如何避免预览流产生畸变

//预览流与录像输出流的分辨率的宽高比要保持一致 
let previewProfilesArray: Array<camera.Profile> = cameraOutputCap.previewProfiles; 
 
let position: number = 0; 
if (previewProfilesArray != null) { 
  previewProfilesArray.forEach((value: camera.Profile, index: number) => { 
    // 查看支持的预览尺寸 
    console.info(TAG, `支持的预览尺寸: [${value.size.width},${value.size.height},${value.size.width / value.size.height }]`); 
    if (value.size.width === 2592 && value.size.height === 1200) { 
      position = index; 
    } 
  }) 
} else { 
  console.error(TAG, "createOutput photoProfilesArray == null || undefined"); 
} 
 
let photoProfilesArray: Array<camera.Profile> = cameraOutputCap.photoProfiles; 
if (!photoProfilesArray) { 
  console.error(TAG, "createOutput photoProfilesArray == null || undefined"); 
} 
 
this.xComponentWidth = previewProfilesArray[position].size.width; 
this.xComponentHeight = previewProfilesArray[position].size.height; 
 
this.mXComponentController.setXComponentSurfaceSize({ 
  surfaceWidth: this.xComponentWidth, 
  surfaceHeight: this.xComponentHeight 
}); 
// 创建预览输出流,其中参数 surfaceId 参考上文 XComponent 组件，预览流为XComponent组件提供的surface 
try { 
  previewOutput = cameraManager.createPreviewOutput(previewProfilesArray[position], surfaceId); 
} catch (error) { 
  let err = error as BusinessError; 
  console.error(TAG, `Failed to create the PreviewOutput instance. error code: ${err.code}`); 
} 
if (previewOutput === undefined) { 
  return; 
} 
 
// 监听预览输出错误信息 
previewOutput.on('error', (error: BusinessError) => { 
  console.error(TAG, `Preview output error code: ${error.code}`); 
}); 
 
// 创建ImageReceiver对象，并设置照片参数：分辨率大小是根据前面 photoProfilesArray 获取的当前设备所支持的拍照分辨率大小去设置 
let imageReceiver: image.ImageReceiver = image.createImageReceiver(2592, 1200, 4, 8);