diff --git a/libs/gui/BufferItem.cpp b/libs/gui/BufferItem.cpp
index f50379b..5beba02 100644
--- a/libs/gui/BufferItem.cpp
+++ b/libs/gui/BufferItem.cpp
@@ -39,8 +39,8 @@
 }
 
 BufferItem::BufferItem() :
-    mGraphicBuffer(NULL),
-    mFence(NULL),
+    mGraphicBuffer(nullptr),
+    mFence(nullptr),
     mCrop(Rect::INVALID_RECT),
     mTransform(0),
     mScalingMode(NATIVE_WINDOW_SCALING_MODE_FREEZE),
@@ -91,11 +91,11 @@
 
 size_t BufferItem::getFlattenedSize() const {
     size_t size = sizeof(uint32_t); // Flags
-    if (mGraphicBuffer != 0) {
+    if (mGraphicBuffer != nullptr) {
         size += mGraphicBuffer->getFlattenedSize();
         size = FlattenableUtils::align<4>(size);
     }
-    if (mFence != 0) {
+    if (mFence != nullptr) {
         size += mFence->getFlattenedSize();
         size = FlattenableUtils::align<4>(size);
     }
@@ -107,10 +107,10 @@
 
 size_t BufferItem::getFdCount() const {
     size_t count = 0;
-    if (mGraphicBuffer != 0) {
+    if (mGraphicBuffer != nullptr) {
         count += mGraphicBuffer->getFdCount();
     }
-    if (mFence != 0) {
+    if (mFence != nullptr) {
         count += mFence->getFdCount();
     }
     return count;
@@ -137,13 +137,13 @@
     FlattenableUtils::advance(buffer, size, sizeof(uint32_t));
 
     flags = 0;
-    if (mGraphicBuffer != 0) {
+    if (mGraphicBuffer != nullptr) {
         status_t err = mGraphicBuffer->flatten(buffer, size, fds, count);
         if (err) return err;
         size -= FlattenableUtils::align<4>(buffer);
         flags |= 1;
     }
-    if (mFence != 0) {
+    if (mFence != nullptr) {
         status_t err = mFence->flatten(buffer, size, fds, count);
         if (err) return err;
         size -= FlattenableUtils::align<4>(buffer);
diff --git a/libs/gui/BufferItemConsumer.cpp b/libs/gui/BufferItemConsumer.cpp
index 89bc0c4..f50bc20 100644
--- a/libs/gui/BufferItemConsumer.cpp
+++ b/libs/gui/BufferItemConsumer.cpp
@@ -107,7 +107,7 @@
 
 void BufferItemConsumer::freeBufferLocked(int slotIndex) {
     sp<BufferFreedListener> listener = mBufferFreedListener.promote();
-    if (listener != NULL && mSlots[slotIndex].mGraphicBuffer != NULL) {
+    if (listener != nullptr && mSlots[slotIndex].mGraphicBuffer != nullptr) {
         // Fire callback if we have a listener registered and the buffer being freed is valid.
         BI_LOGV("actually calling onBufferFreed");
         listener->onBufferFreed(mSlots[slotIndex].mGraphicBuffer);
diff --git a/libs/gui/BufferQueue.cpp b/libs/gui/BufferQueue.cpp
index a8da134..5fb3f0b 100644
--- a/libs/gui/BufferQueue.cpp
+++ b/libs/gui/BufferQueue.cpp
@@ -38,7 +38,7 @@
 
 void BufferQueue::ProxyConsumerListener::onDisconnect() {
     sp<ConsumerListener> listener(mConsumerListener.promote());
-    if (listener != NULL) {
+    if (listener != nullptr) {
         listener->onDisconnect();
     }
 }
@@ -46,7 +46,7 @@
 void BufferQueue::ProxyConsumerListener::onFrameAvailable(
         const BufferItem& item) {
     sp<ConsumerListener> listener(mConsumerListener.promote());
-    if (listener != NULL) {
+    if (listener != nullptr) {
         listener->onFrameAvailable(item);
     }
 }
@@ -54,21 +54,21 @@
 void BufferQueue::ProxyConsumerListener::onFrameReplaced(
         const BufferItem& item) {
     sp<ConsumerListener> listener(mConsumerListener.promote());
-    if (listener != NULL) {
+    if (listener != nullptr) {
         listener->onFrameReplaced(item);
     }
 }
 
 void BufferQueue::ProxyConsumerListener::onBuffersReleased() {
     sp<ConsumerListener> listener(mConsumerListener.promote());
-    if (listener != NULL) {
+    if (listener != nullptr) {
         listener->onBuffersReleased();
     }
 }
 
 void BufferQueue::ProxyConsumerListener::onSidebandStreamChanged() {
     sp<ConsumerListener> listener(mConsumerListener.promote());
-    if (listener != NULL) {
+    if (listener != nullptr) {
         listener->onSidebandStreamChanged();
     }
 }
@@ -85,21 +85,21 @@
 void BufferQueue::createBufferQueue(sp<IGraphicBufferProducer>* outProducer,
         sp<IGraphicBufferConsumer>* outConsumer,
         bool consumerIsSurfaceFlinger) {
-    LOG_ALWAYS_FATAL_IF(outProducer == NULL,
+    LOG_ALWAYS_FATAL_IF(outProducer == nullptr,
             "BufferQueue: outProducer must not be NULL");
-    LOG_ALWAYS_FATAL_IF(outConsumer == NULL,
+    LOG_ALWAYS_FATAL_IF(outConsumer == nullptr,
             "BufferQueue: outConsumer must not be NULL");
 
     sp<BufferQueueCore> core(new BufferQueueCore());
-    LOG_ALWAYS_FATAL_IF(core == NULL,
+    LOG_ALWAYS_FATAL_IF(core == nullptr,
             "BufferQueue: failed to create BufferQueueCore");
 
     sp<IGraphicBufferProducer> producer(new BufferQueueProducer(core, consumerIsSurfaceFlinger));
-    LOG_ALWAYS_FATAL_IF(producer == NULL,
+    LOG_ALWAYS_FATAL_IF(producer == nullptr,
             "BufferQueue: failed to create BufferQueueProducer");
 
     sp<IGraphicBufferConsumer> consumer(new BufferQueueConsumer(core));
-    LOG_ALWAYS_FATAL_IF(consumer == NULL,
+    LOG_ALWAYS_FATAL_IF(consumer == nullptr,
             "BufferQueue: failed to create BufferQueueConsumer");
 
