fingerprint: Add libudfps_extension impl

Change-Id: Ic5752c29816e66c6c585069779c8ac3211a0e277

hidl/fingerprint/Android.bp

@@ -20,3 +20,11 @@ cc_binary {
     ],
     local_include_dirs: ["include"],
 }
+
+cc_library_static {
+    name: "libudfps_extension.oplus",
+    srcs: ["UdfpsExtension.cpp"],
+    include_dirs: [
+        "frameworks/native/services/surfaceflinger/CompositionEngine/include",
+    ],
+}

hidl/fingerprint/UdfpsExtension.cpp

@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2022 The LineageOS 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 <compositionengine/UdfpsExtension.h>
+
+uint32_t getUdfpsZOrder(uint32_t z, bool touched) {
+    return touched ? 0x41000033 : z;
+}
+
+uint64_t getUdfpsUsageBits(uint64_t usageBits, bool /*touched*/) {
+    return usageBits;
+}