| /* |
| * Copyright © 2007,2008,2009,2010 Red Hat, Inc. |
| * Copyright © 2010,2012 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 |
| */ |
| |
| #ifndef HB_OT_LAYOUT_GSUBGPOS_HH |
| #define HB_OT_LAYOUT_GSUBGPOS_HH |
| |
| #include "hb.hh" |
| #include "hb-buffer.hh" |
| #include "hb-map.hh" |
| #include "hb-set.hh" |
| #include "hb-ot-map.hh" |
| #include "hb-ot-layout-common.hh" |
| #include "hb-ot-layout-gdef-table.hh" |
| |
| |
| namespace OT { |
| |
| |
| struct hb_intersects_context_t : |
| hb_dispatch_context_t<hb_intersects_context_t, bool> |
| { |
| template <typename T> |
| return_t dispatch (const T &obj) { return obj.intersects (this->glyphs); } |
| static return_t default_return_value () { return false; } |
| bool stop_sublookup_iteration (return_t r) const { return r; } |
| |
| const hb_set_t *glyphs; |
| |
| hb_intersects_context_t (const hb_set_t *glyphs_) : |
| glyphs (glyphs_) {} |
| }; |
| |
| struct hb_have_non_1to1_context_t : |
| hb_dispatch_context_t<hb_have_non_1to1_context_t, bool> |
| { |
| template <typename T> |
| return_t dispatch (const T &obj) { return obj.may_have_non_1to1 (); } |
| static return_t default_return_value () { return false; } |
| bool stop_sublookup_iteration (return_t r) const { return r; } |
| }; |
| |
| struct hb_closure_context_t : |
| hb_dispatch_context_t<hb_closure_context_t> |
| { |
| typedef return_t (*recurse_func_t) (hb_closure_context_t *c, unsigned lookup_index, hb_set_t *covered_seq_indicies, unsigned seq_index, unsigned end_index); |
| template <typename T> |
| return_t dispatch (const T &obj) { obj.closure (this); return hb_empty_t (); } |
| static return_t default_return_value () { return hb_empty_t (); } |
| void recurse (unsigned lookup_index, hb_set_t *covered_seq_indicies, unsigned seq_index, unsigned end_index) |
| { |
| if (unlikely (nesting_level_left == 0 || !recurse_func)) |
| return; |
| |
| nesting_level_left--; |
| recurse_func (this, lookup_index, covered_seq_indicies, seq_index, end_index); |
| nesting_level_left++; |
| } |
| |
| void reset_lookup_visit_count () |
| { lookup_count = 0; } |
| |
| bool lookup_limit_exceeded () |
| { return lookup_count > HB_MAX_LOOKUP_VISIT_COUNT; } |
| |
| bool should_visit_lookup (unsigned int lookup_index) |
| { |
| if (lookup_count++ > HB_MAX_LOOKUP_VISIT_COUNT) |
| return false; |
| |
| if (is_lookup_done (lookup_index)) |
| return false; |
| |
| return true; |
| } |
| |
| bool is_lookup_done (unsigned int lookup_index) |
| { |
| if (done_lookups_glyph_count->in_error () || |
| done_lookups_glyph_set->in_error ()) |
| return true; |
| |
| /* Have we visited this lookup with the current set of glyphs? */ |
| if (done_lookups_glyph_count->get (lookup_index) != glyphs->get_population ()) |
| { |
| done_lookups_glyph_count->set (lookup_index, glyphs->get_population ()); |
| |
| if (!done_lookups_glyph_set->has (lookup_index)) |
| { |
| if (unlikely (!done_lookups_glyph_set->set (lookup_index, hb::unique_ptr<hb_set_t> {hb_set_create ()}))) |
| return true; |
| } |
| |
| hb_set_clear (done_lookups_glyph_set->get (lookup_index)); |
| } |
| |
| hb_set_t *covered_glyph_set = done_lookups_glyph_set->get (lookup_index); |
| if (unlikely (covered_glyph_set->in_error ())) |
| return true; |
| if (parent_active_glyphs ().is_subset (*covered_glyph_set)) |
| return true; |
| |
| covered_glyph_set->union_ (parent_active_glyphs ()); |
| return false; |
| } |
| |
| const hb_set_t& previous_parent_active_glyphs () { |
| if (active_glyphs_stack.length <= 1) |
| return *glyphs; |
| |
| return active_glyphs_stack[active_glyphs_stack.length - 2]; |
| } |
| |
| const hb_set_t& parent_active_glyphs () |
| { |
| if (!active_glyphs_stack) |
| return *glyphs; |
| |
| return active_glyphs_stack.tail (); |
| } |
| |
| hb_set_t& push_cur_active_glyphs () |
| { |
| return *active_glyphs_stack.push (); |
| } |
| |
| bool pop_cur_done_glyphs () |
| { |
| if (active_glyphs_stack.length < 1) |
| return false; |
| |
| active_glyphs_stack.pop (); |
| return true; |
| } |
| |
| hb_face_t *face; |
| hb_set_t *glyphs; |
| hb_set_t output[1]; |
| hb_vector_t<hb_set_t> active_glyphs_stack; |
| recurse_func_t recurse_func = nullptr; |
| unsigned int nesting_level_left; |
| |
| hb_closure_context_t (hb_face_t *face_, |
| hb_set_t *glyphs_, |
| hb_map_t *done_lookups_glyph_count_, |
| hb_hashmap_t<unsigned, hb::unique_ptr<hb_set_t>> *done_lookups_glyph_set_, |
| unsigned int nesting_level_left_ = HB_MAX_NESTING_LEVEL) : |
| face (face_), |
| glyphs (glyphs_), |
| nesting_level_left (nesting_level_left_), |
| done_lookups_glyph_count (done_lookups_glyph_count_), |
| done_lookups_glyph_set (done_lookups_glyph_set_) |
| {} |
| |
| ~hb_closure_context_t () { flush (); } |
| |
| void set_recurse_func (recurse_func_t func) { recurse_func = func; } |
| |
| void flush () |
| { |
| output->del_range (face->get_num_glyphs (), HB_SET_VALUE_INVALID); /* Remove invalid glyphs. */ |
| glyphs->union_ (*output); |
| output->clear (); |
| active_glyphs_stack.pop (); |
| active_glyphs_stack.reset (); |
| } |
| |
| private: |
| hb_map_t *done_lookups_glyph_count; |
| hb_hashmap_t<unsigned, hb::unique_ptr<hb_set_t>> *done_lookups_glyph_set; |
| unsigned int lookup_count = 0; |
| }; |
| |
| |
| |
| struct hb_closure_lookups_context_t : |
| hb_dispatch_context_t<hb_closure_lookups_context_t> |
| { |
| typedef return_t (*recurse_func_t) (hb_closure_lookups_context_t *c, unsigned lookup_index); |
| template <typename T> |
| return_t dispatch (const T &obj) { obj.closure_lookups (this); return hb_empty_t (); } |
| static return_t default_return_value () { return hb_empty_t (); } |
| void recurse (unsigned lookup_index) |
| { |
| if (unlikely (nesting_level_left == 0 || !recurse_func)) |
| return; |
| |
| /* Return if new lookup was recursed to before. */ |
| if (lookup_limit_exceeded () |
| || visited_lookups->in_error () |
| || visited_lookups->has (lookup_index)) |
| // Don't increment lookup count here, that will be done in the call to closure_lookups() |
| // made by recurse_func. |
| return; |
| |
| nesting_level_left--; |
| recurse_func (this, lookup_index); |
| nesting_level_left++; |
| } |
| |
| void set_lookup_visited (unsigned lookup_index) |
| { visited_lookups->add (lookup_index); } |
| |
| void set_lookup_inactive (unsigned lookup_index) |
| { inactive_lookups->add (lookup_index); } |
| |
| bool lookup_limit_exceeded () |
| { |
| bool ret = lookup_count > HB_MAX_LOOKUP_VISIT_COUNT; |
| if (ret) |
| DEBUG_MSG (SUBSET, nullptr, "lookup visit count limit exceeded in lookup closure!"); |
| return ret; } |
| |
| bool is_lookup_visited (unsigned lookup_index) |
| { |
| if (unlikely (lookup_count++ > HB_MAX_LOOKUP_VISIT_COUNT)) |
| { |
| DEBUG_MSG (SUBSET, nullptr, "total visited lookup count %u exceeds max limit, lookup %u is dropped.", |
| lookup_count, lookup_index); |
| return true; |
| } |
| |
| if (unlikely (visited_lookups->in_error ())) |
| return true; |
| |
| return visited_lookups->has (lookup_index); |
| } |
| |
| hb_face_t *face; |
| const hb_set_t *glyphs; |
| recurse_func_t recurse_func; |
| unsigned int nesting_level_left; |
| |
| hb_closure_lookups_context_t (hb_face_t *face_, |
| const hb_set_t *glyphs_, |
| hb_set_t *visited_lookups_, |
| hb_set_t *inactive_lookups_, |
| unsigned nesting_level_left_ = HB_MAX_NESTING_LEVEL) : |
| face (face_), |
| glyphs (glyphs_), |
| recurse_func (nullptr), |
| nesting_level_left (nesting_level_left_), |
| visited_lookups (visited_lookups_), |
| inactive_lookups (inactive_lookups_), |
| lookup_count (0) {} |
| |
| void set_recurse_func (recurse_func_t func) { recurse_func = func; } |
| |
| private: |
| hb_set_t *visited_lookups; |
| hb_set_t *inactive_lookups; |
| unsigned int lookup_count; |
| }; |
| |
| struct hb_would_apply_context_t : |
| hb_dispatch_context_t<hb_would_apply_context_t, bool> |
| { |
| template <typename T> |
| return_t dispatch (const T &obj) { return obj.would_apply (this); } |
| static return_t default_return_value () { return false; } |
| bool stop_sublookup_iteration (return_t r) const { return r; } |
| |
| hb_face_t *face; |
| const hb_codepoint_t *glyphs; |
| unsigned int len; |
| bool zero_context; |
| |
| hb_would_apply_context_t (hb_face_t *face_, |
| const hb_codepoint_t *glyphs_, |
| unsigned int len_, |
| bool zero_context_) : |
| face (face_), |
| glyphs (glyphs_), |
| len (len_), |
| zero_context (zero_context_) {} |
| }; |
| |
| struct hb_collect_glyphs_context_t : |
| hb_dispatch_context_t<hb_collect_glyphs_context_t> |
| { |
| typedef return_t (*recurse_func_t) (hb_collect_glyphs_context_t *c, unsigned int lookup_index); |
| template <typename T> |
| return_t dispatch (const T &obj) { obj.collect_glyphs (this); return hb_empty_t (); } |
| static return_t default_return_value () { return hb_empty_t (); } |
| void recurse (unsigned int lookup_index) |
| { |
| if (unlikely (nesting_level_left == 0 || !recurse_func)) |
| return; |
| |
| /* Note that GPOS sets recurse_func to nullptr already, so it doesn't get |
| * past the previous check. For GSUB, we only want to collect the output |
| * glyphs in the recursion. If output is not requested, we can go home now. |
| * |
| * Note further, that the above is not exactly correct. A recursed lookup |
| * is allowed to match input that is not matched in the context, but that's |
| * not how most fonts are built. It's possible to relax that and recurse |
| * with all sets here if it proves to be an issue. |
| */ |
| |
| if (output == hb_set_get_empty ()) |
| return; |
| |
| /* Return if new lookup was recursed to before. */ |
| if (recursed_lookups->has (lookup_index)) |
| return; |
| |
| hb_set_t *old_before = before; |
| hb_set_t *old_input = input; |
| hb_set_t *old_after = after; |
| before = input = after = hb_set_get_empty (); |
| |
| nesting_level_left--; |
| recurse_func (this, lookup_index); |
| nesting_level_left++; |
| |
| before = old_before; |
| input = old_input; |
| after = old_after; |
| |
| recursed_lookups->add (lookup_index); |
| } |
| |
| hb_face_t *face; |
| hb_set_t *before; |
| hb_set_t *input; |
| hb_set_t *after; |
| hb_set_t *output; |
| recurse_func_t recurse_func; |
| hb_set_t *recursed_lookups; |
| unsigned int nesting_level_left; |
| |
| hb_collect_glyphs_context_t (hb_face_t *face_, |
| hb_set_t *glyphs_before, /* OUT. May be NULL */ |
| hb_set_t *glyphs_input, /* OUT. May be NULL */ |
| hb_set_t *glyphs_after, /* OUT. May be NULL */ |
| hb_set_t *glyphs_output, /* OUT. May be NULL */ |
| unsigned int nesting_level_left_ = HB_MAX_NESTING_LEVEL) : |
| face (face_), |
| before (glyphs_before ? glyphs_before : hb_set_get_empty ()), |
| input (glyphs_input ? glyphs_input : hb_set_get_empty ()), |
| after (glyphs_after ? glyphs_after : hb_set_get_empty ()), |
| output (glyphs_output ? glyphs_output : hb_set_get_empty ()), |
| recurse_func (nullptr), |
| recursed_lookups (hb_set_create ()), |
| nesting_level_left (nesting_level_left_) {} |
| ~hb_collect_glyphs_context_t () { hb_set_destroy (recursed_lookups); } |
| |
| void set_recurse_func (recurse_func_t func) { recurse_func = func; } |
| }; |
| |
| |
| |
| template <typename set_t> |
| struct hb_collect_coverage_context_t : |
| hb_dispatch_context_t<hb_collect_coverage_context_t<set_t>, const Coverage &> |
| { |
| typedef const Coverage &return_t; // Stoopid that we have to dupe this here. |
| template <typename T> |
