1/*
2 * Copyright (C) 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#include "EventControlThread.h"
18#include "SurfaceFlinger.h"
19
20namespace android {
21
22EventControlThread::EventControlThread(const sp<SurfaceFlinger>& flinger):
23        mFlinger(flinger),
24        mVsyncEnabled(false) {
25}
26
27void EventControlThread::setVsyncEnabled(bool enabled) {
28    Mutex::Autolock lock(mMutex);
29    mVsyncEnabled = enabled;
30    mCond.signal();
31}
32
33bool EventControlThread::threadLoop() {
34    Mutex::Autolock lock(mMutex);
35
36    bool vsyncEnabled = mVsyncEnabled;
37
38    mFlinger->eventControl(HWC_DISPLAY_PRIMARY, SurfaceFlinger::EVENT_VSYNC,
39            mVsyncEnabled);
40
41    while (true) {
42        status_t err = mCond.wait(mMutex);
43        if (err != NO_ERROR) {
44            ALOGE("error waiting for new events: %s (%d)",
45                strerror(-err), err);
46            return false;
47        }
48
49        if (vsyncEnabled != mVsyncEnabled) {
50            mFlinger->eventControl(HWC_DISPLAY_PRIMARY,
51                    SurfaceFlinger::EVENT_VSYNC, mVsyncEnabled);
52            vsyncEnabled = mVsyncEnabled;
53        }
54    }
55
56    return false;
57}
58
59} // namespace android
60