Fonts; Fontconfig - Red Hat ENTERPRISE LINUX 5 - DEPLOYMENT Deployment Manual

Chapter 31. The X Window System
• SubSection "Display" — Specifies the screen modes available at a particular color depth. The
Screen section can have multiple Display subsections, which are entirely optional since screen
modes are automatically detected.
This subsection is normally used to override autodetected modes.
• Option "<option-name>" — An optional entry which specifies extra parameters for the section.
Replace <option-name> with a valid option listed for this section in the xorg.conf man page.
31.3.1.10. DRI
The optional DRI section specifies parameters for the Direct Rendering Infrastructure (DRI). DRI is
an interface which allows 3D software applications to take advantage of 3D hardware acceleration
capabilities built into most modern video hardware. In addition, DRI can improve 2D performance via
hardware acceleration, if supported by the video card driver.
This section rarely appears, as the DRI Group and Mode are automatically initialized to default values.
If a different Group or Mode is desired, then adding this section to the xorg.conf file will override
those defaults.
The following example illustrates a typical DRI section:
Section "DRI" Group 0 Mode 0666 EndSection
Since different video cards use DRI in different ways, do not add to this section without first referring to
http://dri.sourceforge.net/.

31.4. Fonts

Red Hat Enterprise Linux uses two subsystems to manage and display fonts under X: Fontconfig and
xfs.
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 Enterprise 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.

31.4.1. 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 replaces the core X font subsystem.
Important
The Fontconfig font subsystem does not yet work for OpenOffice.org, which uses its own
font rendering technology.
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