diff --git a/graphics/composer/2.1/default/Android.bp b/graphics/composer/2.1/default/Android.bp
index 140e50ece7..b46a1debb3 100644
--- a/graphics/composer/2.1/default/Android.bp
+++ b/graphics/composer/2.1/default/Android.bp
@@ -17,6 +17,9 @@ cc_library_static {
         "libsync",
         "libutils",
     ],
+    header_libs: [
+        "android.hardware.graphics.composer@2.1-command-buffer",
+    ],
 }
 
 cc_library_shared {
@@ -41,6 +44,9 @@ cc_library_shared {
         "libhwc2on1adapter",
         "libhwc2onfbadapter",
     ],
+    header_libs: [
+        "android.hardware.graphics.composer@2.1-command-buffer",
+    ],
 }
 
 cc_binary {
@@ -65,10 +71,3 @@ cc_binary {
         "libutils",
     ],
 }
-
-cc_library_static {
-    name: "libhwcomposer-command-buffer",
-    defaults: ["hidl_defaults"],
-    shared_libs: ["android.hardware.graphics.composer@2.1"],
-    export_include_dirs: ["."],
-}
diff --git a/graphics/composer/2.1/default/ComposerClient.cpp b/graphics/composer/2.1/default/ComposerClient.cpp
index 8aa9af0e97..0fcb9de80e 100644
--- a/graphics/composer/2.1/default/ComposerClient.cpp
+++ b/graphics/composer/2.1/default/ComposerClient.cpp
@@ -19,9 +19,8 @@
 #include <android/hardware/graphics/mapper/2.0/IMapper.h>
 #include <log/log.h>
 
-#include "ComposerClient.h"
 #include "ComposerBase.h"
-#include "IComposerCommandBuffer.h"
+#include "ComposerClient.h"
 
 namespace android {
 namespace hardware {
diff --git a/graphics/composer/2.1/default/ComposerClient.h b/graphics/composer/2.1/default/ComposerClient.h
index fc5c223095..104ed5afcf 100644
--- a/graphics/composer/2.1/default/ComposerClient.h
+++ b/graphics/composer/2.1/default/ComposerClient.h
@@ -21,8 +21,8 @@
 #include <unordered_map>
 #include <vector>
 
+#include <composer-command-buffer/2.1/ComposerCommandBuffer.h>
 #include <hardware/hwcomposer2.h>
-#include "IComposerCommandBuffer.h"
 #include "ComposerBase.h"
 
 namespace android {
diff --git a/graphics/composer/2.1/default/OWNERS b/graphics/composer/2.1/default/OWNERS
index 3aa5fa1ffd..4714be2d08 100644
--- a/graphics/composer/2.1/default/OWNERS
+++ b/graphics/composer/2.1/default/OWNERS
@@ -1,4 +1,5 @@
 # Graphics team
+courtneygo@google.com
 jessehall@google.com
 olv@google.com
 stoza@google.com
diff --git a/graphics/composer/2.1/utils/OWNERS b/graphics/composer/2.1/utils/OWNERS
new file mode 100644
index 0000000000..d515a23148
--- /dev/null
+++ b/graphics/composer/2.1/utils/OWNERS
@@ -0,0 +1,4 @@
+courtneygo@google.com
+jessehall@google.com
+olv@google.com
+stoza@google.com
diff --git a/graphics/composer/2.1/utils/command-buffer/Android.bp b/graphics/composer/2.1/utils/command-buffer/Android.bp
new file mode 100644
index 0000000000..e8d41c2b9f
--- /dev/null
+++ b/graphics/composer/2.1/utils/command-buffer/Android.bp
@@ -0,0 +1,7 @@
+cc_library_headers {
+    name: "android.hardware.graphics.composer@2.1-command-buffer",
+    defaults: ["hidl_defaults"],
+    vendor_available: true,
+    shared_libs: ["android.hardware.graphics.composer@2.1"],
+    export_include_dirs: ["include"],
+}
diff --git a/graphics/composer/2.1/default/IComposerCommandBuffer.h b/graphics/composer/2.1/utils/command-buffer/include/composer-command-buffer/2.1/ComposerCommandBuffer.h
similarity index 69%
rename from graphics/composer/2.1/default/IComposerCommandBuffer.h
rename to graphics/composer/2.1/utils/command-buffer/include/composer-command-buffer/2.1/ComposerCommandBuffer.h
index c752f8a469..df529ec615 100644
--- a/graphics/composer/2.1/default/IComposerCommandBuffer.h
+++ b/graphics/composer/2.1/utils/command-buffer/include/composer-command-buffer/2.1/ComposerCommandBuffer.h
@@ -18,7 +18,7 @@
 #define ANDROID_HARDWARE_GRAPHICS_COMPOSER_COMMAND_BUFFER_H
 
 #ifndef LOG_TAG
-#warn "IComposerCommandBuffer.h included without LOG_TAG"
+#warn "ComposerCommandBuffer.h included without LOG_TAG"
 #endif
 
