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+/*
+ * Copyright © 2007,2008,2009,2010 Red Hat, Inc.
+ * Copyright © 2010,2012 Google, Inc.
+ *
+ * This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Red Hat Author(s): Behdad Esfahbod
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#ifndef HB_OT_LAYOUT_GSUBGPOS_HH
+#define HB_OT_LAYOUT_GSUBGPOS_HH
+
+#include "hb.hh"
+#include "hb-buffer.hh"
+#include "hb-map.hh"
+#include "hb-set.hh"
+#include "hb-ot-map.hh"
+#include "hb-ot-layout-common.hh"
+#include "hb-ot-layout-gdef-table.hh"
+
+
+namespace OT {
+
+
+struct hb_intersects_context_t :
+ hb_dispatch_context_t<hb_intersects_context_t, bool, 0>
+{
+ const char *get_name () { return "INTERSECTS"; }
+ template <typename T>
+ return_t dispatch (const T &obj) { return obj.intersects (this->glyphs); }
+ static return_t default_return_value () { return false; }
+ bool stop_sublookup_iteration (return_t r) const { return r; }
+
+ const hb_set_t *glyphs;
+ unsigned int debug_depth;
+
+ hb_intersects_context_t (const hb_set_t *glyphs_) :
+ glyphs (glyphs_),
+ debug_depth (0) {}
+};
+
+struct hb_closure_context_t :
+ hb_dispatch_context_t<hb_closure_context_t, hb_void_t, 0>
+{
+ const char *get_name () { return "CLOSURE"; }
+ typedef return_t (*recurse_func_t) (hb_closure_context_t *c, unsigned int lookup_index);
+ template <typename T>
+ return_t dispatch (const T &obj) { obj.closure (this); return HB_VOID; }
+ static return_t default_return_value () { return HB_VOID; }
+ void recurse (unsigned int lookup_index)
+ {
+ if (unlikely (nesting_level_left == 0 || !recurse_func))
+ return;
+
+ nesting_level_left--;
+ recurse_func (this, lookup_index);
+ nesting_level_left++;
+ }
+
+ bool should_visit_lookup (unsigned int lookup_index)
+ {
+ if (is_lookup_done (lookup_index))
+ return false;
+ done_lookups->set (lookup_index, glyphs->get_population ());
+ return true;
+ }
+
+ bool is_lookup_done (unsigned int lookup_index)
+ {
+ /* Have we visited this lookup with the current set of glyphs? */
+ return done_lookups->get (lookup_index) == glyphs->get_population ();
+ }
+
+ hb_face_t *face;
+ hb_set_t *glyphs;
+ hb_set_t out[1];
+ 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_,
+ hb_map_t *done_lookups_,
+ unsigned int nesting_level_left_ = HB_MAX_NESTING_LEVEL) :
+ face (face_),
+ glyphs (glyphs_),
+ recurse_func (nullptr),
+ nesting_level_left (nesting_level_left_),
+ debug_depth (0),
+ done_lookups (done_lookups_) {}
+
+ ~hb_closure_context_t () { flush (); }
+
+ void set_recurse_func (recurse_func_t func) { recurse_func = func; }
+
+ void flush ()
+ {
+ hb_set_union (glyphs, out);
+ hb_set_clear (out);
+ }
+
+ private:
+ hb_map_t *done_lookups;
+};
+
+
+struct hb_would_apply_context_t :
+ hb_dispatch_context_t<hb_would_apply_context_t, bool, HB_DEBUG_WOULD_APPLY>
+{
+ const char *get_name () { return "WOULD_APPLY"; }
+ template <typename T>
+ return_t dispatch (const T &obj) { return obj.would_apply (this); }
+ static return_t default_return_value () { return false; }
+ bool stop_sublookup_iteration (return_t r) const { return r; }
+
+ hb_face_t *face;
+ const hb_codepoint_t *glyphs;
+ unsigned int len;
+ bool zero_context;
+ 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) {}
+};
+
+
+struct hb_collect_glyphs_context_t :
+ hb_dispatch_context_t<hb_collect_glyphs_context_t, hb_void_t, 0>
+{
+ const char *get_name () { return "COLLECT_GLYPHS"; }
+ typedef return_t (*recurse_func_t) (hb_collect_glyphs_context_t *c, unsigned int lookup_index);
+ template <typename T>
+ return_t dispatch (const T &obj) { obj.collect_glyphs (this); return HB_VOID; }
+ static return_t default_return_value () { return HB_VOID; }
+ void recurse (unsigned int lookup_index)
+ {
+ if (unlikely (nesting_level_left == 0 || !recurse_func))
+ return;
+
+ /* Note that GPOS sets recurse_func to nullptr already, so it doesn't get
+ * past the previous check. For GSUB, we only want to collect the output
+ * glyphs in the recursion. If output is not requested, we can go home now.
+ *
+ * Note further, that the above is not exactly correct. A recursed lookup
+ * is allowed to match input that is not matched in the context, but that's
+ * not how most fonts are built. It's possible to relax that and recurse
+ * with all sets here if it proves to be an issue.
+ */
+
+ if (output == hb_set_get_empty ())
+ return;
+
+ /* Return if new lookup was recursed to before. */
+ if (recursed_lookups->has (lookup_index))
+ return;
+
+ hb_set_t *old_before = before;
+ hb_set_t *old_input = input;
+ hb_set_t *old_after = after;
+ before = input = after = hb_set_get_empty ();
+
+ nesting_level_left--;
+ recurse_func (this, lookup_index);
+ nesting_level_left++;
+
+ before = old_before;
+ input = old_input;
+ after = old_after;
+
+ recursed_lookups->add (lookup_index);
+ }
+
+ hb_face_t *face;
+ hb_set_t *before;
+ hb_set_t *input;
+ hb_set_t *after;
+ hb_set_t *output;
+ recurse_func_t recurse_func;
+ hb_set_t *recursed_lookups;
+ unsigned int nesting_level_left;
+ 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_ = HB_MAX_NESTING_LEVEL) :
+ face (face_),
+ before (glyphs_before ? glyphs_before : hb_set_get_empty ()),
+ input (glyphs_input ? glyphs_input : hb_set_get_empty ()),
+ after (glyphs_after ? glyphs_after : hb_set_get_empty ()),
+ output (glyphs_output ? glyphs_output : hb_set_get_empty ()),
+ recurse_func (nullptr),
+ recursed_lookups (hb_set_create ()),
+ nesting_level_left (nesting_level_left_),
+ debug_depth (0) {}
+ ~hb_collect_glyphs_context_t () { hb_set_destroy (recursed_lookups); }
+
+ void set_recurse_func (recurse_func_t func) { recurse_func = func; }
+};
+
+
+
+template <typename set_t>
+struct hb_add_coverage_context_t :
+ hb_dispatch_context_t<hb_add_coverage_context_t<set_t>, const Coverage &, HB_DEBUG_GET_COVERAGE>
+{
+ const char *get_name () { return "GET_COVERAGE"; }
+ typedef const Coverage &return_t;
+ template <typename T>
+ return_t dispatch (const T &obj) { return obj.get_coverage (); }
+ static return_t default_return_value () { return Null(Coverage); }
+ bool stop_sublookup_iteration (return_t r) const
+ {
+ r.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;
+};
+
+
+struct hb_ot_apply_context_t :
+ hb_dispatch_context_t<hb_ot_apply_context_t, bool, HB_DEBUG_APPLY>
+{
+ struct matcher_t
+ {
+ matcher_t () :
+ lookup_props (0),
+ 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 (nullptr),
+ match_data (nullptr) {}
+
+ typedef bool (*match_func_t) (hb_codepoint_t glyph_id, const HBUINT16 &value, const void *data);
+
+ void set_ignore_zwnj (bool ignore_zwnj_) { ignore_zwnj = ignore_zwnj_; }
+ void set_ignore_zwj (bool ignore_zwj_) { ignore_zwj = ignore_zwj_; }
+ void set_lookup_props (unsigned int lookup_props_) { lookup_props = lookup_props_; }
+ void set_mask (hb_mask_t mask_) { mask = mask_; }
+ void set_syllable (uint8_t syllable_) { syllable = syllable_; }
+ void set_match_func (match_func_t match_func_,
+ const void *match_data_)
+ { match_func = match_func_; match_data = match_data_; }
+
+ enum may_match_t {
+ MATCH_NO,
+ MATCH_YES,
+ MATCH_MAYBE
+ };
+
+ may_match_t may_match (const hb_glyph_info_t &info,
+ const HBUINT16 *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
+ };
+
+ may_skip_t may_skip (const hb_ot_apply_context_t *c,
+ const hb_glyph_info_t &info) const
+ {
+ if (!c->check_glyph_property (&info, lookup_props))
+ return SKIP_YES;
+
+ if (unlikely (_hb_glyph_info_is_default_ignorable_and_not_hidden (&info) &&
+ (ignore_zwnj || !_hb_glyph_info_is_zwnj (&info)) &&
+ (ignore_zwj || !_hb_glyph_info_is_zwj (&info))))
+ return SKIP_MAYBE;
+
+ return SKIP_NO;
+ }
+
+ protected:
+ unsigned int lookup_props;
+ 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
+ {
+ void init (hb_ot_apply_context_t *c_, bool context_match = false)
+ {
+ c = c_;
+ match_glyph_data = nullptr;
+ matcher.set_match_func (nullptr, nullptr);
+ matcher.set_lookup_props (c->lookup_props);
+ /* Ignore ZWNJ if we are matching GPOS, or matching GSUB context and asked to. */
+ matcher.set_ignore_zwnj (c->table_index == 1 || (context_match && c->auto_zwnj));
+ /* Ignore ZWJ if we are matching context, or asked to. */
+ matcher.set_ignore_zwj (context_match || c->auto_zwj);
+ matcher.set_mask (context_match ? -1 : c->lookup_mask);
+ }
+ void set_lookup_props (unsigned int lookup_props)
+ {
+ matcher.set_lookup_props (lookup_props);
+ }
+ void set_match_func (matcher_t::match_func_t match_func_,
+ const void *match_data_,
+ const HBUINT16 glyph_data[])
+ {
+ matcher.set_match_func (match_func_, match_data_);
+ match_glyph_data = glyph_data;
+ }
+
+ void reset (unsigned int start_index_,
+ unsigned int num_items_)
+ {
+ idx = start_index_;
+ num_items = num_items_;
+ end = c->buffer->len;
+ matcher.set_syllable (start_index_ == c->buffer->idx ? c->buffer->cur().syllable () : 0);
+ }
+
+ void reject () { num_items++; match_glyph_data--; }
+
+ matcher_t::may_skip_t
+ may_skip (const hb_glyph_info_t &info) const
