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 16import { taskpool } from '@kit.ArkTS'; 17import { loadPixelMap } from './pixelMapTest'; 18import { BusinessError } from '@kit.BasicServicesKit'; 19 20@Entry 21@Component 22struct Index { 23 @State message: string = 'Hello World'; 24 @State pixelMap: PixelMap | undefined = undefined; 25 26 private loadImageFromThread(): void { 27 const resourceMgr = getContext(this).resourceManager; 28 // 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。 29 resourceMgr.getRawFd('startIcon.png').then(rawFileDescriptor => { 30 taskpool.execute(loadPixelMap, rawFileDescriptor).then(pixelMap => { 31 if (pixelMap) { 32 this.pixelMap = pixelMap as PixelMap; 33 console.log('Succeeded in creating pixelMap.'); 34 // 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。 35 this.pixelMap.release(); 36 } else { 37 console.error('Failed to create pixelMap.'); 38 } 39 }).catch((e: BusinessError) => { 40 console.error('taskpool execute loadPixelMap failed. Code: ' + e.code + ', message: ' + e.message); 41 }); 42 }); 43 } 44 45 build() { 46 RelativeContainer() { 47 Text(this.message) 48 .id('HelloWorld') 49 .fontSize(50) 50 .fontWeight(FontWeight.Bold) 51 .alignRules({ 52 center: { anchor: '__container__', align: VerticalAlign.Center }, 53 middle: { anchor: '__container__', align: HorizontalAlign.Center } 54 }) 55 .onClick(() => { 56 this.loadImageFromThread(); 57 this.message = 'success'; 58 }) 59 } 60 .height('100%') 61 .width('100%') 62 } 63} 64