 #undef LOG_NDEBUG
@@ -33,9 +33,9 @@
 #include <string.h>
 
 #include <android/hardware/graphics/composer/2.1/IComposer.h>
+#include <fmq/MessageQueue.h>
 #include <log/log.h>
 #include <sync/sync.h>
-#include <fmq/MessageQueue.h>
 
 namespace android {
 namespace hardware {
@@ -53,21 +53,15 @@ using CommandQueueType = MessageQueue<uint32_t, kSynchronizedReadWrite>;
 // This class helps build a command queue.  Note that all sizes/lengths are in
 // units of uint32_t's.
 class CommandWriterBase {
-public:
-    CommandWriterBase(uint32_t initialMaxSize)
-        : mDataMaxSize(initialMaxSize)
-    {
+   public:
+    CommandWriterBase(uint32_t initialMaxSize) : mDataMaxSize(initialMaxSize) {
         mData = std::make_unique<uint32_t[]>(mDataMaxSize);
         reset();
     }
 
-    virtual ~CommandWriterBase()
-    {
-        reset();
-    }
+    virtual ~CommandWriterBase() { reset(); }
 
-    void reset()
-    {
+    void reset() {
         mDataWritten = 0;
         mCommandEnd = 0;
 
@@ -82,16 +76,14 @@ public:
         mTemporaryHandles.clear();
     }
 
-    IComposerClient::Command getCommand(uint32_t offset)
-    {
+    IComposerClient::Command getCommand(uint32_t offset) {
         uint32_t val = (offset < mDataWritten) ? mData[offset] : 0;
-        return static_cast<IComposerClient::Command>(val &
-                static_cast<uint32_t>(IComposerClient::Command::OPCODE_MASK));
+        return static_cast<IComposerClient::Command>(
+            val & static_cast<uint32_t>(IComposerClient::Command::OPCODE_MASK));
     }
 
     bool writeQueue(bool* outQueueChanged, uint32_t* outCommandLength,
-            hidl_vec<hidl_handle>* outCommandHandles)
-    {
+                    hidl_vec<hidl_handle>* outCommandHandles) {
         if (mDataWritten == 0) {
             *outQueueChanged = false;
             *outCommandLength = 0;
@@ -126,8 +118,7 @@ public:
             *outQueueChanged = false;
         } else {
             auto newQueue = std::make_unique<CommandQueueType>(mDataMaxSize);
-            if (!newQueue->isValid() ||
-                    !newQueue->write(mData.get(), mDataWritten)) {
+            if (!newQueue->isValid() || !newQueue->write(mData.get(), mDataWritten)) {
                 ALOGE("failed to prepare a new message queue ");
                 return false;
             }
@@ -137,39 +128,32 @@ public:
         }
 
         *outCommandLength = mDataWritten;
-        outCommandHandles->setToExternal(
-                const_cast<hidl_handle*>(mDataHandles.data()),
-                mDataHandles.size());
+        outCommandHandles->setToExternal(const_cast<hidl_handle*>(mDataHandles.data()),
+                                         mDataHandles.size());
 
         return true;
     }
 
-    const MQDescriptorSync<uint32_t>* getMQDescriptor() const
-    {
+    const MQDescriptorSync<uint32_t>* getMQDescriptor() const {
         return (mQueue) ? mQueue->getDesc() : nullptr;
     }
 
     static constexpr uint16_t kSelectDisplayLength = 2;
-    void selectDisplay(Display display)
-    {
-        beginCommand(IComposerClient::Command::SELECT_DISPLAY,
-                kSelectDisplayLength);
+    void selectDisplay(Display display) {
+        beginCommand(IComposerClient::Command::SELECT_DISPLAY, kSelectDisplayLength);
         write64(display);
         endCommand();
     }
 
     static constexpr uint16_t kSelectLayerLength = 2;
-    void selectLayer(Layer layer)
-    {
-        beginCommand(IComposerClient::Command::SELECT_LAYER,
-                kSelectLayerLength);
+    void selectLayer(Layer layer) {
+        beginCommand(IComposerClient::Command::SELECT_LAYER, kSelectLayerLength);
         write64(layer);
         endCommand();
     }
 
     static constexpr uint16_t kSetErrorLength = 2;
-    void setError(uint32_t location, Error error)
-    {
+    void setError(uint32_t location, Error error) {
         beginCommand(IComposerClient::Command::SET_ERROR, kSetErrorLength);
         write(location);
         writeSigned(static_cast<int32_t>(error));
@@ -177,25 +161,23 @@ public:
     }
 
     static constexpr uint32_t kPresentOrValidateDisplayResultLength = 1;
-    void setPresentOrValidateResult(uint32_t  state) {
-       beginCommand(IComposerClient::Command::SET_PRESENT_OR_VALIDATE_DISPLAY_RESULT, kPresentOrValidateDisplayResultLength);
-       write(state);
-       endCommand();
+    void setPresentOrValidateResult(uint32_t state) {
+        beginCommand(IComposerClient::Command::SET_PRESENT_OR_VALIDATE_DISPLAY_RESULT,
+                     kPresentOrValidateDisplayResultLength);
+        write(state);
+        endCommand();
     }
 
     void setChangedCompositionTypes(const std::vector<Layer>& layers,
-            const std::vector<IComposerClient::Composition>& types)
-    {
+                                    const std::vector<IComposerClient::Composition>& types) {
         size_t totalLayers = std::min(layers.size(), types.size());
         size_t currentLayer = 0;
 
         while (currentLayer < totalLayers) {
-            size_t count = std::min(totalLayers - currentLayer,
-                    static_cast<size_t>(kMaxLength) / 3);
+            size_t count =
+                std::min(totalLayers - currentLayer, static_cast<size_t>(kMaxLength) / 3);
 
