Android 7.1 默认自拍镜像

近来收到客户需求反馈需要将相机前摄成像默认为镜像显示，大致思路我们可以在保存数据前将前摄拍的照片转为镜像，保存数据是通过PhotoMode.java文件中的saveData方法实现，具体修改参照如下：

首先添加将图片转为镜像显示的方法，具体功能代码参照如下：

/vendor/mediatek/proprietary/packages/apps/Camera2/common/src/com/mediatek/camera/common/utils/CameraUtil.java

复制代码

+public static byte[] mirrorJpegData(byte[] jpegData, int orientation) {
+        byte[] dest = jpegData;
+        BitmapFactory.Options opts = new BitmapFactory.Options();
+        opts.inMutable = true;
+        Bitmap b = BitmapFactory.decodeByteArray(jpegData, 0, jpegData.length, opts);
+        b = PhotoModeHelper.rotateAndMirror(b, 0, true);
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        b.compress(Bitmap.CompressFormat.JPEG, 100, baos);
+        dest = baos.toByteArray();
+        b.recycle();
+
+        return dest;
+    }

其次我们在相机保存数据前将前摄拍的照片转为镜像，拍摄时使用的是前摄还是后摄可以通过CameraId来区分，CameraId值为0是后摄，CameraId值为1是前摄，具体修改参照如下：

/vendor/mediatek/proprietary/packages/apps/Camera2/common/src/com/mediatek/camera/common/mode/photo/PhotoMode.java

复制代码

   private void saveData(byte[] jpegData) {
        if (jpegData != null) {
            //check memory to decide whether it can take next picture.
            //if not, show saving
            ISettingManager.SettingController controller = mISettingManager.getSettingController();
            String dngState = controller.queryValue(KEY_DNG);
            long saveDataSize = jpegData.length;
+	    if(mCameraId.equals("1")){
+		jpegData = CameraUtil.mirrorJpegData(jpegData,0);
+	    }
            if (dngState != null && "on".equalsIgnoreCase(dngState)) {
                saveDataSize = saveDataSize + DNG_IMAGE_SIZE;
            }

最后成像后在相机界面预览的缩略图我们也要做相应的镜像处理，具体修改参照如下：

/vendor/mediatek/proprietary/packages/apps/Camera2/common/src/com/mediatek/camera/common/mode/photo/PhotoMode.java

复制代码

   private void updateThumbnail(byte[] jpegData) {
        Bitmap bitmap = BitmapCreator.createBitmapFromJpeg(jpegData, mIApp.getAppUi()
                .getThumbnailViewWidth());
+	    if(mCameraId.equals("1")){
+	    	bitmap = PhotoModeHelper.rotateAndMirror(bitmap, 0, true);
+	    }
        mIApp.getAppUi().updateThumbnail(bitmap);
    }

重新编译验证，修改生效，已实现相机前摄成像默认为镜像显示