相机分段式拍照性能优化

XComponent({
  type: XComponentType.SURFACE,
  controller: this.mXComponentController,
  imageAIOptions: this.options
})
  .onLoad(async () => {
    Logger.info(TAG, 'onLoad is called');
    this.surfaceId = this.mXComponentController.getXComponentSurfaceId();
    GlobalContext.get().setObject('cameraDeviceIndex', this.defaultCameraDeviceIndex);
    GlobalContext.get().setObject('xComponentSurfaceId', this.surfaceId);
    Logger.info(TAG, `onLoad surfaceId: ${this.surfaceId}`);
    await CameraService.initCamera(this.surfaceId, this.defaultCameraDeviceIndex);
  })
  .border({
    width: {
      top: Constants.X_COMPONENT_BORDER_WIDTH,
      bottom: Constants.X_COMPONENT_BORDER_WIDTH
    },
    color: Color.Black
  })
  .width('100%')
  .height(523)
  .margin({ top: 75, bottom: 72 })

/**
 * Initialize Camera Functions
 * @param surfaceId - Surface ID
 * @param cameraDeviceIndex - Camera Device Index
 * @returns No return value
 */
async initCamera(surfaceId: string, cameraDeviceIndex: number): Promise<void> {
  Logger.debug(TAG, `initCamera cameraDeviceIndex: ${cameraDeviceIndex}`);
  this.photoMode = AppStorage.get('photoMode');
  if (!this.photoMode) {
    return;
  }
  try {
    await this.releaseCamera();
    // Get Camera Manager Instance
    this.cameraManager = this.getCameraManagerFn();
    if (this.cameraManager === undefined) {
      Logger.error(TAG, 'cameraManager is undefined');
      return;
    }
    // Gets the camera device object that supports the specified
    this.cameras = this.getSupportedCamerasFn(this.cameraManager);
    if (this.cameras.length < 1 || this.cameras.length < cameraDeviceIndex + 1) {
      return;
    }
    this.curCameraDevice = this.cameras[cameraDeviceIndex];
    let isSupported = this.isSupportedSceneMode(this.cameraManager, this.curCameraDevice);
    if (!isSupported) {
      Logger.error(TAG, 'The current scene mode is not supported.');
      return;
    }
    let cameraOutputCapability =
      this.cameraManager.getSupportedOutputCapability(this.curCameraDevice, this.curSceneMode);
    let previewProfile = this.getPreviewProfile(cameraOutputCapability);
    if (previewProfile === undefined) {
      Logger.error(TAG, 'The resolution of the current preview stream is not supported.');
      return;
    }
    this.previewProfileObj = previewProfile;
    // Creates the previewOutput output object
    this.previewOutput = this.createPreviewOutputFn(this.cameraManager, this.previewProfileObj, surfaceId);
    if (this.previewOutput === undefined) {
      Logger.error(TAG, 'Failed to create the preview stream.');
      return;
    }
    // Listening for preview events
    this.previewOutputCallBack(this.previewOutput);
    let photoProfile = this.getPhotoProfile(cameraOutputCapability);
    if (photoProfile === undefined) {
      Logger.error(TAG, 'The resolution of the current photo stream is not supported.');
      return;
    }
    this.photoProfileObj = photoProfile;
    // Creates a photoOutPut output object
    this.photoOutput = this.createPhotoOutputFn(this.cameraManager, this.photoProfileObj);
    if (this.photoOutput === undefined) {
      Logger.error(TAG, 'Failed to create the photo stream.');
      return;
    }
    // Creates a cameraInput output object
    this.cameraInput = this.createCameraInputFn(this.cameraManager, this.curCameraDevice);
    if (this.cameraInput === undefined) {
      Logger.error(TAG, 'Failed to create the camera input.');
      return;
    }
    // Turn on the camera
    let isOpenSuccess = await this.cameraInputOpenFn(this.cameraInput);
    if (!isOpenSuccess) {
      Logger.error(TAG, 'Failed to open the camera.');
      return;
    }
    // Camera status callback
    this.onCameraStatusChange(this.cameraManager);
    // Listens to CameraInput error events
    this.onCameraInputChange(this.cameraInput, this.curCameraDevice);
    // Session Process
    await this.sessionFlowFn(this.cameraManager, this.cameraInput, this.previewOutput, this.photoOutput);
  } catch (error) {
    let err = error as BusinessError;
    Logger.error(TAG, `initCamera fail: ${JSON.stringify(err)}`);
  }
}

/**
 * Creates a photoOutPut output object
 */
createPhotoOutputFn(cameraManager: camera.CameraManager,
  photoProfileObj: camera.Profile): camera.PhotoOutput | undefined {
  let photoOutput: camera.PhotoOutput;
  try {
    photoOutput = cameraManager.createPhotoOutput(photoProfileObj);
    Logger.info(TAG, `createPhotoOutputFn success: ${photoOutput}`);
    return photoOutput;
  } catch (error) {
    let err = error as BusinessError;
    Logger.error(TAG, `createPhotoOutputFn failed: ${JSON.stringify(err)}`);
    return undefined;
  }
}

