| /* |
| * Copyright (C) 2013 The Android Open Source Project |
| * |
| * 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. |
| */ |
| |
| #include "EventControlThread.h" |
| #include "SurfaceFlinger.h" |
| |
| namespace android { |
| |
| EventControlThread::EventControlThread(const sp<SurfaceFlinger>& flinger): |
| mFlinger(flinger), |
| mVsyncEnabled(false) { |
| } |
| |
| void EventControlThread::setVsyncEnabled(bool enabled) { |
| Mutex::Autolock lock(mMutex); |
| mVsyncEnabled = enabled; |
| mCond.signal(); |
| } |
| |
| bool EventControlThread::threadLoop() { |
| enum class VsyncState {Unset, On, Off}; |
| auto currentVsyncState = VsyncState::Unset; |
| |
| while (true) { |
| auto requestedVsyncState = VsyncState::On; |
| { |
| Mutex::Autolock lock(mMutex); |
| requestedVsyncState = |
| mVsyncEnabled ? VsyncState::On : VsyncState::Off; |
| while (currentVsyncState == requestedVsyncState) { |
| status_t err = mCond.wait(mMutex); |
| if (err != NO_ERROR) { |
| ALOGE("error waiting for new events: %s (%d)", |
| strerror(-err), err); |
| return false; |
| } |
| requestedVsyncState = |
| mVsyncEnabled ? VsyncState::On : VsyncState::Off; |
| } |
| } |
| |
| bool enable = requestedVsyncState == VsyncState::On; |
| #ifdef USE_HWC2 |
| mFlinger->setVsyncEnabled(HWC_DISPLAY_PRIMARY, enable); |
| #else |
| mFlinger->eventControl(HWC_DISPLAY_PRIMARY, |
| SurfaceFlinger::EVENT_VSYNC, enable); |
| #endif |
| currentVsyncState = requestedVsyncState; |
| } |
| |
| return false; |
| } |
| |
| } // namespace android |