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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)
- '\"
- .\" The definitions below are for supplemental macros used in Tcl/Tk
- .\" manual entries.
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- .\" section names.
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- .HS Tk_GetFontStruct tkc
- .BS
- .SH NAME
- Tk_GetFontStruct, Tk_NameOfFontStruct, Tk_FreeFontStruct \- maintain database of fonts
- .SH SYNOPSIS
- .nf
- \fB#include <tk.h>\fR
- .sp
- XFontStruct *
- \fBTk_GetFontStruct(\fIinterp, tkwin, nameId\fB)\fR
- .sp
- char *
- \fBTk_NameOfFontStruct(\fIfontStructPtr\fB)\fR
- .sp
- \fBTk_FreeFontStruct(\fIfontStructPtr\fB)\fR
- .SH ARGUMENTS
- .AS "XFontStruct" *fontStructPtr
- .AP Tcl_Interp *interp in
- Interpreter to use for error reporting.
- .AP Tk_Window tkwin in
- Token for window in which font will be used.
- .AP Tk_Uid nameId in
- Name of desired font.
- .AP XFontStruct *fontStructPtr in
- Font structure to return name for or delete.
- .BE
-
- .SH DESCRIPTION
- .PP
- \fBTk_GetFont\fR loads the font indicated
- by \fInameId\fR and returns a pointer to information about the
- font. The pointer returned by \fBTk_GetFont\fR
- will remain valid until \fBTk_FreeFont\fR
- is called to release it.
- \fINameId\fR can be either a font name or pattern; any
- value that could be passed to \fBXLoadQueryFont\fR may be
- passed to \fBTk_GetFont\fR. If \fBTk_GetFont\fR is unsuccessful
- (because, for example, there is no font corresponding to
- \fInameId\fR) then it returns \fBNULL\fR and stores an error
- message in \fIinterp->result\fR.
- .PP
- \fBTk_GetFont\fR maintains a database of all fonts it has allocated.
- If the same \fInameId\fR is requested multiple times (e.g. by
- different windows or for different purposes), then additional
- calls for the same \fInameId\fR will be handled very quickly, without
- involving the X server. For this reason, it is generally better
- to use \fBTk_GetFont\fR in place of X library procedures like
- \fBXLoadQueryFont\fR.
- .PP
- The procedure \fBTk_NameOfFontStruct\fR is roughly the inverse of
- \fBTk_GetFontStruct\fR. If its \fIfontStructPtr\fR argument was created
- by \fBTk_GetFontStruct\fR, then the return value is the \fInameId\fR
- argument that was passed to \fBTk_GetFontStruct\fR to create the
- font. If \fIfontStructPtr\fR was not created by a call
- to \fBTk_GetFontStruct\fR, then the return value is a hexadecimal string
- giving the X identifier for the associated font.
- Note: the string returned by \fBTk_NameOfFontStruct\fR is
- only guaranteed to persist until the next call to \fBTk_NameOfFontStruct\fR.
- .PP
- When a font returned by \fBTk_GetFont\fR is no longer
- needed, \fBTk_FreeFont\fR should be called to release it.
- There should be exactly one call to \fBTk_FreeFont\fR for
- each call to \fBTk_GetFont\fR. When a font is no longer in
- use anywhere (i.e. it has been freed as many times as it has been gotten)
- \fBTk_FreeFont\fR will release it to the X server and delete it from
- the database.
-
- .SH KEYWORDS
- font
-