/* * 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_PRIVATE_HH #define HB_OT_LAYOUT_GSUBGPOS_PRIVATE_HH #include "hb-buffer-private.hh" #include "hb-ot-layout-gdef-table.hh" /* unique ligature id */ /* component number in the ligature (0 = base) */ static inline void set_lig_props (hb_glyph_info_t &info, unsigned int lig_id, unsigned int lig_comp) { info.lig_props() = (lig_id << 4) | (lig_comp & 0x0F); } static inline unsigned int get_lig_id (hb_glyph_info_t &info) { return info.lig_props() >> 4; } static inline unsigned int get_lig_comp (hb_glyph_info_t &info) { return info.lig_props() & 0x0F; } static inline uint8_t allocate_lig_id (hb_buffer_t *buffer) { uint8_t lig_id = buffer->next_serial () & 0x0F; if (unlikely (!lig_id)) lig_id = allocate_lig_id (buffer); /* in case of overflow */ return lig_id; } #ifndef HB_DEBUG_CLOSURE #define HB_DEBUG_CLOSURE (HB_DEBUG+0) #endif #define TRACE_CLOSURE() \ hb_auto_trace_t trace (&c->debug_depth, "CLOSURE", this, HB_FUNC, ""); /* TODO Add TRACE_RETURN annotation for would_apply */ struct hb_closure_context_t { hb_face_t *face; hb_set_t *glyphs; unsigned int nesting_level_left; unsigned int debug_depth; hb_closure_context_t (hb_face_t *face_, hb_set_t *glyphs_, unsigned int nesting_level_left_ = MAX_NESTING_LEVEL) : face (face_), glyphs (glyphs_), nesting_level_left (nesting_level_left_), debug_depth (0) {} }; #ifndef HB_DEBUG_APPLY #define HB_DEBUG_APPLY (HB_DEBUG+0) #endif #define TRACE_APPLY() \ hb_auto_trace_t trace (&c->debug_depth, "APPLY", this, HB_FUNC, "idx %d codepoint %u", c->buffer->idx, c->buffer->cur().codepoint); struct hb_apply_context_t { hb_font_t *font; hb_face_t *face; hb_buffer_t *buffer; hb_direction_t direction; hb_mask_t lookup_mask; unsigned int nesting_level_left; unsigned int lookup_props; unsigned int property; /* propety of first glyph */ unsigned int debug_depth; hb_apply_context_t (hb_font_t *font_, hb_face_t *face_, hb_buffer_t *buffer_, hb_mask_t lookup_mask_) : font (font_), face (face_), buffer (buffer_), direction (buffer_->props.direction), lookup_mask (lookup_mask_), nesting_level_left (MAX_NESTING_LEVEL), lookup_props (0), property (0), debug_depth (0) {} void set_lookup (const Lookup &l) { lookup_props = l.get_props (); } struct mark_skipping_forward_iterator_t { inline mark_skipping_forward_iterator_t (hb_apply_context_t *c_, unsigned int start_index_, unsigned int num_items_, bool context_match = false) { c = c_; idx = start_index_; num_items = num_items_; mask = context_match ? -1 : c->lookup_mask; syllable = context_match ? 0 : c->buffer->cur().syllable (); end = c->buffer->len; } inline bool has_no_chance (void) const { return unlikely (num_items && idx + num_items >= end); } inline bool reject (void) { num_items++; } inline bool next (unsigned int *property_out, unsigned int lookup_props) { assert (num_items > 0); do { if (has_no_chance ()) return false; idx++; } while (_hb_ot_layout_skip_mark (c->face, &c->buffer->info[idx], lookup_props, property_out)); num_items--; return (c->buffer->info[idx].mask & mask) && (!syllable || syllable == c->buffer->info[idx].syllable ()); } inline bool next (unsigned int *property_out = NULL) { return next (property_out, c->lookup_props); } unsigned int idx; private: hb_apply_context_t *c; unsigned int num_items; hb_mask_t mask; uint8_t syllable; unsigned int end; }; struct mark_skipping_backward_iterator_t { inline mark_skipping_backward_iterator_t (hb_apply_context_t *c_, unsigned int start_index_, unsigned int num_items_, hb_mask_t mask_ = 0, bool match_syllable_ = true) { c = c_; idx = start_index_; num_items = num_items_; mask = mask_ ? mask_ : c->lookup_mask; syllable = match_syllable_ ? c->buffer->cur().syllable () : 0; } inline bool has_no_chance (void) const { return unlikely (idx < num_items); } inline bool reject (void) { num_items++; } inline bool prev (unsigned int *property_out, unsigned int lookup_props) { assert (num_items > 0); do { if (has_no_chance ()) return false; idx--; } while (_hb_ot_layout_skip_mark (c->face, &c->buffer->out_info[idx], lookup_props, property_out)); num_items--; return (c->buffer->out_info[idx].mask & mask) && (!syllable || syllable == c->buffer->out_info[idx].syllable ()); } inline bool prev (unsigned int *property_out = NULL) { return prev (property_out, c->lookup_props); } unsigned int idx; private: hb_apply_context_t *c; unsigned int num_items; hb_mask_t mask; uint8_t syllable; }; inline bool