#鸿蒙学习大百科#如何使用TaskPool执行任务组？

import taskpool from '@ohos.taskpool';

@Concurrent
function imageProcessing(dataSlice: ArrayBuffer): ArrayBuffer {
  // 步骤1: 具体的图像处理操作及其他耗时操作
  return dataSlice;
}

function histogramStatistic(pixelBuffer: ArrayBuffer): void {
  // 步骤2: 分成三段并发调度
  let number: number = pixelBuffer.byteLength / 3;
  let buffer1: ArrayBuffer = pixelBuffer.slice(0, number);
  let buffer2: ArrayBuffer = pixelBuffer.slice(number, number * 2);
  let buffer3: ArrayBuffer = pixelBuffer.slice(number * 2);

  let group: taskpool.TaskGroup = new taskpool.TaskGroup();
  group.addTask(imageProcessing, buffer1);
  group.addTask(imageProcessing, buffer2);
  group.addTask(imageProcessing, buffer3);

  taskpool.execute(group, taskpool.Priority.HIGH).then((ret: Object) => {
    // 步骤3: 结果数组汇总处理
  })
}

@Entry
@Component
struct Index {
  @State message: string = 'Hello World'

  build() {
    Row() {
      Column() {
        Text(this.message)
          .fontSize(50)
          .fontWeight(FontWeight.Bold)
          .onClick(() => {
            let buffer: ArrayBuffer = new ArrayBuffer(24);
            histogramStatistic(buffer);
          })
      }
      .width('100%')
    }
    .height('100%')
  }
}
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