Replace snapshot starting windows w/ splashscreen

This CL replaces the use of task snapshot starting windows with
splashscreen starting windows when we have the low RAM snapshots
flag turned on.

Bug: 114136250
Test: Manual test
Change-Id: If9908a1712aa3b3e835761c5bf8c59ac1f99b51c

2 files changed, 13 insertions, 0 deletions

diff --git a/services/core/java/com/android/server/wm/AppWindowToken.java b/services/core/java/com/android/server/wm/AppWindowToken.java
index d8b2b5200f0c..a5341ca11784 100644
--- a/services/core/java/com/android/server/wm/AppWindowToken.java
+++ b/services/core/java/com/android/server/wm/AppWindowToken.java
@@ -1949,6 +1949,11 @@ class AppWindowToken extends WindowToken implements WindowManagerService.AppFree
         } else if (newTask || !processRunning || (taskSwitch && !activityCreated)) {
             return STARTING_WINDOW_TYPE_SPLASH_SCREEN;
         } else if (taskSwitch && allowTaskSnapshot) {
+            if (mWmService.mLowRamTaskSnapshots) {
+                // For low RAM devices, we use the splash screen starting window instead of the
+                // task snapshot starting window.
+                return STARTING_WINDOW_TYPE_SPLASH_SCREEN;
+            }
             return snapshot == null ? STARTING_WINDOW_TYPE_NONE
                     : snapshotOrientationSameAsTask(snapshot) || fromRecents
                             ? STARTING_WINDOW_TYPE_SNAPSHOT : STARTING_WINDOW_TYPE_SPLASH_SCREEN;
diff --git a/services/core/java/com/android/server/wm/WindowManagerService.java b/services/core/java/com/android/server/wm/WindowManagerService.java
index b6a4a51c41f2..f5f55e2ebf73 100644
--- a/services/core/java/com/android/server/wm/WindowManagerService.java
+++ b/services/core/java/com/android/server/wm/WindowManagerService.java
@@ -433,6 +433,12 @@ public class WindowManagerService extends IWindowManager.Stub
     final long mDrawLockTimeoutMillis;
     final boolean mAllowAnimationsInLowPowerMode;
 
+    /**
+     * Use very low resolution task snapshots. Replaces task snapshot starting windows with
+     * splashscreen starting windows. Used on low RAM devices to save memory.
+     */
+    final boolean mLowRamTaskSnapshots;
+
     final boolean mAllowBootMessages;
 
     final boolean mLimitedAlphaCompositing;
@@ -949,6 +955,8 @@ public class WindowManagerService extends IWindowManager.Stub
                 com.android.internal.R.bool.config_disableTransitionAnimation);
         mPerDisplayFocusEnabled = context.getResources().getBoolean(
                 com.android.internal.R.bool.config_perDisplayFocusEnabled);
+        mLowRamTaskSnapshots = context.getResources().getBoolean(
+                com.android.internal.R.bool.config_lowRamTaskSnapshotsAndRecents);
         mInputManager = inputManager; // Must be before createDisplayContentLocked.
         mDisplayManagerInternal = LocalServices.getService(DisplayManagerInternal.class);
         mDisplayWindowSettings = new DisplayWindowSettings(this);