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

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• Hash : be8a87c4
  Author :
  Date : 2023-01-21T15:00:41
  

  Move TRACE_DISPATCH after may_recurse()
  
  Such that we don't get memory access issues if DEBUG_SANITIZE is
  on and may_recurse() returns false.
  

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• src/OT/Layout/GPOS/SinglePos.hh

• #ifndef OT_LAYOUT_GPOS_SINGLEPOS_HH
  #define OT_LAYOUT_GPOS_SINGLEPOS_HH
  
  #include "SinglePosFormat1.hh"
  #include "SinglePosFormat2.hh"
  
  namespace OT {
  namespace Layout {
  namespace GPOS_impl {
  
  struct SinglePos
  {
    protected:
    union {
    HBUINT16              format;         /* Format identifier */
    SinglePosFormat1      format1;
    SinglePosFormat2      format2;
    } u;
  
    public:
    template<typename Iterator,
             hb_requires (hb_is_iterator (Iterator))>
    unsigned get_format (Iterator glyph_val_iter_pairs)
    {
      hb_array_t<const Value> first_val_iter = hb_second (*glyph_val_iter_pairs);
  
      for (const auto iter : glyph_val_iter_pairs)
        for (const auto _ : hb_zip (iter.second, first_val_iter))
          if (_.first != _.second)
            return 2;
  
      return 1;
    }
  
    template<typename Iterator,
        typename SrcLookup,
        hb_requires (hb_is_iterator (Iterator))>
    void serialize (hb_serialize_context_t *c,
                    const SrcLookup* src,
                    Iterator glyph_val_iter_pairs,
                    const hb_hashmap_t<unsigned, hb_pair_t<unsigned, int>> *layout_variation_idx_delta_map,
                    bool all_axes_pinned)
    {
      if (unlikely (!c->extend_min (u.format))) return;
      unsigned format = 2;
      ValueFormat new_format = src->get_value_format ();
  
      if (all_axes_pinned)
        new_format = new_format.drop_device_table_flags ();
  
      if (glyph_val_iter_pairs)
        format = get_format (glyph_val_iter_pairs);
  
      u.format = format;
      switch (u.format) {
      case 1: u.format1.serialize (c,
                                   src,
                                   glyph_val_iter_pairs,
                                   new_format,
                                   layout_variation_idx_delta_map);
        return;
      case 2: u.format2.serialize (c,
                                   src,
                                   glyph_val_iter_pairs,
                                   new_format,
                                   layout_variation_idx_delta_map);
        return;
      default:return;
      }
    }
  
    template <typename context_t, typename ...Ts>
    typename context_t::return_t dispatch (context_t *c, Ts&&... ds) const
    {
      if (unlikely (!c->may_dispatch (this, &u.format))) return c->no_dispatch_return_value ();
      TRACE_DISPATCH (this, u.format);
      switch (u.format) {
      case 1: return_trace (c->dispatch (u.format1, std::forward<Ts> (ds)...));
      case 2: return_trace (c->dispatch (u.format2, std::forward<Ts> (ds)...));
      default:return_trace (c->default_return_value ());
      }
    }
  };
  
  
  template<typename Iterator, typename SrcLookup>
  static void
  SinglePos_serialize (hb_serialize_context_t *c,
                       const SrcLookup *src,
                       Iterator it,
                       const hb_hashmap_t<unsigned, hb_pair_t<unsigned, int>> *layout_variation_idx_delta_map,
                       bool all_axes_pinned)
  { c->start_embed<SinglePos> ()->serialize (c, src, it, layout_variation_idx_delta_map, all_axes_pinned); }
  
  
  }
  }
  }
  
  #endif /* OT_LAYOUT_GPOS_SINGLEPOS_HH */
  

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