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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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main.cpp
+21 -1
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@@ -104,6 +104,9 @@ bool drop_by_attribute_descending = false;
std::vector<order_field> order_by;
bool order_reverse;
bool order_by_size = false;
int output_format = OUTPUT_MVT;
bool mlt_sort_features = true;
bool mlt_pretessellate = false;
int prevent[256];
int additional[256];
@@ -2824,7 +2827,8 @@ std::pair<int, metadata> read_input(std::vector<source> &sources, char *fname, i
ai->second.maxzoom = maxzoom;
}
metadata m = make_metadata(fname, minzoom, maxzoom, minlat, minlon, maxlat, maxlon, minlat2, minlon2, maxlat2, maxlon2, midlat, midlon, attribution, merged_lm, true, description, !prevent[P_TILE_STATS], attribute_descriptions, "tippecanoe", commandline, strategies, basezoom, droprate, retain_points_multiplier);
const char *tile_format = (output_format == OUTPUT_MLT) ? "mlt" : "pbf";
metadata m = make_metadata(fname, minzoom, maxzoom, minlat, minlon, maxlat, maxlon, minlat2, minlon2, maxlat2, maxlon2, midlat, midlon, attribution, merged_lm, tile_format, description, !prevent[P_TILE_STATS], attribute_descriptions, "tippecanoe", commandline, strategies, basezoom, droprate, retain_points_multiplier);
if (outdb != NULL) {
mbtiles_write_metadata(outdb, m, forcetable);
} else {
@@ -3160,6 +3164,9 @@ int main(int argc, char **argv) {
{"no-feature-limit", no_argument, &prevent[P_FEATURE_LIMIT], 1},
{"no-tile-size-limit", no_argument, &prevent[P_KILOBYTE_LIMIT], 1},
{"no-tile-compression", no_argument, &prevent[P_TILE_COMPRESSION], 1},
{"output-format", required_argument, 0, '~'},
{"pretessellate", no_argument, 0, '~'},
{"no-mlt-feature-sort", no_argument, 0, '~'},
{"no-tile-stats", no_argument, &prevent[P_TILE_STATS], 1},
{"tile-stats-attributes-limit", required_argument, 0, '~'},
{"tile-stats-sample-values-limit", required_argument, 0, '~'},
@@ -3327,6 +3334,19 @@ int main(int argc, char **argv) {
unidecode_data = read_unidecode(optarg);
} else if (strcmp(opt, "maximum-string-attribute-length") == 0) {
maximum_string_attribute_length = atoll_require(optarg, "Maximum string attribute length");
} else if (strcmp(opt, "output-format") == 0) {
if (strcmp(optarg, "mvt") == 0 || strcmp(optarg, "pbf") == 0) {
output_format = OUTPUT_MVT;
} else if (strcmp(optarg, "mlt") == 0) {
output_format = OUTPUT_MLT;
} else {
fprintf(stderr, "%s: --output-format must be 'mvt' or 'mlt'\n", argv[0]);
exit(EXIT_ARGS);
}
} else if (strcmp(opt, "pretessellate") == 0) {
mlt_pretessellate = true;
} else if (strcmp(opt, "no-mlt-feature-sort") == 0) {
mlt_sort_features = false;
} else {
fprintf(stderr, "%s: Unrecognized option --%s\n", argv[0], opt);
exit(EXIT_ARGS);