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: FrameWaiter()26 FrameWaiter(): 27 mPendingFrames(0) { 28 } 29 waitForFrame()30 void waitForFrame() { 31 Mutex::Autolock lock(mMutex); 32 while (mPendingFrames == 0) { 33 mCondition.wait(mMutex); 34 } 35 mPendingFrames--; 36 } 37 onFrameAvailable(const BufferItem &)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