Crate mlt_wasm 

WebAssembly bindings for the MapLibre Tile (MLT) format.

Design

decodeTileColumns hands every layer to JS as typed arrays in one call, read straight off mlt-core’s decoded columns. No per-layer or per-feature WASM objects are kept alive, so nothing needs freeing, and JS walks the arrays with zero boundary crossings.

Geometry

The vertex buffer is passed on as decoded: (x, y) pairs, or (x, y, z) triples when the layer has z coordinates, as the v2 wire format interleaves them.

Ids and properties

Each column is one value per feature with a presence bitmap beside it, rather than a sentinel. 64-bit integers come out as f64, so values above Number.MAX_SAFE_INTEGER lose precision.

Annotate

annotateTile is the other entry point: it walks a tile into an AnnotatedTile handle over its regions, for tooling that shows the wire format rather than the decoded tile.

Functions

tile_geojson

Decode a raw MLT tile blob into GeoJSON, as the serialized text.