should_mark_skip_current_glyph (void) const { return _hb_ot_layout_skip_mark (face, &buffer->cur(), lookup_props, NULL); } inline void output_glyph (hb_codepoint_t glyph_index, unsigned int klass = 0) const { buffer->cur().props_cache() = klass; /*XXX if has gdef? */ buffer->output_glyph (glyph_index); } inline void replace_glyph (hb_codepoint_t glyph_index, unsigned int klass = 0) const { buffer->cur().props_cache() = klass; /*XXX if has gdef? */ buffer->replace_glyph (glyph_index); } inline void replace_glyphs (unsigned int num_in, unsigned int num_out, hb_codepoint_t *glyph_data, unsigned int klass = 0) const { buffer->cur().props_cache() = klass; /* XXX if has gdef? */ buffer->replace_glyphs (num_in, num_out, glyph_data); } }; typedef bool (*intersects_func_t) (hb_set_t *glyphs, const USHORT &value, const void *data); typedef bool (*match_func_t) (hb_codepoint_t glyph_id, const USHORT &value, const void *data); typedef void (*closure_lookup_func_t) (hb_closure_context_t *c, unsigned int lookup_index); typedef bool (*apply_lookup_func_t) (hb_apply_context_t *c, unsigned int lookup_index); struct ContextClosureFuncs { intersects_func_t intersects; closure_lookup_func_t closure; }; struct ContextApplyFuncs { match_func_t match; apply_lookup_func_t apply; }; static inline bool intersects_glyph (hb_set_t *glyphs, const USHORT &value, const void *data HB_UNUSED) { return glyphs->has (value); } static inline bool intersects_class (hb_set_t *glyphs, const USHORT &value, const void *data) { const ClassDef &class_def = *reinterpret_cast(data); return class_def.intersects_class (glyphs, value); } static inline bool intersects_coverage (hb_set_t *glyphs, const USHORT &value, const void *data) { const OffsetTo &coverage = (const OffsetTo&)value; return (data+coverage).intersects (glyphs); } static inline bool intersects_array (hb_closure_context_t *c, unsigned int count, const USHORT values[], intersects_func_t intersects_func, const void *intersects_data) { for (unsigned int i = 0; i < count; i++) if (likely (!intersects_func (c->glyphs, values[i], intersects_data))) return false; return true; } static inline bool match_glyph (hb_codepoint_t glyph_id, const USHORT &value, const void *data HB_UNUSED) { return glyph_id == value; } static inline bool match_class (hb_codepoint_t glyph_id, const USHORT &value, const void *data) { const ClassDef &class_def = *reinterpret_cast(data); return class_def.get_class (glyph_id) == value; } static inline bool match_coverage (hb_codepoint_t glyph_id, const USHORT &value, const void *data) { const OffsetTo &coverage = (const OffsetTo&)value; return (data+coverage).get_coverage (glyph_id) != NOT_COVERED; } static inline bool match_input (hb_apply_context_t *c, unsigned int count, /* Including the first glyph (not matched) */ const USHORT input[], /* Array of input values--start with second glyph */ match_func_t match_func, const void *match_data, unsigned int *end_offset = NULL) { hb_apply_context_t::mark_skipping_forward_iterator_t skippy_iter (c, c->buffer->idx, count - 1); if (skippy_iter.has_no_chance ()) return false; for (unsigned int i = 1; i < count; i++) { if (!skippy_iter.next ()) return false; if (likely (!match_func (c->buffer->info[skippy_iter.idx].codepoint, input[i - 1], match_data))) return false; } if (end_offset) *end_offset = skippy_iter.idx - c->buffer->idx + 1; return true; } static inline bool match_backtrack (hb_apply_context_t *c, unsigned int count, const USHORT backtrack[], match_func_t match_func, const void *match_data) { hb_apply_context_t::mark_skipping_backward_iterator_t skippy_iter (c, c->buffer->backtrack_len (), count, true); if (skippy_iter.has_no_chance ()) return false; for (unsigned int i = 0; i < count; i++) { if (!skippy_iter.prev ()) return false; if (likely (!match_func (c->buffer->out_info[skippy_iter.idx].codepoint, backtrack[i], match_data))) return false; } return true; } static inline bool match_lookahead (hb_apply_context_t *c, unsigned int count, const USHORT lookahead[], match_func_t match_func, const void *match_data, unsigned int offset) { hb_apply_context_t::mark_skipping_forward_iterator_t skippy_iter (c, c->buffer->idx + offset - 1, count, true); if (skippy_iter.has_no_chance ()) return false; for (unsigned int i = 0; i < count; i++) { if (!skippy_iter.next ()) return false; if (likely (!match_func (c->buffer->info[skippy_iter.idx].codepoint, lookahead[i], match_data))) return false; } return true; } struct