kc3-lang/harfbuzz/src/hb-ot-layout-gsub-table.hh

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• Hash : 22545743
  Author :
  Date : 2025-08-20T00:06:00
  

  Match positions no malloc (#5481)
  
  * Reduce allocation of match_positions by caching one in ctx
  
  * Use a stack-array for small match-positions
  
  This surgically enables stack-backed storage in vector.
  
  * Handle match-positions alloc failure
  
  And make allocations unchecked.
  
  * Clean up CFF hack to use static storage in vector
  
  * Fixup for match_positions allocations
  
  * Fix vector handling of foreign arrays memory management

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• src/hb-ot-layout-gsub-table.hh

• /*
   * Copyright © 2007,2008,2009,2010  Red Hat, Inc.
   * Copyright © 2010,2012,2013  Google, Inc.
   *
   *  This is part of HarfBuzz, a text shaping library.
   *
   * Permission is hereby granted, without written agreement and without
   * license or royalty fees, to use, copy, modify, and distribute this
   * software and its documentation for any purpose, provided that the
   * above copyright notice and the following two paragraphs appear in
   * all copies of this software.
   *
   * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
   * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
   * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
   * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
   * DAMAGE.
   *
   * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
   * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
   * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
   * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
   * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
   *
   * Red Hat Author(s): Behdad Esfahbod
   * Google Author(s): Behdad Esfahbod
   */
  
  #ifndef HB_OT_LAYOUT_GSUB_TABLE_HH
  #define HB_OT_LAYOUT_GSUB_TABLE_HH
  
  #include "OT/Layout/GSUB/GSUB.hh"
  
  namespace OT {
  namespace Layout {
  namespace GSUB_impl {
  
  // TODO(garretrieger): Move into the new layout directory.
  /* Out-of-class implementation for methods recursing */
  
  #ifndef HB_NO_OT_LAYOUT
  /*static*/ inline bool ExtensionSubst::is_reverse () const
  {
    return SubstLookup::lookup_type_is_reverse (get_type ());
  }
  template <typename context_t>
  /*static*/ typename context_t::return_t SubstLookup::dispatch_recurse_func (context_t *c, unsigned int lookup_index)
  {
    const SubstLookup &l = c->face->table.GSUB.get_relaxed ()->table->get_lookup (lookup_index);
    return l.dispatch (c);
  }
  
  /*static*/ typename hb_closure_context_t::return_t SubstLookup::closure_glyphs_recurse_func (hb_closure_context_t *c, unsigned lookup_index, hb_set_t *covered_seq_indices, unsigned seq_index, unsigned end_index)
  {
    const SubstLookup &l = c->face->table.GSUB.get_relaxed ()->table->get_lookup (lookup_index);
    if (l.may_have_non_1to1 ())
        hb_set_add_range (covered_seq_indices, seq_index, end_index);
    return l.dispatch (c);
  }
  
  template <>
  inline hb_closure_lookups_context_t::return_t
  SubstLookup::dispatch_recurse_func<hb_closure_lookups_context_t> (hb_closure_lookups_context_t *c, unsigned this_index)
  {
    const SubstLookup &l = c->face->table.GSUB.get_relaxed ()->table->get_lookup (this_index);
    return l.closure_lookups (c, this_index);
  }
  
  template <>
  inline bool SubstLookup::dispatch_recurse_func<hb_ot_apply_context_t> (hb_ot_apply_context_t *c, unsigned int lookup_index)
  {
    auto *gsub = c->face->table.GSUB.get_relaxed ();
    const SubstLookup &l = gsub->table->get_lookup (lookup_index);
    unsigned int saved_lookup_props = c->lookup_props;
    unsigned int saved_lookup_index = c->lookup_index;
    c->set_lookup_index (lookup_index);
    c->set_lookup_props (l.get_props ());
  
    uint32_t stack_match_positions[8];
    hb_vector_t<uint32_t> saved_match_positions;
    saved_match_positions.set_storage (stack_match_positions);
    hb_swap (c->match_positions, saved_match_positions);
  
    bool ret = false;
    auto *accel = gsub->get_accel (lookup_index);
    ret = accel && accel->apply (c, false);
  
    c->set_lookup_index (saved_lookup_index);
    c->set_lookup_props (saved_lookup_props);
  
    hb_swap (c->match_positions, saved_match_positions);
  
    return ret;
  }
  #endif
  
  } /* namespace GSUB_impl */
  } /* namespace Layout */
  } /* namespace OT */
  
  
  #endif /* HB_OT_LAYOUT_GSUB_TABLE_HH */
  

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