Early wake-up for transitions (1/2)
On some devices it's very likely that we fall into GL comp during
app transitions. However, SF offsets are chosen in a way such that
the time to finish a frame is just too tight to be completely jank
free when hitting GL composition in SurfaceFlinger. Thus, we
introduce the concept of a separate early offset, and wakeup
SurfaceFlinger at that time if we think that hitting GL comp is
likely, or we already hit GL comp in the last frame.
Test: Open app, check vsync offsets in systrace
Test: Open many dialogs/apps to fall into GPU comp.
Bug: 75985430
Change-Id: Ie17e30c4575359fa11bb8912f68dcafe3e569ddb
diff --git a/services/surfaceflinger/DispSync.h b/services/surfaceflinger/DispSync.h
index 9336f4d..077256a 100644
--- a/services/surfaceflinger/DispSync.h
+++ b/services/surfaceflinger/DispSync.h
@@ -113,6 +113,11 @@
// DispSync object.
status_t removeEventListener(Callback* callback);
+ // changePhaseOffset changes the phase offset of an already-registered event callback. The
+ // method will make sure that there is no skipping or double-firing on the listener per frame,
+ // even when changing the offsets multiple times.
+ status_t changePhaseOffset(Callback* callback, nsecs_t phase);
+
// computeNextRefresh computes when the next refresh is expected to begin.
// The periodOffset value can be used to move forward or backward; an
// offset of zero is the next refresh, -1 is the previous refresh, 1 is