LookupRecord { inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); return TRACE_RETURN (c->check_struct (this)); } USHORT sequenceIndex; /* Index into current glyph * sequence--first glyph = 0 */ USHORT lookupListIndex; /* Lookup to apply to that * position--zero--based */ public: DEFINE_SIZE_STATIC (4); }; static inline void closure_lookup (hb_closure_context_t *c, unsigned int lookupCount, const LookupRecord lookupRecord[], /* Array of LookupRecords--in design order */ closure_lookup_func_t closure_func) { for (unsigned int i = 0; i < lookupCount; i++) closure_func (c, lookupRecord->lookupListIndex); } static inline bool apply_lookup (hb_apply_context_t *c, unsigned int count, /* Including the first glyph */ unsigned int lookupCount, const LookupRecord lookupRecord[], /* Array of LookupRecords--in design order */ apply_lookup_func_t apply_func) { unsigned int end = c->buffer->len; if (unlikely (count == 0 || c->buffer->idx + count > end)) return false; /* TODO We don't support lookupRecord arrays that are not increasing: * Should be easy for in_place ones at least. */ /* Note: If sublookup is reverse, it will underflow after the first loop * and we jump out of it. Not entirely disastrous. So we don't check * for reverse lookup here. */ for (unsigned int i = 0; i < count; /* NOP */) { if (unlikely (c->buffer->idx == end)) return true; while (c->should_mark_skip_current_glyph ()) { /* No lookup applied for this index */ c->buffer->next_glyph (); if (unlikely (c->buffer->idx == end)) return true; } if (lookupCount && i == lookupRecord->sequenceIndex) { unsigned int old_pos = c->buffer->idx; /* Apply a lookup */ bool done = apply_func (c, lookupRecord->lookupListIndex); lookupRecord++; lookupCount--; /* Err, this is wrong if the lookup jumped over some glyphs */ i += c->buffer->idx - old_pos; if (unlikely (c->buffer->idx == end)) return true; if (!done) goto not_applied; } else { not_applied: /* No lookup applied for this index */ c->buffer->next_glyph (); i++; } } return true; } /* Contextual lookups */ struct ContextClosureLookupContext { ContextClosureFuncs funcs; const void *intersects_data; }; struct ContextApplyLookupContext { ContextApplyFuncs funcs; const void *match_data; }; static inline void context_closure_lookup (hb_closure_context_t *c, unsigned int inputCount, /* Including the first glyph (not matched) */ const USHORT input[], /* Array of input values--start with second glyph */ unsigned int lookupCount, const LookupRecord lookupRecord[], ContextClosureLookupContext &lookup_context) { if (intersects_array (c, inputCount ? inputCount - 1 : 0, input, lookup_context.funcs.intersects, lookup_context.intersects_data)) closure_lookup (c, lookupCount, lookupRecord, lookup_context.funcs.closure); } static inline bool context_apply_lookup (hb_apply_context_t *c, unsigned int inputCount, /* Including the first glyph (not matched) */ const USHORT input[], /* Array of input values--start with second glyph */ unsigned int lookupCount, const LookupRecord lookupRecord[], ContextApplyLookupContext &lookup_context) { return match_input (c, inputCount, input, lookup_context.funcs.match, lookup_context.match_data) && apply_lookup (c, inputCount, lookupCount, lookupRecord, lookup_context.funcs.apply); } struct Rule { friend struct RuleSet; private: inline void closure (hb_closure_context_t *c, ContextClosureLookupContext &lookup_context) const { TRACE_CLOSURE (); const LookupRecord *lookupRecord = &StructAtOffset (input, input[0].static_size * (inputCount ? inputCount - 1 : 0)); context_closure_lookup (c, inputCount, input, lookupCount, lookupRecord, lookup_context); } inline bool apply (hb_apply_context_t *c, ContextApplyLookupContext &lookup_context) const { TRACE_APPLY (); const LookupRecord *lookupRecord = &StructAtOffset (input, input[0].static_size * (inputCount ? inputCount - 1 : 0)); return TRACE_RETURN (context_apply_lookup (c, inputCount, input, lookupCount, lookupRecord, lookup_context)); } public: inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); return inputCount.sanitize (c) && lookupCount.sanitize (c) && c->check_range (input, input[0].static_size * inputCount + lookupRecordX[0].static_size * lookupCount); } private: USHORT inputCount; /* Total number of glyphs in input * glyph sequence--includes the first * glyph */ USHORT lookupCount; /* Number of LookupRecords */ USHORT input[VAR]; /* Array of match inputs--start with * second glyph */ LookupRecord