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-'\"
-'\" 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.
-'\" 
-.TH Tk_GetVisual 3 4.0 Tk "Tk Library Procedures"
-.so man.macros
-.BS
-.SH NAME
-Tk_GetVisual \- translate from string to visual
-.SH SYNOPSIS
-.nf
-\fB#include <tk.h>\fR
-.sp
-Visual *
-\fBTk_GetVisual(\fIinterp, tkwin, string, depthPtr, colormapPtr\fB)\fR
-.SH ARGUMENTS
-.AS "Tcl_Interp" *colormapPtr
-.AP Tcl_Interp *interp in
-Interpreter to use for error reporting.
-.AP Tk_Window tkwin in
-Token for window in which the visual will be used.
-.AP "const char" *string in
-String that identifies the desired visual.  See below for
-valid formats.
-.AP int *depthPtr out
-Depth of returned visual gets stored here.
-.AP Colormap *colormapPtr out
-If non-NULL then a suitable colormap for visual is found and its
-identifier is stored here.
-.BE
-.SH DESCRIPTION
-.PP
-\fBTk_GetVisual\fR takes a string description of a visual and
-finds a suitable X Visual for use in \fItkwin\fR, if there is one.
-It returns a pointer to the X Visual structure for the visual
-and stores the number of bits per pixel for it at \fI*depthPtr\fR.
-If \fIstring\fR is unrecognizable or if no suitable visual could
-be found, then NULL is returned and \fBTk_GetVisual\fR leaves
-an error message in interpreter \fIinterp\fR's result.
-If \fIcolormap\fR is non-NULL then \fBTk_GetVisual\fR
-also locates an appropriate colormap for use with the result visual
-and stores its X identifier at \fI*colormapPtr\fR.
-.PP
-The \fIstring\fR argument specifies the desired visual in one
-of the following ways:
-.TP 15
-\fIclass depth\fR
-The string consists of a class name followed by an integer depth,
-with any amount of white space (including none) in between.
-\fIclass\fR selects what sort of visual is desired and must be one of
-\fBdirectcolor\fR, \fBgrayscale\fR, \fBgreyscale\fR, \fBpseudocolor\fR,
-\fBstaticcolor\fR, \fBstaticgray\fR, \fBstaticgrey\fR, or
-\fBtruecolor\fR, or a unique abbreviation.
-\fIdepth\fR specifies how many bits per pixel are needed for the
-visual.
-If possible, \fBTk_GetVisual\fR will return a visual with this depth;
-if there is no visual of the desired depth then \fBTk_GetVisual\fR
-looks first for a visual with greater depth, then one with less
-depth.
-.TP 15
-\fBdefault\fR
-Use the default visual for \fItkwin\fR's screen.
-.TP 15
-\fIpathName\fR
-Use the visual for the window given by \fIpathName\fR.
-\fIpathName\fR must be the name of a window on the same screen
-as \fItkwin\fR.
-.TP 15
-\fInumber\fR
-Use the visual whose X identifier is \fInumber\fR.
-.TP 15
-\fBbest\fR ?\fIdepth\fR?
-Choose the
-.QW "best possible"
-visual, using the following rules, in decreasing order of priority:
-.RS
-.IP (a)
-a visual that has exactly the desired depth is best, followed
-by a visual with greater depth than requested (but as little extra
-as possible), followed by a visual with less depth than requested
-(but as great a depth as possible);
-.IP (b)
-if no \fIdepth\fR is specified, then the deepest available visual
-is chosen;
-.IP (c)
-\fBpseudocolor\fR is better than \fBtruecolor\fR or \fBdirectcolor\fR,
-which are better than \fBstaticcolor\fR, which is better than
-\fBstaticgray\fR or \fBgrayscale\fR;
-.IP (d)
-the default visual for the screen is better than any other visual.
-.RE
-.SH CREDITS
-.PP
-The idea for \fBTk_GetVisual\fR, and the first implementation, came
-from Paul Mackerras.
-.SH KEYWORDS
-colormap, screen, visual