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/*
* Copyright 2016 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.
*/
#include <gui/FrameTimestamps.h>
#define LOG_TAG "FrameEvents"
#include <LibGuiProperties.sysprop.h>
#include <android-base/stringprintf.h>
#include <cutils/compiler.h> // For CC_[UN]LIKELY
#include <inttypes.h>
#include <utils/Log.h>
#include <algorithm>
#include <limits>
#include <numeric>
namespace android {
using base::StringAppendF;
// ============================================================================
// FrameEvents
// ============================================================================
bool FrameEvents::hasPostedInfo() const {
return FrameEvents::isValidTimestamp(postedTime);
}
bool FrameEvents::hasRequestedPresentInfo() const {
return FrameEvents::isValidTimestamp(requestedPresentTime);
}
bool FrameEvents::hasLatchInfo() const {
return FrameEvents::isValidTimestamp(latchTime);
}
bool FrameEvents::hasFirstRefreshStartInfo() const {
return FrameEvents::isValidTimestamp(firstRefreshStartTime);
}
bool FrameEvents::hasLastRefreshStartInfo() const {
// The last refresh start time may continue to update until a new frame
// is latched. We know we have the final value once the release info is set.
return addReleaseCalled;
}
bool FrameEvents::hasDequeueReadyInfo() const {
return FrameEvents::isValidTimestamp(dequeueReadyTime);
}
bool FrameEvents::hasAcquireInfo() const {
return acquireFence->isValid();
}
bool FrameEvents::hasGpuCompositionDoneInfo() const {
// We may not get a gpuCompositionDone in addPostComposite if
// client/gles compositing isn't needed.
return addPostCompositeCalled;
}
bool FrameEvents::hasDisplayPresentInfo() const {
// We may not get a displayPresent in addPostComposite for HWC1.
return addPostCompositeCalled;
}
bool FrameEvents::hasReleaseInfo() const {
return addReleaseCalled;
}
void FrameEvents::checkFencesForCompletion() {
acquireFence->getSignalTime();
gpuCompositionDoneFence->getSignalTime();
displayPresentFence->getSignalTime();
releaseFence->getSignalTime();
}
static void dumpFenceTime(std::string& outString, const char* name, bool pending,
const FenceTime& fenceTime) {
StringAppendF(&outString, "--- %s", name);
nsecs_t signalTime = fenceTime.getCachedSignalTime();
if (Fence::isValidTimestamp(signalTime)) {
StringAppendF(&outString, "%" PRId64 "\n", signalTime);
} else if (pending || signalTime == Fence::SIGNAL_TIME_PENDING) {
outString.append("Pending\n");
} else if (&fenceTime == FenceTime::NO_FENCE.get()){
outString.append("N/A\n");
} else {
outString.append("Error\n");
}
}
void FrameEvents::dump(std::string& outString) const {
if (!valid) {
return;
}
StringAppendF(&outString, "-- Frame %" PRIu64 "\n", frameNumber);
StringAppendF(&outString, "--- Posted \t%" PRId64 "\n", postedTime);
StringAppendF(&outString, "--- Req. Present\t%" PRId64 "\n", requestedPresentTime);
outString.append("--- Latched \t");
if (FrameEvents::isValidTimestamp(latchTime)) {
StringAppendF(&outString, "%" PRId64 "\n", latchTime);
} else {
outString.append("Pending\n");
}
outString.append("--- Refresh (First)\t");
if (FrameEvents::isValidTimestamp(firstRefreshStartTime)) {
StringAppendF(&outString, "%" PRId64 "\n", firstRefreshStartTime);
} else {
outString.append("Pending\n");
}
outString.append("--- Refresh (Last)\t");
if (FrameEvents::isValidTimestamp(lastRefreshStartTime)) {
StringAppendF(&outString, "%" PRId64 "\n", lastRefreshStartTime);
} else {
outString.append("Pending\n");
}
dumpFenceTime(outString, "Acquire \t",
true, *acquireFence);
dumpFenceTime(outString, "GPU Composite Done\t",
!addPostCompositeCalled, *gpuCompositionDoneFence);
dumpFenceTime(outString, "Display Present \t",
!addPostCompositeCalled, *displayPresentFence);
outString.append("--- DequeueReady \t");
if (FrameEvents::isValidTimestamp(dequeueReadyTime)) {