| return_t dispatch (const T &obj) { return obj.get_coverage (); } |
| static return_t default_return_value () { return Null (Coverage); } |
| bool stop_sublookup_iteration (return_t r) const |
| { |
| r.collect_coverage (set); |
| return false; |
| } |
| |
| hb_collect_coverage_context_t (set_t *set_) : |
| set (set_) {} |
| |
| set_t *set; |
| }; |
| |
| struct hb_ot_apply_context_t : |
| hb_dispatch_context_t<hb_ot_apply_context_t, bool, HB_DEBUG_APPLY> |
| { |
| struct matcher_t |
| { |
| matcher_t () : |
| lookup_props (0), |
| mask (-1), |
| ignore_zwnj (false), |
| ignore_zwj (false), |
| per_syllable (false), |
| syllable {0}, |
| match_func (nullptr), |
| match_data (nullptr) {} |
| |
| typedef bool (*match_func_t) (hb_glyph_info_t &info, unsigned value, const void *data); |
| |
| void set_ignore_zwnj (bool ignore_zwnj_) { ignore_zwnj = ignore_zwnj_; } |
| void set_ignore_zwj (bool ignore_zwj_) { ignore_zwj = ignore_zwj_; } |
| void set_lookup_props (unsigned int lookup_props_) { lookup_props = lookup_props_; } |
| void set_mask (hb_mask_t mask_) { mask = mask_; } |
| void set_per_syllable (bool per_syllable_) { per_syllable = per_syllable_; } |
| void set_syllable (uint8_t syllable_) { syllable = per_syllable ? syllable_ : 0; } |
| void set_match_func (match_func_t match_func_, |
| const void *match_data_) |
| { match_func = match_func_; match_data = match_data_; } |
| |
| enum may_match_t { |
| MATCH_NO, |
| MATCH_YES, |
| MATCH_MAYBE |
| }; |
| |
| may_match_t may_match (hb_glyph_info_t &info, |
| hb_codepoint_t glyph_data) const |
| { |
| if (!(info.mask & mask) || |
| (syllable && syllable != info.syllable ())) |
| return MATCH_NO; |
| |
| if (match_func) |
| return match_func (info, glyph_data, match_data) ? MATCH_YES : MATCH_NO; |
| |
| return MATCH_MAYBE; |
| } |
| |
| enum may_skip_t { |
| SKIP_NO, |
| SKIP_YES, |
| SKIP_MAYBE |
| }; |
| |
| may_skip_t may_skip (const hb_ot_apply_context_t *c, |
| const hb_glyph_info_t &info) const |
| { |
| if (!c->check_glyph_property (&info, lookup_props)) |
| return SKIP_YES; |
| |
| if (unlikely (_hb_glyph_info_is_default_ignorable_and_not_hidden (&info) && |
| (ignore_zwnj || !_hb_glyph_info_is_zwnj (&info)) && |
| (ignore_zwj || !_hb_glyph_info_is_zwj (&info)))) |
| return SKIP_MAYBE; |
| |
| return SKIP_NO; |
| } |
| |
| protected: |
| unsigned int lookup_props; |
| hb_mask_t mask; |
| bool ignore_zwnj; |
| bool ignore_zwj; |
| bool per_syllable; |
| uint8_t syllable; |
| match_func_t match_func; |
| const void *match_data; |
| }; |
| |
| struct skipping_iterator_t |
| { |
| void init (hb_ot_apply_context_t *c_, bool context_match = false) |
| { |
| c = c_; |
| match_glyph_data16 = nullptr; |
| #ifndef HB_NO_BORING_EXPANSION |
| match_glyph_data24 = nullptr; |
| #endif |
| matcher.set_match_func (nullptr, nullptr); |
| matcher.set_lookup_props (c->lookup_props); |
| /* Ignore ZWNJ if we are matching GPOS, or matching GSUB context and asked to. */ |
| matcher.set_ignore_zwnj (c->table_index == 1 || (context_match && c->auto_zwnj)); |
| /* Ignore ZWJ if we are matching context, or asked to. */ |
| matcher.set_ignore_zwj (context_match || c->auto_zwj); |
| matcher.set_mask (context_match ? -1 : c->lookup_mask); |
| matcher.set_per_syllable (c->per_syllable); |
| } |
| void set_lookup_props (unsigned int lookup_props) |
| { |
| matcher.set_lookup_props (lookup_props); |
| } |
| void set_match_func (matcher_t::match_func_t match_func_, |
| const void *match_data_) |
| { |
| matcher.set_match_func (match_func_, match_data_); |
| } |
| void set_glyph_data (const HBUINT16 glyph_data[]) |
| { |
| match_glyph_data16 = glyph_data; |
| #ifndef HB_NO_BORING_EXPANSION |
| match_glyph_data24 = nullptr; |
| #endif |
| } |
| #ifndef HB_NO_BORING_EXPANSION |
| void set_glyph_data (const HBUINT24 glyph_data[]) |
| { |
| match_glyph_data16 = nullptr; |
| match_glyph_data24 = glyph_data; |
| } |
| #endif |
| |
| void reset (unsigned int start_index_, |
| unsigned int num_items_) |
| { |
| idx = start_index_; |
| num_items = num_items_; |
| end = c->buffer->len; |
| matcher.set_syllable (start_index_ == c->buffer->idx ? c->buffer->cur().syllable () : 0); |
| } |
| |
| void reject () |
| { |
| num_items++; |
| backup_glyph_data (); |
| } |
| |
| matcher_t::may_skip_t |
| may_skip (const hb_glyph_info_t &info) const |
| { return matcher.may_skip (c, info); } |
| |
| bool next (unsigned *unsafe_to = nullptr) |
| { |
| assert (num_items > 0); |
| while (idx + num_items < end) |
| { |
| idx++; |
| hb_glyph_info_t &info = c->buffer->info[idx]; |
| |
| matcher_t::may_skip_t skip = matcher.may_skip (c, info); |
| if (unlikely (skip == matcher_t::SKIP_YES)) |
| continue; |
| |
| matcher_t::may_match_t match = matcher.may_match (info, get_glyph_data ()); |
| if (match == matcher_t::MATCH_YES || |
| (match == matcher_t::MATCH_MAYBE && |
| skip == matcher_t::SKIP_NO)) |
| { |
| num_items--; |
| advance_glyph_data (); |
| return true; |
| } |
| |
| if (skip == matcher_t::SKIP_NO) |
| { |
| if (unsafe_to) |
| *unsafe_to = idx + 1; |
| return false; |
| } |
| } |
| if (unsafe_to) |
| *unsafe_to = end; |
| return false; |
| } |
| bool prev (unsigned *unsafe_from = nullptr) |
| { |
| assert (num_items > 0); |
| while (idx > num_items - 1) |
| { |
| idx--; |
| hb_glyph_info_t &info = c->buffer->out_info[idx]; |
| |
| matcher_t::may_skip_t skip = matcher.may_skip (c, info); |
| if (unlikely (skip == matcher_t::SKIP_YES)) |
| continue; |
| |
| matcher_t::may_match_t match = matcher.may_match (info, get_glyph_data ()); |
| if (match == matcher_t::MATCH_YES || |
| (match == matcher_t::MATCH_MAYBE && |
| skip == matcher_t::SKIP_NO)) |
| { |
| num_items--; |
| advance_glyph_data (); |
| return true; |
| } |
| |
| if (skip == matcher_t::SKIP_NO) |
| { |
| if (unsafe_from) |
| *unsafe_from = hb_max (1u, idx) - 1u; |
| return false; |
| } |
| } |
| if (unsafe_from) |
| *unsafe_from = 0; |
| return false; |
| } |
| |
| hb_codepoint_t |
| get_glyph_data () |
| { |
| if (match_glyph_data16) return *match_glyph_data16; |
| #ifndef HB_NO_BORING_EXPANSION |
| else |
| if (match_glyph_data24) return *match_glyph_data24; |
| #endif |
| return 0; |
| } |
| void |
| advance_glyph_data () |
| { |
| if (match_glyph_data16) match_glyph_data16++; |
| #ifndef HB_NO_BORING_EXPANSION |
| else |
| if (match_glyph_data24) match_glyph_data24++; |
| #endif |
| } |
| void |
| backup_glyph_data () |
| { |
| if (match_glyph_data16) match_glyph_data16--; |
| #ifndef HB_NO_BORING_EXPANSION |
| else |
| if (match_glyph_data24) match_glyph_data24--; |
| #endif |
| } |
| |
| unsigned int idx; |
| protected: |
| hb_ot_apply_context_t *c; |
| matcher_t matcher; |
| const HBUINT16 *match_glyph_data16; |
| #ifndef HB_NO_BORING_EXPANSION |
| const HBUINT24 *match_glyph_data24; |
| #endif |
| |
| unsigned int num_items; |
| unsigned int end; |
| }; |
| |
| |
| const char *get_name () { return "APPLY"; } |
| typedef return_t (*recurse_func_t) (hb_ot_apply_context_t *c, unsigned int lookup_index); |
| template <typename T> |
| return_t dispatch (const T &obj) { return obj.apply (this); } |
| static return_t default_return_value () { return false; } |
| bool stop_sublookup_iteration (return_t r) const { return r; } |
| return_t recurse (unsigned int sub_lookup_index) |
| { |
| if (unlikely (nesting_level_left == 0 || !recurse_func || buffer->max_ops-- <= 0)) |
| { |
| buffer->shaping_failed = true; |
| return default_return_value (); |
| } |
| |
| nesting_level_left--; |
| bool ret = recurse_func (this, sub_lookup_index); |
| nesting_level_left++; |
| return ret; |
| } |
| |
| skipping_iterator_t iter_input, iter_context; |
| |
| unsigned int table_index; /* GSUB/GPOS */ |
| hb_font_t *font; |
| hb_face_t *face; |
| hb_buffer_t *buffer; |
| recurse_func_t recurse_func = nullptr; |
| const GDEF &gdef; |
| const VariationStore &var_store; |
| VariationStore::cache_t *var_store_cache; |
| |
| hb_direction_t direction; |
| hb_mask_t lookup_mask = 1; |
| unsigned int lookup_index = (unsigned) -1; |
| unsigned int lookup_props = 0; |
| unsigned int nesting_level_left = HB_MAX_NESTING_LEVEL; |
| |
| bool has_glyph_classes; |
| bool auto_zwnj = true; |
| bool auto_zwj = true; |
| bool per_syllable = false; |
| bool random = false; |
| uint32_t random_state = 1; |
| unsigned new_syllables = (unsigned) -1; |
| |
| hb_ot_apply_context_t (unsigned int table_index_, |
| hb_font_t *font_, |
| hb_buffer_t *buffer_) : |
| table_index (table_index_), |
| font (font_), face (font->face), buffer (buffer_), |
| gdef ( |
| #ifndef HB_NO_OT_LAYOUT |
| *face->table.GDEF->table |
| #else |
| Null (GDEF) |
| #endif |
| ), |
| var_store (gdef.get_var_store ()), |
| var_store_cache ( |
| #ifndef HB_NO_VAR |
| table_index == 1 && font->num_coords ? var_store.create_cache () : nullptr |
| #else |
| nullptr |
| #endif |
| ), |
| direction (buffer_->props.direction), |
| has_glyph_classes (gdef.has_glyph_classes ()) |
| { init_iters (); } |
| |
| ~hb_ot_apply_context_t () |
| { |
| #ifndef HB_NO_VAR |
| VariationStore::destroy_cache (var_store_cache); |
| #endif |
| } |
| |
| void init_iters () |
| { |
| iter_input.init (this, false); |
| iter_context.init (this, true); |
| } |
| |
| void set_lookup_mask (hb_mask_t mask) { lookup_mask = mask; init_iters (); } |
| void set_auto_zwj (bool auto_zwj_) { auto_zwj = auto_zwj_; init_iters (); } |
| void set_auto_zwnj (bool auto_zwnj_) { auto_zwnj = auto_zwnj_; init_iters (); } |
| void set_per_syllable (bool per_syllable_) { per_syllable = per_syllable_; init_iters (); } |
| void set_random (bool random_) { random = random_; } |
| void set_recurse_func (recurse_func_t func) { recurse_func = func; } |
| void set_lookup_index (unsigned int lookup_index_) { lookup_index = lookup_index_; } |
| void set_lookup_props (unsigned int lookup_props_) { lookup_props = lookup_props_; init_iters (); } |
| |
| uint32_t random_number () |
| { |
| /* http://www.cplusplus.com/reference/random/minstd_rand/ */ |
| random_state = random_state * 48271 % 2147483647; |
| return random_state; |
| } |
| |
| bool match_properties_mark (hb_codepoint_t glyph, |
| unsigned int glyph_props, |
| unsigned int match_props) const |
| { |
| /* If using mark filtering sets, the high short of |
| * match_props has the set index. |
| */ |
| if (match_props & LookupFlag::UseMarkFilteringSet) |
| return gdef.mark_set_covers (match_props >> 16, glyph); |
| |
| /* The second byte of match_props has the meaning |
| * "ignore marks of attachment type different than |
| * the attachment type specified." |
| */ |
| if (match_props & LookupFlag::MarkAttachmentType) |
| return (match_props & LookupFlag::MarkAttachmentType) == (glyph_props & LookupFlag::MarkAttachmentType); |
| |
| return true; |
| } |
| |
| bool check_glyph_property (const hb_glyph_info_t *info, |
| unsigned int match_props) const |
| { |
| hb_codepoint_t glyph = info->codepoint; |
| unsigned int glyph_props = _hb_glyph_info_get_glyph_props (info); |
| |
| /* Not covered, if, for example, glyph class is ligature and |
| * match_props includes LookupFlags::IgnoreLigatures |
| */ |
| if (glyph_props & match_props & LookupFlag::IgnoreFlags) |
| return false; |
| |
| if (unlikely (glyph_props & HB_OT_LAYOUT_GLYPH_PROPS_MARK)) |
| return match_properties_mark (glyph, glyph_props, match_props); |
| |
| return true; |
| } |
| |
| void _set_glyph_class (hb_codepoint_t glyph_index, |
