commit ff95aabbcc6e8606acbd7933c90eeb9b8b382a21
author Pablo Ceballos <pceballos@google.com> Wed Jan 13 17:09:58 2016 -0800
committer Pablo Ceballos <pceballos@google.com> Tue Feb 09 17:16:33 2016 -0800
tree cd7690fdf21486139cfff232c6ce09132d18a05b
parent c5cec281654c5dee2273ce4bebd3a749c3a1119e

Add interface for controlling single buffer auto refresh

- Adds a boolean to BufferQueue that controls whether or not auto
  refresh is enabled in SurfaceFlinger when in single buffer mode.
- Adds plumbing up to ANativeWindow.
- When enabled, it will cache the shared buffer slot in Surface in
  order to prevent the Binder transaction with SurfaceFlinger.

Bug 24940410

Change-Id: I83142afdc00e203f198a32288f071d926f8fda95

libs/gui/BufferQueueConsumer.cpp

diff --git a/libs/gui/BufferQueueConsumer.cpp b/libs/gui/BufferQueueConsumer.cpp
index 92285e5..f8b50cc 100644
--- a/libs/gui/BufferQueueConsumer.cpp
+++ b/libs/gui/BufferQueueConsumer.cpp
@@ -67,7 +67,7 @@
         }
 
         bool sharedBufferAvailable = mCore->mSingleBufferMode &&
-                mCore->mSingleBufferSlot !=
+                mCore->mAutoRefresh && mCore->mSingleBufferSlot !=
                 BufferQueueCore::INVALID_BUFFER_SLOT;
 
         // In asynchronous mode the list is guaranteed to be one buffer deep,
@@ -214,16 +214,15 @@
                     (mCore->mSingleBufferCache.transform &
                     NATIVE_WINDOW_TRANSFORM_INVERSE_DISPLAY) != 0;
             outBuffer->mSurfaceDamage = Region::INVALID_REGION;
-            outBuffer->mSingleBufferMode = true;
             outBuffer->mQueuedBuffer = false;
             outBuffer->mIsStale = false;
+            outBuffer->mAutoRefresh = mCore->mSingleBufferMode &&
+                    mCore->mAutoRefresh;
         } else {
             slot = front->mSlot;
             *outBuffer = *front;
         }
 
-        outBuffer->mSingleBufferMode = mCore->mSingleBufferMode;
-
         ATRACE_BUFFER_INDEX(slot);
 
         BQ_LOGV("acquireBuffer: acquiring { slot=%d/%" PRIu64 " buffer=%p }",