Adding blur supported check to shared lib

Bug: 157946272
Test: Manual
Change-Id: I4b8b63e9096d27a06896058b41c8e2cec271dd0d

packages/SystemUI/shared/src/com/android/systemui/shared/system/BlurUtils.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2020 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
+ */
+
+package com.android.systemui.shared.system;
+
+import android.app.ActivityManager;
+import android.os.SystemProperties;
+
+public abstract class BlurUtils {
+
+    private static boolean mBlurSupportedSysProp = SystemProperties
+            .getBoolean("ro.surface_flinger.supports_background_blur", false);
+    private static boolean mBlurDisabledSysProp = SystemProperties
+            .getBoolean("persist.sys.sf.disable_blurs", false);
+
+    /**
+     * If this device can render blurs.
+     *
+     * @return {@code true} when supported.
+     */
+    public static boolean supportsBlursOnWindows() {
+        return mBlurSupportedSysProp && !mBlurDisabledSysProp && ActivityManager.isHighEndGfx();
+    }
+}