74 lines
2.7 KiB
Groff
74 lines
2.7 KiB
Groff
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'\"
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'\" Copyright (c) 1994 The Regents of the University of California.
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'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
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'\"
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'\" See the file "license.terms" for information on usage and redistribution
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'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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'\"
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'\" SCCS: @(#) GetClrmap.3 1.5 96/03/26 18:09:27
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'\"
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.so man.macros
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.TH Tk_GetColormap 3 4.0 Tk "Tk Library Procedures"
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.BS
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.SH NAME
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Tk_GetColormap, Tk_FreeColormap \- allocate and free colormaps
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.SH SYNOPSIS
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.nf
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\fB#include <tk.h>\fR
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.sp
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Colormap
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\fBTk_GetColormap(\fIinterp, tkwin, string\fB)\fR
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.sp
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\fBTk_FreeColormap(\fIdisplay, colormap\fB)\fR
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.SH ARGUMENTS
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.AS "Colormap" colormap
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.AP Tcl_Interp *interp in
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Interpreter to use for error reporting.
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.AP Tk_Window tkwin in
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Token for window in which colormap will be used.
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.AP char *string in
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Selects a colormap: either \fBnew\fR or the name of a window
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with the same screen and visual as \fItkwin\fR.
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.AP Display *display in
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Display for which \fIcolormap\fR was allocated.
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.AP Colormap colormap in
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Colormap to free; must have been returned by a previous
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call to \fBTk_GetColormap\fR or \fBTk_GetVisual\fR.
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.BE
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.SH DESCRIPTION
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.PP
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These procedures are used to manage colormaps.
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\fBTk_GetColormap\fR returns a colormap suitable for use in \fItkwin\fR.
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If its \fIstring\fR argument is \fBnew\fR then a new colormap is
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created; otherwise \fIstring\fR must be the name of another window
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with the same screen and visual as \fItkwin\fR, and the colormap from that
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window is returned.
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If \fIstring\fR doesn't make sense, or if it refers to a window on
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a different screen from \fItkwin\fR or with
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a different visual than \fItkwin\fR, then \fBTk_GetColormap\fR returns
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\fBNone\fR and leaves an error message in \fIinterp->result\fR.
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.PP
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\fBTk_FreeColormap\fR should be called when a colormap returned by
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\fBTk_GetColormap\fR is no longer needed.
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Tk maintains a reference count for each colormap returned by
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\fBTk_GetColormap\fR, so there should eventually be one call to
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\fBTk_FreeColormap\fR for each call to \fBTk_GetColormap\fR.
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When a colormap's reference count becomes zero, Tk releases the
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X colormap.
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.PP
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\fBTk_GetVisual\fR and \fBTk_GetColormap\fR work together, in that
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a new colormap created by \fBTk_GetVisual\fR may later be returned
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by \fBTk_GetColormap\fR.
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The reference counting mechanism for colormaps includes both procedures,
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so callers of \fBTk_GetVisual\fR must also call \fBTk_FreeColormap\fR
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to release the colormap.
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If \fBTk_GetColormap\fR is called with a \fIstring\fR value of
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\fBnew\fR then the resulting colormap will never
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be returned by \fBTk_GetVisual\fR; however, it can be used in other
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windows by calling \fBTk_GetColormap\fR with the original window's
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name as \fIstring\fR.
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.SH KEYWORDS
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colormap
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