StringAppendF(&outString, "%" PRId64 "\n", dequeueReadyTime);
} else {
outString.append("Pending\n");
}
dumpFenceTime(outString, "Release \t",
true, *releaseFence);
}
// ============================================================================
// FrameEventHistory
// ============================================================================
namespace {
struct FrameNumberEqual {
explicit FrameNumberEqual(uint64_t frameNumber) : mFrameNumber(frameNumber) {}
bool operator()(const FrameEvents& frame) {
return frame.valid && mFrameNumber == frame.frameNumber;
}
const uint64_t mFrameNumber;
};
} // namespace
const size_t FrameEventHistory::MAX_FRAME_HISTORY =
sysprop::LibGuiProperties::frame_event_history_size().value_or(8);
FrameEventHistory::FrameEventHistory() : mFrames(std::vector<FrameEvents>(MAX_FRAME_HISTORY)) {}
FrameEventHistory::~FrameEventHistory() = default;
FrameEvents* FrameEventHistory::getFrame(uint64_t frameNumber) {
auto frame = std::find_if(
mFrames.begin(), mFrames.end(), FrameNumberEqual(frameNumber));
return frame == mFrames.end() ? nullptr : &(*frame);
}
FrameEvents* FrameEventHistory::getFrame(uint64_t frameNumber, size_t* iHint) {
*iHint = std::min(*iHint, mFrames.size());
auto hint = mFrames.begin() + *iHint;
auto frame = std::find_if(
hint, mFrames.end(), FrameNumberEqual(frameNumber));
if (frame == mFrames.end()) {
frame = std::find_if(
mFrames.begin(), hint, FrameNumberEqual(frameNumber));
if (frame == hint) {
return nullptr;
}
}
*iHint = static_cast<size_t>(std::distance(mFrames.begin(), frame));
return &(*frame);
}
void FrameEventHistory::checkFencesForCompletion() {
for (auto& frame : mFrames) {
frame.checkFencesForCompletion();
}
}
// Uses !|valid| as the MSB.
static bool FrameNumberLessThan(
const FrameEvents& lhs, const FrameEvents& rhs) {
if (lhs.valid == rhs.valid) {
return lhs.frameNumber < rhs.frameNumber;
}
return lhs.valid;
}
void FrameEventHistory::dump(std::string& outString) const {
auto earliestFrame = std::min_element(
mFrames.begin(), mFrames.end(), &FrameNumberLessThan);
if (!earliestFrame->valid) {
outString.append("-- N/A\n");
return;
}
for (auto frame = earliestFrame; frame != mFrames.end(); ++frame) {
frame->dump(outString);
}
for (auto frame = mFrames.begin(); frame != earliestFrame; ++frame) {
frame->dump(outString);
}
}
// ============================================================================
// ProducerFrameEventHistory
// ============================================================================
ProducerFrameEventHistory::~ProducerFrameEventHistory() = default;
nsecs_t ProducerFrameEventHistory::snapToNextTick(
nsecs_t timestamp, nsecs_t tickPhase, nsecs_t tickInterval) {
nsecs_t tickOffset = (tickPhase - timestamp) % tickInterval;
// Integer modulo rounds towards 0 and not -inf before taking the remainder,
// so adjust the offset if it is negative.
if (tickOffset < 0) {
tickOffset += tickInterval;
}
return timestamp + tickOffset;
}
nsecs_t ProducerFrameEventHistory::getNextCompositeDeadline(
const nsecs_t now) const{
return snapToNextTick(
now, mCompositorTiming.deadline, mCompositorTiming.interval);
}
void ProducerFrameEventHistory::updateAcquireFence(
uint64_t frameNumber, std::shared_ptr<FenceTime>&& acquire) {
FrameEvents* frame = getFrame(frameNumber, &mAcquireOffset);
if (frame == nullptr) {
ALOGE("updateAcquireFence: Did not find frame.");
return;
}
if (acquire->isValid()) {
mAcquireTimeline.push(acquire);
frame->acquireFence = std::move(acquire);
} else {
// If there isn't an acquire fence, assume that buffer was
// ready for the consumer when posted.
frame->acquireFence = std::make_shared<FenceTime>(frame->postedTime);
}
}
void ProducerFrameEventHistory::applyDelta(
const FrameEventHistoryDelta& delta) {
mCompositorTiming = delta.mCompositorTiming;
for (auto& d : delta.mDeltas) {
// Avoid out-of-bounds access.
