diff --git a/libs/gui/BufferQueueCore.cpp b/libs/gui/BufferQueueCore.cpp
index bb703da..960b194 100644
--- a/libs/gui/BufferQueueCore.cpp
+++ b/libs/gui/BufferQueueCore.cpp
@@ -349,7 +349,7 @@
                 BQ_LOGE("Slot %d is in mUnusedSlots but is not FREE", slot);
                 usleep(PAUSE_TIME);
             }
-            if (mSlots[slot].mGraphicBuffer != NULL) {
+            if (mSlots[slot].mGraphicBuffer != nullptr) {
                 BQ_LOGE("Slot %d is in mUnusedSluts but has an active buffer",
                         slot);
                 usleep(PAUSE_TIME);
@@ -371,7 +371,7 @@
                 BQ_LOGE("Slot %d is in mFreeSlots but is not FREE", slot);
                 usleep(PAUSE_TIME);
             }
-            if (mSlots[slot].mGraphicBuffer != NULL) {
+            if (mSlots[slot].mGraphicBuffer != nullptr) {
                 BQ_LOGE("Slot %d is in mFreeSlots but has a buffer",
                         slot);
                 usleep(PAUSE_TIME);
@@ -394,7 +394,7 @@
                 BQ_LOGE("Slot %d is in mFreeBuffers but is not FREE", slot);
                 usleep(PAUSE_TIME);
             }
-            if (mSlots[slot].mGraphicBuffer == NULL) {
+            if (mSlots[slot].mGraphicBuffer == nullptr) {
                 BQ_LOGE("Slot %d is in mFreeBuffers but has no buffer", slot);
                 usleep(PAUSE_TIME);
             }
@@ -418,7 +418,7 @@
                 BQ_LOGE("Slot %d is in mActiveBuffers but is FREE", slot);
                 usleep(PAUSE_TIME);
             }
-            if (mSlots[slot].mGraphicBuffer == NULL && !mIsAllocating) {
+            if (mSlots[slot].mGraphicBuffer == nullptr && !mIsAllocating) {
                 BQ_LOGE("Slot %d is in mActiveBuffers but has no buffer", slot);
                 usleep(PAUSE_TIME);
             }
diff --git a/libs/gui/GLConsumer.cpp b/libs/gui/GLConsumer.cpp
index 6237aa0..5532db4 100644
--- a/libs/gui/GLConsumer.cpp
+++ b/libs/gui/GLConsumer.cpp
@@ -405,7 +405,7 @@
     }
 
     GLC_LOGV("updateAndRelease: (slot=%d buf=%p) -> (slot=%d buf=%p)",
-            mCurrentTexture, mCurrentTextureImage != NULL ?
+            mCurrentTexture, mCurrentTextureImage != nullptr ?
                     mCurrentTextureImage->graphicBufferHandle() : nullptr,
             slot, mSlots[slot].mGraphicBuffer->handle);
 
diff --git a/libs/gui/SurfaceComposerClient.cpp b/libs/gui/SurfaceComposerClient.cpp
index d2b472b..fc076d2 100644
--- a/libs/gui/SurfaceComposerClient.cpp
+++ b/libs/gui/SurfaceComposerClient.cpp
@@ -60,7 +60,7 @@
     while (getService(name, &mComposerService) != NO_ERROR) {
         usleep(250000);
     }
-    assert(mComposerService != NULL);
+    assert(mComposerService != nullptr);
 
     // Create the death listener.
     class DeathObserver : public IBinder::DeathRecipient {
@@ -83,7 +83,7 @@
     Mutex::Autolock _l(instance.mLock);
     if (instance.mComposerService == nullptr) {
         ComposerService::getInstance().connectLocked();
-        assert(instance.mComposerService != NULL);
+        assert(instance.mComposerService != nullptr);
         ALOGD("ComposerService reconnected");
     }
     return instance.mComposerService;
diff --git a/libs/gui/include/gui/CpuConsumer.h b/libs/gui/include/gui/CpuConsumer.h
index d375611..806fbe8 100644
--- a/libs/gui/include/gui/CpuConsumer.h
+++ b/libs/gui/include/gui/CpuConsumer.h
@@ -70,7 +70,7 @@
         uint32_t    chromaStep;
 
