@Override
  public Integer getValue(LottieFrameInfo<Integer> frameInfo) {
    int originalValue = MiscUtils.lerp(
        frameInfo.getStartValue(),
        frameInfo.getEndValue(),
        frameInfo.getInterpolatedKeyframeProgress()
    );
    int newValue = getOffset(frameInfo);
    return originalValue + newValue;
  }
{@link LottieValueCallback} that provides a value offset from the original animation
rather than an absolute value.
lottie/src/main/java/com/airbnb/lottie/value/LottieRelativeIntegerValueCallback.java