+ { return matcher.may_skip (c, info); }
+
+ bool next ()
+ {
+ 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;
+ }
+ bool prev ()
+ {
+ assert (num_items > 0);
+ while (idx > num_items - 1)
+ {
+ 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_ot_apply_context_t *c;
+ matcher_t matcher;
+ const HBUINT16 *match_glyph_data;
+
+ unsigned int num_items;
+ unsigned int end;
+ };
+
+
+ const char *get_name () { return "APPLY"; }
+ typedef return_t (*recurse_func_t) (hb_ot_apply_context_t *c, unsigned int lookup_index);
+ template <typename T>
+ return_t dispatch (const T &obj) { return obj.apply (this); }
+ static return_t default_return_value () { return false; }
+ bool stop_sublookup_iteration (return_t r) const { return r; }
+ return_t recurse (unsigned int sub_lookup_index)
+ {
+ if (unlikely (nesting_level_left == 0 || !recurse_func || buffer->max_ops-- <= 0))
+ return default_return_value ();
+
+ nesting_level_left--;
+ bool ret = recurse_func (this, sub_lookup_index);
+ nesting_level_left++;
+ return ret;
+ }
+
+ skipping_iterator_t iter_input, iter_context;
+
+ hb_font_t *font;
+ hb_face_t *face;
+ hb_buffer_t *buffer;
+ recurse_func_t recurse_func;
+ const GDEF &gdef;
+ const VariationStore &var_store;
+
+ hb_direction_t direction;
+ hb_mask_t lookup_mask;
+ unsigned int table_index; /* GSUB/GPOS */
+ unsigned int lookup_index;
+ unsigned int lookup_props;
+ unsigned int nesting_level_left;
+ unsigned int debug_depth;
+
+ bool has_glyph_classes;
+ bool auto_zwnj;
+ bool auto_zwj;
+ bool random;
+
+ uint32_t random_state;
+
+
+ hb_ot_apply_context_t (unsigned int table_index_,
+ hb_font_t *font_,
+ hb_buffer_t *buffer_) :
+ iter_input (), iter_context (),
+ font (font_), face (font->face), buffer (buffer_),
+ recurse_func (nullptr),
+ gdef (*face->table.GDEF->table),
+ var_store (gdef.get_var_store ()),
+ direction (buffer_->props.direction),
+ lookup_mask (1),
+ table_index (table_index_),
+ lookup_index ((unsigned int) -1),
+ lookup_props (0),
+ nesting_level_left (HB_MAX_NESTING_LEVEL),
+ debug_depth (0),
+ has_glyph_classes (gdef.has_glyph_classes ()),
+ auto_zwnj (true),
+ auto_zwj (true),
+ random (false),
+ random_state (1) { init_iters (); }
+
+ void init_iters ()
+ {
+ iter_input.init (this, false);
+ iter_context.init (this, true);
+ }
+
+ void set_lookup_mask (hb_mask_t mask) { lookup_mask = mask; init_iters (); }
+ void set_auto_zwj (bool auto_zwj_) { auto_zwj = auto_zwj_; init_iters (); }
+ void set_auto_zwnj (bool auto_zwnj_) { auto_zwnj = auto_zwnj_; init_iters (); }
+ void set_random (bool random_) { random = random_; }
+ void set_recurse_func (recurse_func_t func) { recurse_func = func; }
+ void set_lookup_index (unsigned int lookup_index_) { lookup_index = lookup_index_; }
+ void set_lookup_props (unsigned int lookup_props_) { lookup_props = lookup_props_; init_iters (); }
+
+ uint32_t random_number ()
+ {
+ /* http://www.cplusplus.com/reference/random/minstd_rand/ */
+ random_state = random_state * 48271 % 2147483647;
+ return random_state;
+ }
+
+ bool match_properties_mark (hb_codepoint_t glyph,
+ unsigned int glyph_props,
+ unsigned int match_props) const
+ {
+ /* If using mark filtering sets, the high short of
+ * match_props has the set index.
+ */
+ if (match_props & LookupFlag::UseMarkFilteringSet)
+ return gdef.mark_set_covers (match_props >> 16, glyph);
+
+ /* The second byte of match_props has the meaning
+ * "ignore marks of attachment type different than
+ * the attachment type specified."
+ */
+ if (match_props & LookupFlag::MarkAttachmentType)
+ return (match_props & LookupFlag::MarkAttachmentType) == (glyph_props & LookupFlag::MarkAttachmentType);
+
+ return true;
+ }
+
+ bool check_glyph_property (const hb_glyph_info_t *info,
+ unsigned int match_props) const
+ {
+ hb_codepoint_t glyph = info->codepoint;
+ unsigned int glyph_props = _hb_glyph_info_get_glyph_props (info);
+
+ /* Not covered, if, for example, glyph class is ligature and
+ * match_props includes LookupFlags::IgnoreLigatures
+ */
+ if (glyph_props & match_props & LookupFlag::IgnoreFlags)
+ return false;
+
+ if (unlikely (glyph_props & HB_OT_LAYOUT_GLYPH_PROPS_MARK))
+ return match_properties_mark (glyph, glyph_props, match_props);
+
+ return true;
+ }
+
+ void _set_glyph_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 substitutions. Ie. if you ligate, expand,
+ * and ligate again, it forgives the multiplication and acts as
+ * if only ligation happened. As such, clear MULTIPLIED bit.
+ */
+ 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);
+ }
+
+ void replace_glyph (hb_codepoint_t glyph_index) const
+ {
+ _set_glyph_props (glyph_index);
+ buffer->replace_glyph (glyph_index);
+ }
+ void replace_glyph_inplace (hb_codepoint_t glyph_index) const
+ {
+ _set_glyph_props (glyph_index);
+ buffer->cur().codepoint = glyph_index;
+ }
+ 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);
+ }
+ 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);
+ }
+};
+
+
+struct hb_get_subtables_context_t :
+ hb_dispatch_context_t<hb_get_subtables_context_t, hb_void_t, HB_DEBUG_APPLY>
+{
+ template <typename Type>
+ static bool apply_to (const void *obj, OT::hb_ot_apply_context_t *c)
+ {
+ const Type *typed_obj = (const Type *) obj;
+ return typed_obj->apply (c);
+ }
+
+ typedef bool (*hb_apply_func_t) (const void *obj, OT::hb_ot_apply_context_t *c);
+
+ struct hb_applicable_t
+ {
+ template <typename T>
+ void init (const T &obj_, hb_apply_func_t apply_func_)
+ {
+ obj = &obj_;
+ apply_func = apply_func_;
+ digest.init ();
+ obj_.get_coverage ().add_coverage (&digest);
+ }
+
+ bool apply (OT::hb_ot_apply_context_t *c) const
+ {
+ return digest.may_have (c->buffer->cur().codepoint) && apply_func (obj, c);
+ }
+
+ private:
+ const void *obj;
+ hb_apply_func_t apply_func;
+ hb_set_digest_t digest;
+ };
+
+ typedef hb_vector_t<hb_applicable_t> array_t;
+
+ /* Dispatch interface. */
+ const char *get_name () { return "GET_SUBTABLES"; }
+ template <typename T>
+ return_t dispatch (const T &obj)
+ {
+ hb_applicable_t *entry = array.push();
+ entry->init (obj, apply_to<T>);
+ return HB_VOID;
+ }
+ static return_t default_return_value () { return HB_VOID; }
+
+ hb_get_subtables_context_t (array_t &array_) :
+ array (array_),
+ debug_depth (0) {}
+
+ array_t &array;
+ unsigned int debug_depth;
+};
+
+
+
+
+typedef bool (*intersects_func_t) (const hb_set_t *glyphs, const HBUINT16 &value, const void *data);
+typedef void (*collect_glyphs_func_t) (hb_set_t *glyphs, const HBUINT16 &value, const void *data);
+typedef bool (*match_func_t) (hb_codepoint_t glyph_id, const HBUINT16 &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 (const hb_set_t *glyphs, const HBUINT16 &value, const void *data HB_UNUSED)
+{
+ return glyphs->has (value);
+}
+static inline bool intersects_class (const hb_set_t *glyphs, const HBUINT16 &value, const void *data)
+{
+ const ClassDef &class_def = *reinterpret_cast<const ClassDef *>(data);
+ return class_def.intersects_class (glyphs, value);
+}
+static inline bool intersects_coverage (const hb_set_t *glyphs, const HBUINT16 &value, const void *data)
+{
+ const OffsetTo<Coverage> &coverage = (const OffsetTo<Coverage>&)value;
+ return (data+coverage).intersects (glyphs);
+}
+
+static inline bool intersects_array (const hb_set_t *glyphs,
+ unsigned int count,
+ const HBUINT16 values[],
+ intersects_func_t intersects_func,
+ const void *intersects_data)
+{
+ for (unsigned int i = 0; i < count; i++)
+ if (likely (!intersects_func (glyphs, values[i], intersects_data)))
+ return false;
+ return true;
+}
+
+
+static inline void collect_glyph (hb_set_t *glyphs, const HBUINT16 &value, const void *data HB_UNUSED)
+{
+ glyphs->add (value);
+}
+static inline void collect_class (hb_set_t *glyphs, const HBUINT16 &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 HBUINT16 &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 HBUINT16 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 HBUINT16 &value, const void *data HB_UNUSED)
+{
+ return glyph_id == value;
+}
+static inline bool match_class (hb_codepoint_t glyph_id, const HBUINT16 &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 HBUINT16 &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 HBUINT16 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_ot_apply_context_t *c,
+ unsigned int count, /* Including the first glyph (not matched) */
+ const HBUINT16 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[HB_MAX_CONTEXT_LENGTH],
+ unsigned int *p_total_component_count = nullptr)
+{
+ TRACE_APPLY (nullptr);
+
+ if (unlikely (count > HB_MAX_CONTEXT_LENGTH)) return_trace (false);
+
+ hb_buffer_t *buffer = c->buffer;
+
+ hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_input;
+ skippy_iter.reset (buffer->idx, count - 1);
+ skippy_iter.set_match_func (match_func, match_data, input);
+
+ /*
+ * This is perhaps the trickiest part of OpenType... Remarks:
+ *
+ * - If all components of the ligature were marks, we call this a mark ligature.
