2801 lines
90 KiB
C++
2801 lines
90 KiB
C++
/*
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* Copyright © 2007,2008,2009,2010 Red Hat, Inc.
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* Copyright © 2010,2012 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Behdad Esfahbod
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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef HB_OT_LAYOUT_GSUBGPOS_HH
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#define HB_OT_LAYOUT_GSUBGPOS_HH
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#include "hb.hh"
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#include "hb-buffer.hh"
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#include "hb-map.hh"
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#include "hb-set.hh"
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#include "hb-ot-map.hh"
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#include "hb-ot-layout-common.hh"
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#include "hb-ot-layout-gdef-table.hh"
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namespace OT {
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struct hb_intersects_context_t :
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hb_dispatch_context_t<hb_intersects_context_t, bool, 0>
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{
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inline const char *get_name (void) { return "INTERSECTS"; }
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template <typename T>
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inline return_t dispatch (const T &obj) { return obj.intersects (this->glyphs); }
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static return_t default_return_value (void) { return false; }
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bool stop_sublookup_iteration (return_t r) const { return r; }
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const hb_set_t *glyphs;
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unsigned int debug_depth;
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hb_intersects_context_t (const hb_set_t *glyphs_) :
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glyphs (glyphs_),
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debug_depth (0) {}
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};
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struct hb_closure_context_t :
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hb_dispatch_context_t<hb_closure_context_t, hb_void_t, HB_DEBUG_CLOSURE>
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{
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inline const char *get_name (void) { return "CLOSURE"; }
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typedef return_t (*recurse_func_t) (hb_closure_context_t *c, unsigned int lookup_index);
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template <typename T>
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inline return_t dispatch (const T &obj) { obj.closure (this); return HB_VOID; }
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static return_t default_return_value (void) { return HB_VOID; }
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bool stop_sublookup_iteration (return_t r HB_UNUSED) const { return false; }
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void recurse (unsigned int lookup_index)
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{
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if (unlikely (nesting_level_left == 0 || !recurse_func))
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return;
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nesting_level_left--;
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recurse_func (this, lookup_index);
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nesting_level_left++;
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}
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bool should_visit_lookup (unsigned int lookup_index)
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{
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if (is_lookup_done (lookup_index))
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return false;
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done_lookups->set (lookup_index, glyphs->get_population ());
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return true;
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}
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bool is_lookup_done (unsigned int lookup_index)
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{
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/* Have we visited this lookup with the current set of glyphs? */
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return done_lookups->get (lookup_index) == glyphs->get_population ();
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}
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hb_face_t *face;
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hb_set_t *glyphs;
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hb_auto_t<hb_set_t> out[1];
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recurse_func_t recurse_func;
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unsigned int nesting_level_left;
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unsigned int debug_depth;
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hb_closure_context_t (hb_face_t *face_,
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hb_set_t *glyphs_,
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hb_map_t *done_lookups_,
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unsigned int nesting_level_left_ = HB_MAX_NESTING_LEVEL) :
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face (face_),
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glyphs (glyphs_),
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recurse_func (nullptr),
