315 lines
11 KiB
Groff
315 lines
11 KiB
Groff
.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1994, 1996 X Consortium
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.\"
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.\" Permission is hereby granted, free of charge, to any person obtaining
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.\" a copy of this software and associated documentation files (the
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.\" "Software"), to deal in the Software without restriction, including
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.\" without limitation the rights to use, copy, modify, merge, publish,
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.\" distribute, sublicense, and/or sell copies of the Software, and to
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.\" permit persons to whom the Software is furnished to do so, subject to
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.\" the following conditions:
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.\"
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.\" The above copyright notice and this permission notice shall be included
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.\" in all copies or substantial portions of the Software.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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.\" IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
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.\" OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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.\" ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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.\" OTHER DEALINGS IN THE SOFTWARE.
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.\"
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.\" Except as contained in this notice, the name of the X Consortium shall
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.\" not be used in advertising or otherwise to promote the sale, use or
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.\" other dealings in this Software without prior written authorization
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.\" from the X Consortium.
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.\"
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.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991 by
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.\" Digital Equipment Corporation
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.\"
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.\" Portions Copyright \(co 1990, 1991 by
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.\" Tektronix, Inc.
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.\"
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.\" Permission to use, copy, modify and distribute this documentation for
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.\" any purpose and without fee is hereby granted, provided that the above
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.\" copyright notice appears in all copies and that both that copyright notice
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.\" and this permission notice appear in all copies, and that the names of
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.\" Digital and Tektronix not be used in in advertising or publicity pertaining
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.\" to this documentation without specific, written prior permission.
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.\" Digital and Tektronix makes no representations about the suitability
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.\" of this documentation for any purpose.
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.\" It is provided ``as is'' without express or implied warranty.
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.\"
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.\"
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.ds xT X Toolkit Intrinsics \- C Language Interface
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.ds xW Athena X Widgets \- C Language X Toolkit Interface
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.ds xL Xlib \- C Language X Interface
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.ds xC Inter-Client Communication Conventions Manual
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.na
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.de Ds
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.nf
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.\\$1D \\$2 \\$1
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.ft CW
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.\".ps \\n(PS
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.\".if \\n(VS>=40 .vs \\n(VSu
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.\".if \\n(VS<=39 .vs \\n(VSp
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..
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.de De
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.ce 0
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.if \\n(BD .DF
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.nr BD 0
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.in \\n(OIu
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.if \\n(TM .ls 2
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.sp \\n(DDu
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.fi
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..
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.de IN \" send an index entry to the stderr
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..
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.de Pn
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.ie t \\$1\fB\^\\$2\^\fR\\$3
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.el \\$1\fI\^\\$2\^\fP\\$3
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..
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.de ZN
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.ie t \fB\^\\$1\^\fR\\$2
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.el \fI\^\\$1\^\fP\\$2
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..
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.de hN
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.ie t <\fB\\$1\fR>\\$2
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.el <\fI\\$1\fP>\\$2
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..
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.ny0
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.TH XCreateFontSet __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS"
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.SH NAME
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XCreateFontSet, XFreeFontSet \- create and free an international text drawing font set
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.SH SYNTAX
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.HP
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XFontSet XCreateFontSet\^(\^Display *\fIdisplay\fP\^, char
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*\fIbase_font_name_list\fP\^, char ***\fImissing_charset_list_return\fP\^, int
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*\fImissing_charset_count_return\fP\^, char **\fIdef_string_return\fP\^);
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.HP
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void XFreeFontSet\^(\^Display *\fIdisplay\fP\^, XFontSet \fIfont_set\fP\^);
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.SH ARGUMENTS
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.IP \fIdisplay\fP 1i
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Specifies the connection to the X server.
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.IP \fIbase_font_name_list\fP 1i
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Specifies the base font names.
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.IP \fIdef_string_return\fP 1i
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Returns the string drawn for missing charsets.
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.IP \fIfont_set\fP 1i
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Specifies the font set.