         LockedBuffer() :
-            data(NULL),
+            data(nullptr),
             width(0),
             height(0),
             format(PIXEL_FORMAT_NONE),
@@ -82,8 +82,8 @@
             dataSpace(HAL_DATASPACE_UNKNOWN),
             frameNumber(0),
             flexFormat(PIXEL_FORMAT_NONE),
-            dataCb(NULL),
-            dataCr(NULL),
+            dataCb(nullptr),
+            dataCr(nullptr),
             chromaStride(0),
             chromaStep(0)
         {}
diff --git a/libs/gui/include/gui/GLConsumer.h b/libs/gui/include/gui/GLConsumer.h
index 25f9d6b..46a99e1 100644
--- a/libs/gui/include/gui/GLConsumer.h
+++ b/libs/gui/include/gui/GLConsumer.h
@@ -314,7 +314,7 @@
 
         const sp<GraphicBuffer>& graphicBuffer() { return mGraphicBuffer; }
         const native_handle* graphicBufferHandle() {
-            return mGraphicBuffer == NULL ? NULL : mGraphicBuffer->handle;
+            return mGraphicBuffer == nullptr ? nullptr : mGraphicBuffer->handle;
         }
 
     private:
diff --git a/libs/gui/include/gui/IGraphicBufferProducer.h b/libs/gui/include/gui/IGraphicBufferProducer.h
index 887654e..8ff8d81 100644
--- a/libs/gui/include/gui/IGraphicBufferProducer.h
+++ b/libs/gui/include/gui/IGraphicBufferProducer.h
@@ -345,7 +345,7 @@
             *outScalingMode = scalingMode;
             *outTransform = transform;
             *outFence = fence;
-            if (outStickyTransform != NULL) {
+            if (outStickyTransform != nullptr) {
                 *outStickyTransform = stickyTransform;
             }
             if (outGetFrameTimestamps) {
diff --git a/libs/gui/include/gui/Surface.h b/libs/gui/include/gui/Surface.h
index 9aeafae..32ee595 100644
--- a/libs/gui/include/gui/Surface.h
+++ b/libs/gui/include/gui/Surface.h
@@ -80,7 +80,7 @@
     /* convenience function to check that the given surface is non NULL as
      * well as its IGraphicBufferProducer */
     static bool isValid(const sp<Surface>& surface) {
-        return surface != NULL && surface->getIGraphicBufferProducer() != NULL;
+        return surface != nullptr && surface->getIGraphicBufferProducer() != nullptr;
     }
 
     /* Attaches a sideband buffer stream to the Surface's IGraphicBufferProducer.
diff --git a/libs/gui/include/gui/SurfaceComposerClient.h b/libs/gui/include/gui/SurfaceComposerClient.h
index 377fe68..34708c7 100644
--- a/libs/gui/include/gui/SurfaceComposerClient.h
+++ b/libs/gui/include/gui/SurfaceComposerClient.h
@@ -69,7 +69,7 @@
 
     // callback when the composer is dies
     status_t linkToComposerDeath(const sp<IBinder::DeathRecipient>& recipient,
-            void* cookie = NULL, uint32_t flags = 0);
+            void* cookie = nullptr, uint32_t flags = 0);
 
     // Get a list of supported configurations for a given display
     static status_t getDisplayConfigs(const sp<IBinder>& display,
diff --git a/libs/gui/include/gui/SurfaceControl.h b/libs/gui/include/gui/SurfaceControl.h
index bd987dd..ccb30fa 100644
--- a/libs/gui/include/gui/SurfaceControl.h
+++ b/libs/gui/include/gui/SurfaceControl.h
@@ -48,11 +48,11 @@
     void writeToParcel(Parcel* parcel);
 
     static bool isValid(const sp<SurfaceControl>& surface) {
-        return (surface != 0) && surface->isValid();
+        return (surface != nullptr) && surface->isValid();
     }
 
     bool isValid() {
-        return mHandle!=0 && mClient!=0;
+        return mHandle!=nullptr && mClient!=nullptr;
     }
 
     static bool isSameSurface(
diff --git a/libs/gui/tests/BufferQueue_test.cpp b/libs/gui/tests/BufferQueue_test.cpp
index 9a20859..119e888 100644
--- a/libs/gui/tests/BufferQueue_test.cpp
+++ b/libs/gui/tests/BufferQueue_test.cpp
@@ -61,7 +61,7 @@
     }
 
     void GetMinUndequeuedBufferCount(int* bufferCount) {
-        ASSERT_TRUE(bufferCount != NULL);
+        ASSERT_TRUE(bufferCount != nullptr);
         ASSERT_EQ(OK, mProducer->query(NATIVE_WINDOW_MIN_UNDEQUEUED_BUFFERS,
                     bufferCount));
         ASSERT_GE(*bufferCount, 0);
@@ -82,7 +82,7 @@
         sp<Fence> fence;
 
