diff --git a/libs/gui/ISurfaceComposer.cpp b/libs/gui/ISurfaceComposer.cpp
index 8e7f814..9677125 100644
--- a/libs/gui/ISurfaceComposer.cpp
+++ b/libs/gui/ISurfaceComposer.cpp
@@ -29,8 +29,7 @@
 #include <gui/ISurfaceComposer.h>
 #include <gui/ISurfaceComposerClient.h>
 #include <gui/LayerDebugInfo.h>
-
-#include <private/gui/LayerState.h>
+#include <gui/LayerState.h>
 
 #include <system/graphics.h>
 
diff --git a/libs/gui/LayerState.cpp b/libs/gui/LayerState.cpp
index fcee73f..bfc6f28 100644
--- a/libs/gui/LayerState.cpp
+++ b/libs/gui/LayerState.cpp
@@ -18,7 +18,7 @@
 #include <binder/Parcel.h>
 #include <gui/ISurfaceComposerClient.h>
 #include <gui/IGraphicBufferProducer.h>
-#include <private/gui/LayerState.h>
+#include <gui/LayerState.h>
 
 namespace android {
 
diff --git a/libs/gui/SurfaceComposerClient.cpp b/libs/gui/SurfaceComposerClient.cpp
index c5a4389..40e319e 100644
--- a/libs/gui/SurfaceComposerClient.cpp
+++ b/libs/gui/SurfaceComposerClient.cpp
@@ -21,7 +21,6 @@
 
 #include <utils/Errors.h>
 #include <utils/Log.h>
-#include <utils/Singleton.h>
 #include <utils/SortedVector.h>
 #include <utils/String8.h>
 #include <utils/threads.h>
@@ -37,11 +36,11 @@
 #include <gui/IGraphicBufferProducer.h>
 #include <gui/ISurfaceComposer.h>
 #include <gui/ISurfaceComposerClient.h>
+#include <gui/LayerState.h>
 #include <gui/Surface.h>
 #include <gui/SurfaceComposerClient.h>
 
 #include <private/gui/ComposerService.h>
-#include <private/gui/LayerState.h>
 
 namespace android {
 // ---------------------------------------------------------------------------
@@ -97,208 +96,71 @@
 
 // ---------------------------------------------------------------------------
 
-static inline
-int compare_type(const ComposerState& lhs, const ComposerState& rhs) {
-    if (lhs.client < rhs.client)  return -1;
-    if (lhs.client > rhs.client)  return 1;
-    if (lhs.state.surface < rhs.state.surface)  return -1;
-    if (lhs.state.surface > rhs.state.surface)  return 1;
-    return 0;
+SurfaceComposerClient::Transaction::Transaction(const Transaction& other) :
+    mForceSynchronous(other.mForceSynchronous),
+    mTransactionNestCount(other.mTransactionNestCount),
+    mAnimation(other.mAnimation) {
+    mDisplayStates = other.mDisplayStates;
+    mComposerStates = other.mComposerStates;
 }
 
-static inline
-int compare_type(const DisplayState& lhs, const DisplayState& rhs) {
-    return compare_type(lhs.token, rhs.token);
+status_t SurfaceComposerClient::Transaction::apply(bool synchronous) {
+    if (mStatus != NO_ERROR) {
+        return mStatus;
+    }
+
+    sp<ISurfaceComposer> sf(ComposerService::getComposerService());
+
+    Vector<ComposerState> composerStates;
+    Vector<DisplayState> displayStates;
+    uint32_t flags = 0;
+
+    mForceSynchronous |= synchronous;
+
+    composerStates = mComposerStates;
+    mComposerStates.clear();
+
+    displayStates = mDisplayStates;
+    mDisplayStates.clear();
+
+    if (mForceSynchronous) {
+        flags |= ISurfaceComposer::eSynchronous;
+    }
+    if (mAnimation) {
+        flags |= ISurfaceComposer::eAnimation;
+    }
+
+    mForceSynchronous = false;
+    mAnimation = false;
+
+    sf->setTransactionState(composerStates, displayStates, flags);
+    mStatus = NO_ERROR;
+    return NO_ERROR;
 }
 
-class Composer : public Singleton<Composer>
-{
-    friend class Singleton<Composer>;
-
-    mutable Mutex               mLock;
-    SortedVector<ComposerState> mComposerStates;
-    SortedVector<DisplayState > mDisplayStates;
-    uint32_t                    mForceSynchronous;
-    uint32_t                    mTransactionNestCount;
-    bool                        mAnimation;
-
-    Composer() : Singleton<Composer>(),
-        mForceSynchronous(0), mTransactionNestCount(0),
-        mAnimation(false)
-    { }
-
-    void openGlobalTransactionImpl();
-    void closeGlobalTransactionImpl(bool synchronous);
-    void setAnimationTransactionImpl();
-    status_t enableVSyncInjectionsImpl(bool enable);
-    status_t injectVSyncImpl(nsecs_t when);
-
-    layer_state_t* getLayerStateLocked(
-            const sp<SurfaceComposerClient>& client, const sp<IBinder>& id);
-
-    DisplayState& getDisplayStateLocked(const sp<IBinder>& token);
-
-public:
-    sp<IBinder> createDisplay(const String8& displayName, bool secure);
-    void destroyDisplay(const sp<IBinder>& display);
-    sp<IBinder> getBuiltInDisplay(int32_t id);
-
-    status_t setPosition(const sp<SurfaceComposerClient>& client, const sp<IBinder>& id,
-            float x, float y);
-    status_t setSize(const sp<SurfaceComposerClient>& client, const sp<IBinder>& id,
-            uint32_t w, uint32_t h);
-    status_t setLayer(const sp<SurfaceComposerClient>& client, const sp<IBinder>& id,
-            int32_t z);
-    status_t setRelativeLayer(const sp<SurfaceComposerClient>& client, const sp<IBinder>& id,
-            const sp<IBinder>& relativeTo, int32_t z);
-    status_t setFlags(const sp<SurfaceComposerClient>& client, const sp<IBinder>& id,
-            uint32_t flags, uint32_t mask);
-    status_t setTransparentRegionHint(
-            const sp<SurfaceComposerClient>& client, const sp<IBinder>& id,
-            const Region& transparentRegion);
-    status_t setAlpha(const sp<SurfaceComposerClient>& client, const sp<IBinder>& id,
-            float alpha);
-    status_t setColor(const sp<SurfaceComposerClient>& client, const sp<IBinder>& id,
-            const half3& color);
-    status_t setMatrix(const sp<SurfaceComposerClient>& client, const sp<IBinder>& id,
-            float dsdx, float dtdx, float dtdy, float dsdy);
-    status_t setOrientation(int orientation);
-    status_t setCrop(const sp<SurfaceComposerClient>& client, const sp<IBinder>& id,
-            const Rect& crop);
-    status_t setFinalCrop(const sp<SurfaceComposerClient>& client,
-            const sp<IBinder>& id, const Rect& crop);
-    status_t setLayerStack(const sp<SurfaceComposerClient>& client,
-            const sp<IBinder>& id, uint32_t layerStack);
-    status_t deferTransactionUntil(const sp<SurfaceComposerClient>& client,
-            const sp<IBinder>& id, const sp<IBinder>& handle,
-            uint64_t frameNumber);
-    status_t deferTransactionUntil(const sp<SurfaceComposerClient>& client,
-            const sp<IBinder>& id, const sp<Surface>& barrierSurface,
-            uint64_t frameNumber);
-    status_t reparentChildren(const sp<SurfaceComposerClient>& client,
-            const sp<IBinder>& id,
-            const sp<IBinder>& newParentHandle);
-    status_t reparent(const sp<SurfaceComposerClient>& client,
-            const sp<IBinder>& id, const sp<IBinder>& newParentHandle);
-    status_t detachChildren(const sp<SurfaceComposerClient>& client,
-            const sp<IBinder>& id);
-    status_t setOverrideScalingMode(const sp<SurfaceComposerClient>& client,
-            const sp<IBinder>& id, int32_t overrideScalingMode);
-    status_t setGeometryAppliesWithResize(const sp<SurfaceComposerClient>& client,
-            const sp<IBinder>& id);
-
-    status_t setDisplaySurface(const sp<IBinder>& token,
-            sp<IGraphicBufferProducer> bufferProducer);
-    void setDisplayLayerStack(const sp<IBinder>& token, uint32_t layerStack);
-    void setDisplayProjection(const sp<IBinder>& token,
-            uint32_t orientation,
-            const Rect& layerStackRect,
-            const Rect& displayRect);
-    void setDisplaySize(const sp<IBinder>& token, uint32_t width, uint32_t height);
-
-    static void setAnimationTransaction() {
-        Composer::getInstance().setAnimationTransactionImpl();
-    }
-
-    static void openGlobalTransaction() {
-        Composer::getInstance().openGlobalTransactionImpl();
-    }
-
-    static void closeGlobalTransaction(bool synchronous) {
-        Composer::getInstance().closeGlobalTransactionImpl(synchronous);
-    }
-
-    static status_t enableVSyncInjections(bool enable) {
-        return Composer::getInstance().enableVSyncInjectionsImpl(enable);
-    }
-
-    static status_t injectVSync(nsecs_t when) {
-        return Composer::getInstance().injectVSyncImpl(when);
-    }
-};
-
-ANDROID_SINGLETON_STATIC_INSTANCE(Composer);
-
 // ---------------------------------------------------------------------------
 
