System.Windows.Interop.D3DImage.UpdateResource C# (CSharp) Method

        internal override void UpdateResource(DUCE.Channel channel, bool skipOnChannelCheck)
        {
            // If we're told we can skip the channel check, then we must be on channel
            Debug.Assert(!skipOnChannelCheck || _duceResource.IsOnChannel(channel));

            if (skipOnChannelCheck || _duceResource.IsOnChannel(channel))
            {
                base.UpdateResource(channel, skipOnChannelCheck);

                bool isSynchronous = channel.IsSynchronous;

                DUCE.MILCMD_D3DIMAGE data;
                unsafe
                {
                    data.Type = MILCMD.MilCmdD3DImage;
                    data.Handle = _duceResource.GetHandle(channel);
                    if (_pInteropDeviceBitmap != null)
                    {
                        UnsafeNativeMethods.MILUnknown.AddRef(_pInteropDeviceBitmap);
                        
                        data.pInteropDeviceBitmap = (ulong)_pInteropDeviceBitmap.DangerousGetHandle().ToPointer();
                    }
                    else
                    {
                        data.pInteropDeviceBitmap = 0;
                    }
                    
                    data.pSoftwareBitmap = 0;

                    if (isSynchronous)
                    {
                        _softwareCopy = CopyBackBuffer();
                        
                        if (_softwareCopy != null)
                        {
                            UnsafeNativeMethods.MILUnknown.AddRef(_softwareCopy.WicSourceHandle);
                            
                            data.pSoftwareBitmap = (ulong)_softwareCopy.WicSourceHandle.DangerousGetHandle().ToPointer();
                        }
                    }

                    // Send packed command structure
                    channel.SendCommand(
                        (byte*)&data,
                        sizeof(DUCE.MILCMD_D3DIMAGE),
                        false /* sendInSeparateBatch */
                        );
                }

                // Presents only happen on the async channel so don't let RTB flip this bit
                if (!isSynchronous)
                {
                    _waitingForUpdateResourceBecauseBitmapChanged = false;
                }
            }
        }