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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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tests/mlt/points.geojson
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{"type":"FeatureCollection","features":[
{"type":"Feature","id":1,"properties":{"name":"point1","count":100,"active":true},"geometry":{"type":"Point","coordinates":[-122.4,37.8]}},
{"type":"Feature","id":2,"properties":{"name":"point2","count":200,"active":false},"geometry":{"type":"Point","coordinates":[-122.5,37.9]}},
{"type":"Feature","id":3,"properties":{"name":"point3","count":300},"geometry":{"type":"Point","coordinates":[-122.6,38.0]}}
]}