diff --git a/libs/ui/DisplayMode.cpp b/libs/ui/DisplayMode.cpp
new file mode 100644
index 0000000..cf05dbf
--- /dev/null
+++ b/libs/ui/DisplayMode.cpp
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <ui/DisplayMode.h>
+
+#include <cstdint>
+
+#include <ui/FlattenableHelpers.h>
+
+#define RETURN_IF_ERROR(op) \
+    if (const status_t status = (op); status != OK) return status;
+
+namespace android::ui {
+
+size_t DisplayMode::getFlattenedSize() const {
+    return FlattenableHelpers::getFlattenedSize(id) +
+            FlattenableHelpers::getFlattenedSize(resolution) +
+            FlattenableHelpers::getFlattenedSize(xDpi) +
+            FlattenableHelpers::getFlattenedSize(yDpi) +
+            FlattenableHelpers::getFlattenedSize(refreshRate) +
+            FlattenableHelpers::getFlattenedSize(appVsyncOffset) +
+            FlattenableHelpers::getFlattenedSize(sfVsyncOffset) +
+            FlattenableHelpers::getFlattenedSize(presentationDeadline) +
+            FlattenableHelpers::getFlattenedSize(group);
+}
+
+status_t DisplayMode::flatten(void* buffer, size_t size) const {
+    if (size < getFlattenedSize()) {
+        return NO_MEMORY;
+    }
+    RETURN_IF_ERROR(FlattenableHelpers::flatten(&buffer, &size, id));
+    RETURN_IF_ERROR(FlattenableHelpers::flatten(&buffer, &size, resolution));
+    RETURN_IF_ERROR(FlattenableHelpers::flatten(&buffer, &size, xDpi));
+    RETURN_IF_ERROR(FlattenableHelpers::flatten(&buffer, &size, yDpi));
+    RETURN_IF_ERROR(FlattenableHelpers::flatten(&buffer, &size, refreshRate));
+    RETURN_IF_ERROR(FlattenableHelpers::flatten(&buffer, &size, appVsyncOffset));
+    RETURN_IF_ERROR(FlattenableHelpers::flatten(&buffer, &size, sfVsyncOffset));
+    RETURN_IF_ERROR(FlattenableHelpers::flatten(&buffer, &size, presentationDeadline));
+    RETURN_IF_ERROR(FlattenableHelpers::flatten(&buffer, &size, group));
+    return OK;
+}
+
+status_t DisplayMode::unflatten(const void* buffer, size_t size) {
+    RETURN_IF_ERROR(FlattenableHelpers::unflatten(&buffer, &size, &id));
+    RETURN_IF_ERROR(FlattenableHelpers::unflatten(&buffer, &size, &resolution));
+    RETURN_IF_ERROR(FlattenableHelpers::unflatten(&buffer, &size, &xDpi));
+    RETURN_IF_ERROR(FlattenableHelpers::unflatten(&buffer, &size, &yDpi));
+    RETURN_IF_ERROR(FlattenableHelpers::unflatten(&buffer, &size, &refreshRate));
+    RETURN_IF_ERROR(FlattenableHelpers::unflatten(&buffer, &size, &appVsyncOffset));
+    RETURN_IF_ERROR(FlattenableHelpers::unflatten(&buffer, &size, &sfVsyncOffset));
+    RETURN_IF_ERROR(FlattenableHelpers::unflatten(&buffer, &size, &presentationDeadline));
+    RETURN_IF_ERROR(FlattenableHelpers::unflatten(&buffer, &size, &group));
+    return OK;
+}
+
+} // namespace android::ui