new_gid)) { remaining.add(old_gid); continue; } if (*new_gid > max_glyph) max_glyph = *new_gid; new_to_old_gid_list->push (hb_pair (*new_gid, old_gid)); } new_to_old_gid_list->qsort (); // Anything that wasn't mapped by the requested mapping should // be placed after the requested mapping. for (auto old_gid : remaining) new_to_old_gid_list->push (hb_pair (++max_glyph, old_gid)); *num_glyphs = max_glyph + 1; } else if (!retain_gids) { + hb_enumerate (hb_iter (all_gids_to_retain), (hb_codepoint_t) 0) | hb_sink (new_to_old_gid_list) ; *num_glyphs = new_to_old_gid_list->length; } else { + hb_iter (all_gids_to_retain) | hb_map ([] (hb_codepoint_t _) { return hb_codepoint_pair_t (_, _); }) | hb_sink (new_to_old_gid_list) ; hb_codepoint_t max_glyph = HB_SET_VALUE_INVALID; hb_set_previous (all_gids_to_retain, &max_glyph); *num_glyphs = max_glyph + 1; } + hb_iter (new_to_old_gid_list) | hb_sink (reverse_glyph_map) ; + hb_iter (new_to_old_gid_list) | hb_map (&hb_codepoint_pair_t::reverse) | hb_sink (glyph_map) ; return true; } #ifndef HB_NO_VAR static void _normalize_axes_location (hb_face_t *face, hb_subset_plan_t *plan) { if (plan->user_axes_location.is_empty ()) return; hb_array_t axes = face->table.fvar->get_axes (); plan->normalized_coords.resize (axes.length); bool has_avar = face->table.avar->has_data (); const OT::SegmentMaps *seg_maps = nullptr; unsigned avar_axis_count = 0; if (has_avar) { seg_maps = face->table.avar->get_segment_maps (); avar_axis_count = face->table.avar->get_axis_count(); } bool axis_not_pinned = false; unsigned old_axis_idx = 0, new_axis_idx = 0; for (const auto& axis : axes) { hb_tag_t axis_tag = axis.get_axis_tag (); plan->axes_old_index_tag_map.set (old_axis_idx, axis_tag); if (!plan->user_axes_location.has (axis_tag) || !plan->user_axes_location.get (axis_tag).is_point ()) { axis_not_pinned = true; plan->axes_index_map.set (old_axis_idx, new_axis_idx); new_axis_idx++; } Triple *axis_range; if (plan->user_axes_location.has (axis_tag, &axis_range)) { plan->axes_triple_distances.set (axis_tag, axis.get_triple_distances ()); int normalized_min = axis.normalize_axis_value (axis_range->minimum); int normalized_default = axis.normalize_axis_value (axis_range->middle); int normalized_max = axis.normalize_axis_value (axis_range->maximum); if (has_avar && old_axis_idx < avar_axis_count) { normalized_min = seg_maps->map (normalized_min); normalized_default = seg_maps->map (normalized_default); normalized_max = seg_maps->map (normalized_max); } plan->axes_location.set (axis_tag, Triple (static_cast (normalized_min / 16384.f), static_cast (normalized_default / 16384.f), static_cast (normalized_max / 16384.f))); if (normalized_default != 0) plan->pinned_at_default = false; plan->normalized_coords[old_axis_idx] = normalized_default; } old_axis_idx++; if (has_avar && old_axis_idx < avar_axis_count) seg_maps = &StructAfter (*seg_maps); } plan->all_axes_pinned = !axis_not_pinned; } static void _update_instance_metrics_map_from_cff2 (hb_subset_plan_t *plan) { if (!plan->normalized_coords) return; OT::cff2::accelerator_t cff2 (plan->source); if (!cff2.is_valid ()) return; hb_font_t *font = nullptr; if (unlikely (!plan->check_success (font = _get_hb_font_with_variations (plan)))) { hb_font_destroy (font); return; } hb_glyph_extents_t extents = {0x7FFF, -0x7FFF}; OT::hmtx_accelerator_t _hmtx (plan->source); float *hvar_store_cache = nullptr; if (_hmtx.has_data () && _hmtx.var_table.get_length ()) hvar_store_cache = _hmtx.var_table->get_var_store ().create_cache (); OT::vmtx_accelerator_t _vmtx (plan->source); float *vvar_store_cache = nullptr; if (_vmtx.has_data () && _vmtx.var_table.get_length ()) vvar_store_cache = _vmtx.var_table->get_var_store ().create_cache (); for (auto p : *plan->glyph_map) { hb_codepoint_t old_gid = p.first; hb_codepoint_t new_gid = p.second; if (!cff2.get_extents (font, old_gid, &extents)) continue; bool has_bounds_info = true; if (extents.x_bearing == 0 && extents.width == 0 && extents.height == 0 && extents.y_bearing == 0) has_bounds_info = false; if (has_bounds_info) { plan->head_maxp_info.xMin = hb_min (plan->head_maxp_info.xMin, extents.x_bearing); plan->head_maxp_info.xMax = hb_max (plan->head_maxp_info.xMax, extents.x_bearing + extents.width); plan->head_maxp_info.yMax = hb_max (plan->head_maxp_info.yMax, extents.y_bearing); plan->head_maxp_info.yMin = hb_min (plan->head_maxp_info.yMin, extents.y_bearing + extents.height); } if (_hmtx.has_data ()) { int hori_aw = _hmtx.get_advance_without_var_unscaled (old_gid); if (_hmtx.var_table.get_length ()) hori_aw += (int) roundf (_hmtx.var_table->get_advance_delta_unscaled (old_gid, font->coords, font->num_coords, hvar_store_cache)); int lsb = extents.x_bearing; if (!has_bounds_info) { if (!