降采样

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

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

@@ -0,0 +1,208 @@
+/*
+ * Copyright (C) 2024 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the 'License');
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an 'AS IS' BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { DownsampleStrategy, ImageKnifeOption, } from '@ohos/imageknife';
+import { ImageKnifeComponent, BlurTransformation, } from '@ohos/libraryimageknife';
+import { image } from '@kit.ImageKit';
+import { BusinessError } from '@kit.BasicServicesKit';
+import { Downsampler } from '@ohos/imageknife/src/main/ets/downsampling/Downsampler';
+import { FileTypeUtil } from '@ohos/imageknife/src/main/ets/utils/FileTypeUtil';
+
+@Entry
+@ComponentV2
+struct DownSamplePage {
+  @Local imageKnifeOption: ImageKnifeOption = new ImageKnifeOption( {
+    loadSrc: $r('app.media.startIcon'),
+    placeholderSrc: $r("app.media.loading"),
+    errorholderSrc: $r("app.media.app_icon"),
+    objectFit: ImageFit.Contain
+  })
+  isBrightness: boolean = false
+  @Local beforeSampling: number = 0
+  @Local afterSampling: number = 0
+  @Local SamplingList: SamplingType[] = [
+    new SamplingType(0, "NONE"),
+    new SamplingType(1, "AT_MOST"),
+    new SamplingType(2, "FIT_CENTER_MEMORY"),
+    new SamplingType(4, "FIT_CENTER_QUALITY"),
+    new SamplingType(5, "CENTER_INSIDE_MEMORY"),
+    new SamplingType(6, "CENTER_INSIDE_QUALITY"),
+    new SamplingType(7, "CENTER_OUTSIDE"),
+  ]
+  @Local checked: boolean = false
+
+  updateImageKnifeOption(value: string) {
+    if (value === 'NONE') {
+      this.imageKnifeOption =new ImageKnifeOption( {
+        loadSrc: $r('app.media.jpgSample'),
+        placeholderSrc: $r("app.media.loading"),
+        errorholderSrc: $r("app.media.app_icon"),
+        objectFit: ImageFit.Contain,
+        downsampleOf: DownsampleStrategy.NONE
+      })
+      this.originalPixMap($r('app.media.jpgSample'))
+      this.afterSamplingFunc($r('app.media.jpgSample'))
+    } else if (value === 'AT_MOST') {
+      this.imageKnifeOption =new ImageKnifeOption( {
+        loadSrc: $r('app.media.svgSample'),
+        placeholderSrc: $r("app.media.loading"),
+        errorholderSrc: $r("app.media.app_icon"),
+        objectFit: ImageFit.Contain,
+        downsampleOf: DownsampleStrategy.AT_MOST
+      })
+      this.originalPixMap($r('app.media.svgSample'))
+      this.afterSamplingFunc($r('app.media.svgSample'))
+    } else if (value === 'FIT_CENTER_MEMORY') {
+      this.imageKnifeOption =new ImageKnifeOption( {
+        loadSrc: $r('app.media.pngSample'),
+        placeholderSrc: $r("app.media.loading"),
+        errorholderSrc: $r("app.media.app_icon"),
+        objectFit: ImageFit.Contain,
+        downsampleOf: DownsampleStrategy.FIT_CENTER_MEMORY
+      })
+      this.originalPixMap($r('app.media.pngSample'))
+      this.afterSamplingFunc($r('app.media.pngSample'))
+    }
+    else if (value ==='FIT_CENTER_QUALITY') {
+      this.imageKnifeOption =new ImageKnifeOption( {
+        loadSrc: $r('app.media.pngSample'),
+        placeholderSrc: $r("app.media.loading"),
+        errorholderSrc: $r("app.media.app_icon"),
+        objectFit: ImageFit.Contain,
+        downsampleOf: DownsampleStrategy.FIT_CENTER_QUALITY
+      })
+      this.originalPixMap($r('app.media.pngSample'))
+      this.afterSamplingFunc($r('app.media.pngSample'))
+    }
+    else if (value === 'CENTER_INSIDE_MEMORY') {
+      this.imageKnifeOption = new ImageKnifeOption({
+        loadSrc: $r('app.media.jpgSample1'),
+        placeholderSrc: $r("app.media.loading"),
+        errorholderSrc: $r("app.media.app_icon"),
+        objectFit: ImageFit.Contain,
