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
34 namespace android {
35
36 // ---------------------------------------------------------------------------
37
MessageBase()38 MessageBase::MessageBase()
39 : MessageHandler() {
40 }
41
~MessageBase()42 MessageBase::~MessageBase() {
43 }
44
handleMessage(const Message &)45 void MessageBase::handleMessage(const Message&) {
46 this->handler();
47 barrier.open();
48 };
49
50 // ---------------------------------------------------------------------------
51
dispatchRefresh()52 void MessageQueue::Handler::dispatchRefresh() {
53 if ((android_atomic_or(eventMaskRefresh, &mEventMask) & eventMaskRefresh) == 0) {
54 mQueue.mLooper->sendMessage(this, Message(MessageQueue::REFRESH));
55 }
56 }
57
dispatchInvalidate()58 void MessageQueue::Handler::dispatchInvalidate() {
59 if ((android_atomic_or(eventMaskInvalidate, &mEventMask) & eventMaskInvalidate) == 0) {
60 mQueue.mLooper->sendMessage(this, Message(MessageQueue::INVALIDATE));
61 }
62 }
63
dispatchTransaction()64 void MessageQueue::Handler::dispatchTransaction() {
65 if ((android_atomic_or(eventMaskTransaction, &mEventMask) & eventMaskTransaction) == 0) {
66 mQueue.mLooper->sendMessage(this, Message(MessageQueue::TRANSACTION));
67 }
68 }
69
handleMessage(const Message & message)70 void 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
MessageQueue()89 MessageQueue::MessageQueue()
90 {
91 }
92
~MessageQueue()93 MessageQueue::~MessageQueue() {
94 }
95
init(const sp<SurfaceFlinger> & flinger)96 void MessageQueue::init(const sp<SurfaceFlinger>& flinger)
97 {
98 mFlinger = flinger;
99 mLooper = new Looper(true);
100 mHandler = new Handler(*this);
101 }
102
setEventThread(const sp<EventThread> & eventThread)103 void 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
waitMessage()112 void 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
postMessage(const sp<MessageBase> & messageHandler,nsecs_t relTime)133 status_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
invalidateTransactionNow()157 void MessageQueue::invalidateTransactionNow() {
158 mHandler->dispatchTransaction();
159 }
160
invalidate()161 void MessageQueue::invalidate() {
162 #if INVALIDATE_ON_VSYNC
163 mEvents->requestNextVsync();
164 #else
165 mHandler->dispatchInvalidate();
166 #endif
167 }
168
refresh()169 void MessageQueue::refresh() {
170 #if INVALIDATE_ON_VSYNC
171 mHandler->dispatchRefresh();
172 #else
173 mEvents->requestNextVsync();
174 #endif
175 }
176
cb_eventReceiver(int fd,int events,void * data)177 int MessageQueue::cb_eventReceiver(int fd, int events, void* data) {
178 MessageQueue* queue = reinterpret_cast<MessageQueue *>(data);
179 return queue->eventReceiver(fd, events);
180 }
181
eventReceiver(int,int)182 int 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