_hmtx.get_leading_bearing_without_var_unscaled (old_gid, &lsb)) continue; } plan->hmtx_map.set (new_gid, hb_pair ((unsigned) hori_aw, lsb)); plan->bounds_width_vec[new_gid] = extents.width; } if (_vmtx.has_data ()) { int vert_aw = _vmtx.get_advance_without_var_unscaled (old_gid); if (_vmtx.var_table.get_length ()) vert_aw += (int) roundf (_vmtx.var_table->get_advance_delta_unscaled (old_gid, font->coords, font->num_coords, vvar_store_cache)); int tsb = extents.y_bearing; if (!has_bounds_info) { if (!_vmtx.get_leading_bearing_without_var_unscaled (old_gid, &tsb)) continue; } plan->vmtx_map.set (new_gid, hb_pair ((unsigned) vert_aw, tsb)); plan->bounds_height_vec[new_gid] = extents.height; } } hb_font_destroy (font); if (hvar_store_cache) _hmtx.var_table->get_var_store ().destroy_cache (hvar_store_cache); if (vvar_store_cache) _vmtx.var_table->get_var_store ().destroy_cache (vvar_store_cache); } #endif hb_subset_plan_t::hb_subset_plan_t (hb_face_t *face, const hb_subset_input_t *input) { successful = true; flags = input->flags; unicode_to_new_gid_list.init (); name_ids = *input->sets.name_ids; name_languages = *input->sets.name_languages; layout_features = *input->sets.layout_features; layout_scripts = *input->sets.layout_scripts; glyphs_requested = *input->sets.glyphs; drop_tables = *input->sets.drop_tables; no_subset_tables = *input->sets.no_subset_tables; source = hb_face_reference (face); dest = hb_face_builder_create (); codepoint_to_glyph = hb_map_create (); glyph_map = hb_map_create (); reverse_glyph_map = hb_map_create (); gsub_insert_catch_all_feature_variation_rec = false; gpos_insert_catch_all_feature_variation_rec = false; gdef_varstore_inner_maps.init (); user_axes_location = input->axes_location; all_axes_pinned = false; pinned_at_default = true; #ifdef HB_EXPERIMENTAL_API for (auto _ : input->name_table_overrides) { hb_bytes_t name_bytes = _.second; unsigned len = name_bytes.length; char *name_str = (char *) hb_malloc (len); if (unlikely (!check_success (name_str))) break; hb_memcpy (name_str, name_bytes.arrayZ, len); name_table_overrides.set (_.first, hb_bytes_t (name_str, len)); } #endif void* accel = hb_face_get_user_data(face, hb_subset_accelerator_t::user_data_key()); attach_accelerator_data = input->attach_accelerator_data; force_long_loca = input->force_long_loca; if (accel) accelerator = (hb_subset_accelerator_t*) accel; if (unlikely (in_error ())) return; #ifndef HB_NO_VAR _normalize_axes_location (face, this); #endif _populate_unicodes_to_retain (input->sets.unicodes, input->sets.glyphs, this); _populate_gids_to_retain (this, input->sets.drop_tables); if (unlikely (in_error ())) return; if (!check_success(_create_old_gid_to_new_gid_map( face, input->flags & HB_SUBSET_FLAGS_RETAIN_GIDS, &_glyphset, &input->glyph_map, glyph_map, reverse_glyph_map, &new_to_old_gid_list, &_num_output_glyphs))) { return; } _create_glyph_map_gsub ( &_glyphset_gsub, glyph_map, &glyph_map_gsub); // Now that we have old to new gid map update the unicode to new gid list. for (unsigned i = 0; i < unicode_to_new_gid_list.length; i++) { // Use raw array access for performance. unicode_to_new_gid_list.arrayZ[i].second = glyph_map->get(unicode_to_new_gid_list.arrayZ[i].second); } bounds_width_vec.resize (_num_output_glyphs, false); for (auto &v : bounds_width_vec) v = 0xFFFFFFFF; bounds_height_vec.resize (_num_output_glyphs, false); for (auto &v : bounds_height_vec) v = 0xFFFFFFFF; if (unlikely (in_error ())) return; #ifndef HB_NO_VAR _update_instance_metrics_map_from_cff2 (this); #endif if (attach_accelerator_data) { inprogress_accelerator = hb_subset_accelerator_t::create (source, *codepoint_to_glyph, unicodes, has_seac); check_success (inprogress_accelerator); } #define