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#define INCL_GPISEGMENTS
 
BOOL GpiSetSegmentPriority(hps, idSegment, idRefSegment, cmdOrder)
HPS hps;              /* presentation-space handle    */
LONG idSegment;       /* segment identifier           */
LONG idRefSegment;    /* reference-segment identifier */
LONG cmdOrder;        /* command options              */
 
The GpiSetSegmentPriority function sets the priority for the segment
specified by idSegment. Segment priority applies only to chained segments.
The segment priority of a segment specifies the position of that segment in
the picture chain. The priority affects how the segment appears when drawn,
since segments with higher priorities (later positions in the chain) may
draw over the segment.
 
The function changes a segment's priority by moving its position in the
picture chain relative to a given segment. The function places the segment
either before or after the segment specified by the idRefSegment parameter.
The cmdOrder parameter specifies the priority that the segment should have
relative to the idRefSegment segment, and therefore determines whether it
goes before or after. The function places the segment at either the
beginning or end of the picture chain if the idRefSegment parameter is
zero.
 
Parameter     Description
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hps           Identifies the presentation space.
 
idSegment     Specifies the identifier of the segment whose priority is to
              change; it must be greater than zero.
 
idRefSegment  Specifies the reference-segment identifier. It must be the
              identifier of a segment in the picture chain, or it must be
              zero. If it is zero, the function uses the beginning or end of
              the picture chain.
 
cmdOrder      Specifies whether to give the segment higher or lower priority
              than the segment specified by idRefSegment. It can be one of
              the following values:
 
              Value       Meaning
              ──────────────────────────────────────────────────────────────
              LOWER_PRI   Gives the segment lower priority. The function
                          places the segment before the reference segment in
                          the chain. If the idRefSegment is zero, the
                          function makes the segment the highest-priority
                          segment.
 
              HIGHER_PRI  Gives the segment higher priority. The function
                          places the segment after the reference segment in
                          the chain. If the idRefSegment is zero, the
                          function makes the segment the lowest-priority
                          segment.
 
Return Value
 
The return value is GPI_OK if the function is successful or GPI_ERROR if an
error occurred.
 
Errors
 
Use the WinGetLastError function to retrieve the error value, which may be
one of the following:
 
     PMERR_INV_HPS
     PMERR_INV_MICROPS_FUNCTION
     PMERR_INV_ORDERING_PARM
     PMERR_INV_SEG_NAME
     PMERR_PS_BUSY
     PMERR_SEG_AND_REFSEG_ARE_SAME
     PMERR_SEG_IS_CURRENT
     PMERR_SEG_NOT_CHAINED
     PMERR_SEG_NOT_FOUND
 
See Also
 
GpiDrawChain, GpiDrawFrom, GpiQuerySegmentPriority, WinGetLastError
 
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