| unsigned int class_guess = 0, |
| bool ligature = false, |
| bool component = false) const |
| { |
| if (new_syllables != (unsigned) -1) |
| buffer->cur().syllable() = new_syllables; |
| |
| unsigned int props = _hb_glyph_info_get_glyph_props (&buffer->cur()); |
| props |= HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED; |
| if (ligature) |
| { |
| props |= HB_OT_LAYOUT_GLYPH_PROPS_LIGATED; |
| /* In the only place that the MULTIPLIED bit is used, Uniscribe |
| * seems to only care about the "last" transformation between |
| * Ligature and Multiple substitutions. Ie. if you ligate, expand, |
| * and ligate again, it forgives the multiplication and acts as |
| * if only ligation happened. As such, clear MULTIPLIED bit. |
| */ |
| props &= ~HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED; |
| } |
| if (component) |
| props |= HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED; |
| if (likely (has_glyph_classes)) |
| { |
| props &= HB_OT_LAYOUT_GLYPH_PROPS_PRESERVE; |
| _hb_glyph_info_set_glyph_props (&buffer->cur(), props | gdef.get_glyph_props (glyph_index)); |
| } |
| else if (class_guess) |
| { |
| props &= HB_OT_LAYOUT_GLYPH_PROPS_PRESERVE; |
| _hb_glyph_info_set_glyph_props (&buffer->cur(), props | class_guess); |
| } |
| else |
| _hb_glyph_info_set_glyph_props (&buffer->cur(), props); |
| } |
| |
| void replace_glyph (hb_codepoint_t glyph_index) const |
| { |
| _set_glyph_class (glyph_index); |
| (void) buffer->replace_glyph (glyph_index); |
| } |
| void replace_glyph_inplace (hb_codepoint_t glyph_index) const |
| { |
| _set_glyph_class (glyph_index); |
| buffer->cur().codepoint = glyph_index; |
| } |
| void replace_glyph_with_ligature (hb_codepoint_t glyph_index, |
| unsigned int class_guess) const |
| { |
| _set_glyph_class (glyph_index, class_guess, true); |
| (void) buffer->replace_glyph (glyph_index); |
| } |
| void output_glyph_for_component (hb_codepoint_t glyph_index, |
| unsigned int class_guess) const |
| { |
| _set_glyph_class (glyph_index, class_guess, false, true); |
| (void) buffer->output_glyph (glyph_index); |
| } |
| }; |
| |
| |
| struct hb_accelerate_subtables_context_t : |
| hb_dispatch_context_t<hb_accelerate_subtables_context_t> |
| { |
| template <typename Type> |
| static inline bool apply_to (const void *obj, OT::hb_ot_apply_context_t *c) |
| { |
| const Type *typed_obj = (const Type *) obj; |
| return typed_obj->apply (c); |
| } |
| |
| #ifndef HB_NO_OT_LAYOUT_LOOKUP_CACHE |
| template <typename T> |
| static inline auto apply_cached_ (const T *obj, OT::hb_ot_apply_context_t *c, hb_priority<1>) HB_RETURN (bool, obj->apply (c, true) ) |
| template <typename T> |
| static inline auto apply_cached_ (const T *obj, OT::hb_ot_apply_context_t *c, hb_priority<0>) HB_RETURN (bool, obj->apply (c) ) |
| template <typename Type> |
| static inline bool apply_cached_to (const void *obj, OT::hb_ot_apply_context_t *c) |
| { |
| const Type *typed_obj = (const Type *) obj; |
| return apply_cached_ (typed_obj, c, hb_prioritize); |
| } |
| |
| template <typename T> |
| static inline auto cache_func_ (const T *obj, OT::hb_ot_apply_context_t *c, bool enter, hb_priority<1>) HB_RETURN (bool, obj->cache_func (c, enter) ) |
| template <typename T> |
| static inline bool cache_func_ (const T *obj, OT::hb_ot_apply_context_t *c, bool enter, hb_priority<0>) { return false; } |
| template <typename Type> |
| static inline bool cache_func_to (const void *obj, OT::hb_ot_apply_context_t *c, bool enter) |
| { |
| const Type *typed_obj = (const Type *) obj; |
| return cache_func_ (typed_obj, c, enter, hb_prioritize); |
| } |
| #endif |
| |
| typedef bool (*hb_apply_func_t) (const void *obj, OT::hb_ot_apply_context_t *c); |
| typedef bool (*hb_cache_func_t) (const void *obj, OT::hb_ot_apply_context_t *c, bool enter); |
| |
| struct hb_applicable_t |
| { |
| friend struct hb_accelerate_subtables_context_t; |
| friend struct hb_ot_layout_lookup_accelerator_t; |
| |
| template <typename T> |
| void init (const T &obj_, |
| hb_apply_func_t apply_func_ |
| #ifndef HB_NO_OT_LAYOUT_LOOKUP_CACHE |
| , hb_apply_func_t apply_cached_func_ |
| , hb_cache_func_t cache_func_ |
| #endif |
| ) |
| { |
| obj = &obj_; |
| apply_func = apply_func_; |
| #ifndef HB_NO_OT_LAYOUT_LOOKUP_CACHE |
| apply_cached_func = apply_cached_func_; |
| cache_func = cache_func_; |
| #endif |
| digest.init (); |
| obj_.get_coverage ().collect_coverage (&digest); |
| } |
| |
| bool apply (OT::hb_ot_apply_context_t *c) const |
| { |
| return digest.may_have (c->buffer->cur().codepoint) && apply_func (obj, c); |
| } |
| #ifndef HB_NO_OT_LAYOUT_LOOKUP_CACHE |
| bool apply_cached (OT::hb_ot_apply_context_t *c) const |
| { |
| return digest.may_have (c->buffer->cur().codepoint) && apply_cached_func (obj, c); |
| } |
| bool cache_enter (OT::hb_ot_apply_context_t *c) const |
| { |
| return cache_func (obj, c, true); |
| } |
| void cache_leave (OT::hb_ot_apply_context_t *c) const |
| { |
| cache_func (obj, c, false); |
| } |
| #endif |
| |
| private: |
| const void *obj; |
| hb_apply_func_t apply_func; |
| #ifndef HB_NO_OT_LAYOUT_LOOKUP_CACHE |
| hb_apply_func_t apply_cached_func; |
| hb_cache_func_t cache_func; |
| #endif |
| hb_set_digest_t digest; |
| }; |
| |
| typedef hb_vector_t<hb_applicable_t> array_t; |
| |
| #ifndef HB_NO_OT_LAYOUT_LOOKUP_CACHE |
| template <typename T> |
| auto cache_cost (const T &obj, hb_priority<1>) HB_AUTO_RETURN ( obj.cache_cost () ) |
| template <typename T> |
| auto cache_cost (const T &obj, hb_priority<0>) HB_AUTO_RETURN ( 0u ) |
| #endif |
| |
| /* Dispatch interface. */ |
| template <typename T> |
| return_t dispatch (const T &obj) |
| { |
| hb_applicable_t entry; |
| |
| entry.init (obj, |
| apply_to<T> |
| #ifndef HB_NO_OT_LAYOUT_LOOKUP_CACHE |
| , apply_cached_to<T> |
| , cache_func_to<T> |
| #endif |
| ); |
| |
| array.push (entry); |
| |
| #ifndef HB_NO_OT_LAYOUT_LOOKUP_CACHE |
| /* Cache handling |
| * |
| * We allow one subtable from each lookup to use a cache. The assumption |
| * being that multiple subtables of the same lookup cannot use a cache |
| * because the resources they would use will collide. As such, we ask |
| * each subtable to tell us how much it costs (which a cache would avoid), |
| * and we allocate the cache opportunity to the costliest subtable. |
| */ |
| unsigned cost = cache_cost (obj, hb_prioritize); |
| if (cost > cache_user_cost && !array.in_error ()) |
| { |
| cache_user_idx = array.length - 1; |
| cache_user_cost = cost; |
| } |
| #endif |
| |
| return hb_empty_t (); |
| } |
| static return_t default_return_value () { return hb_empty_t (); } |
| |
| hb_accelerate_subtables_context_t (array_t &array_) : |
| array (array_) {} |
| |
| array_t &array; |
| |
| #ifndef HB_NO_OT_LAYOUT_LOOKUP_CACHE |
| unsigned cache_user_idx = (unsigned) -1; |
| unsigned cache_user_cost = 0; |
| #endif |
| }; |
| |
| |
| typedef bool (*intersects_func_t) (const hb_set_t *glyphs, unsigned value, const void *data); |
| typedef void (*intersected_glyphs_func_t) (const hb_set_t *glyphs, const void *data, unsigned value, hb_set_t *intersected_glyphs); |
| typedef void (*collect_glyphs_func_t) (hb_set_t *glyphs, unsigned value, const void *data); |
| typedef bool (*match_func_t) (hb_glyph_info_t &info, unsigned value, const void *data); |
| |
| struct ContextClosureFuncs |
| { |
| intersects_func_t intersects; |
| intersected_glyphs_func_t intersected_glyphs; |
| }; |
| struct ContextCollectGlyphsFuncs |
| { |
| collect_glyphs_func_t collect; |
| }; |
| struct ContextApplyFuncs |
| { |
| match_func_t match; |
| }; |
| struct ChainContextApplyFuncs |
| { |
| match_func_t match[3]; |
| }; |
| |
| |
| static inline bool intersects_glyph (const hb_set_t *glyphs, unsigned value, const void *data HB_UNUSED) |
| { |
| return glyphs->has (value); |
| } |
| static inline bool intersects_class (const hb_set_t *glyphs, unsigned value, const void *data) |
| { |
| const ClassDef &class_def = *reinterpret_cast<const ClassDef *>(data); |
| return class_def.intersects_class (glyphs, value); |
| } |
| static inline bool intersects_coverage (const hb_set_t *glyphs, unsigned value, const void *data) |
| { |
| Offset16To<Coverage> coverage; |
| coverage = value; |
| return (data+coverage).intersects (glyphs); |
| } |
| |
| |
| static inline void intersected_glyph (const hb_set_t *glyphs HB_UNUSED, const void *data, unsigned value, hb_set_t *intersected_glyphs) |
| { |
| unsigned g = reinterpret_cast<const HBUINT16 *>(data)[value]; |
| intersected_glyphs->add (g); |
| } |
| static inline void intersected_class_glyphs (const hb_set_t *glyphs, const void *data, unsigned value, hb_set_t *intersected_glyphs) |
| { |
| const ClassDef &class_def = *reinterpret_cast<const ClassDef *>(data); |
| class_def.intersected_class_glyphs (glyphs, value, intersected_glyphs); |
| } |
| static inline void intersected_coverage_glyphs (const hb_set_t *glyphs, const void *data, unsigned value, hb_set_t *intersected_glyphs) |
| { |
| Offset16To<Coverage> coverage; |
| coverage = value; |
| (data+coverage).intersected_coverage_glyphs (glyphs, intersected_glyphs); |
| } |
| |
| |
| template <typename HBUINT> |
| static inline bool array_is_subset_of (const hb_set_t *glyphs, |
| unsigned int count, |
| const HBUINT values[], |
| intersects_func_t intersects_func, |
| const void *intersects_data) |
| { |
| for (const auto &_ : + hb_iter (values, count)) |
| if (!intersects_func (glyphs, _, intersects_data)) return false; |
| return true; |
| } |
| |
| |
| static inline void collect_glyph (hb_set_t *glyphs, unsigned value, const void *data HB_UNUSED) |
| { |
| glyphs->add (value); |
| } |
| static inline void collect_class (hb_set_t *glyphs, unsigned value, const void *data) |
| { |
| const ClassDef &class_def = *reinterpret_cast<const ClassDef *>(data); |
| class_def.collect_class (glyphs, value); |
| } |
| static inline void collect_coverage (hb_set_t *glyphs, unsigned value, const void *data) |
| { |
| Offset16To<Coverage> coverage; |
| coverage = value; |
| (data+coverage).collect_coverage (glyphs); |
| } |
| template <typename HBUINT> |
| static inline void collect_array (hb_collect_glyphs_context_t *c HB_UNUSED, |
| hb_set_t *glyphs, |
| unsigned int count, |
| const HBUINT values[], |
| collect_glyphs_func_t collect_func, |
| const void *collect_data) |
| { |
| return |
| + hb_iter (values, count) |
| | hb_apply ([&] (const HBUINT &_) { collect_func (glyphs, _, collect_data); }) |
| ; |
| } |
| |
| |
| static inline bool match_glyph (hb_glyph_info_t &info, unsigned value, const void *data HB_UNUSED) |
| { |
| return info.codepoint == value; |
| } |
| static inline bool match_class (hb_glyph_info_t &info, unsigned value, const void *data) |
| { |
| const ClassDef &class_def = *reinterpret_cast<const ClassDef *>(data); |
| return class_def.get_class (info.codepoint) == value; |
| } |
| static inline bool match_class_cached (hb_glyph_info_t &info, unsigned value, const void *data) |
| { |
| unsigned klass = info.syllable(); |
| if (klass < 255) |
| return klass == value; |
| const ClassDef &class_def = *reinterpret_cast<const ClassDef *>(data); |
| klass = class_def.get_class (info.codepoint); |
| if (likely (klass < 255)) |
| info.syllable() = klass; |
| return klass == value; |
| } |
| static inline bool match_coverage (hb_glyph_info_t &info, unsigned value, const void *data) |
| { |
| Offset16To<Coverage> coverage; |
