Fix LUTInterpolator lookup table position calc

BUG: 32830741
Test: running progress bar at 5x duration scale, no flickering
Change-Id: Ie484bdbfdf18bacc4586e36c5142e4523d08bdaa

1 files changed, 2 insertions, 1 deletions

diff --git a/libs/hwui/Interpolator.cpp b/libs/hwui/Interpolator.cpp
index cc47f0052b73..bddb01b97865 100644
--- a/libs/hwui/Interpolator.cpp
+++ b/libs/hwui/Interpolator.cpp
@@ -97,7 +97,8 @@ LUTInterpolator::~LUTInterpolator() {
 }
 
 float LUTInterpolator::interpolate(float input) {
-    float lutpos = input * mSize;
+    // lut position should only be at the end of the table when input is 1f.
+    float lutpos = input * (mSize - 1);
     if (lutpos >= (mSize - 1)) {
         return mValues[mSize - 1];
     }