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

1 files changed, 11 insertions, 1 deletions

diff --git a/libs/gui/BufferQueueProducer.cpp b/libs/gui/BufferQueueProducer.cpp
index 9d4246482c..e065e6151d 100644
--- a/libs/gui/BufferQueueProducer.cpp
+++ b/libs/gui/BufferQueueProducer.cpp
@@ -806,8 +806,8 @@ status_t BufferQueueProducer::queueBuffer(int slot,
                 mCore->mDequeueBufferCannotBlock ||
                 (mCore->mSingleBufferMode && mCore->mSingleBufferSlot == slot);
         item.mSurfaceDamage = surfaceDamage;
-        item.mSingleBufferMode = mCore->mSingleBufferMode;
         item.mQueuedBuffer = true;
+        item.mAutoRefresh = mCore->mSingleBufferMode && mCore->mAutoRefresh;
 
         mStickyTransform = stickyTransform;
 
@@ -1309,6 +1309,16 @@ status_t BufferQueueProducer::setSingleBufferMode(bool singleBufferMode) {
     return NO_ERROR;
 }
 
+status_t BufferQueueProducer::setAutoRefresh(bool autoRefresh) {
+    ATRACE_CALL();
+    BQ_LOGV("setAutoRefresh: %d", autoRefresh);
+
+    Mutex::Autolock lock(mCore->mMutex);
+
+    mCore->mAutoRefresh = autoRefresh;
+    return NO_ERROR;
+}
+
 status_t BufferQueueProducer::setDequeueTimeout(nsecs_t timeout) {
     ATRACE_CALL();
     BQ_LOGV("setDequeueTimeout: %" PRId64, timeout);