diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardView.java b/java/src/com/android/inputmethod/keyboard/KeyboardView.java
index 61ed26b06..6d9f0139c 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardView.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardView.java
@@ -919,15 +919,14 @@ public class KeyboardView extends View implements PointerTracker.DrawingProxy {
         if (mPreviewPlacer == null) {
             createPreviewPlacer();
         }
-        final Rect r = tracker.getDrawingRect();
+        final Rect r = tracker.getBoundingBox();
         if (!r.isEmpty()) {
             // Invalidate the rectangular region encompassing the gesture. This is needed because
             // past points along the gesture will fade and gradually disappear.
             final KeyPreviewDrawParams params = mKeyPreviewDrawParams;
-            mInvalidatedGesturesRect.set(r.left + params.mCoordinates[0] - GESTURE_DRAWING_WIDTH,
-                    r.top + params.mCoordinates[1] - GESTURE_DRAWING_WIDTH,
-                    r.right + params.mCoordinates[0] + GESTURE_DRAWING_WIDTH,
-                    r.bottom + params.mCoordinates[1] + GESTURE_DRAWING_WIDTH);
+            mInvalidatedGesturesRect.set(r);
+            mInvalidatedGesturesRect.offset(params.mCoordinates[0], params.mCoordinates[1]);
+            mInvalidatedGesturesRect.inset(-GESTURE_DRAWING_WIDTH, -GESTURE_DRAWING_WIDTH);
             mPreviewPlacer.invalidate(mInvalidatedGesturesRect);
         } else {
             mPreviewPlacer.invalidate();
diff --git a/java/src/com/android/inputmethod/keyboard/PointerTracker.java b/java/src/com/android/inputmethod/keyboard/PointerTracker.java
index fb795f2cd..9542ee7c4 100644
--- a/java/src/com/android/inputmethod/keyboard/PointerTracker.java
+++ b/java/src/com/android/inputmethod/keyboard/PointerTracker.java
@@ -536,8 +536,8 @@ public class PointerTracker {
     public long getDownTime() {
         return mDownTime;
     }
-    public Rect getDrawingRect() {
-        return mGestureStroke.getDrawingRect();
+    public Rect getBoundingBox() {
+        return mGestureStroke.getBoundingBox();
     }
 
     private Key onDownKey(int x, int y, long eventTime) {
diff --git a/java/src/com/android/inputmethod/keyboard/internal/GestureStroke.java b/java/src/com/android/inputmethod/keyboard/internal/GestureStroke.java
index 6e3295e59..c16b70ef0 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/GestureStroke.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/GestureStroke.java
@@ -199,7 +199,7 @@ public class GestureStroke {
         }
     }
 
-    public Rect getDrawingRect() {
+    public Rect getBoundingBox() {
         return mDrawingRect;
     }
 }