         input.deflate(&timestamp, &isAutoTimestamp, &dataSpace, &crop,
-                &scalingMode, &transform, &fence, NULL);
+                &scalingMode, &transform, &fence, nullptr);
         ASSERT_EQ(timestamp, item.mTimestamp);
         ASSERT_EQ(isAutoTimestamp, item.mIsAutoTimestamp);
         ASSERT_EQ(dataSpace, item.mDataSpace);
@@ -128,17 +128,17 @@
     sp<IBinder> binderProducer =
         serviceManager->getService(PRODUCER_NAME);
     mProducer = interface_cast<IGraphicBufferProducer>(binderProducer);
-    EXPECT_TRUE(mProducer != NULL);
+    EXPECT_TRUE(mProducer != nullptr);
     sp<IBinder> binderConsumer =
         serviceManager->getService(CONSUMER_NAME);
     mConsumer = interface_cast<IGraphicBufferConsumer>(binderConsumer);
-    EXPECT_TRUE(mConsumer != NULL);
+    EXPECT_TRUE(mConsumer != nullptr);
 
     sp<DummyConsumer> dc(new DummyConsumer);
     ASSERT_EQ(OK, mConsumer->consumerConnect(dc, false));
     IGraphicBufferProducer::QueueBufferOutput output;
     ASSERT_EQ(OK,
-            mProducer->connect(NULL, NATIVE_WINDOW_API_CPU, false, &output));
+            mProducer->connect(nullptr, NATIVE_WINDOW_API_CPU, false, &output));
 
     int slot;
     sp<Fence> fence;
@@ -353,8 +353,8 @@
     ASSERT_EQ(OK, buffer->unlock());
 
     int newSlot;
-    ASSERT_EQ(BAD_VALUE, mProducer->attachBuffer(NULL, safeToClobberBuffer));
-    ASSERT_EQ(BAD_VALUE, mProducer->attachBuffer(&newSlot, NULL));
+    ASSERT_EQ(BAD_VALUE, mProducer->attachBuffer(nullptr, safeToClobberBuffer));
+    ASSERT_EQ(BAD_VALUE, mProducer->attachBuffer(&newSlot, nullptr));
 
     ASSERT_EQ(OK, mProducer->attachBuffer(&newSlot, buffer));
     IGraphicBufferProducer::QueueBufferInput input(0, false,
@@ -412,8 +412,8 @@
 
     int newSlot;
     sp<GraphicBuffer> safeToClobberBuffer;
-    ASSERT_EQ(BAD_VALUE, mConsumer->attachBuffer(NULL, safeToClobberBuffer));
-    ASSERT_EQ(BAD_VALUE, mConsumer->attachBuffer(&newSlot, NULL));
+    ASSERT_EQ(BAD_VALUE, mConsumer->attachBuffer(nullptr, safeToClobberBuffer));
+    ASSERT_EQ(BAD_VALUE, mConsumer->attachBuffer(&newSlot, nullptr));
     ASSERT_EQ(OK, mConsumer->attachBuffer(&newSlot, item.mGraphicBuffer));
 
     ASSERT_EQ(OK, mConsumer->releaseBuffer(newSlot, 0, EGL_NO_DISPLAY,
diff --git a/libs/gui/tests/CpuConsumer_test.cpp b/libs/gui/tests/CpuConsumer_test.cpp
index 36be7d9..00e32d9 100644
--- a/libs/gui/tests/CpuConsumer_test.cpp
+++ b/libs/gui/tests/CpuConsumer_test.cpp
@@ -484,12 +484,12 @@
     err = native_window_dequeue_buffer_and_wait(anw.get(), &anb);
     ASSERT_NO_ERROR(err, "dequeueBuffer error: ");
 
-    ASSERT_TRUE(anb != NULL);
+    ASSERT_TRUE(anb != nullptr);
 
     sp<GraphicBuffer> buf(GraphicBuffer::from(anb));
 
     *stride = buf->getStride();
-    uint8_t* img = NULL;
+    uint8_t* img = nullptr;
 
     ALOGVV("Lock buffer from %p for write", anw.get());
     err = buf->lock(GRALLOC_USAGE_SW_WRITE_OFTEN, (void**)(&img));
@@ -554,7 +554,7 @@
     err = mCC->lockNextBuffer(&b);
     ASSERT_NO_ERROR(err, "getNextBuffer error: ");
 
-    ASSERT_TRUE(b.data != NULL);
+    ASSERT_TRUE(b.data != nullptr);
     EXPECT_EQ(params.width,  b.width);
     EXPECT_EQ(params.height, b.height);
     EXPECT_EQ(params.format, b.format);
@@ -595,7 +595,7 @@
         err = mCC->lockNextBuffer(&b);
         ASSERT_NO_ERROR(err, "getNextBuffer error: ");
 
