mirror of https://github.com/vector-im/riot-web
60 lines
1.8 KiB
TypeScript
60 lines
1.8 KiB
TypeScript
/*
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Copyright 2021 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import { defer, IDeferred } from "matrix-js-sdk/src/utils";
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// @ts-ignore - `.ts` is needed here to make TS happy
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import BlurhashWorker from "./workers/blurhash.worker.ts";
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interface IBlurhashWorkerResponse {
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seq: number;
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blurhash: string;
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}
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export class BlurhashEncoder {
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private static internalInstance = new BlurhashEncoder();
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public static get instance(): BlurhashEncoder {
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return BlurhashEncoder.internalInstance;
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}
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private readonly worker: Worker;
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private seq = 0;
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private pendingDeferredMap = new Map<number, IDeferred<string>>();
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public constructor() {
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this.worker = new BlurhashWorker();
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this.worker.onmessage = this.onMessage;
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}
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private onMessage = (ev: MessageEvent<IBlurhashWorkerResponse>): void => {
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const { seq, blurhash } = ev.data;
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const deferred = this.pendingDeferredMap.get(seq);
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if (deferred) {
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this.pendingDeferredMap.delete(seq);
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deferred.resolve(blurhash);
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}
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};
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public getBlurhash(imageData: ImageData): Promise<string> {
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const seq = this.seq++;
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const deferred = defer<string>();
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this.pendingDeferredMap.set(seq, deferred);
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this.worker.postMessage({ seq, imageData });
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return deferred.promise;
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}
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}
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