rockbox/manual/advanced_topics/viewports/grayscale-conditional.tex

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\begin{example}
%?C<%Vda|%Vdb>
%Vl|a|10|10|50|50|-|-|-|
%Cl|0|0|50|50|
%C
%Vl|a|0|70|70|14|1|-|-|
%s%acThere you have it: Album art.
%Vl|b|20|14|50|14|1|2|-|
%t1%acWarning:;%t.1
%Vl|b|20|30|50|50|1|-|-|
%sNo album art found
%scheck your filenames.
\end{example}
This example checks for album art. Album art will be displayed in viewport 'a', if
it is found. Otherwise a flashing warning will be displayed in viewport 'b'.