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Chapter 3
Using Visual Classes
A visual class (or visual) is the X Window System™
terminology to describe the characteristics of a display.
X defines the visual classes listed in this table.
Static classes do not support the use of a modifiable
colormap, but the corresponding dynamic classes do.
PseudoColor
is the most common display type. Some
applications run only on displays with a
PseudoColor
default visual class. When the Md4/PCI board is connected
to a grayscale monitor, you can configure it to emulate
PseudoColor
for applications by invoking the X Window
System with
PseudoColor
as the default visual class.
To emulate a PseudoColor visual class
To start the X server using
PseudoColor
as the default
visual class, add
defclass PseudoColor
to the
openwin
command and to the
Xservers
file.
For a one-headed system using the Md4/PCI board, type:
openwin -dev /dev/md4pci0.0 defclass PseudoColor
For a two-headed system using the Md4/PCI board, type:
openwin -dev /dev/md4pci0.0 defclass PseudoColor\
-dev /dev/md4pci0.1 defclass PseudoColor
X Visual Classes
Static Class
Dynamic Class
StaticGray
GrayScale
StaticColor
PseudoColor
TrueColor
DirectColor
When connected to a grayscale monitor, the Md4/PCI
board has a default visual class of
GrayScale
.
Summary of Contents for Dome Md4/PCI
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