commit b7f1556da4ab044563abbc9e126a6abcf4435747
author Ady Abraham <adyabr@google.com> Mon Mar 15 18:34:08 2021 -0700
committer Ady Abraham <adyabr@google.com> Tue Mar 16 01:35:35 2021 +0000
tree 1275b14310abb1f867f384ae1744864459e27439
parent 99ebe3f9f63602d22d6f1028b2996bac6665dd07

SF: pass the predicted present time to LayerHistory

If the predicted present time, according to the frame timeline vsync id,
is known, pass it to LayerHistory so we could heuristically detect
the frame rate of those layers. This is primarly used for TextureView
based media players.

Bug: 181849694
Test: TBD
Change-Id: I4e1d8a0d9c8279c64a514b1f24f4b802e0e9188d

services/surfaceflinger/BufferStateLayer.cpp

diff --git a/services/surfaceflinger/BufferStateLayer.cpp b/services/surfaceflinger/BufferStateLayer.cpp
index 96a0c3c..462e274 100644
--- a/services/surfaceflinger/BufferStateLayer.cpp
+++ b/services/surfaceflinger/BufferStateLayer.cpp
@@ -375,7 +375,16 @@
     mCurrentState.desiredPresentTime = desiredPresentTime;
     mCurrentState.isAutoTimestamp = isAutoTimestamp;
 
-    mFlinger->mScheduler->recordLayerHistory(this, isAutoTimestamp ? 0 : desiredPresentTime,
+    const nsecs_t presentTime = [&] {
+        if (!isAutoTimestamp) return desiredPresentTime;
+
+        const auto prediction =
+                mFlinger->mFrameTimeline->getTokenManager()->getPredictionsForToken(info.vsyncId);
+        if (prediction.has_value()) return prediction->presentTime;
+
+        return static_cast<nsecs_t>(0);
+    }();
+    mFlinger->mScheduler->recordLayerHistory(this, presentTime,
                                              LayerHistory::LayerUpdateType::Buffer);
 
     addFrameEvent(acquireFence, postTime, isAutoTimestamp ? 0 : desiredPresentTime);