window: Adds a Sustained Performance Mode window flag.

Adds setSustainedPerformanceMode(boolean) API for applications to set
the mode for a given window. The mode will be disabled automatically when the
window is no longer in focus.

Bug: 28150358
Change-Id: Ibe8bc564eeaaccbcaad5c4f792cda16da931dffd
Signed-off-by: Ruchi Kandoi <kandoiruchi@google.com>

7 files changed, 41 insertions, 3 deletions

diff --git a/api/current.txt b/api/current.txt
index 5df8750fcb7c..fd5740f1cdf7 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -43627,6 +43627,7 @@ package android.view {
     method public void setSharedElementsUseOverlay(boolean);
     method public void setSoftInputMode(int);
     method public abstract void setStatusBarColor(int);
+    method public void setSustainedPerformanceMode(boolean);
     method public abstract void setTitle(java.lang.CharSequence);
     method public abstract deprecated void setTitleColor(int);
     method public void setTransitionBackgroundFadeDuration(long);
diff --git a/api/system-current.txt b/api/system-current.txt
index acb699d26a05..f482af1ef0fa 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -46573,6 +46573,7 @@ package android.view {
     method public void setSharedElementsUseOverlay(boolean);
     method public void setSoftInputMode(int);
     method public abstract void setStatusBarColor(int);
+    method public void setSustainedPerformanceMode(boolean);
     method public abstract void setTitle(java.lang.CharSequence);
     method public abstract deprecated void setTitleColor(int);
     method public void setTransitionBackgroundFadeDuration(long);
diff --git a/api/test-current.txt b/api/test-current.txt
index e4b11bd2d4b5..ff7431d0e32d 100644
--- a/api/test-current.txt
+++ b/api/test-current.txt
@@ -43704,6 +43704,7 @@ package android.view {
     method public void setSharedElementsUseOverlay(boolean);
     method public void setSoftInputMode(int);
     method public abstract void setStatusBarColor(int);
+    method public void setSustainedPerformanceMode(boolean);
     method public abstract void setTitle(java.lang.CharSequence);
     method public abstract deprecated void setTitleColor(int);
     method public void setTransitionBackgroundFadeDuration(long);
diff --git a/core/java/android/os/PowerManagerInternal.java b/core/java/android/os/PowerManagerInternal.java
index 9801e1bef2c2..b3cf710094e0 100644
--- a/core/java/android/os/PowerManagerInternal.java
+++ b/core/java/android/os/PowerManagerInternal.java
@@ -55,12 +55,16 @@ public abstract class PowerManagerInternal {
 
 
     /**
-     * Power hint: The user is interacting with the device. The corresponding data field must be
+     * Power hint:
+     * Interaction: The user is interacting with the device. The corresponding data field must be
      * the expected duration of the fling, or 0 if unknown.
      *
-     * This must be kept in sync with the values in hardware/libhardware/include/hardware/power.h
+     * Sustained Performance Mode: Enable/Disables Sustained Performance Mode.
+     *
+     * These must be kept in sync with the values in hardware/libhardware/include/hardware/power.h
      */
     public static final int POWER_HINT_INTERACTION = 2;
+    public static final int POWER_HINT_SUSTAINED_PERFORMANCE_MODE = 6;
 
     public static String wakefulnessToString(int wakefulness) {
         switch (wakefulness) {
diff --git a/core/java/android/view/Window.java b/core/java/android/view/Window.java
index 2f3f0bfa9612..51356578fd9b 100644
--- a/core/java/android/view/Window.java
+++ b/core/java/android/view/Window.java
@@ -1177,6 +1177,15 @@ public abstract class Window {
         return false;
     }
 
+    /* Sets the Sustained Performance requirement for the calling window.
+     * @param enable disables or enables the mode.
+     */
+    public void setSustainedPerformanceMode(boolean enable) {
+        setPrivateFlags(enable
+                ? WindowManager.LayoutParams.PRIVATE_FLAG_SUSTAINED_PERFORMANCE_MODE : 0,
+                WindowManager.LayoutParams.PRIVATE_FLAG_SUSTAINED_PERFORMANCE_MODE);
+    }
+
     private boolean isOutOfBounds(Context context, MotionEvent event) {
         final int x = (int) event.getX();
         final int y = (int) event.getY();
diff --git a/core/java/android/view/WindowManager.java b/core/java/android/view/WindowManager.java
index 89e146b3fed8..54e9942db4d0 100644
--- a/core/java/android/view/WindowManager.java
+++ b/core/java/android/view/WindowManager.java
@@ -1247,6 +1247,13 @@ public interface WindowManager extends ViewManager {
         public static final int PRIVATE_FLAG_FORCE_DRAW_STATUS_BAR_BACKGROUND = 0x00020000;
 
