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7.4. Fonts

Red Hat Linux uses two methods to manage fonts and display under XFree86. The newer Fontconfig font subsystem simplifies font management and provides advanced display features, such as anti-aliasing. This system is used automatically for applications programmed using the Qt 3 or GTK+ 2 graphical toolkit.

For compatibility, Red Hat Linux includes the original font subsystem, called the core X font subsystem. This system, which is over 15 years old, is based around the X Font Server (xfs).

This section discusses how to configure fonts for X using both systems.

7.4.1. Fontconfig

The Fontconfig font subsystem allows applications to directly access fonts on the system and use Xft or other rendering mechanisms to render Fontconfig fonts with advanced anti-aliasing. Graphical applications can use the Xft library with Fontconfig to draw text to the screen.

Over time, the Fontconfig/Xft font subsystem will replace the core X font subsystem.

ImportantImportant
 

The Fontconfig font subsystem does not yet work for OpenOffice.org and Abiword, which use their own font rendering technology.

It is important to note that Fontconfig share the /etc/fonts/fonts.conf configuration file, which replaces the /etc/X11/XftConfig. The Fontconfig configuration file should not be edited by hand.

TipTip
 

Due to the transition to the new font system, GTK+ 1.2 applications are not affected by any changes made via the Font Preferences dialog (accessed by selecting Main Menu Button [on the Panel] => Preferences => Font). For these applications, a font can be configured by adding the following lines to the file ~/.gtkrc.mine:

style "user-font" {

fontset = "<font-specification>"

}

widget_class "*" style "user-font"

Replace <font-specification> with a font specification in the style used by traditional X applications, such as -adobe-helvetica-medium-r-normal--*-120-*-*-*-*-*-*. A full list of core fonts can be obtained by running xlsfonts or created interactively using xfontsel.

7.4.1.1. Adding Fonts to Fontconfig

Adding new fonts to the Fontconfig subsystem is a straightforward process.

  1. To add fonts systemwide, copy the new fonts into the /usr/share/fonts/local/ directory.

    To add fonts for an individual user, copy the new fonts into the .fonts/ directory in the user's home directory.

  2. Use the fc-cache command to update the font information cache, as in the following example:

    4fc-cache <path-to-font-directory>

    In this command, replace <path-to-font-directory> with the directory containing the new fonts (either /usr/share/fonts/local/ or ~/.fonts/).

TipTip
 

Individual users may also install fonts graphically, by browsing to fonts:/// in Nautilus, and dragging the new font files there.

ImportantImportant
 

If the font filename ends with a .gz extension, it is compressed and cannot be used until uncompressed. To do this, use the gunzip command or double-click the file and drag the font to a directory in Nautilus.

7.4.2. Core X Font System

For compatibility, Red Hat Linux still provides the core X font subsystem, which uses the X Font Server (xfs) to provide fonts to X client applications.

The XFree86 server looks for a font server specified in the FontPath entry under the Files section of the /etc/X11/XF86Config configuration file. Refer to Section 7.3.1.4 Files for more information on the FontPath entry.

The XFree86 server connects to the xfs server on a specified port to acquire font information. For this reason, the xfs service must be running in order for X to start. For more on configuring services for a particular runlevel, refer to the chapter titled Controlling Access to Services in the Red Hat Linux Customization Guide.

7.4.2.1. xfs Configuration

The /etc/rc.d/init.d/xfs script starts the xfs server. Several options can be configured in the /etc/X11/fs/config file.

The following is a list of the more common options:

  • alternate-servers — Specifies a list of alternate font servers to be used if this font server is not available. A comma must separate every font server in the list.

  • catalogue — Specifies an ordered list of font paths to use. A comma must follow every font path before a new font path can be started in the list.

    Use the string :unscaled immediately after the font path to make the unscaled fonts in that path load first. Then specify the entire path again, so that other scaled fonts will also be loaded.

  • client-limit — Specifies the maximum number of clients the font server will service. The default is 10.

  • clone-self — Allows the font server to clone a new version of itself when the client-limit is hit. By default, this option is on.

  • default-point-size — Specifies the default point size for any font that does not specify this value. The value for this option is set in decipoints. The default of 120 corresponds to a 12 point font.

  • default-resolutions — Specifies a list of resolutions supported by the XFree86 server. Each resolution in the list must be separated by a comma.

  • deferglyphs — Specifies whether to defer loading glyphs (the graphic used to visually represent a font). To disable this feature use none, to enable this feature for all fonts use all, or to turn this this feature on only for 16-bit fonts use 16.

  • error-file — Specifies the path and file name of a location where xfs errors are logged.

  • no-listen — Prevents xfs from listening to particular protocols. By default, this option is set to tcp to prevent xfs from listening on TCP ports for security reasons. If using xfs to serve fonts over the network, remove this line.

  • port — Specifies the TCP port that xfs will listen on if no-listen does not exist or is commented out.

  • use-syslog — Specifies whether or not to use the system error log.

7.4.2.2. Adding Fonts to xfs

To add fonts to the core X font subsystem (xfs), follow these steps:

  1. If it does not already exist, create a directory called /usr/share/fonts/local/ using the following command as root:

    mkdir /usr/share/fonts/local/

    If creating the /usr/share/fonts/local/ directory is necessary, it must be added to the xfs path using the following command as root:

    chkfontpath --add /usr/share/fonts/local/ 
  2. Copy the new font file into the /usr/share/fonts/local/ directory

  3. Update the font information by issuing the following command as root:

    ttmkfdir -d /usr/share/fonts/local/ -o /usr/share/fonts/local/fonts.scale
  4. Restart the xfs font server using the following command as root:

    service xfs reload
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