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      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 
     38 MessageBase::MessageBase() : MessageHandler() {}
     39 
     40 MessageBase::~MessageBase() {}
     41 
     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 
     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 
     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 
     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 
     82 void MessageQueue::init(const sp<SurfaceFlinger>& flinger) {
     83     mFlinger = flinger;
     84     mLooper = new Looper(true);
     85     mHandler = new Handler(*this);
     86 }
     87 
     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 
    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 
    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 
    136 void MessageQueue::invalidate() {
    137     mEvents->requestNextVsync();
    138 }
    139 
    140 void MessageQueue::refresh() {
    141     mHandler->dispatchRefresh();
    142 }
    143 
    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 
    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