kc3-lang/harfbuzz/src/OT/Layout/GSUB/SingleSubst.hh

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• Hash : c180f937
  Author :
  Date : 2022-01-26T08:22:40
  

  [reorg] Move sanitize/dispatch and size macros to top
  

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• src/OT/Layout/GSUB/SingleSubst.hh

• #ifndef OT_LAYOUT_GSUB_SINGLESUBST_HH
  #define OT_LAYOUT_GSUB_SINGLESUBST_HH
  
  #include "Common.hh"
  #include "SingleSubstFormat1.hh"
  #include "SingleSubstFormat2.hh"
  
  namespace OT {
  namespace Layout {
  namespace GSUB {
  
  struct SingleSubst
  {
    protected:
    union {
    HBUINT16              format;         /* Format identifier */
    SingleSubstFormat1    format1;
    SingleSubstFormat2    format2;
    } u;
  
    public:
  
    template <typename context_t, typename ...Ts>
    typename context_t::return_t dispatch (context_t *c, Ts&&... ds) 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, 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,
             hb_requires (hb_is_sorted_source_of (Iterator,
                                                  const hb_codepoint_pair_t))>
    bool serialize (hb_serialize_context_t *c,
                    Iterator glyphs)
    {
      TRACE_SERIALIZE (this);
      if (unlikely (!c->extend_min (u.format))) return_trace (false);
      unsigned format = 2;
      unsigned delta = 0;
      if (glyphs)
      {
        format = 1;
        auto get_delta = [=] (hb_codepoint_pair_t _)
                         { return (unsigned) (_.second - _.first) & 0xFFFF; };
        delta = get_delta (*glyphs);
        if (!hb_all (++(+glyphs), delta, get_delta)) format = 2;
      }
      u.format = format;
      switch (u.format) {
      case 1: return_trace (u.format1.serialize (c,
                                                 + glyphs
                                                 | hb_map_retains_sorting (hb_first),
                                                 delta));
      case 2: return_trace (u.format2.serialize (c, glyphs));
      default:return_trace (false);
      }
    }
  };
  
  template<typename Iterator>
  static void
  SingleSubst_serialize (hb_serialize_context_t *c,
                         Iterator it)
  { c->start_embed<SingleSubst> ()->serialize (c, it); }
  
  }
  }
  }
  
  #endif /* OT_LAYOUT_GSUB_SINGLESUBST_HH */
  

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