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

• #ifndef OT_LAYOUT_GSUB_LIGATURESUBST_HH
  #define OT_LAYOUT_GSUB_LIGATURESUBST_HH
  
  #include "Common.hh"
  #include "LigatureSubstFormat1.hh"
  
  namespace OT {
  namespace Layout {
  namespace GSUB_impl {
  
  struct LigatureSubst
  {
    protected:
    union {
    HBUINT16				format;         /* Format identifier */
    LigatureSubstFormat1_2<SmallTypes>	format1;
  #ifndef HB_NO_BEYOND_64K
    LigatureSubstFormat1_2<MediumTypes>	format2;
  #endif
    } u;
  
    public:
    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)...));
  #ifndef HB_NO_BEYOND_64K
      case 2: return_trace (c->dispatch (u.format2, std::forward<Ts> (ds)...));
  #endif
      default:return_trace (c->default_return_value ());
      }
    }
  
    /* TODO This function is only used by small GIDs, and not updated to 24bit GIDs. Should
     * be done by using iterators. While at it perhaps using iterator of arrays of hb_codepoint_t
     * instead. */
    bool serialize (hb_serialize_context_t *c,
                    hb_sorted_array_t<const HBGlyphID16> first_glyphs,
                    hb_array_t<const unsigned int> ligature_per_first_glyph_count_list,
                    hb_array_t<const HBGlyphID16> ligatures_list,
                    hb_array_t<const unsigned int> component_count_list,
                    hb_array_t<const HBGlyphID16> component_list /* Starting from second for each ligature */)
    {
      TRACE_SERIALIZE (this);
      if (unlikely (!c->extend_min (u.format))) return_trace (false);
      unsigned int format = 1;
      u.format = format;
      switch (u.format) {
      case 1: return_trace (u.format1.serialize (c,
                                                 first_glyphs,
                                                 ligature_per_first_glyph_count_list,
                                                 ligatures_list,
                                                 component_count_list,
                                                 component_list));
      default:return_trace (false);
      }
    }
  
    /* TODO subset() should choose format. */
  
  };
  
  
  }
  }
  }
  
  #endif  /* OT_LAYOUT_GSUB_LIGATURESUBST_HH */
  

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