mirror of https://github.com/facebook/rocksdb.git
96 lines
3.4 KiB
C++
96 lines
3.4 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#include <string>
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#include <algorithm>
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#include "rocksdb/utilities/spatial_db.h"
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namespace rocksdb {
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namespace spatial {
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// indexing idea from http://msdn.microsoft.com/en-us/library/bb259689.aspx
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inline uint64_t GetTileFromCoord(double x, double start, double end,
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uint32_t tile_bits) {
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if (x < start) {
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return 0;
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}
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uint64_t tiles = 1ull << tile_bits;
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uint64_t r = static_cast<uint64_t>(((x - start) / (end - start)) * tiles);
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return std::min(r, tiles - 1);
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}
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inline uint64_t GetQuadKeyFromTile(uint64_t tile_x, uint64_t tile_y,
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uint32_t tile_bits) {
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uint64_t quad_key = 0;
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for (uint32_t i = 0; i < tile_bits; ++i) {
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uint64_t mask = (1ull << i);
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quad_key |= (tile_x & mask) << i;
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quad_key |= (tile_y & mask) << (i + 1);
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}
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return quad_key;
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}
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inline BoundingBox<uint64_t> GetTileBoundingBox(
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const SpatialIndexOptions& spatial_index, BoundingBox<double> bbox) {
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return BoundingBox<uint64_t>(
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GetTileFromCoord(bbox.min_x, spatial_index.bbox.min_x,
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spatial_index.bbox.max_x, spatial_index.tile_bits),
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GetTileFromCoord(bbox.min_y, spatial_index.bbox.min_y,
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spatial_index.bbox.max_y, spatial_index.tile_bits),
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GetTileFromCoord(bbox.max_x, spatial_index.bbox.min_x,
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spatial_index.bbox.max_x, spatial_index.tile_bits),
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GetTileFromCoord(bbox.max_y, spatial_index.bbox.min_y,
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spatial_index.bbox.max_y, spatial_index.tile_bits));
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}
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// big endian can be compared using memcpy
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inline void PutFixed64BigEndian(std::string* dst, uint64_t value) {
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char buf[sizeof(value)];
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buf[0] = (value >> 56) & 0xff;
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buf[1] = (value >> 48) & 0xff;
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buf[2] = (value >> 40) & 0xff;
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buf[3] = (value >> 32) & 0xff;
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buf[4] = (value >> 24) & 0xff;
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buf[5] = (value >> 16) & 0xff;
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buf[6] = (value >> 8) & 0xff;
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buf[7] = value & 0xff;
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dst->append(buf, sizeof(buf));
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}
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// big endian can be compared using memcpy
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inline bool GetFixed64BigEndian(const Slice& input, uint64_t* value) {
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if (input.size() < sizeof(uint64_t)) {
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return false;
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}
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auto ptr = input.data();
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*value = (static_cast<uint64_t>(static_cast<unsigned char>(ptr[0])) << 56) |
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(static_cast<uint64_t>(static_cast<unsigned char>(ptr[1])) << 48) |
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(static_cast<uint64_t>(static_cast<unsigned char>(ptr[2])) << 40) |
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(static_cast<uint64_t>(static_cast<unsigned char>(ptr[3])) << 32) |
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(static_cast<uint64_t>(static_cast<unsigned char>(ptr[4])) << 24) |
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(static_cast<uint64_t>(static_cast<unsigned char>(ptr[5])) << 16) |
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(static_cast<uint64_t>(static_cast<unsigned char>(ptr[6])) << 8) |
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static_cast<uint64_t>(static_cast<unsigned char>(ptr[7]));
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return true;
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}
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inline void PutDouble(std::string* dst, double d) {
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dst->append(reinterpret_cast<char*>(&d), sizeof(double));
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}
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inline bool GetDouble(Slice* input, double* d) {
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if (input->size() < sizeof(double)) {
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return false;
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}
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memcpy(d, input->data(), sizeof(double));
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input->remove_prefix(sizeof(double));
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return true;
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}
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} // namespace spatial
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} // namespace rocksdb
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