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Diffstat (limited to 'Build/source/libs/harfbuzz/harfbuzz-0.9.39/src/hb-ot-layout-gsubgpos-private.hh')
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1 files changed, 2293 insertions, 0 deletions
diff --git a/Build/source/libs/harfbuzz/harfbuzz-0.9.39/src/hb-ot-layout-gsubgpos-private.hh b/Build/source/libs/harfbuzz/harfbuzz-0.9.39/src/hb-ot-layout-gsubgpos-private.hh new file mode 100644 index 00000000000..cbc6840bc86 --- /dev/null +++ b/Build/source/libs/harfbuzz/harfbuzz-0.9.39/src/hb-ot-layout-gsubgpos-private.hh @@ -0,0 +1,2293 @@ +/* + * 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" +#include "hb-set-private.hh" + + +namespace OT { + + +#ifndef HB_DEBUG_CLOSURE +#define HB_DEBUG_CLOSURE (HB_DEBUG+0) +#endif + +#define TRACE_CLOSURE(this) \ + hb_auto_trace_t<HB_DEBUG_CLOSURE, hb_void_t> trace \ + (&c->debug_depth, c->get_name (), this, HB_FUNC, \ + ""); + +struct hb_closure_context_t +{ + inline const char *get_name (void) { return "CLOSURE"; } + static const unsigned int max_debug_depth = HB_DEBUG_CLOSURE; + typedef hb_void_t return_t; + typedef return_t (*recurse_func_t) (hb_closure_context_t *c, unsigned int lookup_index); + template <typename T, typename F> + inline bool may_dispatch (const T *obj, const F *format) { return true; } + template <typename T> + inline return_t dispatch (const T &obj) { obj.closure (this); return HB_VOID; } + static return_t default_return_value (void) { return HB_VOID; } + bool stop_sublookup_iteration (return_t r HB_UNUSED) const { return false; } + return_t recurse (unsigned int lookup_index) + { + if (unlikely (nesting_level_left == 0 || !recurse_func)) + return default_return_value (); + + nesting_level_left--; + recurse_func (this, lookup_index); + nesting_level_left++; + return HB_VOID; + } + + hb_face_t *face; + hb_set_t *glyphs; + recurse_func_t recurse_func; + 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_), + recurse_func (NULL), + nesting_level_left (nesting_level_left_), + debug_depth (0) {} + + void set_recurse_func (recurse_func_t func) { recurse_func = func; } +}; + + + +#ifndef HB_DEBUG_WOULD_APPLY +#define HB_DEBUG_WOULD_APPLY (HB_DEBUG+0) +#endif + +#define TRACE_WOULD_APPLY(this) \ + hb_auto_trace_t<HB_DEBUG_WOULD_APPLY, bool> trace \ + (&c->debug_depth, c->get_name (), this, HB_FUNC, \ + "%d glyphs", c->len); + +struct hb_would_apply_context_t +{ + inline const char *get_name (void) { return "WOULD_APPLY"; } + static const unsigned int max_debug_depth = HB_DEBUG_WOULD_APPLY; + typedef bool return_t; + template <typename T, typename F> + inline bool may_dispatch (const T *obj, const F *format) { return true; } + template <typename T> + inline return_t dispatch (const T &obj) { return obj.would_apply (this); } + static return_t default_return_value (void) { 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; + unsigned int debug_depth; + + 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_), + debug_depth (0) {} +}; + + + +#ifndef HB_DEBUG_COLLECT_GLYPHS +#define HB_DEBUG_COLLECT_GLYPHS (HB_DEBUG+0) +#endif + +#define TRACE_COLLECT_GLYPHS(this) \ + hb_auto_trace_t<HB_DEBUG_COLLECT_GLYPHS, hb_void_t> trace \ + (&c->debug_depth, c->get_name (), this, HB_FUNC, \ + ""); + +struct hb_collect_glyphs_context_t +{ + inline const char *get_name (void) { return "COLLECT_GLYPHS"; } + static const unsigned int max_debug_depth = HB_DEBUG_COLLECT_GLYPHS; + typedef hb_void_t return_t; + typedef return_t (*recurse_func_t) (hb_collect_glyphs_context_t *c, unsigned int lookup_index); + template <typename T, typename F> + inline bool may_dispatch (const T *obj, const F *format) { return true; } + template <typename T> + inline return_t dispatch (const T &obj) { obj.collect_glyphs (this); return HB_VOID; } + static return_t default_return_value (void) { return HB_VOID; } + bool stop_sublookup_iteration (return_t r HB_UNUSED) const { return false; } + return_t recurse (unsigned int lookup_index) + { + if (unlikely (nesting_level_left == 0 || !recurse_func)) + return default_return_value (); + + /* Note that GPOS sets recurse_func to NULL 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 HB_VOID; + + /* Return if new lookup was recursed to before. */ + if (recursed_lookups.has (lookup_index)) + return HB_VOID; + + 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); + + return HB_VOID; + } + + 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; + unsigned int debug_depth; + + 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_ = 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 (NULL), + recursed_lookups (), + nesting_level_left (nesting_level_left_), + debug_depth (0) + { + recursed_lookups.init (); + } + ~hb_collect_glyphs_context_t (void) + { + recursed_lookups.fini (); + } + + void set_recurse_func (recurse_func_t func) { recurse_func = func; } +}; + + + +#ifndef HB_DEBUG_GET_COVERAGE +#define HB_DEBUG_GET_COVERAGE (HB_DEBUG+0) +#endif + +template <typename set_t> +struct hb_add_coverage_context_t +{ + inline const char *get_name (void) { return "GET_COVERAGE"; } + static const unsigned int max_debug_depth = HB_DEBUG_GET_COVERAGE; + typedef const Coverage &return_t; + template <typename T, typename F> + inline bool may_dispatch (const T *obj, const F *format) { return true; } + template <typename T> + inline return_t dispatch (const T &obj) { return obj.get_coverage (); } + static return_t default_return_value (void) { return Null(Coverage); } + bool stop_sublookup_iteration (return_t r) const + { + r.add_coverage (set); + return false; + } + + hb_add_coverage_context_t (set_t *set_) : + set (set_), + debug_depth (0) {} + + set_t *set; + unsigned int debug_depth; +}; + + + +#ifndef HB_DEBUG_APPLY +#define HB_DEBUG_APPLY (HB_DEBUG+0) +#endif + +#define TRACE_APPLY(this) \ + hb_auto_trace_t<HB_DEBUG_APPLY, bool> trace \ + (&c->debug_depth, c->get_name (), this, HB_FUNC, \ + "idx %d codepoint %u", c->buffer->idx, c->buffer->cur().codepoint); + +struct hb_apply_context_t +{ + struct matcher_t + { + inline matcher_t (void) : + lookup_props (0), + ignore_zwnj (false), + ignore_zwj (false), + mask (-1), +#define arg1(arg) (arg) /* Remove the macro to see why it's needed! */ + syllable arg1(0), +#undef arg1 + match_func (NULL), + match_data (NULL) {}; + + typedef bool (*match_func_t) (hb_codepoint_t glyph_id, const USHORT &value, const void *data); + + inline void set_ignore_zwnj (bool ignore_zwnj_) { ignore_zwnj = ignore_zwnj_; } + inline void set_ignore_zwj (bool ignore_zwj_) { ignore_zwj = ignore_zwj_; } + inline void set_lookup_props (unsigned int lookup_props_) { lookup_props = lookup_props_; } + inline void set_mask (hb_mask_t mask_) { mask = mask_; } + inline void set_syllable (uint8_t syllable_) { syllable = syllable_; } + inline 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 + }; + + inline may_match_t may_match (const hb_glyph_info_t &info, + const USHORT *glyph_data) const + { + if (!