93 lines
3.7 KiB
Groff
93 lines
3.7 KiB
Groff
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'\"
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'\" Copyright (c) 1990-1992 The Regents of the University of California.
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'\" All rights reserved.
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'\"
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'\" Permission is hereby granted, without written agreement and without
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'\" license or royalty fees, to use, copy, modify, and distribute this
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'\" documentation for any purpose, provided that the above copyright
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'\" notice and the following two paragraphs appear in all copies.
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'\"
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'\" IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
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'\" FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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'\" ARISING OUT OF THE USE OF THIS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
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'\" CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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'\"
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'\" THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
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'\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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'\" AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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'\" ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
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'\" PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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'\"
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'\" $Header: /user6/ouster/wish/man/RCS/GetFontStr.3,v 1.6 93/04/01 09:41:27 ouster Exp $ SPRITE (Berkeley)
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'\"
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.so man.macros
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.HS Tk_GetFontStruct tkc
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.BS
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.SH NAME
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Tk_GetFontStruct, Tk_NameOfFontStruct, Tk_FreeFontStruct \- maintain database of fonts
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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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XFontStruct *
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\fBTk_GetFontStruct(\fIinterp, tkwin, nameId\fB)\fR
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.sp
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char *
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\fBTk_NameOfFontStruct(\fIfontStructPtr\fB)\fR
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.sp
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\fBTk_FreeFontStruct(\fIfontStructPtr\fB)\fR
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.SH ARGUMENTS
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.AS "XFontStruct" *fontStructPtr
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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 font will be used.
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.AP Tk_Uid nameId in
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Name of desired font.
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.AP XFontStruct *fontStructPtr in
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Font structure to return name for or delete.
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.BE
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.SH DESCRIPTION
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.PP
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\fBTk_GetFont\fR loads the font indicated
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by \fInameId\fR and returns a pointer to information about the
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font. The pointer returned by \fBTk_GetFont\fR
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will remain valid until \fBTk_FreeFont\fR
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is called to release it.
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\fINameId\fR can be either a font name or pattern; any
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value that could be passed to \fBXLoadQueryFont\fR may be
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passed to \fBTk_GetFont\fR. If \fBTk_GetFont\fR is unsuccessful
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(because, for example, there is no font corresponding to
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\fInameId\fR) then it returns \fBNULL\fR and stores an error
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message in \fIinterp->result\fR.
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.PP
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\fBTk_GetFont\fR maintains a database of all fonts it has allocated.
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If the same \fInameId\fR is requested multiple times (e.g. by
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different windows or for different purposes), then additional
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calls for the same \fInameId\fR will be handled very quickly, without
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involving the X server. For this reason, it is generally better
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to use \fBTk_GetFont\fR in place of X library procedures like
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\fBXLoadQueryFont\fR.
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.PP
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The procedure \fBTk_NameOfFontStruct\fR is roughly the inverse of
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\fBTk_GetFontStruct\fR. If its \fIfontStructPtr\fR argument was created
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by \fBTk_GetFontStruct\fR, then the return value is the \fInameId\fR
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argument that was passed to \fBTk_GetFontStruct\fR to create the
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font. If \fIfontStructPtr\fR was not created by a call
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to \fBTk_GetFontStruct\fR, then the return value is a hexadecimal string
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giving the X identifier for the associated font.
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Note: the string returned by \fBTk_NameOfFontStruct\fR is
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only guaranteed to persist until the next call to \fBTk_NameOfFontStruct\fR.
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.PP
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When a font returned by \fBTk_GetFont\fR is no longer
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needed, \fBTk_FreeFont\fR should be called to release it.
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There should be exactly one call to \fBTk_FreeFont\fR for
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each call to \fBTk_GetFont\fR. When a font is no longer in
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use anywhere (i.e. it has been freed as many times as it has been gotten)
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\fBTk_FreeFont\fR will release it to the X server and delete it from
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the database.
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.SH KEYWORDS
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font
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