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authordkf <donal.k.fellows@manchester.ac.uk>2008-03-19 15:34:40 (GMT)
committerdkf <donal.k.fellows@manchester.ac.uk>2008-03-19 15:34:40 (GMT)
commit9b42a60edca63854c20fc62ffa51bb8dc2467293 (patch)
treed527c46cbfb60d2d280c193ec256f6aac155fd59 /doc/GetClrmap.3
parent90ce810746fbaa08d5fa7099a347066d737c9275 (diff)
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Documented Tk_PreserveColormap. [Bug 220809]
Diffstat (limited to 'doc/GetClrmap.3')
-rw-r--r--doc/GetClrmap.322
1 files changed, 14 insertions, 8 deletions
diff --git a/doc/GetClrmap.3 b/doc/GetClrmap.3
index 88f562c..cfb84d9 100644
--- a/doc/GetClrmap.3
+++ b/doc/GetClrmap.3
@@ -5,13 +5,13 @@
'\" 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 1.6 2007/12/13 15:23:43 dgp Exp $
+'\" RCS: @(#) $Id: GetClrmap.3,v 1.7 2008/03/19 15:34:41 dkf Exp $
'\"
.so man.macros
.TH Tk_GetColormap 3 4.0 Tk "Tk Library Procedures"
.BS
.SH NAME
-Tk_GetColormap, Tk_FreeColormap \- allocate and free colormaps
+Tk_GetColormap, Tk_PreserveColormap, Tk_FreeColormap \- allocate and free colormaps
.SH SYNOPSIS
.nf
\fB#include <tk.h>\fR
@@ -19,6 +19,8 @@ Tk_GetColormap, Tk_FreeColormap \- allocate and free colormaps
Colormap
\fBTk_GetColormap(\fIinterp, tkwin, string\fB)\fR
.sp
+\fBTk_PreserveColormap(\fIdisplay, colormap\fB)\fR
+.sp
\fBTk_FreeColormap(\fIdisplay, colormap\fB)\fR
.SH ARGUMENTS
.AS "Colormap" colormap
@@ -32,10 +34,9 @@ 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
+Colormap to free or preserve; 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.
@@ -47,13 +48,19 @@ window is returned.
If \fIstring\fR does not 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.
+\fBNone\fR and leaves an error message in \fIinterp\fR's result.
+.PP
+\fBTk_PreserveColormap\fR increases the internal reference count for a
+colormap previously returned by \fBTk_GetColormap\fR, which allows the
+colormap to be stored in several locations without knowing which order
+they will be released.
.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.
+\fBTk_FreeColormap\fR for each call to \fBTk_GetColormap\fR and each
+call to \fBTk_PreserveColormap\fR.
When a colormap's reference count becomes zero, Tk releases the
X colormap.
.PP
@@ -68,6 +75,5 @@ If \fBTk_GetColormap\fR is called with a \fIstring\fR value of
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
+colormap, visual