blob: 1972ce2b1a6c41b8afcff55e70ed2900dc9e9fa0 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
#pragma once
#include <cstdint>
#include <memory>
namespace search
{
class CBV;
// A lightweight filter of features.
//
// NOTE: this class and its subclasses *ARE* thread-safe.
class FeaturesFilter
{
public:
FeaturesFilter(CBV const & filter, uint64_t threshold);
virtual ~FeaturesFilter() = default;
bool NeedToFilter(CBV const & features) const;
virtual CBV Filter(CBV const & cbv) const = 0;
protected:
CBV const & m_filter;
uint64_t const m_threshold;
};
// Exact filter - leaves only features belonging to the set it was
// constructed from.
class LocalityFilter : public FeaturesFilter
{
public:
LocalityFilter(CBV const & filter);
// FeaturesFilter overrides:
CBV Filter(CBV const & cbv) const override;
};
// Fuzzy filter - tries to leave only features belonging to the set it
// was constructed from, but if the result is empty, leaves at most
// first |threshold| features instead. This property is quite useful
// when there are no matching features in viewport but it's ok to
// process a limited number of features outside the viewport.
class ViewportFilter : public FeaturesFilter
{
public:
ViewportFilter(CBV const & filter, uint64_t threshold);
// FeaturesFilter overrides:
CBV Filter(CBV const & cbv) const override;
};
} // namespace search
|
