libs/gui/DisplayEventReceiver.cpp

   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