Support SurfaceView synchronization.

Add API for fetching the next frame number to be produced by
a given buffer producer. Add an API to SurfaceComposer to 
defer execution of the current transaction until a given frame number. 
Together these may be used to synchronize app drawing and surface 
control updates.

Change-Id: I8e0f4993332ac0199c768c88581a453fefbaff1d

1 files changed, 13 insertions, 0 deletions

diff --git a/libs/gui/SurfaceControl.cpp b/libs/gui/SurfaceControl.cpp
index 1983027809..a945358cc0 100644
--- a/libs/gui/SurfaceControl.cpp
+++ b/libs/gui/SurfaceControl.cpp
@@ -145,6 +145,13 @@ status_t SurfaceControl::setCrop(const Rect& crop) {
     return mClient->setCrop(mHandle, crop);
 }
 
+status_t SurfaceControl::deferTransactionUntil(sp<IBinder> handle,
+        uint64_t frameNumber) {
+    status_t err = validate();
+    if (err < 0) return err;
+    return mClient->deferTransactionUntil(mHandle, handle, frameNumber);
+}
+
 status_t SurfaceControl::clearLayerFrameStats() const {
     status_t err = validate();
     if (err < 0) return err;
@@ -190,5 +197,11 @@ sp<Surface> SurfaceControl::getSurface() const
     return mSurfaceData;
 }
 
+sp<IBinder> SurfaceControl::getHandle() const
+{
+    Mutex::Autolock lock(mLock);
+    return mHandle;
+}
+
 // ----------------------------------------------------------------------------
 }; // namespace android