-            beginCommand(
-                    IComposerClient::Command::SET_CHANGED_COMPOSITION_TYPES,
-                    count * 3);
+            beginCommand(IComposerClient::Command::SET_CHANGED_COMPOSITION_TYPES, count * 3);
             for (size_t i = 0; i < count; i++) {
                 write64(layers[currentLayer + i]);
                 writeSigned(static_cast<int32_t>(types[currentLayer + i]));
@@ -206,20 +188,16 @@ public:
         }
     }
 
-    void setDisplayRequests(uint32_t displayRequestMask,
-            const std::vector<Layer>& layers,
-            const std::vector<uint32_t>& layerRequestMasks)
-    {
-        size_t totalLayers = std::min(layers.size(),
-                layerRequestMasks.size());
+    void setDisplayRequests(uint32_t displayRequestMask, const std::vector<Layer>& layers,
+                            const std::vector<uint32_t>& layerRequestMasks) {
+        size_t totalLayers = std::min(layers.size(), layerRequestMasks.size());
         size_t currentLayer = 0;
 
         while (currentLayer < totalLayers) {
-            size_t count = std::min(totalLayers - currentLayer,
-                    static_cast<size_t>(kMaxLength - 1) / 3);
+            size_t count =
+                std::min(totalLayers - currentLayer, static_cast<size_t>(kMaxLength - 1) / 3);
 
-            beginCommand(IComposerClient::Command::SET_DISPLAY_REQUESTS,
-                    1 + count * 3);
+            beginCommand(IComposerClient::Command::SET_DISPLAY_REQUESTS, 1 + count * 3);
             write(displayRequestMask);
             for (size_t i = 0; i < count; i++) {
                 write64(layers[currentLayer + i]);
@@ -232,26 +210,21 @@ public:
     }
 
     static constexpr uint16_t kSetPresentFenceLength = 1;
-    void setPresentFence(int presentFence)
-    {
-        beginCommand(IComposerClient::Command::SET_PRESENT_FENCE,
-                kSetPresentFenceLength);
+    void setPresentFence(int presentFence) {
+        beginCommand(IComposerClient::Command::SET_PRESENT_FENCE, kSetPresentFenceLength);
         writeFence(presentFence);
         endCommand();
     }
 
-    void setReleaseFences(const std::vector<Layer>& layers,
-            const std::vector<int>& releaseFences)
-    {
+    void setReleaseFences(const std::vector<Layer>& layers, const std::vector<int>& releaseFences) {
         size_t totalLayers = std::min(layers.size(), releaseFences.size());
         size_t currentLayer = 0;
 
         while (currentLayer < totalLayers) {
-            size_t count = std::min(totalLayers - currentLayer,
-                    static_cast<size_t>(kMaxLength) / 3);
+            size_t count =
+                std::min(totalLayers - currentLayer, static_cast<size_t>(kMaxLength) / 3);
 
-            beginCommand(IComposerClient::Command::SET_RELEASE_FENCES,
-                    count * 3);
+            beginCommand(IComposerClient::Command::SET_RELEASE_FENCES, count * 3);
             for (size_t i = 0; i < count; i++) {
                 write64(layers[currentLayer + i]);
                 writeFence(releaseFences[currentLayer + i]);
@@ -263,10 +236,8 @@ public:
     }
 
     static constexpr uint16_t kSetColorTransformLength = 17;
-    void setColorTransform(const float* matrix, ColorTransform hint)
-    {
-        beginCommand(IComposerClient::Command::SET_COLOR_TRANSFORM,
-                kSetColorTransformLength);
+    void setColorTransform(const float* matrix, ColorTransform hint) {
+        beginCommand(IComposerClient::Command::SET_COLOR_TRANSFORM, kSetColorTransformLength);
         for (int i = 0; i < 16; i++) {
             writeFloat(matrix[i]);
         }
@@ -274,10 +245,8 @@ public:
         endCommand();
     }
 
-    void setClientTarget(uint32_t slot, const native_handle_t* target,
-            int acquireFence, Dataspace dataspace,
-            const std::vector<IComposerClient::Rect>& damage)
-    {
+    void setClientTarget(uint32_t slot, const native_handle_t* target, int acquireFence,
+                         Dataspace dataspace, const std::vector<IComposerClient::Rect>& damage) {
         bool doWrite = (damage.size() <= (kMaxLength - 4) / 4);
         size_t length = 4 + ((doWrite) ? damage.size() * 4 : 0);
 
