Merge "Fixing surface blur when using multiple surfaces" into tm-qpr-dev am: 0c0fb6bc08

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/19222535

Change-Id: Icbae40f77402af53ae1190f3d6a21bf554483fa7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

quickstep/src/com/android/launcher3/BaseQuickstepLauncher.java

@@ -110,7 +110,7 @@ import java.util.stream.Stream;
  */
 public abstract class BaseQuickstepLauncher extends Launcher {
 
-    private DepthController mDepthController = new DepthController(this);
+    private DepthController mDepthController;
     private QuickstepTransitionManager mAppTransitionManager;
 
     /**
@@ -247,7 +247,6 @@ public abstract class BaseQuickstepLauncher extends Launcher {
     @Override
     public void onScrollChanged(float progress) {
         super.onScrollChanged(progress);
-        mDepthController.onOverlayScrollChanged(progress);
         onTaskbarInAppDisplayProgressUpdate(progress, MINUS_ONE_PAGE_PROGRESS_INDEX);
     }
 
@@ -345,6 +344,7 @@ public abstract class BaseQuickstepLauncher extends Launcher {
         mAppTransitionManager.registerRemoteTransitions();
 
         mTISBindHelper = new TISBindHelper(this, this::onTISConnected);
+        mDepthController = new DepthController(this);
     }
 
     private void onTISConnected(TISBinder binder) {

quickstep/src/com/android/launcher3/QuickstepTransitionManager.java

@@ -78,6 +78,7 @@ import android.os.UserHandle;
 import android.provider.Settings;
 import android.util.Pair;
 import android.util.Size;
+import android.view.CrossWindowBlurListeners;
 import android.view.SurfaceControl;
 import android.view.View;
 import android.view.ViewRootImpl;
@@ -93,6 +94,7 @@ import androidx.core.graphics.ColorUtils;
 import com.android.launcher3.DeviceProfile.OnDeviceProfileChangeListener;
 import com.android.launcher3.LauncherAnimationRunner.RemoteAnimationFactory;
 import com.android.launcher3.anim.AnimationSuccessListener;
+import com.android.launcher3.anim.AnimatorListeners;
 import com.android.launcher3.dragndrop.DragLayer;
 import com.android.launcher3.icons.FastBitmapDrawable;
 import com.android.launcher3.shortcuts.DeepShortcutView;
@@ -143,8 +145,6 @@ import java.util.List;
  */
 public class QuickstepTransitionManager implements OnDeviceProfileChangeListener {
 
-    private static final String TAG = "QuickstepTransition";
-
     private static final boolean ENABLE_SHELL_STARTING_SURFACE =
             SystemProperties.getBoolean("persist.debug.shell_starting_surface", true);
 
@@ -1044,54 +1044,37 @@ public class QuickstepTransitionManager implements OnDeviceProfileChangeListener
     private ObjectAnimator getBackgroundAnimator() {
         // When launching an app from overview that doesn't map to a task, we still want to just
         // blur the wallpaper instead of the launcher surface as well
-        boolean allowBlurringLauncher = mLauncher.getStateManager().getState() != OVERVIEW;
-        DepthController depthController = mLauncher.getDepthController();
+        boolean allowBlurringLauncher = mLauncher.getStateManager().getState() != OVERVIEW
+                && BlurUtils.supportsBlursOnWindows();
+
+        MyDepthController depthController = new MyDepthController(mLauncher);
         ObjectAnimator backgroundRadiusAnim = ObjectAnimator.ofFloat(depthController, DEPTH,
-                BACKGROUND_APP.getDepth(mLauncher))
+                        BACKGROUND_APP.getDepth(mLauncher))
                 .setDuration(APP_LAUNCH_DURATION);
+
         if (allowBlurringLauncher) {
-            final SurfaceControl dimLayer;
-            if (BlurUtils.supportsBlursOnWindows()) {
-                // Create a temporary effect layer, that lives on top of launcher, so we can apply
-                // the blur to it. The EffectLayer will be fullscreen, which will help with caching
-                // optimizations on the SurfaceFlinger side:
-                // - Results would be able to be cached as a texture
-                // - There won't be texture allocation overhead, because EffectLayers don't have
-                //   buffers
-                ViewRootImpl viewRootImpl = mLauncher.getDragLayer().getViewRootImpl();
-                SurfaceControl parent = viewRootImpl != null
-                        ? viewRootImpl.getSurfaceControl()
-                        : null;
-                dimLayer = new SurfaceControl.Builder()
-                        .setName("Blur layer")
-                        .setParent(parent)
-                        .setOpaque(false)
-                        .setHidden(false)
-                        .setEffectLayer()
-                        .build();
-            } else {
-                dimLayer = null;
-            }
+            // Create a temporary effect layer, that lives on top of launcher, so we can apply
+            // the blur to it. The EffectLayer will be fullscreen, which will help with caching
+            // optimizations on the SurfaceFlinger side:
+            // - Results would be able to be cached as a texture
+            // - There won't be texture allocation overhead, because EffectLayers don't have
+            //   buffers
+            ViewRootImpl viewRootImpl = mLauncher.getDragLayer().getViewRootImpl();
+            SurfaceControl parent = viewRootImpl != null
+                    ? viewRootImpl.getSurfaceControl()
+                    : null;
+            SurfaceControl dimLayer = new SurfaceControl.Builder()
+                    .setName("Blur layer")
+                    .setParent(parent)
+                    .setOpaque(false)
+                    .setHidden(false)
+                    .setEffectLayer()
+                    .build();
 
