'\"
'\" Copyright (c) 1994 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.
'\" 
'\" RCS: @(#) $Id: GetClrmap.3,v 1.3 2002/08/05 04:30:38 dgp Exp $
'\" 
'\" The definitions below are for supplemental macros used in Tcl/Tk
'\" manual entries.
'\"
'\" .AP type name in/out ?indent?
'\"	Start paragraph describing an argument to a library procedure.
'\"	type is type of argument (int, etc.), in/out is either "in", "out",
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'\"	needed;  use .AS below instead)
'\"
'\" .AS ?type? ?name?
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'\" .BS
'\"	Start box enclosure.  From here until next .BE, everything will be
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'\" .VS ?version? ?br?
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'\"	found and removed when they reach a certain age.  If another argument
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'\"	End of vertical sidebar.
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'\" .DS
'\"	Begin an indented unfilled display.
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'\"	End of indented unfilled display.
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'\"	Start of list of standard options for a Tk widget.  The
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'\"
'\" .SE
'\"	End of list of standard options for a Tk widget.
'\"
'\" .OP cmdName dbName dbClass
'\"	Start of description of a specific option.  cmdName gives the
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'\" .UL arg1 arg2
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'\"
'\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $
'\"
'\"	# Set up traps and other miscellaneous stuff for Tcl/Tk man pages.
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.nr ^l \n(.l
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.AS Tcl_Interp Tcl_CreateInterp in/out
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\h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul'
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See the \\fBoptions\\fR manual entry for details on the standard options.
..
'\"	# OP - start of full description for a single option
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Command-Line Name:	\\fB\\$1\\fR
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..
.TH Tk_GetColormap 3 4.0 Tk "Tk Library Procedures"
.BS
.SH NAME
Tk_GetColormap, Tk_FreeColormap \- allocate and free colormaps
.SH SYNOPSIS
.nf
\fB#include <tk.h>\fR
.sp
Colormap
\fBTk_GetColormap(\fIinterp, tkwin, string\fB)\fR
.sp
\fBTk_FreeColormap(\fIdisplay, colormap\fB)\fR
.SH ARGUMENTS
.AS "Colormap" colormap
.AP Tcl_Interp *interp in
Interpreter to use for error reporting.
.AP Tk_Window tkwin in
Token for window in which colormap will be used.
.AP "CONST char" *string in
Selects a colormap:  either \fBnew\fR or the name of a window
with the same screen and visual as \fItkwin\fR.
.AP Display *display in
Display for which \fIcolormap\fR was allocated.
.AP Colormap colormap in
Colormap to free;  must have been returned by a previous
call to \fBTk_GetColormap\fR or \fBTk_GetVisual\fR.
.BE

.SH DESCRIPTION
.PP
These procedures are used to manage colormaps.
\fBTk_GetColormap\fR returns a colormap suitable for use in \fItkwin\fR.
If its \fIstring\fR argument is \fBnew\fR then a new colormap is
created;  otherwise \fIstring\fR must be the name of another window
with the same screen and visual as \fItkwin\fR, and the colormap from that
window is returned.
If \fIstring\fR doesn't make sense, or if it refers to a window on
a different screen from \fItkwin\fR or with
a different visual than \fItkwin\fR, then \fBTk_GetColormap\fR returns
\fBNone\fR and leaves an error message in \fIinterp->result\fR.
.PP
\fBTk_FreeColormap\fR should be called when a colormap returned by
\fBTk_GetColormap\fR is no longer needed.
Tk maintains a reference count for each colormap returned by
\fBTk_GetColormap\fR, so there should eventually be one call to
\fBTk_FreeColormap\fR for each call to \fBTk_GetColormap\fR.
When a colormap's reference count becomes zero, Tk releases the
X colormap.
.PP
\fBTk_GetVisual\fR and \fBTk_GetColormap\fR work together, in that
a new colormap created by \fBTk_GetVisual\fR may later be returned
by \fBTk_GetColormap\fR.
The reference counting mechanism for colormaps includes both procedures,
so callers of \fBTk_GetVisual\fR must also call \fBTk_FreeColormap\fR
to release the colormap.
If \fBTk_GetColormap\fR is called with a \fIstring\fR value of
\fBnew\fR then the resulting colormap will never
be returned by \fBTk_GetVisual\fR;  however, it can be used in other
windows by calling \fBTk_GetColormap\fR with the original window's
name as \fIstring\fR.

.SH KEYWORDS
colormap