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

1 files changed, 22 insertions, 1 deletions

diff --git a/libs/gui/SurfaceComposerClient.cpp b/libs/gui/SurfaceComposerClient.cpp
index 3efd086..8586ed2 100644
--- a/libs/gui/SurfaceComposerClient.cpp
+++ b/libs/gui/SurfaceComposerClient.cpp
@@ -115,12 +115,15 @@ class Composer : public Singleton<Composer>
     SortedVector<ComposerState> mComposerStates;
     SortedVector<DisplayState > mDisplayStates;
     uint32_t                    mForceSynchronous;
+    bool                        mAnimation;
 
     Composer() : Singleton<Composer>(),
-        mForceSynchronous(0)
+        mForceSynchronous(0),
+        mAnimation(false)
     { }
 
     void closeGlobalTransactionImpl(bool synchronous);
+    void setAnimationTransactionImpl();
 
     layer_state_t* getLayerStateLocked(
             const sp<SurfaceComposerClient>& client, SurfaceID id);
@@ -159,6 +162,10 @@ public:
             const Rect& layerStackRect,
             const Rect& displayRect);
 
+    static void setAnimationTransaction() {
+        Composer::getInstance().setAnimationTransactionImpl();
+    }
+
     static void closeGlobalTransaction(bool synchronous) {
         Composer::getInstance().closeGlobalTransactionImpl(synchronous);
     }
@@ -194,12 +201,22 @@ void Composer::closeGlobalTransactionImpl(bool synchronous) {
         if (synchronous || mForceSynchronous) {
             flags |= ISurfaceComposer::eSynchronous;
         }
+        if (mAnimation) {
+            flags |= ISurfaceComposer::eAnimation;
+        }
+
         mForceSynchronous = false;
+        mAnimation = false;
     }
 
    sm->setTransactionState(transaction, displayTransaction, flags);
 }
 
+void Composer::setAnimationTransactionImpl() {
+    Mutex::Autolock _l(mLock);
+    mAnimation = true;
+}
+
 layer_state_t* Composer::getLayerStateLocked(
         const sp<SurfaceComposerClient>& client, SurfaceID id) {
 
@@ -471,6 +488,10 @@ void SurfaceComposerClient::closeGlobalTransaction(bool synchronous) {
     Composer::closeGlobalTransaction(synchronous);
 }
 
+void SurfaceComposerClient::setAnimationTransaction() {
+    Composer::setAnimationTransaction();
+}
+
 // ----------------------------------------------------------------------------
 
 status_t SurfaceComposerClient::setCrop(SurfaceID id, const Rect& crop) {