title: Copy Bitmap into other Bitmap with WPF
body: <p>I need to put a bitmap into the center of another bitmap with WPF.</p>
  
  <p>I managed to create a empty picture with the dimensions I want but I don't understand how to copy another <code>BitmapFrame</code> into it.</p>
  
  <pre><code>BitmapSource bs = BitmapSource.Create(
      width, height,
      dpi, dpi,
      PixelFormats.Rgb24,
      null,
      bits,
      stride);
  </code></pre>