     *outProducer = producer;
@@ -109,8 +109,8 @@
 #ifndef NO_BUFFERHUB
 void BufferQueue::createBufferHubQueue(sp<IGraphicBufferProducer>* outProducer,
                                        sp<IGraphicBufferConsumer>* outConsumer) {
-    LOG_ALWAYS_FATAL_IF(outProducer == NULL, "BufferQueue: outProducer must not be NULL");
-    LOG_ALWAYS_FATAL_IF(outConsumer == NULL, "BufferQueue: outConsumer must not be NULL");
+    LOG_ALWAYS_FATAL_IF(outProducer == nullptr, "BufferQueue: outProducer must not be NULL");
+    LOG_ALWAYS_FATAL_IF(outConsumer == nullptr, "BufferQueue: outConsumer must not be NULL");
 
     sp<IGraphicBufferProducer> producer;
     sp<IGraphicBufferConsumer> consumer;
@@ -118,16 +118,16 @@
     dvr::ProducerQueueConfigBuilder configBuilder;
     std::shared_ptr<dvr::ProducerQueue> producerQueue =
             dvr::ProducerQueue::Create(configBuilder.Build(), dvr::UsagePolicy{});
-    LOG_ALWAYS_FATAL_IF(producerQueue == NULL, "BufferQueue: failed to create ProducerQueue.");
+    LOG_ALWAYS_FATAL_IF(producerQueue == nullptr, "BufferQueue: failed to create ProducerQueue.");
 
     std::shared_ptr<dvr::ConsumerQueue> consumerQueue = producerQueue->CreateConsumerQueue();
-    LOG_ALWAYS_FATAL_IF(consumerQueue == NULL, "BufferQueue: failed to create ConsumerQueue.");
+    LOG_ALWAYS_FATAL_IF(consumerQueue == nullptr, "BufferQueue: failed to create ConsumerQueue.");
 
     producer = BufferHubProducer::Create(producerQueue);
     consumer = BufferHubConsumer::Create(consumerQueue);
 
-    LOG_ALWAYS_FATAL_IF(producer == NULL, "BufferQueue: failed to create BufferQueueProducer");
-    LOG_ALWAYS_FATAL_IF(consumer == NULL, "BufferQueue: failed to create BufferQueueConsumer");
+    LOG_ALWAYS_FATAL_IF(producer == nullptr, "BufferQueue: failed to create BufferQueueProducer");
+    LOG_ALWAYS_FATAL_IF(consumer == nullptr, "BufferQueue: failed to create BufferQueueConsumer");
 
     *outProducer = producer;
     *outConsumer = consumer;
diff --git a/libs/gui/BufferQueueConsumer.cpp b/libs/gui/BufferQueueConsumer.cpp
index d70e142..3837c3e 100644
--- a/libs/gui/BufferQueueConsumer.cpp
+++ b/libs/gui/BufferQueueConsumer.cpp
@@ -255,7 +255,7 @@
         // mGraphicBuffer to NULL to avoid unnecessarily remapping this buffer
         // on the consumer side
         if (outBuffer->mAcquireCalled) {
-            outBuffer->mGraphicBuffer = NULL;
+            outBuffer->mGraphicBuffer = nullptr;
         }
 
         mCore->mQueue.erase(front);
@@ -272,7 +272,7 @@
         VALIDATE_CONSISTENCY();
     }
 
-    if (listener != NULL) {
+    if (listener != nullptr) {
         for (int i = 0; i < numDroppedBuffers; ++i) {
             listener->onBufferReleased();
         }
@@ -321,10 +321,10 @@
         const sp<android::GraphicBuffer>& buffer) {
     ATRACE_CALL();
 
-    if (outSlot == NULL) {
+    if (outSlot == nullptr) {
         BQ_LOGE("attachBuffer: outSlot must not be NULL");
         return BAD_VALUE;
-    } else if (buffer == NULL) {
+    } else if (buffer == nullptr) {
         BQ_LOGE("attachBuffer: cannot attach NULL buffer");
         return BAD_VALUE;
     }
@@ -413,7 +413,7 @@
     ATRACE_BUFFER_INDEX(slot);
 
     if (slot < 0 || slot >= BufferQueueDefs::NUM_BUFFER_SLOTS ||
-            releaseFence == NULL) {
+            releaseFence == nullptr) {
         BQ_LOGE("releaseBuffer: slot %d out of range or fence %p NULL", slot,
                 releaseFence.get());
         return BAD_VALUE;
@@ -465,7 +465,7 @@
     } // Autolock scope
 
     // Call back without lock held
-    if (listener != NULL) {
+    if (listener != nullptr) {
         listener->onBufferReleased();
     }
 
@@ -476,7 +476,7 @@
         const sp<IConsumerListener>& consumerListener, bool controlledByApp) {
     ATRACE_CALL();
 
-    if (consumerListener == NULL) {
+    if (consumerListener == nullptr) {
         BQ_LOGE("connect: consumerListener may not be NULL");
         return BAD_VALUE;
     }
@@ -504,13 +504,13 @@
 
     Mutex::Autolock lock(mCore->mMutex);
 
