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\documentclass{article}
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\usepackage{longtable}
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\usepackage[pdftex]{graphicx}
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\usepackage{hyperref}
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\hypersetup{pdfauthor={CentOS Documentation SIG},%
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pdftitle={GNOME Display Manager (GDM)},%
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pdfsubject={CentOS Corporate Visual Identity}%
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}
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\title{GNOME Display Manager (GDM)}
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\author{CentOS Documentation SIG}
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\begin{document}
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\maketitle
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\begin{abstract}
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This article describes the GDM Visual Style for CentOS Distribution.
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GDM is the first choice defined as CentOS Display Manager (DM). If
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users leave their computers on all the time and don't share their
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system, they won't see this as often as users who share a desktop
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system with other users on the system or laptop users who reboot and
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login more frequently.
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Copyright \copyright\ 2010\ The CentOS Project. Permission is
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granted to copy, distribute and/or modify this document under the
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terms of the GNU Free Documentation License, Version 1.2 or any later
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version published by the Free Software Foundation; with no Invariant
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Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the
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license is included in the section entitled ``GNU Free Documentation
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License''.
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\end{abstract}
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\tableofcontents
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\section{Workplace}
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\begin{itemize}
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\item SVN:trunk/Identity/Themes/\$THEME/Distro/BootUp/GDM/
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\item SVN:trunk/Translations/Identity/Themes/Distro/BootUp/GDM/
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\item SVN:trunk/Scripts/Identity/Themes/Distro/BootUp/GDM/
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\end{itemize}
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\section{Theme}
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\input{table-theme.tex}
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\section{Design}
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The centos-release.png and screenshot.png images are rendered for each
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major release of CentOS. This task is done using the rendering script
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(render.sh) available in the workplace. This script creates the
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appropriate PNG images under img/\$VERSION/ directory.
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The background.png image is taken from Backgrounds section. This task
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is done using the building script(build.sh) available in the
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workplace. This script collects all information, groups it and stores
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it under tgz/\$VERSION/\$RESOLUTION/ with the form \$THEME.tar.gz.
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Whith the building script you can create GDM themes for specific
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CentOS major releases, and inside each major release for specific
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screen resolutions.
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More information about GDM theming is available in the \emph{GNOME
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Display Manager Reference Manual}. This guide is available online and
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inside your system's help. As shortcut to get that help, you can run
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the following command:
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\begin{itemize}
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\item gnome-help file:///usr/share/gnome/help/gdm/C/gdm.xml\#thememanual
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\end{itemize}
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\section{Configuration}
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\begin{description}
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\item[GraphicalTheme]: The graphical theme that the Themed Greeter
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should use. It should refer to a directory in the theme directory set
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by \emph{GraphicalThemeDir}.
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\texttt{GraphicalTheme=\$THEME}\\
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\item[GraphicalThemeDir]: The directory where themes for the Themed
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Greeter are installed.
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\texttt{GraphicalThemeDir=/usr/share/gdm/themes/}
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\item[BackgroundColor]: The Standard greeter (gdmlogin) background
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color. If the BackgroundType is 2, use this color in the background of
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the greeter. Also use it as the back of transparent images set on the
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background and if the BackgroundRemoteOnlyColor is set and this is a
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remote display. This only affects the GTK+ Greeter.
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\texttt{BackgroundColor=\#204C8D}
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\item[GraphicalThemeColor]: Use this color in the background of the
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Themed Greeter. This only affects the Themed Greeter.
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\texttt{GraphicalThemeColor=\#000000}
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\end{description}
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More information about GDM and its configuration can be found in its
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reference guide. As shortcut to get that help, you can run the
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following command:
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\begin{itemize}
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\item gnome-help file:///usr/share/gnome/help/gdm/C/gdm.xml\#index
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\end{itemize}
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\section{Rendering}
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\section{Testing}
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\section{Issues}
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\begin{description}
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\item[Transition from Greeter to Desktop]: This seems to be available
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when using the variable \emph{BackgroundImage} in GTK+ Greeter only.
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In Themed Greeter the best we have is the variable
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\emph{GraphicalThemedColor} to specify the background color of the
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transition.
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\item[Different resolutions]: Designing of GDM theme needs to be
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expandable through different screen resolutions. By default, GDM theme
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uses a background image of 2048x1536 pixels. When screen resolution
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changes the predifined behaviour is to scale this image to fit the
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current display resolution. If the screen resolution is higher, or
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differs in ratio (for example when it a wide screens) the design of
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GDM them could loose quality or look different from the original one.
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As a workaround, if GDM theme looks narrow or deformed to you, use the
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building script to create the GDM theme in your specific screen
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resolution.
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\item[GDM theme installation]: Use the login screen administrator
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(gdmsetup). This action requires you to have \emph{root} privileges.
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\item[Default Display Manager]: By default GDM is the first display
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manager choice\footnote{See the file /etc/X11/prefdm.}. If you
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changed this and want to go back then, run the following command (as
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\emph{root}) and reboot:
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\texttt{echo "DISPLAYMANAGER=GNOME" > /etc/sysconfig/desktop}
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\end{description}
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% License section
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\input{../../../../../Licenses/GFDL.tex}
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\end{document}
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