lookupRecordX[VAR]; /* Array of LookupRecords--in * design order */ public: DEFINE_SIZE_ARRAY2 (4, input, lookupRecordX); }; struct RuleSet { inline void closure (hb_closure_context_t *c, ContextClosureLookupContext &lookup_context) const { TRACE_CLOSURE (); unsigned int num_rules = rule.len; for (unsigned int i = 0; i < num_rules; i++) (this+rule[i]).closure (c, lookup_context); } inline bool apply (hb_apply_context_t *c, ContextApplyLookupContext &lookup_context) const { TRACE_APPLY (); unsigned int num_rules = rule.len; for (unsigned int i = 0; i < num_rules; i++) { if ((this+rule[i]).apply (c, lookup_context)) return TRACE_RETURN (true); } return TRACE_RETURN (false); } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); return TRACE_RETURN (rule.sanitize (c, this)); } private: OffsetArrayOf rule; /* Array of Rule tables * ordered by preference */ public: DEFINE_SIZE_ARRAY (2, rule); }; struct ContextFormat1 { friend struct Context; private: inline void closure (hb_closure_context_t *c, closure_lookup_func_t closure_func) const { TRACE_CLOSURE (); const Coverage &cov = (this+coverage); struct ContextClosureLookupContext lookup_context = { {intersects_glyph, closure_func}, NULL }; unsigned int count = ruleSet.len; for (unsigned int i = 0; i < count; i++) if (cov.intersects_coverage (c->glyphs, i)) { const RuleSet &rule_set = this+ruleSet[i]; rule_set.closure (c, lookup_context); } } inline bool apply (hb_apply_context_t *c, apply_lookup_func_t apply_func) const { TRACE_APPLY (); unsigned int index = (this+coverage) (c->buffer->cur().codepoint); if (likely (index == NOT_COVERED)) return TRACE_RETURN (false); const RuleSet &rule_set = this+ruleSet[index]; struct ContextApplyLookupContext lookup_context = { {match_glyph, apply_func}, NULL }; return TRACE_RETURN (rule_set.apply (c, lookup_context)); } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); return TRACE_RETURN (coverage.sanitize (c, this) && ruleSet.sanitize (c, this)); } private: USHORT format; /* Format identifier--format = 1 */ OffsetTo coverage; /* Offset to Coverage table--from * beginning of table */ OffsetArrayOf ruleSet; /* Array of RuleSet tables * ordered by Coverage Index */ public: DEFINE_SIZE_ARRAY (6, ruleSet); }; struct ContextFormat2 { friend struct Context; private: inline void closure (hb_closure_context_t *c, closure_lookup_func_t closure_func) const { TRACE_CLOSURE (); if (!(this+coverage).intersects (c->glyphs)) return; const ClassDef &class_def = this+classDef; struct ContextClosureLookupContext lookup_context = { {intersects_class, closure_func}, NULL }; unsigned int count = ruleSet.len; for (unsigned int i = 0; i < count; i++) if (class_def.intersects_class (c->glyphs, i)) { const RuleSet &rule_set = this+ruleSet[i]; rule_set.closure (c, lookup_context); } } inline bool apply (hb_apply_context_t *c, apply_lookup_func_t apply_func) const { TRACE_APPLY (); unsigned int index = (this+coverage) (c->buffer->cur().codepoint); if (likely (index == NOT_COVERED)) return TRACE_RETURN (false); const ClassDef &class_def = this+classDef; index = class_def (c->buffer->cur().codepoint); const RuleSet &rule_set = this+ruleSet[index]; struct ContextApplyLookupContext lookup_context = { {match_class, apply_func}, &class_def }; return TRACE_RETURN (rule_set.apply (c, lookup_context)); } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); return TRACE_RETURN (coverage.sanitize (c, this) && classDef.sanitize (c, this) && ruleSet.sanitize (c, this)); } private: USHORT format; /* Format identifier--format = 2 */ OffsetTo coverage; /* Offset to Coverage table--from * beginning of table */ OffsetTo classDef; /* Offset to glyph ClassDef table--from * beginning of table */ OffsetArrayOf ruleSet; /* Array of RuleSet tables * ordered by class */ public: DEFINE_SIZE_ARRAY (8, ruleSet); }; struct ContextFormat3 { friend struct Context; private: inline void closure (hb_closure_context_t *c, closure_lookup_func_t closure_func) const { TRACE_CLOSURE (); if (!