降采样代码简化

Signed-off-by: tsm <tianshuangming@h-partners.com>

library/src/main/ets/ImageKnifeDispatcher.ets

@@ -35,6 +35,7 @@ import {
 } from './model/ImageKnifeData'
 import { BusinessError } from '@kit.BasicServicesKit';
 import { ImageKnifeLoader } from './ImageKnifeLoader'
+import { DownsampleStrategy } from './downsampling/DownsampleStartegy';
 
 
 export class ImageKnifeDispatcher {
@@ -186,7 +187,7 @@ export class ImageKnifeDispatcher {
       resName: resName == "" ? undefined : resName,
       targetWidth: currentRequest.componentWidth,
       targetHeight: currentRequest.componentHeight,
-      downsampType: currentRequest.imageKnifeOption.downsampleOf,
+      downsampType: currentRequest.imageKnifeOption.downsampleOf==undefined?DownsampleStrategy.NONE:currentRequest.imageKnifeOption.downsampleOf,
     }
 
     if(request.customGetImage == undefined) {

library/src/main/ets/model/ImageKnifeData.ets

@@ -107,6 +107,6 @@ export interface RequestJobRequest {
   resName?: string,
   targetWidth: number
   targetHeight: number
-  downsampType?: DownsampleStrategy
+  downsampType: DownsampleStrategy
 }