-        ASSERT_TRUE(b.data != NULL);
+        ASSERT_TRUE(b.data != nullptr);
         EXPECT_EQ(params.width,  b.width);
         EXPECT_EQ(params.height, b.height);
         EXPECT_EQ(params.format, b.format);
@@ -637,7 +637,7 @@
         err = mCC->lockNextBuffer(&b[i]);
         ASSERT_NO_ERROR(err, "getNextBuffer error: ");
 
-        ASSERT_TRUE(b[i].data != NULL);
+        ASSERT_TRUE(b[i].data != nullptr);
         EXPECT_EQ(params.width,  b[i].width);
         EXPECT_EQ(params.height, b[i].height);
         EXPECT_EQ(params.format, b[i].format);
@@ -660,7 +660,7 @@
     err = mCC->lockNextBuffer(&bTooMuch);
     ASSERT_NO_ERROR(err, "Did not allow new lock after unlock");
 
-    ASSERT_TRUE(bTooMuch.data != NULL);
+    ASSERT_TRUE(bTooMuch.data != nullptr);
     EXPECT_EQ(params.width,  bTooMuch.width);
     EXPECT_EQ(params.height, bTooMuch.height);
     EXPECT_EQ(params.format, bTooMuch.format);
diff --git a/libs/gui/tests/FillBuffer.cpp b/libs/gui/tests/FillBuffer.cpp
index ccd674f..b60995a 100644
--- a/libs/gui/tests/FillBuffer.cpp
+++ b/libs/gui/tests/FillBuffer.cpp
@@ -93,11 +93,11 @@
     android_native_buffer_t* anb;
     ASSERT_EQ(NO_ERROR, native_window_dequeue_buffer_and_wait(anw.get(),
             &anb));
-    ASSERT_TRUE(anb != NULL);
+    ASSERT_TRUE(anb != nullptr);
 
     sp<GraphicBuffer> buf(GraphicBuffer::from(anb));
 
-    uint8_t* img = NULL;
+    uint8_t* img = nullptr;
     ASSERT_EQ(NO_ERROR, buf->lock(GRALLOC_USAGE_SW_WRITE_OFTEN,
             (void**)(&img)));
     fillRGBA8Buffer(img, buf->getWidth(), buf->getHeight(), buf->getStride());
diff --git a/libs/gui/tests/GLTest.cpp b/libs/gui/tests/GLTest.cpp
index a91552f..a1405fc 100644
--- a/libs/gui/tests/GLTest.cpp
+++ b/libs/gui/tests/GLTest.cpp
@@ -50,7 +50,7 @@
     ASSERT_EQ(EGL_SUCCESS, eglGetError());
 
     char* displaySecsEnv = getenv("GLTEST_DISPLAY_SECS");
-    if (displaySecsEnv != NULL) {
+    if (displaySecsEnv != nullptr) {
         mDisplaySecs = atoi(displaySecsEnv);
         if (mDisplaySecs < 0) {
             mDisplaySecs = 0;
@@ -67,7 +67,7 @@
                 String8("Test Surface"), getSurfaceWidth(), getSurfaceHeight(),
                 PIXEL_FORMAT_RGB_888, 0);
 
-        ASSERT_TRUE(mSurfaceControl != NULL);
+        ASSERT_TRUE(mSurfaceControl != nullptr);
         ASSERT_TRUE(mSurfaceControl->isValid());
 
         Transaction t;
@@ -117,7 +117,7 @@
         sleep(mDisplaySecs);
     }
 
-    if (mComposerClient != NULL) {
+    if (mComposerClient != nullptr) {
         mComposerClient->dispose();
     }
     if (mEglContext != EGL_NO_CONTEXT) {
@@ -171,7 +171,7 @@
 
 EGLSurface GLTest::createWindowSurface(EGLDisplay display, EGLConfig config,
                                        sp<ANativeWindow>& window) const {
-    return eglCreateWindowSurface(display, config, window.get(), NULL);
+    return eglCreateWindowSurface(display, config, window.get(), nullptr);
 }
 