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.IP \fImissing_charset_count_return\fP 1i
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Returns the number of missing charsets.
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.IP \fImissing_charset_list_return\fP 1i
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Returns the missing charsets.
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.SH DESCRIPTION
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The
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.ZN XCreateFontSet
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function creates a font set for the specified display.
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The font set is bound to the current locale when
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.ZN XCreateFontSet
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is called.
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The font set may be used in subsequent calls to obtain font
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and character information and to image text in the locale of the font set.
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.LP
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The base_font_name_list argument is a list of base font names
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that Xlib uses to load the fonts needed for the locale.
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The base font names are a comma-separated list.
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The string is null-terminated
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and is assumed to be in the Host Portable Character Encoding;
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otherwise, the result is implementation-dependent.
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White space immediately on either side of a separating comma is ignored.
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.LP
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Use of XLFD font names permits Xlib to obtain the fonts needed for a
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variety of locales from a single locale-independent base font name.
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The single base font name should name a family of fonts whose members
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are encoded in the various charsets needed by the locales of interest.
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.LP
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An XLFD base font name can explicitly name a charset needed for the locale.
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This allows the user to specify an exact font for use with a charset required
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by a locale, fully controlling the font selection.
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.LP
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If a base font name is not an XLFD name,
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Xlib will attempt to obtain an XLFD name from the font properties
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for the font.
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If this action is successful in obtaining an XLFD name, the
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.ZN XBaseFontNameListOfFontSet
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function will return this XLFD name instead of the client-supplied name.
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.LP
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Xlib uses the following algorithm to select the fonts
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that will be used to display text with the
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.ZN XFontSet .
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.LP
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For each font charset required by the locale,
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the base font name list is searched for the first appearance of one
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of the following cases that names a set of fonts that exist at the server:
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.IP \(bu 5
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The first XLFD-conforming base font name that specifies the required
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charset or a superset of the required charset in its
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.ZN CharSetRegistry
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and
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.ZN CharSetEncoding
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fields.
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The implementation may use a base font name whose specified charset
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is a superset of the required charset, for example,
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an ISO8859-1 font for an ASCII charset.
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.IP \(bu 5
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The first set of one or more XLFD-conforming base font names
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that specify one or more charsets that can be remapped to support the
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required charset.
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The Xlib implementation may recognize various mappings
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from a required charset to one or more other charsets
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and use the fonts for those charsets.
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For example, JIS Roman is ASCII with tilde and backslash replaced
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by yen and overbar;
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Xlib may load an ISO8859-1 font to support this character set
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if a JIS Roman font is not available.
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.IP \(bu 5
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The first XLFD-conforming font name or the first non-XLFD font name
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for which an XLFD font name can be obtained, combined with the
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required charset (replacing the
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.ZN CharSetRegistry
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and
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.ZN CharSetEncoding
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fields in the XLFD font name).
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As in case 1,
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the implementation may use a charset that is a superset
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of the required charset.
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.IP \(bu 5
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The first font name that can be mapped in some implementation-dependent
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manner to one or more fonts that support imaging text in the charset.
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.LP
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For example, assume that a locale required the charsets:
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.LP
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.Ds 0
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ISO8859-1
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JISX0208.1983
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JISX0201.1976
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GB2312-1980.0
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.De
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.LP
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The user could supply a base_font_name_list that explicitly specifies the
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charsets, ensuring that specific fonts are used if they exist.
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For example:
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.LP
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.Ds 0
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"-JIS-Fixed-Medium-R-Normal--26-180-100-100-C-240-JISX0208.1983-0,\\
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-JIS-Fixed-Medium-R-Normal--26-180-100-100-C-120-JISX0201.1976-0,\\
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-GB-Fixed-Medium-R-Normal--26-180-100-100-C-240-GB2312-1980.0,\\
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-Adobe-Courier-Bold-R-Normal--25-180-75-75-M-150-ISO8859-1"
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.De
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.LP
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Alternatively, the user could supply a base_font_name_list
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that omits the charsets,
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letting Xlib select font charsets required for the locale.