-    if (mCore->mConsumerListener == NULL) {
+    if (mCore->mConsumerListener == nullptr) {
         BQ_LOGE("disconnect: no consumer is connected");
         return BAD_VALUE;
     }
 
     mCore->mIsAbandoned = true;
-    mCore->mConsumerListener = NULL;
+    mCore->mConsumerListener = nullptr;
     mCore->mQueue.clear();
     mCore->freeAllBuffersLocked();
     mCore->mSharedBufferSlot = BufferQueueCore::INVALID_BUFFER_SLOT;
@@ -521,7 +521,7 @@
 status_t BufferQueueConsumer::getReleasedBuffers(uint64_t *outSlotMask) {
     ATRACE_CALL();
 
-    if (outSlotMask == NULL) {
+    if (outSlotMask == nullptr) {
         BQ_LOGE("getReleasedBuffers: outSlotMask may not be NULL");
         return BAD_VALUE;
     }
@@ -673,7 +673,7 @@
         }
     }
     // Call back without lock held
-    if (listener != NULL) {
+    if (listener != nullptr) {
         listener->onBuffersReleased();
     }
 
@@ -772,7 +772,7 @@
     if (uid != shellUid) {
 #endif
         android_errorWriteWithInfoLog(0x534e4554, "27046057",
-                static_cast<int32_t>(uid), NULL, 0);
+                static_cast<int32_t>(uid), nullptr, 0);
         return PERMISSION_DENIED;
     }
 
diff --git a/libs/gui/BufferQueueProducer.cpp b/libs/gui/BufferQueueProducer.cpp
index c8021e4..ce3a90a 100644
--- a/libs/gui/BufferQueueProducer.cpp
+++ b/libs/gui/BufferQueueProducer.cpp
@@ -166,7 +166,7 @@
     } // Autolock scope
 
     // Call back without lock held
-    if (listener != NULL) {
+    if (listener != nullptr) {
         listener->onBuffersReleased();
     }
 
@@ -221,7 +221,7 @@
     } // Autolock scope
 
     // Call back without lock held
-    if (listener != NULL) {
+    if (listener != nullptr) {
         listener->onBuffersReleased();
     }
     return NO_ERROR;
@@ -450,11 +450,11 @@
 
         mSlots[found].mBufferState.dequeue();
 
-        if ((buffer == NULL) ||
+        if ((buffer == nullptr) ||
                 buffer->needsReallocation(width, height, format, BQ_LAYER_COUNT, usage))
         {
             mSlots[found].mAcquireCalled = false;
-            mSlots[found].mGraphicBuffer = NULL;
+            mSlots[found].mGraphicBuffer = nullptr;
             mSlots[found].mRequestBufferCalled = false;
             mSlots[found].mEglDisplay = EGL_NO_DISPLAY;
             mSlots[found].mEglFence = EGL_NO_SYNC_KHR;
@@ -472,7 +472,7 @@
         BQ_LOGV("dequeueBuffer: setting buffer age to %" PRIu64,
                 mCore->mBufferAge);
 
-        if (CC_UNLIKELY(mSlots[found].mFence == NULL)) {
+        if (CC_UNLIKELY(mSlots[found].mFence == nullptr)) {
             BQ_LOGE("dequeueBuffer: about to return a NULL fence - "
                     "slot=%d w=%d h=%d format=%u",
                     found, buffer->width, buffer->height, buffer->format);
@@ -613,7 +613,7 @@
         listener = mCore->mConsumerListener;
     }
 
-    if (listener != NULL) {
+    if (listener != nullptr) {
         listener->onBuffersReleased();
     }
 
@@ -624,10 +624,10 @@
         sp<Fence>* outFence) {
     ATRACE_CALL();
 
-    if (outBuffer == NULL) {
+    if (outBuffer == nullptr) {
         BQ_LOGE("detachNextBuffer: outBuffer must not be NULL");
         return BAD_VALUE;
-    } else if (outFence == NULL) {
+    } else if (outFence == nullptr) {
         BQ_LOGE("detachNextBuffer: outFence must not be NULL");
         return BAD_VALUE;
     }
@@ -671,7 +671,7 @@
         listener = mCore->mConsumerListener;
     }
 
-    if (listener != NULL) {
+    if (listener != nullptr) {
         listener->onBuffersReleased();
     }
 
@@ -682,10 +682,10 @@
         const sp<android::GraphicBuffer>& buffer) {
     ATRACE_CALL();
 
-    if (outSlot == NULL) {
+    if (outSlot == nullptr) {
         BQ_LOGE("attachBuffer: outSlot must not be NULL");
         return BAD_VALUE;
-    } else if (buffer == NULL) {
+    } else if (buffer == nullptr) {
         BQ_LOGE("attachBuffer: cannot attach NULL buffer");
         return BAD_VALUE;
     }
@@ -767,7 +767,7 @@
     const Region& surfaceDamage = input.getSurfaceDamage();
     const HdrMetadata& hdrMetadata = input.getHdrMetadata();
 
-    if (acquireFence == NULL) {
+    if (acquireFence == nullptr) {
         BQ_LOGE("queueBuffer: fence is NULL");
         return BAD_VALUE;
     }
@@ -973,9 +973,9 @@
             mCallbackCondition.wait(mCallbackMutex);
         }
 
-        if (frameAvailableListener != NULL) {
+        if (frameAvailableListener != nullptr) {
             frameAvailableListener->onFrameAvailable(item);
-        } else if (frameReplacedListener != NULL) {
+        } else if (frameReplacedListener != nullptr) {
             frameReplacedListener->onFrameReplaced(item);
         }
 
