[Spice-devel] [PATCH qxl-wddm-dod] Implements screen to screen move correctly

[Frediano Ziglio]

ping

Maybe this requires some follow ups for VgaDevice and
possibly avoinind taking into account moves during mapping
computation.

Frediano

> 
> Doing some fast check on Windows 8.1 you could note that
> moving windows you got a weird effect were windows were a
> bit misaligned.
> As documented in DXGKARG_PRESENT_DISPLAYONLY page
> NumMoves/pMoves fields point to an array of screen-to-screen
> moves while our code implemented them as an image drawing
> (the same implementation of dirty rects) causing the weird
> effect mentioned.
> This patch implement the moves using QXL_COPY_BITS operation
> instead of a QXL_DRAW_COPY fixing the issue and avoiding sending
> image to the server making the move/scroll operations on the
> guest faster (and taking less bandwidth).
> It seems that Windows 10 doesn't send the move commands but
> instead send only dirty rects so you can't note this problem
> using Windows 10.
> 
> Signed-off-by: Frediano Ziglio <fziglio at redhat.com>
> ---
>  qxldod/QxlDod.cpp | 26 +++++++++++++++++++++-----
>  qxldod/QxlDod.h   |  1 +
>  2 files changed, 22 insertions(+), 5 deletions(-)
> 
> diff --git a/qxldod/QxlDod.cpp b/qxldod/QxlDod.cpp
> index 68e3383..7adbec4 100755
> --- a/qxldod/QxlDod.cpp
> +++ b/qxldod/QxlDod.cpp
> @@ -3738,11 +3738,7 @@ QxlDevice::ExecutePresentDisplayOnly(
>          DbgPrint(TRACE_LEVEL_INFORMATION, ("--- %d SourcePoint.x = %ld,
>          SourcePoint.y = %ld, DestRect.bottom = %ld, DestRect.left = %ld,
>          DestRect.right = %ld, DestRect.top = %ld\n",
>              i , pSourcePoint->x, pSourcePoint->y, pDestRect->bottom,
>              pDestRect->left, pDestRect->right, pDestRect->top));
>  
> -        BltBits(&DstBltInfo,
> -        &SrcBltInfo,
> -        1,
> -        pDestRect,
> -        pSourcePoint);
> +        CopyBits(*pDestRect, *pSourcePoint);
>      }
>  
>      // Copy all the dirty rects from source image to video frame buffer.
> @@ -4184,6 +4180,26 @@ VOID QxlDevice::SetImageId(InternalImage *internal,
>      }
>  }
>  
> +void QxlDevice::CopyBits(const RECT& rect, const POINT& sourcePoint)
> +{
> +    PAGED_CODE();
> +    QXLDrawable *drawable;
> +
> +    DbgPrint(TRACE_LEVEL_VERBOSE, ("---> %s device %d\n",
> __FUNCTION__,m_Id));
> +
> +    if (!(drawable = Drawable(QXL_COPY_BITS, &rect, NULL, 0))) {
> +        DbgPrint(TRACE_LEVEL_ERROR, ("Cannot get Drawable.\n"));
> +        return;
> +    }
> +
> +    drawable->u.copy_bits.src_pos.x = sourcePoint.x;
> +    drawable->u.copy_bits.src_pos.y = sourcePoint.y;
> +
> +    PushDrawable(drawable);
> +
> +    DbgPrint(TRACE_LEVEL_VERBOSE, ("<--- %s\n", __FUNCTION__));
> +}
> +
>  VOID QxlDevice::BltBits (
>      BLT_INFO* pDst,
>      CONST BLT_INFO* pSrc,
> diff --git a/qxldod/QxlDod.h b/qxldod/QxlDod.h
> index b151484..324c3d6 100755
> --- a/qxldod/QxlDod.h
> +++ b/qxldod/QxlDod.h
> @@ -487,6 +487,7 @@ protected:
>                      UINT  NumRects,
>                      _In_reads_(NumRects) CONST RECT *pRects,
>                      POINT*   pSourcePoint);
> +    void QxlDevice::CopyBits(const RECT& rect, const POINT& sourcePoint);
>      QXLDrawable *Drawable(UINT8 type,
>                      CONST RECT *area,
>                      CONST RECT *clip,