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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 <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 
     38 MessageBase::MessageBase()
     39     : MessageHandler() {
     40 }
     41 
     42 MessageBase::~MessageBase() {
     43 }
     44 
     45 void MessageBase::handleMessage(const Message&) {
     46     this->handler();
     47     barrier.open();
     48 };
     49 
     50 // ---------------------------------------------------------------------------
     51 
     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 
     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 
     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 
     79 MessageQueue::MessageQueue()
     80 {
     81 }
     82 
     83 MessageQueue::~MessageQueue() {
     84 }
     85 
     86 void MessageQueue::init(const sp<SurfaceFlinger>& flinger)
     87 {
     88     mFlinger = flinger;
     89     mLooper = new Looper(true);
     90     mHandler = new Handler(*this);
     91 }
     92 
     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 
    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 
    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 
    137 void MessageQueue::invalidate() {
    138     mEvents->requestNextVsync();
    139 }
    140 
    141 void MessageQueue::refresh() {
    142     mHandler->dispatchRefresh();
    143 }
    144 
    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 
    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