Installing X-frame buffer
Xvfb is an X-Windows server that has neither a graphics card nor a physical graphics display. iHub uses the X-Server for font-rendering information and to generate graphics in documents. Normally, an X-Server requires a graphics card and physical graphics display on the BIRT iHub machine, but you can use Xvfb in place of these components.
The Xvfb software installed with iHub includes Type 1 fonts. Actuate maps these fonts to Microsoft Windows fonts for consistent graphics rendering on the various platforms.
The Xvfb software requires:
X libraries installed on the iHub machine
If you choose to install Xvfb, the installation script searches for the required libraries and displays a message if the install script cannot find the required libraries on the machine.
Variables set to the path of the Xvfb libraries
XVFBDISPLAY variable in start_srvr.sh.
display_value in pmd11.sh.
To view and print the documents from iHub, you need to set these variables only if you install Xvfb software yourself.
The DISPLAY environment variable specifies the X-Windows server used by the BIRT iHub machine. For example, if the BIRT iHub machine is running X‑Windows, it sets DISPLAY to the local machine:
# setenv DISPLAY :0.0
If you use a separate machine as the X-Windows server, specify the machine name in the environment variable DISPLAY. The following example sets DISPLAY to use an X-Windows server on a machine named urup:
# setenv DISPLAY urup:0.0
The original source code for Xvfb is included as a component of X11R6, but not in earlier X-Window system releases.