         /**
+         * Flag to indicate that this window needs Sustained Performance Mode if
+         * the device supports it.
+         * @hide
+         */
+        public static final int PRIVATE_FLAG_SUSTAINED_PERFORMANCE_MODE = 0x00020000;
+
+        /**
          * Control flags that are private to the platform.
          * @hide
          */
diff --git a/services/core/java/com/android/server/wm/WindowSurfacePlacer.java b/services/core/java/com/android/server/wm/WindowSurfacePlacer.java
index 1e6c585da12d..928fcc03255a 100644
--- a/services/core/java/com/android/server/wm/WindowSurfacePlacer.java
+++ b/services/core/java/com/android/server/wm/WindowSurfacePlacer.java
@@ -8,6 +8,7 @@ import static android.view.WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
 import static android.view.WindowManager.LayoutParams.FLAG_SHOW_WALLPAPER;
 import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_KEYGUARD;
 import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_NO_MOVE_ANIMATION;
+import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_SUSTAINED_PERFORMANCE_MODE;
 import static android.view.WindowManager.LayoutParams.TYPE_BASE_APPLICATION;
 import static android.view.WindowManager.LayoutParams.TYPE_DOCK_DIVIDER;
 import static android.view.WindowManager.LayoutParams.TYPE_DREAM;
@@ -128,6 +129,9 @@ class WindowSurfacePlacer {
     private boolean mTraversalScheduled;
     private int mDeferDepth = 0;
 
+    private boolean mSustainedPerformanceModeEnabled = false;
+    private boolean mSustainedPerformanceModeCurrent = false;
+
     private static final class LayerAndToken {
         public int layer;
         public AppWindowToken token;
@@ -288,7 +292,7 @@ class WindowSurfacePlacer {
         mButtonBrightness = -1;
         mUserActivityTimeout = -1;
         mObscureApplicationContentOnSecondaryDisplays = false;
-
+        mSustainedPerformanceModeCurrent = false;
         mService.mTransactionSequence++;
 
         final DisplayContent defaultDisplay = mService.getDefaultDisplayContentLocked();
@@ -487,6 +491,13 @@ class WindowSurfacePlacer {
                     mUserActivityTimeout);
         }
 
+        if (mSustainedPerformanceModeCurrent != mSustainedPerformanceModeEnabled) {
+            mSustainedPerformanceModeEnabled = mSustainedPerformanceModeCurrent;
+            mService.mPowerManagerInternal.powerHint(
+                    mService.mPowerManagerInternal.POWER_HINT_SUSTAINED_PERFORMANCE_MODE,
+                    (mSustainedPerformanceModeEnabled ? 1 : 0));
+        }
+
         if (mService.mTurnOnScreen) {
             if (mService.mAllowTheaterModeWakeFromLayout
                     || Settings.Global.getInt(mService.mContext.getContentResolver(),
@@ -1409,6 +1420,7 @@ class WindowSurfacePlacer {
         final LayoutParams attrs = w.mAttrs;
         final int attrFlags = attrs.flags;
         final boolean canBeSeen = w.isDisplayedLw();
+        final int privateflags = attrs.privateFlags;
 
         if (canBeSeen && w.isObscuringFullscreen(dispInfo)) {
             // This window completely covers everything behind it,
@@ -1469,6 +1481,9 @@ class WindowSurfacePlacer {
                         && w.mAttrs.preferredDisplayModeId != 0) {
                     mPreferredModeId = w.mAttrs.preferredDisplayModeId;
                 }
+                if ((privateflags & PRIVATE_FLAG_SUSTAINED_PERFORMANCE_MODE) != 0) {
+                    mSustainedPerformanceModeCurrent = true;
+                }
             }
         }
     }