Backport showBackground animation API support

Support was only added to shell, adding support in the the legacy transition system

Test: atest CtsWindowManagerDeviceTestCases:AnimationBackgroundTests

Bug: 218686362
Change-Id: I91cd4d22b7058374a7cc96264797d64597f43e84

services/core/java/com/android/server/wm/ActivityClientController.java

@@ -1088,7 +1088,7 @@ class ActivityClientController extends IActivityClientController.Stub {
             final ActivityRecord r = ActivityRecord.isInRootTaskLocked(token);
             if (r != null && r.isState(RESUMED, PAUSING)) {
                 r.mDisplayContent.mAppTransition.overridePendingAppTransition(
-                        packageName, enterAnim, exitAnim, null, null,
+                        packageName, enterAnim, exitAnim, backgroundColor, null, null,
                         r.mOverrideTaskTransition);
                 r.mTransitionController.setOverrideAnimation(
                         TransitionInfo.AnimationOptions.makeCustomAnimOptions(packageName,

services/core/java/com/android/server/wm/ActivityRecord.java

@@ -4485,6 +4485,7 @@ final class ActivityRecord extends WindowToken implements WindowManagerService.A
                         pendingOptions.getPackageName(),
                         pendingOptions.getCustomEnterResId(),
                         pendingOptions.getCustomExitResId(),
+                        pendingOptions.getCustomBackgroundColor(),
                         pendingOptions.getAnimationStartedListener(),
                         pendingOptions.getAnimationFinishedListener(),
                         pendingOptions.getOverrideTaskTransition());

services/core/java/com/android/server/wm/AnimationAdapter.java

@@ -41,6 +41,22 @@ interface AnimationAdapter {
      */
     boolean getShowWallpaper();
 
+    /**
+     * @return Whether we should show a background behind the animating windows.
+     * @see Animation#getShowBackground()
+     */
+    default boolean getShowBackground() {
+        return false;
+    }
+
+    /**
+     * @return The background color to use during an animation if getShowBackground returns true.
+     * @see Animation#getBackgroundColor()
+     */
+    default int getBackgroundColor() {
+        return 0;
+    }
+
     /**
      * Requests to start the animation.
      *

services/core/java/com/android/server/wm/AppTransition.java

@@ -93,6 +93,7 @@ import static com.android.server.wm.WindowManagerInternal.KeyguardExitAnimationS
 import static com.android.server.wm.WindowStateAnimator.ROOT_TASK_CLIP_AFTER_ANIM;
 import static com.android.server.wm.WindowStateAnimator.ROOT_TASK_CLIP_NONE;
 
+import android.annotation.ColorInt;
 import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.content.ComponentName;
@@ -198,6 +199,7 @@ public class AppTransition implements Dump {
     private IRemoteCallback mAnimationFinishedCallback;
     private int mNextAppTransitionEnter;
     private int mNextAppTransitionExit;
+    private @ColorInt int mNextAppTransitionBackgroundColor;
     private int mNextAppTransitionInPlace;
     private boolean mNextAppTransitionIsSync;
 
@@ -829,6 +831,7 @@ public class AppTransition implements Dump {
                     break;
             }
             a = animAttr != 0 ? loadAnimationAttr(lp, animAttr, transit) : null;
+
             ProtoLog.v(WM_DEBUG_APP_TRANSITIONS_ANIM,
                     "applyAnimation: anim=%s animAttr=0x%x transit=%s isEntrance=%b "
                             + "Callers=%s",
@@ -836,6 +839,11 @@ public class AppTransition implements Dump {
                     Debug.getCallers(3));
         }
         setAppTransitionFinishedCallbackIfNeeded(a);
+
+        if (mNextAppTransitionBackgroundColor != 0) {
+            a.setBackgroundColor(mNextAppTransitionBackgroundColor);
+        }
+
         return a;
     }
 
@@ -861,14 +869,15 @@ public class AppTransition implements Dump {
     }
 
     void overridePendingAppTransition(String packageName, int enterAnim, int exitAnim,
-            IRemoteCallback startedCallback, IRemoteCallback endedCallback,
-            boolean overrideTaskTransaction) {
+            @ColorInt int backgroundColor, IRemoteCallback startedCallback,
+            IRemoteCallback endedCallback, boolean overrideTaskTransaction) {
         if (canOverridePendingAppTransition()) {
             clear();
             mNextAppTransitionOverrideRequested = true;
             mNextAppTransitionPackage = packageName;
             mNextAppTransitionEnter = enterAnim;
             mNextAppTransitionExit = exitAnim;
+            mNextAppTransitionBackgroundColor = backgroundColor;
             postAnimationCallback();
             mNextAppTransitionCallback = startedCallback;
             mAnimationFinishedCallback = endedCallback;

services/core/java/com/android/server/wm/LocalAnimationAdapter.java

@@ -50,6 +50,16 @@ class LocalAnimationAdapter implements AnimationAdapter {
         return mSpec.getShowWallpaper();
     }
 
