diff --git a/include/ftl/Flags.h b/include/ftl/flags.h
similarity index 89%
rename from include/ftl/Flags.h
rename to include/ftl/flags.h
index db3d9ea..70aaa0e 100644
--- a/include/ftl/Flags.h
+++ b/include/ftl/flags.h
@@ -25,9 +25,9 @@
 #include <string>
 #include <type_traits>
 
-// TODO(b/185536303): Align with FTL style and namespace.
+// TODO(b/185536303): Align with FTL style.
 
-namespace android {
+namespace android::ftl {
 
 /* A class for handling flags defined by an enum or enum class in a type-safe way. */
 template <typename F>
@@ -48,10 +48,10 @@
     // should force them to be explicitly constructed from their underlying types to make full use
     // of the type checker.
     template <typename T = U>
-    constexpr Flags(T t, std::enable_if_t<!ftl::is_scoped_enum_v<F>, T>* = nullptr) : mFlags(t) {}
+    constexpr Flags(T t, std::enable_if_t<!is_scoped_enum_v<F>, T>* = nullptr) : mFlags(t) {}
 
     template <typename T = U>
-    explicit constexpr Flags(T t, std::enable_if_t<ftl::is_scoped_enum_v<F>, T>* = nullptr)
+    explicit constexpr Flags(T t, std::enable_if_t<is_scoped_enum_v<F>, T>* = nullptr)
           : mFlags(t) {}
 
     class Iterator {
@@ -175,7 +175,7 @@
         bool first = true;
         U unstringified = 0;
         for (const F f : *this) {
-            if (const auto flagName = ftl::flag_name(f)) {
+            if (const auto flagName = flag_name(f)) {
                 appendFlag(result, flagName.value(), first);
             } else {
                 unstringified |= static_cast<U>(f);
@@ -183,8 +183,8 @@
         }
 
         if (unstringified != 0) {
-            constexpr auto radix = sizeof(U) == 1 ? ftl::Radix::kBin : ftl::Radix::kHex;
-            appendFlag(result, ftl::to_string(unstringified, radix), first);
+            constexpr auto radix = sizeof(U) == 1 ? Radix::kBin : Radix::kHex;
+            appendFlag(result, to_string(unstringified, radix), first);
         }
 
         if (first) {
@@ -211,15 +211,15 @@
 // as flags. In order to use these, add them via a `using namespace` declaration.
 namespace flag_operators {
 
-template <typename F, typename = std::enable_if_t<ftl::is_scoped_enum_v<F>>>
+template <typename F, typename = std::enable_if_t<is_scoped_enum_v<F>>>
 inline Flags<F> operator~(F f) {
-    return static_cast<F>(~ftl::to_underlying(f));
+    return static_cast<F>(~to_underlying(f));
 }
 
-template <typename F, typename = std::enable_if_t<ftl::is_scoped_enum_v<F>>>
+template <typename F, typename = std::enable_if_t<is_scoped_enum_v<F>>>
 Flags<F> operator|(F lhs, F rhs) {
-    return static_cast<F>(ftl::to_underlying(lhs) | ftl::to_underlying(rhs));
+    return static_cast<F>(to_underlying(lhs) | to_underlying(rhs));
 }
 
 } // namespace flag_operators
-} // namespace android
+} // namespace android::ftl
diff --git a/libs/ftl/Android.bp b/libs/ftl/Android.bp
index ef20196..c010a2e 100644
--- a/libs/ftl/Android.bp
+++ b/libs/ftl/Android.bp
@@ -14,11 +14,11 @@
         address: true,
     },
     srcs: [
-        "Flags_test.cpp",
         "cast_test.cpp",
         "concat_test.cpp",
         "enum_test.cpp",
         "fake_guard_test.cpp",
+        "flags_test.cpp",
         "future_test.cpp",
         "small_map_test.cpp",
         "small_vector_test.cpp",
diff --git a/libs/ftl/Flags_test.cpp b/libs/ftl/flags_test.cpp
similarity index 98%
rename from libs/ftl/Flags_test.cpp
rename to libs/ftl/flags_test.cpp
index d241fa2..eea052b 100644
--- a/libs/ftl/Flags_test.cpp
+++ b/libs/ftl/flags_test.cpp
@@ -14,14 +14,15 @@
  * limitations under the License.
  */
 
+#include <ftl/flags.h>
 #include <gtest/gtest.h>
-#include <ftl/Flags.h>
 
 #include <type_traits>
 
 namespace android::test {
 
-using namespace android::flag_operators;
+using ftl::Flags;
+using namespace ftl::flag_operators;
 
 enum class TestFlags : uint8_t { ONE = 0x1, TWO = 0x2, THREE = 0x4 };
 
diff --git a/libs/gui/LayerState.cpp b/libs/gui/LayerState.cpp
index 304fc17..f7cd5c4 100644
--- a/libs/gui/LayerState.cpp
+++ b/libs/gui/LayerState.cpp
@@ -821,7 +821,7 @@
 status_t BufferData::readFromParcel(const Parcel* input) {
     int32_t tmpInt32;
     SAFE_PARCEL(input->readInt32, &tmpInt32);
-    flags = Flags<BufferDataChange>(tmpInt32);
+    flags = ftl::Flags<BufferDataChange>(tmpInt32);
 
     bool tmpBool = false;
     SAFE_PARCEL(input->readBool, &tmpBool);
diff --git a/libs/gui/WindowInfo.cpp b/libs/gui/WindowInfo.cpp
index 2312a8c..804ce4f 100644
--- a/libs/gui/WindowInfo.cpp
+++ b/libs/gui/WindowInfo.cpp
@@ -14,10 +14,11 @@
  * limitations under the License.
  */
 
-#include <type_traits>
 #define LOG_TAG "WindowInfo"
 #define LOG_NDEBUG 0
 
+#include <type_traits>
+
 #include <binder/Parcel.h>
 #include <gui/WindowInfo.h>
 
@@ -25,8 +26,7 @@
 
 namespace android::gui {
 
-// --- WindowInfo ---
-void WindowInfo::setInputConfig(Flags<InputConfig> config, bool value) {
+void WindowInfo::setInputConfig(ftl::Flags<InputConfig> config, bool value) {
     if (value) {
         inputConfig |= config;
         return;
@@ -182,18 +182,16 @@
         return status;
     }
 
-    layoutParamsFlags = Flags<Flag>(lpFlags);
+    layoutParamsFlags = ftl::Flags<Flag>(lpFlags);
     layoutParamsType = static_cast<Type>(lpType);
     transform.set({dsdx, dtdx, tx, dtdy, dsdy, ty, 0, 0, 1});
     touchOcclusionMode = static_cast<TouchOcclusionMode>(touchOcclusionModeInt);
-    inputConfig = Flags<InputConfig>(inputConfigInt);
+    inputConfig = ftl::Flags<InputConfig>(inputConfigInt);
     touchableRegionCropHandle = touchableRegionCropHandleSp;
 
     return OK;
 }
 
-// --- WindowInfoHandle ---
-
 WindowInfoHandle::WindowInfoHandle() {}
 
 WindowInfoHandle::~WindowInfoHandle() {}
diff --git a/libs/gui/include/gui/ISurfaceComposer.h b/libs/gui/include/gui/ISurfaceComposer.h
index 0a3cc19..b11e674 100644
--- a/libs/gui/include/gui/ISurfaceComposer.h
+++ b/libs/gui/include/gui/ISurfaceComposer.h
@@ -27,7 +27,7 @@
 #include <android/gui/IWindowInfosListener.h>
 #include <binder/IBinder.h>
 #include <binder/IInterface.h>
-#include <ftl/Flags.h>
+#include <ftl/flags.h>
 #include <gui/FrameTimelineInfo.h>
 #include <gui/ITransactionCompletedListener.h>
 #include <gui/SpHash.h>
@@ -126,7 +126,7 @@
         frameRateOverride = 1 << 1,
     };
 
-    using EventRegistrationFlags = Flags<EventRegistration>;
+    using EventRegistrationFlags = ftl::Flags<EventRegistration>;
 
     /*
      * Create a connection with SurfaceFlinger.
diff --git a/libs/gui/include/gui/LayerState.h b/libs/gui/include/gui/LayerState.h
index 4ca8d68..0a9b75a 100644
--- a/libs/gui/include/gui/LayerState.h
+++ b/libs/gui/include/gui/LayerState.h
@@ -29,6 +29,7 @@
 #include <android/gui/DropInputMode.h>
 #include <android/gui/FocusRequest.h>
 
+#include <ftl/flags.h>
 #include <gui/DisplayCaptureArgs.h>
 #include <gui/ISurfaceComposer.h>
 #include <gui/LayerCaptureArgs.h>
@@ -102,7 +103,7 @@
     // was called with.
     sp<IBinder> releaseBufferEndpoint;
 
