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Progress toward making a tileset metadata structure

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This commit is contained in:
Erica Fischer 2022-12-02 13:15:24 -08:00
parent 5c647cdb83
commit e9fa4f3aa1
2 changed files with 137 additions and 1 deletions
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116
mbtiles.cpp
View File

@ -430,7 +430,121 @@ std::string stringify_strategies(std::vector<strategy> const &strategies) {
}
}
void mbtiles_write_metadata(sqlite3 *outdb, const char *outdir, const char *fname, int minzoom, int maxzoom, double minlat, double minlon, double maxlat, double maxlon, double midlat, double midlon, int forcetable, 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 *outdb, const metadata &m, bool forcetable) {
}
void dirtiles_write_metadata(const char *outdir, const metadata &m, bool forcetable) {
}
metadata make_metadata(const char *fname, int minzoom, int maxzoom, double minlat, double minlon, double maxlat, double maxlon, 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) {
metadata m;
m.minzoom = minzoom;
m.maxzoom = maxzoom;
m.minlat = minlat;
m.minlon = minlon;
m.maxlat = maxlat;
m.maxlon = maxlon;
m.center_lat = midlat;
m.center_lon = midlon;
m.center_z = maxzoom;
if (attribution != NULL) {
m.attribution.insert(attribution);
}
if (vector) {
{
json_writer state(&m.vector_layers_json);
state.json_write_array();
std::vector<std::string> lnames;
for (auto ai = layermap.begin(); ai != layermap.end(); ++ai) {
lnames.push_back(ai->first);
}
for (size_t i = 0; i < lnames.size(); i++) {
auto fk = layermap.find(lnames[i]);
state.json_write_hash();
state.json_write_string("id");
state.json_write_string(lnames[i]);
state.json_write_string("description");
state.json_write_string(fk->second.description);
state.json_write_string("minzoom");
state.json_write_signed(fk->second.minzoom);
state.json_write_string("maxzoom");
state.json_write_signed(fk->second.maxzoom);
state.json_write_string("fields");
state.json_write_hash();
state.nospace = true;
bool first = true;
size_t attribute_count = 0;
for (auto j = fk->second.file_keys.begin(); j != fk->second.file_keys.end(); ++j) {
if (first) {
first = false;
}
state.json_write_string(j->first);
auto f = attribute_descriptions.find(j->first);
if (f == attribute_descriptions.end()) {
int type = 0;
for (auto s : j->second.sample_values) {
type |= (1 << s.type);
}
if (type == (1 << mvt_double)) {
state.json_write_string("Number");
} else if (type == (1 << mvt_bool)) {
state.json_write_string("Boolean");
} else if (type == (1 << mvt_string)) {
state.json_write_string("String");
} else {
state.json_write_string("Mixed");
}
} else {
state.json_write_string(f->second);
}
attribute_count++;
if (attribute_count >= max_tilestats_attributes) {
break;
}
}
state.nospace = true;
state.json_end_hash();
state.json_end_hash();
}
state.json_end_array();
}
{
size_t elements = max_tilestats_values;
json_writer state(&m.tilestats_json);
if (do_tilestats && elements > 0) {
tilestats(layermap, elements, state);
}
}
}
return m;
}
void old_mbtiles_write_metadata(sqlite3 *outdb, const char *outdir, const char *fname, int minzoom, int maxzoom, double minlat, double minlon, double maxlat, double maxlon, double midlat, double midlon, int forcetable, 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) {
char *sql, *err;
sqlite3 *db = outdb;

22
mbtiles.hpp
View File

@ -41,6 +41,28 @@ struct layermap_entry {
}
};
struct metadata {
std::string name;
std::string description;
int version;
int minzoom;
int maxzoom;
double center_lon, center_lat;
int center_z;
double minlat, minlon, maxlat, maxlon;
std::string type;
std::string format;
std::string generator;
std::string generator_options;
// Should be std::optional if I weren't trying to live in the past
std::set<std::string> attribution;
std::set<std::string> strategies_json;
std::string vector_layers_json;
std::string tilestats_json;
};
#include "tile.hpp"
sqlite3 *mbtiles_open(char *dbname, char **argv, int forcetable);