-sp<IBinder> Composer::createDisplay(const String8& displayName, bool secure) {
+sp<IBinder> SurfaceComposerClient::createDisplay(const String8& displayName, bool secure) {
     return ComposerService::getComposerService()->createDisplay(displayName,
             secure);
 }
 
-void Composer::destroyDisplay(const sp<IBinder>& display) {
+void SurfaceComposerClient::destroyDisplay(const sp<IBinder>& display) {
     return ComposerService::getComposerService()->destroyDisplay(display);
 }
 
-sp<IBinder> Composer::getBuiltInDisplay(int32_t id) {
+sp<IBinder> SurfaceComposerClient::getBuiltInDisplay(int32_t id) {
     return ComposerService::getComposerService()->getBuiltInDisplay(id);
 }
 
-void Composer::openGlobalTransactionImpl() {
-    { // scope for the lock
-        Mutex::Autolock _l(mLock);
-        mTransactionNestCount += 1;
-    }
-}
-
-void Composer::closeGlobalTransactionImpl(bool synchronous) {
-    sp<ISurfaceComposer> sm(ComposerService::getComposerService());
-
-    Vector<ComposerState> transaction;
-    Vector<DisplayState> displayTransaction;
-    uint32_t flags = 0;
-
-    { // scope for the lock
-        Mutex::Autolock _l(mLock);
-        mForceSynchronous |= synchronous;
-        if (!mTransactionNestCount) {
-            ALOGW("At least one call to closeGlobalTransaction() was not matched by a prior "
-                    "call to openGlobalTransaction().");
-        } else if (--mTransactionNestCount) {
-            return;
-        }
-
-        transaction = mComposerStates;
-        mComposerStates.clear();
-
-        displayTransaction = mDisplayStates;
-        mDisplayStates.clear();
-
-        if (mForceSynchronous) {
-            flags |= ISurfaceComposer::eSynchronous;
-        }
-        if (mAnimation) {
-            flags |= ISurfaceComposer::eAnimation;
-        }
-
-        mForceSynchronous = false;
-        mAnimation = false;
-    }
-
-   sm->setTransactionState(transaction, displayTransaction, flags);
-}
-
-status_t Composer::enableVSyncInjectionsImpl(bool enable) {
-    sp<ISurfaceComposer> sm(ComposerService::getComposerService());
-    return sm->enableVSyncInjections(enable);
-}
-
-status_t Composer::injectVSyncImpl(nsecs_t when) {
-    sp<ISurfaceComposer> sm(ComposerService::getComposerService());
-    return sm->injectVSync(when);
-}
-
-void Composer::setAnimationTransactionImpl() {
-    Mutex::Autolock _l(mLock);
+void SurfaceComposerClient::Transaction::setAnimationTransaction() {
     mAnimation = true;
 }
 
-layer_state_t* Composer::getLayerStateLocked(
-        const sp<SurfaceComposerClient>& client, const sp<IBinder>& id) {
-
+layer_state_t* SurfaceComposerClient::Transaction::getLayerStateLocked(const sp<SurfaceControl>& sc) {
     ComposerState s;
-    s.client = client->mClient;
-    s.state.surface = id;
+    s.client = sc->getClient()->mClient;
+    s.state.surface = sc->getHandle();
 
     ssize_t index = mComposerStates.indexOf(s);
     if (index < 0) {
@@ -310,24 +172,36 @@
     return &(out[index].state);
 }
 
-status_t Composer::setPosition(const sp<SurfaceComposerClient>& client,
-        const sp<IBinder>& id, float x, float y) {
-    Mutex::Autolock _l(mLock);
-    layer_state_t* s = getLayerStateLocked(client, id);
-    if (!s)
-        return BAD_INDEX;
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setPosition(
+        const sp<SurfaceControl>& sc, float x, float y) {
+    layer_state_t* s = getLayerStateLocked(sc);
+    if (!s) {
+        mStatus = BAD_INDEX;
+        return *this;
+    }
     s->what |= layer_state_t::ePositionChanged;
     s->x = x;
     s->y = y;
-    return NO_ERROR;
+    return *this;
 }
 
-status_t Composer::setSize(const sp<SurfaceComposerClient>& client,
-        const sp<IBinder>& id, uint32_t w, uint32_t h) {
-    Mutex::Autolock _l(mLock);
-    layer_state_t* s = getLayerStateLocked(client, id);
-    if (!s)
-        return BAD_INDEX;
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::show(
+        const sp<SurfaceControl>& sc) {
+    return setFlags(sc, 0, layer_state_t::eLayerHidden);
+}
+
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::hide(
+        const sp<SurfaceControl>& sc) {
+    return setFlags(sc, layer_state_t::eLayerHidden, layer_state_t::eLayerHidden);
+}
+
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setSize(
+        const sp<SurfaceControl>& sc, uint32_t w, uint32_t h) {
+    layer_state_t* s = getLayerStateLocked(sc);
+    if (!s) {
+        mStatus = BAD_INDEX;
+        return *this;
+    }
     s->what |= layer_state_t::eSizeChanged;
     s->w = w;
     s->h = h;
@@ -335,41 +209,41 @@
     // Resizing a surface makes the transaction synchronous.
     mForceSynchronous = true;
 
-    return NO_ERROR;
+    return *this;
 }
 
-status_t Composer::setLayer(const sp<SurfaceComposerClient>& client,
-        const sp<IBinder>& id, int32_t z) {
-    Mutex::Autolock _l(mLock);
-    layer_state_t* s = getLayerStateLocked(client, id);
-    if (!s)
-        return BAD_INDEX;
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setLayer(
+        const sp<SurfaceControl>& sc, int32_t z) {
+    layer_state_t* s = getLayerStateLocked(sc);
+    if (!s) {
+        mStatus = BAD_INDEX;
+        return *this;
+    }
     s->what |= layer_state_t::eLayerChanged;
     s->z = z;
-    return NO_ERROR;
+    return *this;
 }
 
-status_t Composer::setRelativeLayer(const sp<SurfaceComposerClient>& client,
-        const sp<IBinder>& id, const sp<IBinder>& relativeTo,
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setRelativeLayer(const sp<SurfaceControl>& sc, const sp<IBinder>& relativeTo,
         int32_t z) {
-    Mutex::Autolock _l(mLock);
-    layer_state_t* s = getLayerStateLocked(client, id);
+    layer_state_t* s = getLayerStateLocked(sc);
     if (!s) {
-        return BAD_INDEX;
+        mStatus = BAD_INDEX;
     }
     s->what |= layer_state_t::eRelativeLayerChanged;
     s->relativeLayerHandle = relativeTo;
     s->z = z;
-    return NO_ERROR;
+    return *this;
 }
 
