From fb55fbb7ecc5ce3552ed28154708ca1d04f8f061 Mon Sep 17 00:00:00 2001
From: Philip Quinn <pquinn@google.com>
Date: Wed, 12 Jul 2023 15:11:37 -0700
Subject: [PATCH] Update motion prediction offset.

The Jetpack motionprediction library calculates a prediction target
based on the minimum display refresh rate (16~18 ms). UX feedback
suggests that we should cap this at 3~4 stylus frames, which
therefore requires a -4 ms offset (1 frame). Clients of the framework
MotionPredictor can control the prediction time directly and can
access predictions further into the future by providing a larger
value.

Bug: 288354672
Test: predictions are visible in the motionprediction test app
Change-Id: I3a489b59b8b2050c64dd31b2a0f75c2238cb432d
---
 .../overlay/frameworks/base/core/res/res/values/config.xml      | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tangorpro/overlay/frameworks/base/core/res/res/values/config.xml b/tangorpro/overlay/frameworks/base/core/res/res/values/config.xml
index 08296c2..15b02f6 100644
--- a/tangorpro/overlay/frameworks/base/core/res/res/values/config.xml
+++ b/tangorpro/overlay/frameworks/base/core/res/res/values/config.xml
@@ -636,7 +636,7 @@
 
     <!-- Enable the system motion prediction model. -->
     <bool name="config_enableMotionPrediction">true</bool>
-    <integer name="config_motionPredictionOffsetNanos">20000000</integer> <!-- 20 ms -->
+    <integer name="config_motionPredictionOffsetNanos">-4000000</integer> <!-- -4 ms -->
 
     <!-- Whether to reset Battery Stats on unplug when the battery level is high. -->
     <bool name="config_batteryStatsResetOnUnplugHighBatteryLevel">false</bool>