修改demo

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

entry/src/main/ets/pages/DownSamplePage.ets

@@ -126,16 +126,20 @@ struct DownSamplePage {
       desiredPixelFormat: 3,
     }
     let imageInfo = await imageSource.getImageInfo()
-    let reqSize =
-      new Downsampler().calculateScaling(typeValue, imageInfo.size.width, imageInfo.size.height, 300,
-        300, this.imageKnifeOption.downsampleOf)
-    decodingOptions = {
-      editable: true,
-      desiredSize: {
-        width: reqSize.width,
-        height: reqSize.height
+
+    if (this.imageKnifeOption.downsampleOf !== DownsampleStrategy.NONE){
+      let reqSize =
+        new Downsampler().calculateScaling(typeValue, imageInfo.size.width, imageInfo.size.height, 300,
+          300, this.imageKnifeOption.downsampleOf)
+      decodingOptions = {
+        editable: true,
+        desiredSize: {
+          width: reqSize.width,
+          height: reqSize.height
+        }
       }
     }
+
     // 创建pixelMap
     imageSource.createPixelMap(decodingOptions).then((pixelMap: image.PixelMap) => {
       this.afterSampling = pixelMap.getPixelBytesNumber()

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',
-          });
-        })
-        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',
+            uri: 'pages/UserPage',
 
           });
         })
@@ -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',
-
-          });
-        })
-        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',
-
+            uri: 'pages/DownSamplePage',
           });
         })
         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/ImageKnifeLoader.ets

@@ -388,28 +388,28 @@ export class ImageKnifeLoader {
     return resBuf
   }
 
-  static downsamplerReqSize(typeValue: string, request: RequestJobRequest, size: Size,
-    SRC?: ImageKnifeRequestSource) {
+    static downsamplerReqSize(typeValue: string, request: RequestJobRequest, size: Size,
+    SRC?: ImageKnifeRequestSource):image.DecodingOptions {
     let reqSize =
       new Downsampler().calculateScaling(typeValue, size.width, size.height, request.targetWidth, request.targetHeight,
         request.downsampType)
     if (typeValue == "svg") {
-      return ({
+      return {
         editable: true,
-        desiredSize: ({
+        desiredSize: {
           height: vp2px(reqSize.height),
           width: vp2px(reqSize.width)
-        } as Size)
+        }
 
-      } as image.DecodingOptions)
+      }
     } else {
-      return ({
+      return {
         editable: request.requestSource === SRC && request.transformation !== undefined ? true : false,
-        desiredSize: ({
+        desiredSize:{
           width: reqSize.width,
           height: reqSize.height
-        } as Size)
-      } as image.DecodingOptions)
+        }
+      }
     }
   }
 }

library/src/main/ets/downsampling/BaseDownsampling.ets

@@ -20,7 +20,4 @@ export interface BaseDownsampling {
   getName(): string
 
   getScaleFactor(sourceWidth: number, sourceHeight: number, requestWidth: number, requestHeight: number,downsampType?:DownsampleStrategy): number
-  //
-  getSampleSizeType(sourceWidth: number, sourceHeight: number, requestWidth: number,
-    requestHeight: number,downsampType?:DownsampleStrategy): SampleSizeRounding
 }

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

@@ -28,50 +28,16 @@ export class FitCenter implements BaseDownsampling {
       width: round(getScale(sourceWidth, sourceHeight, requestedWidth, requestedHeight, downsampType) * sourceWidth),
       height:round(getScale(sourceWidth, sourceHeight, requestedWidth, requestedHeight, downsampType) * sourceHeight)
     }
-    let scaleFactor = this.getSampleSizeType(sourceWidth, sourceHeight, requestedWidth, requestedHeight, downsampType)===
-    SampleSizeRounding.QUALITY? Math.max(1, highestOneBit(Math.max(sourceWidth / outSize.width, sourceHeight / outSize.height))) :
+    let scaleFactor = downsampType === DownsampleStrategy.FIT_CENTER_QUALITY?
+    Math.max(1, highestOneBit(Math.max(sourceWidth / outSize.width, sourceHeight / outSize.height))) :
     Math.max(1, highestOneBit(Math.min(sourceWidth / outSize.width, sourceHeight / outSize.height)))//将整型的缩放因子转换为2的次幂采样大小
 
