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
handleMessage(const Message & message)64 void MessageQueue::Handler::handleMessage(const Message& message) {
65 switch (message.what) {
66 case INVALIDATE:
67 android_atomic_and(~eventMaskInvalidate, &mEventMask);
68 mQueue.mFlinger->onMessageReceived(message.what);
69 break;
70 case REFRESH:
71 android_atomic_and(~eventMaskRefresh, &mEventMask);
72 mQueue.mFlinger->onMessageReceived(message.what);
73 break;
74 }
75 }
76
77 // ---------------------------------------------------------------------------
78
MessageQueue()79 MessageQueue::MessageQueue()
80 {
81 }
82
~MessageQueue()83 MessageQueue::~MessageQueue() {
84 }
85
init(const sp<SurfaceFlinger> & flinger)86 void MessageQueue::init(const sp<SurfaceFlinger>& flinger)
87 {
88 mFlinger = flinger;
89 mLooper = new Looper(true);
90 mHandler = new Handler(*this);
91 }
92
setEventThread(const sp<EventThread> & eventThread)93 void MessageQueue::setEventThread(const sp<EventThread>& eventThread)
94 {
95 mEventThread = eventThread;
96 mEvents = eventThread->createEventConnection();
97 mEventTube = mEvents->getDataChannel();
98 mLooper->addFd(mEventTube->getFd(), 0, Looper::EVENT_INPUT,
99 MessageQueue::cb_eventReceiver, this);
100 }
101
waitMessage()102 void MessageQueue::waitMessage() {
103 do {
104 IPCThreadState::self()->flushCommands();
105 int32_t ret = mLooper->pollOnce(-1);
106 switch (ret) {
107 case Looper::POLL_WAKE:
108 case Looper::POLL_CALLBACK:
109 continue;
110 case Looper::POLL_ERROR:
111 ALOGE("Looper::POLL_ERROR");
112 continue;
113 case Looper::POLL_TIMEOUT:
114 // timeout (should not happen)
115 continue;
116 default:
117 // should not happen
118 ALOGE("Looper::pollOnce() returned unknown status %d", ret);
119 continue;
120 }
121 } while (true);
122 }
123
postMessage(const sp<MessageBase> & messageHandler,nsecs_t relTime)124 status_t MessageQueue::postMessage(
125 const sp<MessageBase>& messageHandler, nsecs_t relTime)
126 {
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
136
invalidate()137 void MessageQueue::invalidate() {
138 mEvents->requestNextVsync();
139 }
140
refresh()141 void MessageQueue::refresh() {
142 mHandler->dispatchRefresh();
143 }
144
cb_eventReceiver(int fd,int events,void * data)145 int MessageQueue::cb_eventReceiver(int fd, int events, void* data) {
146 MessageQueue* queue = reinterpret_cast<MessageQueue *>(data);
147 return queue->eventReceiver(fd, events);
148 }
149
eventReceiver(int,int)150 int MessageQueue::eventReceiver(int /*fd*/, int /*events*/) {
151 ssize_t n;
152 DisplayEventReceiver::Event buffer[8];
153 while ((n = DisplayEventReceiver::getEvents(mEventTube, buffer, 8)) > 0) {
154 for (int i=0 ; i<n ; i++) {
155 if (buffer[i].header.type == DisplayEventReceiver::DISPLAY_EVENT_VSYNC) {
156 mHandler->dispatchInvalidate();
157 break;
158 }
159 }
160 }
161 return 1;
162 }
163
164 // ---------------------------------------------------------------------------
165
166 }; // namespace android
167