修改demo

entry/src/main/ets/pages/Index.ets

@@ -40,19 +40,9 @@ struct Index {
             uri: 'pages/TestCommonImage',
           });
         })
-        Button($r('app.string.Image_Downsampling_Functionality')).margin({top:10}).onClick(()=>{
+        Button(this.getResourceString($r('app.string.Multiple_images')) + " + reuse + LazyForeach").margin({top:10}).onClick(()=>{
           router.push({
-            uri: 'pages/DownSamplePage',
+            uri: 'pages/UserPage',
-          });
-        })
-        Button($r('app.string.Test_Task_error')).margin({top:10}).onClick(()=>{
-          router.push({
-            uri: 'pages/TestTaskResourcePage',
-          });
-        })
-        Button($r('app.string.Test_HSP')).margin({top:10}).onClick(()=>{
-          router.push({
-            uri: 'pages/TestHspPreLoadImage',
 
           });
         })
@@ -62,22 +52,9 @@ struct Index {
 
           });
         })
-        Button($r('app.string.Test_custom_download')).margin({top:10}).onClick(()=>{
+        Button($r('app.string.Image_Downsampling_Functionality')).margin({top:10}).onClick(()=>{
           router.push({
-            uri: 'pages/TestSetCustomImagePage',
+            uri: 'pages/DownSamplePage',
-
-          });
-        })
-        Button(this.getResourceString($r('app.string.Multiple_images')) + " + LazyForEach").margin({top:10}).onClick(()=>{
-          router.push({
-            uri: 'pages/ManyPhotoShowPage',
-
-          });
-        })
-        Button(this.getResourceString($r('app.string.Multiple_images')) + " + reuse + LazyForeach").margin({top:10}).onClick(()=>{
-          router.push({
-            uri: 'pages/UserPage',
-
           });
         })
         Button($r('app.string.Display_long_image')).margin({top:10}).onClick(()=>{
@@ -86,17 +63,25 @@ struct Index {
 
           });
         })
-        Button($r('app.string.Image_scaling')).margin({top:10}).onClick(()=>{
+        Button($r('app.string.Image_Transformation')).margin({top:10}).onClick(()=>{
           router.push({
-            uri: 'pages/TransformPage',
+            uri: 'pages/ImageTransformation',
+
+          });
+
+        })
+        Button($r('app.string.Test_media_URL')).margin({top:10}).onClick(()=>{
+          router.push({
+            uri: 'pages/dataShareUriLoadPage',
 
           });
         })
-        Button(this.getResourceString($r('app.string.Message_list')) + " + List").margin({top:10}).onClick(()=>{
+        Button($r('app.string.Different_ObjectFit')).margin({top:10}).onClick(()=>{
           router.push({
-            uri: 'pages/TestImageFlash',
+            uri: 'pages/ObjectFitPage',
 
           });
+
         })
         Button($r('app.string.Custom_cache_key')).margin({top:10}).onClick(()=>{
           router.push({
@@ -104,6 +89,39 @@ struct Index {
 
           });
         })
+        Button($r('app.string.Test_image_loading_success_or_failure_events')).margin({top:10}).onClick(()=>{
+          router.push({
+            uri: 'pages/LoadStatePage',
+          })
+        })
+        Button($r('app.string.Image_scaling')).margin({top:10}).onClick(()=>{
+          router.push({
+            uri: 'pages/TransformPage',
+
+          });
+        })
+
+        Button($r('app.string.Test_HSP')).margin({top:10}).onClick(()=>{
+          router.push({
+            uri: 'pages/TestHspPreLoadImage',
+
+          });
+        })
+
+        Button($r('app.string.Test_custom_download')).margin({top:10}).onClick(()=>{
+          router.push({
+            uri: 'pages/TestSetCustomImagePage',
+
+          });
+        })
+
+        Button(this.getResourceString($r('app.string.Message_list')) + " + List").margin({top:10}).onClick(()=>{
+          router.push({
+            uri: 'pages/TestImageFlash',
+
+          });
+        })
+
         Button($r('app.string.Preloading_images_to_cache')).margin({top:10}).onClick(()=>{
           router.push({
             uri: 'pages/TestPrefetchToFileCache',
@@ -128,27 +146,7 @@ struct Index {
 
           });
         })
-        Button($r('app.string.Image_Transformation')).margin({top:10}).onClick(()=>{
-          router.push({
-            uri: 'pages/ImageTransformation',
 
-          });
-
-        })
-
-        Button($r('app.string.Different_ObjectFit')).margin({top:10}).onClick(()=>{
-          router.push({
-            uri: 'pages/ObjectFitPage',
-
-          });
-
-        })
-
-        Button($r('app.string.Test_image_loading_success_or_failure_events')).margin({top:10}).onClick(()=>{
-          router.push({
-            uri: 'pages/LoadStatePage',
-          })
-        })
 
         Button($r('app.string.Test_removing_image_cache_interface')).margin({top:10}).onClick(()=>{
           router.push({
@@ -161,13 +159,11 @@ struct Index {
 
           });
         })
-        Button($r('app.string.Test_media_URL')).margin({top:10}).onClick(()=>{
+        Button($r('app.string.Test_Task_error')).margin({top:10}).onClick(()=>{
           router.push({
-            uri: 'pages/dataShareUriLoadPage',
+            uri: 'pages/TestTaskResourcePage',
-
           });
         })
-
       }
     } .width('100%')
     .height('100%')

library/src/main/ets/downsampling/DownsampleStartegy.ets

@@ -79,7 +79,7 @@ export class AtMost implements BaseDownsampling {
       greaterOrEqualSampleSize = lesserOrEqualSampleSize <<= 1;
     }
     greaterOrEqualSampleSize = lesserOrEqualSampleSize << (lesserOrEqualSampleSize < maxIntegerFactor ? 1 : 0)
-    //返回缩放因子
+
     let outSize: Size = {
       width: round((1 / greaterOrEqualSampleSize) * sourceWidth),
       height:round((1 / greaterOrEqualSampleSize) * sourceHeight)