HB_SUBSET_PLAN_MEMBER(Type, Name) check_success (!Name.in_error ()); #include "hb-subset-plan-member-list.hh" #undef HB_SUBSET_PLAN_MEMBER } hb_subset_plan_t::~hb_subset_plan_t() { hb_face_destroy (dest); hb_map_destroy (codepoint_to_glyph); hb_map_destroy (glyph_map); hb_map_destroy (reverse_glyph_map); #ifndef HB_NO_SUBSET_CFF cff1_accel.fini (); cff2_accel.fini (); #endif hb_face_destroy (source); #ifdef HB_EXPERIMENTAL_API for (auto _ : name_table_overrides.iter_ref ()) _.second.fini (); #endif if (inprogress_accelerator) hb_subset_accelerator_t::destroy ((void*) inprogress_accelerator); } /** * hb_subset_plan_create_or_fail: * @face: font face to create the plan for. * @input: a #hb_subset_input_t input. * * Computes a plan for subsetting the supplied face according * to a provided input. The plan describes * which tables and glyphs should be retained. * * Return value: (transfer full): New subset plan. Destroy with * hb_subset_plan_destroy(). If there is a failure creating the plan * nullptr will be returned. * * Since: 4.0.0 **/ hb_subset_plan_t * hb_subset_plan_create_or_fail (hb_face_t *face, const hb_subset_input_t *input) { hb_subset_plan_t *plan; if (unlikely (!(plan = hb_object_create (face, input)))) return nullptr; if (unlikely (plan->in_error ())) { hb_subset_plan_destroy (plan); return nullptr; } return plan; } /** * hb_subset_plan_destroy: * @plan: a #hb_subset_plan_t * * Decreases the reference count on @plan, and if it reaches zero, destroys * @plan, freeing all memory. * * Since: 4.0.0 **/ void hb_subset_plan_destroy (hb_subset_plan_t *plan) { if (!hb_object_destroy (plan)) return; hb_free (plan); } /** * hb_subset_plan_old_to_new_glyph_mapping: * @plan: a subsetting plan. * * Returns the mapping between glyphs in the original font to glyphs in the * subset that will be produced by @plan * * Return value: (transfer none): * A pointer to the #hb_map_t of the mapping. * * Since: 4.0.0 **/ hb_map_t * hb_subset_plan_old_to_new_glyph_mapping (const hb_subset_plan_t *plan) { return plan->glyph_map; } /** * hb_subset_plan_new_to_old_glyph_mapping: * @plan: a subsetting plan. * * Returns the mapping between glyphs in the subset that will be produced by * @plan and the glyph in the original font. * * Return value: (transfer none): * A pointer to the #hb_map_t of the mapping. * * Since: 4.0.0 **/ hb_map_t * hb_subset_plan_new_to_old_glyph_mapping (const hb_subset_plan_t *plan) { return plan->reverse_glyph_map; } /** * hb_subset_plan_unicode_to_old_glyph_mapping: * @plan: a subsetting plan. * * Returns the mapping between codepoints in the original font and the * associated glyph id in the original font. * * Return value: (transfer none): * A pointer to the #hb_map_t of the mapping. * * Since: 4.0.0 **/ hb_map_t * hb_subset_plan_unicode_to_old_glyph_mapping (const hb_subset_plan_t *plan) { return plan->codepoint_to_glyph; } /** * hb_subset_plan_reference: (skip) * @plan: a #hb_subset_plan_t object. * * Increases the reference count on @plan. * * Return value: @plan. * * Since: 4.0.0 **/ hb_subset_plan_t * hb_subset_plan_reference (hb_subset_plan_t *plan) { return hb_object_reference (plan); } /** * hb_subset_plan_set_user_data: (skip) * @plan: a #hb_subset_plan_t object. * @key: The user-data key to set * @data: A pointer to the user data * @destroy: (nullable): A callback to call when @data is not needed anymore * @replace: Whether to replace an existing data with the same key * * Attaches a user-data key/data pair to the given subset plan object. * * Return value: `true` if success, `false` otherwise * * Since: 4.0.0 **/ hb_bool_t hb_subset_plan_set_user_data (hb_subset_plan_t *plan, hb_user_data_key_t *key, void *data, hb_destroy_func_t destroy, hb_bool_t replace) { return hb_object_set_user_data (plan, key, data, destroy, replace); } /** * hb_subset_plan_get_user_data: (skip) * @plan: a #hb_subset_plan_t object. * @key: The user-data key to query * * Fetches the user data associated with the specified key, * attached to the specified subset plan object. * * Return value: (transfer none): A pointer to the user data * * Since: 4.0.0 **/ void * hb_subset_plan_get_user_data (const hb_subset_plan_t *plan, hb_user_data_key_t *key) { return hb_object_get_user_data (plan, key); }