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nesting_level_left (nesting_level_left_),
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debug_depth (0),
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done_lookups (done_lookups_) {}
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~hb_closure_context_t (void)
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{
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flush ();
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}
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void set_recurse_func (recurse_func_t func) { recurse_func = func; }
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void flush (void)
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{
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hb_set_union (glyphs, out);
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hb_set_clear (out);
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}
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private:
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hb_map_t *done_lookups;
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};
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struct hb_would_apply_context_t :
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hb_dispatch_context_t<hb_would_apply_context_t, bool, HB_DEBUG_WOULD_APPLY>
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{
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inline const char *get_name (void) { return "WOULD_APPLY"; }
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template <typename T>
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inline return_t dispatch (const T &obj) { return obj.would_apply (this); }
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static return_t default_return_value (void) { return false; }
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bool stop_sublookup_iteration (return_t r) const { return r; }
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hb_face_t *face;
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const hb_codepoint_t *glyphs;
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unsigned int len;
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bool zero_context;
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unsigned int debug_depth;
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hb_would_apply_context_t (hb_face_t *face_,
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const hb_codepoint_t *glyphs_,
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unsigned int len_,
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bool zero_context_) :
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face (face_),
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glyphs (glyphs_),
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len (len_),
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zero_context (zero_context_),
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debug_depth (0) {}
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};
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struct hb_collect_glyphs_context_t :
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hb_dispatch_context_t<hb_collect_glyphs_context_t, hb_void_t, HB_DEBUG_COLLECT_GLYPHS>
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{
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inline const char *get_name (void) { return "COLLECT_GLYPHS"; }
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typedef return_t (*recurse_func_t) (hb_collect_glyphs_context_t *c, unsigned int lookup_index);
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template <typename T>
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inline return_t dispatch (const T &obj) { obj.collect_glyphs (this); return HB_VOID; }
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static return_t default_return_value (void) { return HB_VOID; }
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bool stop_sublookup_iteration (return_t r HB_UNUSED) const { return false; }
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void recurse (unsigned int lookup_index)
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{
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if (unlikely (nesting_level_left == 0 || !recurse_func))
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return;
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/* Note that GPOS sets recurse_func to nullptr already, so it doesn't get
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* past the previous check. For GSUB, we only want to collect the output
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* glyphs in the recursion. If output is not requested, we can go home now.
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*
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* Note further, that the above is not exactly correct. A recursed lookup
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* is allowed to match input that is not matched in the context, but that's
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* not how most fonts are built. It's possible to relax that and recurse
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* with all sets here if it proves to be an issue.
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*/
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if (output == hb_set_get_empty ())
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return;
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/* Return if new lookup was recursed to before. */
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if (recursed_lookups->has (lookup_index))
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return;
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hb_set_t *old_before = before;
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hb_set_t *old_input = input;
