Method SerializeForMwm

generator/feature_builder.cpp:638–727

}

void FeatureBuilder::SerializeForMwm(SupportingData & data, serial::GeometryCodingParams const & params) const
{
  data.m_buffer.clear();

  PushBackByteSink<Buffer> sink(data.m_buffer);
  FeatureParams(m_params).Write(sink);

  GeomType const type = m_params.GetGeomType();
  CHECK(type != GeomType::Undefined, ());
  if (type == GeomType::Point)
  {
    uint64_t const encoded =
        coding::EncodePointDeltaAsUint(PointDToPointU(m_center, params.GetCoordBits()), params.GetBasePoint());
    CHECK_GREATER(bits::NumHiZeroBits64(encoded), 1, ());
    WriteVarUint(sink, encoded << 1);  // Relations control bit
    return;
  }

  uint8_t const ptsCount = base::asserted_cast<uint8_t>(data.m_innerPts.size());
  uint8_t trgCount = base::asserted_cast<uint8_t>(data.m_innerTrg.size());
  if (trgCount > 0)
  {
    CHECK_GREATER(trgCount, 2, ());
    trgCount -= 2;
  }

  {
    BitWriter<PushBackByteSink<Buffer>> bitSink(sink);

    if (type == GeomType::Line)
    {
      bitSink.Write(ptsCount != 0 ? ptsCount : data.m_ptsMask, 4);
      bitSink.Write(ptsCount == 0 ? 1 : 0, 1);
    }
    else
    {
      CHECK_EQUAL(type, GeomType::Area, ());
      bitSink.Write(trgCount != 0 ? trgCount : data.m_trgMask, 4);
      bitSink.Write(trgCount == 0 ? 1 : 0, 1);
    }

    // Relations control bit
    bitSink.Write(0, 1);
  }

  if (type == GeomType::Line)
  {
    if (ptsCount > 0)
    {
      if (ptsCount > 2)
      {
        uint32_t v = data.m_ptsSimpMask;
        int const count = (ptsCount - 2 + 3) / 4;
        CHECK_LESS(count, 4, ());
        for (int i = 0; i < count; ++i)
        {
          WriteToSink(sink, static_cast<uint8_t>(v));
          v >>= 8;