if (CC_UNLIKELY(d.mIndex >= mFrames.size())) {
ALOGE("applyDelta: Bad index.");
return;
}
FrameEvents& frame = mFrames[d.mIndex];
frame.addPostCompositeCalled = d.mAddPostCompositeCalled != 0;
frame.addReleaseCalled = d.mAddReleaseCalled != 0;
frame.postedTime = d.mPostedTime;
frame.requestedPresentTime = d.mRequestedPresentTime;
frame.latchTime = d.mLatchTime;
frame.firstRefreshStartTime = d.mFirstRefreshStartTime;
frame.lastRefreshStartTime = d.mLastRefreshStartTime;
frame.dequeueReadyTime = d.mDequeueReadyTime;
if (frame.frameNumber != d.mFrameNumber) {
// We got a new frame. Initialize some of the fields.
frame.frameNumber = d.mFrameNumber;
frame.acquireFence = FenceTime::NO_FENCE;
frame.gpuCompositionDoneFence = FenceTime::NO_FENCE;
frame.displayPresentFence = FenceTime::NO_FENCE;
frame.releaseFence = FenceTime::NO_FENCE;
// The consumer only sends valid frames.
frame.valid = true;
}
applyFenceDelta(&mGpuCompositionDoneTimeline,
&frame.gpuCompositionDoneFence, d.mGpuCompositionDoneFence);
applyFenceDelta(&mPresentTimeline,
&frame.displayPresentFence, d.mDisplayPresentFence);
applyFenceDelta(&mReleaseTimeline,
&frame.releaseFence, d.mReleaseFence);
}
}
void ProducerFrameEventHistory::updateSignalTimes() {
mAcquireTimeline.updateSignalTimes();
mGpuCompositionDoneTimeline.updateSignalTimes();
mPresentTimeline.updateSignalTimes();
mReleaseTimeline.updateSignalTimes();
}
void ProducerFrameEventHistory::applyFenceDelta(FenceTimeline* timeline,
std::shared_ptr<FenceTime>* dst, const FenceTime::Snapshot& src) const {
if (CC_UNLIKELY(dst == nullptr || dst->get() == nullptr)) {
ALOGE("applyFenceDelta: dst is null.");
return;
}
switch (src.state) {
case FenceTime::Snapshot::State::EMPTY:
return;
case FenceTime::Snapshot::State::FENCE:
ALOGE_IF((*dst)->isValid(), "applyFenceDelta: Unexpected fence.");
*dst = createFenceTime(src.fence);
timeline->push(*dst);
return;
case FenceTime::Snapshot::State::SIGNAL_TIME:
if ((*dst)->isValid()) {
(*dst)->applyTrustedSnapshot(src);
} else {
*dst = std::make_shared<FenceTime>(src.signalTime);
}
return;
}
}
std::shared_ptr<FenceTime> ProducerFrameEventHistory::createFenceTime(
const sp<Fence>& fence) const {
return std::make_shared<FenceTime>(fence);
}
// ============================================================================
// ConsumerFrameEventHistory
// ============================================================================
ConsumerFrameEventHistory::ConsumerFrameEventHistory()
: mFramesDirty(std::vector<FrameEventDirtyFields>(MAX_FRAME_HISTORY)) {}
ConsumerFrameEventHistory::~ConsumerFrameEventHistory() = default;
void ConsumerFrameEventHistory::onDisconnect() {
mCurrentConnectId++;
mProducerWantsEvents = false;
}
void ConsumerFrameEventHistory::setProducerWantsEvents() {
mProducerWantsEvents = true;
}
void ConsumerFrameEventHistory::initializeCompositorTiming(
const CompositorTiming& compositorTiming) {
mCompositorTiming = compositorTiming;
}
void ConsumerFrameEventHistory::addQueue(const NewFrameEventsEntry& newEntry) {
// Overwrite all fields of the frame with default values unless set here.
