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-'\"
-'\" Copyright (c) 1990 The Regents of the University of California.
-'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\" 
-.TH Tk_GetGC 3 "" Tk "Tk Library Procedures"
-.so man.macros
-.BS
-.SH NAME
-Tk_GetGC, Tk_FreeGC \- maintain database of read-only graphics contexts
-.SH SYNOPSIS
-.nf
-\fB#include <tk.h>\fR
-.sp
-GC
-\fBTk_GetGC\fR(\fItkwin, valueMask, valuePtr\fR)
-.sp
-\fBTk_FreeGC(\fIdisplay, gc\fR)
-.SH ARGUMENTS
-.AS "unsigned long" valueMask
-.AP Tk_Window tkwin in
-Token for window in which the graphics context will be used.
-.AP "unsigned long" valueMask in
-Mask of bits (such as \fBGCForeground\fR or \fBGCStipple\fR)
-indicating which fields of \fI*valuePtr\fR are valid.
-.AP XGCValues *valuePtr in
-Pointer to structure describing the desired values for the
-graphics context.
-.AP Display *display in
-Display for which \fIgc\fR was allocated.
-.AP GC gc in
-X identifier for graphics context that is no longer needed.
-Must have been allocated by \fBTk_GetGC\fR.
-.BE
-.SH DESCRIPTION
-.PP
-\fBTk_GetGC\fR and \fBTk_FreeGC\fR manage a collection of graphics contexts
-being used by an application.  The procedures allow graphics contexts to be
-shared, thereby avoiding the server overhead that would be incurred
-if a separate GC were created for each use.  \fBTk_GetGC\fR takes arguments
-describing the desired graphics context and returns an X identifier
-for a GC that fits the description.  The graphics context that is returned
-will have default values in all of the fields not specified explicitly
-by \fIvalueMask\fR and \fIvaluePtr\fR.
-.PP
-\fBTk_GetGC\fR maintains a
-database of all the graphics contexts it has created.  Whenever possible,
-a call to \fBTk_GetGC\fR will
-return an existing graphics context rather than creating a new one.  This
-approach can substantially reduce server overhead, so \fBTk_GetGC\fR
-should generally be used in preference to the Xlib procedure
-\fBXCreateGC\fR, which creates a new graphics context on each call.
-.PP
-Since the return values of \fBTk_GetGC\fR
-are shared, callers should never modify the graphics contexts
-returned by \fBTk_GetGC\fR.
-If a graphics context must be modified dynamically, then it should be
-created by calling \fBXCreateGC\fR instead of \fBTk_GetGC\fR.
-.PP
-When a graphics context
-is no longer needed, \fBTk_FreeGC\fR should be called to release it.
-There should be exactly one call to \fBTk_FreeGC\fR for
-each call to \fBTk_GetGC\fR.
-When a graphics context is no longer in use anywhere (i.e. it has
-been freed as many times as it has been gotten) \fBTk_FreeGC\fR
-will release it to the X server and delete it from the database.
-.SH KEYWORDS
-graphics context