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/*
* Copyright 2018 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 ATRACE_TAG ATRACE_TAG_GRAPHICS
#include "DispSyncSource.h"
#include <android-base/stringprintf.h>
#include <utils/Trace.h>
#include <mutex>
#include "EventThread.h"
#include "VsyncController.h"
namespace android::scheduler {
using base::StringAppendF;
using namespace std::chrono_literals;
class CallbackRepeater {
public:
CallbackRepeater(VSyncDispatch& dispatch, VSyncDispatch::Callback cb, const char* name,
std::chrono::nanoseconds workDuration, std::chrono::nanoseconds readyDuration,
std::chrono::nanoseconds notBefore)
: mName(name),
mCallback(cb),
mRegistration(dispatch,
std::bind(&CallbackRepeater::callback, this, std::placeholders::_1,
std::placeholders::_2, std::placeholders::_3),
mName),
mStarted(false),
mWorkDuration(workDuration),
mReadyDuration(readyDuration),
mLastCallTime(notBefore) {}
~CallbackRepeater() {
std::lock_guard lock(mMutex);
mRegistration.cancel();
}
void start(std::chrono::nanoseconds workDuration, std::chrono::nanoseconds readyDuration) {
std::lock_guard lock(mMutex);
mStarted = true;
mWorkDuration = workDuration;
mReadyDuration = readyDuration;
auto const scheduleResult =
mRegistration.schedule({.workDuration = mWorkDuration.count(),
.readyDuration = mReadyDuration.count(),
.earliestVsync = mLastCallTime.count()});
LOG_ALWAYS_FATAL_IF((!scheduleResult.has_value()), "Error scheduling callback");
}
void stop() {
std::lock_guard lock(mMutex);
LOG_ALWAYS_FATAL_IF(!mStarted, "DispSyncInterface misuse: callback already stopped");
mStarted = false;
mRegistration.cancel();
}
void dump(std::string& result) const {
std::lock_guard lock(mMutex);
const auto relativeLastCallTime =
mLastCallTime - std::chrono::steady_clock::now().time_since_epoch();
StringAppendF(&result, "\t%s: ", mName.c_str());
StringAppendF(&result, "mWorkDuration=%.2f mReadyDuration=%.2f last vsync time ",
mWorkDuration.count() / 1e6f, mReadyDuration.count() / 1e6f);
StringAppendF(&result, "%.2fms relative to now (%s)\n", relativeLastCallTime.count() / 1e6f,
mStarted ? "running" : "stopped");
}
private:
void callback(nsecs_t vsyncTime, nsecs_t wakeupTime, nsecs_t readyTime) {
{
std::lock_guard lock(mMutex);
mLastCallTime = std::chrono::nanoseconds(vsyncTime);
}
mCallback(vsyncTime, wakeupTime, readyTime);
{
std::lock_guard lock(mMutex);
if (!mStarted) {
return;
}
auto const scheduleResult =
mRegistration.schedule({.workDuration = mWorkDuration.count(),
.readyDuration = mReadyDuration.count(),
.earliestVsync = vsyncTime});
LOG_ALWAYS_FATAL_IF(!scheduleResult.has_value(), "Error rescheduling callback");
}
}
const std::string mName;
scheduler::VSyncDispatch::Callback mCallback;
mutable std::mutex mMutex;
VSyncCallbackRegistration mRegistration GUARDED_BY(mMutex);
bool mStarted GUARDED_BY(mMutex) = false;
std::chrono::nanoseconds mWorkDuration GUARDED_BY(mMutex) = 0ns;
std::chrono::nanoseconds mReadyDuration GUARDED_BY(mMutex) = 0ns;
std::chrono::nanoseconds mLastCallTime GUARDED_BY(mMutex) = 0ns;
};
DispSyncSource::DispSyncSource(scheduler::VSyncDispatch& vSyncDispatch,
std::chrono::nanoseconds workDuration,
std::chrono::nanoseconds readyDuration, bool traceVsync,
const char* name)
: mName(name),
mValue(base::StringPrintf("VSYNC-%s", name), 0),
mTraceVsync(traceVsync),
mVsyncOnLabel(base::StringPrintf("VsyncOn-%s", name)),
mWorkDuration(base::StringPrintf("VsyncWorkDuration-%s", name), workDuration),
mReadyDuration(readyDuration) {
mCallbackRepeater =
std::make_unique<CallbackRepeater>(vSyncDispatch,
std::bind(&DispSyncSource::onVsyncCallback, this,
std::placeholders::_1,
std::placeholders::_2,
std::placeholders::_3),
name, workDuration, readyDuration,
std::chrono::steady_clock::now().time_since_epoch());
}
DispSyncSource::~DispSyncSource() = default;
void DispSyncSource::setVSyncEnabled(bool enable) {
std::lock_guard lock(mVsyncMutex);
if (enable) {
mCallbackRepeater->start(mWorkDuration, mReadyDuration);
// ATRACE_INT(mVsyncOnLabel.c_str(), 1);
} else {
mCallbackRepeater->stop();
// ATRACE_INT(mVsyncOnLabel.c_str(), 0);
}
mEnabled = enable;
}
void DispSyncSource::setCallback(VSyncSource::Callback* callback) {
std::lock_guard lock(mCallbackMutex);
mCallback = callback;
}
void DispSyncSource::setDuration(std::chrono::nanoseconds workDuration,
std::chrono::nanoseconds readyDuration) {
std::lock_guard lock(mVsyncMutex);
mWorkDuration = workDuration;
mReadyDuration = readyDuration;
// If we're not enabled, we don't need to mess with the listeners
if (!mEnabled) {
return;
}
mCallbackRepeater->start(mWorkDuration, mReadyDuration);
}
void DispSyncSource::onVsyncCallback(nsecs_t vsyncTime, nsecs_t targetWakeupTime,
nsecs_t readyTime) {
VSyncSource::Callback* callback;
{
std::lock_guard lock(mCallbackMutex);
callback = mCallback;
}
if (mTraceVsync) {
mValue = (mValue + 1) % 2;
}
if (callback != nullptr) {
callback->onVSyncEvent(targetWakeupTime, vsyncTime, readyTime);
}
}
void DispSyncSource::dump(std::string& result) const {
std::lock_guard lock(mVsyncMutex);
StringAppendF(&result, "DispSyncSource: %s(%s)\n", mName, mEnabled ? "enabled" : "disabled");
}
} // namespace android::scheduler
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