-            depthController.setSurface(dimLayer);
-            backgroundRadiusAnim.addListener(new AnimatorListenerAdapter() {
-                @Override
-                public void onAnimationStart(Animator animation) {
-                    depthController.setIsInLaunchTransition(true);
-                }
-
-                @Override
-                public void onAnimationEnd(Animator animation) {
-                    depthController.setIsInLaunchTransition(false);
-                    depthController.setSurface(null);
-                    if (dimLayer != null) {
-                        new SurfaceControl.Transaction()
-                                .remove(dimLayer)
-                                .apply();
-                    }
-                }
-            });
+            backgroundRadiusAnim.addListener(AnimatorListeners.forEndCallback(() ->
+                    new SurfaceControl.Transaction().remove(dimLayer).apply()));
         }
+
         return backgroundRadiusAnim;
     }
 
@@ -1936,4 +1919,17 @@ public class QuickstepTransitionManager implements OnDeviceProfileChangeListener
             return Utilities.mapToRange(progress, start, end, 1, 0, ACCEL_1_5);
         }
     }
+
+    private static class MyDepthController extends DepthController {
+        MyDepthController(Launcher l) {
+            super(l);
+            setCrossWindowBlursEnabled(
+                    CrossWindowBlurListeners.getInstance().isCrossWindowBlurEnabled());
+        }
+
+        @Override
+        public void setSurface(SurfaceControl surface) {
+            super.setSurface(surface);
+        }
+    }
 }

quickstep/src/com/android/launcher3/statehandlers/DepthController.java

@@ -23,13 +23,8 @@ import static com.android.launcher3.states.StateAnimationConfig.SKIP_DEPTH_CONTR
 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.ObjectAnimator;
-import android.app.WallpaperManager;
-import android.os.IBinder;
-import android.os.SystemProperties;
 import android.util.FloatProperty;
-import android.view.AttachedSurfaceControl;
 import android.view.CrossWindowBlurListeners;
-import android.view.SurfaceControl;
 import android.view.View;
 import android.view.ViewRootImpl;
 import android.view.ViewTreeObserver;
@@ -37,12 +32,11 @@ import android.view.ViewTreeObserver;
 import com.android.launcher3.BaseActivity;
 import com.android.launcher3.Launcher;
 import com.android.launcher3.LauncherState;
-import com.android.launcher3.R;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.anim.PendingAnimation;
 import com.android.launcher3.statemanager.StateManager.StateHandler;
 import com.android.launcher3.states.StateAnimationConfig;
-import com.android.systemui.shared.system.BlurUtils;
+import com.android.quickstep.util.BaseDepthController;
 
 import java.io.PrintWriter;
 import java.util.function.Consumer;
@@ -50,23 +44,9 @@ import java.util.function.Consumer;
 /**
  * Controls blur and wallpaper zoom, for the Launcher surface only.
  */
-public class DepthController implements StateHandler<LauncherState>,
+public class DepthController extends BaseDepthController implements StateHandler<LauncherState>,
         BaseActivity.MultiWindowModeChangedListener {
 
