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1/*
2 * Copyright (c) 2025 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16// [Start example_pass_obj]
17import { taskpool } from '@kit.ArkTS';
18import { loadPixelMap } from './pixelMapTest';
19import { BusinessError } from '@kit.BasicServicesKit';
20
21@Entry
22@Component
23struct Index {
24  @State message: string = 'Hello World';
25  @State pixelMap: PixelMap | undefined = undefined;
26
27  private loadImageFromThread(): void {
28    const resourceMgr = getContext(this).resourceManager;
29    // 此处‘startIcon.png’为media下复制到rawfile文件夹中，请开发者自行替换，否则imageSource创建失败会导致后续无法正常执行。
30    resourceMgr.getRawFd('startIcon.png').then(rawFileDescriptor => {
31      taskpool.execute(loadPixelMap, rawFileDescriptor).then(pixelMap => {
32        if (pixelMap) {
33          this.pixelMap = pixelMap as PixelMap;
34          console.log('Succeeded in creating pixelMap.');
35          // 主线程释放pixelMap。由于子线程返回pixelMap时已调用setTransferDetached，所以此处能够立即释放pixelMap。
36          this.pixelMap.release();
37        } else {
38          console.error('Failed to create pixelMap.');
39        }
40      }).catch((e: BusinessError) => {
41        console.error('taskpool execute loadPixelMap failed. Code: ' + e.code + ', message: ' + e.message);
42      });
43    });
44  }
45
46  build() {
47    RelativeContainer() {
48      Text(this.message)
49        .id('HelloWorld')
50        .fontSize(50)
51        .fontWeight(FontWeight.Bold)
52        .alignRules({
53          center: { anchor: '__container__', align: VerticalAlign.Center },
54          middle: { anchor: '__container__', align: HorizontalAlign.Center }
55        })
56        .onClick(() => {
57          this.loadImageFromThread();
58          this.message = 'success';
59        })
60    }
61    .height('100%')
62    .width('100%')
63  }
64}
65// [End example_pass_obj]
66
67