-status_t Composer::setFlags(const sp<SurfaceComposerClient>& client,
-        const sp<IBinder>& id, uint32_t flags,
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setFlags(
+        const sp<SurfaceControl>& sc, uint32_t flags,
         uint32_t mask) {
-    Mutex::Autolock _l(mLock);
-    layer_state_t* s = getLayerStateLocked(client, id);
-    if (!s)
-        return BAD_INDEX;
+    layer_state_t* s = getLayerStateLocked(sc);
+    if (!s) {
+        mStatus = BAD_INDEX;
+        return *this;
+    }
     if ((mask & layer_state_t::eLayerOpaque) ||
             (mask & layer_state_t::eLayerHidden) ||
             (mask & layer_state_t::eLayerSecure)) {
@@ -378,61 +252,54 @@
     s->flags &= ~mask;
     s->flags |= (flags & mask);
     s->mask |= mask;
-    return NO_ERROR;
+    return *this;
 }
 
-status_t Composer::setTransparentRegionHint(
-        const sp<SurfaceComposerClient>& client, const sp<IBinder>& id,
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setTransparentRegionHint(
+        const sp<SurfaceControl>& sc,
         const Region& transparentRegion) {
-    Mutex::Autolock _l(mLock);
-    layer_state_t* s = getLayerStateLocked(client, id);
-    if (!s)
-        return BAD_INDEX;
+    layer_state_t* s = getLayerStateLocked(sc);
+    if (!s) {
+        mStatus = BAD_INDEX;
+        return *this;
+    }
     s->what |= layer_state_t::eTransparentRegionChanged;
     s->transparentRegion = transparentRegion;
-    return NO_ERROR;
+    return *this;
 }
 
-status_t Composer::setAlpha(const sp<SurfaceComposerClient>& client,
-        const sp<IBinder>& id, float alpha) {
-    Mutex::Autolock _l(mLock);
-    layer_state_t* s = getLayerStateLocked(client, id);
-    if (!s)
-        return BAD_INDEX;
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setAlpha(
+        const sp<SurfaceControl>& sc, float alpha) {
+    layer_state_t* s = getLayerStateLocked(sc);
+    if (!s) {
+        mStatus = BAD_INDEX;
+        return *this;
+    }
     s->what |= layer_state_t::eAlphaChanged;
     s->alpha = alpha;
-    return NO_ERROR;
+    return *this;
 }
 
-status_t Composer::setColor(const sp<SurfaceComposerClient>& client,
-        const sp<IBinder>& id, const half3& color) {
-    Mutex::Autolock _l(mLock);
-    layer_state_t* s = getLayerStateLocked(client, id);
-    if (!s)
-        return BAD_INDEX;
-    s->what |= layer_state_t::eColorChanged;
-    s->color = color;
-    return NO_ERROR;
-}
-
-status_t Composer::setLayerStack(const sp<SurfaceComposerClient>& client,
-        const sp<IBinder>& id, uint32_t layerStack) {
-    Mutex::Autolock _l(mLock);
-    layer_state_t* s = getLayerStateLocked(client, id);
-    if (!s)
-        return BAD_INDEX;
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setLayerStack(
+        const sp<SurfaceControl>& sc, uint32_t layerStack) {
+    layer_state_t* s = getLayerStateLocked(sc);
+    if (!s) {
+        mStatus = BAD_INDEX;
+        return *this;
+    }
     s->what |= layer_state_t::eLayerStackChanged;
     s->layerStack = layerStack;
-    return NO_ERROR;
+    return *this;
 }
 
-status_t Composer::setMatrix(const sp<SurfaceComposerClient>& client,
-        const sp<IBinder>& id, float dsdx, float dtdx,
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setMatrix(
+        const sp<SurfaceControl>& sc, float dsdx, float dtdx,
         float dtdy, float dsdy) {
-    Mutex::Autolock _l(mLock);
-    layer_state_t* s = getLayerStateLocked(client, id);
-    if (!s)
-        return BAD_INDEX;
+    layer_state_t* s = getLayerStateLocked(sc);
+    if (!s) {
+        mStatus = BAD_INDEX;
+        return *this;
+    }
     s->what |= layer_state_t::eMatrixChanged;
     layer_state_t::matrix22_t matrix;
     matrix.dsdx = dsdx;
@@ -440,106 +307,115 @@
     matrix.dsdy = dsdy;
     matrix.dtdy = dtdy;
     s->matrix = matrix;
-    return NO_ERROR;
+    return *this;
 }
 
-status_t Composer::setCrop(const sp<SurfaceComposerClient>& client,
-        const sp<IBinder>& id, const Rect& crop) {
-    Mutex::Autolock _l(mLock);
-    layer_state_t* s = getLayerStateLocked(client, id);
-    if (!s)
-        return BAD_INDEX;
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setCrop(
+        const sp<SurfaceControl>& sc, const Rect& crop) {
+    layer_state_t* s = getLayerStateLocked(sc);
+    if (!s) {
+        mStatus = BAD_INDEX;
+        return *this;
+    }
     s->what |= layer_state_t::eCropChanged;
     s->crop = crop;
-    return NO_ERROR;
+    return *this;
 }
 
-status_t Composer::setFinalCrop(const sp<SurfaceComposerClient>& client,
-        const sp<IBinder>& id, const Rect& crop) {
-    Mutex::Autolock _l(mLock);
-    layer_state_t* s = getLayerStateLocked(client, id);
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setFinalCrop(const sp<SurfaceControl>& sc, const Rect& crop) {
+    layer_state_t* s = getLayerStateLocked(sc);
     if (!s) {
-        return BAD_INDEX;
+        mStatus = BAD_INDEX;
+        return *this;
     }
     s->what |= layer_state_t::eFinalCropChanged;
     s->finalCrop = crop;
-    return NO_ERROR;
+    return *this;
 }
 
-status_t Composer::deferTransactionUntil(
-        const sp<SurfaceComposerClient>& client, const sp<IBinder>& id,
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::deferTransactionUntil(
+        const sp<SurfaceControl>& sc,
         const sp<IBinder>& handle, uint64_t frameNumber) {
-    Mutex::Autolock lock(mLock);
-    layer_state_t* s = getLayerStateLocked(client, id);
+    layer_state_t* s = getLayerStateLocked(sc);
     if (!s) {
-        return BAD_INDEX;
+        mStatus = BAD_INDEX;
+        return *this;
     }
     s->what |= layer_state_t::eDeferTransaction;
     s->barrierHandle = handle;
     s->frameNumber = frameNumber;
-    return NO_ERROR;
+    return *this;
 }
 
-status_t Composer::deferTransactionUntil(
-        const sp<SurfaceComposerClient>& client, const sp<IBinder>& id,
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::deferTransactionUntil(
+        const sp<SurfaceControl>& sc,
         const sp<Surface>& barrierSurface, uint64_t frameNumber) {
-    Mutex::Autolock lock(mLock);
-    layer_state_t* s = getLayerStateLocked(client, id);
+    layer_state_t* s = getLayerStateLocked(sc);
     if (!s) {
-        return BAD_INDEX;
+        mStatus = BAD_INDEX;
+        return *this;
     }
     s->what |= layer_state_t::eDeferTransaction;
     s->barrierGbp = barrierSurface->getIGraphicBufferProducer();
     s->frameNumber = frameNumber;
-    return NO_ERROR;
+    return *this;
 }
 
-status_t Composer::reparentChildren(
-        const sp<SurfaceComposerClient>& client,
-        const sp<IBinder>& id,
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::reparentChildren(
+        const sp<SurfaceControl>& sc,
         const sp<IBinder>& newParentHandle) {
-    Mutex::Autolock lock(mLock);
-    layer_state_t* s = getLayerStateLocked(client, id);
+    layer_state_t* s = getLayerStateLocked(sc);
     if (!s) {
-        return BAD_INDEX;
+        mStatus = BAD_INDEX;
+        return *this;
     }
     s->what |= layer_state_t::eReparentChildren;
     s->reparentHandle = newParentHandle;
-    return NO_ERROR;
+    return *this;
 }
 
