kc3-lang/harfbuzz/src/OT/Layout/GSUB/MultipleSubstFormat1.hh

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• Hash : a4e0fd16
  Author :
  Date : 2022-08-05T15:05:51
  

  [MultipleSubst] Rewrite serialize signature as single iterator
  

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• src/OT/Layout/GSUB/MultipleSubstFormat1.hh

• #ifndef OT_LAYOUT_GSUB_MULTIPLESUBSTFORMAT1_HH
  #define OT_LAYOUT_GSUB_MULTIPLESUBSTFORMAT1_HH
  
  #include "Common.hh"
  #include "Sequence.hh"
  
  namespace OT {
  namespace Layout {
  namespace GSUB_impl {
  
  template <typename Types>
  struct MultipleSubstFormat1_2
  {
    protected:
    HBUINT16      format;                 /* Format identifier--format = 1 */
    typename Types::template OffsetTo<Coverage>
                  coverage;               /* Offset to Coverage table--from
                                           * beginning of Substitution table */
    Array16Of<typename Types::template OffsetTo<Sequence<Types>>>
                  sequence;               /* Array of Sequence tables
                                           * ordered by Coverage Index */
    public:
    DEFINE_SIZE_ARRAY (4 + Types::size, sequence);
  
    bool sanitize (hb_sanitize_context_t *c) const
    {
      TRACE_SANITIZE (this);
      return_trace (coverage.sanitize (c, this) && sequence.sanitize (c, this));
    }
  
    bool intersects (const hb_set_t *glyphs) const
    { return (this+coverage).intersects (glyphs); }
  
    bool may_have_non_1to1 () const
    { return true; }
  
    void closure (hb_closure_context_t *c) const
    {
      + hb_zip (this+coverage, sequence)
      | hb_filter (c->parent_active_glyphs (), hb_first)
      | hb_map (hb_second)
      | hb_map (hb_add (this))
      | hb_apply ([c] (const Sequence<Types> &_) { _.closure (c); })
      ;
    }
  
    void closure_lookups (hb_closure_lookups_context_t *c) const {}
  
    void collect_glyphs (hb_collect_glyphs_context_t *c) const
    {
      if (unlikely (!(this+coverage).collect_coverage (c->input))) return;
      + hb_zip (this+coverage, sequence)
      | hb_map (hb_second)
      | hb_map (hb_add (this))
      | hb_apply ([c] (const Sequence<Types> &_) { _.collect_glyphs (c); })
      ;
    }
  
    const Coverage &get_coverage () const { return this+coverage; }
  
    bool would_apply (hb_would_apply_context_t *c) const
    { return c->len == 1 && (this+coverage).get_coverage (c->glyphs[0]) != NOT_COVERED; }
  
    bool apply (hb_ot_apply_context_t *c) const
    {
      TRACE_APPLY (this);
  
      unsigned int index = (this+coverage).get_coverage (c->buffer->cur().codepoint);
      if (likely (index == NOT_COVERED)) return_trace (false);
  
      return_trace ((this+sequence[index]).apply (c));
    }
  
    template<typename Iterator,
             hb_requires (hb_is_sorted_iterator (Iterator))>
    bool serialize (hb_serialize_context_t *c,
  		  Iterator it)
    {
      TRACE_SERIALIZE (this);
      auto sequences =
        + it
        | hb_map (hb_second)
        ;
      auto glyphs =
        + it
        | hb_map_retains_sorting (hb_first)
        ;
      if (unlikely (!c->extend_min (this))) return_trace (false);
  
      if (unlikely (!sequence.serialize (c, sequences.length))) return_trace (false);
  
      for (auto& pair : hb_zip (sequences, sequence))
      {
        if (unlikely (!pair.second
  		    .serialize_serialize (c, pair.first)))
          return_trace (false);
      }
  
      return_trace (coverage.serialize_serialize (c, glyphs));
    }
  
    bool subset (hb_subset_context_t *c) const
    {
      TRACE_SUBSET (this);
      const hb_set_t &glyphset = *c->plan->glyphset_gsub ();
      const hb_map_t &glyph_map = *c->plan->glyph_map;
  
      auto *out = c->serializer->start_embed (*this);
      if (unlikely (!c->serializer->extend_min (out))) return_trace (false);
      out->format = format;
  
      hb_sorted_vector_t<hb_codepoint_t> new_coverage;
      + hb_zip (this+coverage, sequence)
      | hb_filter (glyphset, hb_first)
      | hb_filter (subset_offset_array (c, out->sequence, this), hb_second)
      | hb_map (hb_first)
      | hb_map (glyph_map)
      | hb_sink (new_coverage)
      ;
      out->coverage.serialize_serialize (c->serializer, new_coverage.iter ());
      return_trace (bool (new_coverage));
    }
  };
  
  }
  }
  }
  
  
  #endif /* OT_LAYOUT_GSUB_MULTIPLESUBSTFORMAT1_HH */
  

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