1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "DisplayEventDispatcher"
#include <cinttypes>
#include <cstdint>
#include <gui/DisplayEventDispatcher.h>
#include <gui/DisplayEventReceiver.h>
#include <utils/Log.h>
#include <utils/Looper.h>
#include <utils/Timers.h>
namespace android {
// Number of events to read at a time from the DisplayEventDispatcher pipe.
// The value should be large enough that we can quickly drain the pipe
// using just a few large reads.
static const size_t EVENT_BUFFER_SIZE = 100;
DisplayEventDispatcher::DisplayEventDispatcher(
const sp<Looper>& looper, ISurfaceComposer::VsyncSource vsyncSource,
ISurfaceComposer::EventRegistrationFlags eventRegistration)
: mLooper(looper), mReceiver(vsyncSource, eventRegistration), mWaitingForVsync(false) {
ALOGV("dispatcher %p ~ Initializing display event dispatcher.", this);
}
status_t DisplayEventDispatcher::initialize() {
status_t result = mReceiver.initCheck();
if (result) {
ALOGW("Failed to initialize display event receiver, status=%d", result);
return result;
}
if (mLooper != nullptr) {
int rc = mLooper->addFd(mReceiver.getFd(), 0, Looper::EVENT_INPUT, this, NULL);
if (rc < 0) {
return UNKNOWN_ERROR;
}
}
return OK;
}
void DisplayEventDispatcher::dispose() {
ALOGV("dispatcher %p ~ Disposing display event dispatcher.", this);
if (!mReceiver.initCheck() && mLooper != nullptr) {
mLooper->removeFd(mReceiver.getFd());
}
}
status_t DisplayEventDispatcher::scheduleVsync() {
if (!mWaitingForVsync) {
ALOGV("dispatcher %p ~ Scheduling vsync.", this);
// Drain all pending events.
nsecs_t vsyncTimestamp;
PhysicalDisplayId vsyncDisplayId;
uint32_t vsyncCount;
VsyncEventData vsyncEventData;
if (processPendingEvents(&vsyncTimestamp, &vsyncDisplayId, &vsyncCount, &vsyncEventData)) {
ALOGE("dispatcher %p ~ last event processed while scheduling was for %" PRId64 "", this,
ns2ms(static_cast<nsecs_t>(vsyncTimestamp)));
}
status_t status = mReceiver.requestNextVsync();
if (status) {
ALOGW("Failed to request next vsync, status=%d", status);
return status;
}
mWaitingForVsync = true;
}
return OK;
}
void DisplayEventDispatcher::injectEvent(const DisplayEventReceiver::Event& event) {
mReceiver.sendEvents(&event, 1);
}
int DisplayEventDispatcher::getFd() const {
return mReceiver.getFd();
}
int DisplayEventDispatcher::handleEvent(int, int events, void*) {
if (events & (Looper::EVENT_ERROR | Looper::EVENT_HANGUP)) {
ALOGE("Display event receiver pipe was closed or an error occurred. "
"events=0x%x",
events);
return 0; // remove the callback
}
if (!(events & Looper::EVENT_INPUT)) {
ALOGW("Received spurious callback for unhandled poll event. "
"events=0x%x",
events);
return 1; // keep the callback
}
// Drain all pending events, keep the last vsync.
nsecs_t vsyncTimestamp;
PhysicalDisplayId vsyncDisplayId;
uint32_t vsyncCount;
VsyncEventData vsyncEventData;
if (processPendingEvents(&vsyncTimestamp, &vsyncDisplayId, &vsyncCount, &vsyncEventData)) {
ALOGV("dispatcher %p ~ Vsync pulse: timestamp=%" PRId64
", displayId=%s, count=%d, vsyncId=%" PRId64,
this, ns2ms(vsyncTimestamp), to_string(vsyncDisplayId).c_str(), vsyncCount,
vsyncEventData.id);
mWaitingForVsync = false;
dispatchVsync(vsyncTimestamp, vsyncDisplayId, vsyncCount, vsyncEventData);
}
return 1; // keep the callback
}
bool DisplayEventDispatcher::processPendingEvents(nsecs_t* outTimestamp,
PhysicalDisplayId* outDisplayId,
uint32_t* outCount,
VsyncEventData* outVsyncEventData) {
bool gotVsync = false;
DisplayEventReceiver::Event buf[EVENT_BUFFER_SIZE];
ssize_t n;
while ((n = mReceiver.getEvents(buf, EVENT_BUFFER_SIZE)) > 0) {
ALOGV("dispatcher %p ~ Read %d events.", this, int(n));
mFrameRateOverrides.reserve(n);
for (ssize_t i = 0; i < n; i++) {
const DisplayEventReceiver::Event& ev = buf[i];
switch (ev.header.type) {
case DisplayEventReceiver::DISPLAY_EVENT_VSYNC:
// Later vsync events will just overwrite the info from earlier
// ones. That's fine, we only care about the most recent.
gotVsync = true;
*outTimestamp = ev.header.timestamp;
*outDisplayId = ev.header.displayId;
*outCount = ev.vsync.count;
outVsyncEventData->id = ev.vsync.vsyncId;
outVsyncEventData->deadlineTimestamp = ev.vsync.deadlineTimestamp;
outVsyncEventData->frameInterval = ev.vsync.frameInterval;
break;
case DisplayEventReceiver::DISPLAY_EVENT_HOTPLUG:
dispatchHotplug(ev.header.timestamp, ev.header.displayId, ev.hotplug.connected);
break;
case DisplayEventReceiver::DISPLAY_EVENT_MODE_CHANGE:
dispatchModeChanged(ev.header.timestamp, ev.header.displayId,
ev.modeChange.modeId, ev.modeChange.vsyncPeriod);
break;
case DisplayEventReceiver::DISPLAY_EVENT_NULL:
dispatchNullEvent(ev.header.timestamp, ev.header.displayId);
break;
case DisplayEventReceiver::DISPLAY_EVENT_FRAME_RATE_OVERRIDE:
mFrameRateOverrides.emplace_back(ev.frameRateOverride);
break;
case DisplayEventReceiver::DISPLAY_EVENT_FRAME_RATE_OVERRIDE_FLUSH:
dispatchFrameRateOverrides(ev.header.timestamp, ev.header.displayId,
std::move(mFrameRateOverrides));
break;
default:
ALOGW("dispatcher %p ~ ignoring unknown event type %#x", this, ev.header.type);
break;
}
}
}
if (n < 0) {
ALOGW("Failed to get events from display event dispatcher, status=%d", status_t(n));
}
return gotVsync;
}
} // namespace android
|
