a30s: Add surfaceflinger UDFPS extension lib

a30s/BoardConfig.mk

@@ -19,6 +19,7 @@ BOARD_VENDORIMAGE_PARTITION_SIZE   := 645922816
 TARGET_SEC_FP_REQUEST_TOUCH_EVENT := true
 TARGET_SEC_FP_REQUEST_FORCE_CALIBRATE := true
 TARGET_ADDITIONAL_GRALLOC_10_USAGE_BITS := 0x2000U | 0x400000000LL
+TARGET_SURFACEFLINGER_UDFPS_LIB := //$(DEVICE_PATH):libudfps_extension.a30s
 
 # Inherit common board flags
 include device/samsung/universal7885-common/BoardConfigCommon.mk

a30s/fingerprint/Android.bp

@@ -0,0 +1,7 @@
+cc_library_static {
+    name: "libudfps_extension.a30s",
+    srcs: ["UdfpsExtension.cpp"],
+    include_dirs: [
+        "frameworks/native/services/surfaceflinger/CompositionEngine/include"
+    ],
+}

a30s/fingerprint/UdfpsExtension.cpp

@@ -0,0 +1,30 @@
+/*
+ * 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) {
+    (void)z;
+
+    return z;
+}
+
+uint64_t getUdfpsUsageBits(uint64_t usageBits, bool touched) {
+    if (touched) {
+        usageBits |= 0x400000000LL;
+    }
+    return usageBits;
+}