SurfaceFlinger: add animation transactions

This change adds a transaction flag for WindowManager to indicate that a
transaction is being used to animate windows around the screen.  SurfaceFlinger
will not allow more than one of these transactions to be outstanding at a time
to prevent the animation "frames" from being dropped.

Bug: 7353840
Change-Id: I6488a6e0e1ed13d27356d2203c9dc766dc6b1759

2 files changed, 5 insertions, 1 deletions

diff --git a/include/gui/ISurfaceComposer.h b/include/gui/ISurfaceComposer.h
index 5d2d8d7..002aafc 100644
--- a/include/gui/ISurfaceComposer.h
+++ b/include/gui/ISurfaceComposer.h
@@ -46,6 +46,7 @@ public:
     // flags for setTransactionState()
     enum {
         eSynchronous = 0x01,
+        eAnimation   = 0x02,
     };
 
     enum {
diff --git a/include/gui/SurfaceComposerClient.h b/include/gui/SurfaceComposerClient.h
index 581ec8d..21d16a9 100644
--- a/include/gui/SurfaceComposerClient.h
+++ b/include/gui/SurfaceComposerClient.h
@@ -101,10 +101,13 @@ public:
 
     //! Open a composer transaction on all active SurfaceComposerClients.
     static void openGlobalTransaction();
-        
+
     //! Close a composer transaction on all active SurfaceComposerClients.
     static void closeGlobalTransaction(bool synchronous = false);
 
+    //! Flag the currently open transaction as an animation transaction.
+    static void setAnimationTransaction();
+
     status_t    hide(SurfaceID id);
     status_t    show(SurfaceID id);
     status_t    setFlags(SurfaceID id, uint32_t flags, uint32_t mask);