ImageKnife/entry/src/main/ets/pages/SingleImage.ets

/*
 * 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 { ImageKnifeComponent,BlurTransformation,ImageKnifeOption } from '@ohos/libraryimageknife';
import fs from '@ohos.file.fs';
import image from '@ohos.multimedia.image';
import { common2D, drawing } from '@kit.ArkGraphics2D';

@Entry
@ComponentV2
struct SingleImage {
  resource: string = "app.media.svgSample"
  scroller: Scroller = new Scroller;
  localFile: string = getContext(this).filesDir + "/icon.png"
  @Local pixelMap:PixelMap | undefined = undefined;
  @Local DrawingColorFilter: ColorFilter | undefined = undefined
  private color: common2D.Color = { alpha: 255, red: 255, green: 0, blue: 0 };
  aboutToAppear(): void {
    // 拷贝本地文件
    let icon: Uint8Array = getContext(this).resourceManager.getMediaContentSync($r("app.media.startIcon"));
    let file = fs.openSync(this.localFile, fs.OpenMode.CREATE | fs.OpenMode.READ_WRITE);
    fs.writeSync(file.fd, icon.buffer);
    fs.fsyncSync(file.fd);
    fs.closeSync(file);
    this.changePic(getContext().resourceManager.getMediaContentSync( $r("app.media.aaa"))
      .buffer as ArrayBuffer);


  }

  build() {
    Scroll(this.scroller) {
      Column() {
        Text($r('app.string.Local_SVG'))
          .fontSize(30)
          .fontWeight(FontWeight.Bold)
        ImageKnifeComponent({
          imageKnifeOption: new ImageKnifeOption({
            loadSrc: $r("app.media.svgSample"),
            placeholderSrc: $r("app.media.loading"),
            errorholderSrc: $r("app.media.failed"),
            objectFit: ImageFit.Contain
          })
        }).width(100).height(100)
          .onClick(()=>{
            this.DrawingColorFilter = drawing.ColorFilter.createBlendModeColorFilter(this.color, drawing.BlendMode.SRC_IN);
          })
        Text($r('app.string.Under_context_file'))
          .fontSize(30)
          .fontWeight(FontWeight.Bold)
        ImageKnifeComponent({
          imageKnifeOption: new ImageKnifeOption({
            loadSrc: this.localFile,
            placeholderSrc: $r("app.media.loading"),
            errorholderSrc: $r("app.media.failed"),
            objectFit: ImageFit.Contain
          })
        }).width(100).height(100)
        Text($r('app.string.Network_images'))
          .fontSize(30)
          .fontWeight(FontWeight.Bold)
        ImageKnifeComponent({
          imageKnifeOption: new ImageKnifeOption({
            loadSrc:"https://www.openharmony.cn/_nuxt/img/logo.dcf95b3.png",
            placeholderSrc: $r("app.media.loading"),
            errorholderSrc: $r("app.media.failed"),
            objectFit: ImageFit.Contain,
            progressListener:(progress:number)=>{console.info("ImageKnife:: call back progress = " + progress)}
          })
        }).width(100).height(100)
        Text($r('app.string.Custom_network_download'))
          .fontSize(30)
          .fontWeight(FontWeight.Bold)
        ImageKnifeComponent({
          imageKnifeOption: new ImageKnifeOption({
            loadSrc: "https://file.atomgit.com/uploads/user/1704857786989_8994.jpeg",
            placeholderSrc: $r("app.media.loading"),
            errorholderSrc: $r("app.media.failed"),
            objectFit: ImageFit.Contain,
            customGetImage: custom,
            transformation: new BlurTransformation(10)
          })
        }).width(100).height(100)
        Text($r('app.string.PixelMap_loads_images'))
          .fontSize(30)
          .fontWeight(FontWeight.Bold)
        ImageKnifeComponent({
          imageKnifeOption: new ImageKnifeOption({
            loadSrc: this.pixelMap!,
            placeholderSrc: $r("app.media.loading"),
            errorholderSrc: $r("app.media.failed"),
            objectFit: ImageFit.Contain,
          })
        }).width(100).height(100)
      }
      .width('100%')
    }
    .height('100%')
  }

  changePic(buffer: ArrayBuffer){
    let imageSource: image.ImageSource = image.createImageSource(buffer);
    if (imageSource) {
      let decodingOptions: image.DecodingOptions = {
        editable: true,
      }
      imageSource.createPixelMap(decodingOptions,(err,pixelMap)=>{
        this.pixelMap = pixelMap;
      })
    }
  }
}

// 自定义下载方法
@Concurrent
async function custom(context: Context, src: string | PixelMap | Resource): Promise<ArrayBuffer | undefined> {
  console.info("ImageKnife::  custom download：" + src)
  // 举例写死从本地文件读取，也可以自己请求网络图片
  return context.resourceManager.getMediaContentSync($r("app.media.startIcon").id).buffer as ArrayBuffer
}