From 3107d99e54795a4fadc5448014ffe2a1f8de7ce3 Mon Sep 17 00:00:00 2001
From: Matthew Ng <ngmatthew@google.com>
Date: Tue, 21 Nov 2017 15:56:19 -0800
Subject: [PATCH] Add config flag to enable/disable nav bar auto dim

Added a configuration flag to enable whether to auto dim the navigation
bar when wallpaper changes to be invisible such as launching an opaque
app.

OLED devices should have this flag on to prevent/reduce burn and off for
everything else to avoid extra cpu cycles rendering an alpha animation.
By default this is on.

Test: manual
Change-Id: I57ab2a6414b5f6c34e11911346ad4c4d3aac33d0
Fixes: 68812918
(cherry picked from commit 4096e8d028da778f0afbda7df92d6de741650629)
---
 packages/SystemUI/res/values/config.xml                   | 6 ++++++
 .../statusbar/phone/NavigationBarTransitions.java         | 8 +++++---
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/packages/SystemUI/res/values/config.xml b/packages/SystemUI/res/values/config.xml
index e313e868022d6..b5abb4576147e 100644
--- a/packages/SystemUI/res/values/config.xml
+++ b/packages/SystemUI/res/values/config.xml
@@ -95,6 +95,12 @@
 
     <bool name="config_dead_zone_flash">false</bool>
 
+    <!-- Whether to enable dimming navigation buttons when wallpaper is not visible, should be
+         enabled for OLED devices to reduce/prevent burn in on the navigation bar (because of the
+         black background and static button placements) and disabled for all other devices to
+         prevent wasting cpu cycles on the dimming animation -->
+    <bool name="config_navigation_bar_enable_auto_dim_no_visible_wallpaper">true</bool>
+
     <!-- Whether QuickSettings is in a phone landscape -->
     <bool name="quick_settings_wide">false</bool>
 
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarTransitions.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarTransitions.java
index b81a3b0416a40..bd6421c209800 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarTransitions.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarTransitions.java
@@ -26,7 +26,6 @@ import android.view.IWallpaperVisibilityListener;
 import android.view.IWindowManager;
 import android.view.MotionEvent;
 import android.view.View;
-import android.view.WindowManagerGlobal;
 
 import com.android.internal.statusbar.IStatusBarService;
 import com.android.systemui.Dependency;
@@ -37,6 +36,7 @@ public final class NavigationBarTransitions extends BarTransitions {
     private final NavigationBarView mView;
     private final IStatusBarService mBarService;
     private final LightBarTransitionsController mLightTransitionsController;
+    private final boolean mAllowAutoDimWallpaperNotVisible;
     private boolean mWallpaperVisible;
 
     private boolean mLightsOut;
@@ -49,6 +49,8 @@ public final class NavigationBarTransitions extends BarTransitions {
                 ServiceManager.getService(Context.STATUS_BAR_SERVICE));
         mLightTransitionsController = new LightBarTransitionsController(view.getContext(),
                 this::applyDarkIntensity);
+        mAllowAutoDimWallpaperNotVisible = view.getContext().getResources()
+                .getBoolean(R.bool.config_navigation_bar_enable_auto_dim_no_visible_wallpaper);
 
         IWindowManager windowManagerService = Dependency.get(IWindowManager.class);
         Handler handler = Handler.getMain();
@@ -80,8 +82,8 @@ public final class NavigationBarTransitions extends BarTransitions {
 
     @Override
     protected boolean isLightsOut(int mode) {
-        return super.isLightsOut(mode) || (mAutoDim && !mWallpaperVisible
-                && mode != MODE_WARNING);
+        return super.isLightsOut(mode) || (mAllowAutoDimWallpaperNotVisible && mAutoDim
+                && !mWallpaperVisible && mode != MODE_WARNING);
     }
 
     public LightBarTransitionsController getLightTransitionsController() {