+        downsampleOf: DownsampleStrategy.CENTER_INSIDE_MEMORY
+      })
+      this.originalPixMap($r('app.media.jpgSample1'))
+      this.afterSamplingFunc($r('app.media.jpgSample1'))
+    }    else if (value === 'CENTER_INSIDE_QUALITY') {
+      this.imageKnifeOption = new ImageKnifeOption({
+        loadSrc: $r('app.media.jpgSample1'),
+        placeholderSrc: $r("app.media.loading"),
+        errorholderSrc: $r("app.media.app_icon"),
+        objectFit: ImageFit.Contain,
+        downsampleOf: DownsampleStrategy.CENTER_INSIDE_QUALITY
+      })
+      this.originalPixMap($r('app.media.jpgSample1'))
+      this.afterSamplingFunc($r('app.media.jpgSample1'))
+    }
+    else {
+      this.imageKnifeOption = new ImageKnifeOption({
+        loadSrc: $r('app.media.jpgSample2'),
+        placeholderSrc: $r("app.media.loading"),
+        errorholderSrc: $r("app.media.app_icon"),
+        objectFit: ImageFit.Contain,
+        downsampleOf: DownsampleStrategy.CENTER_OUTSIDE
+      })
+      this.originalPixMap($r('app.media.jpgSample2'))
+      this.afterSamplingFunc($r('app.media.jpgSample2'))
+    }
+  }
+
+  async afterSamplingFunc(imgs: Resource) {
+    let img: Uint8Array = await getContext(this).resourceManager.getMediaContent(imgs);
+    let imageSource: image.ImageSource = image.createImageSource(img.buffer.slice(0));
+    let fileTypeUtil = new FileTypeUtil();
+    let typeValue = fileTypeUtil.getFileType(img.buffer.slice(0));
+    let decodingOptions: image.DecodingOptions = {
+      editable: true,
+      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.targetWidth,
+        height: reqSize.targetHeight
+      }
+    }
+    // 创建pixelMap
+    imageSource.createPixelMap(decodingOptions).then((pixelMap: image.PixelMap) => {
+      this.afterSampling = pixelMap.getPixelBytesNumber()
+    }).catch((err: BusinessError) => {
+      console.error("Failed to create PixelMap")
+    });
+  }
+
+  async originalPixMap(imgs: Resource,) {
+    let img: Uint8Array = await getContext(this).resourceManager.getMediaContent(imgs);
+    let imageSource: image.ImageSource = image.createImageSource(img.buffer.slice(0));
+    let decodingOptions: image.DecodingOptions = {
+      editable: true,
+      desiredPixelFormat: 3,
+    }
+    // 创建pixelMap
+    imageSource.createPixelMap(decodingOptions).then((pixelMap: image.PixelMap) => {
+      this.beforeSampling = pixelMap.getPixelBytesNumber()
+    }).catch((err: BusinessError) => {
+      console.error("Failed to create PixelMap")
+    });
+  }
+
+  build() {
+    Scroll() {
+      Column() {
+        ForEach(this.SamplingList, (item: SamplingType, index) => {
+          Flex({ justifyContent: FlexAlign.Center, alignItems: ItemAlign.Center }) {
+            Radio({ value: item.value + 'radio', group: 'radioGroup' })
+              .height(50)
+              .width(50)
+              .checked(this.checked)
+              .onClick(() => {
+                this.updateImageKnifeOption(item.value)
+              })
+            Text("降采样规格：" + item.value).fontSize(20)
+          }
+        }, (item: SamplingType) => JSON.stringify(item))
+        Column() {
+          Text(`未降采样大小：${this.beforeSampling}`).fontSize(20)
+          Text(`降采样后大小：${this.afterSampling}`).fontSize(20)
+        }
+
+        ImageKnifeComponent({
+          imageKnifeOption: this.imageKnifeOption
+        })
+          .height(300)
+          .width(300)
+          .borderWidth(1)
+          .borderColor(Color.Pink)
+      }
+
+    }
+    .height('100%')
+    .width('100%')
+  }
+}
+
+class SamplingType {
+  key: number
+  value: string
+
+  constructor(key: number, value: string) {
+    this.key = key
+    this.value = value
+  }
+}

