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worker-client.ts
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worker-client.ts
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import debounce from 'debounce';
import mitt from 'mitt';
import type { XIMGDiffConfig } from './types/reg';
import type {
WorkerEvent,
WorkerEventDataPayload,
WorkerEventDataPayloadMap,
} from './types/event';
import { WorkerEventType } from './types/event';
const fromCanvas = (img: HTMLImageElement): ImageData => {
const canvas = document.createElement('canvas');
const ctx = canvas.getContext('2d');
if (ctx == null) {
throw new Error('An unexpected error has occurred');
}
canvas.width = img.width;
canvas.height = img.height;
ctx.drawImage(img, 0, 0);
return ctx.getImageData(0, 0, canvas.width, canvas.height);
};
const loadImage = (src: string): Promise<ImageData> =>
new Promise((resolve) => {
const img = new Image();
img.addEventListener(
'load',
() => {
resolve(fromCanvas(img));
},
false,
);
img.src = src;
});
export class WorkerClient {
private _cache: {
[key: string]: WorkerEventDataPayload<WorkerEventType.RESULT_CALC>;
} = {};
private _ximgdiffEnabled = false;
private _seq = 0;
private _emitter = mitt<WorkerEventDataPayloadMap>();
private _worker: Worker | null = null;
public start(config: XIMGDiffConfig) {
if (!config.workerUrl) {
return;
}
this._ximgdiffEnabled = config.enabled;
this._worker = new Worker(config.workerUrl, {});
this._worker.addEventListener('message', ({ data }: WorkerEvent) => {
switch (data.type) {
case WorkerEventType.RESULT_CALC:
this._cache[data.payload.raw] = data.payload;
this._emitter.emit(WorkerEventType.RESULT_CALC, data.payload);
break;
case WorkerEventType.RESULT_FILTER:
this._emitter.emit(WorkerEventType.RESULT_FILTER, data.payload);
break;
}
});
}
public requestCalc(
payload: Pick<
WorkerEventDataPayload<WorkerEventType.REQUEST_CALC>,
'raw' | 'actualSrc' | 'expectedSrc'
>,
) {
if (!this._ximgdiffEnabled || this._worker == null) {
return 0;
}
const seq = ++this._seq;
if (this._cache[payload.raw]) {
setTimeout(
() =>
this._emitter.emit(WorkerEventType.RESULT_CALC, {
...this._cache[payload.raw],
seq,
}),
10,
);
return seq;
}
Promise.all([
loadImage(payload.actualSrc),
loadImage(payload.expectedSrc),
]).then(([img1, img2]) => {
(this._worker as Worker).postMessage(
{
type: WorkerEventType.REQUEST_CALC,
payload: {
img1,
img2,
seq,
...payload,
},
},
[img1.data.buffer, img2.data.buffer],
);
});
return seq;
}
public requestFilterInit(
payload: WorkerEventDataPayload<WorkerEventType.INIT_FILTER>,
) {
if (this._worker == null) {
return;
}
this._worker.postMessage({
type: WorkerEventType.INIT_FILTER,
payload,
});
}
public requestFilter = debounce(
(payload: WorkerEventDataPayload<WorkerEventType.REQUEST_FILTER>) => {
if (this._worker == null) {
return;
}
this._worker.postMessage({
type: WorkerEventType.REQUEST_FILTER,
payload,
});
},
200,
);
public subscribe<T extends WorkerEventType>(
type: T,
listener: (payload: WorkerEventDataPayload<T>) => void,
) {
this._emitter.on(type, listener);
}
public unsubscribe<T extends WorkerEventType>(
type: T,
listener: (payload: WorkerEventDataPayload<T>) => void,
) {
this._emitter.off(type, listener);
}
}