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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 Backgrounds},%
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pdfsubject={CentOS Corporate Visual Identity}%
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}
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\title{Backgrounds}
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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 GNOME and KDE background images. The first
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time a user's session has been loaded, the default background image is
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shown on the screen as desktop background. Background image remains
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visible in the screen as long as the user's session remains open.
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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/Backgrounds/
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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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Background design is based on CentOS Default Artistic Motif.
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\begin{itemize}
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\item There is no color limitation in this section.
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\item There is no translation in these images.
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\item There is no version, or textual information in these images.
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\end{itemize}
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\section{Rendering}
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\section{Configuration}
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\input{table-config.tex}
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\begin{description}
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\item[Default background]: The
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\texttt{desktop\_gnome\_background.schemas} and \texttt{\%gconf-tree.xml}
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files control which is the default background image loaded when new
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users open their GNOME session for first time and as long as no change
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be made in its ``Desktop Background Preferences''.
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Inside \texttt{desktop\_gnome\_background.schemas} file the default
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background image is defined in the line 6 of the following piece of
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code:
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\begin{verbatim}
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...
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1| <schema>
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2| <key>/schemas/desktop/gnome/background/picture_filename</key>
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3| <applyto>/desktop/gnome/background/picture_filename</applyto>
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4| <owner>gnome</owner>
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5| <type>string</type>
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6| <default>/usr/share/backgrounds/images/default.png</default>
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7| <locale name="C">
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8| <short>Picture Filename</short>
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9| <long>File to use for the background image</long>
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10| </locale>
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11|
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...
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\end{verbatim}
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Inside \texttt{\%gconf-tree.xml} file, the default background image is
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defined in the line 4 of the following piece of code:
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\begin{verbatim}
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...
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1| <entry name="picture_filename" mtime="1204075267" type="schema" stype="string" owner="gnome">
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2| <local_schema locale="C" short_desc="Picture Filename">
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3| <default type="string">
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4| <stringvalue>/usr/share/backgrounds/images/default.png</stringvalue>
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5| </default>
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6| <longdesc>File to use for the background image</longdesc>
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7| </local_schema>
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8| </entry>
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...
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\end{verbatim}
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In both files \texttt{desktop\_gnome\_background.schemas} and
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\texttt{\%gconf-tree.xml}, the image file name should be the same.
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The \texttt{kdesktoprc} file controls KDE desktop configuration file.
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The following lines were taken from that file and show the variables
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that control default background on KDE desktop.
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\begin{verbatim}
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Wallpaper=/usr/share/backgrounds/images/default.png
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WallpaperMode=Scaled
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\end{verbatim}
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\end{description}
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\section{Testing}
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\section{Issues}
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\begin{description}
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\item[Image format definition]: Images controlling default desktop
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backgrounds are in JPG format. Nevertheless this doesn't match with
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the definition in the configuration file
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\texttt{desktop-backgrounds-basic.xml} which mention them as PNG format.
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This issue makes those images not to be displayed in the GNOME
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``Desktop Background Preferences''.
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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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