(this+coverage[0]).intersects (c->glyphs)) return; const LookupRecord *lookupRecord = &StructAtOffset (coverage, coverage[0].static_size * glyphCount); struct ContextClosureLookupContext lookup_context = { {intersects_coverage, closure_func}, this }; context_closure_lookup (c, glyphCount, (const USHORT *) (coverage + 1), lookupCount, lookupRecord, lookup_context); } inline bool apply (hb_apply_context_t *c, apply_lookup_func_t apply_func) const { TRACE_APPLY (); unsigned int index = (this+coverage[0]) (c->buffer->cur().codepoint); if (likely (index == NOT_COVERED)) return TRACE_RETURN (false); const LookupRecord *lookupRecord = &StructAtOffset (coverage, coverage[0].static_size * glyphCount); struct ContextApplyLookupContext lookup_context = { {match_coverage, apply_func}, this }; return TRACE_RETURN (context_apply_lookup (c, glyphCount, (const USHORT *) (coverage + 1), lookupCount, lookupRecord, lookup_context)); } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); if (!c->check_struct (this)) return TRACE_RETURN (false); unsigned int count = glyphCount; if (!c->check_array (coverage, coverage[0].static_size, count)) return TRACE_RETURN (false); for (unsigned int i = 0; i < count; i++) if (!coverage[i].sanitize (c, this)) return TRACE_RETURN (false); LookupRecord *lookupRecord = &StructAtOffset (coverage, coverage[0].static_size * count); return TRACE_RETURN (c->check_array (lookupRecord, lookupRecord[0].static_size, lookupCount)); } private: USHORT format; /* Format identifier--format = 3 */ USHORT glyphCount; /* Number of glyphs in the input glyph * sequence */ USHORT lookupCount; /* Number of LookupRecords */ OffsetTo coverage[VAR]; /* Array of offsets to Coverage * table in glyph sequence order */ LookupRecord lookupRecordX[VAR]; /* Array of LookupRecords--in * design order */ public: DEFINE_SIZE_ARRAY2 (6, coverage, lookupRecordX); }; struct Context { protected: inline void closure (hb_closure_context_t *c, closure_lookup_func_t closure_func) const { TRACE_CLOSURE (); switch (u.format) { case 1: u.format1.closure (c, closure_func); break; case 2: u.format2.closure (c, closure_func); break; case 3: u.format3.closure (c, closure_func); break; default: break; } } inline bool apply (hb_apply_context_t *c, apply_lookup_func_t apply_func) const { TRACE_APPLY (); switch (u.format) { case 1: return TRACE_RETURN (u.format1.apply (c, apply_func)); case 2: return TRACE_RETURN (u.format2.apply (c, apply_func)); case 3: return TRACE_RETURN (u.format3.apply (c, apply_func)); default:return TRACE_RETURN (false); } } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); if (!u.format.sanitize (c)) return TRACE_RETURN (false); switch (u.format) { case 1: return TRACE_RETURN (u.format1.sanitize (c)); case 2: return TRACE_RETURN (u.format2.sanitize (c)); case 3: return TRACE_RETURN (u.format3.sanitize (c)); default:return TRACE_RETURN (true); } } private: union { USHORT format; /* Format identifier */ ContextFormat1 format1; ContextFormat2 format2; ContextFormat3 format3; } u; }; /* Chaining Contextual lookups */ struct ChainContextClosureLookupContext { ContextClosureFuncs funcs; const void *intersects_data[3]; }; struct ChainContextApplyLookupContext { ContextApplyFuncs funcs; const void *match_data[3]; }; static inline void chain_context_closure_lookup (hb_closure_context_t *c, unsigned int backtrackCount, const USHORT backtrack[], unsigned int inputCount, /* Including the first glyph (not matched) */ const USHORT input[], /* Array of input values--start with second glyph */ unsigned int lookaheadCount, const USHORT lookahead[], unsigned int lookupCount, const LookupRecord lookupRecord[], ChainContextClosureLookupContext &lookup_context) { if (intersects_array (c, backtrackCount, backtrack, lookup_context.funcs.intersects, lookup_context.intersects_data[0]) && intersects_array (c, inputCount ? inputCount - 1 : 0, input, lookup_context.funcs.intersects, lookup_context.intersects_data[1]) && intersects_array (c, lookaheadCount, lookahead, lookup_context.funcs.intersects, lookup_context.intersects_data[2])) closure_lookup (c, lookupCount, lookupRecord, lookup_context.funcs.closure); } static inline bool chain_context_apply_lookup (hb_apply_context_t *c, unsigned int backtrackCount, const USHORT backtrack[], unsigned int inputCount, /* Including the first glyph (not matched) */ const USHORT input[], /* Array of input values--start with second glyph */ unsigned int lookaheadCount, const USHORT lookahead[], unsigned int lookupCount, const LookupRecord lookupRecord[], ChainContextApplyLookupContext &lookup_context) { unsigned int lookahead_offset; return match_backtrack (c, backtrackCount, backtrack, lookup_context.funcs.match, lookup_context.match_data[0]) && match_input (c, inputCount, input, lookup_context.funcs.match, lookup_context.match_data[1], &lookahead_offset) && match_lookahead (c, lookaheadCount, lookahead, lookup_context.funcs.match, lookup_context.match_data[2], lookahead_offset) && apply_lookup (c, inputCount, lookupCount, lookupRecord, lookup_context.funcs.apply); } struct ChainRule { friend struct ChainRuleSet; private: inline void closure (hb_closure_context_t *c, ChainContextClosureLookupContext &lookup_context) const { TRACE_CLOSURE (); const HeadlessArrayOf &input = StructAfter > (backtrack); const ArrayOf &lookahead = StructAfter > (input); const ArrayOf &lookup = StructAfter > (lookahead); chain_context_closure_lookup (c, backtrack.len, backtrack.array, input.len, input.array, lookahead.len, lookahead.array, lookup.len, lookup.array, lookup_context); } inline bool apply (hb_apply_context_t *c, ChainContextApplyLookupContext &lookup_context) const { TRACE_APPLY (); const HeadlessArrayOf &input = StructAfter > (backtrack); const ArrayOf &lookahead = StructAfter > (input); const ArrayOf &lookup = StructAfter > (lookahead); return TRACE_RETURN (chain_context_apply_lookup (c, backtrack.len, backtrack.array, input.len, input.array, lookahead.len, lookahead.array, lookup.len, lookup.array, lookup_context)); } public: inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); if (!backtrack.sanitize (c)) return TRACE_RETURN (false); HeadlessArrayOf &input = StructAfter > (backtrack); if (!input.sanitize (c)) return TRACE_RETURN (false); ArrayOf &lookahead = StructAfter > (input); if (!lookahead.sanitize (c)) return TRACE_RETURN (false); ArrayOf &lookup = StructAfter > (lookahead); return TRACE_RETURN (lookup.sanitize (c)); } private: ArrayOf backtrack; /* Array of backtracking values * (to be matched before the input * sequence) */ HeadlessArrayOf inputX; /* Array of input values (start with * second glyph) */ ArrayOf lookaheadX; /* Array of lookahead values's (to be * matched after the input sequence) */ ArrayOf lookupX; /* Array of LookupRecords--in * design order) */ public: DEFINE_SIZE_MIN (8); }; struct ChainRuleSet { inline void closure (hb_closure_context_t *c, ChainContextClosureLookupContext &lookup_context) const { TRACE_CLOSURE (); unsigned int num_rules = rule.len; for (unsigned int i = 0; i < num_rules; i++) (this+rule[i]).closure (c, lookup_context); } inline bool apply (hb_apply_context_t *c, ChainContextApplyLookupContext &lookup_context) const { TRACE_APPLY (); unsigned int num_rules = rule.len; for (unsigned int i = 0; i < num_rules; i++) if ((this+rule[i]).apply (c, lookup_context)) return TRACE_RETURN (true); return TRACE_RETURN (false); } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); return TRACE_RETURN (rule.sanitize (c, this)); } private: OffsetArrayOf rule; /* Array of ChainRule tables * ordered by preference */ public: DEFINE_SIZE_ARRAY (2, rule); }; struct ChainContextFormat1 { friend struct ChainContext; private: inline void closure (hb_closure_context_t *c, closure_lookup_func_t closure_func) const { TRACE_CLOSURE (); const Coverage &cov = (this+coverage); struct ChainContextClosureLookupContext lookup_context = { {intersects_glyph, closure_func}, {NULL, NULL, NULL} }; unsigned int count = ruleSet.len; for (unsigned int i = 0; i < count; i++) if (cov.intersects_coverage (c->glyphs, i)) { const ChainRuleSet &rule_set = this+ruleSet[i]; rule_set.closure (c, lookup_context); } } inline bool apply (hb_apply_context_t *c, apply_lookup_func_t apply_func) const { TRACE_APPLY (); unsigned int index = (this+coverage) (c->buffer->cur().codepoint); if (likely (index == NOT_COVERED)) return TRACE_RETURN (false); const ChainRuleSet &rule_set = this+ruleSet[index]; struct ChainContextApplyLookupContext lookup_context = { {match_glyph, apply_func}, {NULL, NULL, NULL} }; return TRACE_RETURN (rule_set.apply (c, lookup_context)); } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); return TRACE_RETURN (coverage.sanitize (c, this) && ruleSet.sanitize (c, this)); } private: USHORT format; /* Format identifier--format = 1 */ OffsetTo coverage; /* Offset to Coverage table--from * beginning of table */ OffsetArrayOf ruleSet; /* Array of ChainRuleSet tables * ordered by Coverage Index */ public: DEFINE_SIZE_ARRAY (6, ruleSet); }; struct ChainContextFormat2 { friend struct ChainContext; private: inline void closure (hb_closure_context_t *c, closure_lookup_func_t closure_func) const { TRACE_CLOSURE (); if (!