-    private static final boolean OVERLAY_SCROLL_ENABLED = false;
-    public static final FloatProperty<DepthController> DEPTH =
-            new FloatProperty<DepthController>("depth") {
-                @Override
-                public void setValue(DepthController depthController, float depth) {
-                    depthController.setDepth(depth);
-                }
-
-                @Override
-                public Float get(DepthController depthController) {
-                    return depthController.mDepth;
-                }
-            };
-
     /**
      * A property that updates the background blur within a given range of values (ie. even if the
      * animator goes beyond 0..1, the interpolated value will still be bounded).
@@ -92,96 +72,46 @@ public class DepthController implements StateHandler<LauncherState>,
         }
     }
 
-    private final ViewTreeObserver.OnDrawListener mOnDrawListener =
-            new ViewTreeObserver.OnDrawListener() {
-                @Override
-                public void onDraw() {
-                    View view = mLauncher.getDragLayer();
-                    ViewRootImpl viewRootImpl = view.getViewRootImpl();
-                    boolean applied = setSurface(
-                            viewRootImpl != null ? viewRootImpl.getSurfaceControl() : null);
-                    if (!applied) {
-                        dispatchTransactionSurface(mDepth);
-                    }
-                    view.post(() -> view.getViewTreeObserver().removeOnDrawListener(this));
-                }
-            };
+    private final ViewTreeObserver.OnDrawListener mOnDrawListener = this::onLauncherDraw;
 
-    private final Consumer<Boolean> mCrossWindowBlurListener = new Consumer<Boolean>() {
-        @Override
-        public void accept(Boolean enabled) {
-            mCrossWindowBlursEnabled = enabled;
-            dispatchTransactionSurface(mDepth);
-        }
-    };
+    private final Consumer<Boolean> mCrossWindowBlurListener = this::setCrossWindowBlursEnabled;
 
-    private final Runnable mOpaquenessListener = new Runnable() {
-        @Override
-        public void run() {
-            dispatchTransactionSurface(mDepth);
-        }
-    };
+    private final Runnable mOpaquenessListener = this::applyDepthAndBlur;
 
-    private final Launcher mLauncher;
-    /**
-     * Blur radius when completely zoomed out, in pixels.
-     */
-    private int mMaxBlurRadius;
-    private boolean mCrossWindowBlursEnabled;
-    private WallpaperManager mWallpaperManager;
-    private SurfaceControl mSurface;
-    /**
-     * How visible the -1 overlay is, from 0 to 1.
-     */
-    private float mOverlayScrollProgress;
-    /**
-     * Ratio from 0 to 1, where 0 is fully zoomed out, and 1 is zoomed in.
-     * @see android.service.wallpaper.WallpaperService.Engine#onZoomChanged(float)
-     */
-    private float mDepth;
-    /**
-     * Last blur value, in pixels, that was applied.
-     * For debugging purposes.
-     */
-    private int mCurrentBlur;
     /**
      * If we're launching and app and should not be blurring the screen for performance reasons.
      */
     private boolean mBlurDisabledForAppLaunch;
-    /**
-     * If we requested early wake-up offsets to SurfaceFlinger.
-     */
-    private boolean mInEarlyWakeUp;
+
 
     // Workaround for animating the depth when multiwindow mode changes.
     private boolean mIgnoreStateChangesDuringMultiWindowAnimation = false;
 
-    // Hints that there is potentially content behind Launcher and that we shouldn't optimize by
-    // marking the launcher surface as opaque.  Only used in certain Launcher states.
-    private boolean mHasContentBehindLauncher;
-
     private View.OnAttachStateChangeListener mOnAttachListener;
 
     public DepthController(Launcher l) {
-        mLauncher = l;
+        super(l);
+    }
+
+    private void onLauncherDraw() {
+        View view = mLauncher.getDragLayer();
+        ViewRootImpl viewRootImpl = view.getViewRootImpl();
+        setSurface(viewRootImpl != null ? viewRootImpl.getSurfaceControl() : null);
+        view.post(() -> view.getViewTreeObserver().removeOnDrawListener(mOnDrawListener));
     }
 
     private void ensureDependencies() {
-        if (mWallpaperManager == null) {
-            mMaxBlurRadius = mLauncher.getResources().getInteger(R.integer.max_depth_blur_radius);
-            mWallpaperManager = mLauncher.getSystemService(WallpaperManager.class);
-        }
-
         if (mLauncher.getRootView() != null && mOnAttachListener == null) {
+            View rootView = mLauncher.getRootView();
             mOnAttachListener = new View.OnAttachStateChangeListener() {
                 @Override
                 public void onViewAttachedToWindow(View view) {
+                    CrossWindowBlurListeners.getInstance().addListener(mLauncher.getMainExecutor(),
+                            mCrossWindowBlurListener);
+                    mLauncher.getScrimView().addOpaquenessListener(mOpaquenessListener);
+
                     // To handle the case where window token is invalid during last setDepth call.
-                    IBinder windowToken = mLauncher.getRootView().getWindowToken();
-                    if (windowToken != null) {
-                        mWallpaperManager.setWallpaperZoomOut(windowToken, mDepth);
-                    }
-                    onAttached();
+                    applyDepthAndBlur();
                 }
 
