fuck you, transes your computer

Program.cs

#define THROW_ON_ERROR

using System;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace Blitter {
    class Program {
        [DllImport("user32.dll", EntryPoint = "GetDC")]
        static extern IntPtr GetWindowDC(IntPtr hWnd);

        [DllImport("user32.dll", SetLastError = false)]
        static extern IntPtr GetDesktopWindow();

        [DllImport("gdi32.dll", EntryPoint = "CreateCompatibleDC", SetLastError = true)]
        static extern IntPtr CreateCompatibleDC([In] IntPtr hdc);

        private static void assert(bool condition, string error) {
            if (!condition) throw new Exception(error);
        }


        static void Main(string[] args) {
            Rectangle primary = Screen.PrimaryScreen.Bounds;
            int sw = primary.Width;
            int sh = primary.Height;
            IntPtr hwnd = GetDesktopWindow();
            IntPtr wDc = GetWindowDC(hwnd);
            assert(wDc != IntPtr.Zero, "getdc");
            
            Graphics graphic = Graphics.FromHdc(wDc);
            Bitmap bitmap = new Bitmap(1, sh);

            Color CYAN = Color.FromArgb(64, 0, 255, 255);
            Color PINK = Color.FromArgb(64, 255, 0, 255);
            Color WHITE = Color.FromArgb(64, 255, 255, 255);
            
            for (int y = 0; y < sh; y++) {
                int c = y / (sw / 9);
                if (c == 0 || c >= 4) bitmap.SetPixel(0, y, CYAN);
                else if (c == 1 || c == 3) bitmap.SetPixel(0, y, PINK);
                else bitmap.SetPixel(0, y, WHITE);
            }

            TextureBrush brush = new TextureBrush(bitmap);
            while (true) {
                 graphic.FillRectangle(brush, 0, 0, sw, sh);
            }
        }
    }
}