1/*
2 * Copyright 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ANDROID_FRAME_WAITER_H
18#define ANDROID_FRAME_WAITER_H
19
20#include <gui/GLConsumer.h>
21
22namespace android {
23
24class FrameWaiter : public GLConsumer::FrameAvailableListener {
25public:
26    FrameWaiter():
27            mPendingFrames(0) {
28    }
29
30    void waitForFrame() {
31        Mutex::Autolock lock(mMutex);
32        while (mPendingFrames == 0) {
33            mCondition.wait(mMutex);
34        }
35        mPendingFrames--;
36    }
37
38    virtual void onFrameAvailable(const BufferItem& /* item */) {
39        Mutex::Autolock lock(mMutex);
40        mPendingFrames++;
41        mCondition.signal();
42    }
43
44private:
45    int mPendingFrames;
46    Mutex mMutex;
47    Condition mCondition;
48};
49
50} // namespace android
51
52#endif
53