// (c) Copyright Microsoft Corporation.
// This source is subject to the Microsoft Permissive License.
// See http://www.microsoft.com/resources/sharedsource/licensingbasics/sharedsourcelicenses.mspx.
// All other rights reserved.

using System.Windows.Media.Effects;

namespace System.Windows.Media.Extensions.Effects
{
#if SILVERLIGHT 
    using UIPropertyMetadata = System.Windows.PropertyMetadata ;      
#endif
    public class BrightExtract : ShaderEffect
    {
        public static readonly DependencyProperty InputProperty =
            ShaderEffect.RegisterPixelShaderSamplerProperty("Input", typeof(BrightExtract), 0);
        public static readonly DependencyProperty ThresholdProperty =
            DependencyProperty.Register("Threshold", typeof(double), typeof(BrightExtract), new UIPropertyMetadata(0.25, PixelShaderConstantCallback(0)));

        private readonly static PixelShader pixelShader = new PixelShader();

        static BrightExtract()
        {
            pixelShader = PixelShaderUtility.LoadPixelShader<BrightExtract>();
        }

        public BrightExtract()
        {
            this.PixelShader = pixelShader;

            // Update each DependencyProperty that's registered with a shader register.  This
            // is needed to ensure the shader gets sent the proper default value.
            UpdateShaderValue(InputProperty);
            UpdateShaderValue(ThresholdProperty);
        }

		[System.ComponentModel.BrowsableAttribute(false)]
        public Brush Input
        {
            get { return (Brush)GetValue(InputProperty); }
            set { SetValue(InputProperty, value); }
        }
        public double Threshold
        {
            get { return (double)GetValue(ThresholdProperty); }
            set { SetValue(ThresholdProperty, value); }
        }
    }
}