 ::testing::AssertionResult GLTest::checkPixel(int x, int y,
@@ -256,7 +256,7 @@
     GLuint shader = glCreateShader(shaderType);
     ASSERT_EQ(GLenum(GL_NO_ERROR), glGetError());
     if (shader) {
-        glShaderSource(shader, 1, &pSource, NULL);
+        glShaderSource(shader, 1, &pSource, nullptr);
         ASSERT_EQ(GLenum(GL_NO_ERROR), glGetError());
         glCompileShader(shader);
         ASSERT_EQ(GLenum(GL_NO_ERROR), glGetError());
@@ -270,7 +270,7 @@
             if (infoLen) {
                 char* buf = (char*) malloc(infoLen);
                 if (buf) {
-                    glGetShaderInfoLog(shader, infoLen, NULL, buf);
+                    glGetShaderInfoLog(shader, infoLen, nullptr, buf);
                     printf("Shader compile log:\n%s\n", buf);
                     free(buf);
                     FAIL();
@@ -278,7 +278,7 @@
             } else {
                 char* buf = (char*) malloc(0x1000);
                 if (buf) {
-                    glGetShaderInfoLog(shader, 0x1000, NULL, buf);
+                    glGetShaderInfoLog(shader, 0x1000, nullptr, buf);
                     printf("Shader compile log:\n%s\n", buf);
                     free(buf);
                     FAIL();
@@ -322,7 +322,7 @@
             if (bufLength) {
                 char* buf = (char*) malloc(bufLength);
                 if (buf) {
-                    glGetProgramInfoLog(program, bufLength, NULL, buf);
+                    glGetProgramInfoLog(program, bufLength, nullptr, buf);
                     printf("Program link log:\n%s\n", buf);
                     free(buf);
                     FAIL();
diff --git a/libs/gui/tests/GLTest.h b/libs/gui/tests/GLTest.h
index f0d27a8..f290b3c 100644
--- a/libs/gui/tests/GLTest.h
+++ b/libs/gui/tests/GLTest.h
@@ -39,7 +39,7 @@
             mEglDisplay(EGL_NO_DISPLAY),
             mEglSurface(EGL_NO_SURFACE),
             mEglContext(EGL_NO_CONTEXT),
-            mGlConfig(NULL) {
+            mGlConfig(nullptr) {
     }
 
     virtual void SetUp();
diff --git a/libs/gui/tests/IGraphicBufferProducer_test.cpp b/libs/gui/tests/IGraphicBufferProducer_test.cpp
index c20e8fc..6d03374 100644
--- a/libs/gui/tests/IGraphicBufferProducer_test.cpp
+++ b/libs/gui/tests/IGraphicBufferProducer_test.cpp
@@ -228,9 +228,9 @@
     void setupDequeueRequestBuffer(int *slot, sp<Fence> *fence,
             sp<GraphicBuffer> *buffer)
     {
-        ASSERT_TRUE(slot != NULL);
-        ASSERT_TRUE(fence != NULL);
-        ASSERT_TRUE(buffer != NULL);
+        ASSERT_TRUE(slot != nullptr);
+        ASSERT_TRUE(fence != nullptr);
+        ASSERT_TRUE(buffer != nullptr);
 
         ASSERT_NO_FATAL_FAILURE(ConnectProducer());
 
@@ -263,7 +263,7 @@
     EXPECT_EQ(BAD_VALUE, mProducer->connect(TEST_TOKEN,
                                             TEST_API,
                                             TEST_CONTROLLED_BY_APP,
-                                            /*output*/NULL));
+                                            /*output*/nullptr));
 
     // Invalid API returns bad value
     EXPECT_EQ(BAD_VALUE, mProducer->connect(TEST_TOKEN,
@@ -359,7 +359,7 @@
     // TODO: Consider documented the above enums as unsupported or make a new enum for IGBP
 
     // Value was NULL
-    EXPECT_EQ(BAD_VALUE, mProducer->query(NATIVE_WINDOW_FORMAT, /*value*/NULL));
+    EXPECT_EQ(BAD_VALUE, mProducer->query(NATIVE_WINDOW_FORMAT, /*value*/nullptr));
 
     ASSERT_OK(mConsumer->consumerDisconnect());
 
@@ -465,7 +465,7 @@
 
     // Fence was NULL
     {
-        sp<Fence> nullFence = NULL;
+        sp<Fence> nullFence = nullptr;
 
         IGraphicBufferProducer::QueueBufferInput input =
                 QueueBufferInputBuilder().setFence(nullFence).build();
diff --git a/libs/gui/tests/MultiTextureConsumer_test.cpp b/libs/gui/tests/MultiTextureConsumer_test.cpp
index 3a25ac5..7d3d4aa 100644
--- a/libs/gui/tests/MultiTextureConsumer_test.cpp
+++ b/libs/gui/tests/MultiTextureConsumer_test.cpp
@@ -47,7 +47,7 @@
         GLTest::TearDown();
     }
     virtual EGLint const* getContextAttribs() {
-        return NULL;
+        return nullptr;
     }
     virtual EGLint const* getConfigAttribs() {
         static EGLint sDefaultConfigAttribs[] = {
@@ -105,7 +105,7 @@
 
