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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.cpp
+4 -3
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@@ -665,14 +665,14 @@ std::string version_str() {
return s;
}
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) {
metadata m;
m.name = fname;
m.description = description != NULL ? description : fname;
m.version = 2;
m.type = "overlay";
m.format = vector ? "pbf" : "png";
m.format = tile_format;
m.minzoom = minzoom;
m.maxzoom = maxzoom;
@@ -711,7 +711,8 @@ metadata make_metadata(const char *fname, int minzoom, int maxzoom, double minla
std::string("}");
}
if (vector) {
bool is_vector_format = (strcmp(tile_format, "pbf") == 0 || strcmp(tile_format, "mlt") == 0);
if (is_vector_format) {
{
json_writer state(&m.vector_layers_json);