Add a flag to virtual display to indicates that content on this

display need to be destroyed once the display is removed.
Then apply this flag to VR virtual display.

Change-Id: Icb5aa1280b6ebac5941afda1cc1b94b258ce44f4
Bug: 67420451
Test: Manually. "adb shell am stack list" does not show contents
from virtual display anymore after it's released.

5 files changed, 24 insertions, 0 deletions

diff --git a/core/java/android/hardware/display/DisplayManager.java b/core/java/android/hardware/display/DisplayManager.java
index 6fbacaf32fd6..ae4f05a2ef94 100644
--- a/core/java/android/hardware/display/DisplayManager.java
+++ b/core/java/android/hardware/display/DisplayManager.java
@@ -278,6 +278,15 @@ public final class DisplayManager {
      */
     public static final int VIRTUAL_DISPLAY_FLAG_ROTATES_WITH_CONTENT = 1 << 7;
 
+    /**
+     * Virtual display flag: Indicates that the contents will be destroyed once
+     * the display is removed.
+     *
+     * @see #createVirtualDisplay
+     * @hide
+     */
+    public static final int VIRTUAL_DISPLAY_FLAG_DESTROY_CONTENT_ON_REMOVAL = 1 << 8;
+
     /** @hide */
     public DisplayManager(Context context) {
         mContext = context;
diff --git a/services/core/java/com/android/server/display/DisplayDeviceInfo.java b/services/core/java/com/android/server/display/DisplayDeviceInfo.java
index ef6de4c1ee51..fddb81ba2af7 100644
--- a/services/core/java/com/android/server/display/DisplayDeviceInfo.java
+++ b/services/core/java/com/android/server/display/DisplayDeviceInfo.java
@@ -98,6 +98,12 @@ final class DisplayDeviceInfo {
     public static final int FLAG_CAN_SHOW_WITH_INSECURE_KEYGUARD = 1 << 9;
 
     /**
+     * Flag: This display will destroy its content on removal.
+     * @hide
+     */
+    public static final int FLAG_DESTROY_CONTENT_ON_REMOVAL = 1 << 10;
+
+    /**
      * Touch attachment: Display does not receive touch.
      */
     public static final int TOUCH_NONE = 0;
diff --git a/services/core/java/com/android/server/display/LogicalDisplay.java b/services/core/java/com/android/server/display/LogicalDisplay.java
index addad0b413a3..78a540790db6 100644
--- a/services/core/java/com/android/server/display/LogicalDisplay.java
+++ b/services/core/java/com/android/server/display/LogicalDisplay.java
@@ -238,6 +238,9 @@ final class LogicalDisplay {
                 // For private displays by default content is destroyed on removal.
                 mBaseDisplayInfo.removeMode = Display.REMOVE_MODE_DESTROY_CONTENT;
             }
+            if ((deviceInfo.flags & DisplayDeviceInfo.FLAG_DESTROY_CONTENT_ON_REMOVAL) != 0) {
+                mBaseDisplayInfo.removeMode = Display.REMOVE_MODE_DESTROY_CONTENT;
+            }
             if ((deviceInfo.flags & DisplayDeviceInfo.FLAG_PRESENTATION) != 0) {
                 mBaseDisplayInfo.flags |= Display.FLAG_PRESENTATION;
             }
diff --git a/services/core/java/com/android/server/display/VirtualDisplayAdapter.java b/services/core/java/com/android/server/display/VirtualDisplayAdapter.java
index d6ab88813f4d..f86d57634bff 100644
--- a/services/core/java/com/android/server/display/VirtualDisplayAdapter.java
+++ b/services/core/java/com/android/server/display/VirtualDisplayAdapter.java
@@ -24,6 +24,8 @@ import static android.hardware.display.DisplayManager.VIRTUAL_DISPLAY_FLAG_PUBLI
 import static android.hardware.display.DisplayManager.VIRTUAL_DISPLAY_FLAG_SECURE;
 import static android.hardware.display.DisplayManager.VIRTUAL_DISPLAY_FLAG_SUPPORTS_TOUCH;
 import static android.hardware.display.DisplayManager.VIRTUAL_DISPLAY_FLAG_ROTATES_WITH_CONTENT;
+import static android.hardware.display.DisplayManager
+        .VIRTUAL_DISPLAY_FLAG_DESTROY_CONTENT_ON_REMOVAL;
 
 import android.content.Context;
 import android.hardware.display.IVirtualDisplayCallback;
@@ -363,6 +365,9 @@ public class VirtualDisplayAdapter extends DisplayAdapter {
                 if ((mFlags & VIRTUAL_DISPLAY_FLAG_ROTATES_WITH_CONTENT) != 0) {
                     mInfo.flags |= DisplayDeviceInfo.FLAG_ROTATES_WITH_CONTENT;
                 }
+                if ((mFlags & VIRTUAL_DISPLAY_FLAG_DESTROY_CONTENT_ON_REMOVAL) != 0) {
+                  mInfo.flags |= DisplayDeviceInfo.FLAG_DESTROY_CONTENT_ON_REMOVAL;
+                }
 
                 mInfo.type = Display.TYPE_VIRTUAL;
                 mInfo.touch = ((mFlags & VIRTUAL_DISPLAY_FLAG_SUPPORTS_TOUCH) == 0) ?
diff --git a/services/core/java/com/android/server/vr/Vr2dDisplay.java b/services/core/java/com/android/server/vr/Vr2dDisplay.java
index 5721415c55f5..95d03d4bda49 100644
--- a/services/core/java/com/android/server/vr/Vr2dDisplay.java
+++ b/services/core/java/com/android/server/vr/Vr2dDisplay.java
@@ -296,6 +296,7 @@ class Vr2dDisplay {
             flags |= DisplayManager.VIRTUAL_DISPLAY_FLAG_ROTATES_WITH_CONTENT;
             flags |= DisplayManager.VIRTUAL_DISPLAY_FLAG_PUBLIC;
             flags |= DisplayManager.VIRTUAL_DISPLAY_FLAG_OWN_CONTENT_ONLY;
+            flags |= DisplayManager.VIRTUAL_DISPLAY_FLAG_DESTROY_CONTENT_ON_REMOVAL;
             mVirtualDisplay = mDisplayManager.createVirtualDisplay(null /* projection */,
                     DISPLAY_NAME, mVirtualDisplayWidth, mVirtualDisplayHeight, mVirtualDisplayDpi,
                     null /* surface */, flags, null /* callback */, null /* handler */,