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      1 /*
      2  * Copyright (C) 2011 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 <string.h>
     18 
     19 #include <utils/Errors.h>
     20 
     21 #include <gui/DisplayEventReceiver.h>
     22 #include <gui/IDisplayEventConnection.h>
     23 #include <gui/ISurfaceComposer.h>
     24 
     25 #include <private/gui/ComposerService.h>
     26 
     27 #include <private/gui/BitTube.h>
     28 
     29 // ---------------------------------------------------------------------------
     30 
     31 namespace android {
     32 
     33 // ---------------------------------------------------------------------------
     34 
     35 DisplayEventReceiver::DisplayEventReceiver(ISurfaceComposer::VsyncSource vsyncSource) {
     36     sp<ISurfaceComposer> sf(ComposerService::getComposerService());
     37     if (sf != NULL) {
     38         mEventConnection = sf->createDisplayEventConnection(vsyncSource);
     39         if (mEventConnection != NULL) {
     40             mDataChannel = std::make_unique<gui::BitTube>();
     41             mEventConnection->stealReceiveChannel(mDataChannel.get());
     42         }
     43     }
     44 }
     45 
     46 DisplayEventReceiver::~DisplayEventReceiver() {
     47 }
     48 
     49 status_t DisplayEventReceiver::initCheck() const {
     50     if (mDataChannel != NULL)
     51         return NO_ERROR;
     52     return NO_INIT;
     53 }
     54 
     55 int DisplayEventReceiver::getFd() const {
     56     if (mDataChannel == NULL)
     57         return NO_INIT;
     58 
     59     return mDataChannel->getFd();
     60 }
     61 
     62 status_t DisplayEventReceiver::setVsyncRate(uint32_t count) {
     63     if (int32_t(count) < 0)
     64         return BAD_VALUE;
     65 
     66     if (mEventConnection != NULL) {
     67         mEventConnection->setVsyncRate(count);
     68         return NO_ERROR;
     69     }
     70     return NO_INIT;
     71 }
     72 
     73 status_t DisplayEventReceiver::requestNextVsync() {
     74     if (mEventConnection != NULL) {
     75         mEventConnection->requestNextVsync();
     76         return NO_ERROR;
     77     }
     78     return NO_INIT;
     79 }
     80 
     81 
     82 ssize_t DisplayEventReceiver::getEvents(DisplayEventReceiver::Event* events,
     83         size_t count) {
     84     return DisplayEventReceiver::getEvents(mDataChannel.get(), events, count);
     85 }
     86 
     87 ssize_t DisplayEventReceiver::getEvents(gui::BitTube* dataChannel,
     88         Event* events, size_t count)
     89 {
     90     return gui::BitTube::recvObjects(dataChannel, events, count);
     91 }
     92 
     93 ssize_t DisplayEventReceiver::sendEvents(gui::BitTube* dataChannel,
     94         Event const* events, size_t count)
     95 {
     96     return gui::BitTube::sendObjects(dataChannel, events, count);
     97 }
     98 
     99 // ---------------------------------------------------------------------------
    100 
    101 }; // namespace android
    102