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

@@ -47,6 +47,11 @@ struct Index {
 
           });
         })
+        Button("降采样").margin({top:10}).onClick(() => {
+          router.push({
+            uri: 'pages/DownSamplePage',
+          });
+        })
         Button("单个图片使用").margin({top:10}).onClick(()=>{
           router.push({
             uri: 'pages/SingleImage',

entry/src/main/resources/base/profile/main_pages.json

@@ -23,6 +23,7 @@
     "pages/ImageAnimatorPage",
     "pages/TestSetCustomImagePage",
     "pages/TestErrorHolderPage",
-    "pages/TestTaskResourcePage"
+    "pages/TestTaskResourcePage",
+    "pages/DownSamplePage"
   ]
 }

entry/src/ohosTest/ets/test/List.test.ets

@@ -18,6 +18,7 @@ import ImageKnifeOptionTest from './ImageKnifeOption.test';
 import MemoryLruCacheTest from './MemoryLruCache.test';
 import ImageKnifeTest from './ImageKnife.test';
 import Transform from './transform.test';
+import SamplingTest from './SamplingTest.test';
 
 export default function testsuite() {
   MemoryLruCacheTest();
@@ -26,4 +27,5 @@ export default function testsuite() {
   ImageKnifeOptionTest();
   ImageKnifeTest();
   Transform();
+  SamplingTest()
 }

entry/src/ohosTest/ets/test/SamplingTest.test.ets

@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2024 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the 'License');
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an 'AS IS' BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { describe, beforeAll, beforeEach, afterEach, afterAll, it, expect } from '@ohos/hypium'
+import { image } from '@kit.ImageKit'
+import { BusinessError } from '@kit.BasicServicesKit'
+import { calculateScaleType, Downsampler } from '@ohos/imageknife/src/main/ets/downsampling/Downsampler'
+import { DownsampleStrategy } from '@ohos/imageknife'
+
+export default function SamplingTest() {
+  describe('SamplingTest', () => {
+    // Defines a test suite. Two parameters are supported: test suite name and test suite function.
+    beforeAll(() => {
+      // Presets an action, which is performed only once before all test cases of the test suite start.
+      // This API supports only one parameter: preset action function.
+    })
+    beforeEach(() => {
+      // Presets an action, which is performed before each unit test case starts.
+      // The number of execution times is the same as the number of test cases defined by **it**.
+      // This API supports only one parameter: preset action function.
+    })
+    afterEach(() => {
+      // Presets a clear action, which is performed after each unit test case ends.
+      // The number of execution times is the same as the number of test cases defined by **it**.
+      // This API supports only one parameter: clear action function.
+    })
+    afterAll(() => {
+      // Presets a clear action, which is performed after all test cases of the test suite end.
+      // This API supports only one parameter: clear action function.
+    })
+    it('NONE', 0, () => {
+      let reqSize: calculateScaleType =
+        new Downsampler().calculateScaling('jpg', 1024, 1024, 200,
+          200, DownsampleStrategy.NONE, false)
+      let req = (reqSize.targetWidth == 1024 && reqSize.targetHeight == 1024)
+      expect(req).assertEqual(true);
+    })
+    it('AT_MOST', 1, () => {
+      let reqSize: calculateScaleType =
+        new Downsampler().calculateScaling('jpg', 1024, 1024, 200,
+          200, DownsampleStrategy.AT_MOST, false)
+      let req = (reqSize.targetWidth < 1024 && reqSize.targetHeight < 1024)
+      expect(req).assertEqual(true);
+    })
+    it('FIT_CENTER', 2, () => {
+      let reqSize: calculateScaleType =
+        new Downsampler().calculateScaling('jpg', 1024, 1024, 200,
+          200, DownsampleStrategy.FIT_CENTER, false)
+      let req = (reqSize.targetWidth < 1024 && reqSize.targetHeight < 1024)
+      expect(req).assertEqual(true);
+    })
+    it('CENTER_INSIDE', 3, () => {
+      let reqSize: calculateScaleType =
+        new Downsampler().calculateScaling('jpg', 1024, 1024, 200,
+          200, DownsampleStrategy.CENTER_INSIDE, false)
+      let req = (reqSize.targetWidth < 1024 && reqSize.targetHeight < 1024)
+      expect(req).assertEqual(true);
+    })
+    it('CENTER_OUTSIDE', 4, () => {
+      let reqSize: calculateScaleType =
+        new Downsampler().calculateScaling('jpg', 1024, 1024, 200,
+          200, DownsampleStrategy.CENTER_OUTSIDE, false)
+      let req = (reqSize.targetWidth < 1024 && reqSize.targetHeight < 1024)
+      expect(req).assertEqual(true);
+    })
+
+  })
+}