-status_t Composer::reparent(const sp<SurfaceComposerClient>& client,
-        const sp<IBinder>& id,
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::reparent(
+        const sp<SurfaceControl>& sc,
         const sp<IBinder>& newParentHandle) {
-    Mutex::Autolock lock(mLock);
-    layer_state_t* s = getLayerStateLocked(client, id);
+    layer_state_t* s = getLayerStateLocked(sc);
     if (!s) {
-        return BAD_INDEX;
+        mStatus = BAD_INDEX;
+        return *this;
     }
     s->what |= layer_state_t::eReparent;
     s->parentHandleForChild = newParentHandle;
-    return NO_ERROR;
+    return *this;
 }
 
-status_t Composer::detachChildren(
-        const sp<SurfaceComposerClient>& client,
-        const sp<IBinder>& id) {
-    Mutex::Autolock lock(mLock);
-    layer_state_t* s = getLayerStateLocked(client, id);
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setColor(
+        const sp<SurfaceControl>& sc,
+        const half3& color) {
+    layer_state_t* s = getLayerStateLocked(sc);
     if (!s) {
-        return BAD_INDEX;
+        mStatus = BAD_INDEX;
+        return *this;
+    }
+    s->what |= layer_state_t::eColorChanged;
+    s->color = color;
+    return *this;
+}
+
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::detachChildren(
+        const sp<SurfaceControl>& sc) {
+    layer_state_t* s = getLayerStateLocked(sc);
+    if (!s) {
+        mStatus = BAD_INDEX;
     }
     s->what |= layer_state_t::eDetachChildren;
-    return NO_ERROR;
+    return *this;
 }
 
-status_t Composer::setOverrideScalingMode(
-        const sp<SurfaceComposerClient>& client,
-        const sp<IBinder>& id, int32_t overrideScalingMode) {
-    Mutex::Autolock lock(mLock);
-    layer_state_t* s = getLayerStateLocked(client, id);
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setOverrideScalingMode(
+        const sp<SurfaceControl>& sc, int32_t overrideScalingMode) {
+    layer_state_t* s = getLayerStateLocked(sc);
     if (!s) {
-        return BAD_INDEX;
+        mStatus = BAD_INDEX;
+        return *this;
     }
 
     switch (overrideScalingMode) {
@@ -552,29 +428,29 @@
         default:
             ALOGE("unknown scaling mode: %d",
                     overrideScalingMode);
-            return BAD_VALUE;
+            mStatus = BAD_VALUE;
+            return *this;
     }
 
     s->what |= layer_state_t::eOverrideScalingModeChanged;
     s->overrideScalingMode = overrideScalingMode;
-    return NO_ERROR;
+    return *this;
 }
 
-status_t Composer::setGeometryAppliesWithResize(
-        const sp<SurfaceComposerClient>& client,
-        const sp<IBinder>& id) {
-    Mutex::Autolock lock(mLock);
-    layer_state_t* s = getLayerStateLocked(client, id);
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setGeometryAppliesWithResize(
+        const sp<SurfaceControl>& sc) {
+    layer_state_t* s = getLayerStateLocked(sc);
     if (!s) {
-        return BAD_INDEX;
+        mStatus = BAD_INDEX;
+        return *this;
     }
     s->what |= layer_state_t::eGeometryAppliesWithResize;
-    return NO_ERROR;
+    return *this;
 }
 
 // ---------------------------------------------------------------------------
 
-DisplayState& Composer::getDisplayStateLocked(const sp<IBinder>& token) {
+DisplayState& SurfaceComposerClient::Transaction::getDisplayStateLocked(const sp<IBinder>& token) {
     DisplayState s;
     s.token = token;
     ssize_t index = mDisplayStates.indexOf(s);
@@ -586,8 +462,8 @@
     return mDisplayStates.editItemAt(static_cast<size_t>(index));
 }
 
-status_t Composer::setDisplaySurface(const sp<IBinder>& token,
-        sp<IGraphicBufferProducer> bufferProducer) {
+status_t SurfaceComposerClient::Transaction::setDisplaySurface(const sp<IBinder>& token,
+        const sp<IGraphicBufferProducer>& bufferProducer) {
     if (bufferProducer.get() != nullptr) {
         // Make sure that composition can never be stalled by a virtual display
         // consumer that isn't processing buffers fast enough.
@@ -599,26 +475,23 @@
             return err;
         }
     }
-    Mutex::Autolock _l(mLock);
     DisplayState& s(getDisplayStateLocked(token));
     s.surface = bufferProducer;
     s.what |= DisplayState::eSurfaceChanged;
     return NO_ERROR;
 }
 
-void Composer::setDisplayLayerStack(const sp<IBinder>& token,
+void SurfaceComposerClient::Transaction::setDisplayLayerStack(const sp<IBinder>& token,
         uint32_t layerStack) {
-    Mutex::Autolock _l(mLock);
     DisplayState& s(getDisplayStateLocked(token));
     s.layerStack = layerStack;
     s.what |= DisplayState::eLayerStackChanged;
 }
 
-void Composer::setDisplayProjection(const sp<IBinder>& token,
+void SurfaceComposerClient::Transaction::setDisplayProjection(const sp<IBinder>& token,
         uint32_t orientation,
         const Rect& layerStackRect,
         const Rect& displayRect) {
-    Mutex::Autolock _l(mLock);
     DisplayState& s(getDisplayStateLocked(token));
     s.orientation = orientation;
     s.viewport = layerStackRect;
@@ -627,8 +500,7 @@
     mForceSynchronous = true; // TODO: do we actually still need this?
 }
 
-void Composer::setDisplaySize(const sp<IBinder>& token, uint32_t width, uint32_t height) {
-    Mutex::Autolock _l(mLock);
+void SurfaceComposerClient::Transaction::setDisplaySize(const sp<IBinder>& token, uint32_t width, uint32_t height) {
     DisplayState& s(getDisplayStateLocked(token));
     s.width = width;
     s.height = height;
@@ -638,22 +510,22 @@
 // ---------------------------------------------------------------------------
 
 SurfaceComposerClient::SurfaceComposerClient()
-    : mStatus(NO_INIT), mComposer(Composer::getInstance())
+    : mStatus(NO_INIT)
 {
 }
 
 SurfaceComposerClient::SurfaceComposerClient(const sp<IGraphicBufferProducer>& root)
-    : mStatus(NO_INIT), mComposer(Composer::getInstance()), mParent(root)
+    : mStatus(NO_INIT), mParent(root)
 {
 }
 
 void SurfaceComposerClient::onFirstRef() {
-    sp<ISurfaceComposer> sm(ComposerService::getComposerService());
-    if (sm != 0) {
+    sp<ISurfaceComposer> sf(ComposerService::getComposerService());
+    if (sf != 0) {
         auto rootProducer = mParent.promote();
         sp<ISurfaceComposerClient> conn;
-        conn = (rootProducer != nullptr) ? sm->createScopedConnection(rootProducer) :
-                sm->createConnection();
+        conn = (rootProducer != nullptr) ? sf->createScopedConnection(rootProducer) :
+                sf->createConnection();
         if (conn != 0) {
             mClient = conn;
             mStatus = NO_ERROR;
@@ -676,8 +548,8 @@
 status_t SurfaceComposerClient::linkToComposerDeath(
         const sp<IBinder::DeathRecipient>& recipient,
         void* cookie, uint32_t flags) {
-    sp<ISurfaceComposer> sm(ComposerService::getComposerService());
-    return IInterface::asBinder(sm)->linkToDeath(recipient, cookie, flags);
+    sp<ISurfaceComposer> sf(ComposerService::getComposerService());
+    return IInterface::asBinder(sf)->linkToDeath(recipient, cookie, flags);
 }
 
 void SurfaceComposerClient::dispose() {
@@ -720,19 +592,6 @@
     return sur;
 }
 
-sp<IBinder> SurfaceComposerClient::createDisplay(const String8& displayName,
-        bool secure) {
-    return Composer::getInstance().createDisplay(displayName, secure);
-}
-
-void SurfaceComposerClient::destroyDisplay(const sp<IBinder>& display) {
-    Composer::getInstance().destroyDisplay(display);
-}
-
-sp<IBinder> SurfaceComposerClient::getBuiltInDisplay(int32_t id) {
-    return Composer::getInstance().getBuiltInDisplay(id);
-}
-
 status_t SurfaceComposerClient::destroySurface(const sp<IBinder>& sid) {
     if (mStatus != NO_ERROR)
         return mStatus;
@@ -755,161 +614,18 @@
     return mClient->getLayerFrameStats(token, outStats);
 }
 
