public void LockBits()
{
if( Bitmap == null ) throw new InvalidOperationException( "Underlying bitmap is null." );
if( data != null ) return;
data = ByteBuffer.AllocateDirect( Bitmap.Width * Bitmap.Height * 4 );
Bitmap.CopyPixelsToBuffer( data );
Scan0 = data.GetDirectBufferAddress();
scan0Byte = (byte*)Scan0;
Stride = Bitmap.Width * 4;
Width = Bitmap.Width;
Height = Bitmap.Height;
}