diff --git a/libs/gui/ISurfaceComposer.cpp b/libs/gui/ISurfaceComposer.cpp
index 2699368..ae4b74e 100644
--- a/libs/gui/ISurfaceComposer.cpp
+++ b/libs/gui/ISurfaceComposer.cpp
@@ -26,6 +26,7 @@
 #include <gui/ISurfaceComposer.h>
 #include <gui/LayerState.h>
 #include <gui/SchedulingPolicy.h>
+#include <gui/TransactionState.h>
 #include <private/gui/ParcelUtils.h>
 #include <stdint.h>
 #include <sys/types.h>
@@ -60,54 +61,12 @@
 
     virtual ~BpSurfaceComposer();
 
-    status_t setTransactionState(
-            const FrameTimelineInfo& frameTimelineInfo, Vector<ComposerState>& state,
-            Vector<DisplayState>& displays, uint32_t flags, const sp<IBinder>& applyToken,
-            InputWindowCommands commands, int64_t desiredPresentTime, bool isAutoTimestamp,
-            const std::vector<client_cache_t>& uncacheBuffers, bool hasListenerCallbacks,
-            const std::vector<ListenerCallbacks>& listenerCallbacks, uint64_t transactionId,
-            const std::vector<uint64_t>& mergedTransactionIds) override {
+    status_t setTransactionState(TransactionState&& state) override {
         Parcel data, reply;
         data.writeInterfaceToken(ISurfaceComposer::getInterfaceDescriptor());
+        SAFE_PARCEL(state.writeToParcel, &data);
 
-        frameTimelineInfo.writeToParcel(&data);
-
-        SAFE_PARCEL(data.writeUint32, static_cast<uint32_t>(state.size()));
-        for (const auto& s : state) {
-            SAFE_PARCEL(s.write, data);
-        }
-
-        SAFE_PARCEL(data.writeUint32, static_cast<uint32_t>(displays.size()));
-        for (const auto& d : displays) {
-            SAFE_PARCEL(d.write, data);
-        }
-
-        SAFE_PARCEL(data.writeUint32, flags);
-        SAFE_PARCEL(data.writeStrongBinder, applyToken);
-        SAFE_PARCEL(commands.write, data);
-        SAFE_PARCEL(data.writeInt64, desiredPresentTime);
-        SAFE_PARCEL(data.writeBool, isAutoTimestamp);
-        SAFE_PARCEL(data.writeUint32, static_cast<uint32_t>(uncacheBuffers.size()));
-        for (const client_cache_t& uncacheBuffer : uncacheBuffers) {
-            SAFE_PARCEL(data.writeStrongBinder, uncacheBuffer.token.promote());
-            SAFE_PARCEL(data.writeUint64, uncacheBuffer.id);
-        }
-        SAFE_PARCEL(data.writeBool, hasListenerCallbacks);
-
-        SAFE_PARCEL(data.writeVectorSize, listenerCallbacks);
-        for (const auto& [listener, callbackIds] : listenerCallbacks) {
-            SAFE_PARCEL(data.writeStrongBinder, listener);
-            SAFE_PARCEL(data.writeParcelableVector, callbackIds);
-        }
-
-        SAFE_PARCEL(data.writeUint64, transactionId);
-
-        SAFE_PARCEL(data.writeUint32, static_cast<uint32_t>(mergedTransactionIds.size()));
-        for (auto mergedTransactionId : mergedTransactionIds) {
-            SAFE_PARCEL(data.writeUint64, mergedTransactionId);
-        }
-
-        if (flags & ISurfaceComposer::eOneWay) {
+        if (state.mFlags & ISurfaceComposer::eOneWay) {
             return remote()->transact(BnSurfaceComposer::SET_TRANSACTION_STATE,
                     data, &reply, IBinder::FLAG_ONEWAY);
         } else {
@@ -132,75 +91,9 @@
         case SET_TRANSACTION_STATE: {
             CHECK_INTERFACE(ISurfaceComposer, data, reply);
 