-inline Composer& SurfaceComposerClient::getComposer() {
-    return mComposer;
-}
-
 // ----------------------------------------------------------------------------
 
-void SurfaceComposerClient::openGlobalTransaction() {
-    Composer::openGlobalTransaction();
-}
-
-void SurfaceComposerClient::closeGlobalTransaction(bool synchronous) {
-    Composer::closeGlobalTransaction(synchronous);
-}
-
-void SurfaceComposerClient::setAnimationTransaction() {
-    Composer::setAnimationTransaction();
-}
-
 status_t SurfaceComposerClient::enableVSyncInjections(bool enable) {
-    return Composer::enableVSyncInjections(enable);
+    sp<ISurfaceComposer> sf(ComposerService::getComposerService());
+    return sf->enableVSyncInjections(enable);
 }
 
 status_t SurfaceComposerClient::injectVSync(nsecs_t when) {
-    return Composer::injectVSync(when);
+    sp<ISurfaceComposer> sf(ComposerService::getComposerService());
+    return sf->injectVSync(when);
 }
 
-// ----------------------------------------------------------------------------
-
-status_t SurfaceComposerClient::setCrop(const sp<IBinder>& id, const Rect& crop) {
-    return getComposer().setCrop(this, id, crop);
-}
-
-status_t SurfaceComposerClient::setFinalCrop(const sp<IBinder>& id,
-        const Rect& crop) {
-    return getComposer().setFinalCrop(this, id, crop);
-}
-
-status_t SurfaceComposerClient::setPosition(const sp<IBinder>& id, float x, float y) {
-    return getComposer().setPosition(this, id, x, y);
-}
-
-status_t SurfaceComposerClient::setSize(const sp<IBinder>& id, uint32_t w, uint32_t h) {
-    return getComposer().setSize(this, id, w, h);
-}
-
-status_t SurfaceComposerClient::setLayer(const sp<IBinder>& id, int32_t z) {
-    return getComposer().setLayer(this, id, z);
-}
-
-status_t SurfaceComposerClient::setRelativeLayer(const sp<IBinder>& id,
-        const sp<IBinder>& relativeTo, int32_t z) {
-    return getComposer().setRelativeLayer(this, id, relativeTo, z);
-}
-
-status_t SurfaceComposerClient::hide(const sp<IBinder>& id) {
-    return getComposer().setFlags(this, id,
-            layer_state_t::eLayerHidden,
-            layer_state_t::eLayerHidden);
-}
-
-status_t SurfaceComposerClient::show(const sp<IBinder>& id) {
-    return getComposer().setFlags(this, id,
-            0,
-            layer_state_t::eLayerHidden);
-}
-
-status_t SurfaceComposerClient::setFlags(const sp<IBinder>& id, uint32_t flags,
-        uint32_t mask) {
-    return getComposer().setFlags(this, id, flags, mask);
-}
-
-status_t SurfaceComposerClient::setTransparentRegionHint(const sp<IBinder>& id,
-        const Region& transparentRegion) {
-    return getComposer().setTransparentRegionHint(this, id, transparentRegion);
-}
-
-status_t SurfaceComposerClient::setAlpha(const sp<IBinder>& id, float alpha) {
-    return getComposer().setAlpha(this, id, alpha);
-}
-
-status_t SurfaceComposerClient::setColor(const sp<IBinder>& id, const half3& color) {
-    return getComposer().setColor(this, id, color);
-}
-
-status_t SurfaceComposerClient::setLayerStack(const sp<IBinder>& id, uint32_t layerStack) {
-    return getComposer().setLayerStack(this, id, layerStack);
-}
-
-status_t SurfaceComposerClient::setMatrix(const sp<IBinder>& id, float dsdx, float dtdx,
-        float dtdy, float dsdy) {
-    return getComposer().setMatrix(this, id, dsdx, dtdx, dtdy, dsdy);
-}
-
-status_t SurfaceComposerClient::deferTransactionUntil(const sp<IBinder>& id,
-        const sp<IBinder>& handle, uint64_t frameNumber) {
-    return getComposer().deferTransactionUntil(this, id, handle, frameNumber);
-}
-
-status_t SurfaceComposerClient::deferTransactionUntil(const sp<IBinder>& id,
-        const sp<Surface>& barrierSurface, uint64_t frameNumber) {
-    return getComposer().deferTransactionUntil(this, id, barrierSurface, frameNumber);
-}
-
-status_t SurfaceComposerClient::reparentChildren(const sp<IBinder>& id,
-        const sp<IBinder>& newParentHandle) {
-    return getComposer().reparentChildren(this, id, newParentHandle);
-}
-
-status_t SurfaceComposerClient::reparent(const sp<IBinder>& id,
-        const sp<IBinder>& newParentHandle) {
-    return getComposer().reparent(this, id, newParentHandle);
-}
-
-status_t SurfaceComposerClient::detachChildren(const sp<IBinder>& id) {
-    return getComposer().detachChildren(this, id);
-}
-
-status_t SurfaceComposerClient::setOverrideScalingMode(
-        const sp<IBinder>& id, int32_t overrideScalingMode) {
-    return getComposer().setOverrideScalingMode(
-            this, id, overrideScalingMode);
-}
-
-status_t SurfaceComposerClient::setGeometryAppliesWithResize(
-        const sp<IBinder>& id) {
-    return getComposer().setGeometryAppliesWithResize(this, id);
-}
-
-// ----------------------------------------------------------------------------
-
-status_t SurfaceComposerClient::setDisplaySurface(const sp<IBinder>& token,
-        sp<IGraphicBufferProducer> bufferProducer) {
-    return Composer::getInstance().setDisplaySurface(token, bufferProducer);
-}
-
-void SurfaceComposerClient::setDisplayLayerStack(const sp<IBinder>& token,
-        uint32_t layerStack) {
-    Composer::getInstance().setDisplayLayerStack(token, layerStack);
-}
-
-void SurfaceComposerClient::setDisplayProjection(const sp<IBinder>& token,
-        uint32_t orientation,
-        const Rect& layerStackRect,
-        const Rect& displayRect) {
-    Composer::getInstance().setDisplayProjection(token, orientation,
-            layerStackRect, displayRect);
-}
-
-void SurfaceComposerClient::setDisplaySize(const sp<IBinder>& token,
-        uint32_t width, uint32_t height) {
-    Composer::getInstance().setDisplaySize(token, width, height);
-}
-
-// ----------------------------------------------------------------------------
-
 status_t SurfaceComposerClient::getDisplayConfigs(
         const sp<IBinder>& display, Vector<DisplayInfo>* configs)
 {
diff --git a/libs/gui/SurfaceControl.cpp b/libs/gui/SurfaceControl.cpp
index 9e1d7b6..f6a2b8f 100644
--- a/libs/gui/SurfaceControl.cpp
+++ b/libs/gui/SurfaceControl.cpp
@@ -97,123 +97,6 @@
     return lhs->mHandle == rhs->mHandle;
 }
 