-    Flags<BufferDataChange> flags;
+    ftl::Flags<BufferDataChange> flags;
 
     client_cache_t cachedBuffer;
 
diff --git a/libs/gui/include/gui/WindowInfo.h b/libs/gui/include/gui/WindowInfo.h
index ef0b98b..0e1d258 100644
--- a/libs/gui/include/gui/WindowInfo.h
+++ b/libs/gui/include/gui/WindowInfo.h
@@ -20,7 +20,7 @@
 #include <android/os/InputConfig.h>
 #include <binder/Parcel.h>
 #include <binder/Parcelable.h>
-#include <ftl/Flags.h>
+#include <ftl/flags.h>
 #include <gui/constants.h>
 #include <ui/Rect.h>
 #include <ui/Region.h>
@@ -224,7 +224,7 @@
     int32_t ownerPid = -1;
     int32_t ownerUid = -1;
     std::string packageName;
-    Flags<InputConfig> inputConfig;
+    ftl::Flags<InputConfig> inputConfig;
     int32_t displayId = ADISPLAY_ID_NONE;
     InputApplicationInfo applicationInfo;
     bool replaceTouchableRegionWithCrop = false;
@@ -232,9 +232,9 @@
 
     // The window's layout params flags and type set by WM.
     Type layoutParamsType = Type::UNKNOWN;
-    Flags<Flag> layoutParamsFlags;
+    ftl::Flags<Flag> layoutParamsFlags;
 
-    void setInputConfig(Flags<InputConfig> config, bool value);
+    void setInputConfig(ftl::Flags<InputConfig> config, bool value);
 
     void addTouchableRegion(const Rect& region);
 
diff --git a/services/inputflinger/reader/EventHub.cpp b/services/inputflinger/reader/EventHub.cpp
index 8bd3899..d6a6bd2 100644
--- a/services/inputflinger/reader/EventHub.cpp
+++ b/services/inputflinger/reader/EventHub.cpp
@@ -60,10 +60,11 @@
 #define INDENT3 "      "
 
 using android::base::StringPrintf;
-using namespace android::flag_operators;
 
 namespace android {
 
+using namespace ftl::flag_operators;
+
 static const char* DEVICE_INPUT_PATH = "/dev/input";
 // v4l2 devices go directly into /dev
 static const char* DEVICE_PATH = "/dev";
@@ -302,7 +303,8 @@
 
 // --- Global Functions ---
 
-Flags<InputDeviceClass> getAbsAxisUsage(int32_t axis, Flags<InputDeviceClass> deviceClasses) {
+ftl::Flags<InputDeviceClass> getAbsAxisUsage(int32_t axis,
+                                             ftl::Flags<InputDeviceClass> deviceClasses) {
     // Touch devices get dibs on touch-related axes.
     if (deviceClasses.test(InputDeviceClass::TOUCH)) {
         switch (axis) {
@@ -765,10 +767,10 @@
     return device != nullptr ? device->identifier : InputDeviceIdentifier();
 }
 
-Flags<InputDeviceClass> EventHub::getDeviceClasses(int32_t deviceId) const {
+ftl::Flags<InputDeviceClass> EventHub::getDeviceClasses(int32_t deviceId) const {
     std::scoped_lock _l(mLock);
     Device* device = getDeviceLocked(deviceId);
-    return device != nullptr ? device->classes : Flags<InputDeviceClass>(0);
+    return device != nullptr ? device->classes : ftl::Flags<InputDeviceClass>(0);
 }
 
 int32_t EventHub::getDeviceControllerNumber(int32_t deviceId) const {
@@ -1909,7 +1911,7 @@
 }
 
 void EventHub::reportDeviceAddedForStatisticsLocked(const InputDeviceIdentifier& identifier,
-                                                    Flags<InputDeviceClass> classes) {
+                                                    ftl::Flags<InputDeviceClass> classes) {
     SHA256_CTX ctx;
     SHA256_Init(&ctx);
     SHA256_Update(&ctx, reinterpret_cast<const uint8_t*>(identifier.uniqueId.c_str()),
@@ -2191,7 +2193,7 @@
     }
 
     // If the device isn't recognized as something we handle, don't monitor it.
-    if (device->classes == Flags<InputDeviceClass>(0)) {
+    if (device->classes == ftl::Flags<InputDeviceClass>(0)) {
         ALOGV("Dropping device: id=%d, path='%s', name='%s'", deviceId, devicePath.c_str(),
               device->identifier.name.c_str());
         return;
diff --git a/services/inputflinger/reader/InputDevice.cpp b/services/inputflinger/reader/InputDevice.cpp
index a050963..ba5083b 100644
--- a/services/inputflinger/reader/InputDevice.cpp
+++ b/services/inputflinger/reader/InputDevice.cpp
@@ -18,9 +18,10 @@
 
 #include "InputDevice.h"
 
-#include <ftl/Flags.h>
 #include <algorithm>
 
+#include <ftl/flags.h>
+
 #include "CursorInputMapper.h"
 #include "ExternalStylusInputMapper.h"
 #include "InputReaderContext.h"
@@ -145,7 +146,7 @@
         return;
     }
     std::unique_ptr<InputDeviceContext> contextPtr(new InputDeviceContext(*this, eventHubId));
-    Flags<InputDeviceClass> classes = contextPtr->getDeviceClasses();
+    ftl::Flags<InputDeviceClass> classes = contextPtr->getDeviceClasses();
     std::vector<std::unique_ptr<InputMapper>> mappers;
 
     // Check if we should skip population
@@ -236,7 +237,7 @@
 void InputDevice::configure(nsecs_t when, const InputReaderConfiguration* config,
                             uint32_t changes) {
     mSources = 0;
-    mClasses = Flags<InputDeviceClass>(0);
+    mClasses = ftl::Flags<InputDeviceClass>(0);
     mControllerNumber = 0;
 
     for_each_subdevice([this](InputDeviceContext& context) {
diff --git a/services/inputflinger/reader/include/EventHub.h b/services/inputflinger/reader/include/EventHub.h
index 18e912d..130c556 100644
--- a/services/inputflinger/reader/include/EventHub.h
+++ b/services/inputflinger/reader/include/EventHub.h
@@ -19,13 +19,12 @@
 
 #include <bitset>
 #include <climits>
+#include <filesystem>
 #include <unordered_map>
 #include <vector>
 
-#include <ftl/Flags.h>
-#include <filesystem>
-
 #include <batteryservice/BatteryService.h>
+#include <ftl/flags.h>
 #include <input/Input.h>
 #include <input/InputDevice.h>
 #include <input/KeyCharacterMap.h>
@@ -189,7 +188,7 @@
     int32_t id;
     std::string name;
     std::optional<int32_t> maxBrightness;
-    Flags<InputLightClass> flags;
+    ftl::Flags<InputLightClass> flags;
     std::array<int32_t, COLOR_NUM> rgbIndex;
     std::filesystem::path path;
 };
@@ -198,7 +197,7 @@
 struct RawBatteryInfo {
     int32_t id;
     std::string name;
-    Flags<InputBatteryClass> flags;
+    ftl::Flags<InputBatteryClass> flags;
     std::filesystem::path path;
 };
 
@@ -206,7 +205,8 @@
  * Gets the class that owns an axis, in cases where multiple classes might claim
  * the same axis for different purposes.
  */
-extern Flags<InputDeviceClass> getAbsAxisUsage(int32_t axis, Flags<InputDeviceClass> deviceClasses);
+extern ftl::Flags<InputDeviceClass> getAbsAxisUsage(int32_t axis,
+                                                    ftl::Flags<InputDeviceClass> deviceClasses);
 
 /*
  * Grand Central Station for events.
@@ -239,7 +239,7 @@
         FIRST_SYNTHETIC_EVENT = DEVICE_ADDED,
     };
 
-    virtual Flags<InputDeviceClass> getDeviceClasses(int32_t deviceId) const = 0;
+    virtual ftl::Flags<InputDeviceClass> getDeviceClasses(int32_t deviceId) const = 0;
 
     virtual InputDeviceIdentifier getDeviceIdentifier(int32_t deviceId) const = 0;
 
@@ -436,7 +436,7 @@
 public:
     EventHub();
 
-    Flags<InputDeviceClass> getDeviceClasses(int32_t deviceId) const override final;
+    ftl::Flags<InputDeviceClass> getDeviceClasses(int32_t deviceId) const override final;
 
     InputDeviceIdentifier getDeviceIdentifier(int32_t deviceId) const override final;
 
@@ -559,7 +559,7 @@
 
         std::unique_ptr<TouchVideoDevice> videoDevice;
 
-        Flags<InputDeviceClass> classes;
+        ftl::Flags<InputDeviceClass> classes;
 
