Xserver doesn't support XvPutImage to Pixmap?

[Shengquan Yuan]

Hi,

I tried to use XvPutImage to draw into a pixmap, but it always returns
error. After tracing into Xserver, I found function
hw/xfree86/common/xf86xv.c:xf86XVPutImage checks whether the drawable
is WINDOW, if not, it returns BadAlloc directly, see bellow code:

> static int
> xf86XVPutImage(
>   ClientPtr client,
>   DrawablePtr pDraw,
>   XvPortPtr pPort,
>   GCPtr pGC,
>   INT16 src_x, INT16 src_y,
>   CARD16 src_w, CARD16 src_h,
>   INT16 drw_x, INT16 drw_y,
>   CARD16 drw_w, CARD16 drw_h,
>   XvImagePtr format,
>   unsigned char* data,
>   Bool sync,
>   CARD16 width, CARD16 height
> ){
>  XvPortRecPrivatePtr portPriv = (XvPortRecPrivatePtr)(pPort->devPriv.ptr);
>  ScreenPtr pScreen;
>  RegionRec WinRegion;
>  RegionRec ClipRegion;
>  BoxRec WinBox;
>  int ret = Success;
>  Bool clippedAway = FALSE;
>
>  if (pDraw->type != DRAWABLE_WINDOW)
> =>    return BadAlloc;

I also looked at Xvideo implementation in Xserver video driver, and it
looks like texture video supports rendering into a pixmap:

>    if (pDraw->type == DRAWABLE_WINDOW)
>        pPriv->pPixmap = (*pScreen->GetWindowPixmap)((WindowPtr)pDraw);
>    else
>        pPriv->pPixmap = (PixmapPtr)pDraw;
>
> #ifdef USE_EXA
>    if (info->useEXA) {
>        /* Force the pixmap into framebuffer so we can draw to it. */
>        exaMoveInPixmap(pPriv->pPixmap);
>    }
> #endif
>

I am wondering what's the reason that Xserver returns failure directly
when XvPutImage drawing into a pixmap?

Thanks
Austin