FrameEvents newTimestamps;
newTimestamps.connectId = mCurrentConnectId;
newTimestamps.frameNumber = newEntry.frameNumber;
newTimestamps.postedTime = newEntry.postedTime;
newTimestamps.requestedPresentTime = newEntry.requestedPresentTime;
newTimestamps.acquireFence = newEntry.acquireFence;
newTimestamps.valid = true;
mFrames[mQueueOffset] = newTimestamps;
// Note: We avoid sending the acquire fence back to the caller since
// they have the original one already, so there is no need to set the
// acquire dirty bit.
mFramesDirty[mQueueOffset].setDirty<FrameEvent::POSTED>();
mQueueOffset = (mQueueOffset + 1) % mFrames.size();
}
void ConsumerFrameEventHistory::addLatch(
uint64_t frameNumber, nsecs_t latchTime) {
FrameEvents* frame = getFrame(frameNumber, &mCompositionOffset);
if (frame == nullptr) {
ALOGE_IF(mProducerWantsEvents, "addLatch: Did not find frame.");
return;
}
frame->latchTime = latchTime;
mFramesDirty[mCompositionOffset].setDirty<FrameEvent::LATCH>();
}
void ConsumerFrameEventHistory::addPreComposition(
uint64_t frameNumber, nsecs_t refreshStartTime) {
FrameEvents* frame = getFrame(frameNumber, &mCompositionOffset);
if (frame == nullptr) {
ALOGE_IF(mProducerWantsEvents,
"addPreComposition: Did not find frame.");
return;
}
frame->lastRefreshStartTime = refreshStartTime;
mFramesDirty[mCompositionOffset].setDirty<FrameEvent::LAST_REFRESH_START>();
if (!FrameEvents::isValidTimestamp(frame->firstRefreshStartTime)) {
frame->firstRefreshStartTime = refreshStartTime;
mFramesDirty[mCompositionOffset].setDirty<FrameEvent::FIRST_REFRESH_START>();
}
}
void ConsumerFrameEventHistory::addPostComposition(uint64_t frameNumber,
const std::shared_ptr<FenceTime>& gpuCompositionDone,
const std::shared_ptr<FenceTime>& displayPresent,
const CompositorTiming& compositorTiming) {
mCompositorTiming = compositorTiming;
FrameEvents* frame = getFrame(frameNumber, &mCompositionOffset);
if (frame == nullptr) {
ALOGE_IF(mProducerWantsEvents,
"addPostComposition: Did not find frame.");
return;
}
// Only get GPU and present info for the first composite.
if (!frame->addPostCompositeCalled) {
frame->addPostCompositeCalled = true;
frame->gpuCompositionDoneFence = gpuCompositionDone;
mFramesDirty[mCompositionOffset].setDirty<FrameEvent::GPU_COMPOSITION_DONE>();
if (!frame->displayPresentFence->isValid()) {
frame->displayPresentFence = displayPresent;
mFramesDirty[mCompositionOffset].setDirty<FrameEvent::DISPLAY_PRESENT>();
}
}
}
void ConsumerFrameEventHistory::addRelease(uint64_t frameNumber,
nsecs_t dequeueReadyTime, std::shared_ptr<FenceTime>&& release) {
FrameEvents* frame = getFrame(frameNumber, &mReleaseOffset);
if (frame == nullptr) {
ALOGE_IF(mProducerWantsEvents, "addRelease: Did not find frame.");
return;
}
frame->addReleaseCalled = true;
frame->dequeueReadyTime = dequeueReadyTime;
frame->releaseFence = std::move(release);
mFramesDirty[mReleaseOffset].setDirty<FrameEvent::RELEASE>();
}
void ConsumerFrameEventHistory::getFrameDelta(FrameEventHistoryDelta* delta,
const std::vector<FrameEvents>::iterator& frame) {
mProducerWantsEvents = true;
size_t i = static_cast<size_t>(std::distance(mFrames.begin(), frame));
if (mFramesDirty[i].anyDirty()) {
// Make sure only to send back deltas for the current connection
// since the producer won't have the correct state to apply a delta
// from a previous connection.
if (mFrames[i].connectId == mCurrentConnectId) {
delta->mDeltas.emplace_back(i, *frame, mFramesDirty[i]);
}
mFramesDirty[i].reset();
}
}
void ConsumerFrameEventHistory::getAndResetDelta(
FrameEventHistoryDelta* delta) {
mProducerWantsEvents = true;
delta->mCompositorTiming = mCompositorTiming;
// Write these in order of frame number so that it is easy to
// add them to a FenceTimeline in the proper order producer side.
