@loaders.gl/pmtiles/dist/pmtiles-loader.js

Framework-independent loader for the pmtiles format

// loaders.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors
import { BlobFile } from '@loaders.gl/loader-utils';
import { VERSION } from "./lib/version.js";
import { PMTilesTileSource } from "./pmtiles-source.js";
/**
 * Loader for PMTiles metadata
 * @note This loader is intended to allow PMTiles to be treated like other file types in top-level loading logic.
 * @note For actual access to the tile data, use the PMTilesSource class.
 */
export const PMTilesLoader = {
    name: 'PMTiles',
    id: 'pmtiles',
    module: 'pmtiles',
    version: VERSION,
    extensions: ['pmtiles'],
    mimeTypes: ['application/octet-stream'],
    tests: ['PMTiles'],
    options: {
        pmtiles: {}
    },
    parse: async (arrayBuffer, options) => parseFileAsPMTiles(new BlobFile(new Blob([arrayBuffer])), options),
    parseFile: parseFileAsPMTiles
};
async function parseFileAsPMTiles(file, options) {
    const source = new PMTilesTileSource(file.handle, {
        pmtiles: options?.pmtiles || {}
    });
    const formatSpecificMetadata = await source.getMetadata();
    const { tileMIMEType, tilejson = {} } = formatSpecificMetadata;
    const { layers = [] } = tilejson;
    switch (tileMIMEType) {
        case 'application/vnd.mapbox-vector-tile':
            return {
                shape: 'vector-source',
                layers: layers.map((layer) => ({ name: layer.name, schema: layer.schema })),
                tables: [],
                formatSpecificMetadata
            };
        case 'image/png':
        case 'image/jpeg':
            return { shape: 'image-source', formatSpecificMetadata };
        default:
            throw new Error(`PMTilesLoader: Unsupported tile MIME type ${tileMIMEType}`);
    }
}