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hb_set_t *old_after = after;
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before = input = after = hb_set_get_empty ();
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nesting_level_left--;
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recurse_func (this, lookup_index);
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nesting_level_left++;
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before = old_before;
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input = old_input;
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after = old_after;
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recursed_lookups->add (lookup_index);
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}
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hb_face_t *face;
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hb_set_t *before;
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hb_set_t *input;
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hb_set_t *after;
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hb_set_t *output;
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recurse_func_t recurse_func;
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hb_set_t *recursed_lookups;
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unsigned int nesting_level_left;
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unsigned int debug_depth;
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hb_collect_glyphs_context_t (hb_face_t *face_,
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hb_set_t *glyphs_before, /* OUT. May be NULL */
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hb_set_t *glyphs_input, /* OUT. May be NULL */
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hb_set_t *glyphs_after, /* OUT. May be NULL */
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hb_set_t *glyphs_output, /* OUT. May be NULL */
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unsigned int nesting_level_left_ = HB_MAX_NESTING_LEVEL) :
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face (face_),
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before (glyphs_before ? glyphs_before : hb_set_get_empty ()),
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input (glyphs_input ? glyphs_input : hb_set_get_empty ()),
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after (glyphs_after ? glyphs_after : hb_set_get_empty ()),
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output (glyphs_output ? glyphs_output : hb_set_get_empty ()),
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recurse_func (nullptr),
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recursed_lookups (hb_set_create ()),
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nesting_level_left (nesting_level_left_),
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debug_depth (0) {}
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~hb_collect_glyphs_context_t (void) { hb_set_destroy (recursed_lookups); }
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void set_recurse_func (recurse_func_t func) { recurse_func = func; }
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};
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template <typename set_t>
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struct hb_add_coverage_context_t :
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hb_dispatch_context_t<hb_add_coverage_context_t<set_t>, const Coverage &, HB_DEBUG_GET_COVERAGE>
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{
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inline const char *get_name (void) { return "GET_COVERAGE"; }
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typedef const Coverage &return_t;
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template <typename T>
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inline return_t dispatch (const T &obj) { return obj.get_coverage (); }
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static return_t default_return_value (void) { return Null(Coverage); }
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bool stop_sublookup_iteration (return_t r) const
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{
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r.add_coverage (set);
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return false;
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}
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hb_add_coverage_context_t (set_t *set_) :
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set (set_),
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debug_depth (0) {}
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set_t *set;
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unsigned int debug_depth;
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};
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struct hb_ot_apply_context_t :
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hb_dispatch_context_t<hb_ot_apply_context_t, bool, HB_DEBUG_APPLY>
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{
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struct matcher_t
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{
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inline matcher_t (void) :
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lookup_props (0),
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ignore_zwnj (false),
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ignore_zwj (false),
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mask (-1),
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#define arg1(arg) (arg) /* Remove the macro to see why it's needed! */
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syllable arg1(0),
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#undef arg1
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match_func (nullptr),