@@ -296,11 +265,8 @@ public:
     }
 
     static constexpr uint16_t kSetOutputBufferLength = 3;
-    void setOutputBuffer(uint32_t slot, const native_handle_t* buffer,
-            int releaseFence)
-    {
-        beginCommand(IComposerClient::Command::SET_OUTPUT_BUFFER,
-                kSetOutputBufferLength);
+    void setOutputBuffer(uint32_t slot, const native_handle_t* buffer, int releaseFence) {
+        beginCommand(IComposerClient::Command::SET_OUTPUT_BUFFER, kSetOutputBufferLength);
         write(slot);
         writeHandle(buffer, true);
         writeFence(releaseFence);
@@ -308,67 +274,53 @@ public:
     }
 
     static constexpr uint16_t kValidateDisplayLength = 0;
-    void validateDisplay()
-    {
-        beginCommand(IComposerClient::Command::VALIDATE_DISPLAY,
-                kValidateDisplayLength);
+    void validateDisplay() {
+        beginCommand(IComposerClient::Command::VALIDATE_DISPLAY, kValidateDisplayLength);
         endCommand();
     }
 
     static constexpr uint16_t kPresentOrValidateDisplayLength = 0;
-    void presentOrvalidateDisplay()
-    {
+    void presentOrvalidateDisplay() {
         beginCommand(IComposerClient::Command::PRESENT_OR_VALIDATE_DISPLAY,
                      kPresentOrValidateDisplayLength);
         endCommand();
     }
 
     static constexpr uint16_t kAcceptDisplayChangesLength = 0;
-    void acceptDisplayChanges()
-    {
-        beginCommand(IComposerClient::Command::ACCEPT_DISPLAY_CHANGES,
-                kAcceptDisplayChangesLength);
+    void acceptDisplayChanges() {
+        beginCommand(IComposerClient::Command::ACCEPT_DISPLAY_CHANGES, kAcceptDisplayChangesLength);
         endCommand();
     }
 
     static constexpr uint16_t kPresentDisplayLength = 0;
-    void presentDisplay()
-    {
-        beginCommand(IComposerClient::Command::PRESENT_DISPLAY,
-                kPresentDisplayLength);
+    void presentDisplay() {
+        beginCommand(IComposerClient::Command::PRESENT_DISPLAY, kPresentDisplayLength);
         endCommand();
     }
 
     static constexpr uint16_t kSetLayerCursorPositionLength = 2;
-    void setLayerCursorPosition(int32_t x, int32_t y)
-    {
+    void setLayerCursorPosition(int32_t x, int32_t y) {
         beginCommand(IComposerClient::Command::SET_LAYER_CURSOR_POSITION,
-                kSetLayerCursorPositionLength);
+                     kSetLayerCursorPositionLength);
         writeSigned(x);
         writeSigned(y);
         endCommand();
     }
 
     static constexpr uint16_t kSetLayerBufferLength = 3;
-    void setLayerBuffer(uint32_t slot, const native_handle_t* buffer,
-            int acquireFence)
-    {
-        beginCommand(IComposerClient::Command::SET_LAYER_BUFFER,
-                kSetLayerBufferLength);
+    void setLayerBuffer(uint32_t slot, const native_handle_t* buffer, int acquireFence) {
+        beginCommand(IComposerClient::Command::SET_LAYER_BUFFER, kSetLayerBufferLength);
         write(slot);
         writeHandle(buffer, true);
         writeFence(acquireFence);
         endCommand();
     }
 
-    void setLayerSurfaceDamage(
-            const std::vector<IComposerClient::Rect>& damage)
-    {
+    void setLayerSurfaceDamage(const std::vector<IComposerClient::Rect>& damage) {
         bool doWrite = (damage.size() <= kMaxLength / 4);
         size_t length = (doWrite) ? damage.size() * 4 : 0;
 
-        beginCommand(IComposerClient::Command::SET_LAYER_SURFACE_DAMAGE,
-                length);
+        beginCommand(IComposerClient::Command::SET_LAYER_SURFACE_DAMAGE, length);
         // When there are too many rectangles in the damage region and doWrite
         // is false, we write no rectangle at all which means the entire
         // layer is damaged.
@@ -379,94 +331,76 @@ public:
     }
 
     static constexpr uint16_t kSetLayerBlendModeLength = 1;
-    void setLayerBlendMode(IComposerClient::BlendMode mode)
-    {
-        beginCommand(IComposerClient::Command::SET_LAYER_BLEND_MODE,
-                kSetLayerBlendModeLength);
+    void setLayerBlendMode(IComposerClient::BlendMode mode) {
+        beginCommand(IComposerClient::Command::SET_LAYER_BLEND_MODE, kSetLayerBlendModeLength);
         writeSigned(static_cast<int32_t>(mode));
         endCommand();
     }
 
     static constexpr uint16_t kSetLayerColorLength = 1;
-    void setLayerColor(IComposerClient::Color color)
-    {
-        beginCommand(IComposerClient::Command::SET_LAYER_COLOR,
-                kSetLayerColorLength);
+    void setLayerColor(IComposerClient::Color color) {
+        beginCommand(IComposerClient::Command::SET_LAYER_COLOR, kSetLayerColorLength);
         writeColor(color);
         endCommand();
     }
 
     static constexpr uint16_t kSetLayerCompositionTypeLength = 1;
-    void setLayerCompositionType(IComposerClient::Composition type)
-    {
+    void setLayerCompositionType(IComposerClient::Composition type) {
         beginCommand(IComposerClient::Command::SET_LAYER_COMPOSITION_TYPE,
-                kSetLayerCompositionTypeLength);
+                     kSetLayerCompositionTypeLength);
         writeSigned(static_cast<int32_t>(type));
         endCommand();
     }
 
