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