diff --git a/library/src/main/ets/downsampling/Downsampler.ets b/library/src/main/ets/downsampling/Downsampler.ets
index 1b7cdeb..4f15775 100644
--- a/library/src/main/ets/downsampling/Downsampler.ets
+++ b/library/src/main/ets/downsampling/Downsampler.ets
@@ -18,11 +18,7 @@ import {
   CenterOutside,
   DownsampleStrategy,
   FitCenter,
-  None,
 } from './DownsampleStartegy';
-import { highestOneBit, round, SampleSizeRounding } from './DownsampleUtils';
-
-
 export class Downsampler {
   calculateScaling(
     typeValue: string,
@@ -39,22 +35,6 @@ export class Downsampler {
     let downsampler = this.getDownsampler(downsampType);
     let scaleFactor: number =
       downsampler.getScaleFactor(sourceWidth, sourceHeight, requestWidth, requestHeight, downsampType);//缩放比
-    // let rounding: SampleSizeRounding =
-    //   downsampler.getSampleSizeType(sourceWidth, sourceHeight, requestWidth, requestHeight, downsampType); //采样类型
-    //根据缩放比重新计算宽高
-    // let outSize: Size = {
-    //   width: round(exactScaleFactor * sourceWidth),
-    //   height:round(exactScaleFactor * sourceHeight)
-    // }
-    // let scaleFactor =
-    //   rounding == SampleSizeRounding.QUALITY ? Math.max(sourceWidth / exactScaleFactor.width, sourceHeight / exactScaleFactor.height) :
-    //   Math.min(sourceWidth / exactScaleFactor.width, sourceHeight / exactScaleFactor.height) //重新计算宽高比
-
-    // scaleFactor = Math.max(1, highestOneBit(scaleFactor))//将整型的缩放因子转换为2的次幂采样大小
-    //
-    // if (rounding == 0 && (scaleFactor < (1 / exactScaleFactor))) {
-    //   scaleFactor = scaleFactor << 1;
-    // }
     //基于上一步得出的采样大小，根据不同的图片类型，计算采样后的图片尺寸
     if (typeValue === "png") {
       return {
@@ -80,8 +60,6 @@ export class Downsampler {
       case DownsampleStrategy.FIT_CENTER_MEMORY:
       case DownsampleStrategy.FIT_CENTER_QUALITY:
         return new FitCenter();
-      case DownsampleStrategy.NONE:
-        return new None();
       case DownsampleStrategy.AT_MOST:
         return new AtMost();
       case DownsampleStrategy.CENTER_INSIDE_MEMORY: