From a5dcc6c25d38fe63a15f1b5920c439696726d3da Mon Sep 17 00:00:00 2001
From: Teng-Hui Zhu <ztenghui@google.com>
Date: Wed, 30 Mar 2016 11:34:55 -0700
Subject: [PATCH] LUTInterpolator needs to have 2 frame at minimal

Otherwise, it could be having invalid data, here NAN.
Fix:27343522

Change-Id: I5bb17f04c62f268ec633675015ef589be2413338
---
 .../internal/view/animation/FallbackLUTInterpolator.java       | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/core/java/com/android/internal/view/animation/FallbackLUTInterpolator.java b/core/java/com/android/internal/view/animation/FallbackLUTInterpolator.java
index 526e2aef4799d..9e2cbdba44d47 100644
--- a/core/java/com/android/internal/view/animation/FallbackLUTInterpolator.java
+++ b/core/java/com/android/internal/view/animation/FallbackLUTInterpolator.java
@@ -45,7 +45,8 @@ public class FallbackLUTInterpolator implements NativeInterpolatorFactory, TimeI
     private static float[] createLUT(TimeInterpolator interpolator, long duration) {
         long frameIntervalNanos = Choreographer.getInstance().getFrameIntervalNanos();
         int animIntervalMs = (int) (frameIntervalNanos / TimeUtils.NANOS_PER_MS);
-        int numAnimFrames = (int) Math.ceil(((double) duration) / animIntervalMs);
+        // We need 2 frame values as the minimal.
+        int numAnimFrames = Math.max(2, (int) Math.ceil(((double) duration) / animIntervalMs));
         float values[] = new float[numAnimFrames];
         float lastFrame = numAnimFrames - 1;
         for (int i = 0; i < numAnimFrames; i++) {