LSST Applications g04e9c324dd+8c5ae1fdc5,g134cb467dc+1b3060144d,g18429d2f64+f642bf4753,g199a45376c+0ba108daf9,g1fd858c14a+2dcf163641,g262e1987ae+7b8c96d2ca,g29ae962dfc+3bd6ecb08a,g2cef7863aa+aef1011c0b,g35bb328faa+8c5ae1fdc5,g3fd5ace14f+53e1a9e7c5,g4595892280+fef73a337f,g47891489e3+2efcf17695,g4d44eb3520+642b70b07e,g53246c7159+8c5ae1fdc5,g67b6fd64d1+2efcf17695,g67fd3c3899+b70e05ef52,g74acd417e5+317eb4c7d4,g786e29fd12+668abc6043,g87389fa792+8856018cbb,g89139ef638+2efcf17695,g8d7436a09f+3be3c13596,g8ea07a8fe4+9f5ccc88ac,g90f42f885a+a4e7b16d9b,g97be763408+ad77d7208f,g9dd6db0277+b70e05ef52,ga681d05dcb+a3f46e7fff,gabf8522325+735880ea63,gac2eed3f23+2efcf17695,gb89ab40317+2efcf17695,gbf99507273+8c5ae1fdc5,gd8ff7fe66e+b70e05ef52,gdab6d2f7ff+317eb4c7d4,gdc713202bf+b70e05ef52,gdfd2d52018+b10e285e0f,ge365c994fd+310e8507c4,ge410e46f29+2efcf17695,geaed405ab2+562b3308c0,gffca2db377+8c5ae1fdc5,w.2025.35
LSST Data Management Base Package
Loading...
Searching...
No Matches
Chunker.h
Go to the documentation of this file.
1/*
2 * This file is part of sphgeom.
3 *
4 * Developed for the LSST Data Management System.
5 * This product includes software developed by the LSST Project
6 * (http://www.lsst.org).
7 * See the COPYRIGHT file at the top-level directory of this distribution
8 * for details of code ownership.
9 *
10 * This software is dual licensed under the GNU General Public License and also
11 * under a 3-clause BSD license. Recipients may choose which of these licenses
12 * to use; please see the files gpl-3.0.txt and/or bsd_license.txt,
13 * respectively. If you choose the GPL option then the following text applies
14 * (but note that there is still no warranty even if you opt for BSD instead):
15 *
16 * This program is free software: you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation, either version 3 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program. If not, see <http://www.gnu.org/licenses/>.
28 */
29
30#ifndef LSST_SPHGEOM_CHUNKER_H_
31#define LSST_SPHGEOM_CHUNKER_H_
32
36
37#include <vector>
38#include <cstdint>
39
40#include "Angle.h"
41#include "Box.h"
42
43
44namespace lsst {
45namespace sphgeom {
46
61
62
73class Chunker {
74public:
75 Chunker(std::int32_t numStripes,
76 std::int32_t numSubStripesPerStripe);
77
78 bool operator==(Chunker const & c) const {
79 return _numStripes == c._numStripes &&
80 _numSubStripesPerStripe == c._numSubStripesPerStripe;
81 }
82
83 bool operator!=(Chunker const & c) const {
84 return _numStripes != c._numStripes ||
85 _numSubStripesPerStripe != c._numSubStripesPerStripe;
86 }
87
91 return _numStripes;
92 }
93
97 return _numSubStripesPerStripe;
98 }
99
103
107
111
115
117 bool valid(std::int32_t chunkId) const;
118
120 Box getSubChunkBoundingBox(std::int32_t subStripe, std::int32_t subChunk) const;
121
124 return chunkId / (2 * _numStripes);
125 }
126
129 return chunkId - stripe*2*_numStripes;
130 }
131
132private:
133 struct Stripe {
134 Angle chunkWidth;
135 std::int32_t numChunksPerStripe;
136 std::int32_t numSubChunksPerChunk;
137
138 Stripe() :
139 chunkWidth(0),
140 numChunksPerStripe(0),
141 numSubChunksPerChunk(0)
142 {}
143 };
144
145 struct SubStripe {
146 Angle subChunkWidth;
147 std::int32_t numSubChunksPerChunk;
148
149 SubStripe() : subChunkWidth(), numSubChunksPerChunk(0) {}
150 };
151
152 std::int32_t _getChunkId(std::int32_t stripe, std::int32_t chunk) const {
153 return stripe * 2 * _numStripes + chunk;
