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/*
* 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;
mFlinger->setVsyncEnabled(HWC_DISPLAY_PRIMARY, enable);
currentVsyncState = requestedVsyncState;
}
return false;
}
} // namespace android
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