mirror of
https://github.com/systemed/tilemaker
synced 2025-02-21 13:24:09 +01:00
59 lines
1.8 KiB
C++
59 lines
1.8 KiB
C++
/*! \file */
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#ifndef _PMTILES_H
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#define _PMTILES_H
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#include <fstream>
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#include "external/pmtiles.hpp"
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struct TileOffset {
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uint64_t offset : 40;
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size_t length : 24;
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TileOffset(uint64_t offset, size_t length) : offset(offset),length(length) { }
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TileOffset();
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};
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// Maximum number of tiles in a leaf directory
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#define LEAF_DIRECTORY_SIZE 10000000
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// Combined size of header and root directory (= start of tile data)
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#define HEADER_ROOT 16384
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// Tile ID at which to start using leaf directories (=z6/0/0)
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#define FIRST_LEAF_TILE 1365
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// Threshold for using the root directory only
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#define ROOT_ONLY 2200
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// Maximum size in bytes of tiles considered "tiny" (i.e. potentially repeatable)
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#define TINY_LENGTH 100
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// Expire the tiny cache when it reaches this size
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#define TINY_MAX_SIZE 10000
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class PMTiles {
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public:
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PMTiles();
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virtual ~PMTiles();
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pmtiles::headerv3 header;
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bool isSparse = true;
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void open(std::string &filename);
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void saveTile(int zoom, int x, int y, std::string &data);
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void close(std::string &metadata);
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private:
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std::ofstream outputStream;
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std::mutex fileMutex; // guards file writes, numTilesWritten
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std::mutex indexMutex; // guards access to sparseIndex, denseIndex, tinyCache, numTilesAddressed
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uint64_t leafStart = 0;
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uint64_t numTilesWritten = 0;
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uint64_t numTilesAddressed = 0;
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uint64_t numTileEntries = 0;
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std::map<uint64_t, TileOffset> sparseIndex;
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std::vector<TileOffset> denseIndex;
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std::unordered_map<std::string, TileOffset> tinyCache;
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void appendWithRLE(std::vector<pmtiles::entryv3> &entries, pmtiles::entryv3 &entry);
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void appendTileEntry(uint64_t tileId, TileOffset offset, std::vector<pmtiles::entryv3> &rootEntries, std::vector<pmtiles::entryv3> &entries);
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void flushEntries(std::vector<pmtiles::entryv3> &rootEntries, std::vector<pmtiles::entryv3> &entries);
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};
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#endif //_PMTILES_H
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