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 30 DispSyncSource::DispSyncSource(DispSync* dispSync, nsecs_t phaseOffset, bool traceVsync, 31 const char* name) 32 : mName(name), 33 mTraceVsync(traceVsync), 34 mVsyncOnLabel(base::StringPrintf("VsyncOn-%s", name)), 35 mVsyncEventLabel(base::StringPrintf("VSYNC-%s", name)), 36 mDispSync(dispSync), 37 mPhaseOffset(phaseOffset) {} 38 39 void DispSyncSource::setVSyncEnabled(bool enable) { 40 std::lock_guard lock(mVsyncMutex); 41 if (enable) { 42 status_t err = mDispSync->addEventListener(mName, mPhaseOffset, 43 static_cast<DispSync::Callback*>(this), 44 mLastCallbackTime); 45 if (err != NO_ERROR) { 46 ALOGE("error registering vsync callback: %s (%d)", strerror(-err), err); 47 } 48 // ATRACE_INT(mVsyncOnLabel.c_str(), 1); 49 } else { 50 status_t err = mDispSync->removeEventListener(static_cast<DispSync::Callback*>(this), 51 &mLastCallbackTime); 52 if (err != NO_ERROR) { 53 ALOGE("error unregistering vsync callback: %s (%d)", strerror(-err), err); 54 } 55 // ATRACE_INT(mVsyncOnLabel.c_str(), 0); 56 } 57 mEnabled = enable; 58 } 59 60 void DispSyncSource::setCallback(VSyncSource::Callback* callback) { 61 std::lock_guard lock(mCallbackMutex); 62 mCallback = callback; 63 } 64 65 void DispSyncSource::setPhaseOffset(nsecs_t phaseOffset) { 66 std::lock_guard lock(mVsyncMutex); 67 68 // Normalize phaseOffset to [0, period) 69 auto period = mDispSync->getPeriod(); 70 phaseOffset %= period; 71 if (phaseOffset < 0) { 72 // If we're here, then phaseOffset is in (-period, 0). After this 73 // operation, it will be in (0, period) 74 phaseOffset += period; 75 } 76 mPhaseOffset = phaseOffset; 77 78 // If we're not enabled, we don't need to mess with the listeners 79 if (!mEnabled) { 80 return; 81 } 82 83 status_t err = 84 mDispSync->changePhaseOffset(static_cast<DispSync::Callback*>(this), mPhaseOffset); 85 if (err != NO_ERROR) { 86 ALOGE("error changing vsync offset: %s (%d)", strerror(-err), err); 87 } 88 } 89 90 void DispSyncSource::onDispSyncEvent(nsecs_t when) { 91 VSyncSource::Callback* callback; 92 { 93 std::lock_guard lock(mCallbackMutex); 94 callback = mCallback; 95 96 if (mTraceVsync) { 97 mValue = (mValue + 1) % 2; 98 ATRACE_INT(mVsyncEventLabel.c_str(), mValue); 99 } 100 } 101 102 if (callback != nullptr) { 103 callback->onVSyncEvent(when); 104 } 105 } 106 107 } // namespace android