delta->mDeltas.reserve(mFramesDirty.size());
auto earliestFrame = std::min_element(
mFrames.begin(), mFrames.end(), &FrameNumberLessThan);
for (auto frame = earliestFrame; frame != mFrames.end(); ++frame) {
getFrameDelta(delta, frame);
}
for (auto frame = mFrames.begin(); frame != earliestFrame; ++frame) {
getFrameDelta(delta, frame);
}
}
// ============================================================================
// FrameEventsDelta
// ============================================================================
FrameEventsDelta::FrameEventsDelta(
size_t index,
const FrameEvents& frameTimestamps,
const FrameEventDirtyFields& dirtyFields)
: mIndex(index),
mFrameNumber(frameTimestamps.frameNumber),
mAddPostCompositeCalled(frameTimestamps.addPostCompositeCalled),
mAddReleaseCalled(frameTimestamps.addReleaseCalled),
mPostedTime(frameTimestamps.postedTime),
mRequestedPresentTime(frameTimestamps.requestedPresentTime),
mLatchTime(frameTimestamps.latchTime),
mFirstRefreshStartTime(frameTimestamps.firstRefreshStartTime),
mLastRefreshStartTime(frameTimestamps.lastRefreshStartTime),
mDequeueReadyTime(frameTimestamps.dequeueReadyTime) {
if (dirtyFields.isDirty<FrameEvent::GPU_COMPOSITION_DONE>()) {
mGpuCompositionDoneFence =
frameTimestamps.gpuCompositionDoneFence->getSnapshot();
}
if (dirtyFields.isDirty<FrameEvent::DISPLAY_PRESENT>()) {
mDisplayPresentFence =
frameTimestamps.displayPresentFence->getSnapshot();
}
if (dirtyFields.isDirty<FrameEvent::RELEASE>()) {
mReleaseFence = frameTimestamps.releaseFence->getSnapshot();
}
}
constexpr size_t FrameEventsDelta::minFlattenedSize() {
return sizeof(FrameEventsDelta::mFrameNumber) +
sizeof(uint16_t) + // mIndex
sizeof(uint8_t) + // mAddPostCompositeCalled
sizeof(uint8_t) + // mAddReleaseCalled
sizeof(FrameEventsDelta::mPostedTime) +
sizeof(FrameEventsDelta::mRequestedPresentTime) +
sizeof(FrameEventsDelta::mLatchTime) +
sizeof(FrameEventsDelta::mFirstRefreshStartTime) +
sizeof(FrameEventsDelta::mLastRefreshStartTime) +
sizeof(FrameEventsDelta::mDequeueReadyTime);
}
// Flattenable implementation
size_t FrameEventsDelta::getFlattenedSize() const {
auto fences = allFences(this);
return minFlattenedSize() +
std::accumulate(fences.begin(), fences.end(), size_t(0),
[](size_t a, const FenceTime::Snapshot* fence) {
return a + fence->getFlattenedSize();
});
}
size_t FrameEventsDelta::getFdCount() const {
auto fences = allFences(this);
return std::accumulate(fences.begin(), fences.end(), size_t(0),
[](size_t a, const FenceTime::Snapshot* fence) {
return a + fence->getFdCount();
});
}
status_t FrameEventsDelta::flatten(void*& buffer, size_t& size, int*& fds,
size_t& count) const {
if (size < getFlattenedSize() || count < getFdCount()) {
return NO_MEMORY;
}
if (mIndex >= FrameEventHistory::MAX_FRAME_HISTORY ||
mIndex > std::numeric_limits<uint16_t>::max()) {
return BAD_VALUE;
}
FlattenableUtils::write(buffer, size, mFrameNumber);
// These are static_cast to uint16_t/uint8_t for alignment.
