ANativeWindow: Add NATIVE_WINDOW_BUFFER_AGE query
Adds a NATIVE_WINDOW_BUFFER_AGE query, which returns the age of the
contents of the most recently dequeued buffer as the number of frames
that have elapsed since it was last queued.
Change-Id: Ib6fd62945cb62d1e60133a65beee510363218a23
(cherry picked from commit 19df32cd19b7fd940eef01b9c92a485144263495)
diff --git a/include/system/window.h b/include/system/window.h
index a875427..508ce00 100644
--- a/include/system/window.h
+++ b/include/system/window.h
@@ -267,7 +267,16 @@
* The default data space for the buffers as set by the consumer.
* The values are defined in graphics.h.
*/
- NATIVE_WINDOW_DEFAULT_DATASPACE = 12
+ NATIVE_WINDOW_DEFAULT_DATASPACE = 12,
+
+ /*
+ * Returns the age of the contents of the most recently dequeued buffer as
+ * the number of frames that have elapsed since it was last queued. For
+ * example, if the window is double-buffered, the age of any given buffer in
+ * steady state will be 2. If the dequeued buffer has never been queued, its
+ * age will be 0.
+ */
+ NATIVE_WINDOW_BUFFER_AGE = 13,
};
/* Valid operations for the (*perform)() hook.