+ *
+ * - If there is no GDEF, and the ligature is NOT a mark ligature, we categorize
+ * it as a ligature glyph.
+ *
+ * - Ligatures cannot be formed across glyphs attached to different components
+ * of previous ligatures. Eg. the sequence is LAM,SHADDA,LAM,FATHA,HEH, and
+ * LAM,LAM,HEH form a ligature, leaving SHADDA,FATHA next to eachother.
+ * However, it would be wrong to ligate that SHADDA,FATHA sequence.
+ * There are a couple of exceptions to this:
+ *
+ * o If a ligature tries ligating with marks that belong to it itself, go ahead,
+ * assuming that the font designer knows what they are doing (otherwise it can
+ * break Indic stuff when a matra wants to ligate with a conjunct,
+ *
+ * o If two marks want to ligate and they belong to different components of the
+ * same ligature glyph, and said ligature glyph is to be ignored according to
+ * mark-filtering rules, then allow.
+ * https://github.com/harfbuzz/harfbuzz/issues/545
+ */
+
+ unsigned int total_component_count = 0;
+ total_component_count += _hb_glyph_info_get_lig_num_comps (&buffer->cur());
+
+ unsigned int first_lig_id = _hb_glyph_info_get_lig_id (&buffer->cur());
+ unsigned int first_lig_comp = _hb_glyph_info_get_lig_comp (&buffer->cur());
+
+ enum {
+ LIGBASE_NOT_CHECKED,
+ LIGBASE_MAY_NOT_SKIP,
+ LIGBASE_MAY_SKIP
+ } ligbase = LIGBASE_NOT_CHECKED;
+
+ match_positions[0] = buffer->idx;
+ for (unsigned int i = 1; i < count; i++)
+ {
+ if (!skippy_iter.next ()) return_trace (false);
+
+ match_positions[i] = skippy_iter.idx;
+
+ unsigned int this_lig_id = _hb_glyph_info_get_lig_id (&buffer->info[skippy_iter.idx]);
+ unsigned int this_lig_comp = _hb_glyph_info_get_lig_comp (&buffer->info[skippy_iter.idx]);
+
+ if (first_lig_id && first_lig_comp)
+ {
+ /* If first component was attached to a previous ligature component,
+ * all subsequent components should be attached to the same ligature
+ * component, otherwise we shouldn't ligate them... */
+ if (first_lig_id != this_lig_id || first_lig_comp != this_lig_comp)
+ {
+ /* ...unless, we are attached to a base ligature and that base
+ * ligature is ignorable. */
+ if (ligbase == LIGBASE_NOT_CHECKED)
+ {
+ bool found = false;
+ const hb_glyph_info_t *out = buffer->out_info;
+ unsigned int j = buffer->out_len;
+ while (j && _hb_glyph_info_get_lig_id (&out[j - 1]) == first_lig_id)
+ {
+ if (_hb_glyph_info_get_lig_comp (&out[j - 1]) == 0)
+ {
+ j--;
+ found = true;
+ break;
+ }
+ j--;
+ }
+
+ if (found && skippy_iter.may_skip (out[j]) == hb_ot_apply_context_t::matcher_t::SKIP_YES)
+ ligbase = LIGBASE_MAY_SKIP;
+ else
+ ligbase = LIGBASE_MAY_NOT_SKIP;
+ }
+
+ if (ligbase == LIGBASE_MAY_NOT_SKIP)
+ return_trace (false);
+ }
+ }
+ else
+ {
+ /* If first component was NOT attached to a previous ligature component,
+ * all subsequent components should also NOT be attached to any ligature
+ * component, unless they are attached to the first component itself! */
+ if (this_lig_id && this_lig_comp && (this_lig_id != first_lig_id))
+ return_trace (false);
+ }
+
+ total_component_count += _hb_glyph_info_get_lig_num_comps (&buffer->info[skippy_iter.idx]);
+ }
+
+ *end_offset = skippy_iter.idx - buffer->idx + 1;
+
+ if (p_total_component_count)
+ *p_total_component_count = total_component_count;
+
+ return_trace (true);
+}
+static inline bool ligate_input (hb_ot_apply_context_t *c,
+ unsigned int count, /* Including the first glyph */
+ const unsigned int match_positions[HB_MAX_CONTEXT_LENGTH], /* Including the first glyph */
+ unsigned int match_length,
+ hb_codepoint_t lig_glyph,
+ unsigned int total_component_count)
+{
+ TRACE_APPLY (nullptr);
+
+ hb_buffer_t *buffer = c->buffer;
+
+ buffer->merge_clusters (buffer->idx, buffer->idx + match_length);
+
+ /* - If a base and one or more marks ligate, consider that as a base, NOT
+ * ligature, such that all following marks can still attach to it.
+ * https://github.com/harfbuzz/harfbuzz/issues/1109
+ *
+ * - If all components of the ligature were marks, we call this a mark ligature.
+ * If it *is* a mark ligature, we don't allocate a new ligature id, and leave
+ * the ligature to keep its old ligature id. This will allow it to attach to
+ * a base ligature in GPOS. Eg. if the sequence is: LAM,LAM,SHADDA,FATHA,HEH,
+ * and LAM,LAM,HEH for a ligature, they will leave SHADDA and FATHA with a
+ * ligature id and component value of 2. Then if SHADDA,FATHA form a ligature
+ * later, we don't want them to lose their ligature id/component, otherwise
+ * GPOS will fail to correctly position the mark ligature on top of the
+ * LAM,LAM,HEH ligature. See:
+ * https://bugzilla.gnome.org/show_bug.cgi?id=676343
+ *
+ * - If a ligature is formed of components that some of which are also ligatures
+ * themselves, and those ligature components had marks attached to *their*
+ * components, we have to attach the marks to the new ligature component
+ * positions! Now *that*'s tricky! And these marks may be following the
+ * last component of the whole sequence, so we should loop forward looking
+ * for them and update them.
+ *
+ * Eg. the sequence is LAM,LAM,SHADDA,FATHA,HEH, and the font first forms a
+ * 'calt' ligature of LAM,HEH, leaving the SHADDA and FATHA with a ligature
+ * id and component == 1. Now, during 'liga', the LAM and the LAM-HEH ligature
+ * form a LAM-LAM-HEH ligature. We need to reassign the SHADDA and FATHA to
+ * the new ligature with a component value of 2.
