s2maps-gpu/dist/workers/source/s2pmtilesSource.js

S2 Maps GPU - An open source, high-performance, and GPU-accelerated map engine for rendering large-scale, interactive maps.

import { S2PMTilesReader } from 'gis-tools/index.js';
import Source from './source.js';
/**
 * # S2 PMTiles Source
 *
 * Wrapper for the `S2PMTilesReader`. Fetch tiles as needed.
 */
export default class S2PMTilesSource extends Source {
    version = 1;
    reader;
    /** @param mapID - the id of the map to build tiles for */
    async build(mapID) {
        this.reader = new S2PMTilesReader(this.path, true);
        const metadata = await this.reader.getMetadata();
        // modify the type to ensure we are using a vector
        metadata.type = 'vector';
        this._buildMetadata(metadata, mapID);
    }
    /**
     * Here, we use the memory mapped file directory tree system to find our data
     * @param mapID - the id of the map
     * @param tile - the tile request
     * @param sourceName - the name of the source
     */
    async _tileRequest(mapID, tile, sourceName) {
        const { type, session, size } = this;
        const { parent, type: tileType } = tile;
        const { face, zoom, i, j } = parent ?? tile;
        const bytes = tileType === 'S2'
            ? await this.reader.getTileS2(face, zoom, i, j)
            : await this.reader.getTile(zoom, i, j);
        if (bytes !== undefined) {
            const data = bytes.buffer;
            const worker = session.requestWorker();
            worker.postMessage({ mapID, type, tile, sourceName, data, size }, [data]);
        }
        else {
            this._flush(mapID, tile, sourceName);
        }
    }
}