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match_data (nullptr) {};
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typedef bool (*match_func_t) (hb_codepoint_t glyph_id, const HBUINT16 &value, const void *data);
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inline void set_ignore_zwnj (bool ignore_zwnj_) { ignore_zwnj = ignore_zwnj_; }
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inline void set_ignore_zwj (bool ignore_zwj_) { ignore_zwj = ignore_zwj_; }
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inline void set_lookup_props (unsigned int lookup_props_) { lookup_props = lookup_props_; }
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inline void set_mask (hb_mask_t mask_) { mask = mask_; }
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inline void set_syllable (uint8_t syllable_) { syllable = syllable_; }
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inline void set_match_func (match_func_t match_func_,
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const void *match_data_)
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{ match_func = match_func_; match_data = match_data_; }
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enum may_match_t {
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MATCH_NO,
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MATCH_YES,
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MATCH_MAYBE
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};
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inline may_match_t may_match (const hb_glyph_info_t &info,
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const HBUINT16 *glyph_data) const
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{
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if (!(info.mask & mask) ||
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(syllable && syllable != info.syllable ()))
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return MATCH_NO;
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if (match_func)
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return match_func (info.codepoint, *glyph_data, match_data) ? MATCH_YES : MATCH_NO;
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return MATCH_MAYBE;
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}
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enum may_skip_t {
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SKIP_NO,
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SKIP_YES,
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SKIP_MAYBE
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};
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inline may_skip_t
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may_skip (const hb_ot_apply_context_t *c,
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const hb_glyph_info_t &info) const
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{
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if (!c->check_glyph_property (&info, lookup_props))
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return SKIP_YES;
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if (unlikely (_hb_glyph_info_is_default_ignorable_and_not_hidden (&info) &&
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(ignore_zwnj || !_hb_glyph_info_is_zwnj (&info)) &&
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(ignore_zwj || !_hb_glyph_info_is_zwj (&info))))
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return SKIP_MAYBE;
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return SKIP_NO;
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}
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protected:
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unsigned int lookup_props;
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bool ignore_zwnj;
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bool ignore_zwj;
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hb_mask_t mask;
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uint8_t syllable;
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match_func_t match_func;
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const void *match_data;
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};
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struct skipping_iterator_t
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{
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inline void init (hb_ot_apply_context_t *c_, bool context_match = false)
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{
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c = c_;
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match_glyph_data = nullptr;
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matcher.set_match_func (nullptr, nullptr);
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matcher.set_lookup_props (c->lookup_props);
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/* Ignore ZWNJ if we are matching GPOS, or matching GSUB context and asked to. */
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matcher.set_ignore_zwnj (c->table_index == 1 || (context_match && c->auto_zwnj));
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/* Ignore ZWJ if we are matching context, or asked to. */
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matcher.set_ignore_zwj (context_match || c->auto_zwj);
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matcher.set_mask (context_match ? -1 : c->lookup_mask);
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}
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inline void set_lookup_props (unsigned int lookup_props)
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{
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matcher.set_lookup_props (lookup_props);
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}
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inline void set_match_func (matcher_t::match_func_t match_func_,