     static constexpr uint16_t kSetLayerDataspaceLength = 1;
-    void setLayerDataspace(Dataspace dataspace)
-    {
-        beginCommand(IComposerClient::Command::SET_LAYER_DATASPACE,
-                kSetLayerDataspaceLength);
+    void setLayerDataspace(Dataspace dataspace) {
+        beginCommand(IComposerClient::Command::SET_LAYER_DATASPACE, kSetLayerDataspaceLength);
         writeSigned(static_cast<int32_t>(dataspace));
         endCommand();
     }
 
     static constexpr uint16_t kSetLayerDisplayFrameLength = 4;
-    void setLayerDisplayFrame(const IComposerClient::Rect& frame)
-    {
+    void setLayerDisplayFrame(const IComposerClient::Rect& frame) {
         beginCommand(IComposerClient::Command::SET_LAYER_DISPLAY_FRAME,
-                kSetLayerDisplayFrameLength);
+                     kSetLayerDisplayFrameLength);
         writeRect(frame);
         endCommand();
     }
 
     static constexpr uint16_t kSetLayerPlaneAlphaLength = 1;
-    void setLayerPlaneAlpha(float alpha)
-    {
-        beginCommand(IComposerClient::Command::SET_LAYER_PLANE_ALPHA,
-                kSetLayerPlaneAlphaLength);
+    void setLayerPlaneAlpha(float alpha) {
+        beginCommand(IComposerClient::Command::SET_LAYER_PLANE_ALPHA, kSetLayerPlaneAlphaLength);
         writeFloat(alpha);
         endCommand();
     }
 
     static constexpr uint16_t kSetLayerSidebandStreamLength = 1;
-    void setLayerSidebandStream(const native_handle_t* stream)
-    {
+    void setLayerSidebandStream(const native_handle_t* stream) {
         beginCommand(IComposerClient::Command::SET_LAYER_SIDEBAND_STREAM,
-                kSetLayerSidebandStreamLength);
+                     kSetLayerSidebandStreamLength);
         writeHandle(stream);
         endCommand();
     }
 
     static constexpr uint16_t kSetLayerSourceCropLength = 4;
-    void setLayerSourceCrop(const IComposerClient::FRect& crop)
-    {
-        beginCommand(IComposerClient::Command::SET_LAYER_SOURCE_CROP,
-                kSetLayerSourceCropLength);
+    void setLayerSourceCrop(const IComposerClient::FRect& crop) {
+        beginCommand(IComposerClient::Command::SET_LAYER_SOURCE_CROP, kSetLayerSourceCropLength);
         writeFRect(crop);
         endCommand();
     }
 
     static constexpr uint16_t kSetLayerTransformLength = 1;
-    void setLayerTransform(Transform transform)
-    {
-        beginCommand(IComposerClient::Command::SET_LAYER_TRANSFORM,
-                kSetLayerTransformLength);
+    void setLayerTransform(Transform transform) {
+        beginCommand(IComposerClient::Command::SET_LAYER_TRANSFORM, kSetLayerTransformLength);
         writeSigned(static_cast<int32_t>(transform));
         endCommand();
     }
 
-    void setLayerVisibleRegion(
-            const std::vector<IComposerClient::Rect>& visible)
-    {
+    void setLayerVisibleRegion(const std::vector<IComposerClient::Rect>& visible) {
         bool doWrite = (visible.size() <= kMaxLength / 4);
         size_t length = (doWrite) ? visible.size() * 4 : 0;
 
-        beginCommand(IComposerClient::Command::SET_LAYER_VISIBLE_REGION,
-                length);
+        beginCommand(IComposerClient::Command::SET_LAYER_VISIBLE_REGION, length);
         // When there are too many rectangles in the visible region and
         // doWrite is false, we write no rectangle at all which means the
         // entire layer is visible.
@@ -477,20 +411,16 @@ public:
     }
 
     static constexpr uint16_t kSetLayerZOrderLength = 1;
-    void setLayerZOrder(uint32_t z)
-    {
-        beginCommand(IComposerClient::Command::SET_LAYER_Z_ORDER,
-                kSetLayerZOrderLength);
+    void setLayerZOrder(uint32_t z) {
+        beginCommand(IComposerClient::Command::SET_LAYER_Z_ORDER, kSetLayerZOrderLength);
         write(z);
         endCommand();
     }
 
-protected:
-    void beginCommand(IComposerClient::Command command, uint16_t length)
-    {
+   protected:
+    void beginCommand(IComposerClient::Command command, uint16_t length) {
         if (mCommandEnd) {
-            LOG_FATAL("endCommand was not called before command 0x%x",
-                    command);
+            LOG_FATAL("endCommand was not called before command 0x%x", command);
         }
 
         growData(1 + length);
@@ -499,8 +429,7 @@ protected:
         mCommandEnd = mDataWritten + length;
     }
 
-    void endCommand()
-    {
+    void endCommand() {
         if (!mCommandEnd) {
             LOG_FATAL("beginCommand was not called");
         } else if (mDataWritten > mCommandEnd) {
@@ -516,67 +445,48 @@ protected:
         mCommandEnd = 0;
     }
 
