Lanczos Window Function
[0.5, 0.5] -> 0
[127.33, 44.9] -> 186.995
[259.67, 21.43] -> 47.2907
[12.13, 61.79] -> 0
[89.5, 11] -> 134.247
[128, 128] -> 140.731
[127.255, 128.73] -> 154.581
[-1, -1] -> 0

