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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/ISurfaceComposer.h>
23 #include <gui/VsyncEventData.h>
24 
25 #include <private/gui/ComposerService.h>
26 
27 #include <private/gui/BitTube.h>
28 
29 // ---------------------------------------------------------------------------
30 
31 namespace android {
32 
33 // ---------------------------------------------------------------------------
34 
DisplayEventReceiver(ISurfaceComposer::VsyncSource vsyncSource,ISurfaceComposer::EventRegistrationFlags eventRegistration)35 DisplayEventReceiver::DisplayEventReceiver(
36         ISurfaceComposer::VsyncSource vsyncSource,
37         ISurfaceComposer::EventRegistrationFlags eventRegistration) {
38     sp<ISurfaceComposer> sf(ComposerService::getComposerService());
39     if (sf != nullptr) {
40         mEventConnection = sf->createDisplayEventConnection(vsyncSource, eventRegistration);
41         if (mEventConnection != nullptr) {
42             mDataChannel = std::make_unique<gui::BitTube>();
43             const auto status = mEventConnection->stealReceiveChannel(mDataChannel.get());
44             if (!status.isOk()) {
45                 ALOGE("stealReceiveChannel failed: %s", status.toString8().c_str());
46                 mInitError = std::make_optional<status_t>(status.transactionError());
47                 mDataChannel.reset();
48                 mEventConnection.clear();
49             }
50         }
51     }
52 }
53 
~DisplayEventReceiver()54 DisplayEventReceiver::~DisplayEventReceiver() {
55 }
56 
initCheck() const57 status_t DisplayEventReceiver::initCheck() const {
58     if (mDataChannel != nullptr)
59         return NO_ERROR;
60     return mInitError.has_value() ? mInitError.value() : NO_INIT;
61 }
62 
getFd() const63 int DisplayEventReceiver::getFd() const {
64     if (mDataChannel == nullptr) return mInitError.has_value() ? mInitError.value() : NO_INIT;
65 
66     return mDataChannel->getFd();
67 }
68 
setVsyncRate(uint32_t count)69 status_t DisplayEventReceiver::setVsyncRate(uint32_t count) {
70     if (int32_t(count) < 0)
71         return BAD_VALUE;
72 
73     if (mEventConnection != nullptr) {
74         mEventConnection->setVsyncRate(count);
75         return NO_ERROR;
76     }
77     return mInitError.has_value() ? mInitError.value() : NO_INIT;
78 }
79 
requestNextVsync()80 status_t DisplayEventReceiver::requestNextVsync() {
81     if (mEventConnection != nullptr) {
82         mEventConnection->requestNextVsync();
83         return NO_ERROR;
84     }
85     return mInitError.has_value() ? mInitError.value() : NO_INIT;
86 }
87 
getLatestVsyncEventData(ParcelableVsyncEventData * outVsyncEventData) const88 status_t DisplayEventReceiver::getLatestVsyncEventData(
89         ParcelableVsyncEventData* outVsyncEventData) const {
90     if (mEventConnection != nullptr) {
91         auto status = mEventConnection->getLatestVsyncEventData(outVsyncEventData);
92         if (!status.isOk()) {
93             ALOGE("Failed to get latest vsync event data: %s", status.exceptionMessage().c_str());
94             return status.transactionError();
95         }
96         return NO_ERROR;
97     }
98     return NO_INIT;
99 }
100 
getEvents(DisplayEventReceiver::Event * events,size_t count)101 ssize_t DisplayEventReceiver::getEvents(DisplayEventReceiver::Event* events,
102         size_t count) {
103     return DisplayEventReceiver::getEvents(mDataChannel.get(), events, count);
104 }
105 
getEvents(gui::BitTube * dataChannel,Event * events,size_t count)106 ssize_t DisplayEventReceiver::getEvents(gui::BitTube* dataChannel,
107         Event* events, size_t count)
108 {
109     return gui::BitTube::recvObjects(dataChannel, events, count);
110 }
111 
sendEvents(Event const * events,size_t count)112 ssize_t DisplayEventReceiver::sendEvents(Event const* events, size_t count) {
113     return DisplayEventReceiver::sendEvents(mDataChannel.get(), events, count);
114 }
115 
sendEvents(gui::BitTube * dataChannel,Event const * events,size_t count)116 ssize_t DisplayEventReceiver::sendEvents(gui::BitTube* dataChannel,
117         Event const* events, size_t count)
118 {
119     return gui::BitTube::sendObjects(dataChannel, events, count);
120 }
121 
122 // ---------------------------------------------------------------------------
123 
124 }; // namespace android
125