-    void write(uint32_t val)
-    {
-        mData[mDataWritten++] = val;
-    }
+    void write(uint32_t val) { mData[mDataWritten++] = val; }
 
-    void writeSigned(int32_t val)
-    {
-        memcpy(&mData[mDataWritten++], &val, sizeof(val));
-    }
+    void writeSigned(int32_t val) { memcpy(&mData[mDataWritten++], &val, sizeof(val)); }
 
-    void writeFloat(float val)
-    {
-        memcpy(&mData[mDataWritten++], &val, sizeof(val));
-    }
+    void writeFloat(float val) { memcpy(&mData[mDataWritten++], &val, sizeof(val)); }
 
-    void write64(uint64_t val)
-    {
+    void write64(uint64_t val) {
         uint32_t lo = static_cast<uint32_t>(val & 0xffffffff);
         uint32_t hi = static_cast<uint32_t>(val >> 32);
         write(lo);
         write(hi);
     }
 
-    void writeRect(const IComposerClient::Rect& rect)
-    {
+    void writeRect(const IComposerClient::Rect& rect) {
         writeSigned(rect.left);
         writeSigned(rect.top);
         writeSigned(rect.right);
         writeSigned(rect.bottom);
     }
 
-    void writeRegion(const std::vector<IComposerClient::Rect>& region)
-    {
+    void writeRegion(const std::vector<IComposerClient::Rect>& region) {
         for (const auto& rect : region) {
             writeRect(rect);
         }
     }
 
-    void writeFRect(const IComposerClient::FRect& rect)
-    {
+    void writeFRect(const IComposerClient::FRect& rect) {
         writeFloat(rect.left);
         writeFloat(rect.top);
         writeFloat(rect.right);
         writeFloat(rect.bottom);
     }
 
-    void writeColor(const IComposerClient::Color& color)
-    {
-        write((color.r <<  0) |
-              (color.g <<  8) |
-              (color.b << 16) |
-              (color.a << 24));
+    void writeColor(const IComposerClient::Color& color) {
+        write((color.r << 0) | (color.g << 8) | (color.b << 16) | (color.a << 24));
     }
 
     // ownership of handle is not transferred
-    void writeHandle(const native_handle_t* handle, bool useCache)
-    {
+    void writeHandle(const native_handle_t* handle, bool useCache) {
         if (!handle) {
-            writeSigned(static_cast<int32_t>((useCache) ?
-                        IComposerClient::HandleIndex::CACHED :
-                        IComposerClient::HandleIndex::EMPTY));
+            writeSigned(static_cast<int32_t>((useCache) ? IComposerClient::HandleIndex::CACHED
+                                                        : IComposerClient::HandleIndex::EMPTY));
             return;
         }
 
@@ -584,14 +494,10 @@ protected:
         writeSigned(mDataHandles.size() - 1);
     }
 
-    void writeHandle(const native_handle_t* handle)
-    {
-        writeHandle(handle, false);
-    }
+    void writeHandle(const native_handle_t* handle) { writeHandle(handle, false); }
 
     // ownership of fence is transferred
-    void writeFence(int fence)
-    {
+    void writeFence(int fence) {
         native_handle_t* handle = nullptr;
         if (fence >= 0) {
             handle = getTemporaryHandle(1, 0);
@@ -607,8 +513,7 @@ protected:
         writeHandle(handle);
     }
 
-    native_handle_t* getTemporaryHandle(int numFds, int numInts)
-    {
+    native_handle_t* getTemporaryHandle(int numFds, int numInts) {
         native_handle_t* handle = native_handle_create(numFds, numInts);
         if (handle) {
             mTemporaryHandles.push_back(handle);
@@ -616,16 +521,14 @@ protected:
         return handle;
     }
 
-    static constexpr uint16_t kMaxLength =
-        std::numeric_limits<uint16_t>::max();
+    static constexpr uint16_t kMaxLength = std::numeric_limits<uint16_t>::max();
 
-private:
-    void growData(uint32_t grow)
-    {
+   private:
+    void growData(uint32_t grow) {
         uint32_t newWritten = mDataWritten + grow;
         if (newWritten < mDataWritten) {
-            LOG_ALWAYS_FATAL("buffer overflowed; data written %" PRIu32
-                    ", growing by %" PRIu32, mDataWritten, grow);
+            LOG_ALWAYS_FATAL("buffer overflowed; data written %" PRIu32 ", growing by %" PRIu32,
+                             mDataWritten, grow);
         }
 
         if (newWritten <= mDataMaxSize) {
@@ -651,7 +554,7 @@ private:
     uint32_t mCommandEnd;
 
     std::vector<hidl_handle> mDataHandles;
-    std::vector<native_handle_t *> mTemporaryHandles;
+    std::vector<native_handle_t*> mTemporaryHandles;
 
     std::unique_ptr<CommandQueueType> mQueue;
 };
@@ -659,14 +562,10 @@ private:
 // This class helps parse a command queue.  Note that all sizes/lengths are in
 // units of uint32_t's.
 class CommandReaderBase {
-public:
-    CommandReaderBase() : mDataMaxSize(0)
-    {
-        reset();
-    }
+   public:
+    CommandReaderBase() : mDataMaxSize(0) { reset(); }
 
