kc3-lang/harfbuzz/src/OT/Layout/GPOS/LigatureArray.hh

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• Hash : 7989702a
  Author :
  Date : 2023-08-06T14:17:50
  

  Audit and fix up serialize_subset uses
  
  Fixes https://github.com/harfbuzz/harfbuzz/issues/4362
  

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• src/OT/Layout/GPOS/LigatureArray.hh

• #ifndef OT_LAYOUT_GPOS_LIGATUREARRAY_HH
  #define OT_LAYOUT_GPOS_LIGATUREARRAY_HH
  
  namespace OT {
  namespace Layout {
  namespace GPOS_impl {
  
  
  typedef AnchorMatrix LigatureAttach;    /* component-major--
                                           * in order of writing direction--,
                                           * mark-minor--
                                           * ordered by class--zero-based. */
  
  /* Array of LigatureAttach tables ordered by LigatureCoverage Index */
  struct LigatureArray : List16OfOffset16To<LigatureAttach>
  {
    template <typename Iterator,
              hb_requires (hb_is_iterator (Iterator))>
    bool subset (hb_subset_context_t *c,
                 Iterator             coverage,
                 unsigned             class_count,
                 const hb_map_t      *klass_mapping) const
    {
      TRACE_SUBSET (this);
      const hb_set_t &glyphset = *c->plan->glyphset_gsub ();
  
      auto *out = c->serializer->start_embed (this);
      if (unlikely (!c->serializer->extend_min (out)))  return_trace (false);
  
      bool ret = false;
      for (const auto _ : + hb_zip (coverage, *this)
                    | hb_filter (glyphset, hb_first))
      {
        auto *matrix = out->serialize_append (c->serializer);
        if (unlikely (!matrix)) return_trace (false);
  
        const LigatureAttach& src = (this + _.second);
        auto indexes =
            + hb_range (src.rows * class_count)
            | hb_filter ([=] (unsigned index) { return klass_mapping->has (index % class_count); })
            ;
        ret |= matrix->serialize_subset (c,
  				       _.second,
  				       this,
  				       src.rows,
  				       indexes);
      }
      return_trace (ret);
    }
  };
  
  
  }
  }
  }
  
  #endif /* OT_LAYOUT_GPOS_LIGATUREARRAY_HH */
  

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