@@ -1040,7 +1040,7 @@
         BQ_LOGE("cancelBuffer: slot %d is not owned by the producer "
                 "(state = %s)", slot, mSlots[slot].mBufferState.string());
         return BAD_VALUE;
-    } else if (fence == NULL) {
+    } else if (fence == nullptr) {
         BQ_LOGE("cancelBuffer: fence is NULL");
         return BAD_VALUE;
     }
@@ -1070,7 +1070,7 @@
     ATRACE_CALL();
     Mutex::Autolock lock(mCore->mMutex);
 
-    if (outValue == NULL) {
+    if (outValue == nullptr) {
         BQ_LOGE("query: outValue was NULL");
         return BAD_VALUE;
     }
@@ -1146,12 +1146,12 @@
         return NO_INIT;
     }
 
-    if (mCore->mConsumerListener == NULL) {
+    if (mCore->mConsumerListener == nullptr) {
         BQ_LOGE("connect: BufferQueue has no consumer");
         return NO_INIT;
     }
 
-    if (output == NULL) {
+    if (output == nullptr) {
         BQ_LOGE("connect: output was NULL");
         return BAD_VALUE;
     }
@@ -1189,10 +1189,10 @@
             output->nextFrameNumber = mCore->mFrameCounter + 1;
             output->bufferReplaced = false;
 
-            if (listener != NULL) {
+            if (listener != nullptr) {
                 // Set up a death notification so that we can disconnect
                 // automatically if the remote producer dies
-                if (IInterface::asBinder(listener)->remoteBinder() != NULL) {
+                if (IInterface::asBinder(listener)->remoteBinder() != nullptr) {
                     status = IInterface::asBinder(listener)->linkToDeath(
                             static_cast<IBinder::DeathRecipient*>(this));
                     if (status != NO_ERROR) {
@@ -1269,7 +1269,7 @@
                     mCore->freeAllBuffersLocked();
 
                     // Remove our death notification callback if we have one
-                    if (mCore->mLinkedToDeath != NULL) {
+                    if (mCore->mLinkedToDeath != nullptr) {
                         sp<IBinder> token =
                                 IInterface::asBinder(mCore->mLinkedToDeath);
                         // This can fail if we're here because of the death
@@ -1279,8 +1279,8 @@
                     }
                     mCore->mSharedBufferSlot =
                             BufferQueueCore::INVALID_BUFFER_SLOT;
-                    mCore->mLinkedToDeath = NULL;
-                    mCore->mConnectedProducerListener = NULL;
+                    mCore->mLinkedToDeath = nullptr;
+                    mCore->mConnectedProducerListener = nullptr;
                     mCore->mConnectedApi = BufferQueueCore::NO_CONNECTED_API;
                     mCore->mConnectedPid = -1;
                     mCore->mSidebandStream.clear();
@@ -1303,7 +1303,7 @@
     } // Autolock scope
 
     // Call back without lock held
-    if (listener != NULL) {
+    if (listener != nullptr) {
         listener->onBuffersReleased();
         listener->onDisconnect();
     }
@@ -1319,7 +1319,7 @@
         listener = mCore->mConsumerListener;
     } // Autolock scope
 
-    if (listener != NULL) {
+    if (listener != nullptr) {
         listener->onSidebandStreamChanged();
     }
     return NO_ERROR;
@@ -1535,7 +1535,7 @@
         Mutex::Autolock lock(mCore->mMutex);
         listener = mCore->mConsumerListener;
     }
-    if (listener != NULL) {
+    if (listener != nullptr) {
         listener->addAndGetFrameTimestamps(newTimestamps, outDelta);
     }
 }
diff --git a/libs/gui/ConsumerBase.cpp b/libs/gui/ConsumerBase.cpp
index f9e292e..abd9921 100644
--- a/libs/gui/ConsumerBase.cpp
+++ b/libs/gui/ConsumerBase.cpp
@@ -96,7 +96,7 @@
 
 void ConsumerBase::freeBufferLocked(int slotIndex) {
     CB_LOGV("freeBufferLocked: slotIndex=%d", slotIndex);
-    mSlots[slotIndex].mGraphicBuffer = 0;
+    mSlots[slotIndex].mGraphicBuffer = nullptr;
     mSlots[slotIndex].mFence = Fence::NO_FENCE;
     mSlots[slotIndex].mFrameNumber = 0;
 }
@@ -110,7 +110,7 @@
         listener = mFrameAvailableListener.promote();
     }
 
-    if (listener != NULL) {
+    if (listener != nullptr) {
         CB_LOGV("actually calling onFrameAvailable");
         listener->onFrameAvailable(item);
     }
@@ -125,7 +125,7 @@
         listener = mFrameAvailableListener.promote();
     }
 
-    if (listener != NULL) {
+    if (listener != nullptr) {
         CB_LOGV("actually calling onFrameReplaced");
         listener->onFrameReplaced(item);
     }
@@ -352,8 +352,8 @@
         return err;
     }
 
-    if (item->mGraphicBuffer != NULL) {
-        if (mSlots[item->mSlot].mGraphicBuffer != NULL) {
+    if (item->mGraphicBuffer != nullptr) {
+        if (mSlots[item->mSlot].mGraphicBuffer != nullptr) {
             freeBufferLocked(item->mSlot);
         }
         mSlots[item->mSlot].mGraphicBuffer = item->mGraphicBuffer;
@@ -468,7 +468,7 @@
     if (slot < 0 || slot >= BufferQueue::NUM_BUFFER_SLOTS) {
         return false;
     }
-    return (mSlots[slot].mGraphicBuffer != NULL &&
+    return (mSlots[slot].mGraphicBuffer != nullptr &&
             mSlots[slot].mGraphicBuffer->handle == graphicBuffer->handle);
 }
 
diff --git a/libs/gui/DisplayEventReceiver.cpp b/libs/gui/DisplayEventReceiver.cpp
index 1757ec1..f5cf1c4 100644
--- a/libs/gui/DisplayEventReceiver.cpp
+++ b/libs/gui/DisplayEventReceiver.cpp
@@ -34,9 +34,9 @@
 
 DisplayEventReceiver::DisplayEventReceiver(ISurfaceComposer::VsyncSource vsyncSource) {
     sp<ISurfaceComposer> sf(ComposerService::getComposerService());
-    if (sf != NULL) {
+    if (sf != nullptr) {
         mEventConnection = sf->createDisplayEventConnection(vsyncSource);
-        if (mEventConnection != NULL) {
+        if (mEventConnection != nullptr) {
             mDataChannel = std::make_unique<gui::BitTube>();
             mEventConnection->stealReceiveChannel(mDataChannel.get());
         }
@@ -47,13 +47,13 @@
 }
 
 status_t DisplayEventReceiver::initCheck() const {
-    if (mDataChannel != NULL)
+    if (mDataChannel != nullptr)
         return NO_ERROR;
     return NO_INIT;
 }
 
 int DisplayEventReceiver::getFd() const {
-    if (mDataChannel == NULL)
+    if (mDataChannel == nullptr)
         return NO_INIT;
 
     return mDataChannel->getFd();
@@ -63,7 +63,7 @@
     if (int32_t(count) < 0)
         return BAD_VALUE;
 
-    if (mEventConnection != NULL) {
+    if (mEventConnection != nullptr) {
         mEventConnection->setVsyncRate(count);
         return NO_ERROR;
     }
@@ -71,7 +71,7 @@
 }
 
 status_t DisplayEventReceiver::requestNextVsync() {
-    if (mEventConnection != NULL) {
+    if (mEventConnection != nullptr) {
         mEventConnection->requestNextVsync();
         return NO_ERROR;
     }
diff --git a/libs/gui/GLConsumer.cpp b/libs/gui/GLConsumer.cpp
index 885efec..8efbef5 100644
--- a/libs/gui/GLConsumer.cpp
+++ b/libs/gui/GLConsumer.cpp
@@ -291,7 +291,7 @@
             return err;
         }
 
-        if (mReleasedTexImage == NULL) {
+        if (mReleasedTexImage == nullptr) {
             mReleasedTexImage = new EglImage(getDebugTexImageBuffer());
         }
 
@@ -321,7 +321,7 @@
 
 sp<GraphicBuffer> GLConsumer::getDebugTexImageBuffer() {
     Mutex::Autolock _l(sStaticInitLock);
-    if (CC_UNLIKELY(sReleasedTexImageBuffer == NULL)) {
+    if (CC_UNLIKELY(sReleasedTexImageBuffer == nullptr)) {
         // The first time, create the debug texture in case the application
         // continues to use it.
         sp<GraphicBuffer> buffer = new GraphicBuffer(
@@ -357,7 +357,7 @@
     // If item->mGraphicBuffer is not null, this buffer has not been acquired
     // before, so any prior EglImage created is using a stale buffer. This
     // replaces any old EglImage with a new one (using the new buffer).
-    if (item->mGraphicBuffer != NULL) {
+    if (item->mGraphicBuffer != nullptr) {
         int slot = item->mSlot;
         mEglSlots[slot].mEglImage = new EglImage(item->mGraphicBuffer);
     }
@@ -431,7 +431,7 @@
 
     GLC_LOGV("updateAndRelease: (slot=%d buf=%p) -> (slot=%d buf=%p)",
             mCurrentTexture, mCurrentTextureImage != NULL ?
-                    mCurrentTextureImage->graphicBufferHandle() : 0,
+                    mCurrentTextureImage->graphicBufferHandle() : nullptr,
             slot, mSlots[slot].mGraphicBuffer->handle);
 
     // Hang onto the pointer so that it isn't freed in the call to
@@ -491,7 +491,7 @@
 
     glBindTexture(mTexTarget, mTexName);
     if (mCurrentTexture == BufferQueue::INVALID_BUFFER_SLOT &&
-            mCurrentTextureImage == NULL) {
+            mCurrentTextureImage == nullptr) {
         GLC_LOGE("bindTextureImage: no currently-bound texture");
         return NO_INIT;
     }
@@ -655,7 +655,7 @@
     mTexName = tex;
     mAttached = true;
 
-    if (mCurrentTextureImage != NULL) {
+    if (mCurrentTextureImage != nullptr) {
         // This may wait for a buffer a second time. This is likely required if
         // this is a different context, since otherwise the wait could be skipped
         // by bouncing through another context. For the same context the extra
@@ -676,7 +676,7 @@
     if (mCurrentTexture != BufferQueue::INVALID_BUFFER_SLOT) {
         if (SyncFeatures::getInstance().useNativeFenceSync()) {
             EGLSyncKHR sync = eglCreateSyncKHR(dpy,
-                    EGL_SYNC_NATIVE_FENCE_ANDROID, NULL);
+                    EGL_SYNC_NATIVE_FENCE_ANDROID, nullptr);
             if (sync == EGL_NO_SYNC_KHR) {
                 GLC_LOGE("syncForReleaseLocked: error creating EGL fence: %#x",
                         eglGetError());
@@ -720,7 +720,7 @@
 
             // Create a fence for the outstanding accesses in the current
             // OpenGL ES context.
-            fence = eglCreateSyncKHR(dpy, EGL_SYNC_FENCE_KHR, NULL);
+            fence = eglCreateSyncKHR(dpy, EGL_SYNC_FENCE_KHR, nullptr);
             if (fence == EGL_NO_SYNC_KHR) {
                 GLC_LOGE("syncForReleaseLocked: error creating fence: %#x",
                         eglGetError());
@@ -752,11 +752,11 @@
     bool needsRecompute = mFilteringEnabled != enabled;
     mFilteringEnabled = enabled;
 
