CentralizedControl/HandyControl/HandyControl_Shared/Media/Effects/BrightnessEffect.cs

using System;
using System.Windows;
using System.Windows.Media.Effects;
using HandyControl.Data;

namespace HandyControl.Media.Effects;

public class BrightnessEffect : EffectBase
{
    private static readonly PixelShader Shader;

    static BrightnessEffect()
    {
        Shader = new PixelShader
        {
            UriSource = new Uri("pack://application:,,,/HandyControl;component/Resources/Effects/BrightnessEffect.ps")
        };
    }

    public BrightnessEffect()
    {
        PixelShader = Shader;

        UpdateShaderValue(InputProperty);
        UpdateShaderValue(BrightnessProperty);
    }

    public static readonly DependencyProperty BrightnessProperty = DependencyProperty.Register(
        nameof(Brightness), typeof(double), typeof(BrightnessEffect), new PropertyMetadata(ValueBoxes.Double1Box, PixelShaderConstantCallback(0)));

    public double Brightness
    {
        get => (double) GetValue(BrightnessProperty);
        set => SetValue(BrightnessProperty, value);
    }
}