| coverage = value; |
| return (data+coverage).get_coverage (info.codepoint) != NOT_COVERED; |
| } |
| |
| template <typename HBUINT> |
| static inline bool would_match_input (hb_would_apply_context_t *c, |
| unsigned int count, /* Including the first glyph (not matched) */ |
| const HBUINT input[], /* Array of input values--start with second glyph */ |
| match_func_t match_func, |
| const void *match_data) |
| { |
| if (count != c->len) |
| return false; |
| |
| for (unsigned int i = 1; i < count; i++) |
| { |
| hb_glyph_info_t info; |
| info.codepoint = c->glyphs[i]; |
| if (likely (!match_func (info, input[i - 1], match_data))) |
| return false; |
| } |
| |
| return true; |
| } |
| template <typename HBUINT> |
| static inline bool match_input (hb_ot_apply_context_t *c, |
| unsigned int count, /* Including the first glyph (not matched) */ |
| const HBUINT input[], /* Array of input values--start with second glyph */ |
| match_func_t match_func, |
| const void *match_data, |
| unsigned int *end_position, |
| unsigned int match_positions[HB_MAX_CONTEXT_LENGTH], |
| unsigned int *p_total_component_count = nullptr) |
| { |
| TRACE_APPLY (nullptr); |
| |
| if (unlikely (count > HB_MAX_CONTEXT_LENGTH)) return_trace (false); |
| |
| hb_buffer_t *buffer = c->buffer; |
| |
| hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_input; |
| skippy_iter.reset (buffer->idx, count - 1); |
| skippy_iter.set_match_func (match_func, match_data); |
| skippy_iter.set_glyph_data (input); |
| |
| /* |
| * This is perhaps the trickiest part of OpenType... Remarks: |
| * |
| * - If all components of the ligature were marks, we call this a mark ligature. |
| * |
| * - If there is no GDEF, and the ligature is NOT a mark ligature, we categorize |
| * it as a ligature glyph. |
| * |
| * - Ligatures cannot be formed across glyphs attached to different components |
| * of previous ligatures. Eg. the sequence is LAM,SHADDA,LAM,FATHA,HEH, and |
| * LAM,LAM,HEH form a ligature, leaving SHADDA,FATHA next to eachother. |
| * However, it would be wrong to ligate that SHADDA,FATHA sequence. |
| * There are a couple of exceptions to this: |
| * |
| * o If a ligature tries ligating with marks that belong to it itself, go ahead, |
| * assuming that the font designer knows what they are doing (otherwise it can |
| * break Indic stuff when a matra wants to ligate with a conjunct, |
| * |
| * o If two marks want to ligate and they belong to different components of the |
| * same ligature glyph, and said ligature glyph is to be ignored according to |
| * mark-filtering rules, then allow. |
| * https://github.com/harfbuzz/harfbuzz/issues/545 |
| */ |
| |
| unsigned int total_component_count = 0; |
| total_component_count += _hb_glyph_info_get_lig_num_comps (&buffer->cur()); |
| |
| unsigned int first_lig_id = _hb_glyph_info_get_lig_id (&buffer->cur()); |
| unsigned int first_lig_comp = _hb_glyph_info_get_lig_comp (&buffer->cur()); |
| |
| enum { |
| LIGBASE_NOT_CHECKED, |
| LIGBASE_MAY_NOT_SKIP, |
| LIGBASE_MAY_SKIP |
| } ligbase = LIGBASE_NOT_CHECKED; |
| |
| match_positions[0] = buffer->idx; |
| for (unsigned int i = 1; i < count; i++) |
| { |
| unsigned unsafe_to; |
| if (!skippy_iter.next (&unsafe_to)) |
| { |
| *end_position = unsafe_to; |
| return_trace (false); |
| } |
| |
| match_positions[i] = skippy_iter.idx; |
| |
| unsigned int this_lig_id = _hb_glyph_info_get_lig_id (&buffer->info[skippy_iter.idx]); |
| unsigned int this_lig_comp = _hb_glyph_info_get_lig_comp (&buffer->info[skippy_iter.idx]); |
| |
| if (first_lig_id && first_lig_comp) |
| { |
| /* If first component was attached to a previous ligature component, |
| * all subsequent components should be attached to the same ligature |
| * component, otherwise we shouldn't ligate them... */ |
| if (first_lig_id != this_lig_id || first_lig_comp != this_lig_comp) |
| { |
| /* ...unless, we are attached to a base ligature and that base |
| * ligature is ignorable. */ |
| if (ligbase == LIGBASE_NOT_CHECKED) |
| { |
| bool found = false; |
| const auto *out = buffer->out_info; |
| unsigned int j = buffer->out_len; |
| while (j && _hb_glyph_info_get_lig_id (&out[j - 1]) == first_lig_id) |
| { |
| if (_hb_glyph_info_get_lig_comp (&out[j - 1]) == 0) |
| { |
| j--; |
| found = true; |
| break; |
| } |
| j--; |
| } |
| |
| if (found && skippy_iter.may_skip (out[j]) == hb_ot_apply_context_t::matcher_t::SKIP_YES) |
| ligbase = LIGBASE_MAY_SKIP; |
| else |
| ligbase = LIGBASE_MAY_NOT_SKIP; |
| } |
| |
| if (ligbase == LIGBASE_MAY_NOT_SKIP) |
| return_trace (false); |
| } |
| } |
| else |
| { |
| /* If first component was NOT attached to a previous ligature component, |
| * all subsequent components should also NOT be attached to any ligature |
| * component, unless they are attached to the first component itself! */ |
| if (this_lig_id && this_lig_comp && (this_lig_id != first_lig_id)) |
| return_trace (false); |
| } |
| |
| total_component_count += _hb_glyph_info_get_lig_num_comps (&buffer->info[skippy_iter.idx]); |
| } |
| |
| *end_position = skippy_iter.idx + 1; |
| |
| if (p_total_component_count) |
| *p_total_component_count = total_component_count; |
| |
| return_trace (true); |
| } |
| static inline bool ligate_input (hb_ot_apply_context_t *c, |
| unsigned int count, /* Including the first glyph */ |
| const unsigned int match_positions[HB_MAX_CONTEXT_LENGTH], /* Including the first glyph */ |
| unsigned int match_end, |
| hb_codepoint_t lig_glyph, |
| unsigned int total_component_count) |
| { |
| TRACE_APPLY (nullptr); |
| |
| hb_buffer_t *buffer = c->buffer; |
| |
| buffer->merge_clusters (buffer->idx, match_end); |
| |
| /* - If a base and one or more marks ligate, consider that as a base, NOT |
| * ligature, such that all following marks can still attach to it. |
| * https://github.com/harfbuzz/harfbuzz/issues/1109 |
| * |
| * - If all components of the ligature were marks, we call this a mark ligature. |
| * If it *is* a mark ligature, we don't allocate a new ligature id, and leave |
| * the ligature to keep its old ligature id. This will allow it to attach to |
| * a base ligature in GPOS. Eg. if the sequence is: LAM,LAM,SHADDA,FATHA,HEH, |
| * and LAM,LAM,HEH for a ligature, they will leave SHADDA and FATHA with a |
| * ligature id and component value of 2. Then if SHADDA,FATHA form a ligature |
| * later, we don't want them to lose their ligature id/component, otherwise |
| * GPOS will fail to correctly position the mark ligature on top of the |
| * LAM,LAM,HEH ligature. See: |
| * https://bugzilla.gnome.org/show_bug.cgi?id=676343 |
| * |
| * - If a ligature is formed of components that some of which are also ligatures |
| * themselves, and those ligature components had marks attached to *their* |
| * components, we have to attach the marks to the new ligature component |
| * positions! Now *that*'s tricky! And these marks may be following the |
| * last component of the whole sequence, so we should loop forward looking |
| * for them and update them. |
| * |
| * Eg. the sequence is LAM,LAM,SHADDA,FATHA,HEH, and the font first forms a |
| * 'calt' ligature of LAM,HEH, leaving the SHADDA and FATHA with a ligature |
| * id and component == 1. Now, during 'liga', the LAM and the LAM-HEH ligature |
| * form a LAM-LAM-HEH ligature. We need to reassign the SHADDA and FATHA to |
| * the new ligature with a component value of 2. |
| * |
| * This in fact happened to a font... See: |
| * https://bugzilla.gnome.org/show_bug.cgi?id=437633 |
| */ |
| |
| bool is_base_ligature = _hb_glyph_info_is_base_glyph (&buffer->info[match_positions[0]]); |
| bool is_mark_ligature = _hb_glyph_info_is_mark (&buffer->info[match_positions[0]]); |
| for (unsigned int i = 1; i < count; i++) |
| if (!_hb_glyph_info_is_mark (&buffer->info[match_positions[i]])) |
| { |
| is_base_ligature = false; |
| is_mark_ligature = false; |
| break; |
| } |
| bool is_ligature = !is_base_ligature && !is_mark_ligature; |
| |
| unsigned int klass = is_ligature ? HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE : 0; |
| unsigned int lig_id = is_ligature ? _hb_allocate_lig_id (buffer) : 0; |
| unsigned int last_lig_id = _hb_glyph_info_get_lig_id (&buffer->cur()); |
| unsigned int last_num_components = _hb_glyph_info_get_lig_num_comps (&buffer->cur()); |
| unsigned int components_so_far = last_num_components; |
| |
| if (is_ligature) |
| { |
| _hb_glyph_info_set_lig_props_for_ligature (&buffer->cur(), lig_id, total_component_count); |
| if (_hb_glyph_info_get_general_category (&buffer->cur()) == HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK) |
| { |
| _hb_glyph_info_set_general_category (&buffer->cur(), HB_UNICODE_GENERAL_CATEGORY_OTHER_LETTER); |
| } |
| } |
| c->replace_glyph_with_ligature (lig_glyph, klass); |
| |
| for (unsigned int i = 1; i < count; i++) |
| { |
| while (buffer->idx < match_positions[i] && buffer->successful) |
| { |
| if (is_ligature) |
| { |
| unsigned int this_comp = _hb_glyph_info_get_lig_comp (&buffer->cur()); |
| if (this_comp == 0) |
| this_comp = last_num_components; |
| unsigned int new_lig_comp = components_so_far - last_num_components + |
| hb_min (this_comp, last_num_components); |
| _hb_glyph_info_set_lig_props_for_mark (&buffer->cur(), lig_id, new_lig_comp); |
| } |
| (void) buffer->next_glyph (); |
| } |
| |
| last_lig_id = _hb_glyph_info_get_lig_id (&buffer->cur()); |
| last_num_components = _hb_glyph_info_get_lig_num_comps (&buffer->cur()); |
| components_so_far += last_num_components; |
| |
| /* Skip the base glyph */ |
| buffer->idx++; |
| } |
| |
| if (!is_mark_ligature && last_lig_id) |
| { |
| /* Re-adjust components for any marks following. */ |
| for (unsigned i = buffer->idx; i < buffer->len; ++i) |
| { |
| if (last_lig_id != _hb_glyph_info_get_lig_id (&buffer->info[i])) break; |
| |
| unsigned this_comp = _hb_glyph_info_get_lig_comp (&buffer->info[i]); |
| if (!this_comp) break; |
| |
| unsigned new_lig_comp = components_so_far - last_num_components + |
| hb_min (this_comp, last_num_components); |
| _hb_glyph_info_set_lig_props_for_mark (&buffer->info[i], lig_id, new_lig_comp); |
| } |
| } |
| return_trace (true); |
| } |
| |
| template <typename HBUINT> |
| static inline bool match_backtrack (hb_ot_apply_context_t *c, |
| unsigned int count, |
| const HBUINT backtrack[], |
| match_func_t match_func, |
| const void *match_data, |
| unsigned int *match_start) |
| { |
| TRACE_APPLY (nullptr); |
| |
| hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_context; |
| skippy_iter.reset (c->buffer->backtrack_len (), count); |
| skippy_iter.set_match_func (match_func, match_data); |
| skippy_iter.set_glyph_data (backtrack); |
| |
| for (unsigned int i = 0; i < count; i++) |
| { |
| unsigned unsafe_from; |
| if (!skippy_iter.prev (&unsafe_from)) |
| { |
| *match_start = unsafe_from; |
| return_trace (false); |
| } |
| } |
| |
| *match_start = skippy_iter.idx; |
| return_trace (true); |
| } |
| |
| template <typename HBUINT> |
| static inline bool match_lookahead (hb_ot_apply_context_t *c, |
| unsigned int count, |
| const HBUINT lookahead[], |
| match_func_t match_func, |
| const void *match_data, |
| unsigned int start_index, |
| unsigned int *end_index) |
| { |
| TRACE_APPLY (nullptr); |
| |
| hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_context; |
| skippy_iter.reset (start_index - 1, count); |
| skippy_iter.set_match_func (match_func, match_data); |