-    if (needsRecompute && mCurrentTextureImage==NULL) {
+    if (needsRecompute && mCurrentTextureImage==nullptr) {
         GLC_LOGD("setFilteringEnabled called with mCurrentTextureImage == NULL");
     }
 
-    if (needsRecompute && mCurrentTextureImage != NULL) {
+    if (needsRecompute && mCurrentTextureImage != nullptr) {
         computeCurrentTransformMatrixLocked();
     }
 }
@@ -938,7 +938,7 @@
     }
 
     return (mCurrentTextureImage == nullptr) ?
-            NULL : mCurrentTextureImage->graphicBuffer();
+            nullptr : mCurrentTextureImage->graphicBuffer();
 }
 
 Rect GLConsumer::getCurrentCrop() const {
@@ -1150,7 +1150,7 @@
         attrs[3] = attrs[11];
         attrs[4] = EGL_NONE;
     }
-    eglInitialize(dpy, 0, 0);
+    eglInitialize(dpy, nullptr, nullptr);
     EGLImageKHR image = eglCreateImageKHR(dpy, EGL_NO_CONTEXT,
             EGL_NATIVE_BUFFER_ANDROID, cbuf, attrs);
     if (image == EGL_NO_IMAGE_KHR) {
diff --git a/libs/gui/IGraphicBufferProducer.cpp b/libs/gui/IGraphicBufferProducer.cpp
index 0749fde..3693d2c 100644
--- a/libs/gui/IGraphicBufferProducer.cpp
+++ b/libs/gui/IGraphicBufferProducer.cpp
@@ -190,10 +190,10 @@
 
     virtual status_t detachNextBuffer(sp<GraphicBuffer>* outBuffer,
             sp<Fence>* outFence) {
-        if (outBuffer == NULL) {
+        if (outBuffer == nullptr) {
             ALOGE("detachNextBuffer: outBuffer must not be NULL");
             return BAD_VALUE;
-        } else if (outFence == NULL) {
+        } else if (outFence == nullptr) {
             ALOGE("detachNextBuffer: outFence must not be NULL");
             return BAD_VALUE;
         }
@@ -301,7 +301,7 @@
             int api, bool producerControlledByApp, QueueBufferOutput* output) {
         Parcel data, reply;
         data.writeInterfaceToken(IGraphicBufferProducer::getInterfaceDescriptor());
-        if (listener != NULL) {
+        if (listener != nullptr) {
             data.writeInt32(1);
             data.writeStrongBinder(IInterface::asBinder(listener));
         } else {
@@ -738,8 +738,8 @@
             int bufferIdx   = data.readInt32();
             sp<GraphicBuffer> buffer;
             int result = requestBuffer(bufferIdx, &buffer);
-            reply->writeInt32(buffer != 0);
-            if (buffer != 0) {
+            reply->writeInt32(buffer != nullptr);
+            if (buffer != nullptr) {
                 reply->write(*buffer);
             }
             reply->writeInt32(result);
@@ -797,12 +797,12 @@
             int32_t result = detachNextBuffer(&buffer, &fence);
             reply->writeInt32(result);
             if (result == NO_ERROR) {
-                reply->writeInt32(buffer != NULL);
-                if (buffer != NULL) {
+                reply->writeInt32(buffer != nullptr);
+                if (buffer != nullptr) {
                     reply->write(*buffer);
                 }
-                reply->writeInt32(fence != NULL);
-                if (fence != NULL) {
+                reply->writeInt32(fence != nullptr);
+                if (fence != nullptr) {
                     reply->write(*fence);
                 }
             }
diff --git a/libs/gui/StreamSplitter.cpp b/libs/gui/StreamSplitter.cpp
index 52c9067..2f8e104 100644
--- a/libs/gui/StreamSplitter.cpp
+++ b/libs/gui/StreamSplitter.cpp
@@ -38,11 +38,11 @@
 status_t StreamSplitter::createSplitter(
         const sp<IGraphicBufferConsumer>& inputQueue,
         sp<StreamSplitter>* outSplitter) {
-    if (inputQueue == NULL) {
+    if (inputQueue == nullptr) {
         ALOGE("createSplitter: inputQueue must not be NULL");
         return BAD_VALUE;
     }
-    if (outSplitter == NULL) {
+    if (outSplitter == nullptr) {
         ALOGE("createSplitter: outSplitter must not be NULL");
         return BAD_VALUE;
     }
@@ -74,7 +74,7 @@
 
 status_t StreamSplitter::addOutput(
         const sp<IGraphicBufferProducer>& outputQueue) {
-    if (outputQueue == NULL) {
+    if (outputQueue == nullptr) {
         ALOGE("addOutput: outputQueue must not be NULL");
         return BAD_VALUE;
     }
diff --git a/libs/gui/Surface.cpp b/libs/gui/Surface.cpp
index 339bd0f..7bddaaf 100644
--- a/libs/gui/Surface.cpp
+++ b/libs/gui/Surface.cpp
@@ -156,7 +156,7 @@
     ATRACE_CALL();
 
     DisplayStatInfo stats;
-    status_t result = composerService()->getDisplayStats(NULL, &stats);
+    status_t result = composerService()->getDisplayStats(nullptr, &stats);
     if (result != NO_ERROR) {
         return result;
     }
@@ -497,7 +497,7 @@
         if (mSharedBufferMode && mAutoRefresh && mSharedBufferSlot !=
                 BufferItem::INVALID_BUFFER_SLOT) {
             sp<GraphicBuffer>& gbuf(mSlots[mSharedBufferSlot].buffer);
-            if (gbuf != NULL) {
+            if (gbuf != nullptr) {
                 *buffer = gbuf.get();
                 *fenceFd = -1;
                 return OK;
@@ -537,7 +537,7 @@
     sp<GraphicBuffer>& gbuf(mSlots[buf].buffer);
 