         BitArray<KEY_MAX> keyBitmask;
         BitArray<KEY_MAX> keyState;
@@ -662,7 +662,7 @@
     int32_t getNextControllerNumberLocked(const std::string& name) REQUIRES(mLock);
     void releaseControllerNumberLocked(int32_t num) REQUIRES(mLock);
     void reportDeviceAddedForStatisticsLocked(const InputDeviceIdentifier& identifier,
-                                              Flags<InputDeviceClass> classes) REQUIRES(mLock);
+                                              ftl::Flags<InputDeviceClass> classes) REQUIRES(mLock);
 
     const std::unordered_map<int32_t, RawBatteryInfo>& getBatteryInfoLocked(int32_t deviceId) const
             REQUIRES(mLock);
@@ -725,6 +725,6 @@
     bool mPendingINotify;
 };
 
-}; // namespace android
+} // namespace android
 
 #endif // _RUNTIME_EVENT_HUB_H
diff --git a/services/inputflinger/reader/include/InputDevice.h b/services/inputflinger/reader/include/InputDevice.h
index 694daa9..728020e 100644
--- a/services/inputflinger/reader/include/InputDevice.h
+++ b/services/inputflinger/reader/include/InputDevice.h
@@ -17,12 +17,12 @@
 #ifndef _UI_INPUTREADER_INPUT_DEVICE_H
 #define _UI_INPUTREADER_INPUT_DEVICE_H
 
-#include <ftl/Flags.h>
+#include <ftl/flags.h>
 #include <input/DisplayViewport.h>
 #include <input/InputDevice.h>
 #include <input/PropertyMap.h>
-#include <stdint.h>
 
+#include <cstdint>
 #include <optional>
 #include <unordered_map>
 #include <vector>
@@ -53,7 +53,7 @@
     inline int32_t getGeneration() const { return mGeneration; }
     inline const std::string getName() const { return mIdentifier.name; }
     inline const std::string getDescriptor() { return mIdentifier.descriptor; }
-    inline Flags<InputDeviceClass> getClasses() const { return mClasses; }
+    inline ftl::Flags<InputDeviceClass> getClasses() const { return mClasses; }
     inline uint32_t getSources() const { return mSources; }
     inline bool hasEventHubDevices() const { return !mDevices.empty(); }
 
@@ -160,7 +160,7 @@
     int32_t mControllerNumber;
     InputDeviceIdentifier mIdentifier;
     std::string mAlias;
-    Flags<InputDeviceClass> mClasses;
+    ftl::Flags<InputDeviceClass> mClasses;
 
     // map from eventHubId to device context and mappers
     using MapperVector = std::vector<std::unique_ptr<InputMapper>>;
@@ -250,7 +250,7 @@
     inline int32_t getId() { return mDeviceId; }
     inline int32_t getEventHubId() { return mId; }
 
-    inline Flags<InputDeviceClass> getDeviceClasses() const {
+    inline ftl::Flags<InputDeviceClass> getDeviceClasses() const {
         return mEventHub->getDeviceClasses(mId);
     }
     inline InputDeviceIdentifier getDeviceIdentifier() const {
diff --git a/services/inputflinger/tests/InputDispatcher_test.cpp b/services/inputflinger/tests/InputDispatcher_test.cpp
index bf58705..8641287 100644
--- a/services/inputflinger/tests/InputDispatcher_test.cpp
+++ b/services/inputflinger/tests/InputDispatcher_test.cpp
@@ -39,10 +39,11 @@
 using android::gui::WindowInfoHandle;
 using android::os::InputEventInjectionResult;
 using android::os::InputEventInjectionSync;
-using namespace android::flag_operators;
 
 namespace android::inputdispatcher {
 
+using namespace ftl::flag_operators;
+
 // An arbitrary time value.
 static const nsecs_t ARBITRARY_TIME = 1234;
 
diff --git a/services/inputflinger/tests/InputReader_test.cpp b/services/inputflinger/tests/InputReader_test.cpp
index 9f33d23..8ba501c 100644
--- a/services/inputflinger/tests/InputReader_test.cpp
+++ b/services/inputflinger/tests/InputReader_test.cpp
@@ -14,6 +14,9 @@
  * limitations under the License.
  */
 
+#include <cinttypes>
+#include <memory>
+
 #include <CursorInputMapper.h>
 #include <InputDevice.h>
 #include <InputMapper.h>
@@ -34,18 +37,15 @@
 #include <android-base/thread_annotations.h>
 #include <gtest/gtest.h>
 #include <gui/constants.h>
-#include <inttypes.h>
-#include <math.h>
 
-#include <memory>
-#include <regex>
 #include "input/DisplayViewport.h"
 #include "input/Input.h"
 
 namespace android {
 
+using namespace ftl::flag_operators;
+
 using std::chrono_literals::operator""ms;
-using namespace android::flag_operators;
 
 // Timeout for waiting for an expected event
 static constexpr std::chrono::duration WAIT_TIMEOUT = 100ms;
@@ -429,7 +429,7 @@
 
     struct Device {
         InputDeviceIdentifier identifier;
-        Flags<InputDeviceClass> classes;
+        ftl::Flags<InputDeviceClass> classes;
         PropertyMap configuration;
         KeyedVector<int, RawAbsoluteAxisInfo> absoluteAxes;
         KeyedVector<int, bool> relativeAxes;
@@ -457,7 +457,7 @@
             return OK;
         }
 
-        explicit Device(Flags<InputDeviceClass> classes) : classes(classes), enabled(true) {}
+        explicit Device(ftl::Flags<InputDeviceClass> classes) : classes(classes), enabled(true) {}
     };
 
     std::mutex mLock;
@@ -484,7 +484,8 @@
 
     FakeEventHub() { }
 
-    void addDevice(int32_t deviceId, const std::string& name, Flags<InputDeviceClass> classes) {
+    void addDevice(int32_t deviceId, const std::string& name,
+                   ftl::Flags<InputDeviceClass> classes) {
         Device* device = new Device(classes);
         device->identifier.name = name;
         mDevices.add(deviceId, device);
@@ -695,9 +696,9 @@
         return index >= 0 ? mDevices.valueAt(index) : nullptr;
     }
 
-    Flags<InputDeviceClass> getDeviceClasses(int32_t deviceId) const override {
+    ftl::Flags<InputDeviceClass> getDeviceClasses(int32_t deviceId) const override {
         Device* device = getDevice(deviceId);
-        return device ? device->classes : Flags<InputDeviceClass>(0);
+        return device ? device->classes : ftl::Flags<InputDeviceClass>(0);
     }
 
     InputDeviceIdentifier getDeviceIdentifier(int32_t deviceId) const override {
@@ -1572,8 +1573,8 @@
         mFakePolicy.clear();
     }
 
-    void addDevice(int32_t eventHubId, const std::string& name, Flags<InputDeviceClass> classes,
-                   const PropertyMap* configuration) {
+    void addDevice(int32_t eventHubId, const std::string& name,
+                   ftl::Flags<InputDeviceClass> classes, const PropertyMap* configuration) {
         mFakeEventHub->addDevice(eventHubId, name, classes);
 
         if (configuration) {
@@ -1598,7 +1599,8 @@
 
     FakeInputMapper& addDeviceWithFakeInputMapper(int32_t deviceId, int32_t eventHubId,
                                                   const std::string& name,
-                                                  Flags<InputDeviceClass> classes, uint32_t sources,
+                                                  ftl::Flags<InputDeviceClass> classes,
+                                                  uint32_t sources,
                                                   const PropertyMap* configuration) {
         std::shared_ptr<InputDevice> device = mReader->newDevice(deviceId, name);
         FakeInputMapper& mapper = device->addMapper<FakeInputMapper>(eventHubId, sources);
@@ -1610,7 +1612,7 @@
 
 TEST_F(InputReaderTest, PolicyGetInputDevices) {
     ASSERT_NO_FATAL_FAILURE(addDevice(1, "keyboard", InputDeviceClass::KEYBOARD, nullptr));
-    ASSERT_NO_FATAL_FAILURE(addDevice(2, "ignored", Flags<InputDeviceClass>(0),
+    ASSERT_NO_FATAL_FAILURE(addDevice(2, "ignored", ftl::Flags<InputDeviceClass>(0),
                                       nullptr)); // no classes so device will be ignored
 
     // Should also have received a notification describing the new input devices.
@@ -1672,7 +1674,7 @@
 
 TEST_F(InputReaderTest, WhenEnabledChanges_SendsDeviceResetNotification) {
     constexpr int32_t deviceId = END_RESERVED_ID + 1000;
-    constexpr Flags<InputDeviceClass> deviceClass(InputDeviceClass::KEYBOARD);
+    constexpr ftl::Flags<InputDeviceClass> deviceClass(InputDeviceClass::KEYBOARD);
     constexpr int32_t eventHubId = 1;
     std::shared_ptr<InputDevice> device = mReader->newDevice(deviceId, "fake");
     // Must add at least one mapper or the device will be ignored!
@@ -1709,7 +1711,7 @@
 