(this+coverage).intersects (c->glyphs)) return; const ClassDef &backtrack_class_def = this+backtrackClassDef; const ClassDef &input_class_def = this+inputClassDef; const ClassDef &lookahead_class_def = this+lookaheadClassDef; struct ChainContextClosureLookupContext lookup_context = { {intersects_class, closure_func}, {&backtrack_class_def, &input_class_def, &lookahead_class_def} }; unsigned int count = ruleSet.len; for (unsigned int i = 0; i < count; i++) if (input_class_def.intersects_class (c->glyphs, i)) { const ChainRuleSet &rule_set = this+ruleSet[i]; rule_set.closure (c, lookup_context); } } inline bool apply (hb_apply_context_t *c, apply_lookup_func_t apply_func) const { TRACE_APPLY (); unsigned int index = (this+coverage) (c->buffer->cur().codepoint); if (likely (index == NOT_COVERED)) return TRACE_RETURN (false); const ClassDef &backtrack_class_def = this+backtrackClassDef; const ClassDef &input_class_def = this+inputClassDef; const ClassDef &lookahead_class_def = this+lookaheadClassDef; index = input_class_def (c->buffer->cur().codepoint); const ChainRuleSet &rule_set = this+ruleSet[index]; struct ChainContextApplyLookupContext lookup_context = { {match_class, apply_func}, {&backtrack_class_def, &input_class_def, &lookahead_class_def} }; return TRACE_RETURN (rule_set.apply (c, lookup_context)); } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); return TRACE_RETURN (coverage.sanitize (c, this) && backtrackClassDef.sanitize (c, this) && inputClassDef.sanitize (c, this) && lookaheadClassDef.sanitize (c, this) && ruleSet.sanitize (c, this)); } private: USHORT format; /* Format identifier--format = 2 */ OffsetTo coverage; /* Offset to Coverage table--from * beginning of table */ OffsetTo backtrackClassDef; /* Offset to glyph ClassDef table * containing backtrack sequence * data--from beginning of table */ OffsetTo inputClassDef; /* Offset to glyph ClassDef * table containing input sequence * data--from beginning of table */ OffsetTo lookaheadClassDef; /* Offset to glyph ClassDef table * containing lookahead sequence * data--from beginning of table */ OffsetArrayOf ruleSet; /* Array of ChainRuleSet tables * ordered by class */ public: DEFINE_SIZE_ARRAY (12, ruleSet); }; struct ChainContextFormat3 { friend struct ChainContext; private: inline void closure (hb_closure_context_t *c, closure_lookup_func_t closure_func) const { TRACE_CLOSURE (); const OffsetArrayOf &input = StructAfter > (backtrack); if (!(this+input[0]).intersects (c->glyphs)) return; const OffsetArrayOf &lookahead = StructAfter > (input); const ArrayOf &lookup = StructAfter > (lookahead); struct ChainContextClosureLookupContext lookup_context = { {intersects_coverage, closure_func}, {this, this, this} }; chain_context_closure_lookup (c, backtrack.len, (const USHORT *) backtrack.array, input.len, (const USHORT *) input.array + 1, lookahead.len, (const USHORT *) lookahead.array, lookup.len, lookup.array, lookup_context); } inline bool apply (hb_apply_context_t *c, apply_lookup_func_t apply_func) const { TRACE_APPLY (); const OffsetArrayOf &input = StructAfter > (backtrack); unsigned int index = (this+input[0]) (c->buffer->cur().codepoint); if (likely (index == NOT_COVERED)) return TRACE_RETURN (false); const OffsetArrayOf &lookahead = StructAfter > (input); const ArrayOf &lookup = StructAfter > (lookahead); struct ChainContextApplyLookupContext lookup_context = { {match_coverage, apply_func}, {this, this, this} }; return TRACE_RETURN (chain_context_apply_lookup (c, backtrack.len, (const USHORT *) backtrack.array, input.len, (const USHORT *) input.array + 1, lookahead.len, (const USHORT *) lookahead.array, lookup.len, lookup.array, lookup_context)); } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); if (!backtrack.sanitize (c, this)) return TRACE_RETURN (false); OffsetArrayOf &input = StructAfter > (backtrack); if (!input.sanitize (c, this)) return TRACE_RETURN (false); OffsetArrayOf &lookahead = StructAfter > (input); if (!lookahead.sanitize (c, this)) return TRACE_RETURN (false); ArrayOf &lookup = StructAfter > (lookahead); return TRACE_RETURN (lookup.sanitize (c)); } private: USHORT format; /* Format identifier--format = 3 */ OffsetArrayOf backtrack; /* Array of coverage tables * in backtracking sequence, in glyph * sequence order */ OffsetArrayOf inputX ; /* Array of coverage * tables in input sequence, in glyph * sequence order */ OffsetArrayOf lookaheadX; /* Array of coverage tables * in lookahead sequence, in glyph * sequence order */ ArrayOf lookupX; /* Array of LookupRecords--in * design order) */ public: DEFINE_SIZE_MIN (10); }; struct ChainContext { protected: inline void closure (hb_closure_context_t *c, closure_lookup_func_t closure_func) const { TRACE_CLOSURE (); switch (u.format) { case 1: u.format1.closure (c, closure_func); break; case 2: u.format2.closure (c, closure_func); break; case 3: u.format3.closure (c, closure_func); break; default: break; } } inline bool apply (hb_apply_context_t *c, apply_lookup_func_t apply_func) const { TRACE_APPLY (); switch (u.format) { case 1: return TRACE_RETURN (u.format1.apply (c, apply_func)); case 2: return TRACE_RETURN (u.format2.apply (c, apply_func)); case 3: return TRACE_RETURN (u.format3.apply (c, apply_func)); default:return TRACE_RETURN (false); } } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); if (!u.format.sanitize (c)) return TRACE_RETURN (false); switch (u.format) { case 1: return TRACE_RETURN (u.format1.sanitize (c)); case 2: return TRACE_RETURN (u.format2.sanitize (c)); case 3: return TRACE_RETURN (u.format3.sanitize (c)); default:return TRACE_RETURN (true); } } private: union { USHORT format; /* Format identifier */ ChainContextFormat1 format1; ChainContextFormat2 format2; ChainContextFormat3 format3; } u; }; struct ExtensionFormat1 { friend struct Extension; protected: inline unsigned int get_type (void) const { return extensionLookupType; } inline unsigned int get_offset (void) const { return extensionOffset; } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); return TRACE_RETURN (c->check_struct (this)); } private: USHORT format; /* Format identifier. Set to 1. */ USHORT extensionLookupType; /* Lookup type of subtable referenced * by ExtensionOffset (i.e. the * extension subtable). */ ULONG extensionOffset; /* Offset to the extension subtable, * of lookup type subtable. */ public: DEFINE_SIZE_STATIC (8); }; struct Extension { inline unsigned int get_type (void) const { switch (u.format) { case 1: return u.format1.get_type (); default:return 0; } } inline unsigned int get_offset (void) const { switch (u.format) { case 1: return u.format1.get_offset (); default:return 0; } } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); if (!u.format.sanitize (c)) return TRACE_RETURN (false); switch (u.format) { case 1: return TRACE_RETURN (u.format1.sanitize (c)); default:return TRACE_RETURN (true); } } private: union { USHORT format; /* Format identifier */ ExtensionFormat1 format1; } u; }; /* * GSUB/GPOS Common */ struct GSUBGPOS { static const hb_tag_t GSUBTag = HB_OT_TAG_GSUB; static const hb_tag_t GPOSTag = HB_OT_TAG_GPOS; inline unsigned int get_script_count (void) const { return (this+scriptList).len; } inline const Tag& get_script_tag (unsigned int i) const { return (this+scriptList).get_tag (i); } inline unsigned int get_script_tags (unsigned int start_offset, unsigned int *script_count /* IN/OUT */, hb_tag_t *script_tags /* OUT */) const { return (this+scriptList).get_tags (start_offset, script_count, script_tags); } inline const Script& get_script (unsigned int i) const { return (this+scriptList)[i]; } inline bool find_script_index (hb_tag_t tag, unsigned int *index) const { return (this+scriptList).find_index (tag, index); } inline unsigned int get_feature_count (void) const { return (this+featureList).len; } inline const Tag& get_feature_tag (unsigned int i) const { return (this+featureList).get_tag (i); } inline unsigned int get_feature_tags (unsigned int start_offset, unsigned int *feature_count /* IN/OUT */, hb_tag_t *feature_tags /* OUT */) const { return (this+featureList).get_tags (start_offset, feature_count, feature_tags); } inline const Feature& get_feature (unsigned int i) const { return (this+featureList)[i]; } inline bool find_feature_index (hb_tag_t tag, unsigned int *index) const { return (this+featureList).find_index (tag, index); } inline unsigned int get_lookup_count (void) const { return (this+lookupList).len; } inline const Lookup& get_lookup (unsigned int i) const { return (this+lookupList)[i]; } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (); return TRACE_RETURN (version.sanitize (c) && likely (version.major == 1) && scriptList.sanitize (c, this) && featureList.sanitize (c, this) && lookupList.sanitize (c, this)); } protected: FixedVersion version; /* Version of the GSUB/GPOS table--initially set * to 0x00010000 */ OffsetTo scriptList; /* ScriptList table */ OffsetTo featureList; /* FeatureList table */ OffsetTo lookupList; /* LookupList table */ public: DEFINE_SIZE_STATIC (10); }; #endif /* HB_OT_LAYOUT_GSUBGPOS_PRIVATE_HH */