+ *
+ * This in fact happened to a font... See:
+ * https://bugzilla.gnome.org/show_bug.cgi?id=437633
+ */
+
+ bool is_base_ligature = _hb_glyph_info_is_base_glyph (&buffer->info[match_positions[0]]);
+ bool is_mark_ligature = _hb_glyph_info_is_mark (&buffer->info[match_positions[0]]);
+ for (unsigned int i = 1; i < count; i++)
+ if (!_hb_glyph_info_is_mark (&buffer->info[match_positions[i]]))
+ {
+ is_base_ligature = false;
+ is_mark_ligature = false;
+ break;
+ }
+ bool is_ligature = !is_base_ligature && !is_mark_ligature;
+
+ unsigned int klass = is_ligature ? HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE : 0;
+ unsigned int lig_id = is_ligature ? _hb_allocate_lig_id (buffer) : 0;
+ unsigned int last_lig_id = _hb_glyph_info_get_lig_id (&buffer->cur());
+ unsigned int last_num_components = _hb_glyph_info_get_lig_num_comps (&buffer->cur());
+ unsigned int components_so_far = last_num_components;
+
+ if (is_ligature)
+ {
+ _hb_glyph_info_set_lig_props_for_ligature (&buffer->cur(), lig_id, total_component_count);
+ if (_hb_glyph_info_get_general_category (&buffer->cur()) == HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)
+ {
+ _hb_glyph_info_set_general_category (&buffer->cur(), HB_UNICODE_GENERAL_CATEGORY_OTHER_LETTER);
+ }
+ }
+ c->replace_glyph_with_ligature (lig_glyph, klass);
+
+ for (unsigned int i = 1; i < count; i++)
+ {
+ while (buffer->idx < match_positions[i] && buffer->successful)
+ {
+ if (is_ligature)
+ {
+ unsigned int this_comp = _hb_glyph_info_get_lig_comp (&buffer->cur());
+ if (this_comp == 0)
+ this_comp = last_num_components;
+ unsigned int new_lig_comp = components_so_far - last_num_components +
+ MIN (this_comp, 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 this_comp = _hb_glyph_info_get_lig_comp (&buffer->info[i]);
+ if (!this_comp)
+ break;
+ unsigned int new_lig_comp = components_so_far - last_num_components +
+ MIN (this_comp, last_num_components);
+ _hb_glyph_info_set_lig_props_for_mark (&buffer->info[i], lig_id, new_lig_comp);
+ } else
+ break;
+ }
+ }
+ return_trace (true);
+}
+
+static inline bool match_backtrack (hb_ot_apply_context_t *c,
+ unsigned int count,
+ const HBUINT16 backtrack[],
+ match_func_t match_func,
+ const void *match_data,
+ unsigned int *match_start)
+{
+ TRACE_APPLY (nullptr);
+
+ hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_context;
+ skippy_iter.reset (c->buffer->backtrack_len (), count);
+ skippy_iter.set_match_func (match_func, match_data, backtrack);
+
+ for (unsigned int i = 0; i < count; i++)
+ if (!skippy_iter.prev ())
+ return_trace (false);
+
+ *match_start = skippy_iter.idx;
+
+ return_trace (true);
+}
+
+static inline bool match_lookahead (hb_ot_apply_context_t *c,
+ unsigned int count,
+ const HBUINT16 lookahead[],
+ match_func_t match_func,
+ const void *match_data,
+ unsigned int offset,
+ unsigned int *end_index)
+{
+ TRACE_APPLY (nullptr);
+
+ hb_ot_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 (false);
+
+ *end_index = skippy_iter.idx + 1;
+
+ return_trace (true);
+}
+
+
+
+struct LookupRecord
+{
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this));
+ }
+
+ HBUINT16 sequenceIndex; /* Index into current glyph
+ * sequence--first glyph = 0 */
+ HBUINT16 lookupListIndex; /* Lookup to apply to that
+ * position--zero--based */
+ public:
+ DEFINE_SIZE_STATIC (4);
+};
+
+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_ot_apply_context_t *c,
+ unsigned int count, /* Including the first glyph */
+ unsigned int match_positions[HB_MAX_CONTEXT_LENGTH], /* Including the first glyph */
+ unsigned int lookupCount,
+ const LookupRecord lookupRecord[], /* Array of LookupRecords--in design order */
+ unsigned int match_length)
+{
+ TRACE_APPLY (nullptr);
+
+ hb_buffer_t *buffer = c->buffer;
+ int end;
+
+ /* All positions are distance from beginning of *output* buffer.
+ * Adjust. */
+ {
+ unsigned int bl = buffer->backtrack_len ();
+ end = bl + match_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 && buffer->successful; i++)
+ {
+ unsigned int idx = lookupRecord[i].sequenceIndex;
+ if (idx >= count)
+ continue;
+
+ /* Don't recurse to ourself at same position.
+ * Note that this test is too naive, it doesn't catch longer loops. */
+ if (idx == 0 && lookupRecord[i].lookupListIndex == c->lookup_index)
+ continue;
+
+ if (unlikely (!buffer->move_to (match_positions[idx])))
+ break;
+
+ if (unlikely (buffer->max_ops <= 0))
+ break;
+
+ 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.
+ *
+ * TODO:
+ *
+ * Right now, if buffer length increased by n, we assume n new glyphs
+ * were added right after the current position, and if buffer length
+ * was decreased by n, we assume n match positions after the current
+ * one where removed. The former (buffer length increased) case is
+ * fine, but the decrease case can be improved in at least two ways,
+ * both of which are significant:
+ *
+ * - If recursed-to lookup is MultipleSubst and buffer length
+ * decreased, then it's current match position that was deleted,
+ * NOT the one after it.
+ *
+ * - If buffer length was decreased by n, it does not necessarily
+ * mean that n match positions where removed, as there might
+ * have been marks and default-ignorables in the sequence. We
+ * should instead drop match positions between current-position
+ * and current-position + n instead.
+ *
+ * It should be possible to construct tests for both of these cases.
+ */
+
+ end += delta;
+ if (end <= int (match_positions[idx]))
+ {
+ /* End might end up being smaller than match_positions[idx] if the recursed
+ * lookup ended up removing many items, more than we have had matched.
+ * Just never rewind end back and get out of here.
+ * https://bugs.chromium.org/p/chromium/issues/detail?id=659496 */
+ end = match_positions[idx];
+ /* There can't be any further changes. */
+ break;
+ }
+
+ unsigned int next = idx + 1; /* next now is the position after the recursed lookup. */
+
+ if (delta > 0)
+ {
+ if (unlikely (delta + count > HB_MAX_CONTEXT_LENGTH))
+ break;
+ }
+ else
+ {
+ /* NOTE: delta is 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 (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 bool context_intersects (const hb_set_t *glyphs,
+ unsigned int inputCount, /* Including the first glyph (not matched) */
+ const HBUINT16 input[], /* Array of input values--start with second glyph */
+ ContextClosureLookupContext &lookup_context)
+{
+ return intersects_array (glyphs,
+ inputCount ? inputCount - 1 : 0, input,
+ lookup_context.funcs.intersects, lookup_context.intersects_data);
+}
+
+static inline void context_closure_lookup (hb_closure_context_t *c,
+ unsigned int inputCount, /* Including the first glyph (not matched) */
+ const HBUINT16 input[], /* Array of input values--start with second glyph */
+ unsigned int lookupCount,
+ const LookupRecord lookupRecord[],
+ ContextClosureLookupContext &lookup_context)
+{
+ if (context_intersects (c->glyphs,
+ inputCount, input,
+ lookup_context))
+ 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 HBUINT16 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 HBUINT16 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_ot_apply_context_t *c,
+ unsigned int inputCount, /* Including the first glyph (not matched) */
+ const HBUINT16 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[HB_MAX_CONTEXT_LENGTH];
+ return match_input (c,
+ inputCount, input,
+ lookup_context.funcs.match, lookup_context.match_data,
+ &match_length, match_positions)
+ && (c->buffer->unsafe_to_break (c->buffer->idx, c->buffer->idx + match_length),
+ apply_lookup (c,
+ inputCount, match_positions,
+ lookupCount, lookupRecord,
+ match_length));
+}
+
+struct Rule
+{
+ bool intersects (const hb_set_t *glyphs, ContextClosureLookupContext &lookup_context) const
+ {
+ return context_intersects (glyphs,
+ inputCount, inputZ.arrayZ,
+ lookup_context);
+ }
+
+ void closure (hb_closure_context_t *c, ContextClosureLookupContext &lookup_context) const
+ {
+ const UnsizedArrayOf<LookupRecord> &lookupRecord = StructAfter<UnsizedArrayOf<LookupRecord> >
+ (inputZ.as_array ((inputCount ? inputCount - 1 : 0)));
+ context_closure_lookup (c,
+ inputCount, inputZ.arrayZ,
+ lookupCount, lookupRecord.arrayZ,
+ lookup_context);
+ }
+
+ void collect_glyphs (hb_collect_glyphs_context_t *c,
+ ContextCollectGlyphsLookupContext &lookup_context) const
+ {