     // this should never happen
-    ALOGE_IF(fence == NULL, "Surface::dequeueBuffer: received null Fence! buf=%d", buf);
+    ALOGE_IF(fence == nullptr, "Surface::dequeueBuffer: received null Fence! buf=%d", buf);
 
     if (result & IGraphicBufferProducer::RELEASE_ALL_BUFFERS) {
         freeAllBuffers();
@@ -615,7 +615,7 @@
 int Surface::getSlotFromBufferLocked(
         android_native_buffer_t* buffer) const {
     for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
-        if (mSlots[i].buffer != NULL &&
+        if (mSlots[i].buffer != nullptr &&
                 mSlots[i].buffer->handle == buffer->handle) {
             return i;
         }
@@ -1264,7 +1264,7 @@
     ATRACE_CALL();
     ALOGV("Surface::detachNextBuffer");
 
-    if (outBuffer == NULL || outFence == NULL) {
+    if (outBuffer == nullptr || outFence == nullptr) {
         return BAD_VALUE;
     }
 
@@ -1273,8 +1273,8 @@
         mRemovedBuffers.clear();
     }
 
-    sp<GraphicBuffer> buffer(NULL);
-    sp<Fence> fence(NULL);
+    sp<GraphicBuffer> buffer(nullptr);
+    sp<Fence> fence(nullptr);
     status_t result = mGraphicBufferProducer->detachNextBuffer(
             &buffer, &fence);
     if (result != NO_ERROR) {
@@ -1282,19 +1282,19 @@
     }
 
     *outBuffer = buffer;
-    if (fence != NULL && fence->isValid()) {
+    if (fence != nullptr && fence->isValid()) {
         *outFence = fence;
     } else {
         *outFence = Fence::NO_FENCE;
     }
 
     for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
-        if (mSlots[i].buffer != NULL &&
+        if (mSlots[i].buffer != nullptr &&
                 mSlots[i].buffer->getId() == buffer->getId()) {
             if (mReportRemovedBuffers) {
                 mRemovedBuffers.push_back(mSlots[i].buffer);
             }
-            mSlots[i].buffer = NULL;
+            mSlots[i].buffer = nullptr;
         }
     }
 
@@ -1345,7 +1345,7 @@
     ATRACE_CALL();
 
     Rect realRect(Rect::EMPTY_RECT);
-    if (rect == NULL || rect->isEmpty()) {
+    if (rect == nullptr || rect->isEmpty()) {
         realRect.clear();
     } else {
         realRect = *rect;
@@ -1572,7 +1572,7 @@
 
 void Surface::freeAllBuffers() {
     for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
-        mSlots[i].buffer = 0;
+        mSlots[i].buffer = nullptr;
     }
 }
 
@@ -1612,12 +1612,12 @@
     // src and dst with, height and format must be identical. no verification
     // is done here.
     status_t err;
-    uint8_t* src_bits = NULL;
+    uint8_t* src_bits = nullptr;
     err = src->lock(GRALLOC_USAGE_SW_READ_OFTEN, reg.bounds(),
             reinterpret_cast<void**>(&src_bits));
     ALOGE_IF(err, "error locking src buffer %s", strerror(-err));
 
-    uint8_t* dst_bits = NULL;
+    uint8_t* dst_bits = nullptr;
     err = dst->lockAsync(GRALLOC_USAGE_SW_WRITE_OFTEN, reg.bounds(),
             reinterpret_cast<void**>(&dst_bits), *dstFenceFd);
     ALOGE_IF(err, "error locking dst buffer %s", strerror(-err));
@@ -1665,7 +1665,7 @@
 status_t Surface::lock(
         ANativeWindow_Buffer* outBuffer, ARect* inOutDirtyBounds)
 {
-    if (mLockedBuffer != 0) {
+    if (mLockedBuffer != nullptr) {
         ALOGE("Surface::lock failed, already locked");
         return INVALID_OPERATION;
     }
@@ -1697,7 +1697,7 @@
 
         // figure out if we can copy the frontbuffer back
         const sp<GraphicBuffer>& frontBuffer(mPostedBuffer);
-        const bool canCopyBack = (frontBuffer != 0 &&
+        const bool canCopyBack = (frontBuffer != nullptr &&
                 backBuffer->width  == frontBuffer->width &&
                 backBuffer->height == frontBuffer->height &&
                 backBuffer->format == frontBuffer->format);
@@ -1759,7 +1759,7 @@
 
 status_t Surface::unlockAndPost()
 {
-    if (mLockedBuffer == 0) {
+    if (mLockedBuffer == nullptr) {
         ALOGE("Surface::unlockAndPost failed, no locked buffer");
         return INVALID_OPERATION;
     }
@@ -1773,7 +1773,7 @@
             mLockedBuffer->handle, strerror(-err));
 
     mPostedBuffer = mLockedBuffer;
-    mLockedBuffer = 0;
+    mLockedBuffer = nullptr;
     return err;
 }
 
diff --git a/libs/gui/SurfaceComposerClient.cpp b/libs/gui/SurfaceComposerClient.cpp
index 63560c4..d2b472b 100644
--- a/libs/gui/SurfaceComposerClient.cpp
+++ b/libs/gui/SurfaceComposerClient.cpp
@@ -81,7 +81,7 @@
 /*static*/ sp<ISurfaceComposer> ComposerService::getComposerService() {
     ComposerService& instance = ComposerService::getInstance();
     Mutex::Autolock _l(instance.mLock);
-    if (instance.mComposerService == NULL) {
+    if (instance.mComposerService == nullptr) {
         ComposerService::getInstance().connectLocked();
         assert(instance.mComposerService != NULL);
         ALOGD("ComposerService reconnected");
@@ -92,8 +92,8 @@
 void ComposerService::composerServiceDied()
 {
     Mutex::Autolock _l(mLock);
-    mComposerService = NULL;
-    mDeathObserver = NULL;
+    mComposerService = nullptr;
+    mDeathObserver = nullptr;
 }
 
