SF: Predict HWC composition strategy
Asynchronously run ValidateDisplay to determine client composition
strategy. If we can predict that the composition strategy will not
change from frame to frame (for example by looking at whether
the geometry of the layers is changing), the hwc call is run
asynchronously with the gpu composition. If the result of the call is
incorrectly predicted, the gpu composition is rerun.
ValidateDisplay can take multiple milliseconds to complete and by
making it non-blocking in cases where we can predict the strategy
chosen by the hardware, we can jump start the client composition
and shave valuable milliseconds from the frame time.
This feature is disabled by default.
Test: perfetto traces
Bug: 220031739
Change-Id: Ib4dcc0e055d5272c89cfff853211edac73aa449b
diff --git a/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.h b/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.h
index 307da41..e21095a 100644
--- a/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.h
+++ b/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.h
@@ -89,6 +89,9 @@
virtual void dumpAsString(String8& result) const;
virtual void resizeBuffers(const ui::Size&) override;
virtual const sp<Fence>& getClientTargetAcquireFence() const override;
+ // Virtual display surface needs to prepare the frame based on composition type. Skip
+ // any client composition prediction.
+ virtual bool supportsCompositionStrategyPrediction() const override { return false; };
private:
enum Source : size_t {