From a652dac675fa49ed5c87e4f0598a2a9d559d504b Mon Sep 17 00:00:00 2001
From: Mady Mellor <madym@google.com>
Date: Thu, 11 Aug 2022 17:19:08 -0700
Subject: Add a method in IDreamManager to check if dreaming OR in dream
 preview

Currently there is no signal to identify that dreaming has started
from the 'preview' option in screen saver settings. This adds a
way to query IDreamManager for this state.

Bubbles needs a way to identify this so that they can hide when
the dream preview starts, otherwise it wouldn't be an accurate
preview.

Bug: 240510360
Test: manual - (with the CL on top of this), have some bubbles and
      trigger dream preview, observe that the bubbles hide.
Change-Id: I5f67a8c793970ada05a010c8d36fd4a47b3f8565
---
 core/java/android/service/dreams/IDreamManager.aidl |  2 ++
 .../android/server/dreams/DreamManagerService.java  | 21 +++++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/core/java/android/service/dreams/IDreamManager.aidl b/core/java/android/service/dreams/IDreamManager.aidl
index 3e0deeb556e9..53ae6576ef95 100644
--- a/core/java/android/service/dreams/IDreamManager.aidl
+++ b/core/java/android/service/dreams/IDreamManager.aidl
@@ -35,6 +35,8 @@ interface IDreamManager {
     void testDream(int userId, in ComponentName componentName);
     @UnsupportedAppUsage
     boolean isDreaming();
+    @UnsupportedAppUsage
+    boolean isDreamingOrInPreview();
     void finishSelf(in IBinder token, boolean immediate);
     void startDozing(in IBinder token, int screenState, int screenBrightness);
     void stopDozing(in IBinder token);
diff --git a/services/core/java/com/android/server/dreams/DreamManagerService.java b/services/core/java/com/android/server/dreams/DreamManagerService.java
index 7b60345caf87..4e0489a5c4bc 100644
--- a/services/core/java/com/android/server/dreams/DreamManagerService.java
+++ b/services/core/java/com/android/server/dreams/DreamManagerService.java
@@ -218,6 +218,7 @@ public final class DreamManagerService extends SystemService {
         }, pw, "", 200);
     }
 
+    /** Whether a real dream is occurring. */
     private boolean isDreamingInternal() {
         synchronized (mLock) {
             return mCurrentDreamToken != null && !mCurrentDreamIsPreview
@@ -225,6 +226,13 @@ public final class DreamManagerService extends SystemService {
         }
     }
 
+    /** Whether a real dream, or a dream preview is occurring. */
+    private boolean isDreamingOrInPreviewInternal() {
+        synchronized (mLock) {
+            return mCurrentDreamToken != null && !mCurrentDreamIsWaking;
+        }
+    }
+
     protected void requestStartDreamFromShell() {
         requestDreamInternal();
     }
@@ -694,6 +702,19 @@ public final class DreamManagerService extends SystemService {
             }
         }
 
+        @Override // Binder call
+        public boolean isDreamingOrInPreview() {
+            checkPermission(android.Manifest.permission.READ_DREAM_STATE);
+
+            final long ident = Binder.clearCallingIdentity();
+            try {
+                return isDreamingOrInPreviewInternal();
+            } finally {
+                Binder.restoreCallingIdentity(ident);
+            }
+        }
+
+
         @Override // Binder call
         public void dream() {
             checkPermission(android.Manifest.permission.WRITE_DREAM_STATE);
-- 
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