+ const UnsizedArrayOf<LookupRecord> &lookupRecord = StructAfter<UnsizedArrayOf<LookupRecord> >
+ (inputZ.as_array (inputCount ? inputCount - 1 : 0));
+ context_collect_glyphs_lookup (c,
+ inputCount, inputZ.arrayZ,
+ lookupCount, lookupRecord.arrayZ,
+ lookup_context);
+ }
+
+ bool would_apply (hb_would_apply_context_t *c,
+ ContextApplyLookupContext &lookup_context) const
+ {
+ TRACE_WOULD_APPLY (this);
+ const UnsizedArrayOf<LookupRecord> &lookupRecord = StructAfter<UnsizedArrayOf<LookupRecord> >
+ (inputZ.as_array (inputCount ? inputCount - 1 : 0));
+ return_trace (context_would_apply_lookup (c, inputCount, inputZ.arrayZ, lookupCount, lookupRecord.arrayZ, lookup_context));
+ }
+
+ bool apply (hb_ot_apply_context_t *c,
+ ContextApplyLookupContext &lookup_context) const
+ {
+ TRACE_APPLY (this);
+ const UnsizedArrayOf<LookupRecord> &lookupRecord = StructAfter<UnsizedArrayOf<LookupRecord> >
+ (inputZ.as_array (inputCount ? inputCount - 1 : 0));
+ return_trace (context_apply_lookup (c, inputCount, inputZ.arrayZ, lookupCount, lookupRecord.arrayZ, lookup_context));
+ }
+
+ public:
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (inputCount.sanitize (c) &&
+ lookupCount.sanitize (c) &&
+ c->check_range (inputZ.arrayZ,
+ inputZ.item_size * (inputCount ? inputCount - 1 : 0) +
+ LookupRecord::static_size * lookupCount));
+ }
+
+ protected:
+ HBUINT16 inputCount; /* Total number of glyphs in input
+ * glyph sequence--includes the first
+ * glyph */
+ HBUINT16 lookupCount; /* Number of LookupRecords */
+ UnsizedArrayOf<HBUINT16>
+ inputZ; /* Array of match inputs--start with
+ * second glyph */
+/*UnsizedArrayOf<LookupRecord>
+ lookupRecordX;*/ /* Array of LookupRecords--in
+ * design order */
+ public:
+ DEFINE_SIZE_ARRAY (4, inputZ);
+};
+
+struct RuleSet
+{
+ bool intersects (const hb_set_t *glyphs,
+ ContextClosureLookupContext &lookup_context) const
+ {
+ unsigned int num_rules = rule.len;
+ for (unsigned int i = 0; i < num_rules; i++)
+ if ((this+rule[i]).intersects (glyphs, lookup_context))
+ return true;
+ return false;
+ }
+
+ void closure (hb_closure_context_t *c,
+ ContextClosureLookupContext &lookup_context) const
+ {
+ unsigned int num_rules = rule.len;
+ for (unsigned int i = 0; i < num_rules; i++)
+ (this+rule[i]).closure (c, lookup_context);
+ }
+
+ void collect_glyphs (hb_collect_glyphs_context_t *c,
+ ContextCollectGlyphsLookupContext &lookup_context) const
+ {
+ unsigned int num_rules = rule.len;
+ for (unsigned int i = 0; i < num_rules; i++)
+ (this+rule[i]).collect_glyphs (c, lookup_context);
+ }
+
+ 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 (true);
+ }
+ return_trace (false);
+ }
+
+ bool apply (hb_ot_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 (true);
+ }
+ return_trace (false);
+ }
+
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (rule.sanitize (c, this));
+ }
+
+ protected:
+ OffsetArrayOf<Rule>
+ rule; /* Array of Rule tables
+ * ordered by preference */
+ public:
+ DEFINE_SIZE_ARRAY (2, rule);
+};
+
+
+struct ContextFormat1
+{
+ bool intersects (const hb_set_t *glyphs) const
+ {
+ struct ContextClosureLookupContext lookup_context = {
+ {intersects_glyph},
+ nullptr
+ };
+
+ unsigned int count = ruleSet.len;
+ for (Coverage::Iter iter (this+coverage); iter.more (); iter.next ())
+ {
+ if (unlikely (iter.get_coverage () >= count))
+ break; /* Work around malicious fonts. https://github.com/harfbuzz/harfbuzz/issues/363 */
+ if (glyphs->has (iter.get_glyph ()) &&
+ (this+ruleSet[iter.get_coverage ()]).intersects (glyphs, lookup_context))
+ return true;
+ }
+ return false;
+ }
+
+ void closure (hb_closure_context_t *c) const
+ {
+ struct ContextClosureLookupContext lookup_context = {
+ {intersects_glyph},
+ nullptr
+ };
+
+ unsigned int count = ruleSet.len;
+ for (Coverage::Iter iter (this+coverage); iter.more (); iter.next ())
+ {
+ if (unlikely (iter.get_coverage () >= count))
+ break; /* Work around malicious fonts. https://github.com/harfbuzz/harfbuzz/issues/363 */
+ if (c->glyphs->has (iter.get_glyph ()))
+ (this+ruleSet[iter.get_coverage ()]).closure (c, lookup_context);
+ }
+ }
+
+ void collect_glyphs (hb_collect_glyphs_context_t *c) const
+ {
+ (this+coverage).add_coverage (c->input);
+
+ struct ContextCollectGlyphsLookupContext lookup_context = {
+ {collect_glyph},
+ nullptr
+ };
+
+ unsigned int count = ruleSet.len;
+ for (unsigned int i = 0; i < count; i++)
+ (this+ruleSet[i]).collect_glyphs (c, lookup_context);
+ }
+
+ 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},
+ nullptr
+ };
+ return_trace (rule_set.would_apply (c, lookup_context));
+ }
+
+ const Coverage &get_coverage () const { return this+coverage; }
+
+ bool apply (hb_ot_apply_context_t *c) const
+ {
+ TRACE_APPLY (this);
+ unsigned int index = (this+coverage).get_coverage (c->buffer->cur().codepoint);
+ if (likely (index == NOT_COVERED))
+ return_trace (false);
+
+ const RuleSet &rule_set = this+ruleSet[index];
+ struct ContextApplyLookupContext lookup_context = {
+ {match_glyph},
+ nullptr
+ };
+ return_trace (rule_set.apply (c, lookup_context));
+ }
+
+ bool subset (hb_subset_context_t *c) const
+ {
+ TRACE_SUBSET (this);
+ // TODO(subset)
+ return_trace (false);
+ }
+
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (coverage.sanitize (c, this) && ruleSet.sanitize (c, this));
+ }
+
+ protected:
+ HBUINT16 format; /* Format identifier--format = 1 */
+ 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
+{
+ bool intersects (const hb_set_t *glyphs) const
+ {
+ if (!(this+coverage).intersects (glyphs))
+ return false;
+
+ const ClassDef &class_def = this+classDef;
+
+ struct ContextClosureLookupContext lookup_context = {
+ {intersects_class},
+ &class_def
+ };
+
+ unsigned int count = ruleSet.len;
+ for (unsigned int i = 0; i < count; i++)
+ if (class_def.intersects_class (glyphs, i) &&
+ (this+ruleSet[i]).intersects (glyphs, lookup_context))
+ return true;
+
+ return false;
+ }
+
+ void closure (hb_closure_context_t *c) const
+ {
+ 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);
+ }
+ }
+
+ void collect_glyphs (hb_collect_glyphs_context_t *c) const
+ {
+ (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);
+ }
+
+ 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 (rule_set.would_apply (c, lookup_context));
+ }
+
+ const Coverage &get_coverage () const { return this+coverage; }
+
+ bool apply (hb_ot_apply_context_t *c) const
+ {
+ TRACE_APPLY (this);
+ unsigned int index = (this+coverage).get_coverage (c->buffer->cur().codepoint);
+ if (likely (index == NOT_COVERED)) return_trace (false);
+
+ const 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 (rule_set.apply (c, lookup_context));
+ }
+
+ bool subset (hb_subset_context_t *c) const
+ {
+ TRACE_SUBSET (this);
+ // TODO(subset)
+ return_trace (false);
+ }
+
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (coverage.sanitize (c, this) && classDef.sanitize (c, this) && ruleSet.sanitize (c, this));
+ }
+
+ protected:
+ HBUINT16 format; /* Format identifier--format = 2 */
+ 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
+{
+ bool intersects (const hb_set_t *glyphs) const
+ {
+ if (!(this+coverageZ[0]).intersects (glyphs))
+ return false;
+
+ struct ContextClosureLookupContext lookup_context = {
+ {intersects_coverage},
+ this
+ };
+ return context_intersects (glyphs,
+ glyphCount, (const HBUINT16 *) (coverageZ.arrayZ + 1),
+ lookup_context);
+ }
+
+ void closure (hb_closure_context_t *c) const
+ {
+ if (!(this+coverageZ[0]).intersects (c->glyphs))
+ return;
+
+ const LookupRecord *lookupRecord = &StructAfter<LookupRecord> (coverageZ.as_array (glyphCount));
+ struct ContextClosureLookupContext lookup_context = {
+ {intersects_coverage},
+ this
+ };
+ context_closure_lookup (c,
+ glyphCount, (const HBUINT16 *) (coverageZ.arrayZ + 1),
+ lookupCount, lookupRecord,
+ lookup_context);
+ }
+
+ void collect_glyphs (hb_collect_glyphs_context_t *c) const
+ {
+ (this+coverageZ[0]).add_coverage (c->input);
+
+ const LookupRecord *lookupRecord = &StructAfter<LookupRecord> (coverageZ.as_array (glyphCount));
+ struct ContextCollectGlyphsLookupContext lookup_context = {
+ {collect_coverage},
+ this
+ };
+
+ context_collect_glyphs_lookup (c,
+ glyphCount, (const HBUINT16 *) (coverageZ.arrayZ + 1),
+ lookupCount, lookupRecord,
+ lookup_context);
+ }
+
+ bool would_apply (hb_would_apply_context_t *c) const
+ {
+ TRACE_WOULD_APPLY (this);
+
