Transfer HWC release fences to BufferQueue
After a HWC set, each SurfaceFlinger Layer retrieves the release fence
HWC returned and gives it to the layer's SurfaceTexture. The
SurfaceTexture accumulates the fences into a merged fence until the
next updateTexImage, then passes the merged fence to the BufferQueue
in releaseBuffer.
In a follow-on change, BufferQueue will return the fence along with
the buffer slot in dequeueBuffer. For now, dequeueBuffer waits for the
fence to signal before returning.
The releaseFence default value for BufferQueue::releaseBuffer() is
temporary to avoid transient build breaks with a multi-project
checkin. It'll disappear in the next change.
Change-Id: Iaa9a0d5775235585d9cbf453d3a64623d08013d9
diff --git a/include/ui/Fence.h b/include/ui/Fence.h
index 19d1830..195f2e9 100644
--- a/include/ui/Fence.h
+++ b/include/ui/Fence.h
@@ -39,6 +39,7 @@
: public LightRefBase<Fence>, public Flattenable
{
public:
+ static const sp<Fence> NO_FENCE;
// Construct a new Fence object with an invalid file descriptor. This
// should be done when the Fence object will be set up by unflattening