SurfaceFlinger: Layer::shouldPresentNow should consider early frames
Move the decision whether to latch a buffer or not based on
the expected present time (that is whether a frame is considered too
early or out of vsync phase) from Layer::latchBuffer to
Layer::shouldPresentNow as the code assumes that Layer::latchBuffer would
not fail based on the expected present.
Bug: 176755514
Bug: 176416352
Test: atest CtsViewTestCases:android.view.cts.ASurfaceControlTest
Test: atest FrameRateOverrideHostTest
Change-Id: Ib83bda41c824549011f12fa5414263c8b03032e4
diff --git a/services/surfaceflinger/BufferLayer.h b/services/surfaceflinger/BufferLayer.h
index 5cd9a7c..2118f4a 100644
--- a/services/surfaceflinger/BufferLayer.h
+++ b/services/surfaceflinger/BufferLayer.h
@@ -175,12 +175,24 @@
void setTransformHint(ui::Transform::RotationFlags displayTransformHint) override;
// Transform hint provided to the producer. This must be accessed holding
- /// the mStateLock.
+ // the mStateLock.
ui::Transform::RotationFlags mTransformHint = ui::Transform::ROT_0;
bool getAutoRefresh() const { return mAutoRefresh; }
bool getSidebandStreamChanged() const { return mSidebandStreamChanged; }
+ // Returns true if the next buffer should be presented at the expected present time
+ bool shouldPresentNow(nsecs_t expectedPresentTime) const final;
+
+ // Returns true if the next buffer should be presented at the expected present time,
+ // overridden by BufferStateLayer and BufferQueueLayer for implementation
+ // specific logic
+ virtual bool isBufferDue(nsecs_t /*expectedPresentTime*/) const = 0;
+
+ // Returns true if the next frame is considered too early to present
+ // at the given expectedPresentTime
+ bool frameIsEarly(nsecs_t expectedPresentTime) const;
+
std::atomic<bool> mAutoRefresh{false};
std::atomic<bool> mSidebandStreamChanged{false};
@@ -225,13 +237,8 @@
FloatRect computeSourceBounds(const FloatRect& parentBounds) const override;
- // Returns true if the next frame is considered too early to present
- // at the given expectedPresentTime
- bool frameIsEarly(nsecs_t expectedPresentTime) const;
-
- // Returns the predicted present time of the next frame if available or
- // 0 otherwise.
- virtual nsecs_t nextPredictedPresentTime() const = 0;
+ // Returns the predicted present time of the next frame if available
+ virtual std::optional<nsecs_t> nextPredictedPresentTime() const = 0;
// The amount of time SF can delay a frame if it is considered early based
// on the VsyncModulator::VsyncConfig::appWorkDuration