     glClear(GL_COLOR_BUFFER_BIT);
     for (int i=0 ; i<8 ; i++) {
-        mSurface->lock(&buffer, NULL);
+        mSurface->lock(&buffer, nullptr);
         memset(buffer.bits, (i&7) * 0x20, buffer.stride * buffer.height * 4);
         mSurface->unlockAndPost();
 
diff --git a/libs/gui/tests/SurfaceTextureClient_test.cpp b/libs/gui/tests/SurfaceTextureClient_test.cpp
index d8c9bcf..65e09f2 100644
--- a/libs/gui/tests/SurfaceTextureClient_test.cpp
+++ b/libs/gui/tests/SurfaceTextureClient_test.cpp
@@ -38,7 +38,7 @@
             mEglDisplay(EGL_NO_DISPLAY),
             mEglSurface(EGL_NO_SURFACE),
             mEglContext(EGL_NO_CONTEXT),
-            mEglConfig(NULL) {
+            mEglConfig(nullptr) {
     }
 
     virtual void SetUp() {
@@ -81,7 +81,7 @@
         ASSERT_EQ(EGL_SUCCESS, eglGetError());
         ASSERT_NE(EGL_NO_SURFACE, mEglSurface);
 
-        mEglContext = eglCreateContext(mEglDisplay, myConfig, EGL_NO_CONTEXT, 0);
+        mEglContext = eglCreateContext(mEglDisplay, myConfig, EGL_NO_CONTEXT, nullptr);
         ASSERT_EQ(EGL_SUCCESS, eglGetError());
         ASSERT_NE(EGL_NO_CONTEXT, mEglContext);
 
@@ -126,7 +126,7 @@
 
 TEST_F(SurfaceTextureClientTest, GetISurfaceTextureIsNotNull) {
     sp<IGraphicBufferProducer> ist(mSTC->getIGraphicBufferProducer());
-    ASSERT_TRUE(ist != NULL);
+    ASSERT_TRUE(ist != nullptr);
 }
 
 TEST_F(SurfaceTextureClientTest, QueuesToWindowCompositorIsFalse) {
@@ -154,7 +154,7 @@
     EXPECT_TRUE(eglInitialize(dpy, &majorVersion, &minorVersion));
     ASSERT_EQ(EGL_SUCCESS, eglGetError());
 
-    EGLConfig myConfig = {0};
+    EGLConfig myConfig = {nullptr};
     EGLint numConfigs = 0;
     EGLint configAttribs[] = {
         EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
@@ -171,7 +171,7 @@
     ASSERT_EQ(EGL_SUCCESS, eglGetError());
 
     EGLSurface eglSurface = eglCreateWindowSurface(dpy, myConfig, mANW.get(),
-            NULL);
+            nullptr);
     EXPECT_NE(EGL_NO_SURFACE, eglSurface);
     EXPECT_EQ(EGL_SUCCESS, eglGetError());
 
@@ -184,7 +184,7 @@
 
 TEST_F(SurfaceTextureClientTest, EglSwapBuffersAbandonErrorIsEglBadSurface) {
 
-    EGLSurface eglSurface = eglCreateWindowSurface(mEglDisplay, mEglConfig, mANW.get(), NULL);
+    EGLSurface eglSurface = eglCreateWindowSurface(mEglDisplay, mEglConfig, mANW.get(), nullptr);
     EXPECT_NE(EGL_NO_SURFACE, eglSurface);
     EXPECT_EQ(EGL_SUCCESS, eglGetError());
 
@@ -738,7 +738,7 @@
         ASSERT_EQ(EGL_SUCCESS, eglGetError());
 
         mEglContext = eglCreateContext(mEglDisplay, myConfig, EGL_NO_CONTEXT,
-                0);
+                nullptr);
         ASSERT_EQ(EGL_SUCCESS, eglGetError());
         ASSERT_NE(EGL_NO_CONTEXT, mEglContext);
 
@@ -750,7 +750,7 @@
                     GLConsumer::TEXTURE_EXTERNAL, true, false));
             sp<Surface> stc(new Surface(producer));
             mEglSurfaces[i] = eglCreateWindowSurface(mEglDisplay, myConfig,
-                    static_cast<ANativeWindow*>(stc.get()), NULL);
+                    static_cast<ANativeWindow*>(stc.get()), nullptr);
             ASSERT_EQ(EGL_SUCCESS, eglGetError());
             ASSERT_NE(EGL_NO_SURFACE, mEglSurfaces[i]);
         }
diff --git a/libs/gui/tests/SurfaceTextureFBO.h b/libs/gui/tests/SurfaceTextureFBO.h
index 7f1ae84..70f988d 100644
--- a/libs/gui/tests/SurfaceTextureFBO.h
+++ b/libs/gui/tests/SurfaceTextureFBO.h
@@ -34,7 +34,7 @@
         glGenTextures(1, &mFboTex);
         glBindTexture(GL_TEXTURE_2D, mFboTex);
         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, getSurfaceWidth(),
-                getSurfaceHeight(), 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+                getSurfaceHeight(), 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
         glBindTexture(GL_TEXTURE_2D, 0);
         ASSERT_EQ(GLenum(GL_NO_ERROR), glGetError());
 