-    bool setMQDescriptor(const MQDescriptorSync<uint32_t>& descriptor)
-    {
+    bool setMQDescriptor(const MQDescriptorSync<uint32_t>& descriptor) {
         mQueue = std::make_unique<CommandQueueType>(descriptor, false);
         if (mQueue->isValid()) {
             return true;
@@ -676,9 +575,7 @@ public:
         }
     }
 
-    bool readQueue(uint32_t commandLength,
-            const hidl_vec<hidl_handle>& commandHandles)
-    {
+    bool readQueue(uint32_t commandLength, const hidl_vec<hidl_handle>& commandHandles) {
         if (!mQueue) {
             return false;
         }
@@ -689,8 +586,7 @@ public:
             mData = std::make_unique<uint32_t[]>(mDataMaxSize);
         }
 
-        if (commandLength > mDataMaxSize ||
-                !mQueue->read(mData.get(), commandLength)) {
+        if (commandLength > mDataMaxSize || !mQueue->read(mData.get(), commandLength)) {
             ALOGE("failed to read commands from message queue");
             return false;
         }
@@ -699,15 +595,13 @@ public:
         mDataRead = 0;
         mCommandBegin = 0;
         mCommandEnd = 0;
-        mDataHandles.setToExternal(
-                const_cast<hidl_handle*>(commandHandles.data()),
-                commandHandles.size());
+        mDataHandles.setToExternal(const_cast<hidl_handle*>(commandHandles.data()),
+                                   commandHandles.size());
 
         return true;
     }
 
-    void reset()
-    {
+    void reset() {
         mDataSize = 0;
         mDataRead = 0;
         mCommandBegin = 0;
@@ -715,15 +609,10 @@ public:
         mDataHandles.setToExternal(nullptr, 0);
     }
 
-protected:
-    bool isEmpty() const
-    {
-        return (mDataRead >= mDataSize);
-    }
+   protected:
+    bool isEmpty() const { return (mDataRead >= mDataSize); }
 
-    bool beginCommand(IComposerClient::Command* outCommand,
-            uint16_t* outLength)
-    {
+    bool beginCommand(IComposerClient::Command* outCommand, uint16_t* outLength) {
         if (mCommandEnd) {
             LOG_FATAL("endCommand was not called for last command");
         }
@@ -734,13 +623,11 @@ protected:
             static_cast<uint32_t>(IComposerClient::Command::LENGTH_MASK);
 
         uint32_t val = read();
-        *outCommand = static_cast<IComposerClient::Command>(
-                val & opcode_mask);
+        *outCommand = static_cast<IComposerClient::Command>(val & opcode_mask);
         *outLength = static_cast<uint16_t>(val & length_mask);
 
         if (mDataRead + *outLength > mDataSize) {
-            ALOGE("command 0x%x has invalid command length %" PRIu16,
-                    *outCommand, *outLength);
+            ALOGE("command 0x%x has invalid command length %" PRIu16, *outCommand, *outLength);
             // undo the read() above
             mDataRead--;
             return false;
@@ -751,8 +638,7 @@ protected:
         return true;
     }
 
-    void endCommand()
-    {
+    void endCommand() {
         if (!mCommandEnd) {
             LOG_FATAL("beginCommand was not called");
         } else if (mDataRead > mCommandEnd) {
@@ -767,83 +653,68 @@ protected:
         mCommandEnd = 0;
     }
 
-    uint32_t getCommandLoc() const
-    {
-        return mCommandBegin;
-    }
+    uint32_t getCommandLoc() const { return mCommandBegin; }
 
-    uint32_t read()
-    {
-        return mData[mDataRead++];
-    }
+    uint32_t read() { return mData[mDataRead++]; }
 
-    int32_t readSigned()
-    {
+    int32_t readSigned() {
         int32_t val;
         memcpy(&val, &mData[mDataRead++], sizeof(val));
         return val;
     }
 
-    float readFloat()
-    {
+    float readFloat() {
         float val;
         memcpy(&val, &mData[mDataRead++], sizeof(val));
         return val;
     }
 
-    uint64_t read64()
-    {
+    uint64_t read64() {
         uint32_t lo = read();
         uint32_t hi = read();
         return (static_cast<uint64_t>(hi) << 32) | lo;
     }
 
-    IComposerClient::Color readColor()
-    {
+    IComposerClient::Color readColor() {
         uint32_t val = read();
         return IComposerClient::Color{
-            static_cast<uint8_t>((val >>  0) & 0xff),
-            static_cast<uint8_t>((val >>  8) & 0xff),
-            static_cast<uint8_t>((val >> 16) & 0xff),
-            static_cast<uint8_t>((val >> 24) & 0xff),
+            static_cast<uint8_t>((val >> 0) & 0xff), static_cast<uint8_t>((val >> 8) & 0xff),
+            static_cast<uint8_t>((val >> 16) & 0xff), static_cast<uint8_t>((val >> 24) & 0xff),
         };
     }
 
