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::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
79MessageQueue::MessageQueue()
80{
81}
82
83MessageQueue::~MessageQueue() {
84}
85
86void MessageQueue::init(const sp<SurfaceFlinger>& flinger)
87{
88    mFlinger = flinger;
89    mLooper = new Looper(true);
90    mHandler = new Handler(*this);
91}
92
93void MessageQueue::setEventThread(const sp<EventThread>& eventThread)
94{
95    mEventThread = eventThread;
96    mEvents = eventThread->createEventConnection();
97    mEventTube = mEvents->getDataChannel();
98    mLooper->addFd(mEventTube->getFd(), 0, ALOOPER_EVENT_INPUT,
99            MessageQueue::cb_eventReceiver, this);
100}
101
102void MessageQueue::waitMessage() {
103    do {
104        IPCThreadState::self()->flushCommands();
105        int32_t ret = mLooper->pollOnce(-1);
106        switch (ret) {
107            case ALOOPER_POLL_WAKE:
108            case ALOOPER_POLL_CALLBACK:
109                continue;
110            case ALOOPER_POLL_ERROR:
111                ALOGE("ALOOPER_POLL_ERROR");
112            case ALOOPER_POLL_TIMEOUT:
113                // timeout (should not happen)
114                continue;
115            default:
116                // should not happen
117                ALOGE("Looper::pollOnce() returned unknown status %d", ret);
118                continue;
119        }
120    } while (true);
121}
122
123status_t MessageQueue::postMessage(
124        const sp<MessageBase>& messageHandler, nsecs_t relTime)
125{
126    const Message dummyMessage;
127    if (relTime > 0) {
128        mLooper->sendMessageDelayed(relTime, messageHandler, dummyMessage);
129    } else {
130        mLooper->sendMessage(messageHandler, dummyMessage);
131    }
132    return NO_ERROR;
133}
134
135/* when INVALIDATE_ON_VSYNC is set SF only processes
136 * buffer updates on VSYNC and performs a refresh immediately
137 * after.
138 *
139 * when INVALIDATE_ON_VSYNC is set to false, SF will instead
140 * perform the buffer updates immediately, but the refresh only
141 * at the next VSYNC.
142 * THIS MODE IS BUGGY ON GALAXY NEXUS AND WILL CAUSE HANGS
143 */
144#define INVALIDATE_ON_VSYNC 1
145
146void MessageQueue::invalidate() {
147#if INVALIDATE_ON_VSYNC
148    mEvents->requestNextVsync();
149#else
150    mHandler->dispatchInvalidate();
151#endif
152}
153
154void MessageQueue::refresh() {
155#if INVALIDATE_ON_VSYNC
156    mHandler->dispatchRefresh();
157#else
158    mEvents->requestNextVsync();
159#endif
160}
161
162int MessageQueue::cb_eventReceiver(int fd, int events, void* data) {
163    MessageQueue* queue = reinterpret_cast<MessageQueue *>(data);
164    return queue->eventReceiver(fd, events);
165}
166
167int MessageQueue::eventReceiver(int fd, int events) {
168    ssize_t n;
169    DisplayEventReceiver::Event buffer[8];
170    while ((n = DisplayEventReceiver::getEvents(mEventTube, buffer, 8)) > 0) {
171        for (int i=0 ; i<n ; i++) {
172            if (buffer[i].header.type == DisplayEventReceiver::DISPLAY_EVENT_VSYNC) {
173#if INVALIDATE_ON_VSYNC
174                mHandler->dispatchInvalidate();
175#else
176                mHandler->dispatchRefresh();
177#endif
178                break;
179            }
180        }
181    }
182    return 1;
183}
184
185// ---------------------------------------------------------------------------
186
187}; // namespace android
188