154 }
155
156 std::int32_t _getSubChunkId(std::int32_t stripe, std::int32_t subStripe,
157 std::int32_t chunk, std::int32_t subChunk) const {
158 std::int32_t y = subStripe - stripe * _numSubStripesPerStripe;
159 std::int32_t x = subChunk -
160 chunk * _subStripes[subStripe].numSubChunksPerChunk;
161 return y * _maxSubChunksPerSubStripeChunk + x;
162 }
163
164 void _getSubChunks(std::vector<SubChunks> & subChunks,
165 Region const & r,
166 NormalizedAngleInterval const & lon,
167 std::int32_t stripe,
168 std::int32_t chunk,
169 std::int32_t minSS,
170 std::int32_t maxSS) const;
171
172 std::int32_t _numStripes;
173 std::int32_t _numSubStripesPerStripe;
174 std::int32_t _numSubStripes;
175 std::int32_t _maxSubChunksPerSubStripeChunk;
176 Angle _subStripeHeight;
177 std::vector<Stripe> _stripes;
178 std::vector<SubStripe> _subStripes;
179};
180
181}} // namespace lsst::sphgeom
182
183#endif // LSST_SPHGEOM_CHUNKER_H_
Angle represents an angle in radians.
Definition Angle.h:50
Box represents a rectangle in spherical coordinate space that contains its boundary.
Definition Box.h:62
bool operator!=(Chunker const &c) const
Definition Chunker.h:83
std::int32_t getChunk(std::int32_t chunkId, std::int32_t stripe) const
Return the chunk for the given chunkId and stripe.
Definition Chunker.h:128
std::int32_t getNumSubStripesPerStripe() const
getNumSubStripesPerStripe returns the number of fixed-height latitude sub-intervals in each stripe.
Definition Chunker.h:96
std::vector< std::int32_t > getAllChunks() const
getAllChunks returns the complete set of chunk IDs for the unit sphere.
Definition Chunker.cc:265
Chunker(std::int32_t numStripes, std::int32_t numSubStripesPerStripe)
Definition Chunker.cc:64
std::int32_t getNumStripes() const
getNumStripes returns the number of fixed-height latitude intervals in the sky subdivision.
Definition Chunker.h:90
std::vector< std::int32_t > getAllSubChunks(std::int32_t chunkId) const
getAllSubChunks returns the complete set of sub-chunk IDs for the given chunk.
Definition Chunker.cc:276
std::int32_t getStripe(std::int32_t chunkId) const
Return the stripe for the specified chunkId.
Definition Chunker.h:123
std::vector< std::int32_t > getChunksIntersecting(Region const &r) const
getChunksIntersecting returns all the chunks that potentially intersect the given region.
Definition Chunker.cc:110
bool operator==(Chunker const &c) const
Definition Chunker.h:78
std::vector< SubChunks > getSubChunksIntersecting(Region const &r) const
getSubChunksIntersecting returns all the sub-chunks that potentially intersect the given region.
Definition Chunker.cc:155
Box getSubChunkBoundingBox(std::int32_t subStripe, std::int32_t subChunk) const
Definition Chunker.cc:309
Box getChunkBoundingBox(std::int32_t stripe, std::int32_t chunk) const
Definition Chunker.cc:298
bool valid(std::int32_t chunkId) const
Return 'true' if the specified chunk number is valid.
Definition Chunker.cc:292
Region is a minimal interface for 2-dimensional regions on the unit sphere.
Definition Region.h:89
lsst::geom::Angle Angle
Definition misc.h:33
This file declares a class for representing angles.
This file declares a class for representing longitude/latitude angle boxes on the unit sphere.
void swap(SubChunks &sc)
Definition Chunker.h:56
std::vector< std::int32_t > subChunkIds
Definition Chunker.h:52
std::int32_t chunkId
Definition Chunker.h:51
T swap(T... args)