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const void *match_data_,
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const HBUINT16 glyph_data[])
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{
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matcher.set_match_func (match_func_, match_data_);
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match_glyph_data = glyph_data;
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}
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inline void reset (unsigned int start_index_,
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unsigned int num_items_)
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{
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idx = start_index_;
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num_items = num_items_;
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end = c->buffer->len;
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matcher.set_syllable (start_index_ == c->buffer->idx ? c->buffer->cur().syllable () : 0);
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}
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inline void reject (void) { num_items++; match_glyph_data--; }
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inline matcher_t::may_skip_t
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may_skip (const hb_glyph_info_t &info) const
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{
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return matcher.may_skip (c, info);
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}
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inline bool next (void)
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{
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assert (num_items > 0);
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while (idx + num_items < end)
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{
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idx++;
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const hb_glyph_info_t &info = c->buffer->info[idx];
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matcher_t::may_skip_t skip = matcher.may_skip (c, info);
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if (unlikely (skip == matcher_t::SKIP_YES))
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continue;
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matcher_t::may_match_t match = matcher.may_match (info, match_glyph_data);
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if (match == matcher_t::MATCH_YES ||
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(match == matcher_t::MATCH_MAYBE &&
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skip == matcher_t::SKIP_NO))
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{
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num_items--;
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match_glyph_data++;
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return true;
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}
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if (skip == matcher_t::SKIP_NO)
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return false;
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}
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return false;
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}
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inline bool prev (void)
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{
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assert (num_items > 0);
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while (idx > num_items - 1)
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{
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idx--;
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const hb_glyph_info_t &info = c->buffer->out_info[idx];
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matcher_t::may_skip_t skip = matcher.may_skip (c, info);
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if (unlikely (skip == matcher_t::SKIP_YES))
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continue;
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matcher_t::may_match_t match = matcher.may_match (info, match_glyph_data);
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if (match == matcher_t::MATCH_YES ||
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(match == matcher_t::MATCH_MAYBE &&
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skip == matcher_t::SKIP_NO))
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{
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num_items--;
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match_glyph_data++;
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return true;
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}
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if (skip == matcher_t::SKIP_NO)
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return false;
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}
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return false;
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}
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unsigned int idx;
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protected:
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hb_ot_apply_context_t *c;
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matcher_t matcher;
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const HBUINT16 *match_glyph_data;
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unsigned int num_items;
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unsigned int end;
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};
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inline const char *get_name (void) { return "APPLY"; }
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typedef return_t (*recurse_func_t) (hb_ot_apply_context_t *c, unsigned int lookup_index);
