fill-worker-01.ts

onmessage = (e: MessageEvent) => {
  const messageType: FillWorkerMessageType = e.data.type;

  switch (messageType) {
    case FillWorkerMessageType.InitialData:
      appFillData = e.data.appFillData;
      canvasWidth = e.data.width;
      canvasHeight = e.data.height;
      break;

    case FillWorkerMessageType.StartFill:
      // allocating new memory
      canvasImageData = new ImageData(canvasWidth, canvasHeight);
      break;

    case FillWorkerMessageType.FillStrips:
      fillStrips(e.data.fillStrips);
      break;

    case FillWorkerMessageType.EndFill:
      const arrayBuffer = canvasImageData.data.buffer;
      postMessage(arrayBuffer, [arrayBuffer]);
      break;

    default:
      console.error('Unknown worker message type', messageType);
  }
};