+    @Override
+    public boolean getShowBackground() {
+        return mSpec.getShowBackground();
+    }
+
+    @Override
+    public int getBackgroundColor() {
+        return mSpec.getBackgroundColor();
+    }
+
     @Override
     public void startAnimation(SurfaceControl animationLeash, Transaction t,
             @AnimationType int type, @NonNull OnAnimationFinishedCallback finishCallback) {
@@ -96,6 +106,20 @@ class LocalAnimationAdapter implements AnimationAdapter {
             return false;
         }
 
+        /**
+         * @see AnimationAdapter#getShowBackground
+         */
+        default boolean getShowBackground() {
+            return false;
+        }
+
+        /**
+         * @see AnimationAdapter#getBackgroundColor
+         */
+        default int getBackgroundColor() {
+            return 0;
+        }
+
         /**
          * @see AnimationAdapter#getStatusBarTransitionsStartTime
          */

services/core/java/com/android/server/wm/WindowAnimationSpec.java

@@ -79,6 +79,16 @@ public class WindowAnimationSpec implements AnimationSpec {
         return mAnimation.getShowWallpaper();
     }
 
+    @Override
+    public boolean getShowBackground() {
+        return mAnimation.getShowBackground();
+    }
+
+    @Override
+    public int getBackgroundColor() {
+        return mAnimation.getBackgroundColor();
+    }
+
     @Override
     public long getDuration() {
         return mAnimation.computeDurationHint();

services/core/java/com/android/server/wm/WindowContainer.java

@@ -39,6 +39,7 @@ import static com.android.internal.protolog.ProtoLogGroup.WM_DEBUG_ORIENTATION;
 import static com.android.internal.protolog.ProtoLogGroup.WM_DEBUG_SYNC_ENGINE;
 import static com.android.server.policy.WindowManagerPolicy.FINISH_LAYOUT_REDO_WALLPAPER;
 import static com.android.server.wm.AppTransition.MAX_APP_TRANSITION_DURATION;
+import static com.android.server.wm.AppTransition.isActivityTransitOld;
 import static com.android.server.wm.AppTransition.isTaskTransitOld;
 import static com.android.server.wm.DisplayContent.IME_TARGET_LAYERING;
 import static com.android.server.wm.IdentifierProto.HASH_CODE;
@@ -81,7 +82,6 @@ import android.util.Pools;
 import android.util.Slog;
 import android.util.proto.ProtoOutputStream;
 import android.view.DisplayInfo;
-import android.view.InsetsState;
 import android.view.MagnificationSpec;
 import android.view.RemoteAnimationDefinition;
 import android.view.RemoteAnimationTarget;
@@ -98,6 +98,7 @@ import android.window.WindowContainerToken;
 
 import com.android.internal.R;
 import com.android.internal.annotations.VisibleForTesting;
+import com.android.internal.graphics.ColorUtils;
 import com.android.internal.protolog.common.ProtoLog;
 import com.android.internal.util.ToBooleanFunction;
 import com.android.server.wm.SurfaceAnimator.Animatable;
@@ -2816,6 +2817,25 @@ class WindowContainer<E extends WindowContainer> extends ConfigurationContainer<
                 }
             }
 
+            final ActivityRecord activityRecord = asActivityRecord();
+            if (activityRecord != null && isActivityTransitOld(transit)
+                    && adapter.getShowBackground()) {
+                final @ColorInt int backgroundColorForTransition;
+                if (adapter.getBackgroundColor() != 0) {
+                    // If available use the background color provided through getBackgroundColor
+                    // which if set originates from a call to overridePendingAppTransition.
+                    backgroundColorForTransition = adapter.getBackgroundColor();
+                } else {
+                    // Otherwise default to the window's background color if provided through
+                    // the theme as the background color for the animation - the top most window
+                    // with a valid background color and showBackground set takes precedence.
+                    final Task arTask = activityRecord.getTask();
+                    backgroundColorForTransition = ColorUtils.setAlphaComponent(
+                            arTask.getTaskDescription().getBackgroundColor(), 255);
+                }
+                animationRunnerBuilder.setTaskBackgroundColor(backgroundColorForTransition);
+            }
+
             animationRunnerBuilder.build()
                     .startAnimation(getPendingTransaction(), adapter, !isVisible(),
                             ANIMATION_TYPE_APP_TRANSITION, thumbnailAdapter);