@gmod/bbi/dist/bigwig.js

Parser for BigWig/BigBed files

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.BigWig = void 0;
const bbi_ts_1 = require("./bbi.js");
const block_view_ts_1 = require("./block-view.js");
class BigWig extends bbi_ts_1.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];
            // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
            if (zh && zh.reductionLevel <= 2 * basesPerPx) {
                return new block_view_ts_1.BlockView(this.bbi, refsByName, zh.indexOffset, uncompressBufSize > 0, 'summary');
            }
        }
        return this.getUnzoomedView(opts);
    }
}
exports.BigWig = BigWig;
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