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For example:
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.LP
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.Ds 0
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"-JIS-Fixed-Medium-R-Normal--26-180-100-100-C-240,\\
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-JIS-Fixed-Medium-R-Normal--26-180-100-100-C-120,\\
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-GB-Fixed-Medium-R-Normal--26-180-100-100-C-240,\\
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-Adobe-Courier-Bold-R-Normal--25-180-100-100-M-150"
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.De
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.LP
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Alternatively, the user could simply supply a single base font name
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that allows Xlib to select from all available fonts
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that meet certain minimum XLFD property requirements.
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For example:
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.LP
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.Ds 0
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"-*-*-*-R-Normal--*-180-100-100-*-*"
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.De
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.LP
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If
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.ZN XCreateFontSet
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is unable to create the font set,
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either because there is insufficient memory or because the current locale
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is not supported,
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.ZN XCreateFontSet
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returns NULL, missing_charset_list_return is set to NULL,
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and missing_charset_count_return
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is set to zero.
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If fonts exist for all of the charsets required by the current locale,
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.ZN XCreateFontSet
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returns a valid
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.ZN XFontSet ,
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missing_charset_list_return is set to NULL,
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and missing_charset_count_return is set to zero.
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.LP
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If no font exists for one or more of the required charsets,
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.ZN XCreateFontSet
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sets missing_charset_list_return to a
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list of one or more null-terminated charset names for which no font exists
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and sets missing_charset_count_return to the number of missing fonts.
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The charsets are from the list of the required charsets for
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the encoding of the locale and do not include any charsets to which Xlib
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may be able to remap a required charset.
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.LP
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If no font exists for any of the required charsets
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or if the locale definition in Xlib requires that a font exist
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for a particular charset and a font is not found for that charset,
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.ZN XCreateFontSet
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returns NULL.
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Otherwise,
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.ZN XCreateFontSet
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returns a valid
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.ZN XFontSet
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to font_set.
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.LP
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When an Xmb/wc drawing or measuring function is called with an
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.ZN XFontSet
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that has missing charsets, some characters in the locale will not be
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drawable.
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If def_string_return is non-NULL,
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.ZN XCreateFontSet
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returns a pointer to a string that represents the glyphs
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that are drawn with this
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.ZN XFontSet
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when the charsets of the available fonts do not include all font glyphs
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required to draw a codepoint.
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The string does not necessarily consist of valid characters
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in the current locale and is not necessarily drawn with
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the fonts loaded for the font set,
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but the client can draw and measure the default glyphs
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by including this string in a string being drawn or measured with the
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.ZN XFontSet .
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.LP
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If the string returned to def_string_return is the empty string ("\^"),
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no glyphs are drawn, and the escapement is zero.
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The returned string is null-terminated.
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It is owned by Xlib and should not be modified or freed by the client.
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It will be freed by a call to
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.ZN XFreeFontSet
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with the associated
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.ZN XFontSet .
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Until freed, its contents will not be modified by Xlib.
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.LP
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The client is responsible for constructing an error message from the
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missing charset and default string information and may choose to continue
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operation in the case that some fonts did not exist.
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.LP
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The returned
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.ZN XFontSet
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and missing charset list should be freed with
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.ZN XFreeFontSet
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and
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.ZN XFreeStringList ,
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respectively.
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The client-supplied base_font_name_list may be freed
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by the client after calling
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.ZN XCreateFontSet .
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.LP
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The
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.ZN XFreeFontSet
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function frees the specified font set.
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The associated base font name list, font name list,
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.ZN XFontStruct
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list, and
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.ZN XFontSetExtents ,
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if any, are freed.
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.SH "SEE ALSO"
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XExtentsofFontSet(__libmansuffix__),
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XFontsOfFontSet(__libmansuffix__),
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XFontSetExtents(__libmansuffix__)
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.br
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\fI\*(xL\fP
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