fix [2068105] implement queueBuffer/lockBuffer/dequeueBuffer properly

Rewrote SurfaceFlinger's buffer management from the ground-up.
The design now support an arbitrary number of buffers per surface, however the current implementation is limited to four. Currently only 2 buffers are used in practice.

The main new feature is to be able to dequeue all buffers at once (very important when there are only two). 

A client can dequeue all buffers until there are none available, it can lock all buffers except the last one that is used for composition. The client will block then, until a new buffer is enqueued.

The current implementation requires that buffers are locked in the same order they are dequeued and enqueued in the same order they are locked. Only one buffer can be locked at a time.

eg. Allowed sequence:   DQ, DQ, LOCK, Q, LOCK, Q
eg. Forbidden sequence: DQ, DQ, LOCK, LOCK, Q, Q

1 files changed, 3 insertions, 6 deletions

diff --git a/libs/surfaceflinger/SurfaceFlinger.h b/libs/surfaceflinger/SurfaceFlinger.h
index 69e2f2e..f207f85 100644
--- a/libs/surfaceflinger/SurfaceFlinger.h
+++ b/libs/surfaceflinger/SurfaceFlinger.h
@@ -34,7 +34,7 @@
 #include <ui/ISurfaceComposer.h>
 #include <ui/ISurfaceFlingerClient.h>
 
-#include <private/ui/SharedState.h>
+#include <private/ui/SharedBufferStack.h>
 #include <private/ui/LayerState.h>
 
 #include "Barrier.h"
@@ -87,7 +87,7 @@ public:
     }
     
     // pointer to this client's control block
-    per_client_cblk_t*      ctrlblk;
+    SharedClient*           ctrlblk;
     ClientID                cid;
 
     
@@ -268,8 +268,6 @@ private:
             bool        lockPageFlip(const LayerVector& currentLayers);
             void        unlockPageFlip(const LayerVector& currentLayers);
             void        handleRepaint();
-            void        scheduleBroadcast(const sp<Client>& client);
-            void        executeScheduledBroadcasts();
             void        postFramebuffer();
             void        composeSurfaces(const Region& dirty);
             void        unlockClients();
@@ -313,6 +311,7 @@ private:
     volatile    int32_t                 mTransactionFlags;
     volatile    int32_t                 mTransactionCount;
                 Condition               mTransactionCV;
+                bool                    mResizeTransationPending;
                 
                 // protected by mStateLock (but we could use another lock)
                 Tokenizer                               mTokens;
@@ -337,8 +336,6 @@ private:
                 Region                      mDirtyRegionRemovedLayer;
                 Region                      mInvalidRegion;
                 Region                      mWormholeRegion;
-                wp<Client>                  mLastScheduledBroadcast;
-                SortedVector< wp<Client> >  mScheduledBroadcasts;
                 bool                        mVisibleRegionsDirty;
                 bool                        mDeferReleaseConsole;
                 bool                        mFreezeDisplay;