Add viewports to the manual. Adapted from FS#9934 by Jonas Häggqvist and FS#10553 by David Kauffmann
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22756 a1c6a512-1295-4272-9138-f99709370657
diff --git a/manual/advanced_topics/viewports/grayscale-uivp-syntax.tex b/manual/advanced_topics/viewports/grayscale-uivp-syntax.tex
new file mode 100644
index 0000000..3b420ce
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+++ b/manual/advanced_topics/viewports/grayscale-uivp-syntax.tex
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+ \begin{itemize}
+ \item 'fgshade' and bgshade are numbers in the range '0' (= black) to '3'
+ (= white).
+ \item 'font' is a number - '0' is the built-in system font, '1' is the
+ user-selected font.
+ \end{itemize}
+
+\begin{example}
+ \config{ui viewport: 15,20,100,150,-,-,-}
+\end{example}
+his displays the menu starting at 15px from the left of the screen and 20px
+from the top of the screen. It is 100px wide and 150px high.
+The font and the foreground/background shades are defined in the theme
+\fname{.cfg} file or in the \setting{Theme Settings} menu.