(info.mask & mask) || + (syllable && syllable != info.syllable ())) + return MATCH_NO; + + if (match_func) + return match_func (info.codepoint, *glyph_data, match_data) ? MATCH_YES : MATCH_NO; + + return MATCH_MAYBE; + } + + enum may_skip_t { + SKIP_NO, + SKIP_YES, + SKIP_MAYBE + }; + + inline may_skip_t + may_skip (const hb_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 (&info) && + (ignore_zwnj || !_hb_glyph_info_is_zwnj (&info)) && + (ignore_zwj || !_hb_glyph_info_is_zwj (&info)) && + !_hb_glyph_info_ligated (&info))) + return SKIP_MAYBE; + + return SKIP_NO; + } + + protected: + unsigned int lookup_props; + bool ignore_zwnj; + bool ignore_zwj; + hb_mask_t mask; + uint8_t syllable; + match_func_t match_func; + const void *match_data; + }; + + struct skipping_iterator_t + { + inline void init (hb_apply_context_t *c_, bool context_match = false) + { + c = c_; + match_glyph_data = NULL, + matcher.set_match_func (NULL, NULL); + matcher.set_lookup_props (c->lookup_props); + /* Ignore ZWNJ if we are matching GSUB context, or matching GPOS. */ + matcher.set_ignore_zwnj (context_match || c->table_index == 1); + /* Ignore ZWJ if we are matching GSUB context, or matching GPOS, or if asked to. */ + matcher.set_ignore_zwj (context_match || c->table_index == 1 || c->auto_zwj); + matcher.set_mask (context_match ? -1 : c->lookup_mask); + } + inline void set_lookup_props (unsigned int lookup_props) + { + matcher.set_lookup_props (lookup_props); + } + inline void set_match_func (matcher_t::match_func_t match_func, + const void *match_data, + const USHORT glyph_data[]) + { + matcher.set_match_func (match_func, match_data); + match_glyph_data = glyph_data; + } + + inline 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); + } + + inline void reject (void) { num_items++; match_glyph_data--; } + + inline bool next (void) + { + assert (num_items > 0); + while (idx + num_items < end) + { + idx++; + const 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, match_glyph_data); + if (match == matcher_t::MATCH_YES || + (match == matcher_t::MATCH_MAYBE && + skip == matcher_t::SKIP_NO)) + { + num_items--; + match_glyph_data++; + return true; + } + + if (skip == matcher_t::SKIP_NO) + return false; + } + return false; + } + inline bool prev (void) + { + assert (num_items > 0); + while (idx >= num_items) + { + idx--; + const 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, match_glyph_data); + if (match == matcher_t::MATCH_YES || + (match == matcher_t::MATCH_MAYBE && + skip == matcher_t::SKIP_NO)) + { + num_items--; + match_glyph_data++; + return true; + } + + if (skip == matcher_t::SKIP_NO) + return false; + } + return false; + } + + unsigned int idx; + protected: + hb_apply_context_t *c; + matcher_t matcher; + const USHORT *match_glyph_data; + + unsigned int num_items; + unsigned int end; + }; + + + inline const char *get_name (void) { return "APPLY"; } + static const unsigned int max_debug_depth = HB_DEBUG_APPLY; + typedef bool return_t; + typedef return_t (*recurse_func_t) (hb_apply_context_t *c, unsigned int lookup_index); + template <typename T, typename F> + inline bool may_dispatch (const T *obj, const F *format) { return true; } + template <typename T> + inline return_t dispatch (const T &obj) { return obj.apply (this); } + static return_t default_return_value (void) { return false; } + bool stop_sublookup_iteration (return_t r) const { return r; } + return_t recurse (unsigned int lookup_index) + { + if (unlikely (nesting_level_left == 0 || !recurse_func)) + return default_return_value (); + + nesting_level_left--; + bool ret = recurse_func (this, lookup_index); + nesting_level_left++; + return ret; + } + + unsigned int table_index; /* GSUB/GPOS */ + hb_font_t *font; + hb_face_t *face; + hb_buffer_t *buffer; + hb_direction_t direction; + hb_mask_t lookup_mask; + bool auto_zwj; + recurse_func_t recurse_func; + unsigned int nesting_level_left; + unsigned int lookup_props; + const GDEF &gdef; + bool has_glyph_classes; + skipping_iterator_t iter_input, iter_context; + unsigned int debug_depth; + + + hb_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_), + direction (buffer_->props.direction), + lookup_mask (1), + auto_zwj (true), + recurse_func (NULL), + nesting_level_left (MAX_NESTING_LEVEL), + lookup_props (0), + gdef (*hb_ot_layout_from_face (face)->gdef), + has_glyph_classes (gdef.has_glyph_classes ()), + iter_input (), + iter_context (), + debug_depth (0) {} + + inline void set_lookup_mask (hb_mask_t mask) { lookup_mask = mask; } + inline void set_auto_zwj (bool auto_zwj_) { auto_zwj = auto_zwj_; } + inline void set_recurse_func (recurse_func_t func) { recurse_func = func; } + inline void set_lookup (const Lookup &l) { set_lookup_props (l.get_props ()); } + inline void set_lookup_props (unsigned int lookup_props_) + { + lookup_props = lookup_props_; + iter_input.init (this, false); + iter_context.init (this, true); + } + + inline bool + match_properties_mark (hb_codepoint_t glyph, + unsigned int glyph_props, + unsigned int lookup_props) const + { + /* If using mark filtering sets, the high short of + * lookup_props has the set index. + */ + if (lookup_props & LookupFlag::UseMarkFilteringSet) + return gdef.mark_set_covers (lookup_props >> 16, glyph); + + /* The second byte of lookup_props has the meaning + * "ignore marks of attachment type different than + * the attachment type specified." + */ + if (lookup_props & LookupFlag::MarkAttachmentType) + return (lookup_props & LookupFlag::MarkAttachmentType) == (glyph_props & LookupFlag::MarkAttachmentType); + + return true; + } + + inline bool + check_glyph_property (const hb_glyph_info_t *info, + unsigned int lookup_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 + * lookup_props includes LookupFlags::IgnoreLigatures + */ + if (glyph_props & lookup_props & LookupFlag::IgnoreFlags) + return false; + + if (unlikely (glyph_props & HB_OT_LAYOUT_GLYPH_PROPS_MARK)) + return match_properties_mark (glyph, glyph_props, lookup_props); + + return true; + } + + inline void _set_glyph_props (hb_codepoint_t glyph_index, + unsigned int class_guess = 0, + bool ligature = false, + bool component = false) const + { + unsigned int add_in = _hb_glyph_info_get_glyph_props (&buffer->cur()) & + HB_OT_LAYOUT_GLYPH_PROPS_PRESERVE; + add_in |= HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED; + if (ligature) + { + add_in |= 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 substitions. Ie. if you ligate, expand, + * and ligate again, it forgives the multiplication and acts as + * if only ligation happened. As such, clear MULTIPLIED bit. + */ + add_in &= ~HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED; + } + if (component) + add_in |= HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED; + if (likely (has_glyph_classes)) + _hb_glyph_info_set_glyph_props (&buffer->cur(), add_in | gdef.get_glyph_props (glyph_index)); + else if (class_guess) + _hb_glyph_info_set_glyph_props (&buffer->cur(), add_in | class_guess); + } + + inline void replace_glyph (hb_codepoint_t glyph_index) const + { + _set_glyph_props (glyph_index); + buffer->replace_glyph (glyph_index); + } + inline void replace_glyph_inplace (hb_codepoint_t glyph_index) const + { + _set_glyph_props (glyph_index); + buffer->cur().codepoint = glyph_index; + } + inline void replace_glyph_with_ligature (hb_codepoint_t glyph_index, + unsigned int class_guess) const + { + _set_glyph_props (glyph_index, class_guess, true); + buffer->replace_glyph (glyph_index); + } + inline void output_glyph_for_component (hb_codepoint_t glyph_index, + unsigned int class_guess) const + { + _set_glyph_props (glyph_index, class_guess, false, true); + buffer->output_glyph (glyph_index); + } +}; + + + +typedef bool (*intersects_func_t) (hb_set_t *glyphs, const USHORT &value, const void *data); +typedef void (*collect_glyphs_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); + +struct ContextClosureFuncs +{ + intersects_func_t intersects; +}; +struct ContextCollectGlyphsFuncs +{ + collect_glyphs_func_t collect; +}; +struct ContextApplyFuncs +{ + match_func_t match; +}; + + +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<const ClassDef *>(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> &coverage = (const OffsetTo<Coverage>&)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 void collect_glyph (hb_set_t *glyphs, const USHORT &value, const void *data HB_UNUSED) +{ + glyphs->add (value); +} +static inline void collect_class (hb_set_t *glyphs, const USHORT &value, const void *data) +{ + const ClassDef &class_def = *reinterpret_cast<const ClassDef *>(data); + class_def.add_class (glyphs, value); +} +static inline void collect_coverage (hb_set_t *glyphs, const USHORT &value, const void *data) +{ + const OffsetTo<Coverage> &coverage = (const OffsetTo<Coverage>&)value; + (data+coverage).add_coverage (glyphs); +} +static inline void collect_array (hb_collect_glyphs_context_t *c HB_UNUSED, + hb_set_t *glyphs, + unsigned int count, + const USHORT values[], + collect_glyphs_func_t collect_func, + const void *collect_data) +{ + for (unsigned int i = 0; i < count; i++) + collect_func (glyphs, values[i], collect_data); +} + + +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<const ClassDef *>(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> &coverage = (const OffsetTo<Coverage>&)value; + return (data+coverage).get_coverage (glyph_id) != NOT_COVERED; +} + +static inline bool would_match_input (hb_would_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) +{ + if (count != c->len) + return false; + + for (unsigned int i = 1; i < count; i++) + if (likely (!match_func (c->glyphs[i], input[i - 1], match_data))) + return false; + + return true; +} +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, + unsigned int match_positions[MAX_CONTEXT_LENGTH], + bool *p_is_mark_ligature = NULL, + unsigned int *p_total_component_count = NULL) +{ + TRACE_APPLY (NULL); + + if (unlikely (count > MAX_CONTEXT_LENGTH)) TRACE_RETURN (false); + + hb_buffer_t *buffer = c->buffer; + + hb_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, 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.o + * There is an exception to this: 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...) + */ + + bool is_mark_ligature = _hb_glyph_info_is_mark (&buffer->cur()); + + 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()); + + match_positions[0] = buffer->idx; + for (unsigned int i = 1; i < count; i++) + { + if (!skippy_iter.next ()) return TRACE_RETURN (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) + return TRACE_RETURN (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_RETURN (false); + } + + is_mark_ligature = is_mark_ligature && _hb_glyph_info_is_mark (&buffer->info[skippy_iter.idx]); + total_component_count += _hb_glyph_info_get_lig_num_comps (&buffer->info[skippy_iter.idx]); + } + + *end_offset = skippy_iter.idx - buffer->idx + 1; + + if (p_is_mark_ligature) + *p_is_mark_ligature = is_mark_ligature; + + if (p_total_component_count) + *p_total_component_count = total_component_count; + + return TRACE_RETURN (true); +} +static inline void ligate_input (hb_apply_context_t *c, + unsigned int count, /* Including the first glyph */ + unsigned int match_positions[MAX_CONTEXT_LENGTH], /* Including the first glyph */ + unsigned int match_length, + hb_codepoint_t lig_glyph, + bool is_mark_ligature, + unsigned int total_component_count) +{ + TRACE_APPLY (NULL); + + hb_buffer_t *buffer = c->buffer; + + buffer->merge_clusters (buffer->idx, buffer->idx + match_length); + + /* + * - 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 wit 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 + */ + + unsigned int klass = is_mark_ligature ? 0 : HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE; + unsigned int lig_id = is_mark_ligature ? 