 TEST_F(InputReaderTest, GetKeyCodeState_ForwardsRequestsToMappers) {
     constexpr int32_t deviceId = END_RESERVED_ID + 1000;
-    constexpr Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD;
+    constexpr ftl::Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD;
     constexpr int32_t eventHubId = 1;
     FakeInputMapper& mapper =
             addDeviceWithFakeInputMapper(deviceId, eventHubId, "fake", deviceClass,
@@ -1773,7 +1775,7 @@
 
 TEST_F(InputReaderTest, GetScanCodeState_ForwardsRequestsToMappers) {
     constexpr int32_t deviceId = END_RESERVED_ID + 1000;
-    constexpr Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD;
+    constexpr ftl::Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD;
     constexpr int32_t eventHubId = 1;
     FakeInputMapper& mapper =
             addDeviceWithFakeInputMapper(deviceId, eventHubId, "fake", deviceClass,
@@ -1806,7 +1808,7 @@
 
 TEST_F(InputReaderTest, GetSwitchState_ForwardsRequestsToMappers) {
     constexpr int32_t deviceId = END_RESERVED_ID + 1000;
-    constexpr Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD;
+    constexpr ftl::Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD;
     constexpr int32_t eventHubId = 1;
     FakeInputMapper& mapper =
             addDeviceWithFakeInputMapper(deviceId, eventHubId, "fake", deviceClass,
@@ -1839,7 +1841,7 @@
 
 TEST_F(InputReaderTest, MarkSupportedKeyCodes_ForwardsRequestsToMappers) {
     constexpr int32_t deviceId = END_RESERVED_ID + 1000;
-    constexpr Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD;
+    constexpr ftl::Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD;
     constexpr int32_t eventHubId = 1;
     FakeInputMapper& mapper =
             addDeviceWithFakeInputMapper(deviceId, eventHubId, "fake", deviceClass,
@@ -1891,7 +1893,7 @@
 
 TEST_F(InputReaderTest, LoopOnce_ForwardsRawEventsToMappers) {
     constexpr int32_t deviceId = END_RESERVED_ID + 1000;
-    constexpr Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD;
+    constexpr ftl::Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD;
     constexpr nsecs_t when = 0;
     constexpr int32_t eventHubId = 1;
     constexpr nsecs_t readTime = 2;
@@ -1915,7 +1917,7 @@
 
 TEST_F(InputReaderTest, DeviceReset_RandomId) {
     constexpr int32_t deviceId = END_RESERVED_ID + 1000;
-    constexpr Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD;
+    constexpr ftl::Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD;
     constexpr int32_t eventHubId = 1;
     std::shared_ptr<InputDevice> device = mReader->newDevice(deviceId, "fake");
     // Must add at least one mapper or the device will be ignored!
@@ -1948,7 +1950,7 @@
 
 TEST_F(InputReaderTest, DeviceReset_GenerateIdWithInputReaderSource) {
     constexpr int32_t deviceId = 1;
-    constexpr Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD;
+    constexpr ftl::Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD;
     constexpr int32_t eventHubId = 1;
     std::shared_ptr<InputDevice> device = mReader->newDevice(deviceId, "fake");
     // Must add at least one mapper or the device will be ignored!
@@ -1963,7 +1965,7 @@
 
 TEST_F(InputReaderTest, Device_CanDispatchToDisplay) {
     constexpr int32_t deviceId = END_RESERVED_ID + 1000;
-    constexpr Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD;
+    constexpr ftl::Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD;
     constexpr int32_t eventHubId = 1;
     const char* DEVICE_LOCATION = "USB1";
     std::shared_ptr<InputDevice> device = mReader->newDevice(deviceId, "fake", DEVICE_LOCATION);
@@ -2008,7 +2010,7 @@
 
 TEST_F(InputReaderTest, WhenEnabledChanges_AllSubdevicesAreUpdated) {
     constexpr int32_t deviceId = END_RESERVED_ID + 1000;
-    constexpr Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD;
+    constexpr ftl::Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD;
     constexpr int32_t eventHubIds[2] = {END_RESERVED_ID, END_RESERVED_ID + 1};
     std::shared_ptr<InputDevice> device = mReader->newDevice(deviceId, "fake");
     // Must add at least one mapper or the device will be ignored!
@@ -2049,7 +2051,7 @@
 
 TEST_F(InputReaderTest, GetKeyCodeState_ForwardsRequestsToSubdeviceMappers) {
     constexpr int32_t deviceId = END_RESERVED_ID + 1000;
-    constexpr Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD;
+    constexpr ftl::Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD;
     constexpr int32_t eventHubIds[2] = {END_RESERVED_ID, END_RESERVED_ID + 1};
     // Add two subdevices to device
     std::shared_ptr<InputDevice> device = mReader->newDevice(deviceId, "fake");
@@ -2106,7 +2108,8 @@
 
 TEST_F(InputReaderTest, VibratorGetVibratorIds) {
     constexpr int32_t deviceId = END_RESERVED_ID + 1000;
-    Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD | InputDeviceClass::VIBRATOR;
+    ftl::Flags<InputDeviceClass> deviceClass =
+            InputDeviceClass::KEYBOARD | InputDeviceClass::VIBRATOR;
     constexpr int32_t eventHubId = 1;
     const char* DEVICE_LOCATION = "BLUETOOTH";
     std::shared_ptr<InputDevice> device = mReader->newDevice(deviceId, "fake", DEVICE_LOCATION);
@@ -2166,7 +2169,8 @@
 
 TEST_F(InputReaderTest, BatteryGetCapacity) {
     constexpr int32_t deviceId = END_RESERVED_ID + 1000;
-    Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD | InputDeviceClass::BATTERY;
+    ftl::Flags<InputDeviceClass> deviceClass =
+            InputDeviceClass::KEYBOARD | InputDeviceClass::BATTERY;
     constexpr int32_t eventHubId = 1;
     const char* DEVICE_LOCATION = "BLUETOOTH";
     std::shared_ptr<InputDevice> device = mReader->newDevice(deviceId, "fake", DEVICE_LOCATION);
@@ -2182,7 +2186,8 @@
 
 TEST_F(InputReaderTest, BatteryGetStatus) {
     constexpr int32_t deviceId = END_RESERVED_ID + 1000;
-    Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD | InputDeviceClass::BATTERY;
+    ftl::Flags<InputDeviceClass> deviceClass =
+            InputDeviceClass::KEYBOARD | InputDeviceClass::BATTERY;
     constexpr int32_t eventHubId = 1;
     const char* DEVICE_LOCATION = "BLUETOOTH";
     std::shared_ptr<InputDevice> device = mReader->newDevice(deviceId, "fake", DEVICE_LOCATION);
@@ -2198,7 +2203,7 @@
 
 TEST_F(InputReaderTest, LightGetColor) {
     constexpr int32_t deviceId = END_RESERVED_ID + 1000;
-    Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD | InputDeviceClass::LIGHT;
+    ftl::Flags<InputDeviceClass> deviceClass = InputDeviceClass::KEYBOARD | InputDeviceClass::LIGHT;
     constexpr int32_t eventHubId = 1;
     const char* DEVICE_LOCATION = "BLUETOOTH";
     std::shared_ptr<InputDevice> device = mReader->newDevice(deviceId, "fake", DEVICE_LOCATION);
@@ -2625,7 +2630,7 @@
     static const int32_t DEVICE_ID;
     static const int32_t DEVICE_GENERATION;
     static const int32_t DEVICE_CONTROLLER_NUMBER;
-    static const Flags<InputDeviceClass> DEVICE_CLASSES;
+    static const ftl::Flags<InputDeviceClass> DEVICE_CLASSES;
     static const int32_t EVENTHUB_ID;
 
     std::shared_ptr<FakeEventHub> mFakeEventHub;
@@ -2646,7 +2651,7 @@
         mDevice = std::make_shared<InputDevice>(mReader->getContext(), DEVICE_ID, DEVICE_GENERATION,
                                                 identifier);
         mReader->pushNextDevice(mDevice);
-        mFakeEventHub->addDevice(EVENTHUB_ID, DEVICE_NAME, Flags<InputDeviceClass>(0));
+        mFakeEventHub->addDevice(EVENTHUB_ID, DEVICE_NAME, ftl::Flags<InputDeviceClass>(0));
         mReader->loopOnce();
     }
 
