diff --git a/backend/Backend.cpp b/backend/Backend.cpp
index 7f87b05..98862ba 100644
--- a/backend/Backend.cpp
+++ b/backend/Backend.cpp
@@ -23,8 +23,7 @@
 
 namespace android {
 
-HWC2::Error Backend::ValidateDisplay(DrmHwcTwo::HwcDisplay *display,
-                                     uint32_t *num_types,
+HWC2::Error Backend::ValidateDisplay(HwcDisplay *display, uint32_t *num_types,
                                      uint32_t *num_requests) {
   *num_types = 0;
   *num_requests = 0;
@@ -67,7 +66,7 @@
 }
 
 std::tuple<int, size_t> Backend::GetClientLayers(
-    DrmHwcTwo::HwcDisplay *display, const std::vector<HwcLayer *> &layers) {
+    HwcDisplay *display, const std::vector<HwcLayer *> &layers) {
   int client_start = -1;
   size_t client_size = 0;
 
@@ -82,7 +81,7 @@
   return GetExtraClientRange(display, layers, client_start, client_size);
 }
 
-bool Backend::IsClientLayer(DrmHwcTwo::HwcDisplay *display, HwcLayer *layer) {
+bool Backend::IsClientLayer(HwcDisplay *display, HwcLayer *layer) {
   return !HardwareSupportsLayerType(layer->GetSfType()) ||
          !BufferInfoGetter::GetInstance()->IsHandleUsable(layer->GetBuffer()) ||
          display->color_transform_hint() != HAL_COLOR_TRANSFORM_IDENTITY ||
@@ -118,7 +117,7 @@
 }
 
 std::tuple<int, int> Backend::GetExtraClientRange(
-    DrmHwcTwo::HwcDisplay *display, const std::vector<HwcLayer *> &layers,
+    HwcDisplay *display, const std::vector<HwcLayer *> &layers,
     int client_start, size_t client_size) {
   size_t avail_planes = display->primary_planes().size() +
                         display->overlay_planes().size();
diff --git a/backend/Backend.h b/backend/Backend.h
index 0273570..1a4833e 100644
--- a/backend/Backend.h
+++ b/backend/Backend.h
@@ -24,12 +24,11 @@
 class Backend {
  public:
   virtual ~Backend() = default;
-  virtual HWC2::Error ValidateDisplay(DrmHwcTwo::HwcDisplay *display,
-                                      uint32_t *num_types,
+  virtual HWC2::Error ValidateDisplay(HwcDisplay *display, uint32_t *num_types,
                                       uint32_t *num_requests);
   virtual std::tuple<int, size_t> GetClientLayers(
-      DrmHwcTwo::HwcDisplay *display, const std::vector<HwcLayer *> &layers);
-  virtual bool IsClientLayer(DrmHwcTwo::HwcDisplay *display, HwcLayer *layer);
+      HwcDisplay *display, const std::vector<HwcLayer *> &layers);
+  virtual bool IsClientLayer(HwcDisplay *display, HwcLayer *layer);
 
  protected:
   static bool HardwareSupportsLayerType(HWC2::Composition comp_type);
@@ -38,7 +37,7 @@
   static void MarkValidated(std::vector<HwcLayer *> &layers,
                             size_t client_first_z, size_t client_size);
   static std::tuple<int, int> GetExtraClientRange(
-      DrmHwcTwo::HwcDisplay *display, const std::vector<HwcLayer *> &layers,
+      HwcDisplay *display, const std::vector<HwcLayer *> &layers,
       int client_start, size_t client_size);
 };
 }  // namespace android
diff --git a/backend/BackendClient.cpp b/backend/BackendClient.cpp
index 73a3b3d..606dca2 100644
--- a/backend/BackendClient.cpp
+++ b/backend/BackendClient.cpp
@@ -20,10 +20,10 @@
 