-            FrameTimelineInfo frameTimelineInfo;
-            frameTimelineInfo.readFromParcel(&data);
-
-            uint32_t count = 0;
-            SAFE_PARCEL_READ_SIZE(data.readUint32, &count, data.dataSize());
-            Vector<ComposerState> state;
-            state.setCapacity(count);
-            for (size_t i = 0; i < count; i++) {
-                ComposerState s;
-                SAFE_PARCEL(s.read, data);
-                state.add(s);
-            }
-
-            SAFE_PARCEL_READ_SIZE(data.readUint32, &count, data.dataSize());
-            DisplayState d;
-            Vector<DisplayState> displays;
-            displays.setCapacity(count);
-            for (size_t i = 0; i < count; i++) {
-                SAFE_PARCEL(d.read, data);
-                displays.add(d);
-            }
-
-            uint32_t stateFlags = 0;
-            SAFE_PARCEL(data.readUint32, &stateFlags);
-            sp<IBinder> applyToken;
-            SAFE_PARCEL(data.readStrongBinder, &applyToken);
-            InputWindowCommands inputWindowCommands;
-            SAFE_PARCEL(inputWindowCommands.read, data);
-
-            int64_t desiredPresentTime = 0;
-            bool isAutoTimestamp = true;
-            SAFE_PARCEL(data.readInt64, &desiredPresentTime);
-            SAFE_PARCEL(data.readBool, &isAutoTimestamp);
-
-            SAFE_PARCEL_READ_SIZE(data.readUint32, &count, data.dataSize());
-            std::vector<client_cache_t> uncacheBuffers(count);
-            sp<IBinder> tmpBinder;
-            for (size_t i = 0; i < count; i++) {
-                SAFE_PARCEL(data.readNullableStrongBinder, &tmpBinder);
-                uncacheBuffers[i].token = tmpBinder;
-                SAFE_PARCEL(data.readUint64, &uncacheBuffers[i].id);
-            }
-
-            bool hasListenerCallbacks = false;
-            SAFE_PARCEL(data.readBool, &hasListenerCallbacks);
-
-            std::vector<ListenerCallbacks> listenerCallbacks;
-            int32_t listenersSize = 0;
-            SAFE_PARCEL_READ_SIZE(data.readInt32, &listenersSize, data.dataSize());
-            for (int32_t i = 0; i < listenersSize; i++) {
-                SAFE_PARCEL(data.readStrongBinder, &tmpBinder);
-                std::vector<CallbackId> callbackIds;
-                SAFE_PARCEL(data.readParcelableVector, &callbackIds);
-                listenerCallbacks.emplace_back(tmpBinder, callbackIds);
-            }
-
-            uint64_t transactionId = -1;
-            SAFE_PARCEL(data.readUint64, &transactionId);
-
-            SAFE_PARCEL_READ_SIZE(data.readUint32, &count, data.dataSize());
-            std::vector<uint64_t> mergedTransactions(count);
-            for (size_t i = 0; i < count; i++) {
-                SAFE_PARCEL(data.readUint64, &mergedTransactions[i]);
-            }
-
-            return setTransactionState(frameTimelineInfo, state, displays, stateFlags, applyToken,
-                                       std::move(inputWindowCommands), desiredPresentTime,
-                                       isAutoTimestamp, uncacheBuffers, hasListenerCallbacks,
-                                       listenerCallbacks, transactionId, mergedTransactions);
+            TransactionState state;
+            SAFE_PARCEL(state.readFromParcel, &data);
+            return setTransactionState(std::move(state));
         }
         case GET_SCHEDULING_POLICY: {
             gui::SchedulingPolicy policy;
diff --git a/libs/gui/SurfaceComposerClient.cpp b/libs/gui/SurfaceComposerClient.cpp
index e407a63..65313c0 100644
--- a/libs/gui/SurfaceComposerClient.cpp
+++ b/libs/gui/SurfaceComposerClient.cpp
@@ -824,34 +824,25 @@
 // ---------------------------------------------------------------------------
 
 SurfaceComposerClient::Transaction::Transaction() {
-    mId = generateId();
+    mState.mId = generateId();
     mTransactionCompletedListener = TransactionCompletedListener::getInstance();
 }
 
-SurfaceComposerClient::Transaction::Transaction(const Transaction& other)
-      : mId(other.mId),
-        mFlags(other.mFlags),
-        mMayContainBuffer(other.mMayContainBuffer),
-        mDesiredPresentTime(other.mDesiredPresentTime),
-        mIsAutoTimestamp(other.mIsAutoTimestamp),
-        mFrameTimelineInfo(other.mFrameTimelineInfo),
-        mApplyToken(other.mApplyToken) {
-    mDisplayStates = other.mDisplayStates;
-    mComposerStates = other.mComposerStates;
-    mInputWindowCommands = other.mInputWindowCommands;
+SurfaceComposerClient::Transaction::Transaction(const Transaction& other) {
+    mState = other.mState;
     mListenerCallbacks = other.mListenerCallbacks;
     mTransactionCompletedListener = TransactionCompletedListener::getInstance();
 }
 
 void SurfaceComposerClient::Transaction::sanitize(int pid, int uid) {
     uint32_t permissions = LayerStatePermissions::getTransactionPermissions(pid, uid);
-    for (auto& composerState : mComposerStates) {
+    for (auto& composerState : mState.mComposerStates) {
         composerState.state.sanitize(permissions);
     }
-    if (!mInputWindowCommands.empty() &&
+    if (!mState.mInputWindowCommands.empty() &&
         (permissions & layer_state_t::Permission::ACCESS_SURFACE_FLINGER) == 0) {
         ALOGE("Only privileged callers are allowed to send input commands.");
-        mInputWindowCommands.clear();
+        mState.mInputWindowCommands.clear();
     }
 }
 
