Name
XvQueryBestSize - determine the optimum drawable region size
Syntax
#include
XXvvQQuueerryyBBeessttSSiizzee(_d_p_y_, _p_o_r_t_, _m_o_t_i_o_n_, _v_w_, _v_h_, _d_w_, _d_h_, _p___d_w_, _p___d_h)
Display _*_d_p_y;
XvPortID _p_o_r_t;
Bool _m_o_t_i_o_n;
unsigned
int _v_w_, _v_h;
uunnssiiggnneedd iinntt _d_w_, _d_h_;
uunnssiiggnneedd iinntt _*_p___d_w_, _*_p___d_h_;
Arguments
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_d_p_y
Specifies the display screen on which the
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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.
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_p_o_r_t
Defines the port associated with the display and adaptor for which
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the optimum size is to be calculated.
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_m_o_t_i_o_n
Specifies _T_r_u_e if the destination size needs to support
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full motion, and _F_a_l_s_e if the destination size need only
support still images.
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_v_w_,_v_h
Specifies the size of the source video region desired.
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_d_w_,_d_h
Specifies the size of the destination drawable region desired.
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_p___d_w_,_p___d_h
Pointers to where the closest destination sizes supported by the server are
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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
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[Success]
Returned if XvQueryBestSize(3X) completed successfully.
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[XvBadExtension]
Returned if the Xv extension is unavailable.
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[XvBadAlloc]
Returned if XvQueryBestSize(3X) failed to allocate memory to process
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the request.
Diagnostics
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[XvBadPort]
Generated if the requested port does not exist.
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