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#include "indexer/centers_table.hpp"
#include "indexer/feature_processor.hpp"
#include "coding/endianness.hpp"
#include "coding/file_container.hpp"
#include "coding/geometry_coding.hpp"
#include "coding/memory_region.hpp"
#include "coding/point_coding.hpp"
#include "coding/reader.hpp"
#include "coding/succinct_mapper.hpp"
#include "coding/varint.hpp"
#include "coding/write_to_sink.hpp"
#include "coding/writer.hpp"
#include "base/assert.hpp"
#include "base/checked_cast.hpp"
#include "base/logging.hpp"
#include <unordered_map>
#include "3party/succinct/elias_fano.hpp"
#include "3party/succinct/rs_bit_vector.hpp"
using namespace std;
namespace search
{
bool CentersTable::Get(uint32_t id, m2::PointD & center)
{
m2::PointU pointu;
if (!m_map->Get(id, pointu))
return false;
center = PointUToPointD(pointu, m_codingParams.GetCoordBits());
return true;
}
// CentersTable ------------------------------------------------------------------------------------
// static
unique_ptr<CentersTable> CentersTable::Load(Reader & reader,
serial::GeometryCodingParams const & codingParams)
{
auto table = make_unique<CentersTable>();
if (!table->Init(reader, codingParams))
return {};
return table;
}
bool CentersTable::Init(Reader & reader, serial::GeometryCodingParams const & codingParams)
{
m_codingParams = codingParams;
// Decodes block encoded by writeBlockCallback from CentersTableBuilder::Freeze.
auto const readBlockCallback = [&](NonOwningReaderSource & source, uint32_t blockSize,
vector<m2::PointU> & values) {
values.resize(blockSize);
uint64_t delta = ReadVarUint<uint64_t>(source);
values[0] = coding::DecodePointDeltaFromUint(delta, m_codingParams.GetBasePoint());
for (size_t i = 1; i < blockSize && source.Size() > 0; ++i)
{
delta = ReadVarUint<uint64_t>(source);
values[i] = coding::DecodePointDeltaFromUint(delta, values[i - 1]);
}
};
m_map = Map::Load(reader, readBlockCallback);
return m_map != nullptr;
}
// CentersTableBuilder -----------------------------------------------------------------------------
void CentersTableBuilder::Put(uint32_t featureId, m2::PointD const & center)
{
m_builder.Put(featureId, PointDToPointU(center, m_codingParams.GetCoordBits()));
}
void CentersTableBuilder::Freeze(Writer & writer) const
{
// Each center is encoded as delta from some prediction.
// For the first center in the block map base point is used as a prediction, for all other
// centers in the block previous center is used as a prediction.
auto const writeBlockCallback = [&](Writer & w, vector<m2::PointU>::const_iterator begin,
vector<m2::PointU>::const_iterator end) {
uint64_t delta = coding::EncodePointDeltaAsUint(*begin, m_codingParams.GetBasePoint());
WriteVarUint(w, delta);
auto prevIt = begin;
for (auto it = begin + 1; it != end; ++it)
{
delta = coding::EncodePointDeltaAsUint(*it, *prevIt);
WriteVarUint(w, delta);
prevIt = it;
}
};
m_builder.Freeze(writer, writeBlockCallback);
}
} // namespace search
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