     // ownership of handle is not transferred
-    const native_handle_t* readHandle(bool* outUseCache)
-    {
+    const native_handle_t* readHandle(bool* outUseCache) {
         const native_handle_t* handle = nullptr;
 
         int32_t index = readSigned();
         switch (index) {
-        case static_cast<int32_t>(IComposerClient::HandleIndex::EMPTY):
-            *outUseCache = false;
-            break;
-        case static_cast<int32_t>(IComposerClient::HandleIndex::CACHED):
-            *outUseCache = true;
-            break;
-        default:
-            if (static_cast<size_t>(index) < mDataHandles.size()) {
-                handle = mDataHandles[index].getNativeHandle();
-            } else {
-                ALOGE("invalid handle index %zu", static_cast<size_t>(index));
-            }
-            *outUseCache = false;
-            break;
+            case static_cast<int32_t>(IComposerClient::HandleIndex::EMPTY):
+                *outUseCache = false;
+                break;
+            case static_cast<int32_t>(IComposerClient::HandleIndex::CACHED):
+                *outUseCache = true;
+                break;
+            default:
+                if (static_cast<size_t>(index) < mDataHandles.size()) {
+                    handle = mDataHandles[index].getNativeHandle();
+                } else {
+                    ALOGE("invalid handle index %zu", static_cast<size_t>(index));
+                }
+                *outUseCache = false;
+                break;
         }
 
         return handle;
     }
 
-    const native_handle_t* readHandle()
-    {
+    const native_handle_t* readHandle() {
         bool useCache;
         return readHandle(&useCache);
     }
 
     // ownership of fence is transferred
-    int readFence()
-    {
+    int readFence() {
         auto handle = readHandle();
         if (!handle || handle->numFds == 0) {
             return -1;
@@ -864,7 +735,7 @@ protected:
         return fd;
     }
 
-private:
+   private:
     std::unique_ptr<CommandQueueType> mQueue;
     uint32_t mDataMaxSize;
     std::unique_ptr<uint32_t[]> mData;
@@ -879,10 +750,10 @@ private:
     hidl_vec<hidl_handle> mDataHandles;
 };
 
-} // namespace V2_1
-} // namespace composer
-} // namespace graphics
-} // namespace hardware
-} // namespace android
+}  // namespace V2_1
+}  // namespace composer
+}  // namespace graphics
+}  // namespace hardware
+}  // namespace android
 
-#endif // ANDROID_HARDWARE_GRAPHICS_COMPOSER_COMMAND_BUFFER_H
+#endif  // ANDROID_HARDWARE_GRAPHICS_COMPOSER_COMMAND_BUFFER_H
diff --git a/graphics/composer/2.1/vts/functional/Android.bp b/graphics/composer/2.1/vts/functional/Android.bp
index 1ba7c9a1b2..40f18c0067 100644
--- a/graphics/composer/2.1/vts/functional/Android.bp
+++ b/graphics/composer/2.1/vts/functional/Android.bp
@@ -28,9 +28,11 @@ cc_library_static {
         "libsync",
     ],
     static_libs: [
-        "libhwcomposer-command-buffer",
         "VtsHalHidlTargetTestBase",
     ],
+    header_libs: [
+        "android.hardware.graphics.composer@2.1-command-buffer",
+    ],
     cflags: [
         "-Wall",
         "-Wextra",
@@ -58,7 +60,9 @@ cc_test {
         "android.hardware.graphics.mapper@2.0",
         "libVtsHalGraphicsComposerTestUtils",
         "libVtsHalGraphicsMapperTestUtils",
-        "libhwcomposer-command-buffer",
         "libnativehelper",
     ],
+    header_libs: [
+        "android.hardware.graphics.composer@2.1-command-buffer",
+    ],
 }
diff --git a/graphics/composer/2.1/vts/functional/TestCommandReader.h b/graphics/composer/2.1/vts/functional/TestCommandReader.h
index 657a46374d..ae25d2d6d9 100644
--- a/graphics/composer/2.1/vts/functional/TestCommandReader.h
+++ b/graphics/composer/2.1/vts/functional/TestCommandReader.h
@@ -17,7 +17,7 @@
 #ifndef TEST_COMMAND_READER_H
 #define TEST_COMMAND_READER_H
 
-#include <IComposerCommandBuffer.h>
+#include <composer-command-buffer/2.1/ComposerCommandBuffer.h>
 
 namespace android {
 namespace hardware {
diff --git a/graphics/composer/2.1/vts/functional/VtsHalGraphicsComposerTestUtils.h b/graphics/composer/2.1/vts/functional/VtsHalGraphicsComposerTestUtils.h
index 4e69f61b87..29b9de35a7 100644
--- a/graphics/composer/2.1/vts/functional/VtsHalGraphicsComposerTestUtils.h
+++ b/graphics/composer/2.1/vts/functional/VtsHalGraphicsComposerTestUtils.h
@@ -23,8 +23,8 @@
 #include <unordered_set>
 #include <vector>
 
-#include <IComposerCommandBuffer.h>
 #include <android/hardware/graphics/composer/2.1/IComposer.h>
+#include <composer-command-buffer/2.1/ComposerCommandBuffer.h>
 #include <utils/StrongPointer.h>
 
 #include "TestCommandReader.h"