-status_t SurfaceControl::setLayerStack(uint32_t layerStack) {
-    status_t err = validate();
-    if (err < 0) return err;
-    return mClient->setLayerStack(mHandle, layerStack);
-}
-
-status_t SurfaceControl::setLayer(int32_t layer) {
-    status_t err = validate();
-    if (err < 0) return err;
-    return mClient->setLayer(mHandle, layer);
-}
-
-status_t SurfaceControl::setRelativeLayer(const sp<IBinder>& relativeTo, int32_t layer) {
-    status_t err = validate();
-    if (err < 0) return err;
-    return mClient->setRelativeLayer(mHandle, relativeTo, layer);
-}
-
-status_t SurfaceControl::setPosition(float x, float y) {
-    status_t err = validate();
-    if (err < 0) return err;
-    return mClient->setPosition(mHandle, x, y);
-}
-status_t SurfaceControl::setGeometryAppliesWithResize() {
-    status_t err = validate();
-    if (err < 0) return err;
-    return mClient->setGeometryAppliesWithResize(mHandle);
-}
-status_t SurfaceControl::setSize(uint32_t w, uint32_t h) {
-    status_t err = validate();
-    if (err < 0) return err;
-    return mClient->setSize(mHandle, w, h);
-}
-status_t SurfaceControl::hide() {
-    status_t err = validate();
-    if (err < 0) return err;
-    return mClient->hide(mHandle);
-}
-status_t SurfaceControl::show() {
-    status_t err = validate();
-    if (err < 0) return err;
-    return mClient->show(mHandle);
-}
-status_t SurfaceControl::setFlags(uint32_t flags, uint32_t mask) {
-    status_t err = validate();
-    if (err < 0) return err;
-    return mClient->setFlags(mHandle, flags, mask);
-}
-status_t SurfaceControl::setTransparentRegionHint(const Region& transparent) {
-    status_t err = validate();
-    if (err < 0) return err;
-    return mClient->setTransparentRegionHint(mHandle, transparent);
-}
-status_t SurfaceControl::setAlpha(float alpha) {
-    status_t err = validate();
-    if (err < 0) return err;
-    return mClient->setAlpha(mHandle, alpha);
-}
-status_t SurfaceControl::setColor(const half3& color) {
-    status_t err = validate();
-    if (err < 0) return err;
-    return mClient->setColor(mHandle, color);
-}
-status_t SurfaceControl::setMatrix(float dsdx, float dtdx, float dtdy, float dsdy) {
-    status_t err = validate();
-    if (err < 0) return err;
-    return mClient->setMatrix(mHandle, dsdx, dtdx, dtdy, dsdy);
-}
-status_t SurfaceControl::setCrop(const Rect& crop) {
-    status_t err = validate();
-    if (err < 0) return err;
-    return mClient->setCrop(mHandle, crop);
-}
-status_t SurfaceControl::setFinalCrop(const Rect& crop) {
-    status_t err = validate();
-    if (err < 0) return err;
-    return mClient->setFinalCrop(mHandle, crop);
-}
-
-status_t SurfaceControl::deferTransactionUntil(const sp<IBinder>& handle,
-        uint64_t frameNumber) {
-    status_t err = validate();
-    if (err < 0) return err;
-    return mClient->deferTransactionUntil(mHandle, handle, frameNumber);
-}
-
-status_t SurfaceControl::deferTransactionUntil(const sp<Surface>& handle,
-        uint64_t frameNumber) {
-    status_t err = validate();
-    if (err < 0) return err;
-    return mClient->deferTransactionUntil(mHandle, handle, frameNumber);
-}
-
-status_t SurfaceControl::reparentChildren(const sp<IBinder>& newParentHandle) {
-    status_t err = validate();
-    if (err < 0) return err;
-    return mClient->reparentChildren(mHandle, newParentHandle);
-}
-
-status_t SurfaceControl::reparent(const sp<IBinder>& newParentHandle) {
-    status_t err = validate();
-    if (err < 0) return err;
-    return mClient->reparent(mHandle, newParentHandle);
-}
-
-status_t SurfaceControl::detachChildren() {
-    status_t err = validate();
-    if (err < 0) return err;
-    return mClient->detachChildren(mHandle);
-}
-
-status_t SurfaceControl::setOverrideScalingMode(int32_t overrideScalingMode) {
-    status_t err = validate();
-    if (err < 0) return err;
-    return mClient->setOverrideScalingMode(mHandle, overrideScalingMode);
-}
-
 status_t SurfaceControl::clearLayerFrameStats() const {
     status_t err = validate();
     if (err < 0) return err;
@@ -278,5 +161,10 @@
     return mHandle;
 }
 
+sp<SurfaceComposerClient> SurfaceControl::getClient() const
+{
+    return mClient;
+}
+
 // ----------------------------------------------------------------------------
 }; // namespace android
diff --git a/libs/gui/include/private/gui/LayerState.h b/libs/gui/include/gui/LayerState.h
similarity index 91%
rename from libs/gui/include/private/gui/LayerState.h
rename to libs/gui/include/gui/LayerState.h
index bd42634..ae6965a 100644
--- a/libs/gui/include/private/gui/LayerState.h
+++ b/libs/gui/include/gui/LayerState.h
@@ -157,6 +157,20 @@
     status_t read(const Parcel& input);
 };
 
+static inline
+int compare_type(const ComposerState& lhs, const ComposerState& rhs) {
+    if (lhs.client < rhs.client) return -1;
+    if (lhs.client > rhs.client) return 1;
+    if (lhs.state.surface < rhs.state.surface)  return -1;
+    if (lhs.state.surface > rhs.state.surface)  return 1;
+    return 0;
+}
+
+static inline
+int compare_type(const DisplayState& lhs, const DisplayState& rhs) {
+    return compare_type(lhs.token, rhs.token);
+}
+
 }; // namespace android
 
 #endif // ANDROID_SF_LAYER_STATE_H
diff --git a/libs/gui/include/gui/SurfaceComposerClient.h b/libs/gui/include/gui/SurfaceComposerClient.h
index 1718143..00d5936 100644
--- a/libs/gui/include/gui/SurfaceComposerClient.h
+++ b/libs/gui/include/gui/SurfaceComposerClient.h
@@ -33,13 +33,13 @@
 #include <gui/CpuConsumer.h>
 #include <gui/SurfaceControl.h>
 #include <math/vec3.h>
+#include <gui/LayerState.h>
 
 namespace android {
 
 // ---------------------------------------------------------------------------
 
 struct DisplayInfo;
-class Composer;
 class HdrCapabilities;
 class ISurfaceComposerClient;
 class IGraphicBufferProducer;
@@ -122,93 +122,158 @@
     //! Possible values for id are eDisplayIdMain and eDisplayIdHdmi.
     static sp<IBinder> getBuiltInDisplay(int32_t id);
 
-    // ------------------------------------------------------------------------
-    // Composer parameters
-    // All composer parameters must be changed within a transaction
-    // several surfaces can be updated in one transaction, all changes are
-    // committed at once when the transaction is closed.
-    // closeGlobalTransaction() requires an IPC with the server.
-
-    //! Open a composer transaction on all active SurfaceComposerClients.
-    static void openGlobalTransaction();
-
-    //! Close a composer transaction on all active SurfaceComposerClients.
-    static void closeGlobalTransaction(bool synchronous = false);
-
     static status_t enableVSyncInjections(bool enable);
 
     static status_t injectVSync(nsecs_t when);
 
-    //! Flag the currently open transaction as an animation transaction.
-    static void setAnimationTransaction();
+    class Transaction {
+        SortedVector<ComposerState> mComposerStates;
+        SortedVector<DisplayState > mDisplayStates;
+        uint32_t                    mForceSynchronous = 0;
+        uint32_t                    mTransactionNestCount = 0;
+        bool                        mAnimation = false;
 