diff --git a/libs/gui/tests/SurfaceTextureFBO_test.cpp b/libs/gui/tests/SurfaceTextureFBO_test.cpp
index 0134273..f34561f 100644
--- a/libs/gui/tests/SurfaceTextureFBO_test.cpp
+++ b/libs/gui/tests/SurfaceTextureFBO_test.cpp
@@ -39,12 +39,12 @@
     android_native_buffer_t* anb;
     ASSERT_EQ(NO_ERROR, native_window_dequeue_buffer_and_wait(mANW.get(),
             &anb));
-    ASSERT_TRUE(anb != NULL);
+    ASSERT_TRUE(anb != nullptr);
 
     sp<GraphicBuffer> buf(GraphicBuffer::from(anb));
 
     // Fill the buffer with green
-    uint8_t* img = NULL;
+    uint8_t* img = nullptr;
     buf->lock(GRALLOC_USAGE_SW_WRITE_OFTEN, (void**)(&img));
     fillRGBA8BufferSolid(img, texWidth, texHeight, buf->getStride(), 0, 255,
             0, 255);
@@ -63,7 +63,7 @@
 
         ASSERT_EQ(NO_ERROR, native_window_dequeue_buffer_and_wait(mANW.get(),
                 &anb));
-        ASSERT_TRUE(anb != NULL);
+        ASSERT_TRUE(anb != nullptr);
 
         buf = GraphicBuffer::from(anb);
 
diff --git a/libs/gui/tests/SurfaceTextureGLThreadToGL.h b/libs/gui/tests/SurfaceTextureGLThreadToGL.h
index 2ce20eb..03975b1 100644
--- a/libs/gui/tests/SurfaceTextureGLThreadToGL.h
+++ b/libs/gui/tests/SurfaceTextureGLThreadToGL.h
@@ -158,7 +158,7 @@
     }
 
     virtual void TearDown() {
-        if (mProducerThread != NULL) {
+        if (mProducerThread != nullptr) {
             mProducerThread->requestExitAndWait();
         }
         mProducerThread.clear();
@@ -167,7 +167,7 @@
     }
 
     void runProducerThread(const sp<ProducerThread> producerThread) {
-        ASSERT_TRUE(mProducerThread == NULL);
+        ASSERT_TRUE(mProducerThread == nullptr);
         mProducerThread = producerThread;
         producerThread->setEglObjects(mEglDisplay, mProducerEglSurface,
                 mProducerEglContext);
diff --git a/libs/gui/tests/SurfaceTextureGLToGL.h b/libs/gui/tests/SurfaceTextureGLToGL.h
index 5d43a48..3a87c12 100644
--- a/libs/gui/tests/SurfaceTextureGLToGL.h
+++ b/libs/gui/tests/SurfaceTextureGLToGL.h
@@ -38,7 +38,7 @@
 
     void SetUpWindowAndContext() {
         mProducerEglSurface = eglCreateWindowSurface(mEglDisplay, mGlConfig,
-                mANW.get(), NULL);
+                mANW.get(), nullptr);
         ASSERT_EQ(EGL_SUCCESS, eglGetError());
         ASSERT_NE(EGL_NO_SURFACE, mProducerEglSurface);
 
diff --git a/libs/gui/tests/SurfaceTextureGL_test.cpp b/libs/gui/tests/SurfaceTextureGL_test.cpp
index 5639286..e2b4f3d 100644
--- a/libs/gui/tests/SurfaceTextureGL_test.cpp
+++ b/libs/gui/tests/SurfaceTextureGL_test.cpp
@@ -40,12 +40,12 @@
     ANativeWindowBuffer* anb;
     ASSERT_EQ(NO_ERROR, native_window_dequeue_buffer_and_wait(mANW.get(),
             &anb));
-    ASSERT_TRUE(anb != NULL);
+    ASSERT_TRUE(anb != nullptr);
 
     sp<GraphicBuffer> buf(GraphicBuffer::from(anb));
 