/**
 * Trigger a photo taking based on the specified parameters
 */
async takePicture(): Promise<void> {
  Logger.info(TAG, 'takePicture start');
  let cameraDeviceIndex = GlobalContext.get().getT<number>('cameraDeviceIndex');
  let photoSettings: camera.PhotoCaptureSetting = {
    quality: camera.QualityLevel.QUALITY_LEVEL_HIGH,
    mirror: cameraDeviceIndex ? true : false
  };
  try {
    await this.photoOutput?.capture(photoSettings);
    Logger.info(TAG, 'takePicture end');
  } catch (error) {
    let err = error as BusinessError;
    Logger.warn('testTag', `capture failed, code=${err.code}, message=${err.message}`);
  }
}

photoOutput.on('photoAvailable', (err: BusinessError, photo: camera.Photo) => {
  Logger.info(TAG, 'photoAvailable begin');
  if (err) {
    Logger.error(TAG, `photoAvailable err:${err.code}`);
    return;
  }
  let imageObj: image.Image = photo.main;
  imageObj.getComponent(image.ComponentType.JPEG, (err: BusinessError, component: image.Component) => {
    Logger.info(TAG, `getComponent start`);
    if (err) {
      Logger.error(TAG, `getComponent err:${err.code}`);
      return;
    }
    let buffer: ArrayBuffer = component.byteBuffer;
    let imageSource: image.ImageSource = image.createImageSource(buffer);
    imageSource.createPixelMap((err: BusinessError, pixelMap: image.PixelMap) => {
      if (err) {
        Logger.error(TAG, `createPixelMap err:${err.code}`);
        return;
      }
      this.handlePhotoAssetCb(pixelMap);
    });

  });
})

handleSavePicture = (photoAsset: photoAccessHelper.PhotoAsset | image.PixelMap): void => {
  Logger.info(TAG, 'handleSavePicture');
  this.setImageInfo(photoAsset);
  AppStorage.set<boolean>('isOpenEditPage', true);
  Logger.info(TAG, 'setImageInfo end');
}

setImageInfo(photoAsset: photoAccessHelper.PhotoAsset | image.PixelMap): void {
  Logger.info(TAG, 'setImageInfo');
  GlobalContext.get().setObject('photoAsset', photoAsset);
}

photoOutput.on('photoAssetAvailable', (err: BusinessError, photoAsset: photoAccessHelper.PhotoAsset) => {
  Logger.info(TAG, 'photoAssetAvailable begin');
  if (err) {
    Logger.error(TAG, `photoAssetAvailable err:${err.code}`);
    return;
  }
  this.handlePhotoAssetCb(photoAsset);
});

photoBufferCallback: (arrayBuffer: ArrayBuffer) => void = (arrayBuffer: ArrayBuffer) => {
  Logger.info(TAG, 'photoBufferCallback is called');
  let imageSource = image.createImageSource(arrayBuffer);
  imageSource.createPixelMap((err: BusinessError, data: image.PixelMap) => {
    if (err) {
      Logger.info(TAG, `createPixelMap err:${err.code}`);
      return;
    }
    Logger.info(TAG, 'createPixelMap is called');
    this.curPixelMap = data;
  });
};

requestImage(requestImageParams: RequestImageParams): void {
  class MediaDataHandler implements photoAccessHelper.MediaAssetDataHandler<ArrayBuffer> {
    onDataPrepared(data: ArrayBuffer, map: Map<string, string>): void {
      Logger.info(TAG, 'onDataPrepared map' + JSON.stringify(map));
      requestImageParams.callback(data);
      Logger.info(TAG, 'onDataPrepared end');
    }
  };
  let requestOptions: photoAccessHelper.RequestOptions = {
    deliveryMode: photoAccessHelper.DeliveryMode.BALANCE_MODE,
  };
  const handler = new MediaDataHandler();
  photoAccessHelper.MediaAssetManager.requestImageData(requestImageParams.context, requestImageParams.photoAsset,
    requestOptions, handler)
    .then(() => {
      Logger.info(TAG, 'requestImageData success');
    })
    .catch((err: BusinessError) => {
      Logger.error(TAG, `requestImageData failed, code=${err.code}, message=${err.message}`)
    })
}

aboutToAppear() {
  Logger.info(TAG, 'aboutToAppear begin');
  if (this.photoMode === Constants.SUBSECTION_MODE) {
    let curPhotoAsset = GlobalContext.get().getT<photoAccessHelper.PhotoAsset>('photoAsset');
    this.photoUri = curPhotoAsset.uri;
    let requestImageParams: RequestImageParams = {
      context: this.getUIContext().getHostContext(),
      photoAsset: curPhotoAsset,
      callback: this.photoBufferCallback
    };
    this.requestImage(requestImageParams);
    Logger.info(TAG, `aboutToAppear photoUri: ${this.photoUri}`);
  } else if (this.photoMode === Constants.SINGLE_STAGE_MODE) {
    this.curPixelMap = GlobalContext.get().getT<image.PixelMap>('photoAsset');
  }
}