XSGIvcQueryVideoScreenInfo(3)

     NAME
          XSGIvcQueryVideoScreenInfo - Query video screen, graphics
          type

     SYNOPSIS
          #include <X11/extensions/XSGIvc.h>

          Status XSGIvcQueryVideoScreenInfo(Display *display,
              int screen,
              XSGIvcScreenInfo *sinfo_return)

     PARAMETER
          display        Specifies the connection to the X server.

          screen         Specifies the screen of the X server.

          sinfo_return   A pointer to the XSGIvcScreenInfo variable
                         which is to receive the corresponding
                         information.


     DESCRIPTION
          XSGIvcQueryVideoScreenInfo returns a XSGIvcServerInfo
          structure containing video server information for a
          specified screen.


     RETURN VALUE
          This function returns TRUE if successful, FALSE upon
          failure.

          Parameter errors are reported via BadValue or BadMatch.


     STRUCTURES
          The structure returned is shown below.

          /* See flags in XSGIvcScreenInfo */
          #define XSGIVC_SIFFormatPerChannel (1L << 0)   /* Formats change per channel */
          #define XSGIVC_SIFFormatCombination     (1L << 1)   /* Formats change via combination */

          typedef struct {
              int             numChannels;   /* Number of output channels */
              long            flags;         /* See XSGIVC_SIF... masks */
              Bool            lockOp;        /* XSGIvcSetScreenInputSyncSource usable */
              char      graphicsType[XSGIVC_NAME_MAX]; /* Names of gfx hw */
              int            numExternalSync;     /* Number of external sync ports */
          }               XSGIvcScreenInfo;

          numChannels specifies the number of output channels on this
          server.  You may use set or query operations on channels
          numbering 0 to numChannels - 1.
          The flags field may contain the following mask bits:

          XSGIVC_SIFFormatPerChannel
                        Video formats may be changed for each channel.
                        Servers with multiple channels need not use
                        format combinations.

          XSGIVC_SIFFormatCombination
                        Video formats may be changed en masse with a
                        format combination.

          lockOp describes whether the server has the capability to
          lock to external sync sources via the
          XSGIvcSetScreenInputSyncSource function.

          graphicsType contains a null-terminated ASCII string
          containing the name of the graphics hardware type.  The name
          is unique for each type of graphics hardware.

          numExternalSync contains the number of external sync
          sources.


     SEE ALSO
          XSGIvc, XSGIvcListVideoFormats,
          XSGIvcSetScreenInputSyncSource