| skippy_iter.set_glyph_data (lookahead); |
| |
| for (unsigned int i = 0; i < count; i++) |
| { |
| unsigned unsafe_to; |
| if (!skippy_iter.next (&unsafe_to)) |
| { |
| *end_index = unsafe_to; |
| return_trace (false); |
| } |
| } |
| |
| *end_index = skippy_iter.idx + 1; |
| return_trace (true); |
| } |
| |
| |
| |
| struct LookupRecord |
| { |
| bool serialize (hb_serialize_context_t *c, |
| const hb_map_t *lookup_map) const |
| { |
| TRACE_SERIALIZE (this); |
| auto *out = c->embed (*this); |
| if (unlikely (!out)) return_trace (false); |
| |
| return_trace (c->check_assign (out->lookupListIndex, lookup_map->get (lookupListIndex), HB_SERIALIZE_ERROR_INT_OVERFLOW)); |
| } |
| |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| return_trace (c->check_struct (this)); |
| } |
| |
| HBUINT16 sequenceIndex; /* Index into current glyph |
| * sequence--first glyph = 0 */ |
| HBUINT16 lookupListIndex; /* Lookup to apply to that |
| * position--zero--based */ |
| public: |
| DEFINE_SIZE_STATIC (4); |
| }; |
| |
| static unsigned serialize_lookuprecord_array (hb_serialize_context_t *c, |
| const hb_array_t<const LookupRecord> lookupRecords, |
| const hb_map_t *lookup_map) |
| { |
| unsigned count = 0; |
| for (const LookupRecord& r : lookupRecords) |
| { |
| if (!lookup_map->has (r.lookupListIndex)) |
| continue; |
| |
| if (!r.serialize (c, lookup_map)) |
| return 0; |
| |
| count++; |
| } |
| return count; |
| } |
| |
| enum ContextFormat { SimpleContext = 1, ClassBasedContext = 2, CoverageBasedContext = 3 }; |
| |
| template <typename HBUINT> |
| static void context_closure_recurse_lookups (hb_closure_context_t *c, |
| unsigned inputCount, const HBUINT input[], |
| unsigned lookupCount, |
| const LookupRecord lookupRecord[] /* Array of LookupRecords--in design order */, |
| unsigned value, |
| ContextFormat context_format, |
| const void *data, |
| intersected_glyphs_func_t intersected_glyphs_func) |
| { |
| hb_set_t *covered_seq_indicies = hb_set_create (); |
| for (unsigned int i = 0; i < lookupCount; i++) |
| { |
| unsigned seqIndex = lookupRecord[i].sequenceIndex; |
| if (seqIndex >= inputCount) continue; |
| |
| bool has_pos_glyphs = false; |
| hb_set_t pos_glyphs; |
| |
| if (!hb_set_has (covered_seq_indicies, seqIndex)) |
| { |
| has_pos_glyphs = true; |
| if (seqIndex == 0) |
| { |
| switch (context_format) { |
| case ContextFormat::SimpleContext: |
| pos_glyphs.add (value); |
| break; |
| case ContextFormat::ClassBasedContext: |
| intersected_glyphs_func (&c->parent_active_glyphs (), data, value, &pos_glyphs); |
| break; |
| case ContextFormat::CoverageBasedContext: |
| pos_glyphs.set (c->parent_active_glyphs ()); |
| break; |
| } |
| } |
| else |
| { |
| const void *input_data = input; |
| unsigned input_value = seqIndex - 1; |
| if (context_format != ContextFormat::SimpleContext) |
| { |
| input_data = data; |
| input_value = input[seqIndex - 1]; |
| } |
| |
| intersected_glyphs_func (c->glyphs, input_data, input_value, &pos_glyphs); |
| } |
| } |
| |
| covered_seq_indicies->add (seqIndex); |
| if (has_pos_glyphs) { |
| c->push_cur_active_glyphs () = std::move (pos_glyphs); |
| } else { |
| c->push_cur_active_glyphs ().set (*c->glyphs); |
| } |
| |
| unsigned endIndex = inputCount; |
| if (context_format == ContextFormat::CoverageBasedContext) |
| endIndex += 1; |
| |
| c->recurse (lookupRecord[i].lookupListIndex, covered_seq_indicies, seqIndex, endIndex); |
| |
| c->pop_cur_done_glyphs (); |
| } |
| |
| hb_set_destroy (covered_seq_indicies); |
| } |
| |
| template <typename context_t> |
| static inline void recurse_lookups (context_t *c, |
| unsigned int lookupCount, |
| const LookupRecord lookupRecord[] /* Array of LookupRecords--in design order */) |
| { |
| for (unsigned int i = 0; i < lookupCount; i++) |
| c->recurse (lookupRecord[i].lookupListIndex); |
| } |
| |
| static inline void apply_lookup (hb_ot_apply_context_t *c, |
| unsigned int count, /* Including the first glyph */ |
| unsigned int match_positions[HB_MAX_CONTEXT_LENGTH], /* Including the first glyph */ |
| unsigned int lookupCount, |
| const LookupRecord lookupRecord[], /* Array of LookupRecords--in design order */ |
| unsigned int match_end) |
| { |
| hb_buffer_t *buffer = c->buffer; |
| int end; |
| |
| /* All positions are distance from beginning of *output* buffer. |
| * Adjust. */ |
| { |
| unsigned int bl = buffer->backtrack_len (); |
| end = bl + match_end - buffer->idx; |
| |
| int delta = bl - buffer->idx; |
| /* Convert positions to new indexing. */ |
| for (unsigned int j = 0; j < count; j++) |
| match_positions[j] += delta; |
| } |
| |
| for (unsigned int i = 0; i < lookupCount && buffer->successful; i++) |
| { |
| unsigned int idx = lookupRecord[i].sequenceIndex; |
| if (idx >= count) |
| continue; |
| |
| unsigned int orig_len = buffer->backtrack_len () + buffer->lookahead_len (); |
| |
| /* This can happen if earlier recursed lookups deleted many entries. */ |
| if (unlikely (match_positions[idx] >= orig_len)) |
| continue; |
| |
| if (unlikely (!buffer->move_to (match_positions[idx]))) |
| break; |
| |
| if (unlikely (buffer->max_ops <= 0)) |
| break; |
| |
| if (!c->recurse (lookupRecord[i].lookupListIndex)) |
| continue; |
| |
| unsigned int new_len = buffer->backtrack_len () + buffer->lookahead_len (); |
| int delta = new_len - orig_len; |
| |
| if (!delta) |
| continue; |
| |
| /* Recursed lookup changed buffer len. Adjust. |
| * |
| * TODO: |
| * |
| * Right now, if buffer length increased by n, we assume n new glyphs |
| * were added right after the current position, and if buffer length |
| * was decreased by n, we assume n match positions after the current |
| * one where removed. The former (buffer length increased) case is |
| * fine, but the decrease case can be improved in at least two ways, |
| * both of which are significant: |
| * |
| * - If recursed-to lookup is MultipleSubst and buffer length |
| * decreased, then it's current match position that was deleted, |
| * NOT the one after it. |
| * |
| * - If buffer length was decreased by n, it does not necessarily |
| * mean that n match positions where removed, as there recursed-to |
| * lookup might had a different LookupFlag. Here's a constructed |
| * case of that: |
| * https://github.com/harfbuzz/harfbuzz/discussions/3538 |
| * |
| * It should be possible to construct tests for both of these cases. |
| */ |
| |
| end += delta; |
| if (end < int (match_positions[idx])) |
| { |
| /* End might end up being smaller than match_positions[idx] if the recursed |
| * lookup ended up removing many items. |
| * Just never rewind end beyond start of current position, since that is |
| * not possible in the recursed lookup. Also adjust delta as such. |
| * |
| * https://bugs.chromium.org/p/chromium/issues/detail?id=659496 |
| * https://github.com/harfbuzz/harfbuzz/issues/1611 |
| */ |
| delta += match_positions[idx] - end; |
| end = match_positions[idx]; |
| } |
| |
| unsigned int next = idx + 1; /* next now is the position after the recursed lookup. */ |
| |
| if (delta > 0) |
| { |
| if (unlikely (delta + count > HB_MAX_CONTEXT_LENGTH)) |
| break; |
| } |
| else |
| { |
| /* NOTE: delta is non-positive. */ |
| delta = hb_max (delta, (int) next - (int) count); |
| next -= delta; |
| } |
| |
| /* Shift! */ |
| memmove (match_positions + next + delta, match_positions + next, |
| (count - next) * sizeof (match_positions[0])); |
| next += delta; |
| count += delta; |
| |
| /* Fill in new entries. */ |
| for (unsigned int j = idx + 1; j < next; j++) |
| match_positions[j] = match_positions[j - 1] + 1; |
| |
| /* And fixup the rest. */ |
| for (; next < count; next++) |
| match_positions[next] += delta; |
| } |
| |
| (void) buffer->move_to (end); |
| } |
| |
| |
| |
| /* Contextual lookups */ |
| |
| struct ContextClosureLookupContext |
| { |
| ContextClosureFuncs funcs; |
| ContextFormat context_format; |
| const void *intersects_data; |
| }; |
| |
| struct ContextCollectGlyphsLookupContext |
| { |
| ContextCollectGlyphsFuncs funcs; |
| const void *collect_data; |
| }; |
| |
| struct ContextApplyLookupContext |
| { |
| ContextApplyFuncs funcs; |
| const void *match_data; |
| }; |
| |
| template <typename HBUINT> |
| static inline bool context_intersects (const hb_set_t *glyphs, |
| unsigned int inputCount, /* Including the first glyph (not matched) */ |
| const HBUINT input[], /* Array of input values--start with second glyph */ |
| ContextClosureLookupContext &lookup_context) |
| { |
| return array_is_subset_of (glyphs, |
| inputCount ? inputCount - 1 : 0, input, |
| lookup_context.funcs.intersects, lookup_context.intersects_data); |
| } |
| |
| template <typename HBUINT> |
| static inline void context_closure_lookup (hb_closure_context_t *c, |
| unsigned int inputCount, /* Including the first glyph (not matched) */ |
| const HBUINT input[], /* Array of input values--start with second glyph */ |
| unsigned int lookupCount, |
| const LookupRecord lookupRecord[], |
| unsigned value, /* Index of first glyph in Coverage or Class value in ClassDef table */ |
| ContextClosureLookupContext &lookup_context) |
| { |
| if (context_intersects (c->glyphs, |
| inputCount, input, |
| lookup_context)) |
| context_closure_recurse_lookups (c, |
| inputCount, input, |
| lookupCount, lookupRecord, |
| value, |
| lookup_context.context_format, |
| lookup_context.intersects_data, |
| lookup_context.funcs.intersected_glyphs); |
| } |
| |
| template <typename HBUINT> |
| static inline void context_collect_glyphs_lookup (hb_collect_glyphs_context_t *c, |
| unsigned int inputCount, /* Including the first glyph (not matched) */ |
| const HBUINT input[], /* Array of input values--start with second glyph */ |
| unsigned int lookupCount, |
| const LookupRecord lookupRecord[], |
| ContextCollectGlyphsLookupContext &lookup_context) |
| { |
| collect_array (c, c->input, |
| inputCount ? inputCount - 1 : 0, input, |
| lookup_context.funcs.collect, lookup_context.collect_data); |
| recurse_lookups (c, |
| lookupCount, lookupRecord); |
| } |
| |
| template <typename HBUINT> |
| static inline bool context_would_apply_lookup (hb_would_apply_context_t *c, |
| unsigned int inputCount, /* Including the first glyph (not matched) */ |
| const HBUINT input[], /* Array of input values--start with second glyph */ |
| unsigned int lookupCount HB_UNUSED, |
| const LookupRecord lookupRecord[] HB_UNUSED, |
| ContextApplyLookupContext &lookup_context) |
| { |
| return would_match_input (c, |
| inputCount, input, |
| lookup_context.funcs.match, lookup_context.match_data); |
| } |
| |
| template <typename HBUINT> |
| static inline bool context_apply_lookup (hb_ot_apply_context_t *c, |
| unsigned int inputCount, /* Including the first glyph (not matched) */ |
| const HBUINT input[], /* Array of input values--start with second glyph */ |
| unsigned int lookupCount, |
| const LookupRecord lookupRecord[], |
| ContextApplyLookupContext &lookup_context) |
| { |
| unsigned match_end = 0; |
| unsigned match_positions[HB_MAX_CONTEXT_LENGTH]; |
| if (match_input (c, |
| inputCount, input, |
| lookup_context.funcs.match, lookup_context.match_data, |
| &match_end, match_positions)) |
| { |
| c->buffer->unsafe_to_break (c->buffer->idx, match_end); |
| apply_lookup (c, |
| inputCount, match_positions, |
| lookupCount, lookupRecord, |
| match_end); |
| return true; |
| } |
