commit 05a4c9e19a63cf8a91356371d8f6a216fd20e405
author The Android Open Source Project <initial-contribution@android.com> Mon Oct 05 21:00:27 2020 -0700
committer Xin Li <delphij@google.com> Tue Oct 06 16:53:21 2020 +0000
tree c85594bb7036e098a07b450f9f7d35de567de85b
parent 41e7da247f2a055ff936135023d3b81492e33d10
parent 8f78892826c164898bec2077667a1ae6bd4981da

DO NOT MERGE - Merge RP1A.201005.006

Bug: 168212094
Merged-In: Idef112187f34a18feea7e6a0b77258626f9d0ed4
Change-Id: Ibab48c1925a0ab7a80ddcaba45a7b73219bb0b0a

quickstep/src/com/android/quickstep/util/MotionPauseDetector.java

diff --git a/quickstep/src/com/android/quickstep/util/MotionPauseDetector.java b/quickstep/src/com/android/quickstep/util/MotionPauseDetector.java
index a5d4568..f60f7ad 100644
--- a/quickstep/src/com/android/quickstep/util/MotionPauseDetector.java
+++ b/quickstep/src/com/android/quickstep/util/MotionPauseDetector.java
@@ -276,7 +276,7 @@
         private static final int HISTORY_SIZE = 20;
 
         // Position history are stored in a circular array
-        private final float[] mHistoricTimes = new float[HISTORY_SIZE];
+        private final long[] mHistoricTimes = new long[HISTORY_SIZE];
         private final float[] mHistoricPos = new float[HISTORY_SIZE];
         private int mHistoryCount = 0;
         private int mHistoryStart = 0;
@@ -292,7 +292,7 @@
             mHistoryCount = mHistoryStart = 0;
         }
 
-        private void addPositionAndTime(float eventTime, float eventPosition) {
+        private void addPositionAndTime(long eventTime, float eventPosition) {
             mHistoricTimes[mHistoryStart] = eventTime;
             mHistoricPos[mHistoryStart] = eventPosition;
             mHistoryStart++;
@@ -322,7 +322,7 @@
          * Based on solveUnweightedLeastSquaresDeg2 in VelocityTracker.cpp
          */
         private Float solveUnweightedLeastSquaresDeg2(final int pointPos) {
-            final float eventTime = mHistoricTimes[pointPos];
+            final long eventTime = mHistoricTimes[pointPos];
 
             float sxi = 0, sxiyi = 0, syi = 0, sxi2 = 0, sxi3 = 0, sxi2yi = 0, sxi4 = 0;
             int count = 0;
@@ -332,8 +332,8 @@
                     index += HISTORY_SIZE;
                 }
 
-                float time = mHistoricTimes[index];
-                float age = eventTime - time;
+                long time = mHistoricTimes[index];
+                long age = eventTime - time;
                 if (age > HORIZON_MS) {
                     break;
                 }
@@ -358,18 +358,23 @@
 
             if (count < 3) {
                 // Too few samples
-                if (count == 2) {
-                    int endPos = pointPos - 1;
-                    if (endPos < 0) {
-                        endPos += HISTORY_SIZE;
+                switch (count) {
+                    case 2: {
+                        int endPos = pointPos - 1;
+                        if (endPos < 0) {
+                            endPos += HISTORY_SIZE;
+                        }
+                        long denominator = eventTime - mHistoricTimes[endPos];
+                        if (denominator != 0) {
+                            return (mHistoricPos[pointPos] - mHistoricPos[endPos]) / denominator;
+                        }
                     }
-                    float denominator = eventTime - mHistoricTimes[endPos];
-                    if (denominator != 0) {
-                        return (eventTime - mHistoricPos[endPos]) / denominator;
-
-                    }
+                    // fall through
+                    case 1:
+                        return 0f;
+                    default:
+                        return null;
                 }
-                return null;
             }
 
             float Sxx = sxi2 - sxi * sxi / count;