@@ -866,34 +857,13 @@
 
 
 status_t SurfaceComposerClient::Transaction::readFromParcel(const Parcel* parcel) {
-    const uint64_t transactionId = parcel->readUint64();
-    const uint32_t flags = parcel->readUint32();
-    const int64_t desiredPresentTime = parcel->readInt64();
-    const bool isAutoTimestamp = parcel->readBool();
-    const bool logCallPoints = parcel->readBool();
-    FrameTimelineInfo frameTimelineInfo;
-    frameTimelineInfo.readFromParcel(parcel);
+    TransactionState tmpState;
+    SAFE_PARCEL(tmpState.readFromParcel, parcel);
 
-    sp<IBinder> applyToken;
-    parcel->readNullableStrongBinder(&applyToken);
     size_t count = static_cast<size_t>(parcel->readUint32());
     if (count > parcel->dataSize()) {
         return BAD_VALUE;
     }
-    Vector<DisplayState> displayStates;
-    displayStates.setCapacity(count);
-    for (size_t i = 0; i < count; i++) {
-        DisplayState displayState;
-        if (displayState.read(*parcel) == BAD_VALUE) {
-            return BAD_VALUE;
-        }
-        displayStates.add(displayState);
-    }
-
-    count = static_cast<size_t>(parcel->readUint32());
-    if (count > parcel->dataSize()) {
-        return BAD_VALUE;
-    }
     std::unordered_map<sp<ITransactionCompletedListener>, CallbackInfo, TCLHash> listenerCallbacks;
     listenerCallbacks.reserve(count);
     for (size_t i = 0; i < count; i++) {
@@ -919,57 +889,8 @@
         }
     }
 
-    count = static_cast<size_t>(parcel->readUint32());
-    if (count > parcel->dataSize()) {
-        return BAD_VALUE;
-    }
-    Vector<ComposerState> composerStates;
-    composerStates.setCapacity(count);
-    for (size_t i = 0; i < count; i++) {
-        ComposerState composerState;
-        if (composerState.read(*parcel) == BAD_VALUE) {
-            return BAD_VALUE;
-        }
-        composerStates.add(composerState);
-    }
-
-    InputWindowCommands inputWindowCommands;
-    inputWindowCommands.read(*parcel);
-
-    count = static_cast<size_t>(parcel->readUint32());
-    if (count > parcel->dataSize()) {
-        return BAD_VALUE;
-    }
-    std::vector<client_cache_t> uncacheBuffers(count);
-    for (size_t i = 0; i < count; i++) {
-        sp<IBinder> tmpBinder;
-        SAFE_PARCEL(parcel->readStrongBinder, &tmpBinder);
-        uncacheBuffers[i].token = tmpBinder;
-        SAFE_PARCEL(parcel->readUint64, &uncacheBuffers[i].id);
-    }
-
-    count = static_cast<size_t>(parcel->readUint32());
-    if (count > parcel->dataSize()) {
-        return BAD_VALUE;
-    }
-    std::vector<uint64_t> mergedTransactionIds(count);
-    for (size_t i = 0; i < count; i++) {
-        SAFE_PARCEL(parcel->readUint64, &mergedTransactionIds[i]);
-    }
-
-    // Parsing was successful. Update the object.
-    mId = transactionId;
-    mFlags = flags;
-    mDesiredPresentTime = desiredPresentTime;
-    mIsAutoTimestamp = isAutoTimestamp;
-    mFrameTimelineInfo = frameTimelineInfo;
-    mDisplayStates = std::move(displayStates);
-    mListenerCallbacks = listenerCallbacks;
-    mComposerStates = std::move(composerStates);
-    mInputWindowCommands = inputWindowCommands;
-    mApplyToken = applyToken;
-    mUncacheBuffers = std::move(uncacheBuffers);
-    mMergedTransactionIds = std::move(mergedTransactionIds);
+    mState = std::move(tmpState);
+    mListenerCallbacks = std::move(listenerCallbacks);
     return NO_ERROR;
 }
 
@@ -987,17 +908,7 @@
 
     const_cast<SurfaceComposerClient::Transaction*>(this)->cacheBuffers();
 
-    parcel->writeUint64(mId);
-    parcel->writeUint32(mFlags);
-    parcel->writeInt64(mDesiredPresentTime);
-    parcel->writeBool(mIsAutoTimestamp);
-    parcel->writeBool(mLogCallPoints);
-    mFrameTimelineInfo.writeToParcel(parcel);
-    parcel->writeStrongBinder(mApplyToken);
-    parcel->writeUint32(static_cast<uint32_t>(mDisplayStates.size()));
-    for (auto const& displayState : mDisplayStates) {
-        displayState.write(*parcel);
-    }
+    SAFE_PARCEL(mState.writeToParcel, parcel);
 
     parcel->writeUint32(static_cast<uint32_t>(mListenerCallbacks.size()));
     for (auto const& [listener, callbackInfo] : mListenerCallbacks) {
@@ -1012,24 +923,6 @@
         }
     }
 