@@ -2661,14 +2666,14 @@
 const int32_t InputDeviceTest::DEVICE_ID = END_RESERVED_ID + 1000;
 const int32_t InputDeviceTest::DEVICE_GENERATION = 2;
 const int32_t InputDeviceTest::DEVICE_CONTROLLER_NUMBER = 0;
-const Flags<InputDeviceClass> InputDeviceTest::DEVICE_CLASSES =
+const ftl::Flags<InputDeviceClass> InputDeviceTest::DEVICE_CLASSES =
         InputDeviceClass::KEYBOARD | InputDeviceClass::TOUCH | InputDeviceClass::JOYSTICK;
 const int32_t InputDeviceTest::EVENTHUB_ID = 1;
 
 TEST_F(InputDeviceTest, ImmutableProperties) {
     ASSERT_EQ(DEVICE_ID, mDevice->getId());
     ASSERT_STREQ(DEVICE_NAME, mDevice->getName().c_str());
-    ASSERT_EQ(Flags<InputDeviceClass>(0), mDevice->getClasses());
+    ASSERT_EQ(ftl::Flags<InputDeviceClass>(0), mDevice->getClasses());
 }
 
 TEST_F(InputDeviceTest, WhenDeviceCreated_EnabledIsFalse) {
@@ -2912,7 +2917,7 @@
     static const int32_t DEVICE_ID;
     static const int32_t DEVICE_GENERATION;
     static const int32_t DEVICE_CONTROLLER_NUMBER;
-    static const Flags<InputDeviceClass> DEVICE_CLASSES;
+    static const ftl::Flags<InputDeviceClass> DEVICE_CLASSES;
     static const int32_t EVENTHUB_ID;
 
     std::shared_ptr<FakeEventHub> mFakeEventHub;
@@ -2921,7 +2926,7 @@
     std::unique_ptr<InstrumentedInputReader> mReader;
     std::shared_ptr<InputDevice> mDevice;
 
-    virtual void SetUp(Flags<InputDeviceClass> classes) {
+    virtual void SetUp(ftl::Flags<InputDeviceClass> classes) {
         mFakeEventHub = std::make_unique<FakeEventHub>();
         mFakePolicy = new FakeInputReaderPolicy();
         mFakeListener = std::make_unique<TestInputListener>();
@@ -2953,7 +2958,7 @@
 
     std::shared_ptr<InputDevice> newDevice(int32_t deviceId, const std::string& name,
                                            const std::string& location, int32_t eventHubId,
-                                           Flags<InputDeviceClass> classes) {
+                                           ftl::Flags<InputDeviceClass> classes) {
         InputDeviceIdentifier identifier;
         identifier.name = name;
         identifier.location = location;
@@ -3045,8 +3050,8 @@
 const int32_t InputMapperTest::DEVICE_ID = END_RESERVED_ID + 1000;
 const int32_t InputMapperTest::DEVICE_GENERATION = 2;
 const int32_t InputMapperTest::DEVICE_CONTROLLER_NUMBER = 0;
-const Flags<InputDeviceClass> InputMapperTest::DEVICE_CLASSES =
-        Flags<InputDeviceClass>(0); // not needed for current tests
+const ftl::Flags<InputDeviceClass> InputMapperTest::DEVICE_CLASSES =
+        ftl::Flags<InputDeviceClass>(0); // not needed for current tests
 const int32_t InputMapperTest::EVENTHUB_ID = 1;
 
 // --- SwitchInputMapperTest ---
@@ -3842,7 +3847,7 @@
     constexpr int32_t SECOND_EVENTHUB_ID = EVENTHUB_ID + 1;
     std::shared_ptr<InputDevice> device2 =
             newDevice(SECOND_DEVICE_ID, DEVICE_NAME2, USB2, SECOND_EVENTHUB_ID,
-                      Flags<InputDeviceClass>(0));
+                      ftl::Flags<InputDeviceClass>(0));
 
     mFakeEventHub->addKey(SECOND_EVENTHUB_ID, KEY_UP, 0, AKEYCODE_DPAD_UP, 0);
     mFakeEventHub->addKey(SECOND_EVENTHUB_ID, KEY_RIGHT, 0, AKEYCODE_DPAD_RIGHT, 0);
@@ -3954,7 +3959,7 @@
     constexpr int32_t SECOND_EVENTHUB_ID = EVENTHUB_ID + 1;
     std::shared_ptr<InputDevice> device2 =
             newDevice(SECOND_DEVICE_ID, DEVICE_NAME2, USB2, SECOND_EVENTHUB_ID,
-                      Flags<InputDeviceClass>(0));
+                      ftl::Flags<InputDeviceClass>(0));
     mFakeEventHub->addLed(SECOND_EVENTHUB_ID, LED_CAPSL, true /*initially on*/);
     mFakeEventHub->addLed(SECOND_EVENTHUB_ID, LED_NUML, false /*initially off*/);
     mFakeEventHub->addLed(SECOND_EVENTHUB_ID, LED_SCROLLL, false /*initially off*/);
@@ -8409,7 +8414,7 @@
     constexpr int32_t SECOND_EVENTHUB_ID = EVENTHUB_ID + 1;
     std::shared_ptr<InputDevice> device2 =
             newDevice(SECOND_DEVICE_ID, DEVICE_NAME2, USB2, SECOND_EVENTHUB_ID,
-                      Flags<InputDeviceClass>(0));
+                      ftl::Flags<InputDeviceClass>(0));
 
     mFakeEventHub->addAbsoluteAxis(SECOND_EVENTHUB_ID, ABS_MT_POSITION_X, RAW_X_MIN, RAW_X_MAX,
                                    0 /*flat*/, 0 /*fuzz*/);
@@ -9350,7 +9355,7 @@
     static const int32_t DEVICE_ID;
     static const int32_t DEVICE_GENERATION;
     static const int32_t DEVICE_CONTROLLER_NUMBER;
-    static const Flags<InputDeviceClass> DEVICE_CLASSES;
+    static const ftl::Flags<InputDeviceClass> DEVICE_CLASSES;
     static const int32_t EVENTHUB_ID;
 
     std::shared_ptr<FakeEventHub> mFakeEventHub;
@@ -9359,7 +9364,7 @@
     std::unique_ptr<InstrumentedInputReader> mReader;
     std::shared_ptr<InputDevice> mDevice;
 
-    virtual void SetUp(Flags<InputDeviceClass> classes) {
+    virtual void SetUp(ftl::Flags<InputDeviceClass> classes) {
         mFakeEventHub = std::make_unique<FakeEventHub>();
         mFakePolicy = new FakeInputReaderPolicy();
         mFakeListener = std::make_unique<TestInputListener>();
@@ -9385,7 +9390,7 @@
 
     std::shared_ptr<InputDevice> newDevice(int32_t deviceId, const std::string& name,
                                            const std::string& location, int32_t eventHubId,
-                                           Flags<InputDeviceClass> classes) {
+                                           ftl::Flags<InputDeviceClass> classes) {
         InputDeviceIdentifier identifier;
         identifier.name = name;
         identifier.location = location;
@@ -9411,8 +9416,8 @@
 const int32_t PeripheralControllerTest::DEVICE_ID = END_RESERVED_ID + 1000;
 const int32_t PeripheralControllerTest::DEVICE_GENERATION = 2;
 const int32_t PeripheralControllerTest::DEVICE_CONTROLLER_NUMBER = 0;
-const Flags<InputDeviceClass> PeripheralControllerTest::DEVICE_CLASSES =
-        Flags<InputDeviceClass>(0); // not needed for current tests
+const ftl::Flags<InputDeviceClass> PeripheralControllerTest::DEVICE_CLASSES =
+        ftl::Flags<InputDeviceClass>(0); // not needed for current tests
 const int32_t PeripheralControllerTest::EVENTHUB_ID = 1;
 
 // --- BatteryControllerTest ---
diff --git a/services/surfaceflinger/CompositionEngine/include/compositionengine/impl/planner/LayerState.h b/services/surfaceflinger/CompositionEngine/include/compositionengine/impl/planner/LayerState.h
index cb00e71..29d3366 100644
--- a/services/surfaceflinger/CompositionEngine/include/compositionengine/impl/planner/LayerState.h
+++ b/services/surfaceflinger/CompositionEngine/include/compositionengine/impl/planner/LayerState.h
@@ -16,20 +16,20 @@
 
 #pragma once
 
+#include <string>
+
+#include <aidl/android/hardware/graphics/common/BufferUsage.h>
+#include <aidl/android/hardware/graphics/composer3/Composition.h>
 #include <android-base/strings.h>
+#include <ftl/flags.h>
+#include <math/HashCombine.h>
+
 #include <compositionengine/LayerFE.h>
 #include <compositionengine/LayerFECompositionState.h>
 #include <compositionengine/OutputLayer.h>
 #include <compositionengine/impl/OutputLayerCompositionState.h>
-#include <ftl/Flags.h>
-
-#include <string>
 
