Add the MIN_UNDEQUEUED_BUFFERS query to ANW.
This change adds a new query to ANativeWindow for getting the minimum
number of buffers that must be left un-dequeued during the steady-state
operation of the ANativeWindow.
Change-Id: Ie8c461fc26b02ecde02ddb4f95bf763662cf1551
Related-Bug: 3356050
diff --git a/include/surfaceflinger/Surface.h b/include/surfaceflinger/Surface.h
index d783caf..9e0b5bb 100644
--- a/include/surfaceflinger/Surface.h
+++ b/include/surfaceflinger/Surface.h
@@ -242,6 +242,10 @@
status_t validate(bool inCancelBuffer = false) const;
sp<ISurface> getISurface() const;
+ // When the buffer pool is a fixed size we want to make sure SurfaceFlinger
+ // won't stall clients, so we require an extra buffer.
+ enum { MIN_UNDEQUEUED_BUFFERS = 2 };
+
inline const GraphicBufferMapper& getBufferMapper() const { return mBufferMapper; }
inline GraphicBufferMapper& getBufferMapper() { return mBufferMapper; }