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.AddServerBySSURL(result.Text); QRCodeSplashForm splash = new QRCodeSplashForm(); if (success) { splash.FormClosed += splash_FormClosed; } else if (result.Text.StartsWith("http://") || result.Text.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 + screen.Bounds.X, (int)minY + screen.Bounds.Y, (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.")); }