+ const LookupRecord *lookupRecord = &StructAfter<LookupRecord> (coverageZ.as_array (glyphCount));
+ struct ContextApplyLookupContext lookup_context = {
+ {match_coverage},
+ this
+ };
+ return_trace (context_would_apply_lookup (c, glyphCount, (const HBUINT16 *) (coverageZ.arrayZ + 1), lookupCount, lookupRecord, lookup_context));
+ }
+
+ const Coverage &get_coverage () const { return this+coverageZ[0]; }
+
+ bool apply (hb_ot_apply_context_t *c) const
+ {
+ TRACE_APPLY (this);
+ unsigned int index = (this+coverageZ[0]).get_coverage (c->buffer->cur().codepoint);
+ if (likely (index == NOT_COVERED)) return_trace (false);
+
+ const LookupRecord *lookupRecord = &StructAfter<LookupRecord> (coverageZ.as_array (glyphCount));
+ struct ContextApplyLookupContext lookup_context = {
+ {match_coverage},
+ this
+ };
+ return_trace (context_apply_lookup (c, glyphCount, (const HBUINT16 *) (coverageZ.arrayZ + 1), lookupCount, lookupRecord, lookup_context));
+ }
+
+ bool subset (hb_subset_context_t *c) const
+ {
+ TRACE_SUBSET (this);
+ // TODO(subset)
+ return_trace (false);
+ }
+
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ if (!c->check_struct (this)) return_trace (false);
+ unsigned int count = glyphCount;
+ if (!count) return_trace (false); /* We want to access coverageZ[0] freely. */
+ if (!c->check_array (coverageZ.arrayZ, count)) return_trace (false);
+ for (unsigned int i = 0; i < count; i++)
+ if (!coverageZ[i].sanitize (c, this)) return_trace (false);
+ const LookupRecord *lookupRecord = &StructAfter<LookupRecord> (coverageZ.as_array (glyphCount));
+ return_trace (c->check_array (lookupRecord, lookupCount));
+ }
+
+ protected:
+ HBUINT16 format; /* Format identifier--format = 3 */
+ HBUINT16 glyphCount; /* Number of glyphs in the input glyph
+ * sequence */
+ HBUINT16 lookupCount; /* Number of LookupRecords */
+ UnsizedArrayOf<OffsetTo<Coverage> >
+ coverageZ; /* Array of offsets to Coverage
+ * table in glyph sequence order */
+/*UnsizedArrayOf<LookupRecord>
+ lookupRecordX;*/ /* Array of LookupRecords--in
+ * design order */
+ public:
+ DEFINE_SIZE_ARRAY (6, coverageZ);
+};
+
+struct Context
+{
+ template <typename context_t>
+ typename context_t::return_t dispatch (context_t *c) const
+ {
+ TRACE_DISPATCH (this, u.format);
+ if (unlikely (!c->may_dispatch (this, &u.format))) return_trace (c->no_dispatch_return_value ());
+ switch (u.format) {
+ case 1: return_trace (c->dispatch (u.format1));
+ case 2: return_trace (c->dispatch (u.format2));
+ case 3: return_trace (c->dispatch (u.format3));
+ default:return_trace (c->default_return_value ());
+ }
+ }
+
+ protected:
+ union {
+ HBUINT16 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 bool chain_context_intersects (const hb_set_t *glyphs,
+ unsigned int backtrackCount,
+ const HBUINT16 backtrack[],
+ unsigned int inputCount, /* Including the first glyph (not matched) */
+ const HBUINT16 input[], /* Array of input values--start with second glyph */
+ unsigned int lookaheadCount,
+ const HBUINT16 lookahead[],
+ ChainContextClosureLookupContext &lookup_context)
+{
+ return intersects_array (glyphs,
+ backtrackCount, backtrack,
+ lookup_context.funcs.intersects, lookup_context.intersects_data[0])
+ && intersects_array (glyphs,
+ inputCount ? inputCount - 1 : 0, input,
+ lookup_context.funcs.intersects, lookup_context.intersects_data[1])
+ && intersects_array (glyphs,
+ lookaheadCount, lookahead,
+ lookup_context.funcs.intersects, lookup_context.intersects_data[2]);
+}
+
+static inline void chain_context_closure_lookup (hb_closure_context_t *c,
+ unsigned int backtrackCount,
+ const HBUINT16 backtrack[],
+ unsigned int inputCount, /* Including the first glyph (not matched) */
+ const HBUINT16 input[], /* Array of input values--start with second glyph */
+ unsigned int lookaheadCount,
+ const HBUINT16 lookahead[],
+ unsigned int lookupCount,
+ const LookupRecord lookupRecord[],
+ ChainContextClosureLookupContext &lookup_context)
+{
+ if (chain_context_intersects (c->glyphs,
+ backtrackCount, backtrack,
+ inputCount, input,
+ lookaheadCount, lookahead,
+ lookup_context))
+ recurse_lookups (c,
+ lookupCount, lookupRecord);
+}
+
+static inline void chain_context_collect_glyphs_lookup (hb_collect_glyphs_context_t *c,
+ unsigned int backtrackCount,
+ const HBUINT16 backtrack[],
+ unsigned int inputCount, /* Including the first glyph (not matched) */
+ const HBUINT16 input[], /* Array of input values--start with second glyph */
+ unsigned int lookaheadCount,
+ const HBUINT16 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 HBUINT16 backtrack[] HB_UNUSED,
+ unsigned int inputCount, /* Including the first glyph (not matched) */
+ const HBUINT16 input[], /* Array of input values--start with second glyph */
+ unsigned int lookaheadCount,
+ const HBUINT16 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_ot_apply_context_t *c,
+ unsigned int backtrackCount,
+ const HBUINT16 backtrack[],
+ unsigned int inputCount, /* Including the first glyph (not matched) */
+ const HBUINT16 input[], /* Array of input values--start with second glyph */
+ unsigned int lookaheadCount,
+ const HBUINT16 lookahead[],
+ unsigned int lookupCount,
+ const LookupRecord lookupRecord[],
+ ChainContextApplyLookupContext &lookup_context)
+{
+ unsigned int start_index = 0, match_length = 0, end_index = 0;
+ unsigned int match_positions[HB_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],
+ &start_index)
+ && match_lookahead (c,
+ lookaheadCount, lookahead,
+ lookup_context.funcs.match, lookup_context.match_data[2],
+ match_length, &end_index)
+ && (c->buffer->unsafe_to_break_from_outbuffer (start_index, end_index),
+ apply_lookup (c,
+ inputCount, match_positions,
+ lookupCount, lookupRecord,
+ match_length));
+}
+
+struct ChainRule
+{
+ bool intersects (const hb_set_t *glyphs, ChainContextClosureLookupContext &lookup_context) const
+ {
+ const HeadlessArrayOf<HBUINT16> &input = StructAfter<HeadlessArrayOf<HBUINT16> > (backtrack);
+ const ArrayOf<HBUINT16> &lookahead = StructAfter<ArrayOf<HBUINT16> > (input);
+ return chain_context_intersects (glyphs,
+ backtrack.len, backtrack.arrayZ,
+ input.lenP1, input.arrayZ,
+ lookahead.len, lookahead.arrayZ,
+ lookup_context);
+ }
+
+ void closure (hb_closure_context_t *c,
+ ChainContextClosureLookupContext &lookup_context) const
+ {
+ const HeadlessArrayOf<HBUINT16> &input = StructAfter<HeadlessArrayOf<HBUINT16> > (backtrack);
+ const ArrayOf<HBUINT16> &lookahead = StructAfter<ArrayOf<HBUINT16> > (input);
+ const ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (lookahead);
+ chain_context_closure_lookup (c,
+ backtrack.len, backtrack.arrayZ,
+ input.lenP1, input.arrayZ,
+ lookahead.len, lookahead.arrayZ,
+ lookup.len, lookup.arrayZ,
+ lookup_context);
+ }
+
+ void collect_glyphs (hb_collect_glyphs_context_t *c,
+ ChainContextCollectGlyphsLookupContext &lookup_context) const
+ {
+ const HeadlessArrayOf<HBUINT16> &input = StructAfter<HeadlessArrayOf<HBUINT16> > (backtrack);
+ const ArrayOf<HBUINT16> &lookahead = StructAfter<ArrayOf<HBUINT16> > (input);
+ const ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (lookahead);
+ chain_context_collect_glyphs_lookup (c,
+ backtrack.len, backtrack.arrayZ,
+ input.lenP1, input.arrayZ,
+ lookahead.len, lookahead.arrayZ,
+ lookup.len, lookup.arrayZ,
+ lookup_context);
+ }
+
+ bool would_apply (hb_would_apply_context_t *c,
+ ChainContextApplyLookupContext &lookup_context) const
+ {
+ TRACE_WOULD_APPLY (this);
+ const HeadlessArrayOf<HBUINT16> &input = StructAfter<HeadlessArrayOf<HBUINT16> > (backtrack);
+ const ArrayOf<HBUINT16> &lookahead = StructAfter<ArrayOf<HBUINT16> > (input);
+ const ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (lookahead);
+ return_trace (chain_context_would_apply_lookup (c,
+ backtrack.len, backtrack.arrayZ,
+ input.lenP1, input.arrayZ,
+ lookahead.len, lookahead.arrayZ, lookup.len,
+ lookup.arrayZ, lookup_context));
+ }
+
+ bool apply (hb_ot_apply_context_t *c, ChainContextApplyLookupContext &lookup_context) const
+ {
+ TRACE_APPLY (this);
+ const HeadlessArrayOf<HBUINT16> &input = StructAfter<HeadlessArrayOf<HBUINT16> > (backtrack);
+ const ArrayOf<HBUINT16> &lookahead = StructAfter<ArrayOf<HBUINT16> > (input);
+ const ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (lookahead);
+ return_trace (chain_context_apply_lookup (c,
+ backtrack.len, backtrack.arrayZ,
+ input.lenP1, input.arrayZ,