                 @Override
@@ -190,23 +120,13 @@ public class DepthController implements StateHandler<LauncherState>,
                     mLauncher.getScrimView().removeOpaquenessListener(mOpaquenessListener);
                 }
             };
-            mLauncher.getRootView().addOnAttachStateChangeListener(mOnAttachListener);
-            if (mLauncher.getRootView().isAttachedToWindow()) {
-                onAttached();
+            rootView.addOnAttachStateChangeListener(mOnAttachListener);
+            if (rootView.isAttachedToWindow()) {
+                mOnAttachListener.onViewAttachedToWindow(rootView);
             }
         }
     }
 
-    private void onAttached() {
-        CrossWindowBlurListeners.getInstance().addListener(mLauncher.getMainExecutor(),
-                mCrossWindowBlurListener);
-        mLauncher.getScrimView().addOpaquenessListener(mOpaquenessListener);
-    }
-
-    public void setHasContentBehindLauncher(boolean hasContentBehindLauncher) {
-        mHasContentBehindLauncher = hasContentBehindLauncher;
-    }
-
     /**
      * Sets if the underlying activity is started or not
      */
@@ -219,26 +139,6 @@ public class DepthController implements StateHandler<LauncherState>,
         }
     }
 
-    /**
-     * Sets the specified app target surface to apply the blur to.
-     * @return true when surface was valid and transaction was dispatched.
-     */
-    public boolean setSurface(SurfaceControl surface) {
-        // Set launcher as the SurfaceControl when we don't need an external target anymore.
-        if (surface == null) {
-            ViewRootImpl viewRootImpl = mLauncher.getDragLayer().getViewRootImpl();
-            surface = viewRootImpl != null ? viewRootImpl.getSurfaceControl() : null;
-        }
-        if (mSurface != surface) {
-            mSurface = surface;
-            if (surface != null) {
-                dispatchTransactionSurface(mDepth);
-                return true;
-            }
-        }
-        return false;
-    }
-
     @Override
     public void setState(LauncherState toState) {
         if (mSurface == null || mIgnoreStateChangesDuringMultiWindowAnimation) {
@@ -249,7 +149,7 @@ public class DepthController implements StateHandler<LauncherState>,
         if (Float.compare(mDepth, toDepth) != 0) {
             setDepth(toDepth);
         } else if (toState == LauncherState.OVERVIEW) {
-            dispatchTransactionSurface(mDepth);
+            applyDepthAndBlur();
         } else if (toState == LauncherState.BACKGROUND_APP) {
             mLauncher.getDragLayer().getViewTreeObserver().addOnDrawListener(mOnDrawListener);
         }
@@ -269,90 +169,10 @@ public class DepthController implements StateHandler<LauncherState>,
         }
     }
 
