for (int y = 0; y < height; y++)
                for (int x = 0; x < width; x++)
                {
                    alpha = pixels[y * stride + x * 4 + 3];
                    red = pixels[y * stride + x * 4 + 2];
                    green = pixels[y * stride + x * 4 + 1];
                    blue = pixels[y * stride + x * 4 + 0];
                    bitmap.SetPixel(x, y, System.Drawing.Color.FromArgb(alpha, red, green, blue));
                }

            using (MemoryStream memory = new MemoryStream())
            {
                bitmap.Save(memory, ImageFormat.Png);
                memory.Position = 0;
                BitmapImage bitmapImage = new BitmapImage();
                bitmapImage.BeginInit();
                bitmapImage.StreamSource = memory;
                bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
                bitmapImage.EndInit();
                ObrazGlowny = bitmapImage;
                obrazek.Source = bitmapImage;
            }