1/*
2 * Copyright (C) 2009 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 <errno.h>
18#include <stdint.h>
19#include <sys/types.h>
20
21#include <binder/IPCThreadState.h>
22
23#include <utils/Log.h>
24#include <utils/Timers.h>
25#include <utils/threads.h>
26
27#include <gui/DisplayEventReceiver.h>
28#include <gui/IDisplayEventConnection.h>
29
30#include "EventThread.h"
31#include "MessageQueue.h"
32#include "SurfaceFlinger.h"
33
34namespace android {
35
36// ---------------------------------------------------------------------------
37
38MessageBase::MessageBase() : MessageHandler() {}
39
40MessageBase::~MessageBase() {}
41
42void MessageBase::handleMessage(const Message&) {
43    this->handler();
44    barrier.open();
45};
46
47// ---------------------------------------------------------------------------
48
49MessageQueue::~MessageQueue() = default;
50
51// ---------------------------------------------------------------------------
52
53namespace impl {
54
55void MessageQueue::Handler::dispatchRefresh() {
56    if ((android_atomic_or(eventMaskRefresh, &mEventMask) & eventMaskRefresh) == 0) {
57        mQueue.mLooper->sendMessage(this, Message(MessageQueue::REFRESH));
58    }
59}
60
61void MessageQueue::Handler::dispatchInvalidate() {
62    if ((android_atomic_or(eventMaskInvalidate, &mEventMask) & eventMaskInvalidate) == 0) {
63        mQueue.mLooper->sendMessage(this, Message(MessageQueue::INVALIDATE));
64    }
65}
66
67void MessageQueue::Handler::handleMessage(const Message& message) {
68    switch (message.what) {
69        case INVALIDATE:
70            android_atomic_and(~eventMaskInvalidate, &mEventMask);
71            mQueue.mFlinger->onMessageReceived(message.what);
72            break;
73        case REFRESH:
74            android_atomic_and(~eventMaskRefresh, &mEventMask);
75            mQueue.mFlinger->onMessageReceived(message.what);
76            break;
77    }
78}
79
80// ---------------------------------------------------------------------------
81
82void MessageQueue::init(const sp<SurfaceFlinger>& flinger) {
83    mFlinger = flinger;
84    mLooper = new Looper(true);
85    mHandler = new Handler(*this);
86}
87
88void MessageQueue::setEventThread(android::EventThread* eventThread) {
89    if (mEventThread == eventThread) {
90        return;
91    }
92
93    if (mEventTube.getFd() >= 0) {
94        mLooper->removeFd(mEventTube.getFd());
95    }
96
97    mEventThread = eventThread;
98    mEvents = eventThread->createEventConnection();
99    mEvents->stealReceiveChannel(&mEventTube);
100    mLooper->addFd(mEventTube.getFd(), 0, Looper::EVENT_INPUT, MessageQueue::cb_eventReceiver,
101                   this);
102}
103
104void MessageQueue::waitMessage() {
105    do {
106        IPCThreadState::self()->flushCommands();
107        int32_t ret = mLooper->pollOnce(-1);
108        switch (ret) {
109            case Looper::POLL_WAKE:
110            case Looper::POLL_CALLBACK:
111                continue;
112            case Looper::POLL_ERROR:
113                ALOGE("Looper::POLL_ERROR");
114                continue;
115            case Looper::POLL_TIMEOUT:
116                // timeout (should not happen)
117                continue;
118            default:
119                // should not happen
120                ALOGE("Looper::pollOnce() returned unknown status %d", ret);
121                continue;
122        }
123    } while (true);
124}
125
126status_t MessageQueue::postMessage(const sp<MessageBase>& messageHandler, nsecs_t relTime) {
127    const Message dummyMessage;
128    if (relTime > 0) {
129        mLooper->sendMessageDelayed(relTime, messageHandler, dummyMessage);
130    } else {
131        mLooper->sendMessage(messageHandler, dummyMessage);
132    }
133    return NO_ERROR;
134}
135
136void MessageQueue::invalidate() {
137    mEvents->requestNextVsync();
138}
139
140void MessageQueue::refresh() {
141    mHandler->dispatchRefresh();
142}
143
144int MessageQueue::cb_eventReceiver(int fd, int events, void* data) {
145    MessageQueue* queue = reinterpret_cast<MessageQueue*>(data);
146    return queue->eventReceiver(fd, events);
147}
148
149int MessageQueue::eventReceiver(int /*fd*/, int /*events*/) {
150    ssize_t n;
151    DisplayEventReceiver::Event buffer[8];
152    while ((n = DisplayEventReceiver::getEvents(&mEventTube, buffer, 8)) > 0) {
153        for (int i = 0; i < n; i++) {
154            if (buffer[i].header.type == DisplayEventReceiver::DISPLAY_EVENT_VSYNC) {
155                mHandler->dispatchInvalidate();
156                break;
157            }
158        }
159    }
160    return 1;
161}
162
163// ---------------------------------------------------------------------------
164
165} // namespace impl
166} // namespace android
167