| else |
| { |
| c->buffer->unsafe_to_concat (c->buffer->idx, match_end); |
| return false; |
| } |
| } |
| |
| template <typename Types> |
| struct Rule |
| { |
| bool intersects (const hb_set_t *glyphs, ContextClosureLookupContext &lookup_context) const |
| { |
| return context_intersects (glyphs, |
| inputCount, inputZ.arrayZ, |
| lookup_context); |
| } |
| |
| void closure (hb_closure_context_t *c, unsigned value, ContextClosureLookupContext &lookup_context) const |
| { |
| if (unlikely (c->lookup_limit_exceeded ())) return; |
| |
| const auto &lookupRecord = StructAfter<UnsizedArrayOf<LookupRecord>> |
| (inputZ.as_array ((inputCount ? inputCount - 1 : 0))); |
| context_closure_lookup (c, |
| inputCount, inputZ.arrayZ, |
| lookupCount, lookupRecord.arrayZ, |
| value, lookup_context); |
| } |
| |
| void closure_lookups (hb_closure_lookups_context_t *c, |
| ContextClosureLookupContext &lookup_context) const |
| { |
| if (unlikely (c->lookup_limit_exceeded ())) return; |
| if (!intersects (c->glyphs, lookup_context)) return; |
| |
| const auto &lookupRecord = StructAfter<UnsizedArrayOf<LookupRecord>> |
| (inputZ.as_array (inputCount ? inputCount - 1 : 0)); |
| recurse_lookups (c, lookupCount, lookupRecord.arrayZ); |
| } |
| |
| void collect_glyphs (hb_collect_glyphs_context_t *c, |
| ContextCollectGlyphsLookupContext &lookup_context) const |
| { |
| const auto &lookupRecord = StructAfter<UnsizedArrayOf<LookupRecord>> |
| (inputZ.as_array (inputCount ? inputCount - 1 : 0)); |
| context_collect_glyphs_lookup (c, |
| inputCount, inputZ.arrayZ, |
| lookupCount, lookupRecord.arrayZ, |
| lookup_context); |
| } |
| |
| bool would_apply (hb_would_apply_context_t *c, |
| ContextApplyLookupContext &lookup_context) const |
| { |
| const auto &lookupRecord = StructAfter<UnsizedArrayOf<LookupRecord>> |
| (inputZ.as_array (inputCount ? inputCount - 1 : 0)); |
| return context_would_apply_lookup (c, |
| inputCount, inputZ.arrayZ, |
| lookupCount, lookupRecord.arrayZ, |
| lookup_context); |
| } |
| |
| bool apply (hb_ot_apply_context_t *c, |
| ContextApplyLookupContext &lookup_context) const |
| { |
| TRACE_APPLY (this); |
| const auto &lookupRecord = StructAfter<UnsizedArrayOf<LookupRecord>> |
| (inputZ.as_array (inputCount ? inputCount - 1 : 0)); |
| return_trace (context_apply_lookup (c, inputCount, inputZ.arrayZ, lookupCount, lookupRecord.arrayZ, lookup_context)); |
| } |
| |
| bool serialize (hb_serialize_context_t *c, |
| const hb_map_t *input_mapping, /* old->new glyphid or class mapping */ |
| const hb_map_t *lookup_map) const |
| { |
| TRACE_SERIALIZE (this); |
| auto *out = c->start_embed (this); |
| if (unlikely (!c->extend_min (out))) return_trace (false); |
| |
| out->inputCount = inputCount; |
| const auto input = inputZ.as_array (inputCount - 1); |
| for (const auto org : input) |
| { |
| HBUINT16 d; |
| d = input_mapping->get (org); |
| c->copy (d); |
| } |
| |
| const auto &lookupRecord = StructAfter<UnsizedArrayOf<LookupRecord>> |
| (inputZ.as_array ((inputCount ? inputCount - 1 : 0))); |
| |
| unsigned count = serialize_lookuprecord_array (c, lookupRecord.as_array (lookupCount), lookup_map); |
| return_trace (c->check_assign (out->lookupCount, count, HB_SERIALIZE_ERROR_INT_OVERFLOW)); |
| } |
| |
| bool subset (hb_subset_context_t *c, |
| const hb_map_t *lookup_map, |
| const hb_map_t *klass_map = nullptr) const |
| { |
| TRACE_SUBSET (this); |
| if (unlikely (!inputCount)) return_trace (false); |
| const auto input = inputZ.as_array (inputCount - 1); |
| |
| const hb_map_t *mapping = klass_map == nullptr ? c->plan->glyph_map : klass_map; |
| if (!hb_all (input, mapping)) return_trace (false); |
| return_trace (serialize (c->serializer, mapping, lookup_map)); |
| } |
| |
| public: |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| return_trace (inputCount.sanitize (c) && |
| lookupCount.sanitize (c) && |
| c->check_range (inputZ.arrayZ, |
| inputZ.item_size * (inputCount ? inputCount - 1 : 0) + |
| LookupRecord::static_size * lookupCount)); |
| } |
| |
| protected: |
| HBUINT16 inputCount; /* Total number of glyphs in input |
| * glyph sequence--includes the first |
| * glyph */ |
| HBUINT16 lookupCount; /* Number of LookupRecords */ |
| UnsizedArrayOf<typename Types::HBUINT> |
| inputZ; /* Array of match inputs--start with |
| * second glyph */ |
| /*UnsizedArrayOf<LookupRecord> |
| lookupRecordX;*/ /* Array of LookupRecords--in |
| * design order */ |
| public: |
| DEFINE_SIZE_ARRAY (4, inputZ); |
| }; |
| |
| template <typename Types> |
| struct RuleSet |
| { |
| using Rule = OT::Rule<Types>; |
| |
| bool intersects (const hb_set_t *glyphs, |
| ContextClosureLookupContext &lookup_context) const |
| { |
| return |
| + hb_iter (rule) |
| | hb_map (hb_add (this)) |
| | hb_map ([&] (const Rule &_) { return _.intersects (glyphs, lookup_context); }) |
| | hb_any |
| ; |
| } |
| |
| void closure (hb_closure_context_t *c, unsigned value, |
| ContextClosureLookupContext &lookup_context) const |
| { |
| if (unlikely (c->lookup_limit_exceeded ())) return; |
| |
| return |
| + hb_iter (rule) |
| | hb_map (hb_add (this)) |
| | hb_apply ([&] (const Rule &_) { _.closure (c, value, lookup_context); }) |
| ; |
| } |
| |
| void closure_lookups (hb_closure_lookups_context_t *c, |
| ContextClosureLookupContext &lookup_context) const |
| { |
| if (unlikely (c->lookup_limit_exceeded ())) return; |
| + hb_iter (rule) |
| | hb_map (hb_add (this)) |
| | hb_apply ([&] (const Rule &_) { _.closure_lookups (c, lookup_context); }) |
| ; |
| } |
| |
| void collect_glyphs (hb_collect_glyphs_context_t *c, |
| ContextCollectGlyphsLookupContext &lookup_context) const |
| { |
| return |
| + hb_iter (rule) |
| | hb_map (hb_add (this)) |
| | hb_apply ([&] (const Rule &_) { _.collect_glyphs (c, lookup_context); }) |
| ; |
| } |
| |
| bool would_apply (hb_would_apply_context_t *c, |
| ContextApplyLookupContext &lookup_context) const |
| { |
| return |
| + hb_iter (rule) |
| | hb_map (hb_add (this)) |
| | hb_map ([&] (const Rule &_) { return _.would_apply (c, lookup_context); }) |
| | hb_any |
| ; |
| } |
| |
| bool apply (hb_ot_apply_context_t *c, |
| ContextApplyLookupContext &lookup_context) const |
| { |
| TRACE_APPLY (this); |
| return_trace ( |
| + hb_iter (rule) |
| | hb_map (hb_add (this)) |
| | hb_map ([&] (const Rule &_) { return _.apply (c, lookup_context); }) |
| | hb_any |
| ) |
| ; |
| } |
| |
| bool subset (hb_subset_context_t *c, |
| const hb_map_t *lookup_map, |
| const hb_map_t *klass_map = nullptr) const |
| { |
| TRACE_SUBSET (this); |
| |
| auto snap = c->serializer->snapshot (); |
| auto *out = c->serializer->start_embed (*this); |
| if (unlikely (!c->serializer->extend_min (out))) return_trace (false); |
| |
| for (const Offset16To<Rule>& _ : rule) |
| { |
| if (!_) continue; |
| auto o_snap = c->serializer->snapshot (); |
| auto *o = out->rule.serialize_append (c->serializer); |
| if (unlikely (!o)) continue; |
| |
| if (!o->serialize_subset (c, _, this, lookup_map, klass_map)) |
| { |
| out->rule.pop (); |
| c->serializer->revert (o_snap); |
| } |
| } |
| |
| bool ret = bool (out->rule); |
| if (!ret) c->serializer->revert (snap); |
| |
| return_trace (ret); |
| } |
| |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| return_trace (rule.sanitize (c, this)); |
| } |
| |
| protected: |
| Array16OfOffset16To<Rule> |
| rule; /* Array of Rule tables |
| * ordered by preference */ |
| public: |
| DEFINE_SIZE_ARRAY (2, rule); |
| }; |
| |
| |
| template <typename Types> |
| struct ContextFormat1_4 |
| { |
| using RuleSet = OT::RuleSet<Types>; |
| |
| bool intersects (const hb_set_t *glyphs) const |
| { |
| struct ContextClosureLookupContext lookup_context = { |
| {intersects_glyph, intersected_glyph}, |
| ContextFormat::SimpleContext, |
| nullptr |
| }; |
| |
| return |
| + hb_zip (this+coverage, ruleSet) |
| | hb_filter (*glyphs, hb_first) |
| | hb_map (hb_second) |
| | hb_map (hb_add (this)) |
| | hb_map ([&] (const RuleSet &_) { return _.intersects (glyphs, lookup_context); }) |
| | hb_any |
| ; |
| } |
| |
| bool may_have_non_1to1 () const |
| { return true; } |
| |
| void closure (hb_closure_context_t *c) const |
| { |
| hb_set_t* cur_active_glyphs = &c->push_cur_active_glyphs (); |
| get_coverage ().intersected_coverage_glyphs (&c->previous_parent_active_glyphs (), |
| cur_active_glyphs); |
| |
| struct ContextClosureLookupContext lookup_context = { |
| {intersects_glyph, intersected_glyph}, |
| ContextFormat::SimpleContext, |
| nullptr |
| }; |
| |
| + hb_zip (this+coverage, hb_range ((unsigned) ruleSet.len)) |
| | hb_filter ([&] (hb_codepoint_t _) { |
| return c->previous_parent_active_glyphs ().has (_); |
| }, hb_first) |
| | hb_map ([&](const hb_pair_t<hb_codepoint_t, unsigned> _) { return hb_pair_t<unsigned, const RuleSet&> (_.first, this+ruleSet[_.second]); }) |
| | hb_apply ([&] (const hb_pair_t<unsigned, const RuleSet&>& _) { _.second.closure (c, _.first, lookup_context); }) |
| ; |
| |
| c->pop_cur_done_glyphs (); |
| } |
| |
| void closure_lookups (hb_closure_lookups_context_t *c) const |
| { |
| struct ContextClosureLookupContext lookup_context = { |
| {intersects_glyph, intersected_glyph}, |
| ContextFormat::SimpleContext, |
| nullptr |
| }; |
| |
| + hb_zip (this+coverage, ruleSet) |
| | hb_filter (*c->glyphs, hb_first) |
| | hb_map (hb_second) |
| | hb_map (hb_add (this)) |
| | hb_apply ([&] (const RuleSet &_) { _.closure_lookups (c, lookup_context); }) |
| ; |
| } |
| |
| void collect_variation_indices (hb_collect_variation_indices_context_t *c) const {} |
| |
| void collect_glyphs (hb_collect_glyphs_context_t *c) const |
| { |
| (this+coverage).collect_coverage (c->input); |
| |
| struct ContextCollectGlyphsLookupContext lookup_context = { |
| {collect_glyph}, |
| nullptr |
| }; |
| |
| + hb_iter (ruleSet) |
| | hb_map (hb_add (this)) |
| | hb_apply ([&] (const RuleSet &_) { _.collect_glyphs (c, lookup_context); }) |
| ; |
| } |
| |
| bool would_apply (hb_would_apply_context_t *c) const |
| { |
| const RuleSet &rule_set = this+ruleSet[(this+coverage).get_coverage (c->glyphs[0])]; |
| struct ContextApplyLookupContext lookup_context = { |
| {match_glyph}, |
| nullptr |
| }; |
| return rule_set.would_apply (c, lookup_context); |
| } |
| |
| const Coverage &get_coverage () const { return this+coverage; } |
| |
| bool apply (hb_ot_apply_context_t *c) const |
| { |
| TRACE_APPLY (this); |
| unsigned int index = (this+coverage).get_coverage (c->buffer->cur().codepoint); |
| if (likely (index == NOT_COVERED)) |
| return_trace (false); |
| |
| const RuleSet &rule_set = this+ruleSet[index]; |
| struct ContextApplyLookupContext lookup_context = { |
| {match_glyph}, |
| nullptr |
| }; |
| return_trace (rule_set.apply (c, lookup_context)); |
| } |
| |
| bool subset (hb_subset_context_t *c) const |
| { |
| TRACE_SUBSET (this); |
| const hb_set_t &glyphset = *c->plan->glyphset_gsub (); |
| const hb_map_t &glyph_map = *c->plan->glyph_map; |
| |
| auto *out = c->serializer->start_embed (*this); |
| if (unlikely (!c->serializer->extend_min (out))) return_trace (false); |
| out->format = format; |
| |
| const hb_map_t *lookup_map = c->table_tag == HB_OT_TAG_GSUB ? c->plan->gsub_lookups : c->plan->gpos_lookups; |
| hb_sorted_vector_t<hb_codepoint_t> new_coverage; |
| + hb_zip (this+coverage, ruleSet) |
| | hb_filter (glyphset, hb_first) |
| | hb_filter (subset_offset_array (c, out->ruleSet, this, lookup_map), hb_second) |