-    parcel->writeUint32(static_cast<uint32_t>(mComposerStates.size()));
-    for (auto const& composerState : mComposerStates) {
-        composerState.write(*parcel);
-    }
-
-    mInputWindowCommands.write(*parcel);
-
-    SAFE_PARCEL(parcel->writeUint32, static_cast<uint32_t>(mUncacheBuffers.size()));
-    for (const client_cache_t& uncacheBuffer : mUncacheBuffers) {
-        SAFE_PARCEL(parcel->writeStrongBinder, uncacheBuffer.token.promote());
-        SAFE_PARCEL(parcel->writeUint64, uncacheBuffer.id);
-    }
-
-    SAFE_PARCEL(parcel->writeUint32, static_cast<uint32_t>(mMergedTransactionIds.size()));
-    for (auto mergedTransactionId : mMergedTransactionIds) {
-        SAFE_PARCEL(parcel->writeUint64, mergedTransactionId);
-    }
-
     return NO_ERROR;
 }
 
@@ -1054,50 +947,8 @@
 }
 
 SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::merge(Transaction&& other) {
-    while (mMergedTransactionIds.size() + other.mMergedTransactionIds.size() >
-                   MAX_MERGE_HISTORY_LENGTH - 1 &&
-           mMergedTransactionIds.size() > 0) {
-        mMergedTransactionIds.pop_back();
-    }
-    if (other.mMergedTransactionIds.size() == MAX_MERGE_HISTORY_LENGTH) {
-        mMergedTransactionIds.insert(mMergedTransactionIds.begin(),
-                                     other.mMergedTransactionIds.begin(),
-                                     other.mMergedTransactionIds.end() - 1);
-    } else if (other.mMergedTransactionIds.size() > 0u) {
-        mMergedTransactionIds.insert(mMergedTransactionIds.begin(),
-                                     other.mMergedTransactionIds.begin(),
-                                     other.mMergedTransactionIds.end());
-    }
-    mMergedTransactionIds.insert(mMergedTransactionIds.begin(), other.mId);
-
-    for (auto const& otherState : other.mComposerStates) {
-        if (auto it = std::find_if(mComposerStates.begin(), mComposerStates.end(),
-                                   [&otherState](const auto& composerState) {
-                                       return composerState.state.surface ==
-                                               otherState.state.surface;
-                                   });
-            it != mComposerStates.end()) {
-            if (otherState.state.what & layer_state_t::eBufferChanged) {
-                releaseBufferIfOverwriting(it->state);
-            }
-            it->state.merge(otherState.state);
-        } else {
-            mComposerStates.add(otherState);
-        }
-    }
-
-    for (auto const& state : other.mDisplayStates) {
-        if (auto it = std::find_if(mDisplayStates.begin(), mDisplayStates.end(),
-                                   [&state](const auto& displayState) {
-                                       return displayState.token == state.token;
-                                   });
-            it != mDisplayStates.end()) {
-            it->merge(state);
-        } else {
-            mDisplayStates.add(state);
-        }
-    }
-
+    mState.merge(std::move(other.mState),
+                 std::bind(&Transaction::releaseBufferIfOverwriting, this, std::placeholders::_1));
     for (const auto& [listener, callbackInfo] : other.mListenerCallbacks) {
         auto& [callbackIds, surfaceControls] = callbackInfo;
         mListenerCallbacks[listener].callbackIds.insert(std::make_move_iterator(
@@ -1121,50 +972,21 @@
         }
     }
 
-    for (const auto& cacheId : other.mUncacheBuffers) {
-        mUncacheBuffers.push_back(cacheId);
-    }
-
-    mInputWindowCommands.merge(other.mInputWindowCommands);
-
-    mMayContainBuffer |= other.mMayContainBuffer;
-    mFlags |= other.mFlags;
-    mApplyToken = other.mApplyToken;
-
-    mergeFrameTimelineInfo(mFrameTimelineInfo, other.mFrameTimelineInfo);
-
-    mLogCallPoints |= other.mLogCallPoints;
-    if (mLogCallPoints) {
-        ALOG(LOG_DEBUG, LOG_SURFACE_CONTROL_REGISTRY,
-             "Transaction %" PRIu64 " merged with transaction %" PRIu64, other.getId(), mId);
-    }
-
     other.clear();
     return *this;
 }
 
 void SurfaceComposerClient::Transaction::clear() {
-    mComposerStates.clear();
-    mDisplayStates.clear();
+    mState.clear();
     mListenerCallbacks.clear();
-    mInputWindowCommands.clear();
-    mUncacheBuffers.clear();
-    mMayContainBuffer = false;
-    mDesiredPresentTime = 0;
-    mIsAutoTimestamp = true;
-    mFrameTimelineInfo = {};
-    mApplyToken = nullptr;
-    mMergedTransactionIds.clear();
-    mLogCallPoints = false;
-    mFlags = 0;
 }
 
