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Drop or coalesce points too when dropping or coalescing smallest (#6)

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* Handle points too when dropping or coalescing the "smallest" features.

* Add statistics of tile size reduction strategies to tileset metadata

* Update changelog and version

* Update documentation
This commit is contained in:
Erica Fischer
2022-08-09 15:29:03 -07:00
committed by GitHub
parent 67cd9d8d85
commit c65d6938a4
63 changed files with 574 additions and 18 deletions
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mbtiles.cpp
+63 -1
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@@ -267,7 +267,57 @@ void tilestats(std::map<std::string, layermap_entry> const &layermap1, size_t el
state.json_end_hash();
}
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::string stringify_strategies(std::vector<strategy> const &strategies) {
std::string out;
json_writer state(&out);
bool any = false;
state.json_write_array();
for (size_t i = 0; i < strategies.size(); i++) {
state.json_write_hash();
if (strategies[i].dropped_by_rate > 0) {
state.json_write_string("dropped_by_rate");
state.json_write_number(strategies[i].dropped_by_rate);
any = true;
}
if (strategies[i].dropped_by_gamma > 0) {
state.json_write_string("dropped_by_gamma");
state.json_write_number(strategies[i].dropped_by_gamma);
any = true;
}
if (strategies[i].dropped_as_needed > 0) {
state.json_write_string("dropped_as_needed");
state.json_write_number(strategies[i].dropped_as_needed);
any = true;
}
if (strategies[i].coalesced_as_needed > 0) {
state.json_write_string("coalesced_as_needed");
state.json_write_number(strategies[i].coalesced_as_needed);
any = true;
}
if (strategies[i].detail_reduced > 0) {
state.json_write_string("detail_reduced");
state.json_write_number(strategies[i].detail_reduced);
any = true;
}
state.json_end_hash();
}
state.json_end_array();
if (any) {
return out;
} else {
return "";
}
}
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) {
char *sql, *err;
sqlite3 *db = outdb;
@@ -393,6 +443,18 @@ void mbtiles_write_metadata(sqlite3 *outdb, const char *outdir, const char *fnam
}
sqlite3_free(sql);
std::string strat = stringify_strategies(strategies);
if (strat.size() > 0) {
sql = sqlite3_mprintf("INSERT INTO metadata (name, value) VALUES ('strategies', %Q);", strat.c_str());
if (sqlite3_exec(db, sql, NULL, NULL, &err) != SQLITE_OK) {
fprintf(stderr, "set strategies: %s\n", err);
if (!forcetable) {
exit(EXIT_FAILURE);
}
}
sqlite3_free(sql);
}
if (vector) {
size_t elements = max_tilestats_values;
std::string buf;