/* * Copyright (C) 2023 Yomitan Authors * Copyright (C) 2021-2022 Yomichan Authors * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <https://www.gnu.org/licenses/>. */ import {deserializeError, generateId} from '../core.js'; /** * Class used for loading and validating media from a worker thread * during the dictionary import process. */ export class DictionaryWorkerMediaLoader { /** * Creates a new instance of the media loader. */ constructor() { this._requests = new Map(); } /** * Handles a response message posted to the worker thread. * @param {{id: string, error: object|undefined, result: any|undefined}} params Details of the response. */ handleMessage(params) { const {id} = params; const request = this._requests.get(id); if (typeof request === 'undefined') { return; } this._requests.delete(id); const {error} = params; if (typeof error !== 'undefined') { request.reject(deserializeError(error)); } else { request.resolve(params.result); } } /** * Attempts to load an image using an ArrayBuffer and a media type to return details about it. * @param {ArrayBuffer} content The binary content for the image, encoded as an ArrayBuffer. * @param {string} mediaType The media type for the image content. * @returns {Promise<{content: ArrayBuffer, width: number, height: number}>} Details about the requested image content. * @throws {Error} An error can be thrown if the image fails to load. */ getImageDetails(content, mediaType) { return new Promise((resolve, reject) => { const id = generateId(16); this._requests.set(id, {resolve, reject}); self.postMessage({ action: 'getImageDetails', params: {id, content, mediaType} }, [content]); }); } }