NAME

       XtAllocateGC - obtain a sharable GC with modifiable fields

SYNTAX

       GC  XtAllocateGC(Widget w, Cardinal depth, XtGCMask value_mask, XGCValues *values, XtGCMask dynamic_mask,
              XtGCMask unused_mask);

ARGUMENTS

       values    Specifies the actual values for this GC.

       value_mask
                 Specifies which fields of the values are specified.

       w         Specifies the widget.

       depth     Specifies the depth for which the returned GC is valid, or 0.

       dynamic_mask
                 Specifies the fields of the GC that will be modified by the caller.

       unused_mask
                 Specifies the fields of the GC that will not be needed by the caller.

DESCRIPTION

       The XtAllocateGC function returns a sharable GC that may be modified by the client.  The screen field  of
       the  specified  widget  or of the nearest widget ancestor of the specified object and the specified depth
       argument supply the root and drawable depths for which the GC is to be valid. If depth is zero the  depth
       is  taken from the depth field of the specified widget or of the nearest widget ancestor of the specified
       object.

       The value_mask argument specifies the fields of the GC that  will  be  initialized  with  the  respective
       members  of  the values structure.  The dynamic_mask argument specifies fields that the caller intends to
       modify during program execution. The caller must ensure that the corresponding GC field is set  prior  to
       each  use  of  the GC. The unused_mask argument specifies fields of the GC that are of no interest to the
       caller. The caller may make no assumptions about the contents of any fields specified in unused_mask. The
       caller may assume that at all times all fields not specified in either dynamic_mask or  unused_mask  have
       their  default  value  if  not  specified  in value_mask or the value specified by values.  If a field is
       specified in both value_mask and dynamic_mask, the effect is as if it were specified only in dynamic_mask
       and then immediately set to the value in values. If a field is set in  unused_mask  and  also  in  either
       value_mask or dynamic_mask, the specification in unused_mask is ignored.

       XtAllocateGC  tries to minimize the number of unique GCs created by comparing the arguments with those of
       previous calls and returning an existing GC when there are no conflicts.   XtAllocateGC  may  modify  and
       return an existing GC if it was allocated with a nonzero unused_mask.

SEE ALSO

       XtGetGC
       X Toolkit Intrinsics - C Language Interface
       Xlib - C Language X Interface

X Version 11                                       libXt 1.1.5                                   XtAllocateGC(3)