Fix back home animation blurring.

Particularly with predictive back in cases that the app doesn't
support peeking the home screen, there was a thrashing animation
due to a secondary blur animation being applied. So in some cases,
it would rapidly alternate between 0 blur and the correct animation
blur. This wasn't necessarily user-visible, but likely contributed
to some performance jank.

Also ensure the scaling workspace blur uses the correct starting
depth and duration.

Demo: https://drive.google.com/file/d/1AffSvzlXycg8Yl4ULpctKADO6IdvvO3m/view?usp=drive_link&resourcekey=0--zqQ341w7U3MhRBwSYrsyA

Bug: 407534544
Test: Manual (predictive back, back without predictive peek, home)
Flag: com.android.launcher3.predictive_back_to_home_blur
Flag: com.android.launcher3.all_apps_blur
Change-Id: I76ed59e99aaef5bd44e8f5b0290f01763a8d4b0f

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

@@ -1761,12 +1761,6 @@ public class QuickstepTransitionManager implements OnDeviceProfileChangeListener
                             true /* animateOverviewScrim */, launcherView).getAnimators());
                 }
 
-                if (!areAllTargetsTranslucent(appTargets)) {
-                    anim.play(ObjectAnimator.ofFloat(mLauncher.getDepthController().stateDepth,
-                            MULTI_PROPERTY_VALUE,
-                            BACKGROUND_APP.getDepth(mLauncher), NORMAL.getDepth(mLauncher)));
-                }
-
                 // We play StaggeredWorkspaceAnim as a part of the closing window animation.
                 playWorkspaceReveal = false;
             }

quickstep/src/com/android/quickstep/LauncherBackAnimationController.java

@@ -25,6 +25,7 @@ import static com.android.launcher3.AbstractFloatingView.TYPE_REBIND_SAFE;
 import static com.android.launcher3.BaseActivity.INVISIBLE_ALL;
 import static com.android.launcher3.BaseActivity.INVISIBLE_BY_PENDING_FLAGS;
 import static com.android.launcher3.BaseActivity.PENDING_INVISIBLE_BY_WALLPAPER_ANIMATION;
+import static com.android.launcher3.Flags.enableOverviewBackgroundWallpaperBlur;
 import static com.android.window.flags.Flags.predictiveBackThreeButtonNav;
 import static com.android.window.flags.Flags.removeDepartTargetFromMotion;
 
@@ -98,7 +99,6 @@ public class LauncherBackAnimationController {
             Flags.predictiveBackToHomePolish() ? 0.75f : 0.85f;
     private static final float MAX_SCRIM_ALPHA_DARK = 0.8f;
     private static final float MAX_SCRIM_ALPHA_LIGHT = 0.2f;
-    private static final int MAX_BLUR_RADIUS = 20;
     private static final int MIN_BLUR_RADIUS_PRE_COMMIT = 10;
 
     private final QuickstepTransitionManager mQuickstepTransitionManager;
@@ -130,6 +130,7 @@ public class LauncherBackAnimationController {
     private ValueAnimator mScrimAlphaAnimator;
     private float mScrimAlpha;
     private boolean mOverridingStatusBarFlags;
+    private int mMaxBlurRadius;
     private int mLastBlurRadius = 0;
 
     private final ComponentCallbacks mComponentCallbacks = new ComponentCallbacks() {
@@ -411,7 +412,7 @@ public class LauncherBackAnimationController {
         final float[] colorComponents = new float[] { 0f, 0f, 0f };
         mScrimAlpha = (isDarkTheme)
                 ? MAX_SCRIM_ALPHA_DARK : MAX_SCRIM_ALPHA_LIGHT;
-        setBlur(MAX_BLUR_RADIUS);
+        setBlur(mMaxBlurRadius);
         mTransaction
                 .setColor(mScrimLayer, colorComponents)
                 .setAlpha(mScrimLayer, mScrimAlpha)
@@ -439,7 +440,7 @@ public class LauncherBackAnimationController {
             // Scrim hasn't been attached yet. Let's attach it.
             addScrimLayer();
         } else {
-            mLastBlurRadius = (int) lerp(MAX_BLUR_RADIUS, MIN_BLUR_RADIUS_PRE_COMMIT, progress);
+            mLastBlurRadius = (int) lerp(mMaxBlurRadius, MIN_BLUR_RADIUS_PRE_COMMIT, progress);
             setBlur(mLastBlurRadius);
         }
         float screenWidth = mStartRect.width();
@@ -626,6 +627,12 @@ public class LauncherBackAnimationController {
                 : 0;
         mWindowScaleStartCornerRadius = QuickStepContract.getWindowCornerRadius(mLauncher);
         mStatusBarHeight = SystemBarUtils.getStatusBarHeight(mLauncher);
+        if (Flags.allAppsBlur() || enableOverviewBackgroundWallpaperBlur()) {
+            mMaxBlurRadius = mLauncher.getResources().getDimensionPixelSize(
+                    R.dimen.max_depth_blur_radius_enhanced);
+        } else {
+            mMaxBlurRadius = mLauncher.getResources().getInteger(R.integer.max_depth_blur_radius);
+        }
     }
 
     /**

quickstep/src/com/android/quickstep/util/ScalingWorkspaceRevealAnim.kt

@@ -147,10 +147,12 @@ class ScalingWorkspaceRevealAnim(
         }
 
         val transitionConfig = StateAnimationConfig()
+        transitionConfig.duration = SCALE_DURATION_MS
 
         // Match the Wallpaper animation to the rest of the content.
         val depthController = (launcher as? QuickstepLauncher)?.depthController
         transitionConfig.setInterpolator(StateAnimationConfig.ANIM_DEPTH, SCALE_INTERPOLATOR)
+        depthController?.stateDepth?.value = LauncherState.BACKGROUND_APP.getDepth(launcher)
         depthController?.setStateWithAnimation(LauncherState.NORMAL, transitionConfig, animation)
 
         // Make sure that the contrast scrim animates correctly if needed.