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Add MLT (MapLibre Tile) output format

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Integrate the C++ MLT encoder from maplibre-tile-spec as a submodule.
Tiles are encoded by converting the existing mvt_tile to
mlt::Encoder::Layer and calling the encoder library directly.

New CLI flags:
  --output-format=mlt     Encode tiles as MLT instead of MVT
  --pretessellate         Pre-triangulate polygons (MLT only)
  --no-mlt-feature-sort   Disable within-tile Hilbert sorting (MLT only)

MLT tiles use .mlt extension in directory output and format=mlt in
mbtiles metadata. Compression and all existing flags work unchanged.
This commit is contained in:
Danila Poyarkov
2026-07-02 17:29:24 +03:00
parent 7fc82a1796
commit 53b98d76c4
15 changed files with 309 additions and 16 deletions
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mbtiles.hpp
+1 -1
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@@ -68,7 +68,7 @@ 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, int basezoom, double droprate, int retain_points_multiplier);
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, const char *tile_format, 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, int basezoom, double droprate, int retain_points_multiplier);
void mbtiles_write_metadata(sqlite3 *db, const metadata &m, bool forcetable);
void mbtiles_close(sqlite3 *outdb, const char *pgm);