-    /**
-     * If we're launching an app from the home screen.
-     */
-    public void setIsInLaunchTransition(boolean inLaunchTransition) {
-        boolean blurEnabled = SystemProperties.getBoolean("ro.launcher.blur.appLaunch", true);
-        mBlurDisabledForAppLaunch = inLaunchTransition && !blurEnabled;
-        if (!inLaunchTransition) {
-            // Reset depth at the end of the launch animation, so the wallpaper won't be
-            // zoomed out if an app crashes.
-            setDepth(0f);
-        }
-    }
-
-    private void setDepth(float depth) {
-        depth = Utilities.boundToRange(depth, 0, 1);
-        // Round out the depth to dedupe frequent, non-perceptable updates
-        int depthI = (int) (depth * 256);
-        float depthF = depthI / 256f;
-        if (Float.compare(mDepth, depthF) == 0) {
-            return;
-        }
-        dispatchTransactionSurface(depthF);
-        mDepth = depthF;
-    }
-
-    public void onOverlayScrollChanged(float progress) {
-        if (!OVERLAY_SCROLL_ENABLED) {
-            return;
-        }
-        // Add some padding to the progress, such we don't change the depth on the last frames of
-        // the animation. It's possible that a user flinging the feed quickly would scroll
-        // horizontally by accident, causing the device to enter client composition unnecessarily.
-        progress = Math.min(progress * 1.1f, 1f);
-
-        // Round out the progress to dedupe frequent, non-perceptable updates
-        int progressI = (int) (progress * 256);
-        float progressF = Utilities.boundToRange(progressI / 256f, 0f, 1f);
-        if (Float.compare(mOverlayScrollProgress, progressF) == 0) {
-            return;
-        }
-        mOverlayScrollProgress = progressF;
-        dispatchTransactionSurface(mDepth);
-    }
-
-    private boolean dispatchTransactionSurface(float depth) {
-        boolean supportsBlur = BlurUtils.supportsBlursOnWindows();
-        if (supportsBlur && (mSurface == null || !mSurface.isValid())) {
-            return false;
-        }
+    @Override
+    protected void applyDepthAndBlur() {
         ensureDependencies();
-        depth = Math.max(depth, mOverlayScrollProgress);
-        IBinder windowToken = mLauncher.getRootView().getWindowToken();
-        if (windowToken != null) {
-            mWallpaperManager.setWallpaperZoomOut(windowToken, depth);
-        }
-
-        if (supportsBlur) {
-            boolean hasOpaqueBg = mLauncher.getScrimView().isFullyOpaque();
-            boolean isSurfaceOpaque = !mHasContentBehindLauncher && hasOpaqueBg;
-
-            mCurrentBlur = !mCrossWindowBlursEnabled || mBlurDisabledForAppLaunch || hasOpaqueBg
-                    ? 0 : (int) (depth * mMaxBlurRadius);
-            SurfaceControl.Transaction transaction = new SurfaceControl.Transaction()
-                    .setBackgroundBlurRadius(mSurface, mCurrentBlur)
-                    .setOpaque(mSurface, isSurfaceOpaque);
-
-            // Set early wake-up flags when we know we're executing an expensive operation, this way
-            // SurfaceFlinger will adjust its internal offsets to avoid jank.
-            boolean wantsEarlyWakeUp = depth > 0 && depth < 1;
-            if (wantsEarlyWakeUp && !mInEarlyWakeUp) {
-                transaction.setEarlyWakeupStart();
-                mInEarlyWakeUp = true;
-            } else if (!wantsEarlyWakeUp && mInEarlyWakeUp) {
-                transaction.setEarlyWakeupEnd();
-                mInEarlyWakeUp = false;
-            }
-
-            AttachedSurfaceControl rootSurfaceControl =
-                    mLauncher.getRootView().getRootSurfaceControl();
-            if (rootSurfaceControl != null) {
-                rootSurfaceControl.applyTransactionOnDraw(transaction);
-            }
-        }
-        return true;
+        super.applyDepthAndBlur();
     }
 
     @Override
@@ -377,7 +197,6 @@ public class DepthController implements StateHandler<LauncherState>,
         writer.println(prefix + "\tmMaxBlurRadius=" + mMaxBlurRadius);
         writer.println(prefix + "\tmCrossWindowBlursEnabled=" + mCrossWindowBlursEnabled);
         writer.println(prefix + "\tmSurface=" + mSurface);
-        writer.println(prefix + "\tmOverlayScrollProgress=" + mOverlayScrollProgress);
         writer.println(prefix + "\tmDepth=" + mDepth);
         writer.println(prefix + "\tmCurrentBlur=" + mCurrentBlur);
         writer.println(prefix + "\tmBlurDisabledForAppLaunch=" + mBlurDisabledForAppLaunch);