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template <typename T>
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inline return_t dispatch (const T &obj) { return obj.apply (this); }
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static return_t default_return_value (void) { return false; }
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bool stop_sublookup_iteration (return_t r) const { return r; }
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return_t recurse (unsigned int sub_lookup_index)
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{
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if (unlikely (nesting_level_left == 0 || !recurse_func || buffer->max_ops-- <= 0))
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return default_return_value ();
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nesting_level_left--;
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bool ret = recurse_func (this, sub_lookup_index);
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nesting_level_left++;
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return ret;
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}
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skipping_iterator_t iter_input, iter_context;
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hb_font_t *font;
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hb_face_t *face;
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hb_buffer_t *buffer;
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recurse_func_t recurse_func;
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const GDEF &gdef;
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const VariationStore &var_store;
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hb_direction_t direction;
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hb_mask_t lookup_mask;
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unsigned int table_index; /* GSUB/GPOS */
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unsigned int lookup_index;
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unsigned int lookup_props;
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unsigned int nesting_level_left;
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unsigned int debug_depth;
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bool has_glyph_classes;
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bool auto_zwnj;
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bool auto_zwj;
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bool random;
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uint32_t random_state;
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hb_ot_apply_context_t (unsigned int table_index_,
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hb_font_t *font_,
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|
hb_buffer_t *buffer_) :
|
|
iter_input (), iter_context (),
|
|
font (font_), face (font->face), buffer (buffer_),
|
|
recurse_func (nullptr),
|
|
gdef (_get_gdef (face)),
|
|
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 (); }
|
|
|
|
inline void init_iters (void)
|
|
{
|
|
iter_input.init (this, false);
|
|
iter_context.init (this, true);
|
|
}
|
|
|
|
inline void set_lookup_mask (hb_mask_t mask) { lookup_mask = mask; init_iters (); }
|
|
inline void set_auto_zwj (bool auto_zwj_) { auto_zwj = auto_zwj_; init_iters (); }
|
|
inline void set_auto_zwnj (bool auto_zwnj_) { auto_zwnj = auto_zwnj_; init_iters (); }
|
|
inline void set_random (bool random_) { random = random_; }
|
|
inline void set_recurse_func (recurse_func_t func) { recurse_func = func; }
|
|
inline void set_lookup_index (unsigned int lookup_index_) { lookup_index = lookup_index_; }
|
|
inline void set_lookup_props (unsigned int lookup_props_) { lookup_props = lookup_props_; init_iters (); }
|
|
|
|
inline uint32_t random_number (void)
|
|
{
|
|
/* http://www.cplusplus.com/reference/random/minstd_rand/ */
|
|
random_state = random_state * 48271 % 2147483647;
|
|
return random_state;
|
|
}
|
|
|
|
inline 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;
|
|
}
|
|
|
|
inline 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;
|
|
}
|
|
|
|
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 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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
};
|
|
|
|
|
|
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 inline bool apply_to (const void *obj, OT::hb_ot_apply_context_t *c)
|
|
{
|
|
const Type *typed_obj = (const Type *) obj;
|
|
return typed_obj->apply (c);
|
|
}
|
|
|
|
typedef bool (*hb_apply_func_t) (const void *obj, OT::hb_ot_apply_context_t *c);
|
|
|
|
struct hb_applicable_t
|
|
{
|
|
template <typename T>
|
|
inline 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);
|
|
}
|
|
|
|
inline 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, 2> array_t;
|
|
|
|
/* Dispatch interface. */
|
|
inline const char *get_name (void) { return "GET_SUBTABLES"; }
|
|
template <typename T>
|
|
inline 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 (void) { return HB_VOID; }
|
|
bool stop_sublookup_iteration (return_t r HB_UNUSED) const { return false; }
|
|
|
|
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
|
|
{
|
|
inline 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
|
|
{
|
|
inline bool intersects (const hb_set_t *glyphs, ContextClosureLookupContext &lookup_context) const
|
|
{
|
|
return context_intersects (glyphs,
|
|
inputCount, inputZ.arrayZ,
|
|
lookup_context);
|
|
}
|
|
|
|
inline void closure (hb_closure_context_t *c, ContextClosureLookupContext &lookup_context) const
|
|
{
|
|
TRACE_CLOSURE (this);
|
|
const UnsizedArrayOf<LookupRecord> &lookupRecord = StructAtOffset<UnsizedArrayOf<LookupRecord> > (inputZ.arrayZ, inputZ[0].static_size * (inputCount ? inputCount - 1 : 0));
|
|
context_closure_lookup (c,
|
|
inputCount, inputZ.arrayZ,
|
|
