# coding:utf-8
# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
#
# 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 contextlib
import base64
import numpy as np
import cv2


@contextlib.contextmanager
def lock_predictor(lock):
 lock.acquire()
 try:
 yield
 finally:
 lock.release()


def cv2_to_base64(image):
 data = cv2.imencode('.jpg', image)[1]
 return base64.b64encode(data.tobytes()).decode('utf8')


def base64_to_cv2(b64str):
 data = base64.b64decode(b64str.encode('utf8'))
 data = np.fromstring(data, np.uint8)
 data = cv2.imdecode(data, cv2.IMREAD_COLOR)
 return data