| | hb_map (hb_first) |
| | hb_map (glyph_map) |
| | hb_sink (new_coverage) |
| ; |
| |
| out->coverage.serialize_serialize (c->serializer, new_coverage.iter ()); |
| return_trace (bool (new_coverage)); |
| } |
| |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| return_trace (coverage.sanitize (c, this) && ruleSet.sanitize (c, this)); |
| } |
| |
| protected: |
| HBUINT16 format; /* Format identifier--format = 1 */ |
| typename Types::template OffsetTo<Coverage> |
| coverage; /* Offset to Coverage table--from |
| * beginning of table */ |
| Array16Of<typename Types::template OffsetTo<RuleSet>> |
| ruleSet; /* Array of RuleSet tables |
| * ordered by Coverage Index */ |
| public: |
| DEFINE_SIZE_ARRAY (2 + 2 * Types::size, ruleSet); |
| }; |
| |
| |
| template <typename Types> |
| struct ContextFormat2_5 |
| { |
| using RuleSet = OT::RuleSet<SmallTypes>; |
| |
| bool intersects (const hb_set_t *glyphs) const |
| { |
| if (!(this+coverage).intersects (glyphs)) |
| return false; |
| |
| const ClassDef &class_def = this+classDef; |
| |
| struct ContextClosureLookupContext lookup_context = { |
| {intersects_class, intersected_class_glyphs}, |
| ContextFormat::ClassBasedContext, |
| &class_def |
| }; |
| |
| hb_set_t retained_coverage_glyphs; |
| (this+coverage).intersected_coverage_glyphs (glyphs, &retained_coverage_glyphs); |
| |
| hb_set_t coverage_glyph_classes; |
| class_def.intersected_classes (&retained_coverage_glyphs, &coverage_glyph_classes); |
| |
| |
| return |
| + hb_iter (ruleSet) |
| | hb_map (hb_add (this)) |
| | hb_enumerate |
| | hb_map ([&] (const hb_pair_t<unsigned, const RuleSet &> p) |
| { return class_def.intersects_class (glyphs, p.first) && |
| coverage_glyph_classes.has (p.first) && |
| p.second.intersects (glyphs, lookup_context); }) |
| | hb_any |
| ; |
| } |
| |
| bool may_have_non_1to1 () const |
| { return true; } |
| |
| void closure (hb_closure_context_t *c) const |
| { |
| if (!(this+coverage).intersects (c->glyphs)) |
| return; |
| |
| hb_set_t* cur_active_glyphs = &c->push_cur_active_glyphs (); |
| get_coverage ().intersected_coverage_glyphs (&c->previous_parent_active_glyphs (), |
| cur_active_glyphs); |
| |
| const ClassDef &class_def = this+classDef; |
| |
| struct ContextClosureLookupContext lookup_context = { |
| {intersects_class, intersected_class_glyphs}, |
| ContextFormat::ClassBasedContext, |
| &class_def |
| }; |
| |
| + hb_enumerate (ruleSet) |
| | hb_filter ([&] (unsigned _) |
| { return class_def.intersects_class (&c->parent_active_glyphs (), _); }, |
| hb_first) |
| | hb_apply ([&] (const hb_pair_t<unsigned, const typename Types::template OffsetTo<RuleSet>&> _) |
| { |
| const RuleSet& rule_set = this+_.second; |
| rule_set.closure (c, _.first, lookup_context); |
| }) |
| ; |
| |
| c->pop_cur_done_glyphs (); |
| } |
| |
| void closure_lookups (hb_closure_lookups_context_t *c) const |
| { |
| if (!(this+coverage).intersects (c->glyphs)) |
| return; |
| |
| const ClassDef &class_def = this+classDef; |
| |
| struct ContextClosureLookupContext lookup_context = { |
| {intersects_class, intersected_class_glyphs}, |
| ContextFormat::ClassBasedContext, |
| &class_def |
| }; |
| |
| + hb_iter (ruleSet) |
| | hb_map (hb_add (this)) |
| | hb_enumerate |
| | hb_filter ([&] (const hb_pair_t<unsigned, const RuleSet &> p) |
| { return class_def.intersects_class (c->glyphs, p.first); }) |
| | hb_map (hb_second) |
| | hb_apply ([&] (const RuleSet & _) |
| { _.closure_lookups (c, lookup_context); }); |
| } |
| |
| void collect_variation_indices (hb_collect_variation_indices_context_t *c) const {} |
| |
| void collect_glyphs (hb_collect_glyphs_context_t *c) const |
| { |
| (this+coverage).collect_coverage (c->input); |
| |
| const ClassDef &class_def = this+classDef; |
| struct ContextCollectGlyphsLookupContext lookup_context = { |
| {collect_class}, |
| &class_def |
| }; |
| |
| + hb_iter (ruleSet) |
| | hb_map (hb_add (this)) |
| | hb_apply ([&] (const RuleSet &_) { _.collect_glyphs (c, lookup_context); }) |
| ; |
| } |
| |
| bool would_apply (hb_would_apply_context_t *c) const |
| { |
| const ClassDef &class_def = this+classDef; |
| unsigned int index = class_def.get_class (c->glyphs[0]); |
| const RuleSet &rule_set = this+ruleSet[index]; |
| struct ContextApplyLookupContext lookup_context = { |
| {match_class}, |
| &class_def |
| }; |
| return rule_set.would_apply (c, lookup_context); |
| } |
| |
| const Coverage &get_coverage () const { return this+coverage; } |
| |
| unsigned cache_cost () const |
| { |
| unsigned c = (this+classDef).cost () * ruleSet.len; |
| return c >= 4 ? c : 0; |
| } |
| bool cache_func (hb_ot_apply_context_t *c, bool enter) const |
| { |
| if (enter) |
| { |
| if (!HB_BUFFER_TRY_ALLOCATE_VAR (c->buffer, syllable)) |
| return false; |
| auto &info = c->buffer->info; |
| unsigned count = c->buffer->len; |
| for (unsigned i = 0; i < count; i++) |
| info[i].syllable() = 255; |
| c->new_syllables = 255; |
| return true; |
| } |
| else |
| { |
| c->new_syllables = (unsigned) -1; |
| HB_BUFFER_DEALLOCATE_VAR (c->buffer, syllable); |
| return true; |
| } |
| } |
| |
| bool apply (hb_ot_apply_context_t *c, bool cached = false) const |
| { |
| TRACE_APPLY (this); |
| unsigned int index = (this+coverage).get_coverage (c->buffer->cur().codepoint); |
| if (likely (index == NOT_COVERED)) return_trace (false); |
| |
| const ClassDef &class_def = this+classDef; |
| |
| struct ContextApplyLookupContext lookup_context = { |
| {cached ? match_class_cached : match_class}, |
| &class_def |
| }; |
| |
| if (cached && c->buffer->cur().syllable() < 255) |
| index = c->buffer->cur().syllable (); |
| else |
| { |
| index = class_def.get_class (c->buffer->cur().codepoint); |
| if (cached && index < 255) |
| c->buffer->cur().syllable() = index; |
| } |
| const RuleSet &rule_set = this+ruleSet[index]; |
| return_trace (rule_set.apply (c, lookup_context)); |
| } |
| |
| bool subset (hb_subset_context_t *c) const |
| { |
| TRACE_SUBSET (this); |
| auto *out = c->serializer->start_embed (*this); |
| if (unlikely (!c->serializer->extend_min (out))) return_trace (false); |
| out->format = format; |
| if (unlikely (!out->coverage.serialize_subset (c, coverage, this))) |
| return_trace (false); |
| |
| hb_map_t klass_map; |
| out->classDef.serialize_subset (c, classDef, this, &klass_map); |
| |
| const hb_set_t* glyphset = c->plan->glyphset_gsub (); |
| hb_set_t retained_coverage_glyphs; |
| (this+coverage).intersected_coverage_glyphs (glyphset, &retained_coverage_glyphs); |
| |
| hb_set_t coverage_glyph_classes; |
| (this+classDef).intersected_classes (&retained_coverage_glyphs, &coverage_glyph_classes); |
| |
| const hb_map_t *lookup_map = c->table_tag == HB_OT_TAG_GSUB ? c->plan->gsub_lookups : c->plan->gpos_lookups; |
| bool ret = true; |
| int non_zero_index = -1, index = 0; |
| for (const auto& _ : + hb_enumerate (ruleSet) |
| | hb_filter (klass_map, hb_first)) |
| { |
| auto *o = out->ruleSet.serialize_append (c->serializer); |
| if (unlikely (!o)) |
| { |
| ret = false; |
| break; |
| } |
| |
| if (coverage_glyph_classes.has (_.first) && |
| o->serialize_subset (c, _.second, this, lookup_map, &klass_map)) |
| non_zero_index = index; |
| |
| index++; |
| } |
| |
| if (!ret || non_zero_index == -1) return_trace (false); |
| |
| //prune empty trailing ruleSets |
| --index; |
| while (index > non_zero_index) |
| { |
| out->ruleSet.pop (); |
| index--; |
| } |
| |
| return_trace (bool (out->ruleSet)); |
| } |
| |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| return_trace (coverage.sanitize (c, this) && classDef.sanitize (c, this) && ruleSet.sanitize (c, this)); |
| } |
| |
| protected: |
| HBUINT16 format; /* Format identifier--format = 2 */ |
| typename Types::template OffsetTo<Coverage> |
| coverage; /* Offset to Coverage table--from |
| * beginning of table */ |
| typename Types::template OffsetTo<ClassDef> |
| classDef; /* Offset to glyph ClassDef table--from |
| * beginning of table */ |
| Array16Of<typename Types::template OffsetTo<RuleSet>> |
| ruleSet; /* Array of RuleSet tables |
| * ordered by class */ |
| public: |
| DEFINE_SIZE_ARRAY (4 + 2 * Types::size, ruleSet); |
| }; |
| |
| |
| struct ContextFormat3 |
| { |
| using RuleSet = OT::RuleSet<SmallTypes>; |
| |
| bool intersects (const hb_set_t *glyphs) const |
| { |
| if (!(this+coverageZ[0]).intersects (glyphs)) |
| return false; |
| |
| struct ContextClosureLookupContext lookup_context = { |
| {intersects_coverage, intersected_coverage_glyphs}, |
| ContextFormat::CoverageBasedContext, |
| this |
| }; |
| return context_intersects (glyphs, |
| glyphCount, (const HBUINT16 *) (coverageZ.arrayZ + 1), |
| lookup_context); |
| } |
| |
| bool may_have_non_1to1 () const |
| { return true; } |
| |
| void closure (hb_closure_context_t *c) const |
| { |
| if (!(this+coverageZ[0]).intersects (c->glyphs)) |
| return; |
| |
| hb_set_t* cur_active_glyphs = &c->push_cur_active_glyphs (); |
| get_coverage ().intersected_coverage_glyphs (&c->previous_parent_active_glyphs (), |
| cur_active_glyphs); |
| |
| |
| const LookupRecord *lookupRecord = &StructAfter<LookupRecord> (coverageZ.as_array (glyphCount)); |
| struct ContextClosureLookupContext lookup_context = { |
| {intersects_coverage, intersected_coverage_glyphs}, |
| ContextFormat::CoverageBasedContext, |
| this |
| }; |
| context_closure_lookup (c, |
| glyphCount, (const HBUINT16 *) (coverageZ.arrayZ + 1), |
| lookupCount, lookupRecord, |
| 0, lookup_context); |
| |
| c->pop_cur_done_glyphs (); |
| } |
| |
| void closure_lookups (hb_closure_lookups_context_t *c) const |
| { |
| if (!intersects (c->glyphs)) |
| return; |
| const LookupRecord *lookupRecord = &StructAfter<LookupRecord> (coverageZ.as_array (glyphCount)); |
| recurse_lookups (c, lookupCount, lookupRecord); |
| } |
| |
| void collect_variation_indices (hb_collect_variation_indices_context_t *c) const {} |
| |
| void collect_glyphs (hb_collect_glyphs_context_t *c) const |
| { |
| (this+coverageZ[0]).collect_coverage (c->input); |
| |
| const LookupRecord *lookupRecord = &StructAfter<LookupRecord> (coverageZ.as_array (glyphCount)); |
| struct ContextCollectGlyphsLookupContext lookup_context = { |
| {collect_coverage}, |
| this |
| }; |
| |
| context_collect_glyphs_lookup (c, |
| glyphCount, (const HBUINT16 *) (coverageZ.arrayZ + 1), |
| lookupCount, lookupRecord, |
| lookup_context); |
| } |
| |
| bool would_apply (hb_would_apply_context_t *c) const |
| { |
| const LookupRecord *lookupRecord = &StructAfter<LookupRecord> (coverageZ.as_array (glyphCount)); |
| struct ContextApplyLookupContext lookup_context = { |
| {match_coverage}, |
| this |
| }; |
| return context_would_apply_lookup (c, |
| glyphCount, (const HBUINT16 *) (coverageZ.arrayZ + 1), |
| lookupCount, lookupRecord, |
| lookup_context); |
| } |
| |
| const Coverage &get_coverage () const { return this+coverageZ[0]; } |
| |
| bool apply (hb_ot_apply_context_t *c) const |
| { |
| TRACE_APPLY (this); |
| unsigned int index = (this+coverageZ[0]).get_coverage (c->buffer->cur().codepoint); |
| if (likely (index == NOT_COVERED)) return_trace (false); |
| |
| const LookupRecord *lookupRecord = &StructAfter<LookupRecord> (coverageZ.as_array (glyphCount)); |
| struct ContextApplyLookupContext lookup_context = { |
| {match_coverage}, |
| this |
| }; |
