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
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
|
#pragma once
#include "geometry/point2d.hpp"
#include "coding/varint.hpp"
#include "base/base.hpp"
#include "base/bits.hpp"
#include "base/array_adapters.hpp"
//@{
inline uint64_t EncodeDelta(m2::PointU const & actual, m2::PointU const & prediction)
{
return bits::BitwiseMerge(
bits::ZigZagEncode(static_cast<int32_t>(actual.x) - static_cast<int32_t>(prediction.x)),
bits::ZigZagEncode(static_cast<int32_t>(actual.y) - static_cast<int32_t>(prediction.y)));
}
inline m2::PointU DecodeDelta(uint64_t delta, m2::PointU const & prediction)
{
uint32_t x, y;
bits::BitwiseSplit(delta, x, y);
return m2::PointU(prediction.x + bits::ZigZagDecode(x), prediction.y + bits::ZigZagDecode(y));
}
//@}
/// Predict next point for polyline with given previous points (p1, p2).
m2::PointU PredictPointInPolyline(m2::PointU const & maxPoint,
m2::PointU const & p1,
m2::PointU const & p2);
/// Predict next point for polyline with given previous points (p1, p2, p3).
m2::PointU PredictPointInPolyline(m2::PointU const & maxPoint,
m2::PointU const & p1,
m2::PointU const & p2,
m2::PointU const & p3);
/// Predict point for neighbour triangle with given
/// previous triangle (p1, p2, p3) and common edge (p1, p2).
m2::PointU PredictPointInTriangle(m2::PointU const & maxPoint,
m2::PointU const & p1,
m2::PointU const & p2,
m2::PointU const & p3);
/// Geometry Coding-Decoding functions.
namespace geo_coding
{
typedef array_read<m2::PointU> InPointsT;
typedef array_write<m2::PointU> OutPointsT;
typedef array_read<uint64_t> InDeltasT;
typedef array_write<uint64_t> OutDeltasT;
void EncodePolylinePrev1(InPointsT const & points,
m2::PointU const & basePoint,
m2::PointU const & maxPoint,
OutDeltasT & deltas);
void DecodePolylinePrev1(InDeltasT const & deltas,
m2::PointU const & basePoint,
m2::PointU const & maxPoint,
OutPointsT & points);
void EncodePolylinePrev2(InPointsT const & points,
m2::PointU const & basePoint,
m2::PointU const & maxPoint,
OutDeltasT & deltas);
void DecodePolylinePrev2(InDeltasT const & deltas,
m2::PointU const & basePoint,
m2::PointU const & maxPoint,
OutPointsT & points);
void EncodePolylinePrev3(InPointsT const & points,
m2::PointU const & basePoint,
m2::PointU const & maxPoint,
OutDeltasT & deltas);
void DecodePolylinePrev3(InDeltasT const & deltas,
m2::PointU const & basePoint,
m2::PointU const & maxPoint,
OutPointsT & points);
inline void EncodePolyline(InPointsT const & points,
m2::PointU const & basePoint,
m2::PointU const & maxPoint,
OutDeltasT & deltas)
{
EncodePolylinePrev2(points, basePoint, maxPoint, deltas);
}
inline void DecodePolyline(InDeltasT const & deltas,
m2::PointU const & basePoint,
m2::PointU const & maxPoint,
OutPointsT & points)
{
DecodePolylinePrev2(deltas, basePoint, maxPoint, points);
}
void EncodeTriangleStrip(InPointsT const & points,
m2::PointU const & basePoint,
m2::PointU const & maxPoint,
OutDeltasT & deltas);
void DecodeTriangleStrip(InDeltasT const & deltas,
m2::PointU const & basePoint,
m2::PointU const & maxPoint,
OutPointsT & points);
}
|