-uint64_t SurfaceComposerClient::Transaction::getId() {
-    return mId;
+uint64_t SurfaceComposerClient::Transaction::getId() const {
+    return mState.mId;
 }
 
 std::vector<uint64_t> SurfaceComposerClient::Transaction::getMergedTransactionIds() {
-    return mMergedTransactionIds;
+    return mState.mMergedTransactionIds;
 }
 
 void SurfaceComposerClient::doUncacheBufferTransaction(uint64_t cacheId) {
@@ -1173,12 +995,13 @@
     client_cache_t uncacheBuffer;
     uncacheBuffer.token = BufferCache::getInstance().getToken();
     uncacheBuffer.id = cacheId;
-    Vector<ComposerState> composerStates;
-    Vector<DisplayState> displayStates;
-    status_t status = sf->setTransactionState(FrameTimelineInfo{}, composerStates, displayStates,
-                                              ISurfaceComposer::eOneWay,
-                                              Transaction::getDefaultApplyToken(), {}, systemTime(),
-                                              true, {uncacheBuffer}, false, {}, generateId(), {});
+    TransactionState state;
+    state.mId = generateId();
+    state.mApplyToken = Transaction::getDefaultApplyToken();
+    state.mUncacheBuffers.emplace_back(std::move(uncacheBuffer));
+    state.mFlags = ISurfaceComposer::eOneWay;
+    state.mDesiredPresentTime = systemTime();
+    status_t status = sf->setTransactionState(std::move(state));
     if (status != NO_ERROR) {
         ALOGE_AND_TRACE("SurfaceComposerClient::doUncacheBufferTransaction - %s",
                         strerror(-status));
@@ -1186,12 +1009,12 @@
 }
 
 void SurfaceComposerClient::Transaction::cacheBuffers() {
-    if (!mMayContainBuffer) {
+    if (!mState.mMayContainBuffer) {
         return;
     }
 
     size_t count = 0;
-    for (auto& cs : mComposerStates) {
+    for (auto& cs : mState.mComposerStates) {
         layer_state_t* s = &cs.state;
         if (!(s->what & layer_state_t::eBufferChanged)) {
             continue;
@@ -1219,7 +1042,7 @@
             std::optional<client_cache_t> uncacheBuffer;
             cacheId = BufferCache::getInstance().cache(s->bufferData->buffer, uncacheBuffer);
             if (uncacheBuffer) {
-                mUncacheBuffers.push_back(*uncacheBuffer);
+                mState.mUncacheBuffers.emplace_back(*uncacheBuffer);
             }
         }
         s->bufferData->flags |= BufferData::BufferDataChange::cachedBufferChanged;
@@ -1288,8 +1111,7 @@
                                         /*callbackContext=*/nullptr);
     }
 
-    bool hasListenerCallbacks = !mListenerCallbacks.empty();
-    std::vector<ListenerCallbacks> listenerCallbacks;
+    mState.mHasListenerCallbacks = !mListenerCallbacks.empty();
     // For every listener with registered callbacks
     for (const auto& [listener, callbackInfo] : mListenerCallbacks) {
         auto& [callbackIds, surfaceControls] = callbackInfo;
@@ -1298,7 +1120,8 @@
         }
 
         if (surfaceControls.empty()) {
-            listenerCallbacks.emplace_back(IInterface::asBinder(listener), std::move(callbackIds));
+            mState.mListenerCallbacks.emplace_back(IInterface::asBinder(listener),
+                                                   std::move(callbackIds));
         } else {
             // If the listener has any SurfaceControls set on this Transaction update the surface
             // state
@@ -1310,7 +1133,7 @@
                 }
                 std::vector<CallbackId> callbacks(callbackIds.begin(), callbackIds.end());
                 s->what |= layer_state_t::eHasListenerCallbacksChanged;
-                s->listeners.emplace_back(IInterface::asBinder(listener), callbacks);
+                s->listeners.emplace_back(IInterface::asBinder(listener), std::move(callbacks));
             }
         }
     }
@@ -1322,25 +1145,21 @@
             ALOGE("Transaction attempted to set synchronous and one way at the same time"
                   " this is an invalid request. Synchronous will win for safety");
         } else {
-            mFlags |= ISurfaceComposer::eOneWay;
+            mState.mFlags |= ISurfaceComposer::eOneWay;
         }
     }
 
