public unsafe override void CopyPixels(Int32Rect?sourceRect, int stride, IntPtr buffer, int bufferLength)
{
Int32Rect rect;
IntPtr rectPtr;
if (sourceRect.HasValue)
{
rect = sourceRect.Value;
rectPtr = new IntPtr(&rect);
}
else
{
rectPtr = IntPtr.Zero;
}
_frame.CopyPixels(rectPtr, (uint)stride, buffer, (uint)bufferLength);
}