0 : _hb_allocate_lig_id (buffer); + 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_mark_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); + _hb_glyph_info_set_modified_combining_class (&buffer->cur(), 0); + } + } + c->replace_glyph_with_ligature (lig_glyph, klass); + + for (unsigned int i = 1; i < count; i++) + { + while (buffer->idx < match_positions[i]) + { + if (!is_mark_ligature) { + unsigned int new_lig_comp = components_so_far - last_num_components + + MIN (MAX (_hb_glyph_info_get_lig_comp (&buffer->cur()), 1u), last_num_components); + _hb_glyph_info_set_lig_props_for_mark (&buffer->cur(), lig_id, new_lig_comp); + } + 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 int i = buffer->idx; i < buffer->len; i++) { + if (last_lig_id == _hb_glyph_info_get_lig_id (&buffer->info[i])) { + unsigned int new_lig_comp = components_so_far - last_num_components + + MIN (MAX (_hb_glyph_info_get_lig_comp (&buffer->info[i]), 1u), last_num_components); + _hb_glyph_info_set_lig_props_for_mark (&buffer->info[i], lig_id, new_lig_comp); + } else + break; + } + } + TRACE_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) +{ + TRACE_APPLY (NULL); + + hb_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, backtrack); + + for (unsigned int i = 0; i < count; i++) + if (!skippy_iter.prev ()) + return TRACE_RETURN (false); + + return TRACE_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) +{ + TRACE_APPLY (NULL); + + hb_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_context; + skippy_iter.reset (c->buffer->idx + offset - 1, count); + skippy_iter.set_match_func (match_func, match_data, lookahead); + + for (unsigned int i = 0; i < count; i++) + if (!skippy_iter.next ()) + return TRACE_RETURN (false); + + return TRACE_RETURN (true); +} + + + +struct LookupRecord +{ + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + 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); +}; + + +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 bool apply_lookup (hb_apply_context_t *c, + unsigned int count, /* Including the first glyph */ + unsigned int match_positions[MAX_CONTEXT_LENGTH], /* Including the first glyph */ + unsigned int lookupCount, + const LookupRecord lookupRecord[], /* Array of LookupRecords--in design order */ + unsigned int match_length) +{ + TRACE_APPLY (NULL); + + hb_buffer_t *buffer = c->buffer; + unsigned int end; + + /* All positions are distance from beginning of *output* buffer. + * Adjust. */ + { + unsigned int bl = buffer->backtrack_len (); + end = bl + match_length; + + 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; i++) + { + unsigned int idx = lookupRecord[i].sequenceIndex; + if (idx >= count) + continue; + + buffer->move_to (match_positions[idx]); + + unsigned int orig_len = buffer->backtrack_len () + buffer->lookahead_len (); + 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. */ + + /* end can't go back past the current match position. + * Note: this is only true because we do NOT allow MultipleSubst + * with zero sequence len. */ + end = MAX ((int) match_positions[idx] + 1, int (end) + delta); + + unsigned int next = idx + 1; /* next now is the position after the recursed lookup. */ + + if (delta > 0) + { + if (unlikely (delta + count > MAX_CONTEXT_LENGTH)) + break; + } + else + { + /* NOTE: delta is negative. */ + delta = 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; + } + + buffer->move_to (end); + + return TRACE_RETURN (true); +} + + + +/* Contextual lookups */ + +struct ContextClosureLookupContext +{ + ContextClosureFuncs funcs; + const void *intersects_data; +}; + +struct ContextCollectGlyphsLookupContext +{ + ContextCollectGlyphsFuncs funcs; + const void *collect_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)) + recurse_lookups (c, + lookupCount, lookupRecord); +} + +static inline void context_collect_glyphs_lookup (hb_collect_glyphs_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[], + 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); +} + +static inline bool context_would_apply_lookup (hb_would_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 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); +} +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) +{ + unsigned int match_length = 0; + unsigned int match_positions[MAX_CONTEXT_LENGTH]; + return match_input (c, + inputCount, input, + lookup_context.funcs.match, lookup_context.match_data, + &match_length, match_positions) + && apply_lookup (c, + inputCount, match_positions, + lookupCount, lookupRecord, + match_length); +} + +struct Rule +{ + inline void closure (hb_closure_context_t *c, ContextClosureLookupContext &lookup_context) const + { + TRACE_CLOSURE (this); + const LookupRecord *lookupRecord = &StructAtOffset<LookupRecord> (inputZ, inputZ[0].static_size * (inputCount ? inputCount - 1 : 0)); + context_closure_lookup (c, + inputCount, inputZ, + lookupCount, lookupRecord, + lookup_context); + } + + inline void collect_glyphs (hb_collect_glyphs_context_t *c, ContextCollectGlyphsLookupContext &lookup_context) const + { + TRACE_COLLECT_GLYPHS (this); + const LookupRecord *lookupRecord = &StructAtOffset<LookupRecord> (inputZ, inputZ[0].static_size * (inputCount ? inputCount - 1 : 0)); + context_collect_glyphs_lookup (c, + inputCount, inputZ, + lookupCount, lookupRecord, + lookup_context); + } + + inline bool would_apply (hb_would_apply_context_t *c, ContextApplyLookupContext &lookup_context) const + { + TRACE_WOULD_APPLY (this); + const LookupRecord *lookupRecord = &StructAtOffset<LookupRecord> (inputZ, inputZ[0].static_size * (inputCount ? inputCount - 1 : 0)); + return TRACE_RETURN (context_would_apply_lookup (c, inputCount, inputZ, lookupCount, lookupRecord, lookup_context)); + } + + inline bool apply (hb_apply_context_t *c, ContextApplyLookupContext &lookup_context) const + { + TRACE_APPLY (this); + const LookupRecord *lookupRecord = &StructAtOffset<LookupRecord> (inputZ, inputZ[0].static_size * (inputCount ? inputCount - 1 : 0)); + return TRACE_RETURN (context_apply_lookup (c, inputCount, inputZ, lookupCount, lookupRecord, lookup_context)); + } + + public: + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return inputCount.sanitize (c) + && lookupCount.sanitize (c) + && c->check_range (inputZ, + inputZ[0].static_size * inputCount + + lookupRecordX[0].static_size * lookupCount); + } + + protected: + USHORT inputCount; /* Total number of glyphs in input + * glyph sequence--includes the first + * glyph */ + USHORT lookupCount; /* Number of LookupRecords */ + USHORT inputZ[VAR]; /* Array of match inputs--start with + * second glyph */ + LookupRecord lookupRecordX[VAR]; /* Array of LookupRecords--in + * design order */ + public: + DEFINE_SIZE_ARRAY2 (4, inputZ, lookupRecordX); +}; + +struct RuleSet +{ + inline void closure (hb_closure_context_t *c, ContextClosureLookupContext &lookup_context) const + { + TRACE_CLOSURE (this); + unsigned int num_rules = rule.len; + for (unsigned int i = 0; i < num_rules; i++) + (this+rule[i]).closure (c, lookup_context); + } + + inline void collect_glyphs (hb_collect_glyphs_context_t *c, ContextCollectGlyphsLookupContext &lookup_context) const + { + TRACE_COLLECT_GLYPHS (this); + unsigned int num_rules = rule.len; + for (unsigned int i = 0; i < num_rules; i++) + (this+rule[i]).collect_glyphs (c, lookup_context); + } + + inline bool would_apply (hb_would_apply_context_t *c, ContextApplyLookupContext &lookup_context) const + { + TRACE_WOULD_APPLY (this); + unsigned int num_rules = rule.len; + for (unsigned int i = 0; i < num_rules; i++) + { + if ((this+rule[i]).would_apply (c, lookup_context)) + return TRACE_RETURN (true); + } + return TRACE_RETURN (false); + } + + inline bool apply (hb_apply_context_t *c, ContextApplyLookupContext &lookup_context) const + { + TRACE_APPLY (this); + 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) const + { + TRACE_SANITIZE (this); + return TRACE_RETURN (rule.sanitize (c, this)); + } + + protected: + OffsetArrayOf<Rule> + rule; /* Array of Rule tables + * ordered by preference */ + public: + DEFINE_SIZE_ARRAY (2, rule); +}; + + +struct ContextFormat1 +{ + inline void closure (hb_closure_context_t *c) const + { + TRACE_CLOSURE (this); + + const Coverage &cov = (this+coverage); + + struct ContextClosureLookupContext lookup_context = { + {intersects_glyph}, + 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 void collect_glyphs (hb_collect_glyphs_context_t *c) const + { + TRACE_COLLECT_GLYPHS (this); + (this+coverage).add_coverage (c->input); + + struct ContextCollectGlyphsLookupContext lookup_context = { + {collect_glyph}, + NULL + }; + + unsigned int count = ruleSet.len; + for (unsigned int i = 0; i < count; i++) + (this+ruleSet[i]).collect_glyphs (c, lookup_context); + } + + inline bool would_apply (hb_would_apply_context_t *c) const + { + TRACE_WOULD_APPLY (this); + + const RuleSet &rule_set = this+ruleSet[(this+coverage).get_coverage (c->glyphs[0])]; + struct ContextApplyLookupContext lookup_context = { + {match_glyph}, + NULL + }; + return TRACE_RETURN (rule_set.would_apply (c, lookup_context)); + } + + inline const Coverage &get_coverage (void) const + { + return this+coverage; + } + + inline bool apply (hb_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_RETURN (false); + + const RuleSet &rule_set = this+ruleSet[index]; + struct ContextApplyLookupContext lookup_context = { + {match_glyph}, + NULL + }; + return TRACE_RETURN (rule_set.apply (c, lookup_context)); + } + + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return TRACE_RETURN (coverage.sanitize (c, this) && ruleSet.sanitize (c, this)); + } + + protected: + USHORT format; /* Format identifier--format = 1 */ + OffsetTo<Coverage> + coverage; /* Offset to Coverage table--from + * beginning of table */ + OffsetArrayOf<RuleSet> + ruleSet; /* Array of RuleSet tables + * ordered by Coverage Index */ + public: + DEFINE_SIZE_ARRAY (6, ruleSet); +}; + + +struct ContextFormat2 +{ + inline void closure (hb_closure_context_t *c) const + { + TRACE_CLOSURE (this); + if (!(this+coverage).intersects (c->glyphs)) + return; + + const ClassDef &class_def = this+classDef; + + struct ContextClosureLookupContext lookup_context = { + {intersects_class}, + &class_def + }; + + 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 void collect_glyphs (hb_collect_glyphs_context_t *c) const + { + TRACE_COLLECT_GLYPHS (this); + (this+coverage).add_coverage (c->input); + + const ClassDef &class_def = this+classDef; + struct ContextCollectGlyphsLookupContext lookup_context = { + {collect_class}, + &class_def + }; + + unsigned int count = ruleSet.len; + for (unsigned int i = 0; i < count; i++) + (this+ruleSet[i]).collect_glyphs (c, lookup_context); + } + + inline bool would_apply (hb_would_apply_context_t *c) const + { + TRACE_WOULD_APPLY (this); + + 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 TRACE_RETURN (rule_set.would_apply (c, lookup_context)); + } + + inline const Coverage &get_coverage (void) const + { + return this+coverage; + } + + inline bool apply (hb_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_RETURN (false); + + const ClassDef &class_def = this+classDef; + index = class_def.get_class (c->buffer->cur().codepoint); + const RuleSet &rule_set = this+ruleSet[index]; + struct ContextApplyLookupContext lookup_context = { + {match_class}, + &class_def + }; + return TRACE_RETURN (rule_set.apply (c, lookup_context)); + } + + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return TRACE_RETURN (coverage.sanitize (c, this) && classDef.sanitize (c, this) && ruleSet.sanitize (c, this)); + } + + protected: + USHORT format; /* Format identifier--format = 2 */ + OffsetTo<Coverage> + coverage; /* Offset to Coverage table--from + * beginning of table */ + OffsetTo<ClassDef> + classDef; /* Offset to glyph ClassDef table--from + * beginning of table */ + OffsetArrayOf<RuleSet> + ruleSet; /* Array of RuleSet tables + * ordered by class */ + public: + DEFINE_SIZE_ARRAY (8, ruleSet); +}; + + +struct ContextFormat3 +{ + inline void closure (hb_closure_context_t *c) const + { + TRACE_CLOSURE (this); + if (!(this+coverageZ[0]).intersects (c->glyphs)) + return; + + const LookupRecord *lookupRecord = &StructAtOffset<LookupRecord> (coverageZ, coverageZ[0].static_size * glyphCount); + struct ContextClosureLookupContext lookup_context = { + {intersects_coverage}, + this + }; + context_closure_lookup (c, + glyphCount, (const USHORT *) (coverageZ + 1), + lookupCount, lookupRecord, + lookup_context); + } + + inline void collect_glyphs (hb_collect_glyphs_context_t *c) const + { + TRACE_COLLECT_GLYPHS (this); + (this+coverageZ[0]).add_coverage (c->input); + + const LookupRecord *lookupRecord = &StructAtOffset<LookupRecord> (coverageZ, coverageZ[0].static_size * glyphCount); + struct ContextCollectGlyphsLookupContext lookup_context = { + {collect_coverage}, + this + }; + + context_collect_glyphs_lookup (c, + glyphCount, (const USHORT *) (coverageZ + 1), + lookupCount, lookupRecord, + lookup_context); + } + + inline bool would_apply (hb_would_apply_context_t *c) const + { + TRACE_WOULD_APPLY (this); + + const LookupRecord *lookupRecord = &StructAtOffset<LookupRecord> (coverageZ, coverageZ[0].static_size * glyphCount); + struct ContextApplyLookupContext lookup_context = { + {match_coverage}, + this + }; + return TRACE_RETURN (context_would_apply_lookup (c, glyphCount, (const USHORT *) (coverageZ + 1), lookupCount, lookupRecord, lookup_context)); + } + + inline const Coverage &get_coverage (void) const + { + return this+coverageZ[0]; + } + + inline bool apply (hb_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_RETURN (false); + + const LookupRecord *lookupRecord = &StructAtOffset<LookupRecord> (coverageZ, coverageZ[0].static_size * glyphCount); + struct ContextApplyLookupContext lookup_context = { + {match_coverage}, + this + }; + return TRACE_RETURN (context_apply_lookup (c, glyphCount, (const USHORT *) (coverageZ + 1), lookupCount, lookupRecord, lookup_context)); + } + + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + if (!c->check_struct (this)) return TRACE_RETURN (false); + unsigned int count = glyphCount; + if (!count) return TRACE_RETURN (false); /* We want to access coverageZ[0] freely. */ + if (!c->check_array (coverageZ, coverageZ[0].static_size, count)) return TRACE_RETURN (false); + for (unsigned int i = 0; i < count; i++) + if (!coverageZ[i].sanitize (c, this)) return TRACE_RETURN (false); + const LookupRecord *lookupRecord = &StructAtOffset<LookupRecord> (coverageZ, coverageZ[0].static_size * count); + return TRACE_RETURN (c->check_array (lookupRecord, lookupRecord[0].static_size, lookupCount)); + } + + protected: + USHORT format; /* Format identifier--format = 3 */ + USHORT glyphCount; /* Number of glyphs in the input glyph + * sequence */ + USHORT lookupCount; /* Number of LookupRecords */ + OffsetTo<Coverage> + coverageZ[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, coverageZ, lookupRecordX); +}; + +struct Context +{ + template <typename context_t> + inline typename context_t::return_t dispatch (context_t *c) const + { + TRACE_DISPATCH (this, u.format); + if (unlikely (!c->may_dispatch (this, &u.format))) TRACE_RETURN (c->default_return_value ()); + switch (u.format) { + case 1: return TRACE_RETURN (c->dispatch (u.format1)); + case 2: return TRACE_RETURN (c->dispatch (u.format2)); + case 3: return TRACE_RETURN (c->dispatch (u.format3)); + default:return TRACE_RETURN (c->default_return_value ()); + } + } + + protected: + 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 ChainContextCollectGlyphsLookupContext +{ + ContextCollectGlyphsFuncs funcs; + const void *collect_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])) + recurse_lookups (c, + lookupCount, lookupRecord); +} + +static inline void chain_context_collect_glyphs_lookup (hb_collect_glyphs_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[], + 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); +} + +static inline bool chain_context_would_apply_lookup (hb_would_apply_context_t *c, + unsigned int backtrackCount, + const USHORT backtrack[] HB_UNUSED, + 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[] 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, lookup_context.match_data[1]); +} + +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 match_length = 0; + unsigned int match_positions[MAX_CONTEXT_LENGTH]; + return match_input (c, + inputCount, input, + lookup_context.funcs.match, lookup_context.match_data[1], + &match_length, match_positions) + && match_backtrack (c, + backtrackCount, backtrack, + lookup_context.funcs.match, lookup_context.match_data[0]) + && match_lookahead (c, + lookaheadCount, lookahead, + lookup_context.funcs.match, lookup_context.match_data[2], + match_length) + && apply_lookup (c, + inputCount, match_positions, + lookupCount, lookupRecord, + match_length); +} + +struct ChainRule +{ + inline void closure (hb_closure_context_t *c, ChainContextClosureLookupContext &lookup_context) const + { + TRACE_CLOSURE (this); + const HeadlessArrayOf<USHORT> &input = StructAfter<HeadlessArrayOf<USHORT> > (backtrack); + const ArrayOf<USHORT> &lookahead = StructAfter<ArrayOf<USHORT> > (input); + const ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (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 void collect_glyphs (hb_collect_glyphs_context_t *c, ChainContextCollectGlyphsLookupContext &lookup_context) const + { + TRACE_COLLECT_GLYPHS (this); + const HeadlessArrayOf<USHORT> &input = StructAfter<HeadlessArrayOf<USHORT> > (backtrack); + const ArrayOf<USHORT> &lookahead = StructAfter<ArrayOf<USHORT> > (input); + const ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (lookahead); + chain_context_collect_glyphs_lookup (c, + backtrack.len, backtrack.array, + input.len, input.array, + lookahead.len, lookahead.array, + lookup.len, lookup.array, + lookup_context); + } + + inline bool would_apply (hb_would_apply_context_t *c, ChainContextApplyLookupContext &lookup_context) const + { + TRACE_WOULD_APPLY (this); + const HeadlessArrayOf<USHORT> &input = StructAfter<HeadlessArrayOf<USHORT> > (backtrack); + const ArrayOf<USHORT> &lookahead = StructAfter<ArrayOf<USHORT> > (input); + const ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (lookahead); + return TRACE_RETURN (chain_context_would_apply_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 (this); + const HeadlessArrayOf<USHORT> &input = StructAfter<HeadlessArrayOf<USHORT> > (backtrack); + const ArrayOf<USHORT> &lookahead = StructAfter<ArrayOf<USHORT> > (input); + const ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (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)); + } + + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + if (!backtrack.sanitize (c)) return TRACE_RETURN (false); + const HeadlessArrayOf<USHORT> &input = StructAfter<HeadlessArrayOf<USHORT> > (backtrack); + if (!input.sanitize (c)) return TRACE_RETURN (false); + const ArrayOf<USHORT> &lookahead = StructAfter<ArrayOf<USHORT> > (input); + if (!lookahead.sanitize (c)) return TRACE_RETURN (false); + const ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (lookahead); + return TRACE_RETURN (lookup.sanitize (c)); + } + + protected: + ArrayOf<USHORT> + backtrack; /* Array of backtracking values + * (to be matched before the input + * sequence) */ + HeadlessArrayOf<USHORT> + inputX; /* Array of input values (start with + * second glyph) */ + ArrayOf<USHORT> + lookaheadX; /* Array of lookahead values's (to be + * matched after the input sequence) */ + ArrayOf<LookupRecord> + 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 (this); + unsigned int num_rules = rule.len; + for (unsigned int i = 0; i < num_rules; i++) + (this+rule[i]).closure (c, lookup_context); + } + + inline void collect_glyphs (hb_collect_glyphs_context_t *c, ChainContextCollectGlyphsLookupContext &lookup_context) const + { + TRACE_COLLECT_GLYPHS (this); + unsigned int num_rules = rule.len; + for (unsigned int i = 0; i < num_rules; i++) + (this+rule[i]).collect_glyphs (c, lookup_context); + } + + inline bool would_apply (hb_would_apply_context_t *c, ChainContextApplyLookupContext &lookup_context) const + { + TRACE_WOULD_APPLY (this); + unsigned int num_rules = rule.len; + for (unsigned int i = 0; i < num_rules; i++) + if ((this+rule[i]).would_apply (c, lookup_context)) + return TRACE_RETURN (true); + + return TRACE_RETURN (false); + } + + inline bool apply (hb_apply_context_t *c, ChainContextApplyLookupContext &lookup_context) const + { + TRACE_APPLY (this); + 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) const + { + TRACE_SANITIZE (this); + return TRACE_RETURN (rule.sanitize (c, this)); + } + + protected: + OffsetArrayOf<ChainRule> + rule; /* Array of ChainRule tables + * ordered by preference */ + public: + DEFINE_SIZE_ARRAY (2, rule); +}; + +struct ChainContextFormat1 +{ + inline void closure (hb_closure_context_t *c) const + { + TRACE_CLOSURE (this); + const Coverage &cov = (this+coverage); + + struct ChainContextClosureLookupContext lookup_context = { + {intersects_glyph}, + {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 void collect_glyphs (hb_collect_glyphs_context_t *c) const + { + TRACE_COLLECT_GLYPHS (this); + (this+coverage).add_coverage (c->input); + + struct ChainContextCollectGlyphsLookupContext lookup_context = { + {collect_glyph}, + {NULL, NULL, NULL} + }; + + unsigned int count = ruleSet.len; + for (unsigned int i = 0; i < count; i++) + (this+ruleSet[i]).collect_glyphs (c, lookup_context); + } + + inline bool would_apply (hb_would_apply_context_t *c) const + { + TRACE_WOULD_APPLY (this); + + const ChainRuleSet &rule_set = this+ruleSet[(this+coverage).get_coverage (c->glyphs[0])]; + struct ChainContextApplyLookupContext lookup_context = { + {match_glyph}, + {NULL, NULL, NULL} + }; + return TRACE_RETURN (rule_set.would_apply (c, lookup_context)); + } + + inline const Coverage &get_coverage (void) const + { + return this+coverage; + } + + inline bool apply (hb_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_RETURN (false); + + const ChainRuleSet &rule_set = this+ruleSet[index]; + struct ChainContextApplyLookupContext lookup_context = { + {match_glyph}, + {NULL, NULL, NULL} + }; + return TRACE_RETURN (rule_set.apply (c, lookup_context)); + } + + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return TRACE_RETURN (coverage.sanitize (c, this) && ruleSet.sanitize (c, this)); + } + + protected: + USHORT format; /* Format identifier--format = 1 */ + OffsetTo<Coverage> + coverage; /* Offset to Coverage table--from + * beginning of table */ + OffsetArrayOf<ChainRuleSet> + ruleSet; /* Array of ChainRuleSet tables + * ordered by Coverage Index */ + public: + DEFINE_SIZE_ARRAY (6, ruleSet); +}; + +struct ChainContextFormat2 +{ + inline void closure (hb_closure_context_t *c) const + { + TRACE_CLOSURE (this); + 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}, + {&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 void collect_glyphs (hb_collect_glyphs_context_t *c) const + { + TRACE_COLLECT_GLYPHS (this); + (this+coverage).add_coverage (c->input); + + const ClassDef &backtrack_class_def = this+backtrackClassDef; + const ClassDef &input_class_def = this+inputClassDef; + const ClassDef &lookahead_class_def = this+lookaheadClassDef; + + struct ChainContextCollectGlyphsLookupContext lookup_context = { + {collect_class}, + {&backtrack_class_def, + &input_class_def, + &lookahead_class_def} + }; + + unsigned int count = ruleSet.len; + for (unsigned int i = 0; i < count; i++) + (this+ruleSet[i]).collect_glyphs (c, lookup_context); + } + + inline bool would_apply (hb_would_apply_context_t *c) const + { + TRACE_WOULD_APPLY (this); + + const ClassDef &backtrack_class_def = this+backtrackClassDef; + const ClassDef &input_class_def = this+inputClassDef; + const ClassDef &lookahead_class_def = this+lookaheadClassDef; + + unsigned int index = input_class_def.get_class (c->glyphs[0]); + const ChainRuleSet &rule_set = this+ruleSet[index]; + struct ChainContextApplyLookupContext lookup_context = { + {match_class}, + {&backtrack_class_def, + &input_class_def, + &lookahead_class_def} + }; + return TRACE_RETURN (rule_set.would_apply (c, lookup_context)); + } + + inline const Coverage &get_coverage (void) const + { + return this+coverage; + } + + inline bool apply (hb_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_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.get_class (c->buffer->cur().codepoint); + const ChainRuleSet &rule_set = this+ruleSet[index]; + struct ChainContextApplyLookupContext lookup_context = { + {match_class}, + {&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) const + { + TRACE_SANITIZE (this); + return TRACE_RETURN (coverage.sanitize (c, this) && backtrackClassDef.sanitize (c, this) && + inputClassDef.sanitize (c, this) && lookaheadClassDef.sanitize (c, this) && + ruleSet.sanitize (c, this)); + } + + protected: + USHORT format; /* Format identifier--format = 2 */ + OffsetTo<Coverage> + coverage; /* Offset to Coverage table--from + * beginning of table */ + OffsetTo<ClassDef> + backtrackClassDef; /* Offset to glyph ClassDef table + * containing backtrack sequence + * data--from beginning of table */ + OffsetTo<ClassDef> + inputClassDef; /* Offset to glyph ClassDef + * table containing input sequence + * data--from beginning of table */ + OffsetTo<ClassDef> + lookaheadClassDef; /* Offset to glyph ClassDef table + * containing lookahead sequence + * data--from beginning of table */ + OffsetArrayOf<ChainRuleSet> + ruleSet; /* Array of ChainRuleSet tables + * ordered by class */ + public: + DEFINE_SIZE_ARRAY (12, ruleSet); +}; + +struct ChainContextFormat3 +{ + inline void closure (hb_closure_context_t *c) const + { + TRACE_CLOSURE (this); + const OffsetArrayOf<Coverage> &input = StructAfter<OffsetArrayOf<Coverage> > (backtrack); + + if (!