1.新增pngLoadWorker.ets 和 pngWorkers.ts

Signed-off-by: zhoulisheng <635547767@qq.com>

entry/src/main/ets/workers/PngLoadWorker.ets

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+/*
+ * Copyright (C) 2023 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 worker, { ThreadWorkerGlobalScope, MessageEvents, ErrorEvent } from '@ohos.worker';
+import { UPNG } from '@ohos/libraryimageknife'
+import {resolvePngWorker} from './pngWorker'
+const workerPort: ThreadWorkerGlobalScope = worker.workerPort;
+
+workerPort.onmessage =  (e: MessageEvents)=> {
+  resolvePngWorker(workerPort,UPNG,e)
+}

entry/src/main/ets/workers/pngWorker.ts

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+/*
+ * Copyright (C) 2023 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 worker, { ThreadWorkerGlobalScope, MessageEvents, ErrorEvent } from '@ohos.worker';
+export  function resolvePngWorker (workerPort,UPNG, e: MessageEvents) {
+  let data = e.data;
+  switch (data.type) {
+    case 'readPngImageAsync':
+      let png = UPNG.decode(data.data);
+      let array = png.data;
+      let arrayData = array.buffer.slice(array.byteOffset, array.byteLength + array.byteOffset)
+      png.data = arrayData;
+      let dataObj = { type: 'readPngImageAsync', data: png, receiver: data.data }
+      workerPort.postMessage(dataObj, [png.data, data.data]);
+      break;
+    case 'writePngWithStringAsync':
+      let addInfo = data.info;
+      let pngDecode = UPNG.decode(data.data);
+      let newPng = UPNG.encodeWithString(addInfo, UPNG.toRGBA8(pngDecode), pngDecode.width, pngDecode.height, 0)
+      let dataObj2 = { type: 'writePngWithStringAsync', data: newPng, receiver: data.data }
+      workerPort.postMessage(dataObj2, [newPng, data.data]);
+      break;
+    case 'writePngAsync':
+      let pngDecode3 = UPNG.decode(data.data);
+      let newPng3 = UPNG.encode(UPNG.toRGBA8(pngDecode3), pngDecode3.width, pngDecode3.height, 0)
+      let dataObj3 = { type: 'writePngAsync', data: newPng3, receiver: data.data }
+      workerPort.postMessage(dataObj3, [newPng3, data.data]);
+      break;
+    default:
+      break
+  }
+}