Darken Color

DarkenColor.cs

namespace DevToolWPF.Utils
{
    public class RadioColorConverter
    {
        private static int RsNormalized(int a, int b)
        {
            return ((a*(((1 << (b)) - 1))/100));
        }

        private static int RsRgbValue(int r, int g, int b)
        {
            const int rsRedShift = 11;
            const int rsRedBits = 5;
            const int rsGreenBits = 6;
            const int rsGreenShift = 5;
            const int rsBlueBits = 5;
            return ((RsNormalized(r, rsRedBits)) << (rsRedShift)) |
                   ((RsNormalized(g, rsGreenBits)) << (rsGreenShift)) |
                   ((RsNormalized(b, rsBlueBits) << (0)));
        }

        public static int ReverseColor(int color)
        {
            var red = color & 0xF800;
            var green = color & 0x7E0;
            var blue = color & 0x1F;

            red = red >> 11;
            green = green >> 5;

            red = 100*red/31;
            green = 100*green/63;
            blue = 100*blue/31;

            red = (red*255/100);
            green = (green*255/100);
            blue = (blue*255/100);

            red = red << 16;
            green = green << 8;

            return red | green | blue;
        }

        public static int CreateColor(int color)
        {
            var red = color & 0xFF0000;
            var green = color & 0x00FF00;
            var blue = color & 0x0000FF;

            red = red >> 16;
            green = green >> 8;

            red = (red*100)/0xFF;
            green = (green*100)/0xFF;
            blue = (blue*100)/0xFF;

            return RsRgbValue(red, green, blue);
        }
    }
}