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

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• Hash : 704e696a
  Author :
  Date : 2022-07-06T14:19:20
  

  [>64k:layout] Templatize LigatureSubst
  

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• src/OT/Layout/GSUB/LigatureSet.hh

• #ifndef OT_LAYOUT_GSUB_LIGATURESET_HH
  #define OT_LAYOUT_GSUB_LIGATURESET_HH
  
  #include "Common.hh"
  #include "Ligature.hh"
  
  namespace OT {
  namespace Layout {
  namespace GSUB_impl {
  
  template <typename Types>
  struct LigatureSet
  {
    protected:
    Array16OfOffset16To<Ligature<Types>>
                  ligature;               /* Array LigatureSet tables
                                           * ordered by preference */
    public:
    DEFINE_SIZE_ARRAY (2, ligature);
  
    bool sanitize (hb_sanitize_context_t *c) const
    {
      TRACE_SANITIZE (this);
      return_trace (ligature.sanitize (c, this));
    }
  
    bool intersects (const hb_set_t *glyphs) const
    {
      return
      + hb_iter (ligature)
      | hb_map (hb_add (this))
      | hb_map ([glyphs] (const Ligature<Types> &_) { return _.intersects (glyphs); })
      | hb_any
      ;
    }
  
    void closure (hb_closure_context_t *c) const
    {
      + hb_iter (ligature)
      | hb_map (hb_add (this))
      | hb_apply ([c] (const Ligature<Types> &_) { _.closure (c); })
      ;
    }
  
    void collect_glyphs (hb_collect_glyphs_context_t *c) const
    {
      + hb_iter (ligature)
      | hb_map (hb_add (this))
      | hb_apply ([c] (const Ligature<Types> &_) { _.collect_glyphs (c); })
      ;
    }
  
    bool would_apply (hb_would_apply_context_t *c) const
    {
      return
      + hb_iter (ligature)
      | hb_map (hb_add (this))
      | hb_map ([c] (const Ligature<Types> &_) { return _.would_apply (c); })
      | hb_any
      ;
    }
  
    bool apply (hb_ot_apply_context_t *c) const
    {
      TRACE_APPLY (this);
      unsigned int num_ligs = ligature.len;
      for (unsigned int i = 0; i < num_ligs; i++)
      {
        const auto &lig = this+ligature[i];
        if (lig.apply (c)) return_trace (true);
      }
  
      return_trace (false);
    }
  
    bool serialize (hb_serialize_context_t *c,
                    hb_array_t<const HBGlyphID16> ligatures,
                    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 (this))) return_trace (false);
      if (unlikely (!ligature.serialize (c, ligatures.length))) return_trace (false);
      for (unsigned int i = 0; i < ligatures.length; i++)
      {
        unsigned int component_count = (unsigned) hb_max ((int) component_count_list[i] - 1, 0);
        if (unlikely (!ligature[i].serialize_serialize (c,
                                                        ligatures[i],
                                                        component_list.sub_array (0, component_count))))
          return_trace (false);
        component_list += component_count;
      }
      return_trace (true);
    }
  
    bool subset (hb_subset_context_t *c, unsigned coverage_idx) const
    {
      TRACE_SUBSET (this);
      auto *out = c->serializer->start_embed (*this);
      if (unlikely (!c->serializer->extend_min (out))) return_trace (false);
  
      + hb_iter (ligature)
      | hb_filter (subset_offset_array (c, out->ligature, this, coverage_idx))
      | hb_drain
      ;
  
      if (bool (out->ligature))
        // Ensure Coverage table is always packed after this.
        c->serializer->add_virtual_link (coverage_idx);
  
      return_trace (bool (out->ligature));
    }
  };
  
  }
  }
  }
  
  #endif  /* OT_LAYOUT_GSUB_LIGATURESET_HH */
  

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