 namespace android {
 
-HWC2::Error BackendClient::ValidateDisplay(DrmHwcTwo::HwcDisplay *display,
+HWC2::Error BackendClient::ValidateDisplay(HwcDisplay *display,
                                            uint32_t *num_types,
                                            uint32_t * /*num_requests*/) {
-  for (auto & [ layer_handle, layer ] : display->layers()) {
+  for (auto &[layer_handle, layer] : display->layers()) {
     layer.SetValidatedType(HWC2::Composition::Client);
     ++*num_types;
   }
diff --git a/backend/BackendClient.h b/backend/BackendClient.h
index 13543f1..95abb0f 100644
--- a/backend/BackendClient.h
+++ b/backend/BackendClient.h
@@ -23,8 +23,7 @@
 
 class BackendClient : public Backend {
  public:
-  HWC2::Error ValidateDisplay(DrmHwcTwo::HwcDisplay *display,
-                              uint32_t *num_types,
+  HWC2::Error ValidateDisplay(HwcDisplay *display, uint32_t *num_types,
                               uint32_t *num_requests) override;
 };
 }  // namespace android
diff --git a/backend/BackendManager.cpp b/backend/BackendManager.cpp
index 0577e2f..aadef36 100644
--- a/backend/BackendManager.cpp
+++ b/backend/BackendManager.cpp
@@ -41,7 +41,7 @@
   return 0;
 }
 
-int BackendManager::SetBackendForDisplay(DrmHwcTwo::HwcDisplay *display) {
+int BackendManager::SetBackendForDisplay(HwcDisplay *display) {
   std::string driver_name(display->drm()->GetName());
   char backend_override[PROPERTY_VALUE_MAX];
   property_get("vendor.hwc.backend_override", backend_override,
diff --git a/backend/BackendManager.h b/backend/BackendManager.h
index 274484c..751cb78 100644
--- a/backend/BackendManager.h
+++ b/backend/BackendManager.h
@@ -41,10 +41,10 @@
   static BackendManager &GetInstance();
   int RegisterBackend(const std::string &name,
                       BackendConstructorT backend_constructor);
-  int SetBackendForDisplay(DrmHwcTwo::HwcDisplay *display);
+  int SetBackendForDisplay(HwcDisplay *display);
   std::unique_ptr<Backend> GetBackendByName(std::string &name);
-  HWC2::Error ValidateDisplay(DrmHwcTwo::HwcDisplay *display,
-                              uint32_t *num_types, uint32_t *num_requests);
+  HWC2::Error ValidateDisplay(HwcDisplay *display, uint32_t *num_types,
+                              uint32_t *num_requests);
 
  private:
   BackendManager() = default;
diff --git a/backend/BackendRCarDu.cpp b/backend/BackendRCarDu.cpp
index b319d89..0750ee4 100644
--- a/backend/BackendRCarDu.cpp
+++ b/backend/BackendRCarDu.cpp
@@ -22,8 +22,7 @@
 
 namespace android {
 
-bool BackendRCarDu::IsClientLayer(DrmHwcTwo::HwcDisplay *display,
-                                  HwcLayer *layer) {
+bool BackendRCarDu::IsClientLayer(HwcDisplay *display, HwcLayer *layer) {
   hwc_drm_bo_t bo;
 
   int ret = BufferInfoGetter::GetInstance()->ConvertBoInfo(layer->GetBuffer(),
diff --git a/backend/BackendRCarDu.h b/backend/BackendRCarDu.h
index 862bef2..1259c9f 100644
--- a/backend/BackendRCarDu.h
+++ b/backend/BackendRCarDu.h
@@ -23,7 +23,7 @@
 
 class BackendRCarDu : public Backend {
  public:
-  bool IsClientLayer(DrmHwcTwo::HwcDisplay *display, HwcLayer *layer) override;
+  bool IsClientLayer(HwcDisplay *display, HwcLayer *layer) override;
 };
 }  // namespace android