+ lookahead.len, lookahead.arrayZ, lookup.len,
+ lookup.arrayZ, lookup_context));
+ }
+
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ if (!backtrack.sanitize (c)) return_trace (false);
+ const HeadlessArrayOf<HBUINT16> &input = StructAfter<HeadlessArrayOf<HBUINT16> > (backtrack);
+ if (!input.sanitize (c)) return_trace (false);
+ const ArrayOf<HBUINT16> &lookahead = StructAfter<ArrayOf<HBUINT16> > (input);
+ if (!lookahead.sanitize (c)) return_trace (false);
+ const ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (lookahead);
+ return_trace (lookup.sanitize (c));
+ }
+
+ protected:
+ ArrayOf<HBUINT16>
+ backtrack; /* Array of backtracking values
+ * (to be matched before the input
+ * sequence) */
+ HeadlessArrayOf<HBUINT16>
+ inputX; /* Array of input values (start with
+ * second glyph) */
+ ArrayOf<HBUINT16>
+ 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
+{
+ bool intersects (const hb_set_t *glyphs, ChainContextClosureLookupContext &lookup_context) const
+ {
+ unsigned int num_rules = rule.len;
+ for (unsigned int i = 0; i < num_rules; i++)
+ if ((this+rule[i]).intersects (glyphs, lookup_context))
+ return true;
+ return false;
+ }
+ void closure (hb_closure_context_t *c, ChainContextClosureLookupContext &lookup_context) const
+ {
+ unsigned int num_rules = rule.len;
+ for (unsigned int i = 0; i < num_rules; i++)
+ (this+rule[i]).closure (c, lookup_context);
+ }
+
+ void collect_glyphs (hb_collect_glyphs_context_t *c, ChainContextCollectGlyphsLookupContext &lookup_context) const
+ {
+ unsigned int num_rules = rule.len;
+ for (unsigned int i = 0; i < num_rules; i++)
+ (this+rule[i]).collect_glyphs (c, lookup_context);
+ }
+
+ 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 (true);
+
+ return_trace (false);
+ }
+
+ bool apply (hb_ot_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 (true);
+
+ return_trace (false);
+ }
+
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (rule.sanitize (c, this));
+ }
+
+ protected:
+ OffsetArrayOf<ChainRule>
+ rule; /* Array of ChainRule tables
+ * ordered by preference */
+ public:
+ DEFINE_SIZE_ARRAY (2, rule);
+};
+
+struct ChainContextFormat1
+{
+ bool intersects (const hb_set_t *glyphs) const
+ {
+ struct ChainContextClosureLookupContext lookup_context = {
+ {intersects_glyph},
+ {nullptr, nullptr, nullptr}
+ };
+
+ unsigned int count = ruleSet.len;
+ for (Coverage::Iter iter (this+coverage); iter.more (); iter.next ())
+ {
+ if (unlikely (iter.get_coverage () >= count))
+ break; /* Work around malicious fonts. https://github.com/harfbuzz/harfbuzz/issues/363 */
+ if (glyphs->has (iter.get_glyph ()) &&
+ (this+ruleSet[iter.get_coverage ()]).intersects (glyphs, lookup_context))
+ return true;
+ }
+ return false;
+ }
+
+ void closure (hb_closure_context_t *c) const
+ {
+ struct ChainContextClosureLookupContext lookup_context = {
+ {intersects_glyph},
+ {nullptr, nullptr, nullptr}
+ };
+
+ unsigned int count = ruleSet.len;
+ for (Coverage::Iter iter (this+coverage); iter.more (); iter.next ())
+ {
+ if (unlikely (iter.get_coverage () >= count))
+ break; /* Work around malicious fonts. https://github.com/harfbuzz/harfbuzz/issues/363 */
+ if (c->glyphs->has (iter.get_glyph ()))
+ (this+ruleSet[iter.get_coverage ()]).closure (c, lookup_context);
+ }
+ }
+
+ void collect_glyphs (hb_collect_glyphs_context_t *c) const
+ {
+ (this+coverage).add_coverage (c->input);
+
+ struct ChainContextCollectGlyphsLookupContext lookup_context = {
+ {collect_glyph},
+ {nullptr, nullptr, nullptr}
+ };
+
+ unsigned int count = ruleSet.len;
+ for (unsigned int i = 0; i < count; i++)
+ (this+ruleSet[i]).collect_glyphs (c, lookup_context);
+ }
+
+ 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},
+ {nullptr, nullptr, nullptr}
+ };
+ return_trace (rule_set.would_apply (c, lookup_context));
+ }
+
+ const Coverage &get_coverage () const { return this+coverage; }
+
+ bool apply (hb_ot_apply_context_t *c) const
+ {
+ TRACE_APPLY (this);
+ unsigned int index = (this+coverage).get_coverage (c->buffer->cur().codepoint);
+ if (likely (index == NOT_COVERED)) return_trace (false);
+
+ const ChainRuleSet &rule_set = this+ruleSet[index];
+ struct ChainContextApplyLookupContext lookup_context = {
+ {match_glyph},
+ {nullptr, nullptr, nullptr}
+ };
+ return_trace (rule_set.apply (c, lookup_context));
+ }
+
+ bool subset (hb_subset_context_t *c) const
+ {
+ TRACE_SUBSET (this);
+ // TODO(subset)
+ return_trace (false);
+ }
+
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (coverage.sanitize (c, this) && ruleSet.sanitize (c, this));
+ }
+
+ protected:
+ HBUINT16 format; /* Format identifier--format = 1 */
+ 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
+{
+ bool intersects (const hb_set_t *glyphs) const
+ {
+ if (!(this+coverage).intersects (glyphs))
+ return false;
+
+ 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 (glyphs, i) &&
+ (this+ruleSet[i]).intersects (glyphs, lookup_context))
+ return true;
+
+ return false;
+ }
+ void closure (hb_closure_context_t *c) const
+ {
+ 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);
+ }
+ }
+
+ void collect_glyphs (hb_collect_glyphs_context_t *c) const
+ {
+ (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);
+ }
+
+ 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 (rule_set.would_apply (c, lookup_context));
+ }
+
+ const Coverage &get_coverage () const { return this+coverage; }
+
+ bool apply (hb_ot_apply_context_t *c) const
+ {
+ TRACE_APPLY (this);
+ unsigned int index = (this+coverage).get_coverage (c->buffer->cur().codepoint);
+ if (likely (index == NOT_COVERED)) return_trace (false);
+
+ const 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 (rule_set.apply (c, lookup_context));
+ }
+
+ bool subset (hb_subset_context_t *c) const
+ {
+ TRACE_SUBSET (this);
+ // TODO(subset)
+ return_trace (false);
+ }
+
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (coverage.sanitize (c, this) &&
+ backtrackClassDef.sanitize (c, this) &&
+ inputClassDef.sanitize (c, this) &&
+ lookaheadClassDef.sanitize (c, this) &&
+ ruleSet.sanitize (c, this));
+ }
+
+ protected:
+ HBUINT16 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
+{
+ bool intersects (const hb_set_t *glyphs) const
+ {
+ const OffsetArrayOf<Coverage> &input = StructAfter<OffsetArrayOf<Coverage> > (backtrack);
+
+ if (!(this+input[0]).intersects (glyphs))
+ return false;
+
+ const OffsetArrayOf<Coverage> &lookahead = StructAfter<OffsetArrayOf<Coverage> > (input);
+ struct ChainContextClosureLookupContext lookup_context = {
+ {intersects_coverage},
+ {this, this, this}
+ };
+ return chain_context_intersects (glyphs,
+ backtrack.len, (const HBUINT16 *) backtrack.arrayZ,
+ input.len, (const HBUINT16 *) input.arrayZ + 1,
+ lookahead.len, (const HBUINT16 *) lookahead.arrayZ,
+ lookup_context);
+ }
+
+ void closure (hb_closure_context_t *c) const
+ {
+ 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 HBUINT16 *) backtrack.arrayZ,
+ input.len, (const HBUINT16 *) input.arrayZ + 1,
+ lookahead.len, (const HBUINT16 *) lookahead.arrayZ,
+ lookup.len, lookup.arrayZ,
+ lookup_context);
+ }
+
+ void collect_glyphs (hb_collect_glyphs_context_t *c) const
+ {
+ 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 HBUINT16 *) backtrack.arrayZ,
+ input.len, (const HBUINT16 *) input.arrayZ + 1,
+ lookahead.len, (const HBUINT16 *) lookahead.arrayZ,
+ lookup.len, lookup.arrayZ,
+ lookup_context);
+ }
+
+ 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 (chain_context_would_apply_lookup (c,
+ backtrack.len, (const HBUINT16 *) backtrack.arrayZ,
+ input.len, (const HBUINT16 *) input.arrayZ + 1,
+ lookahead.len, (const HBUINT16 *) lookahead.arrayZ,
+ lookup.len, lookup.arrayZ, lookup_context));
+ }
+
+ const Coverage &get_coverage () const
+ {
+ const OffsetArrayOf<Coverage> &input = StructAfter<OffsetArrayOf<Coverage> > (backtrack);
+ return this+input[0];
+ }
+
+ bool apply (hb_ot_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 (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 (chain_context_apply_lookup (c,
+ backtrack.len, (const HBUINT16 *) backtrack.arrayZ,
+ input.len, (const HBUINT16 *) input.arrayZ + 1,
+ lookahead.len, (const HBUINT16 *) lookahead.arrayZ,
+ lookup.len, lookup.arrayZ, lookup_context));
+ }
+
+ bool subset (hb_subset_context_t *c) const
+ {
+ TRACE_SUBSET (this);
+ // TODO(subset)
+ return_trace (false);
+ }
+
