SurfaceFlinger: Add TrustedPresentationListener API
TrustedPresentationListener is intended to allow the producer
of a buffer layer to gain a trusted signal on whether and to
what extent a layer is presented. A strawman design would be to
provide the producer details on it's presentation (alpha,
position, scale, final crop, covered region, etc). In the strawman
design the client end would then decide itself whether each of these
parameters were in an acceptable range.
However providing the client feedback on it's per frame position would have
a negative system health impact. Furthermore in some of the target use cases
we can't even be sure the layer of interest is actively producing buffers
and so there may be no existing callback to piggy-back on.
Because of this we use a server side thresholding approach, where the client
expresses some visibility threshold and a time stability constraint. See
SurfaceComposerClient.h comment for details on these thresholds and their
computation.
Bug: 256993331
Test: LayerTrustedPresentationListener_test.cpp
Change-Id: If4bef60dc6b22ce4959c353fa2a19b0994a00f5c
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index 33f0402..b52dc82 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -313,6 +313,8 @@
// TODO(b/246793311): Clean up a temporary property
bool mIgnoreHwcPhysicalDisplayOrientation = false;
+ void forceFutureUpdate(int delayInMs);
+
protected:
// We're reference counted, never destroy SurfaceFlinger directly
virtual ~SurfaceFlinger();
@@ -926,7 +928,7 @@
/*
* Compositing
*/
- void postComposition() REQUIRES(kMainThreadContext);
+ void postComposition(nsecs_t callTime) REQUIRES(kMainThreadContext);
/*
* Display management
@@ -1274,6 +1276,8 @@
float mDimmingRatio = -1.f;
std::unique_ptr<renderengine::RenderEngine> mRenderEngine;
+ std::atomic<int> mNumTrustedPresentationListeners = 0;
+
std::unique_ptr<compositionengine::CompositionEngine> mCompositionEngine;
// mMaxRenderTargetSize is only set once in init() so it doesn't need to be protected by
// any mutex.