1 /*
2 * Copyright 2018 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 #define ATRACE_TAG ATRACE_TAG_GRAPHICS
18
19 #include "DispSyncSource.h"
20
21 #include <android-base/stringprintf.h>
22 #include <utils/Trace.h>
23 #include <mutex>
24
25 #include "DispSync.h"
26 #include "EventThread.h"
27
28 namespace android {
29
DispSyncSource(DispSync * dispSync,nsecs_t phaseOffset,nsecs_t offsetThresholdForNextVsync,bool traceVsync,const char * name)30 DispSyncSource::DispSyncSource(DispSync* dispSync, nsecs_t phaseOffset,
31 nsecs_t offsetThresholdForNextVsync, bool traceVsync,
32 const char* name)
33 : mName(name),
34 mTraceVsync(traceVsync),
35 mVsyncOnLabel(base::StringPrintf("VsyncOn-%s", name)),
36 mVsyncEventLabel(base::StringPrintf("VSYNC-%s", name)),
37 mVsyncOffsetLabel(base::StringPrintf("VsyncOffset-%s", name)),
38 mVsyncNegativeOffsetLabel(base::StringPrintf("VsyncNegativeOffset-%s", name)),
39 mDispSync(dispSync),
40 mPhaseOffset(phaseOffset),
41 mOffsetThresholdForNextVsync(offsetThresholdForNextVsync) {}
42
setVSyncEnabled(bool enable)43 void DispSyncSource::setVSyncEnabled(bool enable) {
44 std::lock_guard lock(mVsyncMutex);
45 if (enable) {
46 tracePhaseOffset();
47 status_t err = mDispSync->addEventListener(mName, mPhaseOffset,
48 static_cast<DispSync::Callback*>(this),
49 mLastCallbackTime);
50 if (err != NO_ERROR) {
51 ALOGE("error registering vsync callback: %s (%d)", strerror(-err), err);
52 }
53 // ATRACE_INT(mVsyncOnLabel.c_str(), 1);
54 } else {
55 status_t err = mDispSync->removeEventListener(static_cast<DispSync::Callback*>(this),
56 &mLastCallbackTime);
57 if (err != NO_ERROR) {
58 ALOGE("error unregistering vsync callback: %s (%d)", strerror(-err), err);
59 }
60 // ATRACE_INT(mVsyncOnLabel.c_str(), 0);
61 }
62 mEnabled = enable;
63 }
64
setCallback(VSyncSource::Callback * callback)65 void DispSyncSource::setCallback(VSyncSource::Callback* callback) {
66 std::lock_guard lock(mCallbackMutex);
67 mCallback = callback;
68 }
69
setPhaseOffset(nsecs_t phaseOffset)70 void DispSyncSource::setPhaseOffset(nsecs_t phaseOffset) {
71 std::lock_guard lock(mVsyncMutex);
72 const nsecs_t period = mDispSync->getPeriod();
73 // Check if offset should be handled as negative
74 if (phaseOffset >= mOffsetThresholdForNextVsync) {
75 phaseOffset -= period;
76 }
77
78 // Normalize phaseOffset to [-period, period)
79 const int numPeriods = phaseOffset / period;
80 phaseOffset -= numPeriods * period;
81 if (mPhaseOffset == phaseOffset) {
82 return;
83 }
84
85 mPhaseOffset = phaseOffset;
86 tracePhaseOffset();
87
88 // If we're not enabled, we don't need to mess with the listeners
89 if (!mEnabled) {
90 return;
91 }
92
93 status_t err =
94 mDispSync->changePhaseOffset(static_cast<DispSync::Callback*>(this), mPhaseOffset);
95 if (err != NO_ERROR) {
96 ALOGE("error changing vsync offset: %s (%d)", strerror(-err), err);
97 }
98 }
99
onDispSyncEvent(nsecs_t when)100 void DispSyncSource::onDispSyncEvent(nsecs_t when) {
101 VSyncSource::Callback* callback;
102 {
103 std::lock_guard lock(mCallbackMutex);
104 callback = mCallback;
105 }
106
107 if (mTraceVsync) {
108 mValue = (mValue + 1) % 2;
109 ATRACE_INT(mVsyncEventLabel.c_str(), mValue);
110 }
111
112 if (callback != nullptr) {
113 callback->onVSyncEvent(when);
114 }
115 }
116
tracePhaseOffset()117 void DispSyncSource::tracePhaseOffset() {
118 if (mPhaseOffset > 0) {
119 ATRACE_INT(mVsyncOffsetLabel.c_str(), mPhaseOffset);
120 ATRACE_INT(mVsyncNegativeOffsetLabel.c_str(), 0);
121 } else {
122 ATRACE_INT(mVsyncOffsetLabel.c_str(), 0);
123 ATRACE_INT(mVsyncNegativeOffsetLabel.c_str(), -mPhaseOffset);
124 }
125 }
126
127 } // namespace android
128