Le dimanche 26 février 2023 à 4:53 AM, Kevin Kofler <kevin.kof...@chello.at> a écrit :
> Carl Schwan wrote: > > > I want to move Arianna to KDE review. Arianna is an ebook reader > > currently only supporting epubs. This is based on top of epub.js > > and QtWebEngine for the actualy rendering of ebooks as doing that > > from scratch in Qt would be too much work. > > > Okular has an EPub backend using libepub and QTextDocument. How does > Arianna compare to that? I would expect native code to be more efficient > than JavaScript especially on mobile devices, which are apparently > Arianna's main target. But I do not know whether there are, e.g., EPub > documents that Arianna can render and Okular cannot, so that is why I am > asking how they compare. Okular QTextDocument is quite inefficient see for example this long standing bug: https://bugs.kde.org/show_bug.cgi?id=359932 Aside from being quite inefficient, QTextDocument has only some basic HTML support and to have a good support of Epubs you basically need a much better HTML/CSS support which only a web engine can provide. If someone wants to try to optimize the native code of Okular, they should probably replace the old C and unmaintained based libepub library and replace it with [1] and [2] which should provide a better starting point. (and nope, I'm not gonna do it, I'm already too busy with other things). Carl [1]: https://invent.kde.org/graphics/arianna/-/blob/master/src/epubcontainer.cpp [2]: https://github.com/sandsmark/epubreader/blob/master/epubdocument.cpp