 // ---------------------------------------------------------------------------
@@ -571,12 +571,12 @@
 
 void SurfaceComposerClient::onFirstRef() {
     sp<ISurfaceComposer> sf(ComposerService::getComposerService());
-    if (sf != 0 && mStatus == NO_INIT) {
+    if (sf != nullptr && mStatus == NO_INIT) {
         auto rootProducer = mParent.promote();
         sp<ISurfaceComposerClient> conn;
         conn = (rootProducer != nullptr) ? sf->createScopedConnection(rootProducer) :
                 sf->createConnection();
-        if (conn != 0) {
+        if (conn != nullptr) {
             mClient = conn;
             mStatus = NO_ERROR;
         }
@@ -606,7 +606,7 @@
     // this can be called more than once.
     sp<ISurfaceComposerClient> client;
     Mutex::Autolock _lm(mLock);
-    if (mClient != 0) {
+    if (mClient != nullptr) {
         client = mClient; // hold ref while lock is held
         mClient.clear();
     }
@@ -766,7 +766,7 @@
                                    bool useIdentityTransform, uint32_t rotation,
                                    sp<GraphicBuffer>* outBuffer) {
     sp<ISurfaceComposer> s(ComposerService::getComposerService());
-    if (s == NULL) return NO_INIT;
+    if (s == nullptr) return NO_INIT;
     status_t ret = s->captureScreen(display, outBuffer, sourceCrop, reqWidth, reqHeight, minLayerZ,
                                     maxLayerZ, useIdentityTransform,
                                     static_cast<ISurfaceComposer::Rotation>(rotation));
@@ -779,7 +779,7 @@
 status_t ScreenshotClient::captureLayers(const sp<IBinder>& layerHandle, Rect sourceCrop,
                                          float frameScale, sp<GraphicBuffer>* outBuffer) {
     sp<ISurfaceComposer> s(ComposerService::getComposerService());
-    if (s == NULL) return NO_INIT;
+    if (s == nullptr) return NO_INIT;
     status_t ret = s->captureLayers(layerHandle, outBuffer, sourceCrop, frameScale,
                                     false /* childrenOnly */);
     return ret;
@@ -788,7 +788,7 @@
 status_t ScreenshotClient::captureChildLayers(const sp<IBinder>& layerHandle, Rect sourceCrop,
                                               float frameScale, sp<GraphicBuffer>* outBuffer) {
     sp<ISurfaceComposer> s(ComposerService::getComposerService());
-    if (s == NULL) return NO_INIT;
+    if (s == nullptr) return NO_INIT;
     status_t ret = s->captureLayers(layerHandle, outBuffer, sourceCrop, frameScale,
                                     true /* childrenOnly */);
     return ret;
diff --git a/libs/gui/SurfaceControl.cpp b/libs/gui/SurfaceControl.cpp
index 5eafbb3..19ad31b 100644
--- a/libs/gui/SurfaceControl.cpp
+++ b/libs/gui/SurfaceControl.cpp
@@ -86,7 +86,7 @@
 }
 
 void SurfaceControl::disconnect() {
-    if (mGraphicBufferProducer != NULL) {
+    if (mGraphicBufferProducer != nullptr) {
         mGraphicBufferProducer->disconnect(
                 BufferQueueCore::CURRENTLY_CONNECTED_API);
     }
@@ -95,7 +95,7 @@
 bool SurfaceControl::isSameSurface(
         const sp<SurfaceControl>& lhs, const sp<SurfaceControl>& rhs)
 {
-    if (lhs == 0 || rhs == 0)
+    if (lhs == nullptr || rhs == nullptr)
         return false;
     return lhs->mHandle == rhs->mHandle;
 }
@@ -116,7 +116,7 @@
 
 status_t SurfaceControl::validate() const
 {
-    if (mHandle==0 || mClient==0) {
+    if (mHandle==nullptr || mClient==nullptr) {
         ALOGE("invalid handle (%p) or client (%p)",
                 mHandle.get(), mClient.get());
         return NO_INIT;
@@ -128,7 +128,7 @@
         const sp<SurfaceControl>& control, Parcel* parcel)
 {
     sp<IGraphicBufferProducer> bp;
-    if (control != NULL) {
+    if (control != nullptr) {
         bp = control->mGraphicBufferProducer;
     }
     return parcel->writeStrongBinder(IInterface::asBinder(bp));
@@ -146,7 +146,7 @@
 sp<Surface> SurfaceControl::getSurface() const
 {
     Mutex::Autolock _l(mLock);
-    if (mSurfaceData == 0) {
+    if (mSurfaceData == nullptr) {
         return generateSurfaceLocked();
     }
     return mSurfaceData;
diff --git a/libs/gui/SyncFeatures.cpp b/libs/gui/SyncFeatures.cpp
index afa15c5..fcae05c 100644
--- a/libs/gui/SyncFeatures.cpp
+++ b/libs/gui/SyncFeatures.cpp
@@ -41,7 +41,7 @@
     // This can only be called after EGL has been initialized; otherwise the
     // check below will abort.
     const char* exts = eglQueryStringImplementationANDROID(dpy, EGL_EXTENSIONS);
-    LOG_ALWAYS_FATAL_IF(exts == NULL, "eglQueryStringImplementationANDROID failed");
+    LOG_ALWAYS_FATAL_IF(exts == nullptr, "eglQueryStringImplementationANDROID failed");
     if (strstr(exts, "EGL_ANDROID_native_fence_sync")) {
         // This makes GLConsumer use the EGL_ANDROID_native_fence_sync
         // extension to create Android native fences to signal when all