IconGenerator.cs

using System;
using System.IO;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;

namespace WindowsPrivacyTools
{
    public static class IconGenerator
    {
        public static void GenerateIconIfMissing()
        {
            string iconPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "wp.ico");
            if (File.Exists(iconPath)) return;

            try
            {
                var dv = new DrawingVisual();
                using (var ctx = dv.RenderOpen())
                {
                    // Background
                    ctx.DrawRectangle(
                        new SolidColorBrush(Color.FromRgb(0x18, 0x18, 0x25)),
                        null, new Rect(0, 0, 64, 64));

                    // Outer circle
                    ctx.DrawEllipse(
                        new SolidColorBrush(Color.FromRgb(0x89, 0xB4, 0xFA)),
                        null, new Point(32, 32), 28, 28);

                    // Inner dark circle
                    ctx.DrawEllipse(
                        new SolidColorBrush(Color.FromRgb(0x18, 0x18, 0x25)),
                        null, new Point(32, 32), 22, 22);

                    // WP text
                    var ft = new FormattedText("WP",
                        System.Globalization.CultureInfo.InvariantCulture,
                        FlowDirection.LeftToRight,
                        new Typeface(new FontFamily("Segoe UI"), FontStyles.Normal, FontWeights.Bold, FontStretches.Normal),
                        20,
                        new SolidColorBrush(Color.FromRgb(0x89, 0xB4, 0xFA)),
                        96);
                    ft.TextAlignment = TextAlignment.Center;
                    ctx.DrawText(ft, new Point(32, 22));
                }

                var rtb = new RenderTargetBitmap(64, 64, 96, 96, PixelFormats.Pbgra32);
                rtb.Render(dv);

                string tempPng = Path.Combine(Path.GetTempPath(), "wp_icon_temp.png");
                var encoder = new PngBitmapEncoder();
                encoder.Frames.Add(BitmapFrame.Create(rtb));
                using (var fs = File.Create(tempPng))
                    encoder.Save(fs);

                byte[] pngData = File.ReadAllBytes(tempPng);
                CreateIcoFile(iconPath, pngData, 64, 64);
                File.Delete(tempPng);
            }
            catch { }
        }

        private static void CreateIcoFile(string icoPath, byte[] pngData, int width, int height)
        {
            using var fs = File.Create(icoPath);
            using var bw = new BinaryWriter(fs);

            bw.Write((ushort)0);
            bw.Write((ushort)1);
            bw.Write((ushort)1);

            bw.Write((byte)(width > 255 ? 0 : width));
            bw.Write((byte)(height > 255 ? 0 : height));
            bw.Write((byte)0);
            bw.Write((byte)0);
            bw.Write((ushort)1);
            bw.Write((ushort)32);
            bw.Write(pngData.Length);
            bw.Write(6 + 16);

            bw.Write(pngData);
        }
    }
}