     // If both ISurfaceComposer::eEarlyWakeupStart and ISurfaceComposer::eEarlyWakeupEnd are set
     // it is equivalent for none
     uint32_t wakeupFlags = ISurfaceComposer::eEarlyWakeupStart | ISurfaceComposer::eEarlyWakeupEnd;
-    if ((mFlags & wakeupFlags) == wakeupFlags) {
-        mFlags &= ~(wakeupFlags);
+    if ((mState.mFlags & wakeupFlags) == wakeupFlags) {
+        mState.mFlags &= ~(wakeupFlags);
     }
-    sp<IBinder> applyToken = mApplyToken ? mApplyToken : getDefaultApplyToken();
+    if (!mState.mApplyToken) mState.mApplyToken = getDefaultApplyToken();
 
     sp<ISurfaceComposer> sf(ComposerService::getComposerService());
-    status_t binderStatus =
-            sf->setTransactionState(mFrameTimelineInfo, mComposerStates, mDisplayStates, mFlags,
-                                    applyToken, mInputWindowCommands, mDesiredPresentTime,
-                                    mIsAutoTimestamp, mUncacheBuffers, hasListenerCallbacks,
-                                    listenerCallbacks, mId, mMergedTransactionIds);
-    mId = generateId();
+    status_t binderStatus = sf->setTransactionState(std::move(mState));
+    mState.mId = generateId();
 
     // Clear the current states and flags
     clear();
@@ -1349,8 +1168,8 @@
         syncCallback->wait();
     }
 
-    if (mLogCallPoints) {
-        ALOG(LOG_DEBUG, LOG_SURFACE_CONTROL_REGISTRY, "Transaction %" PRIu64 " applied", mId);
+    if (mState.mLogCallPoints) {
+        ALOG(LOG_DEBUG, LOG_SURFACE_CONTROL_REGISTRY, "Transaction %" PRIu64 " applied", getId());
     }
 
     mStatus = NO_ERROR;
@@ -1385,7 +1204,7 @@
 }
 
 void SurfaceComposerClient::Transaction::enableDebugLogCallPoints() {
-    mLogCallPoints = true;
+    mState.mLogCallPoints = true;
 }
 
 // ---------------------------------------------------------------------------
@@ -1443,34 +1262,19 @@
 }
 
 void SurfaceComposerClient::Transaction::setAnimationTransaction() {
-    mFlags |= ISurfaceComposer::eAnimation;
+    mState.mFlags |= ISurfaceComposer::eAnimation;
 }
 
 void SurfaceComposerClient::Transaction::setEarlyWakeupStart() {
-    mFlags |= ISurfaceComposer::eEarlyWakeupStart;
+    mState.mFlags |= ISurfaceComposer::eEarlyWakeupStart;
 }
 
 void SurfaceComposerClient::Transaction::setEarlyWakeupEnd() {
-    mFlags |= ISurfaceComposer::eEarlyWakeupEnd;
+    mState.mFlags |= ISurfaceComposer::eEarlyWakeupEnd;
 }
 
 layer_state_t* SurfaceComposerClient::Transaction::getLayerState(const sp<SurfaceControl>& sc) {
-    auto handle = sc->getLayerStateHandle();
-    if (auto it = std::find_if(mComposerStates.begin(), mComposerStates.end(),
-                               [&handle](const auto& composerState) {
-                                   return composerState.state.surface == handle;
-                               });
-        it != mComposerStates.end()) {
-        return &it->state;
-    }
-
-    // we don't have it, add an initialized layer_state to our list
-    ComposerState s;
-    s.state.surface = handle;
-    s.state.layerId = sc->getLayerId();
-    mComposerStates.add(s);
-
-    return &mComposerStates.editItemAt(mComposerStates.size() - 1).state;
+    return mState.getLayerState(sc);
 }
 
 void SurfaceComposerClient::Transaction::registerSurfaceControlForCallback(
@@ -1846,8 +1650,8 @@
         setReleaseBufferCallback(bufferData.get(), callback);
     }
 
-    if (mIsAutoTimestamp) {
-        mDesiredPresentTime = systemTime();
+    if (mState.mIsAutoTimestamp) {
+        mState.mDesiredPresentTime = systemTime();
     }
     s->what |= layer_state_t::eBufferChanged;
     s->bufferData = std::move(bufferData);
@@ -1865,7 +1669,7 @@
                                        const std::vector<SurfaceControlStats>&) {},
                                     nullptr);
 
-    mMayContainBuffer = true;
+    mState.mMayContainBuffer = true;
     return *this;
 }
 
@@ -2041,8 +1845,8 @@
 
 SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setDesiredPresentTime(
         nsecs_t desiredPresentTime) {
-    mDesiredPresentTime = desiredPresentTime;
-    mIsAutoTimestamp = false;
+    mState.mDesiredPresentTime = desiredPresentTime;
+    mState.mIsAutoTimestamp = false;
     return *this;
 }
 
@@ -2131,14 +1935,14 @@
 
 SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setFocusedWindow(
         const FocusRequest& request) {
-    mInputWindowCommands.addFocusRequest(request);
+    mState.mInputWindowCommands.addFocusRequest(request);
     return *this;
 }
 
