ANativeWindow: add queues-to-window-composer check.

This change adds a new 'method' to the ANativeWindow interface to check
whether buffers queued to the window will be sent directly to the system
window compositor.

Change-Id: I4d4b199e328c110b68b250029aea650f03c8724d
Bug: 3495535

2 files changed, 21 insertions, 1 deletions

diff --git a/include/surfaceflinger/ISurfaceComposer.h b/include/surfaceflinger/ISurfaceComposer.h
index 361e7dc..dea1b10 100644
--- a/include/surfaceflinger/ISurfaceComposer.h
+++ b/include/surfaceflinger/ISurfaceComposer.h
@@ -138,6 +138,10 @@ public:
      * This is an ASYNCHRONOUS call.
      */
     virtual void signal() const = 0;
+
+    /* verify that an ISurface was created by SurfaceFlinger.
+     */
+    virtual bool authenticateSurface(const sp<ISurface>& surface) const = 0;
 };
 
 // ----------------------------------------------------------------------------
@@ -161,7 +165,8 @@ public:
         SIGNAL,
         CAPTURE_SCREEN,
         TURN_ELECTRON_BEAM_OFF,
-        TURN_ELECTRON_BEAM_ON
+        TURN_ELECTRON_BEAM_ON,
+        AUTHENTICATE_SURFACE,
     };
 
     virtual status_t    onTransact( uint32_t code,
diff --git a/include/ui/egl/android_natives.h b/include/ui/egl/android_natives.h
index fd83f46..0ac34d0 100644
--- a/include/ui/egl/android_natives.h
+++ b/include/ui/egl/android_natives.h
@@ -95,6 +95,21 @@ enum {
      * 5. Queue, dequeue, queue, dequeue, ad infinitum
      */
     NATIVE_WINDOW_MIN_UNDEQUEUED_BUFFERS,
+
+    /* Check whether queueBuffer operations on the ANativeWindow send the buffer
+     * to the window compositor.  The query sets the returned 'value' argument
+     * to 1 if the ANativeWindow DOES send queued buffers directly to the window
+     * compositor and 0 if the buffers do not go directly to the window
+     * compositor.
+     *
+     * This can be used to determine whether protected buffer content should be
+     * sent to the ANativeWindow.  Note, however, that a result of 1 does NOT
+     * indicate that queued buffers will be protected from applications or users
+     * capturing their contents.  If that behavior is desired then some other
+     * mechanism (e.g. the GRALLOC_USAGE_PROTECTED flag) should be used in
+     * conjunction with this query.
+     */
+    NATIVE_WINDOW_QUEUES_TO_WINDOW_COMPOSER,
 };
 
 /* valid operations for the (*perform)() hook */