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#include "search/v2/features_filter.hpp"
#include "coding/compressed_bit_vector.hpp"
#include "std/algorithm.hpp"
namespace search
{
namespace v2
{
// FeaturesFilter ----------------------------------------------------------------------------------
FeaturesFilter::FeaturesFilter(coding::CompressedBitVector const & filter, uint32_t threshold)
: m_filter(filter), m_threshold(threshold)
{
}
bool FeaturesFilter::NeedToFilter(coding::CompressedBitVector const & cbv) const
{
return cbv.PopCount() > m_threshold;
}
// LocalityFilter ----------------------------------------------------------------------------------
LocalityFilter::LocalityFilter(coding::CompressedBitVector const & filter)
: FeaturesFilter(filter, 0 /* threshold */)
{
}
unique_ptr<coding::CompressedBitVector> LocalityFilter::Filter(
coding::CompressedBitVector const & cbv) const
{
return coding::CompressedBitVector::Intersect(m_filter, cbv);
}
// ViewportFilter ----------------------------------------------------------------------------------
ViewportFilter::ViewportFilter(coding::CompressedBitVector const & filter, uint32_t threshold)
: FeaturesFilter(filter, threshold)
{
}
unique_ptr<coding::CompressedBitVector> ViewportFilter::Filter(
coding::CompressedBitVector const & cbv) const
{
auto result = coding::CompressedBitVector::Intersect(m_filter, cbv);
if (!coding::CompressedBitVector::IsEmpty(result))
return result;
return cbv.LeaveFirstSetNBits(m_threshold);
}
} // namespace v2
} // namespace search
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