HarmonyOS系统有没有把Base64字符串解码成图片的方法？

let that = new util.Base64Helper(); 
let base64 = 'iVBORw0KGgoxxxANSUhEUgAAAB4xxxxtCAMAAACOACuTAAAALVxxxxU03QE02QU48PEs0Q0s2QU42Qk43QE43QU03QU04P043QE43QVA3QU7fFG+6AAAADnRSTlMAu3fuESKPVd1mzESqM0jcJEgAAACOSURBVHjatZBJEsAgCARV3BP5/3Oj3mdIZZlrF9CMs+Jx2sSKE/7FIEMmzYimxxxxykA060xDtKipVelhLYiGRU+6WhJdHai1QK+6X6ZeFXYt9rBEOhzosCaqnfHPtO2TfpV0JXOxgXB/v5t7q0PZ1CN66I2+D3460q/lodkgpdjibeNm/fVtLk4YEK1O5uSkAAAAAElFTkSuQmCC'; 
let result:Uint8Array = that.decodeSync(base64, util.Type.MIME); 
let buf:ArrayBuffer = result.buffer as ArrayBuffer 
const imageSourceApi: image.ImageSource = image.createImageSource(buf); 
this.pixmap1=await imageSourceApi.createPixelMap()