 SurfaceComposerClient::Transaction&
 SurfaceComposerClient::Transaction::addWindowInfosReportedListener(
         sp<gui::IWindowInfosReportedListener> windowInfosReportedListener) {
-    mInputWindowCommands.addWindowInfosReportedListener(windowInfosReportedListener);
+    mState.mInputWindowCommands.addWindowInfosReportedListener(windowInfosReportedListener);
     return *this;
 }
 
@@ -2302,7 +2106,7 @@
 
 SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setFrameTimelineInfo(
         const FrameTimelineInfo& frameTimelineInfo) {
-    mergeFrameTimelineInfo(mFrameTimelineInfo, frameTimelineInfo);
+    mState.mergeFrameTimelineInfo(frameTimelineInfo);
     return *this;
 }
 
@@ -2341,7 +2145,7 @@
 
 SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setApplyToken(
         const sp<IBinder>& applyToken) {
-    mApplyToken = applyToken;
+    mState.mApplyToken = applyToken;
     return *this;
 }
 
@@ -2469,17 +2273,7 @@
 // ---------------------------------------------------------------------------
 
 DisplayState& SurfaceComposerClient::Transaction::getDisplayState(const sp<IBinder>& token) {
-    if (auto it = std::find_if(mDisplayStates.begin(), mDisplayStates.end(),
-                               [token](const auto& display) { return display.token == token; });
-        it != mDisplayStates.end()) {
-        return *it;
-    }
-
-    // If display state doesn't exist, add a new one.
-    DisplayState s;
-    s.token = token;
-    mDisplayStates.add(s);
-    return mDisplayStates.editItemAt(mDisplayStates.size() - 1);
+    return mState.getDisplayState(token);
 }
 
 status_t SurfaceComposerClient::Transaction::setDisplaySurface(const sp<IBinder>& token,
@@ -2532,20 +2326,6 @@
     s.what |= DisplayState::eDisplaySizeChanged;
 }
 
-// copied from FrameTimelineInfo::merge()
-void SurfaceComposerClient::Transaction::mergeFrameTimelineInfo(FrameTimelineInfo& t,
-                                                                const FrameTimelineInfo& other) {
-    // When merging vsync Ids we take the oldest valid one
-    if (t.vsyncId != FrameTimelineInfo::INVALID_VSYNC_ID &&
-        other.vsyncId != FrameTimelineInfo::INVALID_VSYNC_ID) {
-        if (other.vsyncId > t.vsyncId) {
-            t = other;
-        }
-    } else if (t.vsyncId == FrameTimelineInfo::INVALID_VSYNC_ID) {
-        t = other;
-    }
-}
-
 SurfaceComposerClient::Transaction&
 SurfaceComposerClient::Transaction::setTrustedPresentationCallback(
         const sp<SurfaceControl>& sc, TrustedPresentationCallback cb,
diff --git a/libs/gui/include/gui/ISurfaceComposer.h b/libs/gui/include/gui/ISurfaceComposer.h
index 9a422fd..de553ae 100644
--- a/libs/gui/include/gui/ISurfaceComposer.h
+++ b/libs/gui/include/gui/ISurfaceComposer.h
@@ -65,6 +65,7 @@
 struct InputWindowCommands;
 class HdrCapabilities;
 class Rect;
+class TransactionState;
 
 using gui::FrameTimelineInfo;
 using gui::IDisplayEventConnection;
@@ -105,13 +106,7 @@
     };
 
     /* open/close transactions. requires ACCESS_SURFACE_FLINGER permission */
-    virtual status_t setTransactionState(
-            const FrameTimelineInfo& frameTimelineInfo, Vector<ComposerState>& state,
-            Vector<DisplayState>& displays, uint32_t flags, const sp<IBinder>& applyToken,
-            InputWindowCommands inputWindowCommands, int64_t desiredPresentTime,
-            bool isAutoTimestamp, const std::vector<client_cache_t>& uncacheBuffer,
-            bool hasListenerCallbacks, const std::vector<ListenerCallbacks>& listenerCallbacks,
-            uint64_t transactionId, const std::vector<uint64_t>& mergedTransactionIds) = 0;
+    virtual status_t setTransactionState(TransactionState&& state) = 0;
 };
 
 // ----------------------------------------------------------------------------
diff --git a/libs/gui/include/gui/SurfaceComposerClient.h b/libs/gui/include/gui/SurfaceComposerClient.h
index 4fda8de..15e3341 100644
--- a/libs/gui/include/gui/SurfaceComposerClient.h
+++ b/libs/gui/include/gui/SurfaceComposerClient.h
@@ -52,6 +52,7 @@
 #include <gui/ITransactionCompletedListener.h>
 #include <gui/LayerState.h>
 #include <gui/SurfaceControl.h>
+#include <gui/TransactionState.h>
 #include <gui/WindowInfosListenerReporter.h>
 #include <math/vec3.h>
 