     // Fill the buffer with the a checkerboard pattern
-    uint8_t* img = NULL;
+    uint8_t* img = nullptr;
     buf->lock(GRALLOC_USAGE_SW_WRITE_OFTEN, (void**)(&img));
     fillYV12Buffer(img, texWidth, texHeight, buf->getStride());
     buf->unlock();
@@ -90,12 +90,12 @@
     ANativeWindowBuffer* anb;
     ASSERT_EQ(NO_ERROR, native_window_dequeue_buffer_and_wait(mANW.get(),
             &anb));
-    ASSERT_TRUE(anb != NULL);
+    ASSERT_TRUE(anb != nullptr);
 
     sp<GraphicBuffer> buf(GraphicBuffer::from(anb));
 
     // Fill the buffer with the a checkerboard pattern
-    uint8_t* img = NULL;
+    uint8_t* img = nullptr;
     buf->lock(GRALLOC_USAGE_SW_WRITE_OFTEN, (void**)(&img));
     fillYV12Buffer(img, texWidth, texHeight, buf->getStride());
     buf->unlock();
@@ -155,11 +155,11 @@
         ANativeWindowBuffer* anb;
         ASSERT_EQ(NO_ERROR, native_window_dequeue_buffer_and_wait(mANW.get(),
                 &anb));
-        ASSERT_TRUE(anb != NULL);
+        ASSERT_TRUE(anb != nullptr);
 
         sp<GraphicBuffer> buf(GraphicBuffer::from(anb));
 
-        uint8_t* img = NULL;
+        uint8_t* img = nullptr;
         buf->lock(GRALLOC_USAGE_SW_WRITE_OFTEN, (void**)(&img));
         fillYV12BufferRect(img, texWidth, texHeight, buf->getStride(), crop);
         buf->unlock();
@@ -234,7 +234,7 @@
                         &anb) != NO_ERROR) {
                     return false;
                 }
-                if (anb == NULL) {
+                if (anb == nullptr) {
                     return false;
                 }
 
@@ -248,7 +248,7 @@
                 int yuvTexOffsetU = yuvTexOffsetV + yuvTexStrideV * texHeight/2;
                 int yuvTexStrideU = yuvTexStrideV;
 
-                uint8_t* img = NULL;
+                uint8_t* img = nullptr;
                 buf->lock(GRALLOC_USAGE_SW_WRITE_OFTEN, (void**)(&img));
 
                 // Gray out all the test pixels first, so we're more likely to
@@ -457,7 +457,7 @@
                         &anb) != NO_ERROR) {
                     return false;
                 }
-                if (anb == NULL) {
+                if (anb == nullptr) {
                     return false;
                 }
                 if (mANW->queueBuffer(mANW.get(), anb, -1)
@@ -641,7 +641,7 @@
                     &anb) != NO_ERROR) {
                 return false;
             }
-            if (anb == NULL) {
+            if (anb == nullptr) {
                 return false;
             }
             if (mANW->queueBuffer(mANW.get(), anb, -1)
@@ -654,7 +654,7 @@
                     &anb) != NO_ERROR) {
                 return false;
             }
-            if (anb == NULL) {
+            if (anb == nullptr) {
                 return false;
             }
             if (mANW->queueBuffer(mANW.get(), anb, -1)
diff --git a/libs/gui/tests/Surface_test.cpp b/libs/gui/tests/Surface_test.cpp
index 2c02ba6..3542aba 100644
--- a/libs/gui/tests/Surface_test.cpp
+++ b/libs/gui/tests/Surface_test.cpp
@@ -72,7 +72,7 @@
         mSurfaceControl = mComposerClient->createSurface(
                 String8("Test Surface"), 32, 32, PIXEL_FORMAT_RGBA_8888, 0);
 
-        ASSERT_TRUE(mSurfaceControl != NULL);
+        ASSERT_TRUE(mSurfaceControl != nullptr);
         ASSERT_TRUE(mSurfaceControl->isValid());
 
         Transaction t;
@@ -81,7 +81,7 @@
                 .apply());
 
         mSurface = mSurfaceControl->getSurface();
-        ASSERT_TRUE(mSurface != NULL);
+        ASSERT_TRUE(mSurface != nullptr);
     }
 
     virtual void TearDown() {
@@ -145,7 +145,7 @@
     ASSERT_EQ(NO_ERROR, native_window_set_usage(anw.get(),
             GRALLOC_USAGE_PROTECTED));
     ASSERT_EQ(NO_ERROR, native_window_set_buffer_count(anw.get(), 3));
-    ANativeWindowBuffer* buf = 0;
+    ANativeWindowBuffer* buf = nullptr;
 
     status_t err = native_window_dequeue_buffer_and_wait(anw.get(), &buf);
     if (err) {