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
33 namespace android {
34
35 // ---------------------------------------------------------------------------
36
MessageBase()37 MessageBase::MessageBase()
38 : MessageHandler() {
39 }
40
~MessageBase()41 MessageBase::~MessageBase() {
42 }
43
handleMessage(const Message &)44 void MessageBase::handleMessage(const Message&) {
45 this->handler();
46 barrier.open();
47 };
48
49 // ---------------------------------------------------------------------------
50
dispatchRefresh()51 void MessageQueue::Handler::dispatchRefresh() {
52 if ((android_atomic_or(eventMaskRefresh, &mEventMask) & eventMaskRefresh) == 0) {
53 mQueue.mLooper->sendMessage(this, Message(MessageQueue::REFRESH));
54 }
55 }
56
dispatchInvalidate()57 void MessageQueue::Handler::dispatchInvalidate() {
58 if ((android_atomic_or(eventMaskInvalidate, &mEventMask) & eventMaskInvalidate) == 0) {
59 mQueue.mLooper->sendMessage(this, Message(MessageQueue::INVALIDATE));
60 }
61 }
62
handleMessage(const Message & message)63 void 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
MessageQueue()78 MessageQueue::MessageQueue()
79 {
80 }
81
~MessageQueue()82 MessageQueue::~MessageQueue() {
83 }
84
init(const sp<SurfaceFlinger> & flinger)85 void MessageQueue::init(const sp<SurfaceFlinger>& flinger)
86 {
87 mFlinger = flinger;
88 mLooper = new Looper(true);
89 mHandler = new Handler(*this);
90 }
91
setEventThread(const sp<EventThread> & eventThread)92 void MessageQueue::setEventThread(const sp<EventThread>& eventThread)
93 {
94 if (mEventThread == eventThread) {
95 return;
96 }
97
98 if (mEventTube.getFd() >= 0) {
99 mLooper->removeFd(mEventTube.getFd());
100 }
101
102 mEventThread = eventThread;
103 mEvents = eventThread->createEventConnection();
104 mEvents->stealReceiveChannel(&mEventTube);
105 mLooper->addFd(mEventTube.getFd(), 0, Looper::EVENT_INPUT,
106 MessageQueue::cb_eventReceiver, this);
107 }
108
waitMessage()109 void MessageQueue::waitMessage() {
110 do {
111 IPCThreadState::self()->flushCommands();
112 int32_t ret = mLooper->pollOnce(-1);
113 switch (ret) {
114 case Looper::POLL_WAKE:
115 case Looper::POLL_CALLBACK:
116 continue;
117 case Looper::POLL_ERROR:
118 ALOGE("Looper::POLL_ERROR");
119 continue;
120 case Looper::POLL_TIMEOUT:
121 // timeout (should not happen)
122 continue;
123 default:
124 // should not happen
125 ALOGE("Looper::pollOnce() returned unknown status %d", ret);
126 continue;
127 }
128 } while (true);
129 }
130
postMessage(const sp<MessageBase> & messageHandler,nsecs_t relTime)131 status_t MessageQueue::postMessage(
132 const sp<MessageBase>& messageHandler, nsecs_t relTime)
133 {
134 const Message dummyMessage;
135 if (relTime > 0) {
136 mLooper->sendMessageDelayed(relTime, messageHandler, dummyMessage);
137 } else {
138 mLooper->sendMessage(messageHandler, dummyMessage);
139 }
140 return NO_ERROR;
141 }
142
143
invalidate()144 void MessageQueue::invalidate() {
145 mEvents->requestNextVsync();
146 }
147
refresh()148 void MessageQueue::refresh() {
149 mHandler->dispatchRefresh();
150 }
151
cb_eventReceiver(int fd,int events,void * data)152 int MessageQueue::cb_eventReceiver(int fd, int events, void* data) {
153 MessageQueue* queue = reinterpret_cast<MessageQueue *>(data);
154 return queue->eventReceiver(fd, events);
155 }
156
eventReceiver(int,int)157 int MessageQueue::eventReceiver(int /*fd*/, int /*events*/) {
158 ssize_t n;
159 DisplayEventReceiver::Event buffer[8];
160 while ((n = DisplayEventReceiver::getEvents(&mEventTube, buffer, 8)) > 0) {
161 for (int i=0 ; i<n ; i++) {
162 if (buffer[i].header.type == DisplayEventReceiver::DISPLAY_EVENT_VSYNC) {
163 mHandler->dispatchInvalidate();
164 break;
165 }
166 }
167 }
168 return 1;
169 }
170
171 // ---------------------------------------------------------------------------
172
173 }; // namespace android
174