@@ -447,56 +448,11 @@
         static sp<IBinder> sApplyToken;
         static std::mutex sApplyTokenMutex;
         void releaseBufferIfOverwriting(const layer_state_t& state);
-        static void mergeFrameTimelineInfo(FrameTimelineInfo& t, const FrameTimelineInfo& other);
         // Tracks registered callbacks
         sp<TransactionCompletedListener> mTransactionCompletedListener = nullptr;
-        // Prints debug logs when enabled.
-        bool mLogCallPoints = false;
 
-    protected:
-        Vector<ComposerState> mComposerStates;
-        Vector<DisplayState> mDisplayStates;
-        std::unordered_map<sp<ITransactionCompletedListener>, CallbackInfo, TCLHash>
-                mListenerCallbacks;
-        std::vector<client_cache_t> mUncacheBuffers;
+        TransactionState mState;
 
-        // We keep track of the last MAX_MERGE_HISTORY_LENGTH merged transaction ids.
-        // Ordered most recently merged to least recently merged.
-        static const size_t MAX_MERGE_HISTORY_LENGTH = 10u;
-        std::vector<uint64_t> mMergedTransactionIds;
-
-        uint64_t mId;
-        uint32_t mFlags = 0;
-
-        // Indicates that the Transaction may contain buffers that should be cached. The reason this
-        // is only a guess is that buffers can be removed before cache is called. This is only a
-        // hint that at some point a buffer was added to this transaction before apply was called.
-        bool mMayContainBuffer = false;
-
-        // mDesiredPresentTime is the time in nanoseconds that the client would like the transaction
-        // to be presented. When it is not possible to present at exactly that time, it will be
-        // presented after the time has passed.
-        //
-        // If the client didn't pass a desired presentation time, mDesiredPresentTime will be
-        // populated to the time setBuffer was called, and mIsAutoTimestamp will be set to true.
-        //
-        // Desired present times that are more than 1 second in the future may be ignored.
-        // When a desired present time has already passed, the transaction will be presented as soon
-        // as possible.
-        //
-        // Transactions from the same process are presented in the same order that they are applied.
-        // The desired present time does not affect this ordering.
-        int64_t mDesiredPresentTime = 0;
-        bool mIsAutoTimestamp = true;
-
-        // The vsync id provided by Choreographer.getVsyncId and the input event id
-        FrameTimelineInfo mFrameTimelineInfo;
-
-        // If not null, transactions will be queued up using this token otherwise a common token
-        // per process will be used.
-        sp<IBinder> mApplyToken = nullptr;
-
-        InputWindowCommands mInputWindowCommands;
         int mStatus = NO_ERROR;
 
         layer_state_t* getLayerState(const sp<SurfaceControl>& sc);
@@ -506,6 +462,11 @@
         void registerSurfaceControlForCallback(const sp<SurfaceControl>& sc);
         void setReleaseBufferCallback(BufferData*, ReleaseBufferCallback);
 
+    protected:
+        // Accessed in tests.
+        std::unordered_map<sp<ITransactionCompletedListener>, CallbackInfo, TCLHash>
+                mListenerCallbacks;
+
     public:
         Transaction();
         virtual ~Transaction() = default;
@@ -522,7 +483,7 @@
 
         // Returns the current id of the transaction.
         // The id is updated every time the transaction is applied.
-        uint64_t getId();
+        uint64_t getId() const;
 
         std::vector<uint64_t> getMergedTransactionIds();
 
diff --git a/libs/gui/tests/Surface_test.cpp b/libs/gui/tests/Surface_test.cpp
index e7690e2..9627b45 100644
--- a/libs/gui/tests/Surface_test.cpp
+++ b/libs/gui/tests/Surface_test.cpp
@@ -648,16 +648,7 @@
         mSupportsPresent = supportsPresent;
     }
 
-    status_t setTransactionState(
-            const FrameTimelineInfo& /*frameTimelineInfo*/, Vector<ComposerState>& /*state*/,
-            Vector<DisplayState>& /*displays*/, uint32_t /*flags*/,
-            const sp<IBinder>& /*applyToken*/, InputWindowCommands /*inputWindowCommands*/,
-            int64_t /*desiredPresentTime*/, bool /*isAutoTimestamp*/,
-            const std::vector<client_cache_t>& /*cachedBuffer*/, bool /*hasListenerCallbacks*/,
-            const std::vector<ListenerCallbacks>& /*listenerCallbacks*/, uint64_t /*transactionId*/,
-            const std::vector<uint64_t>& /*mergedTransactionIds*/) override {
-        return NO_ERROR;
-    }
+    status_t setTransactionState(TransactionState&&) override { return NO_ERROR; }
 
 protected:
     IBinder* onAsBinder() override { return nullptr; }