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ if (!backtrack.sanitize (c, this)) return_trace (false);
+ const OffsetArrayOf<Coverage> &input = StructAfter<OffsetArrayOf<Coverage> > (backtrack);
+ if (!input.sanitize (c, this)) return_trace (false);
+ if (!input.len) return_trace (false); /* To be consistent with Context. */
+ const OffsetArrayOf<Coverage> &lookahead = StructAfter<OffsetArrayOf<Coverage> > (input);
+ if (!lookahead.sanitize (c, this)) return_trace (false);
+ const ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (lookahead);
+ return_trace (lookup.sanitize (c));
+ }
+
+ protected:
+ HBUINT16 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>
+ typename context_t::return_t dispatch (context_t *c) const
+ {
+ TRACE_DISPATCH (this, u.format);
+ if (unlikely (!c->may_dispatch (this, &u.format))) return_trace (c->no_dispatch_return_value ());
+ switch (u.format) {
+ case 1: return_trace (c->dispatch (u.format1));
+ case 2: return_trace (c->dispatch (u.format2));
+ case 3: return_trace (c->dispatch (u.format3));
+ default:return_trace (c->default_return_value ());
+ }
+ }
+
+ protected:
+ union {
+ HBUINT16 format; /* Format identifier */
+ ChainContextFormat1 format1;
+ ChainContextFormat2 format2;
+ ChainContextFormat3 format3;
+ } u;
+};
+
+
+template <typename T>
+struct ExtensionFormat1
+{
+ unsigned int get_type () const { return extensionLookupType; }
+
+ template <typename X>
+ const X& get_subtable () const
+ {
+ unsigned int offset = extensionOffset;
+ if (unlikely (!offset)) return Null(typename T::SubTable);
+ return StructAtOffset<typename T::SubTable> (this, offset);
+ }
+
+ template <typename context_t>
+ typename context_t::return_t dispatch (context_t *c) const
+ {
+ TRACE_DISPATCH (this, format);
+ if (unlikely (!c->may_dispatch (this, this))) return_trace (c->no_dispatch_return_value ());
+ return_trace (get_subtable<typename T::SubTable> ().dispatch (c, get_type ()));
+ }
+
+ /* This is called from may_dispatch() above with hb_sanitize_context_t. */
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this) &&
+ extensionOffset != 0 &&
+ extensionLookupType != T::SubTable::Extension);
+ }
+
+ protected:
+ HBUINT16 format; /* Format identifier. Set to 1. */
+ HBUINT16 extensionLookupType; /* Lookup type of subtable referenced
+ * by ExtensionOffset (i.e. the
+ * extension subtable). */
+ HBUINT32 extensionOffset; /* Offset to the extension subtable,
+ * of lookup type subtable. */
+ public:
+ DEFINE_SIZE_STATIC (8);
+};
+
+template <typename T>
+struct Extension
+{
+ unsigned int get_type () const
+ {
+ switch (u.format) {
+ case 1: return u.format1.get_type ();
+ default:return 0;
+ }
+ }
+ template <typename X>
+ const X& get_subtable () const
+ {
+ switch (u.format) {
+ case 1: return u.format1.template get_subtable<typename T::SubTable> ();
+ default:return Null(typename T::SubTable);
+ }
+ }
+
+ template <typename context_t>
+ typename context_t::return_t dispatch (context_t *c) const
+ {
+ TRACE_DISPATCH (this, u.format);
+ if (unlikely (!c->may_dispatch (this, &u.format))) return_trace (c->no_dispatch_return_value ());
+ switch (u.format) {
+ case 1: return_trace (u.format1.dispatch (c));
+ default:return_trace (c->default_return_value ());
+ }
+ }
+
+ protected:
+ union {
+ HBUINT16 format; /* Format identifier */
+ ExtensionFormat1<T> format1;
+ } u;
+};
+
+
+/*
+ * GSUB/GPOS Common
+ */
+
+struct hb_ot_layout_lookup_accelerator_t
+{
+ template <typename TLookup>
+ void init (const TLookup &lookup)
+ {
+ digest.init ();
+ lookup.add_coverage (&digest);
+
+ subtables.init ();
+ OT::hb_get_subtables_context_t c_get_subtables (subtables);
+ lookup.dispatch (&c_get_subtables);
+ }
+ void fini () { subtables.fini (); }
+
+ bool may_have (hb_codepoint_t g) const
+ { return digest.may_have (g); }
+
+ bool apply (hb_ot_apply_context_t *c) const
+ {
+ for (unsigned int i = 0; i < subtables.length; i++)
+ if (subtables[i].apply (c))
+ return true;
+ return false;
+ }
+
+ private:
+ hb_set_digest_t digest;
+ hb_get_subtables_context_t::array_t subtables;
+};
+
+struct GSUBGPOS
+{
+ bool has_data () const { return version.to_int (); }
+ unsigned int get_script_count () const
+ { return (this+scriptList).len; }
+ const Tag& get_script_tag (unsigned int i) const
+ { return (this+scriptList).get_tag (i); }
+ 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); }
+ const Script& get_script (unsigned int i) const
+ { return (this+scriptList)[i]; }
+ bool find_script_index (hb_tag_t tag, unsigned int *index) const
+ { return (this+scriptList).find_index (tag, index); }
+
+ unsigned int get_feature_count () const
+ { return (this+featureList).len; }
+ hb_tag_t get_feature_tag (unsigned int i) const
+ { return i == Index::NOT_FOUND_INDEX ? HB_TAG_NONE : (this+featureList).get_tag (i); }
+ 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); }
+ const Feature& get_feature (unsigned int i) const
+ { return (this+featureList)[i]; }
+ bool find_feature_index (hb_tag_t tag, unsigned int *index) const
+ { return (this+featureList).find_index (tag, index); }
+
+ unsigned int get_lookup_count () const
+ { return (this+lookupList).len; }
+ const Lookup& get_lookup (unsigned int i) const
+ { return (this+lookupList)[i]; }
+
+ bool find_variations_index (const int *coords, unsigned int num_coords,
+ unsigned int *index) const
+ { return (version.to_int () >= 0x00010001u ? this+featureVars : Null(FeatureVariations))
+ .find_index (coords, num_coords, index); }
+ const Feature& get_feature_variation (unsigned int feature_index,
+ unsigned int variations_index) const
+ {
+ if (FeatureVariations::NOT_FOUND_INDEX != variations_index &&
+ version.to_int () >= 0x00010001u)
+ {
+ const Feature *feature = (this+featureVars).find_substitute (variations_index,
+ feature_index);
+ if (feature)
+ return *feature;
+ }
+ return get_feature (feature_index);
+ }
+
+ template <typename TLookup>
+ bool subset (hb_subset_context_t *c) const
+ {
+ TRACE_SUBSET (this);
+ struct GSUBGPOS *out = c->serializer->embed (*this);
+ if (unlikely (!out)) return_trace (false);
+
+ out->scriptList.serialize_subset (c, this+scriptList, out);
+ out->featureList.serialize_subset (c, this+featureList, out);
+
+ typedef OffsetListOf<TLookup> TLookupList;
+ /* TODO Use intersects() to count how many subtables survive? */
+ CastR<OffsetTo<TLookupList> > (out->lookupList)
+ .serialize_subset (c,
+ this+CastR<const OffsetTo<TLookupList> > (lookupList),
+ out);
+
+ if (version.to_int () >= 0x00010001u)
+ out->featureVars.serialize_subset (c, this+featureVars, out);
+
+ return_trace (true);
+ }
+
+ unsigned int get_size () const
+ {
+ return min_size +
+ (version.to_int () >= 0x00010001u ? featureVars.static_size : 0);
+ }
+
+ template <typename TLookup>
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ typedef OffsetListOf<TLookup> TLookupList;
+ return_trace (version.sanitize (c) &&
+ likely (version.major == 1) &&
+ scriptList.sanitize (c, this) &&
+ featureList.sanitize (c, this) &&
+ CastR<OffsetTo<TLookupList> > (lookupList).sanitize (c, this) &&
+ (version.to_int () < 0x00010001u || featureVars.sanitize (c, this)));
+ }
+
+ template <typename T>
+ struct accelerator_t
+ {
+ void init (hb_face_t *face)
+ {
+ this->table = hb_sanitize_context_t().reference_table<T> (face);
+ if (unlikely (this->table->is_blacklisted (this->table.get_blob (), face)))
+ {
+ hb_blob_destroy (this->table.get_blob ());
+ this->table = hb_blob_get_empty ();
+ }
+
+ this->lookup_count = table->get_lookup_count ();
+
+ this->accels = (hb_ot_layout_lookup_accelerator_t *) calloc (this->lookup_count, sizeof (hb_ot_layout_lookup_accelerator_t));
+ if (unlikely (!this->accels))
+ this->lookup_count = 0;
+
+ for (unsigned int i = 0; i < this->lookup_count; i++)
+ this->accels[i].init (table->get_lookup (i));
+ }
+
+ void fini ()
+ {
+ for (unsigned int i = 0; i < this->lookup_count; i++)
+ this->accels[i].fini ();
+ free (this->accels);
+ this->table.destroy ();
+ }
+
+ hb_blob_ptr_t<T> table;
+ unsigned int lookup_count;
+ hb_ot_layout_lookup_accelerator_t *accels;
+ };
+
+ 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 */
+ LOffsetTo<FeatureVariations>
+ featureVars; /* Offset to Feature Variations
+ table--from beginning of table
+ * (may be NULL). Introduced
+ * in version 0x00010001. */
+ public:
+ DEFINE_SIZE_MIN (10);
+};
+
+
+} /* namespace OT */
+
+
+#endif /* HB_OT_LAYOUT_GSUBGPOS_HH */