 #include "DisplayHardware/Hal.h"
-#include "math/HashCombine.h"
-
-#include <aidl/android/hardware/graphics/common/BufferUsage.h>
-#include <aidl/android/hardware/graphics/composer3/Composition.h>
 
 namespace std {
 template <typename T>
@@ -84,13 +84,13 @@
 public:
     virtual ~StateInterface() = default;
 
-    virtual Flags<LayerStateField> update(const compositionengine::OutputLayer* layer) = 0;
+    virtual ftl::Flags<LayerStateField> update(const compositionengine::OutputLayer* layer) = 0;
 
     virtual size_t getHash() const = 0;
 
     virtual LayerStateField getField() const = 0;
 
-    virtual Flags<LayerStateField> getFieldIfDifferent(const StateInterface* other) const = 0;
+    virtual ftl::Flags<LayerStateField> getFieldIfDifferent(const StateInterface* other) const = 0;
 
     virtual bool equals(const StateInterface* other) const = 0;
 
@@ -152,12 +152,12 @@
     ~OutputLayerState() override = default;
 
     // Returns this member's field flag if it was changed
-    Flags<LayerStateField> update(const compositionengine::OutputLayer* layer) override {
+    ftl::Flags<LayerStateField> update(const compositionengine::OutputLayer* layer) override {
         T newValue = mReader(layer);
         return update(newValue);
     }
 
-    Flags<LayerStateField> update(const T& newValue) {
+    ftl::Flags<LayerStateField> update(const T& newValue) {
         if (!mEquals(mValue, newValue)) {
             mValue = newValue;
             mHash = {};
@@ -176,14 +176,14 @@
         return *mHash;
     }
 
-    Flags<LayerStateField> getFieldIfDifferent(const StateInterface* other) const override {
+    ftl::Flags<LayerStateField> getFieldIfDifferent(const StateInterface* other) const override {
         if (other->getField() != FIELD) {
             return {};
         }
 
         // The early return ensures that this downcast is sound
         const OutputLayerState* otherState = static_cast<const OutputLayerState*>(other);
-        return *this != *otherState ? FIELD : Flags<LayerStateField>{};
+        return *this != *otherState ? FIELD : ftl::Flags<LayerStateField>{};
     }
 
     bool equals(const StateInterface* other) const override {
@@ -215,7 +215,7 @@
     LayerState(compositionengine::OutputLayer* layer);
 
     // Returns which fields were updated
-    Flags<LayerStateField> update(compositionengine::OutputLayer*);
+    ftl::Flags<LayerStateField> update(compositionengine::OutputLayer*);
 
     // Computes a hash for this LayerState.
     // The hash is only computed from NonUniqueFields, and excludes GraphicBuffers since they are
@@ -224,7 +224,7 @@
 
     // Returns the bit-set of differing fields between this LayerState and another LayerState.
     // This bit-set is based on NonUniqueFields only, and excludes GraphicBuffers.
-    Flags<LayerStateField> getDifferingFields(const LayerState& other) const;
+    ftl::Flags<LayerStateField> getDifferingFields(const LayerState& other) const;
 
     compositionengine::OutputLayer* getOutputLayer() const { return mOutputLayer; }
     int32_t getId() const { return mId.get(); }
diff --git a/services/surfaceflinger/CompositionEngine/include/compositionengine/impl/planner/Predictor.h b/services/surfaceflinger/CompositionEngine/include/compositionengine/impl/planner/Predictor.h
index ef1560e..6be6735 100644
--- a/services/surfaceflinger/CompositionEngine/include/compositionengine/impl/planner/Predictor.h
+++ b/services/surfaceflinger/CompositionEngine/include/compositionengine/impl/planner/Predictor.h
@@ -16,6 +16,8 @@
 
 #pragma once
 
+#include <ftl/flags.h>
+
 #include <compositionengine/impl/planner/LayerState.h>
 
 namespace android::compositionengine::impl::planner {
@@ -35,7 +37,7 @@
         // This implies that only one layer is allowed to differ in an approximate match.
         size_t differingIndex;
         // Set of fields that differ for the differing layer in the approximate match.
-        Flags<LayerStateField> differingFields;
+        ftl::Flags<LayerStateField> differingFields;
     };
 
     // Returns an approximate match when comparing this layer stack with the provided list of
diff --git a/services/surfaceflinger/CompositionEngine/src/planner/LayerState.cpp b/services/surfaceflinger/CompositionEngine/src/planner/LayerState.cpp
index c79ca0d..f439caf 100644
--- a/services/surfaceflinger/CompositionEngine/src/planner/LayerState.cpp
+++ b/services/surfaceflinger/CompositionEngine/src/planner/LayerState.cpp
@@ -41,7 +41,7 @@
     update(layer);
 }
 
-Flags<LayerStateField> LayerState::update(compositionengine::OutputLayer* layer) {
+ftl::Flags<LayerStateField> LayerState::update(compositionengine::OutputLayer* layer) {
     ALOGE_IF(mOutputLayer != layer && layer->getLayerFE().getSequence() != mId.get(),
              "[%s] Expected mOutputLayer ID to never change: %d, %d", __func__,
              layer->getLayerFE().getSequence(), mId.get());
@@ -50,7 +50,7 @@
     // same, i.e., the LayerFE is the same. An example use-case is screen rotation.
     mOutputLayer = layer;
 
-    Flags<LayerStateField> differences;
+    ftl::Flags<LayerStateField> differences;
 
     // Update the unique fields as well, since we have to set them at least
     // once from the OutputLayer
@@ -76,8 +76,8 @@
     return hash;
 }
 
-Flags<LayerStateField> LayerState::getDifferingFields(const LayerState& other) const {
-    Flags<LayerStateField> differences;
+ftl::Flags<LayerStateField> LayerState::getDifferingFields(const LayerState& other) const {
+    ftl::Flags<LayerStateField> differences;
     auto myFields = getNonUniqueFields();
     auto otherFields = other.getNonUniqueFields();
     for (size_t i = 0; i < myFields.size(); ++i) {
diff --git a/services/surfaceflinger/CompositionEngine/src/planner/Planner.cpp b/services/surfaceflinger/CompositionEngine/src/planner/Planner.cpp
index 74d2701..c8413eb 100644
--- a/services/surfaceflinger/CompositionEngine/src/planner/Planner.cpp
+++ b/services/surfaceflinger/CompositionEngine/src/planner/Planner.cpp
@@ -97,7 +97,7 @@
         if (const auto layerEntry = mPreviousLayers.find(id); layerEntry != mPreviousLayers.end()) {
             // Track changes from previous info
             LayerState& state = layerEntry->second;
-            Flags<LayerStateField> differences = state.update(layer);
+            ftl::Flags<LayerStateField> differences = state.update(layer);
             if (differences.get() == 0) {
                 state.incrementFramesSinceBufferUpdate();
             } else {
diff --git a/services/surfaceflinger/CompositionEngine/src/planner/Predictor.cpp b/services/surfaceflinger/CompositionEngine/src/planner/Predictor.cpp
index 2d53583..2fc029f 100644
--- a/services/surfaceflinger/CompositionEngine/src/planner/Predictor.cpp
+++ b/services/surfaceflinger/CompositionEngine/src/planner/Predictor.cpp
@@ -57,7 +57,7 @@
             return std::nullopt;
         }
 
-        Flags<LayerStateField> differingFields = mLayers[i].getDifferingFields(*other[i]);
+        ftl::Flags<LayerStateField> differingFields = mLayers[i].getDifferingFields(*other[i]);
 
         // If we don't find an approximate match on this layer, then the LayerStacks differ
         // by too much, so return nothing
diff --git a/services/surfaceflinger/CompositionEngine/tests/planner/LayerStateTest.cpp b/services/surfaceflinger/CompositionEngine/tests/planner/LayerStateTest.cpp
index bd4ff13..5c6e8da 100644
--- a/services/surfaceflinger/CompositionEngine/tests/planner/LayerStateTest.cpp
+++ b/services/surfaceflinger/CompositionEngine/tests/planner/LayerStateTest.cpp
@@ -97,12 +97,12 @@
     void verifyUniqueDifferingFields(const LayerState& lhs, const LayerState& rhs) {
         EXPECT_EQ(lhs.getHash(), rhs.getHash());
 
-        EXPECT_EQ(Flags<LayerStateField>(LayerStateField::None), lhs.getDifferingFields(rhs));
-        EXPECT_EQ(Flags<LayerStateField>(LayerStateField::None), rhs.getDifferingFields(lhs));
+        EXPECT_EQ(ftl::Flags<LayerStateField>(LayerStateField::None), lhs.getDifferingFields(rhs));
+        EXPECT_EQ(ftl::Flags<LayerStateField>(LayerStateField::None), rhs.getDifferingFields(lhs));
     }
 
     void verifyNonUniqueDifferingFields(const LayerState& lhs, const LayerState& rhs,
-                                        Flags<LayerStateField> fields) {
+                                        ftl::Flags<LayerStateField> fields) {
         EXPECT_NE(lhs.getHash(), rhs.getHash());
 
