HarmonyOS Resource类型图片如何转换为ImageBitmap？（目前需要把图片放在ets目录下）

Canvas(this.context)  
  .width('100%')  
  .height('100%')  
  .backgroundColor('#ffff00')  
  .onReady(() => {  
    getContext(this).resourceManager.getMediaContent($r('app.media.product001')).then((data) => {  
      let arrayBuffer = data.buffer.slice(data.byteOffset, data.byteLength + data.byteOffset)  
      let imageSource: image.ImageSource = image.createImageSource(arrayBuffer);  
      imageSource.getImageInfo((err, value) => {  
        if (err) {  
          return;  
        }  
        let opts: image.DecodingOptions = {  
          editable: true,  
          desiredSize: {  
            height: value.size.height,  
            width: value.size.width  
          }  
        };  
        imageSource.createPixelMap(opts, (err, pixelMap) => {  
          // 这个回调的pixelMap就是当前图片的pixelMap  
          this.context.drawImage(pixelMap, 0, 0, 500, 500, 0, 0, 400, 200)  
        })  
      })  
    })  
  })