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
DisplayEventReceiver(ISurfaceComposer::VsyncSource vsyncSource)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
~DisplayEventReceiver()46 DisplayEventReceiver::~DisplayEventReceiver() {
47 }
48
initCheck() const49 status_t DisplayEventReceiver::initCheck() const {
50 if (mDataChannel != NULL)
51 return NO_ERROR;
52 return NO_INIT;
53 }
54
getFd() const55 int DisplayEventReceiver::getFd() const {
56 if (mDataChannel == NULL)
57 return NO_INIT;
58
59 return mDataChannel->getFd();
60 }
61
setVsyncRate(uint32_t count)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
requestNextVsync()73 status_t DisplayEventReceiver::requestNextVsync() {
74 if (mEventConnection != NULL) {
75 mEventConnection->requestNextVsync();
76 return NO_ERROR;
77 }
78 return NO_INIT;
79 }
80
81
getEvents(DisplayEventReceiver::Event * events,size_t count)82 ssize_t DisplayEventReceiver::getEvents(DisplayEventReceiver::Event* events,
83 size_t count) {
84 return DisplayEventReceiver::getEvents(mDataChannel.get(), events, count);
85 }
86
getEvents(gui::BitTube * dataChannel,Event * events,size_t count)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
sendEvents(gui::BitTube * dataChannel,Event const * events,size_t count)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