.TH XvQueryBestSize 3 "libXv 1.0.12" "X Version 11" "libXv Functions"
.SH NAME
XvQueryBestSize \- determine the optimum drawable region size
.\"
.SH SYNOPSIS
.B #include <X11/extensions/Xvlib.h>
.sp
.nf
.BI "int XvQueryBestSize(Display *" dpy ", XvPort " port ", Bool " motion ","
.BI "                    unsigned int " vw ", unsigned int " vh ","
.BI "                    unsigned int " dw ", unsigned int " dh ","
.BI "                    unsigned int *" p_dw ", unsigned int *" p_dh ");"
.fi
.SH ARGUMENTS
.\"
.IP \fIdpy\fR 15
Specifies the connection to the X server.
.IP \fIport\fR 15
Defines the port associated with the display and adaptor for which
the optimum size is to be calculated.
.IP \fImotion\fR 15
Specifies \fITrue\fP if the destination size needs to support
full motion, and \fIFalse\fP if the destination size need only
support still images.
.IP \fIvw,vh\fR 15
Specifies the size of the source video region desired.
.IP \fIdw,dh\fR 15
Specifies the size of the destination drawable region desired.
.IP \fIp_dw,p_dh\fR 15
Pointers to where the closest destination sizes supported by the server are
returned.
.\"
.SH DESCRIPTION
.\"
Some ports may be able to scale incoming or outgoing video.
.BR XvQueryBestSize (3)
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.
.\"
.SH RETURN VALUES
.IP [Success] 8
Returned if
.BR XvQueryBestSize (3)
completed successfully.
.IP [XvBadExtension] 8
Returned if the Xv extension is unavailable.
.IP [XvBadAlloc] 8
Returned if
.BR XvQueryBestSize (3)
failed to allocate memory to process the request.
.SH DIAGNOSTICS
.IP [XvBadPort] 8
Generated if the requested port does not exist.
.br