更新空白

commons/basic/src/main/ets/utils/ChangeUtil.ets

@@ -66,10 +66,31 @@ export class ChangeUtil {
     const buffer = new ArrayBuffer(stat.size);
     fileIo.readSync(file.fd, buffer);
     fileIo.closeSync(file);
+    const buffernew=await ChangeUtil.compression(buffer,"image/jpeg",0.5)
 
     // 编码为 Base64
     const base64Helper = new util.Base64Helper();
-    return base64Helper.encodeToStringSync(new Uint8Array(buffer));
+    return base64Helper.encodeToStringSync(new Uint8Array(buffernew));
+  }
+  /**
+   * 压缩图片
+   * @param buffer 二进制
+   * @param contentType image/jpeg 保存后的文件格式
+   * @param compressionRatio 1 就是 100%， 0.5 就是50%
+   * @returns
+   */
+    static async compression(buffer: ArrayBuffer, contentType: string, compressionRatio: number = 0.5) {
+    // 这里判断 1，是因为压缩的时候传了 100%，也会丢失一点精度，所以直接返回了。
+    if (compressionRatio == 1) {
+      return buffer
+    }
+    const imageSource: image.ImageSource = image.createImageSource(buffer);
+
+    const imagePackerApi = image.createImagePacker();
+    const bf = await imagePackerApi.packing(imageSource, { format: contentType, quality: compressionRatio * 100 })
+
+
+    return bf
   }
   /**
    * 将图片转换为base64字符串