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      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 
     22 namespace android {
     23 
     24 class FrameWaiter : public GLConsumer::FrameAvailableListener {
     25 public:
     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 
     44 private:
     45     int mPendingFrames;
     46     Mutex mMutex;
     47     Condition mCondition;
     48 };
     49 
     50 } // namespace android
     51 
     52 #endif
     53