HarmonyOS image的pixelmap如何进行深拷贝

参考demo：

import { AttributeUpdater } from '@kit.ArkUI';
import { image } from '@kit.ImageKit';

@Entry
@Component
struct CacheTest {
  build() {
    Column() {
      ReusableImageComponent({
        resource: $r('app.media.background')
      })
        .width('100%')
        .height(100)
    }
    .width('100%')
    .height('100%')
    .justifyContent(FlexAlign.Center)
  }
}

class MyImageAttributeModifier extends AttributeUpdater<ImageAttribute, ImageInterface> {
  initializeModifier(instance: ImageAttribute): void {
  }
}

@Reusable
@Component
struct ReusableImageComponent {
  @Prop resource: Resource
  @State imagePixelMap: image.PixelMap | undefined = undefined;
  @State imagePixelMap2: image.PixelMap | undefined = undefined
  private modifier: MyImageAttributeModifier = new MyImageAttributeModifier();

  private async getPixmapFromMedia(resource: Resource) {
    let unit8Array = await getContext(this)?.resourceManager?.getMediaContent({
      bundleName: resource.bundleName,
      moduleName: resource.moduleName,
      id: resource.id
    })
    let imageSource = image.createImageSource(unit8Array.buffer.slice(0, unit8Array.buffer.byteLength))
    let createPixelMap: image.PixelMap = await imageSource.createPixelMap({
      desiredPixelFormat: image.PixelMapFormat.RGB_565
    })
    await imageSource.release()
    return createPixelMap
  }

  async aboutToAppear() {
    this.imagePixelMap = await this.getPixmapFromMedia($r('app.media.poster1'))
    if (this.imagePixelMap) {
      let imageinfo = this.imagePixelMap.getImageInfoSync();
      let Format = 0;
      switch (imageinfo.pixelFormat) {
        case image.PixelMapFormat.RGB_565: {
          Format = 2;
          break;
        }
          ;
        case image.PixelMapFormat.RGBA_8888: {
          Format = 4;
          break;
        }
          ;
        case image.PixelMapFormat.BGRA_8888: {
          Format = 4;
          break;
        }
          ;
        case image.PixelMapFormat.RGB_888: {
          Format = 3;
          break;
        }
          ;
        case image.PixelMapFormat.ALPHA_8: {
          Format = 1;
          break;
        }
          ;
        case image.PixelMapFormat.RGBA_F16: {
          Format = 8;
          break;
        }
          ;
        case image.PixelMapFormat.NV21: {
          Format = 1.5;
          break;
        }
          ;
        case image.PixelMapFormat.NV12: {
          Format = 1.5;
          break;
        }
          ;
        default: {
          Format = 1;
          break;
        }
      }
      let array: ArrayBuffer = new ArrayBuffer(imageinfo.size.height * imageinfo.size.width * Format);
      this.imagePixelMap.readPixelsToBuffer(array);
      this.imagePixelMap2 = image.createPixelMapSync(array, {
        srcPixelFormat: imageinfo.pixelFormat,
        pixelFormat: imageinfo.pixelFormat,
        size: { width: imageinfo.size.width, height: imageinfo.size.height }
      })
      this.imagePixelMap2.flip(true, false);
    }
  }

  build() {
    Row() {
      Column() {
        Image($r('app.media.poster1'))
          .objectFit(ImageFit.Cover)
        Text('Raw picture')
      }.width('50%').height('100%')
      .margin({right: 5})

      Column() {
        Image(this.imagePixelMap2)
          .attributeModifier(this.modifier)
          .objectFit(ImageFit.Cover)
        Text('Copy picture')
      }.width('50%').height('100%')
      .margin({left: 5})
    }
    .width('100%')
    .height('100%')
  }
}