lookupCount, lookupRecord.arrayZ,
|
|
lookup_context);
|
|
}
|
|
|
|
inline void collect_glyphs (hb_collect_glyphs_context_t *c, ContextCollectGlyphsLookupContext &lookup_context) const
|
|
{
|
|
TRACE_COLLECT_GLYPHS (this);
|
|
const UnsizedArrayOf<LookupRecord> &lookupRecord = StructAtOffset<UnsizedArrayOf<LookupRecord> > (inputZ.arrayZ, inputZ[0].static_size * (inputCount ? inputCount - 1 : 0));
|
|
context_collect_glyphs_lookup (c,
|
|
inputCount, inputZ.arrayZ,
|
|
lookupCount, lookupRecord.arrayZ,
|
|
lookup_context);
|
|
}
|
|
|
|
inline bool would_apply (hb_would_apply_context_t *c, ContextApplyLookupContext &lookup_context) const
|
|
{
|
|
TRACE_WOULD_APPLY (this);
|
|
const UnsizedArrayOf<LookupRecord> &lookupRecord = StructAtOffset<UnsizedArrayOf<LookupRecord> > (inputZ.arrayZ, inputZ[0].static_size * (inputCount ? inputCount - 1 : 0));
|
|
return_trace (context_would_apply_lookup (c, inputCount, inputZ.arrayZ, lookupCount, lookupRecord.arrayZ, lookup_context));
|
|
}
|
|
|
|
inline bool apply (hb_ot_apply_context_t *c, ContextApplyLookupContext &lookup_context) const
|
|
{
|
|
TRACE_APPLY (this);
|
|
const UnsizedArrayOf<LookupRecord> &lookupRecord = StructAtOffset<UnsizedArrayOf<LookupRecord> > (inputZ.arrayZ, inputZ[0].static_size * (inputCount ? inputCount - 1 : 0));
|
|
return_trace (context_apply_lookup (c, inputCount, inputZ.arrayZ, lookupCount, lookupRecord.arrayZ, lookup_context));
|
|
}
|
|
|
|
public:
|
|
inline 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[0].static_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
|
|
{
|
|
inline 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;
|
|
}
|
|
|
|
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 (true);
|
|
}
|
|
return_trace (false);
|
|
}
|
|
|
|
inline 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);
|
|
}
|
|
|
|
inline 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
|
|
{
|
|
inline bool intersects (const hb_set_t *glyphs) const
|
|
{
|
|
struct ContextClosureLookupContext lookup_context = {
|
|
{intersects_glyph},
|
|
nullptr
|
|
};
|
|
|
|
unsigned int count = ruleSet.len;
|
|
for (hb_auto_t<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;
|
|
}
|
|
|
|
inline void closure (hb_closure_context_t *c) const
|
|
{
|
|
TRACE_CLOSURE (this);
|
|
|
|
struct ContextClosureLookupContext lookup_context = {
|
|
{intersects_glyph},
|
|
nullptr
|
|
};
|
|
|
|
unsigned int count = ruleSet.len;
|
|
for (hb_auto_t<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);
|
|
}
|
|
}
|
|
|
|
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},
|
|
nullptr
|
|
};
|
|
|
|
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},
|
|
nullptr
|
|
};
|
|
return_trace (rule_set.would_apply (c, lookup_context));
|
|
}
|
|
|
|
inline const Coverage &get_coverage (void) const
|
|
{ return this+coverage; }
|
|
|
|
inline 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));
|
|
}
|
|
|
|
inline bool subset (hb_subset_context_t *c) const
|
|
{
|
|
TRACE_SUBSET (this);
|
|
// TODO(subset)
|
|
return_trace (false);
|
|
}
|
|
|
|
inline 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
|
|
{
|
|
inline 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;
|
|
}
|
|
|
|
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 (rule_set.would_apply (c, lookup_context));
|
|
}
|
|
|
|
inline const Coverage &get_coverage (void) const
|
|
{ return this+coverage; }
|
|
|
|
inline 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));
|
|
}
|
|
|
|
inline bool subset (hb_subset_context_t *c) const
|
|
{
|
|
TRACE_SUBSET (this);
|
|
// TODO(subset)
|
|
return_trace (false);
|
|
}
|
|
|
|
inline 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
|
|
{
|
|
inline 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);
|
|
}
|
|
|
|
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.arrayZ, coverageZ[0].static_size * glyphCount);
|
|
struct ContextClosureLookupContext lookup_context = {
|
|
{intersects_coverage},
|
|
this
|
|
};
|
|
context_closure_lookup (c,
|
|
glyphCount, (const HBUINT16 *) (coverageZ.arrayZ + 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.arrayZ, coverageZ[0].static_size * glyphCount);
|
|
struct ContextCollectGlyphsLookupContext lookup_context = {
|
|
{collect_coverage},
|
|
this
|
|
};
|
|
|
|
context_collect_glyphs_lookup (c,
|
|
glyphCount, (const HBUINT16 *) (coverageZ.arrayZ + 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.arrayZ, coverageZ[0].static_size * 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));
|
|
}
|
|
|
|
inline const Coverage &get_coverage (void) const
|
|
{ return this+coverageZ[0]; }
|
|
|
|
inline 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 = &StructAtOffset<LookupRecord> (coverageZ.arrayZ, coverageZ[0].static_size * glyphCount);
|
|
struct ContextApplyLookupContext lookup_context = {
|
|
{match_coverage},
|
|
this
|
|
};
|
|
return_trace (context_apply_lookup (c, glyphCount, (const HBUINT16 *) (coverageZ.arrayZ + 1), lookupCount, lookupRecord, lookup_context));
|
|
}
|
|
|
|
inline bool subset (hb_subset_context_t *c) const
|
|
{
|
|
TRACE_SUBSET (this);
|
|
// TODO(subset)
|
|
return_trace (false);
|
|
}
|
|
|
|
inline 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 = &StructAtOffset<LookupRecord> (coverageZ.arrayZ, coverageZ[0].static_size * count);
|
|
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>
|
|
inline 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
|
|
{
|
|
inline 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);
|
|
}
|
|
|
|
inline void closure (hb_closure_context_t *c, ChainContextClosureLookupContext &lookup_context) const
|
|
{
|
|
TRACE_CLOSURE (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);
|
|
chain_context_closure_lookup (c,
|
|
backtrack.len, backtrack.arrayZ,
|
|
input.lenP1, input.arrayZ,
|
|
lookahead.len, lookahead.arrayZ,
|
|
lookup.len, lookup.arrayZ,
|
|
lookup_context);
|
|
}
|
|
|
|
inline void collect_glyphs (hb_collect_glyphs_context_t *c, ChainContextCollectGlyphsLookupContext &lookup_context) const
