From 20aeddd853c3681ee31a34a7228979689eda5b63 Mon Sep 17 00:00:00 2001
From: Winson Chung <winsonc@google.com>
Date: Fri, 17 Apr 2020 16:16:44 -0700
Subject: [PATCH] Dedupe non-perceptable depth updates

Bug: 154304487
Change-Id: I6d96aca555932f4a51aed576d25f7150952bb562
---
 .../android/launcher3/statehandlers/DepthController.java | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/quickstep/src/com/android/launcher3/statehandlers/DepthController.java b/quickstep/src/com/android/launcher3/statehandlers/DepthController.java
index f83737ef9f..5f5d6dc1f9 100644
--- a/quickstep/src/com/android/launcher3/statehandlers/DepthController.java
+++ b/quickstep/src/com/android/launcher3/statehandlers/DepthController.java
@@ -177,7 +177,14 @@ public class DepthController implements LauncherStateManager.StateHandler {
     }
 
     private void setDepth(float depth) {
-        mDepth = depth;
+        // Round out the depth to dedupe frequent, non-perceptable updates
+        int depthI = (int) (depth * 256);
+        float depthF = depthI / 256f;
+        if (Float.compare(mDepth, depthF) == 0) {
+            return;
+        }
+
+        mDepth = depthF;
         if (mSurface == null || !mSurface.isValid()) {
             return;
         }