private void ScanQRCodeItem_Click(object sender, EventArgs e)
        {
            foreach (Screen screen in Screen.AllScreens)
            {
                using (Bitmap fullImage = new Bitmap(screen.Bounds.Width,
                                                     screen.Bounds.Height))
                {
                    using (Graphics g = Graphics.FromImage(fullImage))
                    {
                        g.CopyFromScreen(screen.Bounds.X,
                                         screen.Bounds.Y,
                                         0, 0,
                                         fullImage.Size,
                                         CopyPixelOperation.SourceCopy);
                    }
                    int maxTry = 10;
                    for (int i = 0; i < maxTry; i++)
                    {
                        int       marginLeft = (int)((double)fullImage.Width * i / 2.5 / maxTry);
                        int       marginTop  = (int)((double)fullImage.Height * i / 2.5 / maxTry);
                        Rectangle cropRect   = new Rectangle(marginLeft, marginTop, fullImage.Width - marginLeft * 2, fullImage.Height - marginTop * 2);
                        Bitmap    target     = new Bitmap(screen.Bounds.Width, screen.Bounds.Height);

                        double imageScale = (double)screen.Bounds.Width / (double)cropRect.Width;
                        using (Graphics g = Graphics.FromImage(target))
                        {
                            g.DrawImage(fullImage, new Rectangle(0, 0, target.Width, target.Height),
                                        cropRect,
                                        GraphicsUnit.Pixel);
                        }
                        var          source = new BitmapLuminanceSource(target);
                        var          bitmap = new BinaryBitmap(new HybridBinarizer(source));
                        QRCodeReader reader = new QRCodeReader();
                        var          result = reader.decode(bitmap);
                        if (result != null)
                        {
                            var success             = controller.AddServerByURL(result.Text);
                            QRCodeSplashForm splash = new QRCodeSplashForm();
                            if (success)
                            {
                                splash.FormClosed += splash_FormClosed;
                            }
                            else if (result.Text.ToLower().StartsWith("http://") || result.Text.ToLower().StartsWith("https://"))
                            {
                                _urlToOpen         = result.Text;
                                splash.FormClosed += openURLFromQRCode;
                            }
                            else
                            {
                                MessageBox.Show(I18N.GetString("Failed to decode QRCode"));
                                return;
                            }
                            double minX = Int32.MaxValue, minY = Int32.MaxValue, maxX = 0, maxY = 0;
                            foreach (ResultPoint point in result.ResultPoints)
                            {
                                minX = Math.Min(minX, point.X);
                                minY = Math.Min(minY, point.Y);
                                maxX = Math.Max(maxX, point.X);
                                maxY = Math.Max(maxY, point.Y);
                            }
                            minX /= imageScale;
                            minY /= imageScale;
                            maxX /= imageScale;
                            maxY /= imageScale;
                            // make it 20% larger
                            double margin = (maxX - minX) * 0.20f;
                            minX           += -margin + marginLeft;
                            maxX           += margin + marginLeft;
                            minY           += -margin + marginTop;
                            maxY           += margin + marginTop;
                            splash.Location = new Point(screen.Bounds.X, screen.Bounds.Y);
                            // we need a panel because a window has a minimal size
                            // TODO: test on high DPI
                            splash.TargetRect = new Rectangle((int)minX, (int)minY, (int)maxX - (int)minX, (int)maxY - (int)minY);
                            splash.Size       = new Size(fullImage.Width, fullImage.Height);
                            splash.Show();
                            return;
                        }
                    }
                }
            }
            MessageBox.Show(I18N.GetString("No QRCode found. Try to zoom in or move it to the center of the screen."));
        }