(this+input[0]).intersects (c->glyphs)) + return; + + const OffsetArrayOf<Coverage> &lookahead = StructAfter<OffsetArrayOf<Coverage> > (input); + const ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (lookahead); + struct ChainContextClosureLookupContext lookup_context = { + {intersects_coverage}, + {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 void collect_glyphs (hb_collect_glyphs_context_t *c) const + { + TRACE_COLLECT_GLYPHS (this); + const OffsetArrayOf<Coverage> &input = StructAfter<OffsetArrayOf<Coverage> > (backtrack); + + (this+input[0]).add_coverage (c->input); + + const OffsetArrayOf<Coverage> &lookahead = StructAfter<OffsetArrayOf<Coverage> > (input); + const ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (lookahead); + struct ChainContextCollectGlyphsLookupContext lookup_context = { + {collect_coverage}, + {this, this, this} + }; + chain_context_collect_glyphs_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 would_apply (hb_would_apply_context_t *c) const + { + TRACE_WOULD_APPLY (this); + + const OffsetArrayOf<Coverage> &input = StructAfter<OffsetArrayOf<Coverage> > (backtrack); + const OffsetArrayOf<Coverage> &lookahead = StructAfter<OffsetArrayOf<Coverage> > (input); + const ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (lookahead); + struct ChainContextApplyLookupContext lookup_context = { + {match_coverage}, + {this, this, this} + }; + return TRACE_RETURN (chain_context_would_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 const Coverage &get_coverage (void) const + { + const OffsetArrayOf<Coverage> &input = StructAfter<OffsetArrayOf<Coverage> > (backtrack); + return this+input[0]; + } + + inline bool apply (hb_apply_context_t *c) const + { + TRACE_APPLY (this); + const OffsetArrayOf<Coverage> &input = StructAfter<OffsetArrayOf<Coverage> > (backtrack); + + unsigned int index = (this+input[0]).get_coverage (c->buffer->cur().codepoint); + if (likely (index == NOT_COVERED)) return TRACE_RETURN (false); + + const OffsetArrayOf<Coverage> &lookahead = StructAfter<OffsetArrayOf<Coverage> > (input); + const ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (lookahead); + struct ChainContextApplyLookupContext lookup_context = { + {match_coverage}, + {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) const + { + TRACE_SANITIZE (this); + if (!backtrack.sanitize (c, this)) return TRACE_RETURN (false); + const OffsetArrayOf<Coverage> &input = StructAfter<OffsetArrayOf<Coverage> > (backtrack); + if (!input.sanitize (c, this)) return TRACE_RETURN (false); + if (!input.len) return TRACE_RETURN (false); /* To be consistent with Context. */ + const OffsetArrayOf<Coverage> &lookahead = StructAfter<OffsetArrayOf<Coverage> > (input); + if (!lookahead.sanitize (c, this)) return TRACE_RETURN (false); + const ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (lookahead); + return TRACE_RETURN (lookup.sanitize (c)); + } + + protected: + USHORT format; /* Format identifier--format = 3 */ + OffsetArrayOf<Coverage> + backtrack; /* Array of coverage tables + * in backtracking sequence, in glyph + * sequence order */ + OffsetArrayOf<Coverage> + inputX ; /* Array of coverage + * tables in input sequence, in glyph + * sequence order */ + OffsetArrayOf<Coverage> + lookaheadX; /* Array of coverage tables + * in lookahead sequence, in glyph + * sequence order */ + ArrayOf<LookupRecord> + lookupX; /* Array of LookupRecords--in + * design order) */ + public: + DEFINE_SIZE_MIN (10); +}; + +struct ChainContext +{ + template <typename context_t> + inline typename context_t::return_t dispatch (context_t *c) const + { + TRACE_DISPATCH (this, u.format); + if (unlikely (!c->may_dispatch (this, &u.format))) TRACE_RETURN (c->default_return_value ()); + switch (u.format) { + case 1: return TRACE_RETURN (c->dispatch (u.format1)); + case 2: return TRACE_RETURN (c->dispatch (u.format2)); + case 3: return TRACE_RETURN (c->dispatch (u.format3)); + default:return TRACE_RETURN (c->default_return_value ()); + } + } + + protected: + union { + USHORT format; /* Format identifier */ + ChainContextFormat1 format1; + ChainContextFormat2 format2; + ChainContextFormat3 format3; + } u; +}; + + +template <typename T> +struct ExtensionFormat1 +{ + inline unsigned int get_type (void) const { return extensionLookupType; } + + template <typename X> + inline const X& get_subtable (void) const + { + unsigned int offset = extensionOffset; + if (unlikely (!offset)) return Null(typename T::LookupSubTable); + return StructAtOffset<typename T::LookupSubTable> (this, offset); + } + + template <typename context_t> + inline typename context_t::return_t dispatch (context_t *c) const + { + TRACE_DISPATCH (this, format); + if (unlikely (!c->may_dispatch (this, this))) TRACE_RETURN (c->default_return_value ()); + return get_subtable<typename T::LookupSubTable> ().dispatch (c, get_type ()); + } + + /* This is called from may_dispatch() above with hb_sanitize_context_t. */ + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return TRACE_RETURN (c->check_struct (this) && extensionOffset != 0); + } + + protected: + 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); +}; + +template <typename T> +struct Extension +{ + inline unsigned int get_type (void) const + { + switch (u.format) { + case 1: return u.format1.get_type (); + default:return 0; + } + } + template <typename X> + inline const X& get_subtable (void) const + { + switch (u.format) { + case 1: return u.format1.template get_subtable<typename T::LookupSubTable> (); + default:return Null(typename T::LookupSubTable); + } + } + + template <typename context_t> + inline typename context_t::return_t dispatch (context_t *c) const + { + TRACE_DISPATCH (this, u.format); + if (unlikely (!c->may_dispatch (this, &u.format))) TRACE_RETURN (c->default_return_value ()); + switch (u.format) { + case 1: return TRACE_RETURN (u.format1.dispatch (c)); + default:return TRACE_RETURN (c->default_return_value ()); + } + } + + protected: + union { + USHORT format; /* Format identifier */ + ExtensionFormat1<T> 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 hb_tag_t get_feature_tag (unsigned int i) const + { return i == Index::NOT_FOUND_INDEX ? HB_TAG_NONE : (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) const + { + TRACE_SANITIZE (this); + 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 0x00010000u */ + OffsetTo<ScriptList> + scriptList; /* ScriptList table */ + OffsetTo<FeatureList> + featureList; /* FeatureList table */ + OffsetTo<LookupList> + lookupList; /* LookupList table */ + public: + DEFINE_SIZE_STATIC (10); +}; + + +} /* namespace OT */ + + +#endif /* HB_OT_LAYOUT_GSUBGPOS_PRIVATE_HH */ |