@gmod/bbi/esm/bigwig.js

Parser for BigWig/BigBed files

import { BBI } from "./bbi.js";
import { BlockView } from "./block-view.js";
export class BigWig extends BBI {
    /**
     * Retrieves a BlockView of a specific zoomLevel
     *
     * @param scale - number
     *
     * @param opts - An object containing basesPerSpan (e.g. pixels per basepair)
     * or scale used to infer the zoomLevel to use
     */
    async getView(scale, opts) {
        const { zoomLevels, refsByName, uncompressBufSize } = await this.getHeader(opts);
        const basesPerPx = 1 / scale;
        const maxLevel = zoomLevels.length - 1;
        for (let i = maxLevel; i >= 0; i -= 1) {
            const zh = zoomLevels[i];
            if (zh && zh.reductionLevel <= 2 * basesPerPx) {
                return new BlockView(this.bbi, refsByName, zh.indexOffset, uncompressBufSize, 'summary');
            }
        }
        return this.getUnzoomedView(opts);
    }
}
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