Add config to force display to transition to off after doze

Some display hardware can't do the transition from doze display states
to the on display state cleanly, so in order to hide any janky-ness of
the transition we force the display off and cover the screen with a
black surface. This lets us keep the screen black until SystemUI and the
display are both ready.

Bug: 63531607
Test: manual
Change-Id: I66bd483e5f01e1dbd5069465aa122828af5f1903

1 files changed, 9 insertions, 0 deletions

diff --git a/core/java/android/view/Display.java b/core/java/android/view/Display.java
index 7346a215ed8e..263d3ff423c5 100644
--- a/core/java/android/view/Display.java
+++ b/core/java/android/view/Display.java
@@ -1133,6 +1133,15 @@ public final class Display {
     }
 
     /**
+     * Returns true if the display may be in a reduced operating mode while in the
+     * specified display power state.
+     * @hide
+     */
+    public static boolean isDozeState(int state) {
+        return state == STATE_DOZE || state == STATE_DOZE_SUSPEND;
+    }
+
+    /**
      * A mode supported by a given display.
      *
      * @see Display#getSupportedModes()