mirror of https://github.com/SixLabors/ImageSharp
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
34 lines
901 B
34 lines
901 B
// <copyright file="Lanczos8Resampler.cs" company="James Jackson-South">
|
|
// Copyright (c) James Jackson-South and contributors.
|
|
// Licensed under the Apache License, Version 2.0.
|
|
// </copyright>
|
|
|
|
namespace ImageProcessorCore
|
|
{
|
|
/// <summary>
|
|
/// The function implements the Lanczos kernel algorithm as described on
|
|
/// <see href="https://en.wikipedia.org/wiki/Lanczos_resampling#Algorithm">Wikipedia</see>
|
|
/// with a radius of 8 pixels.
|
|
/// </summary>
|
|
public class Lanczos8Resampler : IResampler
|
|
{
|
|
/// <inheritdoc/>
|
|
public float Radius => 8;
|
|
|
|
/// <inheritdoc/>
|
|
public float GetValue(float x)
|
|
{
|
|
if (x < 0)
|
|
{
|
|
x = -x;
|
|
}
|
|
|
|
if (x < 8)
|
|
{
|
|
return ImageMaths.SinC(x) * ImageMaths.SinC(x / 8f);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|