-    status_t    hide(const sp<IBinder>& id);
-    status_t    show(const sp<IBinder>& id);
-    status_t    setFlags(const sp<IBinder>& id, uint32_t flags, uint32_t mask);
-    status_t    setTransparentRegionHint(const sp<IBinder>& id, const Region& transparent);
-    status_t    setLayer(const sp<IBinder>& id, int32_t layer);
-    status_t    setRelativeLayer(const sp<IBinder>& id,
-            const sp<IBinder>& relativeTo, int32_t layer);
-    status_t    setAlpha(const sp<IBinder>& id, float alpha=1.0f);
-    status_t    setColor(const sp<IBinder>& id, const half3& color);
-    status_t    setMatrix(const sp<IBinder>& id, float dsdx, float dtdx, float dtdy, float dsdy);
-    status_t    setPosition(const sp<IBinder>& id, float x, float y);
-    status_t    setSize(const sp<IBinder>& id, uint32_t w, uint32_t h);
-    status_t    setCrop(const sp<IBinder>& id, const Rect& crop);
-    status_t    setFinalCrop(const sp<IBinder>& id, const Rect& crop);
-    status_t    setLayerStack(const sp<IBinder>& id, uint32_t layerStack);
-    status_t    deferTransactionUntil(const sp<IBinder>& id,
-            const sp<IBinder>& handle, uint64_t frameNumber);
-    status_t    deferTransactionUntil(const sp<IBinder>& id,
-            const sp<Surface>& handle, uint64_t frameNumber);
-    status_t    reparentChildren(const sp<IBinder>& id,
-            const sp<IBinder>& newParentHandle);
-    status_t    reparent(const sp<IBinder>& id, const sp<IBinder>& newParentHandle);
-    status_t    detachChildren(const sp<IBinder>& id);
-    status_t    setOverrideScalingMode(const sp<IBinder>& id,
-            int32_t overrideScalingMode);
-    status_t    setGeometryAppliesWithResize(const sp<IBinder>& id);
+        int mStatus = NO_ERROR;
+
+        layer_state_t* getLayerStateLocked(const sp<SurfaceControl>& sc);
+        DisplayState& getDisplayStateLocked(const sp<IBinder>& token);
+
+    public:
+        Transaction() = default;
+        virtual ~Transaction() = default;
+        Transaction(Transaction const& other);
+
+        status_t apply(bool synchronous = false);
+
+        Transaction& show(const sp<SurfaceControl>& sc);
+        Transaction& hide(const sp<SurfaceControl>& sc);
+        Transaction& setPosition(const sp<SurfaceControl>& sc,
+                float x, float y);
+        Transaction& setSize(const sp<SurfaceControl>& sc,
+                uint32_t w, uint32_t h);
+        Transaction& setLayer(const sp<SurfaceControl>& sc,
+                int32_t z);
+
+        // Sets a Z order relative to the Surface specified by "relativeTo" but
+        // without becoming a full child of the relative. Z-ordering works exactly
+        // as if it were a child however.
+        //
+        // As a nod to sanity, only non-child surfaces may have a relative Z-order.
+        //
+        // This overrides any previous call and is overriden by any future calls
+        // to setLayer.
+        //
+        // If the relative is removed, the Surface will have no layer and be
+        // invisible, until the next time set(Relative)Layer is called.
+        Transaction& setRelativeLayer(const sp<SurfaceControl>& sc,
+                const sp<IBinder>& relativeTo, int32_t z);
+        Transaction& setFlags(const sp<SurfaceControl>& sc,
+                uint32_t flags, uint32_t mask);
+        Transaction& setTransparentRegionHint(const sp<SurfaceControl>& sc,
+                const Region& transparentRegion);
+        Transaction& setAlpha(const sp<SurfaceControl>& sc,
+                float alpha);
+        Transaction& setMatrix(const sp<SurfaceControl>& sc,
+                float dsdx, float dtdx, float dtdy, float dsdy);
+        Transaction& setOrientation(const sp<SurfaceControl>& sc,
+                const Rect& crop);
+        Transaction& setCrop(const sp<SurfaceControl>& sc, const Rect& crop);
+        Transaction& setFinalCrop(const sp<SurfaceControl>& sc, const Rect& crop);
+        Transaction& setLayerStack(const sp<SurfaceControl>& sc, uint32_t layerStack);
+        // Defers applying any changes made in this transaction until the Layer
+        // identified by handle reaches the given frameNumber. If the Layer identified
+        // by handle is removed, then we will apply this transaction regardless of
+        // what frame number has been reached.
+        Transaction& deferTransactionUntil(const sp<SurfaceControl>& sc,
+                const sp<IBinder>& handle,
+                uint64_t frameNumber);
+        // A variant of deferTransactionUntil which identifies the Layer we wait for by
+        // Surface instead of Handle. Useful for clients which may not have the
+        // SurfaceControl for some of their Surfaces. Otherwise behaves identically.
+        Transaction& deferTransactionUntil(const sp<SurfaceControl>& sc,
+                const sp<Surface>& barrierSurface,
+                uint64_t frameNumber);
+        // Reparents all children of this layer to the new parent handle.
+        Transaction& reparentChildren(const sp<SurfaceControl>& sc,
+                const sp<IBinder>& newParentHandle);
+
+        /// Reparents the current layer to the new parent handle. The new parent must not be null.
+        // This can be used instead of reparentChildren if the caller wants to
+        // only re-parent a specific child.
+        Transaction& reparent(const sp<SurfaceControl>& sc,
+                const sp<IBinder>& newParentHandle);
+
+        Transaction& setColor(const sp<SurfaceControl>& sc, const half3& color);
+
+        // Detaches all child surfaces (and their children recursively)
+        // from their SurfaceControl.
+        // The child SurfaceControls will not throw exceptions or return errors,
+        // but transactions will have no effect.
+        // The child surfaces will continue to follow their parent surfaces,
+        // and remain eligible for rendering, but their relative state will be
+        // frozen. We use this in the WindowManager, in app shutdown/relaunch
+        // scenarios, where the app would otherwise clean up its child Surfaces.
+        // Sometimes the WindowManager needs to extend their lifetime slightly
+        // in order to perform an exit animation or prevent flicker.
+        Transaction& detachChildren(const sp<SurfaceControl>& sc);
+        // Set an override scaling mode as documented in <system/window.h>
+        // the override scaling mode will take precedence over any client
+        // specified scaling mode. -1 will clear the override scaling mode.
+        Transaction& setOverrideScalingMode(const sp<SurfaceControl>& sc,
+                int32_t overrideScalingMode);
+
+        // If the size changes in this transaction, all geometry updates specified
+        // in this transaction will not complete until a buffer of the new size
+        // arrives. As some elements normally apply immediately, this enables
+        // freezing the total geometry of a surface until a resize is completed.
+        Transaction& setGeometryAppliesWithResize(const sp<SurfaceControl>& sc);
+
+        status_t setDisplaySurface(const sp<IBinder>& token,
+                const sp<IGraphicBufferProducer>& bufferProducer);
+
+        void setDisplayLayerStack(const sp<IBinder>& token, uint32_t layerStack);
+
+        /* setDisplayProjection() defines the projection of layer stacks
+         * to a given display.
+         *
+         * - orientation defines the display's orientation.
+         * - layerStackRect defines which area of the window manager coordinate
+         * space will be used.
+         * - displayRect defines where on the display will layerStackRect be
+         * mapped to. displayRect is specified post-orientation, that is
+         * it uses the orientation seen by the end-user.
+         */
+        void setDisplayProjection(const sp<IBinder>& token,
+                uint32_t orientation,
+                const Rect& layerStackRect,
+                const Rect& displayRect);
+        void setDisplaySize(const sp<IBinder>& token, uint32_t width, uint32_t height);
+        void setAnimationTransaction();
+    };
 
     status_t    destroySurface(const sp<IBinder>& id);
 
     status_t clearLayerFrameStats(const sp<IBinder>& token) const;
     status_t getLayerFrameStats(const sp<IBinder>& token, FrameStats* outStats) const;
-
     static status_t clearAnimationFrameStats();
     static status_t getAnimationFrameStats(FrameStats* outStats);
 
     static status_t getHdrCapabilities(const sp<IBinder>& display,
             HdrCapabilities* outCapabilities);
 
-    static status_t setDisplaySurface(const sp<IBinder>& token,
-            sp<IGraphicBufferProducer> bufferProducer);
-    static void setDisplayLayerStack(const sp<IBinder>& token,
-            uint32_t layerStack);
-    static void setDisplaySize(const sp<IBinder>& token, uint32_t width, uint32_t height);
-
-    /* setDisplayProjection() defines the projection of layer stacks
-     * to a given display.
-     *
-     * - orientation defines the display's orientation.
-     * - layerStackRect defines which area of the window manager coordinate
-     * space will be used.
-     * - displayRect defines where on the display will layerStackRect be
-     * mapped to. displayRect is specified post-orientation, that is
-     * it uses the orientation seen by the end-user.
-     */
     static void setDisplayProjection(const sp<IBinder>& token,
             uint32_t orientation,
             const Rect& layerStackRect,
             const Rect& displayRect);
 
