src/OT/Layout/GPOS/PairValueRecord.hh

   1 #ifndef OT_LAYOUT_GPOS_PAIRVALUERECORD_HH
   2 #define OT_LAYOUT_GPOS_PAIRVALUERECORD_HH
   3
   4 #include "ValueFormat.hh"
   5
   6 namespace OT {
   7 namespace Layout {
   8 namespace GPOS_impl {
   9
  10
  11 template <typename Types>
  12 struct PairValueRecord
  13 {
  14   template <typename Types2>
  15   friend struct PairSet;
  16
  17   protected:
  18   typename Types::HBGlyphID
  19                 secondGlyph;            /* GlyphID of second glyph in the
  20                                          * pair--first glyph is listed in the
  21                                          * Coverage table */
  22   ValueRecord   values;                 /* Positioning data for the first glyph
  23                                          * followed by for second glyph */
  24   public:
  25   DEFINE_SIZE_ARRAY (Types::HBGlyphID::static_size, values);
  26
  27   int cmp (hb_codepoint_t k) const
  28   { return secondGlyph.cmp (k); }
  29
  30   struct context_t
  31   {
  32     const void          *base;
  33     const ValueFormat   *valueFormats;
  34     const ValueFormat   *newFormats;
  35     unsigned            len1; /* valueFormats[0].get_len() */
  36     const hb_map_t      *glyph_map;
  37     const hb_hashmap_t<unsigned, hb_pair_t<unsigned, int>> *layout_variation_idx_delta_map;
  38   };
  39
  40   bool subset (hb_subset_context_t *c,
  41                context_t *closure) const
  42   {
  43     TRACE_SERIALIZE (this);
  44     auto *s = c->serializer;
  45     auto *out = s->start_embed (*this);
  46     if (unlikely (!s->extend_min (out))) return_trace (false);
  47
  48     out->secondGlyph = (*closure->glyph_map)[secondGlyph];
  49
  50     closure->valueFormats[0].copy_values (s,
  51                                           closure->newFormats[0],
  52                                           closure->base, &values[0],
  53                                           closure->layout_variation_idx_delta_map);
  54     closure->valueFormats[1].copy_values (s,
  55                                           closure->newFormats[1],
  56                                           closure->base,
  57                                           &values[closure->len1],
  58                                           closure->layout_variation_idx_delta_map);
  59
  60     return_trace (true);
  61   }
  62
  63   void collect_variation_indices (hb_collect_variation_indices_context_t *c,
  64                                   const ValueFormat *valueFormats,
  65                                   const void *base) const
  66   {
  67     unsigned record1_len = valueFormats[0].get_len ();
  68     unsigned record2_len = valueFormats[1].get_len ();
  69     const hb_array_t<const Value> values_array = values.as_array (record1_len + record2_len);
  70
  71     if (valueFormats[0].has_device ())
  72       valueFormats[0].collect_variation_indices (c, base, values_array.sub_array (0, record1_len));
  73
  74     if (valueFormats[1].has_device ())
  75       valueFormats[1].collect_variation_indices (c, base, values_array.sub_array (record1_len, record2_len));
  76   }
  77
  78   bool intersects (const hb_set_t& glyphset) const
  79   {
  80     return glyphset.has(secondGlyph);
  81   }
  82
  83   const Value* get_values_1 () const
  84   {
  85     return &values[0];
  86   }
  87
  88   const Value* get_values_2 (ValueFormat format1) const
  89   {
  90     return &values[format1.get_len ()];
  91   }
  92 };
  93
  94
  95 }
  96 }
  97 }
  98
  99 #endif  // OT_LAYOUT_GPOS_PAIRVALUERECORD_HH