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#include <gui/BitTube.h>
29
30#include "MessageQueue.h"
31#include "EventThread.h"
32#include "SurfaceFlinger.h"
33
34namespace android {
35
36// ---------------------------------------------------------------------------
37
38MessageBase::MessageBase()
39    : MessageHandler() {
40}
41
42MessageBase::~MessageBase() {
43}
44
45void MessageBase::handleMessage(const Message&) {
46    this->handler();
47    barrier.open();
48};
49
50// ---------------------------------------------------------------------------
51
52void MessageQueue::Handler::dispatchRefresh() {
53    if ((android_atomic_or(eventMaskRefresh, &mEventMask) & eventMaskRefresh) == 0) {
54        mQueue.mLooper->sendMessage(this, Message(MessageQueue::REFRESH));
55    }
56}
57
58void MessageQueue::Handler::dispatchInvalidate() {
59    if ((android_atomic_or(eventMaskInvalidate, &mEventMask) & eventMaskInvalidate) == 0) {
60        mQueue.mLooper->sendMessage(this, Message(MessageQueue::INVALIDATE));
61    }
62}
63
64void MessageQueue::Handler::dispatchTransaction() {
65    if ((android_atomic_or(eventMaskTransaction, &mEventMask) & eventMaskTransaction) == 0) {
66        mQueue.mLooper->sendMessage(this, Message(MessageQueue::TRANSACTION));
67    }
68}
69
70void MessageQueue::Handler::handleMessage(const Message& message) {
71    switch (message.what) {
72        case INVALIDATE:
73            android_atomic_and(~eventMaskInvalidate, &mEventMask);
74            mQueue.mFlinger->onMessageReceived(message.what);
75            break;
76        case REFRESH:
77            android_atomic_and(~eventMaskRefresh, &mEventMask);
78            mQueue.mFlinger->onMessageReceived(message.what);
79            break;
80        case TRANSACTION:
81            android_atomic_and(~eventMaskTransaction, &mEventMask);
82            mQueue.mFlinger->onMessageReceived(message.what);
83            break;
84    }
85}
86
87// ---------------------------------------------------------------------------
88
89MessageQueue::MessageQueue()
90{
91}
92
93MessageQueue::~MessageQueue() {
94}
95
96void MessageQueue::init(const sp<SurfaceFlinger>& flinger)
97{
98    mFlinger = flinger;
99    mLooper = new Looper(true);
100    mHandler = new Handler(*this);
101}
102
103void MessageQueue::setEventThread(const sp<EventThread>& eventThread)
104{
105    mEventThread = eventThread;
106    mEvents = eventThread->createEventConnection();
107    mEventTube = mEvents->getDataChannel();
108    mLooper->addFd(mEventTube->getFd(), 0, Looper::EVENT_INPUT,
109            MessageQueue::cb_eventReceiver, this);
110}
111
112void MessageQueue::waitMessage() {
113    do {
114        IPCThreadState::self()->flushCommands();
115        int32_t ret = mLooper->pollOnce(-1);
116        switch (ret) {
117            case Looper::POLL_WAKE:
118            case Looper::POLL_CALLBACK:
119                continue;
120            case Looper::POLL_ERROR:
121                ALOGE("Looper::POLL_ERROR");
122            case Looper::POLL_TIMEOUT:
123                // timeout (should not happen)
124                continue;
125            default:
126                // should not happen
127                ALOGE("Looper::pollOnce() returned unknown status %d", ret);
128                continue;
129        }
130    } while (true);
131}
132
133status_t MessageQueue::postMessage(
134        const sp<MessageBase>& messageHandler, nsecs_t relTime)
135{
136    const Message dummyMessage;
137    if (relTime > 0) {
138        mLooper->sendMessageDelayed(relTime, messageHandler, dummyMessage);
139    } else {
140        mLooper->sendMessage(messageHandler, dummyMessage);
141    }
142    return NO_ERROR;
143}
144
145
146/* when INVALIDATE_ON_VSYNC is set SF only processes
147 * buffer updates on VSYNC and performs a refresh immediately
148 * after.
149 *
150 * when INVALIDATE_ON_VSYNC is set to false, SF will instead
151 * perform the buffer updates immediately, but the refresh only
152 * at the next VSYNC.
153 * THIS MODE IS BUGGY ON GALAXY NEXUS AND WILL CAUSE HANGS
154 */
155#define INVALIDATE_ON_VSYNC 1
156
157void MessageQueue::invalidateTransactionNow() {
158    mHandler->dispatchTransaction();
159}
160
161void MessageQueue::invalidate() {
162#if INVALIDATE_ON_VSYNC
163    mEvents->requestNextVsync();
164#else
165    mHandler->dispatchInvalidate();
166#endif
167}
168
169void MessageQueue::refresh() {
170#if INVALIDATE_ON_VSYNC
171    mHandler->dispatchRefresh();
172#else
173    mEvents->requestNextVsync();
174#endif
175}
176
177int MessageQueue::cb_eventReceiver(int fd, int events, void* data) {
178    MessageQueue* queue = reinterpret_cast<MessageQueue *>(data);
179    return queue->eventReceiver(fd, events);
180}
181
182int MessageQueue::eventReceiver(int /*fd*/, int /*events*/) {
183    ssize_t n;
184    DisplayEventReceiver::Event buffer[8];
185    while ((n = DisplayEventReceiver::getEvents(mEventTube, buffer, 8)) > 0) {
186        for (int i=0 ; i<n ; i++) {
187            if (buffer[i].header.type == DisplayEventReceiver::DISPLAY_EVENT_VSYNC) {
188#if INVALIDATE_ON_VSYNC
189                mHandler->dispatchInvalidate();
190#else
191                mHandler->dispatchRefresh();
192#endif
193                break;
194            }
195        }
196    }
197    return 1;
198}
199
200// ---------------------------------------------------------------------------
201
202}; // namespace android
203