+    inline sp<ISurfaceComposerClient> getClient() { return mClient; }
+
 private:
     virtual void onFirstRef();
-    Composer& getComposer();
 
     mutable     Mutex                       mLock;
                 status_t                    mStatus;
                 sp<ISurfaceComposerClient>  mClient;
-                Composer&                   mComposer;
                 wp<IGraphicBufferProducer>  mParent;
 };
 
diff --git a/libs/gui/include/gui/SurfaceControl.h b/libs/gui/include/gui/SurfaceControl.h
index e98e26a..384815d 100644
--- a/libs/gui/include/gui/SurfaceControl.h
+++ b/libs/gui/include/gui/SurfaceControl.h
@@ -61,93 +61,6 @@
     // disconnect any api that's connected
     void        disconnect();
 
-    status_t    setLayerStack(uint32_t layerStack);
-    status_t    setLayer(int32_t layer);
-
-    // Sets a Z order relative to the Surface specified by "relativeTo" but
-    // without becoming a full child of the relative. Z-ordering works exactly
-    // as if it were a child however.
-    //
-    // As a nod to sanity, only non-child surfaces may have a relative Z-order.
-    //
-    // This overrides any previous and is overriden by any future calls
-    // to setLayer.
-    //
-    // If the relative dissapears, the Surface will have no layer and be
-    // invisible, until the next time set(Relative)Layer is called.
-    //
-    // TODO: This is probably a hack. Currently it exists only to work around
-    // some framework usage of the hidden APPLICATION_MEDIA_OVERLAY window type
-    // which allows inserting a window between a SurfaceView and it's main application
-    // window. However, since we are using child windows for the SurfaceView, but not using
-    // child windows elsewhere in O, the WindowManager can't set the layer appropriately.
-    // This is only used by the "TvInputService" and following the port of ViewRootImpl
-    // to child surfaces, we can then port this and remove this method.
-    status_t    setRelativeLayer(const sp<IBinder>& relativeTo, int32_t layer);
-    status_t    setPosition(float x, float y);
-    status_t    setSize(uint32_t w, uint32_t h);
-    status_t    hide();
-    status_t    show();
-    status_t    setFlags(uint32_t flags, uint32_t mask);
-    status_t    setTransparentRegionHint(const Region& transparent);
-    status_t    setAlpha(float alpha=1.0f);
-    status_t    setColor(const half3& color);
-
-    // Experimentarily it appears that the matrix transforms the
-    // on-screen rectangle and it's contents before the position is
-    // applied.
-    //
-    // TODO: Test with other combinations to find approximate transformation rules.
-    //
-    // For example:
-    // Layer sized (W,H) set to position (x,y) with matrix M=[-1, 0, 0, 1] (Horizontal flip) gives
-    // [((0, 0), (W, H)) x M] + (x,y) = ((-W, 0), (0, H)) + (x,y) = ((-W + x, y), (x, H+y))
-    status_t    setMatrix(float dsdx, float dtdx, float dtdy, float dsdy);
-    status_t    setCrop(const Rect& crop);
-    status_t    setFinalCrop(const Rect& crop);
-
-    // If the size changes in this transaction, all geometry updates specified
-    // in this transaction will not complete until a buffer of the new size
-    // arrives. As some elements normally apply immediately, this enables
-    // freezing the total geometry of a surface until a resize is completed.
-    status_t    setGeometryAppliesWithResize();
-
-    // Defers applying any changes made in this transaction until the Layer
-    // identified by handle reaches the given frameNumber. If the Layer identified
-    // by handle is removed, then we will apply this transaction regardless of
-    // what frame number has been reached.
-    status_t deferTransactionUntil(const sp<IBinder>& handle, uint64_t frameNumber);
-
-    // A variant of deferTransactionUntil which identifies the Layer we wait for by
-    // Surface instead of Handle. Useful for clients which may not have the
-    // SurfaceControl for some of their Surfaces. Otherwise behaves identically.
-    status_t deferTransactionUntil(const sp<Surface>& barrier, uint64_t frameNumber);
-
-    // Reparents all children of this layer to the new parent handle.
-    status_t reparentChildren(const sp<IBinder>& newParentHandle);
-
-    // Reparents the current layer to the new parent handle. The new parent must not be null.
-    // This can be used instead of reparentChildren if the caller wants to
-    // only re-parent a specific child.
-    status_t reparent(const sp<IBinder>& newParentHandle);
-
-    // Detaches all child surfaces (and their children recursively)
-    // from their SurfaceControl.
-    // The child SurfaceControl's will not throw exceptions or return errors,
-    // but transactions will have no effect.
-    // The child surfaces will continue to follow their parent surfaces,
-    // and remain eligible for rendering, but their relative state will be
-    // frozen. We use this in the WindowManager, in app shutdown/relaunch
-    // scenarios, where the app would otherwise clean up its child Surfaces.
-    // Sometimes the WindowManager needs to extend their lifetime slightly
-    // in order to perform an exit animation or prevent flicker.
-    status_t detachChildren();
-
-    // Set an override scaling mode as documented in <system/window.h>
-    // the override scaling mode will take precedence over any client
-    // specified scaling mode. -1 will clear the override scaling mode.
-    status_t setOverrideScalingMode(int32_t overrideScalingMode);
-
     static status_t writeSurfaceToParcel(
             const sp<SurfaceControl>& control, Parcel* parcel);
 
@@ -158,6 +71,8 @@
     status_t clearLayerFrameStats() const;
     status_t getLayerFrameStats(FrameStats* outStats) const;
 
+    sp<SurfaceComposerClient> getClient() const;
+
 private:
     // can't be copied
     SurfaceControl& operator = (SurfaceControl& rhs);
diff --git a/libs/gui/tests/GLTest.cpp b/libs/gui/tests/GLTest.cpp
index 1739d9c..a91552f 100644
--- a/libs/gui/tests/GLTest.cpp
+++ b/libs/gui/tests/GLTest.cpp
@@ -22,6 +22,8 @@
 
 namespace android {
 
+using Transaction = SurfaceComposerClient::Transaction;
+
 static int abs(int value) {
     return value > 0 ? value : -value;
 }
@@ -68,10 +70,10 @@
         ASSERT_TRUE(mSurfaceControl != NULL);
         ASSERT_TRUE(mSurfaceControl->isValid());
 
-        SurfaceComposerClient::openGlobalTransaction();
-        ASSERT_EQ(NO_ERROR, mSurfaceControl->setLayer(0x7FFFFFFF));
-        ASSERT_EQ(NO_ERROR, mSurfaceControl->show());
-        SurfaceComposerClient::closeGlobalTransaction();
+        Transaction t;
+        ASSERT_EQ(NO_ERROR, t.setLayer(mSurfaceControl, 0x7FFFFFFF)
+                .show(mSurfaceControl)
+                .apply());
 
         sp<ANativeWindow> window = mSurfaceControl->getSurface();
         mEglSurface = createWindowSurface(mEglDisplay, mGlConfig, window);
diff --git a/libs/gui/tests/Surface_test.cpp b/libs/gui/tests/Surface_test.cpp
index 45e95a5..bfcd75f 100644
--- a/libs/gui/tests/Surface_test.cpp
+++ b/libs/gui/tests/Surface_test.cpp
@@ -42,6 +42,8 @@
 using namespace android::hardware::configstore;
 using namespace android::hardware::configstore::V1_0;
 
+using Transaction = SurfaceComposerClient::Transaction;
+
 static bool hasWideColorDisplay =
         getBool<ISurfaceFlingerConfigs, &ISurfaceFlingerConfigs::hasWideColorDisplay>(false);
 
@@ -69,10 +71,10 @@
         ASSERT_TRUE(mSurfaceControl != NULL);
         ASSERT_TRUE(mSurfaceControl->isValid());
 
-        SurfaceComposerClient::openGlobalTransaction();
-        ASSERT_EQ(NO_ERROR, mSurfaceControl->setLayer(0x7fffffff));
-        ASSERT_EQ(NO_ERROR, mSurfaceControl->show());
-        SurfaceComposerClient::closeGlobalTransaction();
+        Transaction t;
+        ASSERT_EQ(NO_ERROR, t.setLayer(mSurfaceControl, 0x7fffffff)
+                .show(mSurfaceControl)
+                .apply());
 
         mSurface = mSurfaceControl->getSurface();
         ASSERT_TRUE(mSurface != NULL);