XvQueryBestSize(3X)

Name

       XvQueryBestSize - determine the optimum drawable region size

Syntax

       #include <X11/extensions/Xvlib.h>

       XvQueryBestSize(dpy, port, motion, vw, vh, dw, dh, p_dw, p_dh)

       Display *dpy;
       XvPortID port;
       Bool motion;
       unsigned int vw, vh;
       unsigned int dw, dh;
       unsigned int *p_dw, *p_dh;

Arguments

       dpy            Specifies  the  display screen on which the Xv Server is
                      to accept requests from  Xv  clients.   If  the  display
                      option  is  not  specified,  Xv  uses the display screen
                      specified by your  DISPLAY  environment  variable.   The
                      display  option  has  the format hostname:number.  Using
                      two colons (::) instead of one (:) indicates that DECnet
                      is to be used for transport.

       port           Defines the port associated with the display and adaptor
                      for which the optimum size is to be calculated.

       motion         Specifies True if the destination size needs to  support
                      full motion, and False if the destination size need only
                      support still images.

       vw,vh          Specifies the size of the source video region desired.

       dw,dh          Specifies the size of the  destination  drawable  region
                      desired.

       p_dw,p_dh      Pointers  to  where  the  closest destination sizes sup-
                      ported by the server are returned.

Description

       Some  ports  may  be  able  to  scale  incoming  or   outgoing   video.
       XvQueryBestSize(3X)  returns the size of the closest destination region
       that is supported by the adaptor.  The returned size is  guaranteed  to
       be smaller than the requested size if a smaller size is supported.

Returned Values

       [Success]
               Returned if XvQueryBestSize(3X) completed successfully.

       [XvBadExtension]
               Returned if the Xv extension is unavailable.

       [XvBadAlloc]
               Returned  if  XvQueryBestSize(3X)  failed to allocate memory to
               process the request.

Diagnostics

       [XvBadPort]
               Generated if the requested port does not exist.

X.Org                            Version 6.8.2             XvQueryBestSize(3X)