         EXPECT_EQ(fields, lhs.getDifferingFields(rhs));
@@ -159,9 +159,9 @@
     sp<mock::LayerFE> newLayerFE = sp<mock::LayerFE>::make();
     setupMocksForLayer(newOutputLayer, *newLayerFE, outputLayerCompositionState,
                        layerFECompositionState, sSequenceIdTwo);
-    Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
+    ftl::Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
     EXPECT_EQ(sSequenceIdTwo, mLayerState->getId());
-    EXPECT_EQ(Flags<LayerStateField>(LayerStateField::Id), updates);
+    EXPECT_EQ(ftl::Flags<LayerStateField>(LayerStateField::Id), updates);
 }
 
 TEST_F(LayerStateTest, compareId) {
@@ -204,9 +204,9 @@
     sp<mock::LayerFE> newLayerFE = sp<mock::LayerFE>::make();
     setupMocksForLayer(newOutputLayer, *newLayerFE, outputLayerCompositionState,
                        layerFECompositionState, sSequenceId, sDebugNameTwo);
-    Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
+    ftl::Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
     EXPECT_EQ(sDebugNameTwo, mLayerState->getName());
-    EXPECT_EQ(Flags<LayerStateField>(LayerStateField::Name), updates);
+    EXPECT_EQ(ftl::Flags<LayerStateField>(LayerStateField::Name), updates);
 }
 
 TEST_F(LayerStateTest, compareName) {
@@ -253,9 +253,9 @@
     outputLayerCompositionStateTwo.displayFrame = sRectTwo;
     setupMocksForLayer(newOutputLayer, *newLayerFE, outputLayerCompositionStateTwo,
                        layerFECompositionState);
-    Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
+    ftl::Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
     EXPECT_EQ(sRectTwo, mLayerState->getDisplayFrame());
-    EXPECT_EQ(Flags<LayerStateField>(LayerStateField::DisplayFrame), updates);
+    EXPECT_EQ(ftl::Flags<LayerStateField>(LayerStateField::DisplayFrame), updates);
 }
 
 TEST_F(LayerStateTest, compareDisplayFrame) {
@@ -315,9 +315,9 @@
     layerFECompositionStateTwo.compositionType = Composition::SOLID_COLOR;
     setupMocksForLayer(newOutputLayer, *newLayerFE, outputLayerCompositionState,
                        layerFECompositionStateTwo);
-    Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
+    ftl::Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
     EXPECT_EQ(Composition::SOLID_COLOR, mLayerState->getCompositionType());
-    EXPECT_EQ(Flags<LayerStateField>(LayerStateField::CompositionType), updates);
+    EXPECT_EQ(ftl::Flags<LayerStateField>(LayerStateField::CompositionType), updates);
 }
 
 TEST_F(LayerStateTest, compareCompositionType) {
@@ -357,8 +357,8 @@
     layerFECompositionStateTwo.buffer = new GraphicBuffer();
     setupMocksForLayer(newOutputLayer, *newLayerFE, outputLayerCompositionState,
                        layerFECompositionStateTwo);
-    Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
-    EXPECT_EQ(Flags<LayerStateField>(LayerStateField::Buffer), updates);
+    ftl::Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
+    EXPECT_EQ(ftl::Flags<LayerStateField>(LayerStateField::Buffer), updates);
 }
 
 TEST_F(LayerStateTest, updateBufferSingleBufferedLegacy) {
@@ -380,8 +380,8 @@
         layerFECompositionStateTwo.frameNumber = i;
         setupMocksForLayer(newOutputLayer, *newLayerFE, outputLayerCompositionState,
                            layerFECompositionStateTwo);
-        Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
-        EXPECT_EQ(Flags<LayerStateField>(LayerStateField::Buffer), updates);
+        ftl::Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
+        EXPECT_EQ(ftl::Flags<LayerStateField>(LayerStateField::Buffer), updates);
     }
 }
 
@@ -404,8 +404,8 @@
     for (uint64_t i = 0; i < 10; i++) {
         setupMocksForLayer(newOutputLayer, *newLayerFE, outputLayerCompositionState,
                            layerFECompositionStateTwo);
-        Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
-        EXPECT_EQ(Flags<LayerStateField>(LayerStateField::Buffer), updates);
+        ftl::Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
+        EXPECT_EQ(ftl::Flags<LayerStateField>(LayerStateField::Buffer), updates);
     }
 }
 
@@ -446,8 +446,8 @@
     outputLayerCompositionStateTwo.sourceCrop = sFloatRectTwo;
     setupMocksForLayer(newOutputLayer, *newLayerFE, outputLayerCompositionStateTwo,
                        layerFECompositionState);
-    Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
-    EXPECT_EQ(Flags<LayerStateField>(LayerStateField::SourceCrop), updates);
+    ftl::Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
+    EXPECT_EQ(ftl::Flags<LayerStateField>(LayerStateField::SourceCrop), updates);
 }
 
 TEST_F(LayerStateTest, compareSourceCrop) {
@@ -485,8 +485,8 @@
     outputLayerCompositionStateTwo.bufferTransform = Hwc2::Transform::FLIP_V;
     setupMocksForLayer(newOutputLayer, *newLayerFE, outputLayerCompositionStateTwo,
                        layerFECompositionState);
-    Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
-    EXPECT_EQ(Flags<LayerStateField>(LayerStateField::BufferTransform), updates);
+    ftl::Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
+    EXPECT_EQ(ftl::Flags<LayerStateField>(LayerStateField::BufferTransform), updates);
 }
 
 TEST_F(LayerStateTest, compareBufferTransform) {
@@ -525,8 +525,8 @@
     layerFECompositionStateTwo.blendMode = hal::BlendMode::PREMULTIPLIED;
     setupMocksForLayer(newOutputLayer, *newLayerFE, outputLayerCompositionState,
                        layerFECompositionStateTwo);
-    Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
-    EXPECT_EQ(Flags<LayerStateField>(LayerStateField::BlendMode), updates);
+    ftl::Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
+    EXPECT_EQ(ftl::Flags<LayerStateField>(LayerStateField::BlendMode), updates);
 }
 
 TEST_F(LayerStateTest, compareBlendMode) {
@@ -564,8 +564,8 @@
     layerFECompositionStateTwo.alpha = sAlphaTwo;
     setupMocksForLayer(newOutputLayer, *newLayerFE, outputLayerCompositionState,
                        layerFECompositionStateTwo);
-    Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
-    EXPECT_EQ(Flags<LayerStateField>(LayerStateField::Alpha), updates);
+    ftl::Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
+    EXPECT_EQ(ftl::Flags<LayerStateField>(LayerStateField::Alpha), updates);
 }
 
 TEST_F(LayerStateTest, compareAlpha) {
@@ -603,8 +603,8 @@
     layerFECompositionStateTwo.metadata[sMetadataKeyTwo] = sMetadataValueTwo;
     setupMocksForLayer(newOutputLayer, *newLayerFE, outputLayerCompositionState,
                        layerFECompositionStateTwo);
-    Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
-    EXPECT_EQ(Flags<LayerStateField>(LayerStateField::LayerMetadata), updates);
+    ftl::Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
+    EXPECT_EQ(ftl::Flags<LayerStateField>(LayerStateField::LayerMetadata), updates);
 }
 
 TEST_F(LayerStateTest, compareLayerMetadata) {
@@ -652,8 +652,8 @@
     outputLayerCompositionStateTwo.visibleRegion = sRegionTwo;
     setupMocksForLayer(newOutputLayer, *newLayerFE, outputLayerCompositionStateTwo,
                        layerFECompositionState);
-    Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
-    EXPECT_EQ(Flags<LayerStateField>(LayerStateField::VisibleRegion), updates);
+    ftl::Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
+    EXPECT_EQ(ftl::Flags<LayerStateField>(LayerStateField::VisibleRegion), updates);
 }
 
 TEST_F(LayerStateTest, compareVisibleRegion) {
@@ -691,8 +691,8 @@
     outputLayerCompositionStateTwo.dataspace = ui::Dataspace::DISPLAY_P3;
     setupMocksForLayer(newOutputLayer, *newLayerFE, outputLayerCompositionStateTwo,
                        layerFECompositionState);
-    Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
-    EXPECT_EQ(Flags<LayerStateField>(LayerStateField::Dataspace), updates);
+    ftl::Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
+    EXPECT_EQ(ftl::Flags<LayerStateField>(LayerStateField::Dataspace), updates);
 }
 