-    if (this.getSampleSizeType(sourceWidth, sourceHeight, requestedWidth, requestedHeight, downsampType)===
-    SampleSizeRounding.MEMORY && (scaleFactor < (1 / getScale(sourceWidth, sourceHeight, requestedWidth, requestedHeight, downsampType)))) {
+    if (downsampType === DownsampleStrategy.FIT_CENTER_MEMORY
+      && (scaleFactor < (1 / getScale(sourceWidth, sourceHeight, requestedWidth, requestedHeight, downsampType)))) {
       scaleFactor = scaleFactor << 1;
     }
     return scaleFactor
   }
-
-  getSampleSizeType(sourceWidth: number, sourceHeight: number, requestedWidth: number, requestedHeight: number,
-    downsampType: DownsampleStrategy
-  ): number {
-    if (downsampType === DownsampleStrategy.FIT_CENTER_QUALITY) {
-      return SampleSizeRounding.QUALITY;
-    } else {
-      return SampleSizeRounding.MEMORY;
-    }
-
-  }
-}
-
-export class None implements BaseDownsampling {
-  getName(): string {
-    return "DownsampleNone"
-  }
-
-  public getScaleFactor(sourceWidth: number, sourceHeight: number, requestedWidth: number,
-    requestedHeight: number): number {
-    let outSize: Size = {
-      width: round(sourceWidth),
-      height:round(sourceHeight)
-    }
-    let scaleFactor =
-      Math.max(1, highestOneBit(Math.max(sourceWidth / outSize.width, sourceHeight / outSize.height)))
-    return scaleFactor
-  }
-
-  //实现 getSampleSizeType 方法
-  public getSampleSizeType(sourceWidth: number, sourceHeight: number, requestedWidth: number,
-    requestedHeight: number): SampleSizeRounding {
-    return SampleSizeRounding.QUALITY
-  }
 }
 
 
@@ -95,11 +61,6 @@ export class CenterOutside implements BaseDownsampling {
 
     return scaleFactor
   }
-
-  getSampleSizeType(sourceWidth: number, sourceHeight: number, requestedWidth: number,
-    requestedHeight: number): SampleSizeRounding {
-    return SampleSizeRounding.QUALITY;
-  }
 }
 
 /*请求尺寸大于实际尺寸不进行放大,按照原图展示*/
@@ -118,7 +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)
@@ -129,13 +90,6 @@ export class AtMost implements BaseDownsampling {
     }
     return scaleFactor
   }
-
-
-  getSampleSizeType(sourceWidth: number, sourceHeight: number, requestedWidth: number,
-    requestHeight: number): SampleSizeRounding {
-    //根据 AtMost 的逻辑，总是返回 MEMORY
-    return SampleSizeRounding.MEMORY
-  }
 }
 
 /*宽高进行等比缩放宽高里面最大的比例先放进去
@@ -147,7 +101,6 @@ export class CenterInside implements BaseDownsampling {
   getScaleFactor(sourceWidth: number, sourceHeight: number, requestedWidth: number, requestedHeight: number,
     downsampType: DownsampleStrategy
   ): number {
-
     let outSize: Size = {
       width: round(Math.min(1, getScale(sourceWidth, sourceHeight, requestedWidth, requestedHeight, downsampType)) * sourceWidth),
       height:round(Math.min(1, getScale(sourceWidth, sourceHeight, requestedWidth, requestedHeight, downsampType)) * sourceHeight)
@@ -173,17 +126,7 @@ export class CenterInside implements BaseDownsampling {
       return SampleSizeRounding.QUALITY
     }
     //否则，使用 FIL_CENTER 的 SampleSizeRounding 值
-    return this.getSampleSize(sourceWidth, sourceHeight, requestedWidth, requestedHeight, downsampType);
-  }
-
-  getSampleSize(sourceWidth: number, sourceHeight: number, requestedWidth: number, requestedHeight: number,
-    downsampType: DownsampleStrategy
-  ): SampleSizeRounding {
-    if (downsampType === DownsampleStrategy.CENTER_INSIDE_MEMORY) {
-      return SampleSizeRounding.MEMORY;
-    } else {
-      return SampleSizeRounding.QUALITY;
-    }
+    return downsampType === DownsampleStrategy.CENTER_INSIDE_MEMORY?SampleSizeRounding.MEMORY:SampleSizeRounding.QUALITY
   }
 }
 

library/src/main/ets/downsampling/DownsampleUtils.ets

@@ -28,7 +28,7 @@ export enum SampleSizeRounding {
   //（质量优先）
   QUALITY
 }
-
+//找出给定整数 i 中最高位的1（即最左边的1）所代表的值
 export function highestOneBit(i: number): number {
   i |= (i >> 1);
   i |= (i >> 2);
@@ -52,6 +52,7 @@ export function getScale(sourceWidth: number, sourceHeight: number, requestedWid
 
   }
 }
+//四舍五入
 export function  round(value: number): number {
   return Math.floor(value + 0.5);
 }

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 {
@@ -74,14 +54,11 @@ export class Downsampler {
       }
     }
   }
-
   getDownsampler(downsampType: DownsampleStrategy) {
     switch (downsampType) {
       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: