Android side of the fix for [2121211] Sholes has stutter during animations

a new method, compostionComplete() is added to the framebuffer hal, it is used by surfaceflinger to signal the driver that the composition is complete, BEFORE it releases its client. This gives a chance to the driver to

3 files changed, 8 insertions, 3 deletions

diff --git a/libs/surfaceflinger/DisplayHardware/DisplayHardware.cpp b/libs/surfaceflinger/DisplayHardware/DisplayHardware.cpp
index cc913cb..7bdf885 100644
--- a/libs/surfaceflinger/DisplayHardware/DisplayHardware.cpp
+++ b/libs/surfaceflinger/DisplayHardware/DisplayHardware.cpp
@@ -297,9 +297,9 @@ uint32_t DisplayHardware::getPageFlipCount() const {
     return mPageFlipCount;
 }
 
-/*
- * "Flip" the front and back buffers.
- */
+status_t DisplayHardware::compositionComplete() const {
+    return mNativeWindow->compositionComplete();
+}
 
 void DisplayHardware::flip(const Region& dirty) const
 {
diff --git a/libs/surfaceflinger/DisplayHardware/DisplayHardware.h b/libs/surfaceflinger/DisplayHardware/DisplayHardware.h
index 8972d51..b7f1cdb 100644
--- a/libs/surfaceflinger/DisplayHardware/DisplayHardware.h
+++ b/libs/surfaceflinger/DisplayHardware/DisplayHardware.h
@@ -80,6 +80,8 @@ public:
     EGLDisplay getEGLDisplay() const { return mDisplay; }
     overlay_control_device_t* getOverlayEngine() const { return mOverlayEngine; }
     
+    status_t compositionComplete() const;
+    
     Rect bounds() const {
         return Rect(mWidth, mHeight);
     }
diff --git a/libs/surfaceflinger/SurfaceFlinger.cpp b/libs/surfaceflinger/SurfaceFlinger.cpp
index 31b5128..e87b563 100644
--- a/libs/surfaceflinger/SurfaceFlinger.cpp
+++ b/libs/surfaceflinger/SurfaceFlinger.cpp
@@ -495,6 +495,9 @@ bool SurfaceFlinger::threadLoop()
         // repaint the framebuffer (if needed)
         handleRepaint();
 
+        // inform the h/w that we're done compositing
+        hw.compositionComplete();
+
         // release the clients before we flip ('cause flip might block)
         unlockClients();