 TEST_F(LayerStateTest, compareDataspace) {
@@ -738,9 +738,9 @@
                               "buffer2");
     setupMocksForLayer(newOutputLayer, *newLayerFE, outputLayerCompositionState,
                        layerFECompositionStateTwo);
-    Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
-    EXPECT_EQ(Flags<LayerStateField>(LayerStateField::Buffer) |
-                      Flags<LayerStateField>(LayerStateField::PixelFormat),
+    ftl::Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
+    EXPECT_EQ(ftl::Flags<LayerStateField>(LayerStateField::Buffer) |
+                      ftl::Flags<LayerStateField>(LayerStateField::PixelFormat),
               updates);
 }
 
@@ -768,7 +768,7 @@
     auto otherLayerState = std::make_unique<LayerState>(&newOutputLayer);
 
     verifyNonUniqueDifferingFields(*mLayerState, *otherLayerState,
-                                   Flags<LayerStateField>(LayerStateField::PixelFormat));
+                                   ftl::Flags<LayerStateField>(LayerStateField::PixelFormat));
 
     EXPECT_TRUE(mLayerState->compare(*otherLayerState));
     EXPECT_TRUE(otherLayerState->compare(*mLayerState));
@@ -790,8 +790,8 @@
     layerFECompositionStateTwo.colorTransform = sMat4One;
     setupMocksForLayer(newOutputLayer, *newLayerFE, outputLayerCompositionState,
                        layerFECompositionStateTwo);
-    Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
-    EXPECT_EQ(Flags<LayerStateField>(LayerStateField::ColorTransform), updates);
+    ftl::Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
+    EXPECT_EQ(ftl::Flags<LayerStateField>(LayerStateField::ColorTransform), updates);
 }
 
 TEST_F(LayerStateTest, compareColorTransform) {
@@ -831,8 +831,8 @@
     layerFECompositionStateTwo.sidebandStream = NativeHandle::create(sFakeSidebandStreamTwo, false);
     setupMocksForLayer(newOutputLayer, *newLayerFE, outputLayerCompositionState,
                        layerFECompositionStateTwo);
-    Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
-    EXPECT_EQ(Flags<LayerStateField>(LayerStateField::SidebandStream), updates);
+    ftl::Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
+    EXPECT_EQ(ftl::Flags<LayerStateField>(LayerStateField::SidebandStream), updates);
 }
 
 TEST_F(LayerStateTest, compareSidebandStream) {
@@ -870,8 +870,8 @@
     layerFECompositionStateTwo.color = sHalf4Two;
     setupMocksForLayer(newOutputLayer, *newLayerFE, outputLayerCompositionState,
                        layerFECompositionStateTwo);
-    Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
-    EXPECT_EQ(Flags<LayerStateField>(LayerStateField::SolidColor), updates);
+    ftl::Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
+    EXPECT_EQ(ftl::Flags<LayerStateField>(LayerStateField::SolidColor), updates);
 }
 
 TEST_F(LayerStateTest, compareSolidColor) {
@@ -909,8 +909,8 @@
     layerFECompositionStateTwo.backgroundBlurRadius = sBgBlurRadiusTwo;
     setupMocksForLayer(newOutputLayer, *newLayerFE, outputLayerCompositionState,
                        layerFECompositionStateTwo);
-    Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
-    EXPECT_EQ(Flags<LayerStateField>(LayerStateField::BackgroundBlurRadius), updates);
+    ftl::Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
+    EXPECT_EQ(ftl::Flags<LayerStateField>(LayerStateField::BackgroundBlurRadius), updates);
 }
 
 TEST_F(LayerStateTest, compareBackgroundBlur) {
@@ -949,8 +949,8 @@
     layerFECompositionStateTwo.blurRegions.push_back(sBlurRegionTwo);
     setupMocksForLayer(newOutputLayer, *newLayerFE, outputLayerCompositionState,
                        layerFECompositionStateTwo);
-    Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
-    EXPECT_EQ(Flags<LayerStateField>(LayerStateField::BlurRegions), updates);
+    ftl::Flags<LayerStateField> updates = mLayerState->update(&newOutputLayer);
+    EXPECT_EQ(ftl::Flags<LayerStateField>(LayerStateField::BlurRegions), updates);
 }
 
 TEST_F(LayerStateTest, compareBlurRegions) {
diff --git a/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.cpp b/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.cpp
index b4fb51f..3803a78 100644
--- a/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.cpp
+++ b/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.cpp
@@ -19,20 +19,20 @@
 #pragma clang diagnostic ignored "-Wconversion"
 
 // #define LOG_NDEBUG 0
-#include "VirtualDisplaySurface.h"
 
 #include <cinttypes>
 
-#include "HWComposer.h"
-#include "SurfaceFlinger.h"
-
-#include <ftl/Flags.h>
 #include <ftl/enum.h>
+#include <ftl/flags.h>
 #include <gui/BufferItem.h>
 #include <gui/BufferQueue.h>
 #include <gui/IProducerListener.h>
 #include <system/window.h>
 
+#include "HWComposer.h"
+#include "SurfaceFlinger.h"
+#include "VirtualDisplaySurface.h"
+
 #define VDS_LOGE(msg, ...) ALOGE("[%s] " msg, \
         mDisplayName.c_str(), ##__VA_ARGS__)
 #define VDS_LOGW_IF(cond, msg, ...) ALOGW_IF(cond, "[%s] " msg, \
@@ -657,7 +657,7 @@
 
 std::string VirtualDisplaySurface::toString(CompositionType type) {
     using namespace std::literals;
-    return type == CompositionType::Unknown ? "Unknown"s : Flags(type).string();
+    return type == CompositionType::Unknown ? "Unknown"s : ftl::Flags(type).string();
 }
 
 } // namespace android
diff --git a/services/surfaceflinger/Layer.cpp b/services/surfaceflinger/Layer.cpp
index 3d00b90..997b1a1 100644
--- a/services/surfaceflinger/Layer.cpp
+++ b/services/surfaceflinger/Layer.cpp
@@ -82,11 +82,13 @@
 constexpr int kDumpTableRowLength = 159;
 } // namespace
 
+using namespace ftl::flag_operators;
+
 using base::StringAppendF;
-using namespace android::flag_operators;
-using PresentState = frametimeline::SurfaceFrame::PresentState;
 using gui::WindowInfo;
 
+using PresentState = frametimeline::SurfaceFrame::PresentState;
+
 std::atomic<int32_t> Layer::sSequence{1};
 
 Layer::Layer(const LayerCreationArgs& args)
diff --git a/services/surfaceflinger/Scheduler/include/scheduler/Features.h b/services/surfaceflinger/Scheduler/include/scheduler/Features.h
index 0e96678..b3a6a60 100644
--- a/services/surfaceflinger/Scheduler/include/scheduler/Features.h
+++ b/services/surfaceflinger/Scheduler/include/scheduler/Features.h
@@ -16,10 +16,10 @@
 
 #pragma once
 
-#include <ftl/Flags.h>
-
 #include <cstdint>
 
+#include <ftl/flags.h>
+
 namespace android::scheduler {
 
 enum class Feature : std::uint8_t {
@@ -29,6 +29,6 @@
     kTracePredictedVsync = 0b1000,
 };
 
-using FeatureFlags = Flags<Feature>;
+using FeatureFlags = ftl::Flags<Feature>;
 
 } // namespace android::scheduler
diff --git a/services/surfaceflinger/Tracing/TransactionProtoParser.cpp b/services/surfaceflinger/Tracing/TransactionProtoParser.cpp
index d249b60..a73eccf 100644
--- a/services/surfaceflinger/Tracing/TransactionProtoParser.cpp
+++ b/services/surfaceflinger/Tracing/TransactionProtoParser.cpp
@@ -429,7 +429,7 @@
                                                   bufferProto.height(), bufferProto.pixel_format(),
                                                   bufferProto.usage()));
         layer.bufferData->frameNumber = bufferProto.frame_number();
-        layer.bufferData->flags = Flags<BufferData::BufferDataChange>(bufferProto.flags());
+        layer.bufferData->flags = ftl::Flags<BufferData::BufferDataChange>(bufferProto.flags());
         layer.bufferData->cachedBuffer.id = bufferProto.cached_buffer_id();
         layer.bufferData->acquireFence = Fence::NO_FENCE;
     }
diff --git a/services/surfaceflinger/tests/unittests/EventThreadTest.cpp b/services/surfaceflinger/tests/unittests/EventThreadTest.cpp
index 14d8f98..fa36d9c 100644
--- a/services/surfaceflinger/tests/unittests/EventThreadTest.cpp
+++ b/services/surfaceflinger/tests/unittests/EventThreadTest.cpp
@@ -34,12 +34,13 @@
 using namespace std::chrono_literals;
 using namespace std::placeholders;
 
-using namespace android::flag_operators;
 using testing::_;
 using testing::Invoke;
 
 namespace android {
 
+using namespace ftl::flag_operators;
+
 namespace {
 
 constexpr PhysicalDisplayId INTERNAL_DISPLAY_ID = PhysicalDisplayId::fromPort(111u);