FlattenableUtils::write(buffer, size, static_cast<uint16_t>(mIndex));
FlattenableUtils::write(
buffer, size, static_cast<uint8_t>(mAddPostCompositeCalled));
FlattenableUtils::write(
buffer, size, static_cast<uint8_t>(mAddReleaseCalled));
FlattenableUtils::write(buffer, size, mPostedTime);
FlattenableUtils::write(buffer, size, mRequestedPresentTime);
FlattenableUtils::write(buffer, size, mLatchTime);
FlattenableUtils::write(buffer, size, mFirstRefreshStartTime);
FlattenableUtils::write(buffer, size, mLastRefreshStartTime);
FlattenableUtils::write(buffer, size, mDequeueReadyTime);
// Fences
for (auto fence : allFences(this)) {
status_t status = fence->flatten(buffer, size, fds, count);
if (status != NO_ERROR) {
return status;
}
}
return NO_ERROR;
}
status_t FrameEventsDelta::unflatten(void const*& buffer, size_t& size,
int const*& fds, size_t& count) {
if (size < minFlattenedSize()) {
return NO_MEMORY;
}
FlattenableUtils::read(buffer, size, mFrameNumber);
// These were written as uint16_t/uint8_t for alignment.
uint16_t temp16 = 0;
FlattenableUtils::read(buffer, size, temp16);
mIndex = temp16;
if (mIndex >= FrameEventHistory::MAX_FRAME_HISTORY) {
return BAD_VALUE;
}
uint8_t temp8 = 0;
FlattenableUtils::read(buffer, size, temp8);
mAddPostCompositeCalled = static_cast<bool>(temp8);
FlattenableUtils::read(buffer, size, temp8);
mAddReleaseCalled = static_cast<bool>(temp8);
FlattenableUtils::read(buffer, size, mPostedTime);
FlattenableUtils::read(buffer, size, mRequestedPresentTime);
FlattenableUtils::read(buffer, size, mLatchTime);
FlattenableUtils::read(buffer, size, mFirstRefreshStartTime);
FlattenableUtils::read(buffer, size, mLastRefreshStartTime);
FlattenableUtils::read(buffer, size, mDequeueReadyTime);
// Fences
for (auto fence : allFences(this)) {
status_t status = fence->unflatten(buffer, size, fds, count);
if (status != NO_ERROR) {
return status;
}
}
return NO_ERROR;
}
// ============================================================================
// FrameEventHistoryDelta
// ============================================================================
FrameEventHistoryDelta& FrameEventHistoryDelta::operator=(
FrameEventHistoryDelta&& src) noexcept {
mCompositorTiming = src.mCompositorTiming;
if (CC_UNLIKELY(!mDeltas.empty())) {
ALOGE("FrameEventHistoryDelta assign clobbering history.");
}
mDeltas = std::move(src.mDeltas);
return *this;
}
constexpr size_t FrameEventHistoryDelta::minFlattenedSize() {
return sizeof(uint32_t) + // mDeltas.size()
sizeof(mCompositorTiming);
}
size_t FrameEventHistoryDelta::getFlattenedSize() const {
return minFlattenedSize() +
std::accumulate(mDeltas.begin(), mDeltas.end(), size_t(0),
[](size_t a, const FrameEventsDelta& delta) {
return a + delta.getFlattenedSize();
});
}
size_t FrameEventHistoryDelta::getFdCount() const {
return std::accumulate(mDeltas.begin(), mDeltas.end(), size_t(0),
[](size_t a, const FrameEventsDelta& delta) {
return a + delta.getFdCount();
});
}
status_t FrameEventHistoryDelta::flatten(
void*& buffer, size_t& size, int*& fds, size_t& count) const {
if (mDeltas.size() > FrameEventHistory::MAX_FRAME_HISTORY) {
return BAD_VALUE;
}
if (size < getFlattenedSize()) {
return NO_MEMORY;
}
FlattenableUtils::write(buffer, size, mCompositorTiming);
FlattenableUtils::write(
buffer, size, static_cast<uint32_t>(mDeltas.size()));
for (auto& d : mDeltas) {
status_t status = d.flatten(buffer, size, fds, count);
if (status != NO_ERROR) {
return status;
}
}
return NO_ERROR;
}
status_t FrameEventHistoryDelta::unflatten(
void const*& buffer, size_t& size, int const*& fds, size_t& count) {
if (size < minFlattenedSize()) {
return NO_MEMORY;
}
FlattenableUtils::read(buffer, size, mCompositorTiming);
uint32_t deltaCount = 0;
FlattenableUtils::read(buffer, size, deltaCount);
if (deltaCount > FrameEventHistory::MAX_FRAME_HISTORY) {
return BAD_VALUE;
}
mDeltas.resize(deltaCount);
for (auto& d : mDeltas) {
status_t status = d.unflatten(buffer, size, fds, count);
if (status != NO_ERROR) {
return status;
}
}
return NO_ERROR;
}
} // namespace android