quickstep/src/com/android/quickstep/util/BaseDepthController.java

@@ -0,0 +1,153 @@
+/*
+ * Copyright (C) 2022 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.quickstep.util;
+
+import android.app.WallpaperManager;
+import android.os.IBinder;
+import android.util.FloatProperty;
+import android.view.AttachedSurfaceControl;
+import android.view.SurfaceControl;
+
+import com.android.launcher3.Launcher;
+import com.android.launcher3.R;
+import com.android.launcher3.Utilities;
+import com.android.systemui.shared.system.BlurUtils;
+
+/**
+ * Utility class for applying depth effect
+ */
+public class BaseDepthController {
+
+    public static final FloatProperty<BaseDepthController> DEPTH =
+            new FloatProperty<BaseDepthController>("depth") {
+                @Override
+                public void setValue(BaseDepthController depthController, float depth) {
+                    depthController.setDepth(depth);
+                }
+
+                @Override
+                public Float get(BaseDepthController depthController) {
+                    return depthController.mDepth;
+                }
+            };
+
+    protected final Launcher mLauncher;
+
+    /**
+     * Blur radius when completely zoomed out, in pixels.
+     */
+    protected final int mMaxBlurRadius;
+    protected final WallpaperManager mWallpaperManager;
+    protected boolean mCrossWindowBlursEnabled;
+
+    /**
+     * Ratio from 0 to 1, where 0 is fully zoomed out, and 1 is zoomed in.
+     * @see android.service.wallpaper.WallpaperService.Engine#onZoomChanged(float)
+     */
+    protected float mDepth;
+
+    protected SurfaceControl mSurface;
+
+    // Hints that there is potentially content behind Launcher and that we shouldn't optimize by
+    // marking the launcher surface as opaque.  Only used in certain Launcher states.
+    private boolean mHasContentBehindLauncher;
+    /**
+     * Last blur value, in pixels, that was applied.
+     * For debugging purposes.
+     */
+    protected int mCurrentBlur;
+    /**
+     * If we requested early wake-up offsets to SurfaceFlinger.
+     */
+    protected boolean mInEarlyWakeUp;
+
+    public BaseDepthController(Launcher activity) {
+        mLauncher = activity;
+        mMaxBlurRadius = activity.getResources().getInteger(R.integer.max_depth_blur_radius);
+        mWallpaperManager = activity.getSystemService(WallpaperManager.class);
+    }
+
+    protected void setCrossWindowBlursEnabled(boolean isEnabled) {
+        mCrossWindowBlursEnabled = isEnabled;
+        applyDepthAndBlur();
+    }
+
+    public void setHasContentBehindLauncher(boolean hasContentBehindLauncher) {
+        mHasContentBehindLauncher = hasContentBehindLauncher;
+    }
+
+    protected void applyDepthAndBlur() {
+        float depth = mDepth;
+        IBinder windowToken = mLauncher.getRootView().getWindowToken();
+        if (windowToken != null) {
+            mWallpaperManager.setWallpaperZoomOut(windowToken, depth);
+        }
+
+        if (!BlurUtils.supportsBlursOnWindows()) {
+            return;
+        }
+        if (mSurface == null || !mSurface.isValid()) {
+            return;
+        }
+        boolean hasOpaqueBg = mLauncher.getScrimView().isFullyOpaque();
+        boolean isSurfaceOpaque = !mHasContentBehindLauncher && hasOpaqueBg;
+
+        mCurrentBlur = !mCrossWindowBlursEnabled || hasOpaqueBg
+                ? 0 : (int) (depth * mMaxBlurRadius);
+        SurfaceControl.Transaction transaction = new SurfaceControl.Transaction()
+                .setBackgroundBlurRadius(mSurface, mCurrentBlur)
+                .setOpaque(mSurface, isSurfaceOpaque);
+
+        // Set early wake-up flags when we know we're executing an expensive operation, this way
+        // SurfaceFlinger will adjust its internal offsets to avoid jank.
+        boolean wantsEarlyWakeUp = depth > 0 && depth < 1;
+        if (wantsEarlyWakeUp && !mInEarlyWakeUp) {
+            transaction.setEarlyWakeupStart();
+            mInEarlyWakeUp = true;
+        } else if (!wantsEarlyWakeUp && mInEarlyWakeUp) {
+            transaction.setEarlyWakeupEnd();
+            mInEarlyWakeUp = false;
+        }
+
+        AttachedSurfaceControl rootSurfaceControl =
+                mLauncher.getRootView().getRootSurfaceControl();
+        if (rootSurfaceControl != null) {
+            rootSurfaceControl.applyTransactionOnDraw(transaction);
+        }
+    }
+
+    protected void setDepth(float depth) {
+        depth = Utilities.boundToRange(depth, 0, 1);
+        // Round out the depth to dedupe frequent, non-perceptable updates
+        int depthI = (int) (depth * 256);
+        float depthF = depthI / 256f;
+        if (Float.compare(mDepth, depthF) == 0) {
+            return;
+        }
+        mDepth = depthF;
+        applyDepthAndBlur();
+    }
+
+    /**
+     * Sets the specified app target surface to apply the blur to.
+     */
+    protected void setSurface(SurfaceControl surface) {
+        if (mSurface != surface) {
+            mSurface = surface;
+            applyDepthAndBlur();
+        }
+    }
+}