| return_trace (context_apply_lookup (c, glyphCount, (const HBUINT16 *) (coverageZ.arrayZ + 1), lookupCount, lookupRecord, lookup_context)); |
| } |
| |
| bool subset (hb_subset_context_t *c) const |
| { |
| TRACE_SUBSET (this); |
| auto *out = c->serializer->start_embed (this); |
| if (unlikely (!c->serializer->extend_min (out))) return_trace (false); |
| |
| out->format = format; |
| out->glyphCount = glyphCount; |
| |
| auto coverages = coverageZ.as_array (glyphCount); |
| |
| for (const Offset16To<Coverage>& offset : coverages) |
| { |
| /* TODO(subset) This looks like should not be necessary to write this way. */ |
| auto *o = c->serializer->allocate_size<Offset16To<Coverage>> (Offset16To<Coverage>::static_size); |
| if (unlikely (!o)) return_trace (false); |
| if (!o->serialize_subset (c, offset, this)) return_trace (false); |
| } |
| |
| const auto& lookupRecord = StructAfter<UnsizedArrayOf<LookupRecord>> (coverageZ.as_array (glyphCount)); |
| const hb_map_t *lookup_map = c->table_tag == HB_OT_TAG_GSUB ? c->plan->gsub_lookups : c->plan->gpos_lookups; |
| |
| |
| unsigned count = serialize_lookuprecord_array (c->serializer, lookupRecord.as_array (lookupCount), lookup_map); |
| return_trace (c->serializer->check_assign (out->lookupCount, count, HB_SERIALIZE_ERROR_INT_OVERFLOW)); |
| } |
| |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| if (!c->check_struct (this)) return_trace (false); |
| unsigned int count = glyphCount; |
| if (!count) return_trace (false); /* We want to access coverageZ[0] freely. */ |
| if (!c->check_array (coverageZ.arrayZ, count)) return_trace (false); |
| for (unsigned int i = 0; i < count; i++) |
| if (!coverageZ[i].sanitize (c, this)) return_trace (false); |
| const LookupRecord *lookupRecord = &StructAfter<LookupRecord> (coverageZ.as_array (glyphCount)); |
| return_trace (c->check_array (lookupRecord, lookupCount)); |
| } |
| |
| protected: |
| HBUINT16 format; /* Format identifier--format = 3 */ |
| HBUINT16 glyphCount; /* Number of glyphs in the input glyph |
| * sequence */ |
| HBUINT16 lookupCount; /* Number of LookupRecords */ |
| UnsizedArrayOf<Offset16To<Coverage>> |
| coverageZ; /* Array of offsets to Coverage |
| * table in glyph sequence order */ |
| /*UnsizedArrayOf<LookupRecord> |
| lookupRecordX;*/ /* Array of LookupRecords--in |
| * design order */ |
| public: |
| DEFINE_SIZE_ARRAY (6, coverageZ); |
| }; |
| |
| struct Context |
| { |
| template <typename context_t, typename ...Ts> |
| typename context_t::return_t dispatch (context_t *c, Ts&&... ds) const |
| { |
| TRACE_DISPATCH (this, u.format); |
| if (unlikely (!c->may_dispatch (this, &u.format))) return_trace (c->no_dispatch_return_value ()); |
| switch (u.format) { |
| case 1: return_trace (c->dispatch (u.format1, std::forward<Ts> (ds)...)); |
| case 2: return_trace (c->dispatch (u.format2, std::forward<Ts> (ds)...)); |
| case 3: return_trace (c->dispatch (u.format3, std::forward<Ts> (ds)...)); |
| #ifndef HB_NO_BORING_EXPANSION |
| case 4: return_trace (c->dispatch (u.format4, std::forward<Ts> (ds)...)); |
| case 5: return_trace (c->dispatch (u.format5, std::forward<Ts> (ds)...)); |
| #endif |
| default:return_trace (c->default_return_value ()); |
| } |
| } |
| |
| protected: |
| union { |
| HBUINT16 format; /* Format identifier */ |
| ContextFormat1_4<SmallTypes> format1; |
| ContextFormat2_5<SmallTypes> format2; |
| ContextFormat3 format3; |
| #ifndef HB_NO_BORING_EXPANSION |
| ContextFormat1_4<MediumTypes> format4; |
| ContextFormat2_5<MediumTypes> format5; |
| #endif |
| } u; |
| }; |
| |
| |
| /* Chaining Contextual lookups */ |
| |
| struct ChainContextClosureLookupContext |
| { |
| ContextClosureFuncs funcs; |
| ContextFormat context_format; |
| const void *intersects_data[3]; |
| }; |
| |
| struct ChainContextCollectGlyphsLookupContext |
| { |
| ContextCollectGlyphsFuncs funcs; |
| const void *collect_data[3]; |
| }; |
| |
| struct ChainContextApplyLookupContext |
| { |
| ChainContextApplyFuncs funcs; |
| const void *match_data[3]; |
| }; |
| |
| template <typename HBUINT> |
| static inline bool chain_context_intersects (const hb_set_t *glyphs, |
| unsigned int backtrackCount, |
| const HBUINT backtrack[], |
| unsigned int inputCount, /* Including the first glyph (not matched) */ |
| const HBUINT input[], /* Array of input values--start with second glyph */ |
| unsigned int lookaheadCount, |
| const HBUINT lookahead[], |
| ChainContextClosureLookupContext &lookup_context) |
| { |
| return array_is_subset_of (glyphs, |
| backtrackCount, backtrack, |
| lookup_context.funcs.intersects, lookup_context.intersects_data[0]) |
| && array_is_subset_of (glyphs, |
| inputCount ? inputCount - 1 : 0, input, |
| lookup_context.funcs.intersects, lookup_context.intersects_data[1]) |
| && array_is_subset_of (glyphs, |
| lookaheadCount, lookahead, |
| lookup_context.funcs.intersects, lookup_context.intersects_data[2]); |
| } |
| |
| template <typename HBUINT> |
| static inline void chain_context_closure_lookup (hb_closure_context_t *c, |
| unsigned int backtrackCount, |
| const HBUINT backtrack[], |
| unsigned int inputCount, /* Including the first glyph (not matched) */ |
| const HBUINT input[], /* Array of input values--start with second glyph */ |
| unsigned int lookaheadCount, |
| const HBUINT lookahead[], |
| unsigned int lookupCount, |
| const LookupRecord lookupRecord[], |
| unsigned value, |
| ChainContextClosureLookupContext &lookup_context) |
| { |
| if (chain_context_intersects (c->glyphs, |
| backtrackCount, backtrack, |
| inputCount, input, |
| lookaheadCount, lookahead, |
| lookup_context)) |
| context_closure_recurse_lookups (c, |
| inputCount, input, |
| lookupCount, lookupRecord, |
| value, |
| lookup_context.context_format, |
| lookup_context.intersects_data[1], |
| lookup_context.funcs.intersected_glyphs); |
| } |
| |
| template <typename HBUINT> |
| static inline void chain_context_collect_glyphs_lookup (hb_collect_glyphs_context_t *c, |
| unsigned int backtrackCount, |
| const HBUINT backtrack[], |
| unsigned int inputCount, /* Including the first glyph (not matched) */ |
| const HBUINT input[], /* Array of input values--start with second glyph */ |
| unsigned int lookaheadCount, |
| const HBUINT lookahead[], |
| unsigned int lookupCount, |
| const LookupRecord lookupRecord[], |
| ChainContextCollectGlyphsLookupContext &lookup_context) |
| { |
| collect_array (c, c->before, |
| backtrackCount, backtrack, |
| lookup_context.funcs.collect, lookup_context.collect_data[0]); |
| collect_array (c, c->input, |
| inputCount ? inputCount - 1 : 0, input, |
| lookup_context.funcs.collect, lookup_context.collect_data[1]); |
| collect_array (c, c->after, |
| lookaheadCount, lookahead, |
| lookup_context.funcs.collect, lookup_context.collect_data[2]); |
| recurse_lookups (c, |
| lookupCount, lookupRecord); |
| } |
| |
| template <typename HBUINT> |
| static inline bool chain_context_would_apply_lookup (hb_would_apply_context_t *c, |
| unsigned int backtrackCount, |
| const HBUINT backtrack[] HB_UNUSED, |
| unsigned int inputCount, /* Including the first glyph (not matched) */ |
| const HBUINT input[], /* Array of input values--start with second glyph */ |
| unsigned int lookaheadCount, |
| const HBUINT lookahead[] HB_UNUSED, |
| unsigned int lookupCount HB_UNUSED, |
| const LookupRecord lookupRecord[] HB_UNUSED, |
| ChainContextApplyLookupContext &lookup_context) |
| { |
| return (c->zero_context ? !backtrackCount && !lookaheadCount : true) |
| && would_match_input (c, |
| inputCount, input, |
| lookup_context.funcs.match[1], lookup_context.match_data[1]); |
| } |
| |
| template <typename HBUINT> |
| static inline bool chain_context_apply_lookup (hb_ot_apply_context_t *c, |
| unsigned int backtrackCount, |
| const HBUINT backtrack[], |
| unsigned int inputCount, /* Including the first glyph (not matched) */ |
| const HBUINT input[], /* Array of input values--start with second glyph */ |
| unsigned int lookaheadCount, |
| const HBUINT lookahead[], |
| unsigned int lookupCount, |
| const LookupRecord lookupRecord[], |
| ChainContextApplyLookupContext &lookup_context) |
| { |
| unsigned end_index = c->buffer->idx; |
| unsigned match_end = 0; |
| unsigned match_positions[HB_MAX_CONTEXT_LENGTH]; |
| if (!(match_input (c, |
| inputCount, input, |
| lookup_context.funcs.match[1], lookup_context.match_data[1], |
| &match_end, match_positions) && (end_index = match_end) |
| && match_lookahead (c, |
| lookaheadCount, lookahead, |
| lookup_context.funcs.match[2], lookup_context.match_data[2], |
| match_end, &end_index))) |
| { |
| c->buffer->unsafe_to_concat (c->buffer->idx, end_index); |
| return false; |
| } |
| |
| unsigned start_index = c->buffer->out_len; |
| if (!match_backtrack (c, |
| backtrackCount, backtrack, |
| lookup_context.funcs.match[0], lookup_context.match_data[0], |
| &start_index)) |
| { |
| c->buffer->unsafe_to_concat_from_outbuffer (start_index, end_index); |
| return false; |
| } |
| |
| c->buffer->unsafe_to_break_from_outbuffer (start_index, end_index); |
| apply_lookup (c, |
| inputCount, match_positions, |
| lookupCount, lookupRecord, |
| match_end); |
| return true; |
| } |
| |
| template <typename Types> |
| struct ChainRule |
| { |
| bool intersects (const hb_set_t *glyphs, ChainContextClosureLookupContext &lookup_context) const |
| { |
| const auto &input = StructAfter<decltype (inputX)> (backtrack); |
| const auto &lookahead = StructAfter<decltype (lookaheadX)> (input); |
| return chain_context_intersects (glyphs, |
| backtrack.len, backtrack.arrayZ, |
| input.lenP1, input.arrayZ, |
| lookahead.len, lookahead.arrayZ, |
| lookup_context); |
| } |
| |
| void closure (hb_closure_context_t *c, unsigned value, |
| ChainContextClosureLookupContext &lookup_context) const |
| { |
| if (unlikely (c->lookup_limit_exceeded ())) return; |
| |
| const auto &input = StructAfter<decltype (inputX)> (backtrack); |
| const auto &lookahead = StructAfter<decltype (lookaheadX)> (input); |
| const auto &lookup = StructAfter<decltype (lookupX)> (lookahead); |
| chain_context_closure_lookup (c, |
| backtrack.len, backtrack.arrayZ, |
| input.lenP1, input.arrayZ, |
| lookahead.len, lookahead.arrayZ, |
| lookup.len, lookup.arrayZ, |
| value, |
| lookup_context); |
| } |
| |
| void closure_lookups (hb_closure_lookups_context_t *c, |
| ChainContextClosureLookupContext &lookup_context) const |
| { |
| if (unlikely (c->lookup_limit_exceeded ())) return; |
| if (!intersects (c->glyphs, lookup_context)) return; |
| |
| const auto &input = StructAfter<decltype (inputX)> (backtrack); |
| const auto &lookahead = StructAfter<decltype (lookaheadX)> (input); |
| const auto &lookup = StructAfter<decltype (lookupX)> (lookahead); |
| recurse_lookups (c, lookup.len, lookup.arrayZ); |
| } |
| |
| void collect_glyphs (hb_collect_glyphs_context_t *c, |
| ChainContextCollectGlyphsLookupContext &lookup_context) const |
| { |
| const auto &input = StructAfter<decltype (inputX)> (backtrack); |
| const auto &lookahead = StructAfter<decltype (lookaheadX)> (input); |
| const auto &lookup = StructAfter<decltype (lookupX)> (lookahead); |
| chain_context_collect_glyphs_lookup (c, |
| backtrack.len, backtrack.arrayZ, |
| input.lenP1, input.arrayZ, |
| lookahead.len, lookahead.arrayZ, |
| lookup.len, lookup.arrayZ, |
| lookup_context); |
| } |
| |
| bool would_apply (hb_would_apply_context_t *c, |
| ChainContextApplyLookupContext &lookup_context) const |
|