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
34 namespace android {
35
36 // ---------------------------------------------------------------------------
37
MessageBase()38 MessageBase::MessageBase() : MessageHandler() {}
39
~MessageBase()40 MessageBase::~MessageBase() {}
41
handleMessage(const Message &)42 void MessageBase::handleMessage(const Message&) {
43 this->handler();
44 barrier.open();
45 };
46
47 // ---------------------------------------------------------------------------
48
49 MessageQueue::~MessageQueue() = default;
50
51 // ---------------------------------------------------------------------------
52
53 namespace impl {
54
dispatchRefresh()55 void MessageQueue::Handler::dispatchRefresh() {
56 if ((android_atomic_or(eventMaskRefresh, &mEventMask) & eventMaskRefresh) == 0) {
57 mQueue.mLooper->sendMessage(this, Message(MessageQueue::REFRESH));
58 }
59 }
60
dispatchInvalidate()61 void MessageQueue::Handler::dispatchInvalidate() {
62 if ((android_atomic_or(eventMaskInvalidate, &mEventMask) & eventMaskInvalidate) == 0) {
63 mQueue.mLooper->sendMessage(this, Message(MessageQueue::INVALIDATE));
64 }
65 }
66
handleMessage(const Message & message)67 void 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
init(const sp<SurfaceFlinger> & flinger)82 void MessageQueue::init(const sp<SurfaceFlinger>& flinger) {
83 mFlinger = flinger;
84 mLooper = new Looper(true);
85 mHandler = new Handler(*this);
86 }
87
setEventThread(android::EventThread * eventThread)88 void 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
waitMessage()104 void 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
postMessage(const sp<MessageBase> & messageHandler,nsecs_t relTime)126 status_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
invalidate()136 void MessageQueue::invalidate() {
137 mEvents->requestNextVsync();
138 }
139
refresh()140 void MessageQueue::refresh() {
141 mHandler->dispatchRefresh();
142 }
143
cb_eventReceiver(int fd,int events,void * data)144 int MessageQueue::cb_eventReceiver(int fd, int events, void* data) {
145 MessageQueue* queue = reinterpret_cast<MessageQueue*>(data);
146 return queue->eventReceiver(fd, events);
147 }
148
eventReceiver(int,int)149 int 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