|
|
{
|
|
TRACE_COLLECT_GLYPHS (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);
|
|
chain_context_collect_glyphs_lookup (c,
|
|
backtrack.len, backtrack.arrayZ,
|
|
input.lenP1, input.arrayZ,
|
|
lookahead.len, lookahead.arrayZ,
|
|
lookup.len, lookup.arrayZ,
|
|
lookup_context);
|
|
}
|
|
|
|
inline 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));
|
|
}
|
|
|
|
inline 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));
|
|
}
|
|
|
|
inline 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
|
|
{
|
|
inline 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;
|
|
}
|
|
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 (true);
|
|
|
|
return_trace (false);
|
|
}
|
|
|
|
inline 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);
|
|
}
|
|
|
|
inline 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
|
|
{
|
|
inline bool intersects (const hb_set_t *glyphs) const
|
|
{
|
|
struct ChainContextClosureLookupContext lookup_context = {
|
|
{intersects_glyph},
|
|
{nullptr, nullptr, nullptr}
|
|
};
|
|
|
|
unsigned int count = ruleSet.len;
|
|
for (hb_auto_t<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;
|
|
}
|
|
|
|
inline void closure (hb_closure_context_t *c) const
|
|
{
|
|
TRACE_CLOSURE (this);
|
|
|
|
struct ChainContextClosureLookupContext lookup_context = {
|
|
{intersects_glyph},
|
|
{nullptr, nullptr, nullptr}
|
|
};
|
|
|
|
unsigned int count = ruleSet.len;
|
|
for (hb_auto_t<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);
|
|
}
|
|
}
|
|
|
|
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},
|
|
{nullptr, nullptr, nullptr}
|
|
};
|
|
|
|
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},
|
|
{nullptr, nullptr, nullptr}
|
|
};
|
|
return_trace (rule_set.would_apply (c, lookup_context));
|
|
}
|
|
|
|
inline const Coverage &get_coverage (void) const
|
|
{ return this+coverage; }
|
|
|
|
inline 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));
|
|
}
|
|
|
|
inline bool subset (hb_subset_context_t *c) const
|
|
{
|
|
TRACE_SUBSET (this);
|
|
// TODO(subset)
|
|
return_trace (false);
|
|
}
|
|
|
|
inline 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
|
|
{
|
|
inline 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;
|
|
}
|
|
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 (rule_set.would_apply (c, lookup_context));
|
|
}
|
|
|
|
inline const Coverage &get_coverage (void) const
|
|
{ return this+coverage; }
|
|
|
|
inline 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));
|
|
}
|
|
|
|
inline bool subset (hb_subset_context_t *c) const
|
|
{
|
|
TRACE_SUBSET (this);
|
|
// TODO(subset)
|
|
return_trace (false);
|
|
}
|
|
|
|
inline 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
|
|
{
|
|
inline 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);
|
|
}
|
|
|
|
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 HBUINT16 *) backtrack.arrayZ,
|
|
input.len, (const HBUINT16 *) input.arrayZ + 1,
|
|
lookahead.len, (const HBUINT16 *) lookahead.arrayZ,
|
|
lookup.len, lookup.arrayZ,
|
|
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 HBUINT16 *) backtrack.arrayZ,
|
|
input.len, (const HBUINT16 *) input.arrayZ + 1,
|
|
lookahead.len, (const HBUINT16 *) lookahead.arrayZ,
|
|
lookup.len, lookup.arrayZ,
|
|
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 (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));
|
|
}
|
|
|
|
inline const Coverage &get_coverage (void) const
|
|
{
|
|
const OffsetArrayOf<Coverage> &input = StructAfter<OffsetArrayOf<Coverage> > (backtrack);
|
|
return this+input[0];
|
|
}
|
|
|
|
inline 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));
|
|
}
|
|
|
|
inline bool subset (hb_subset_context_t *c) const
|
|
{
|
|
TRACE_SUBSET (this);
|
|
// TODO(subset)
|
|
return_trace (false);
|
|
}
|
|
|
|
inline 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>
|
|
inline 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
|
|
{
|
|
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::SubTable);
|
|
return StructAtOffset<typename T::SubTable> (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))) 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. */
|
|
inline 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
|
|
{
|
|
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::SubTable> ();
|
|
default:return Null(typename T::SubTable);
|
|
}
|
|
}
|
|
|
|
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))) 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>
|
|
inline 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);
|
|
}
|
|
inline void fini (void)
|
|
{
|
|
subtables.fini ();
|
|
}
|
|
|
|
inline bool may_have (hb_codepoint_t g) const
|
|
{ return digest.may_have (g); }
|
|
|
|
inline bool apply (hb_ot_apply_context_t *c) const
|
|
{
|
|
for (unsigned int i = 0; i < subtables.len; 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
|
|
{
|
|
inline bool has_data (void) const { return version.to_int () != 0; }
|
|
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 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); }
|
|
inline 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>
|
|
inline 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);
|
|
}
|
|
|
|
inline unsigned int get_size (void) const
|
|
{
|
|
return min_size +
|
|
(version.to_int () >= 0x00010001u ? featureVars.static_size : 0);
|
|
}
|
|
|
|
template <typename TLookup>
|
|
inline 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
|
|
{
|
|
inline void init (hb_face_t *face)
|
|
{
|
|
this->blob = hb_sanitize_context_t().reference_table<T> (face);
|
|
table = this->blob->template as<T> ();
|
|
|
|
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));
|
|
}
|
|
|
|
inline void fini (void)
|
|
{
|
|
for (unsigned int i = 0; i < this->lookup_count; i++)
|
|
this->accels[i].fini ();
|
|
free (this->accels);
|
|
hb_blob_destroy (this->blob);
|
|
}
|
|
|
|
hb_blob_t *blob;
|
|
const 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 */
|