mbtiles.hpp

#ifndef MBTILES_HPP
#define MBTILES_HPP

#include <math.h>
#include <map>
#include "mvt.hpp"

extern size_t max_tilestats_attributes;
extern size_t max_tilestats_sample_values;
extern size_t max_tilestats_values;

struct type_and_string {
	int type = 0;
	std::string string = "";

	bool operator<(const type_and_string &o) const;
	bool operator!=(const type_and_string &o) const;
};

struct type_and_string_stats {
	std::vector<type_and_string> sample_values = std::vector<type_and_string>();  // sorted
	double min = INFINITY;
	double max = -INFINITY;
	int type = 0;
};

struct layermap_entry {
	size_t id = 0;
	std::map<std::string, type_and_string_stats> file_keys{};
	int minzoom = 0;
	int maxzoom = 0;
	std::string description = "";

	size_t points = 0;
	size_t lines = 0;
	size_t polygons = 0;
	size_t retain = 0;  // keep for tilestats, even if no features directly here

	layermap_entry(size_t _id) {
		id = _id;
	}
};

struct metadata {
	std::string name;
	std::string description;
	int version;
	std::string type;
	std::string format;

	int minzoom;
	int maxzoom;

	double minlat, minlon, maxlat, maxlon;
	double minlat2, minlon2, maxlat2, maxlon2;  // antimeridian-aware

	double center_lon, center_lat;
	int center_z;

	std::string attribution;  // not written if empty

	std::string generator;
	std::string generator_options;

	std::string strategies_json;  // not written if empty

	std::string vector_layers_json;
	std::string tilestats_json;
};

#include "tile.hpp"

sqlite3 *mbtiles_open(char *dbname, char **argv, int forcetable);

void mbtiles_write_tile(sqlite3 *outdb, int z, int tx, int ty, const char *data, int size);
void mbtiles_erase_zoom(sqlite3 *outdb, int z);

metadata make_metadata(const char *fname, int minzoom, int maxzoom, double minlat, double minlon, double maxlat, double maxlon, double minlat2, double minlon2, double maxlat2, double maxlon2, double midlat, double midlon, const char *attribution, std::map<std::string, layermap_entry> const &layermap, bool vector, const char *description, bool do_tilestats, std::map<std::string, std::string> const &attribute_descriptions, std::string const &program, std::string const &commandline, std::vector<strategy> const &strategies);
void mbtiles_write_metadata(sqlite3 *db, const metadata &m, bool forcetable);

void mbtiles_close(sqlite3 *outdb, const char *pgm);

std::map<std::string, layermap_entry> merge_layermaps(std::vector<std::map<std::string, layermap_entry> > const &maps);
std::map<std::string, layermap_entry> merge_layermaps(std::vector<std::map<std::string, layermap_entry> > const &maps, bool trunc);

void add_to_file_keys(std::map<std::string, type_and_string_stats> &file_keys, std::string const &layername, type_and_string const &val);

unsigned long long fnv1a(std::string const &s);

#endif