/// <summary>
/// This method retrieves the update region of a control.
/// </summary>
/// <param name="control">The control to retrieve the update region for.</param>
/// <returns>
/// An array of rectangles specifying the area that has been invalidated, or
/// null if this could not be determined.
/// </returns>
/// <remarks>
/// This method is not thread safe.
/// Note to implementors: This method may be implemented as a no-op. In this case, just return null.
/// </remarks>
public static Rectangle[] GetUpdateRegion(Control control)
{
SafeNativeMethods.GetUpdateRgn(control.Handle, hRgn, false);
Rectangle[] scans;
int area;
PdnGraphics.GetRegionScans(hRgn, out scans, out area);
GC.KeepAlive(control);
return(scans);
}
