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 <stdint.h>
18#include <errno.h>
19#include <sys/types.h>
20
21#include <binder/IPCThreadState.h>
22
23#include <utils/threads.h>
24#include <utils/Timers.h>
25#include <utils/Log.h>
26
27#include <gui/IDisplayEventConnection.h>
28
29#include "MessageQueue.h"
30#include "EventThread.h"
31#include "SurfaceFlinger.h"
32
33namespace android {
34
35// ---------------------------------------------------------------------------
36
37MessageBase::MessageBase()
38    : MessageHandler() {
39}
40
41MessageBase::~MessageBase() {
42}
43
44void MessageBase::handleMessage(const Message&) {
45    this->handler();
46    barrier.open();
47};
48
49// ---------------------------------------------------------------------------
50
51void MessageQueue::Handler::dispatchRefresh() {
52    if ((android_atomic_or(eventMaskRefresh, &mEventMask) & eventMaskRefresh) == 0) {
53        mQueue.mLooper->sendMessage(this, Message(MessageQueue::REFRESH));
54    }
55}
56
57void MessageQueue::Handler::dispatchInvalidate() {
58    if ((android_atomic_or(eventMaskInvalidate, &mEventMask) & eventMaskInvalidate) == 0) {
59        mQueue.mLooper->sendMessage(this, Message(MessageQueue::INVALIDATE));
60    }
61}
62
63void MessageQueue::Handler::handleMessage(const Message& message) {
64    switch (message.what) {
65        case INVALIDATE:
66            android_atomic_and(~eventMaskInvalidate, &mEventMask);
67            mQueue.mFlinger->onMessageReceived(message.what);
68            break;
69        case REFRESH:
70            android_atomic_and(~eventMaskRefresh, &mEventMask);
71            mQueue.mFlinger->onMessageReceived(message.what);
72            break;
73    }
74}
75
76// ---------------------------------------------------------------------------
77
78MessageQueue::MessageQueue()
79{
80}
81
82MessageQueue::~MessageQueue() {
83}
84
85void MessageQueue::init(const sp<SurfaceFlinger>& flinger)
86{
87    mFlinger = flinger;
88    mLooper = new Looper(true);
89    mHandler = new Handler(*this);
90}
91
92void MessageQueue::setEventThread(const sp<EventThread>& eventThread)
93{
94    mEventThread = eventThread;
95    mEvents = eventThread->createEventConnection();
96    mEvents->stealReceiveChannel(&mEventTube);
97    mLooper->addFd(mEventTube.getFd(), 0, Looper::EVENT_INPUT,
98            MessageQueue::cb_eventReceiver, this);
99}
100
101void MessageQueue::waitMessage() {
102    do {
103        IPCThreadState::self()->flushCommands();
104        int32_t ret = mLooper->pollOnce(-1);
105        switch (ret) {
106            case Looper::POLL_WAKE:
107            case Looper::POLL_CALLBACK:
108                continue;
109            case Looper::POLL_ERROR:
110                ALOGE("Looper::POLL_ERROR");
111                continue;
112            case Looper::POLL_TIMEOUT:
113                // timeout (should not happen)
114                continue;
115            default:
116                // should not happen
117                ALOGE("Looper::pollOnce() returned unknown status %d", ret);
118                continue;
119        }
120    } while (true);
121}
122
123status_t MessageQueue::postMessage(
124        const sp<MessageBase>& messageHandler, nsecs_t relTime)
125{
126    const Message dummyMessage;
127    if (relTime > 0) {
128        mLooper->sendMessageDelayed(relTime, messageHandler, dummyMessage);
129    } else {
130        mLooper->sendMessage(messageHandler, dummyMessage);
131    }
132    return NO_ERROR;
133}
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 android
166