FR: option for double-page layout in muPDF

[mergen3107]

Does your feature request involve difficulty completing a task? Please describe. I would like to have an option to show two pages at once in landscape mode in muPDF.

Describe the solution you'd like Similar to crengine's two columns option.

Describe alternatives you've considered For now I am using Page Browser with one row and two columns. However I use it a lot in crengine as well where I set 9 pages overview, and I need to change the layout each time I switch between the file types by swiping (it takes a while).

Additional context So in this double-pages mode I am not able to actually read text on 7,8-inch screen, of course, but it gives a good overview for repetitive plots. Page Browser has a lot of extra things around the pages, so it makes it harder to read. In the long term I plan to get a larger screen eReader, so this feature will be awesome to have.

[mergen3107]

@poire-z

With Kindle Scribe also being able to have KOReader now, does this FR have a chance to have attention? :D

[NiLuJe]

Probably not, our PDF backend is pain ;).

[poire-z]

Don't ask me, I'm not familiar with the PDF/Kopt/ReaderPaging stuff. (I guess if MuPDF/Kopt do not do it themselves, it would need us to combine 2 output, and adjust all x/y... so probably some quite heavy work.)

[mergen3107]

Alright, I will resort to Page Browser then :D

Thank you guys!

[gingerbeardman]

Came here to request this :(

[mergen3107]

@gingerbeardman We can ask upstream mupdf, I am just not sure they are willing to implement new features :D

[gingerbeardman]

I'll try.

Also I'm reading above: what is crengine? Can I use that? Edit: I now see that crengine is for epub, mupdf is for pdf

So it's clear my goal is to read magazines with two page spread.

[Frenzie]

We can ask upstream mupdf, I am just not sure they are willing to implement new features :D

I think they'd just say downstream should render two pages themselves. But you can always ask I suppose. :-P

[gingerbeardman]

insert jpg of two Spiderman pointing at each other

[mergen3107]

Let's reopen this issue since it gets more attention :D

[gingerbeardman]

I just read that apparently mupdf already supports it

core.setDisplayPages(2);

https://github.com/joniks/Android-MuPDF/blob/6d544a72e82ee89a48db965c7fa07f4c1b71274a/library/src/com/artifex/mupdflib/MuPDFActivity.java#L504

[benoit-pierre]

That's their Android App, not the core MuPDF library.

[gingerbeardman]

That's their Android App, not the core MuPDF library.

Interesting! I have tried their android app and it doesn't show two pages in Landscape.

[gingerbeardman]

I registered for MuPDF bug tracker and it's a WONTFIX for them to implement it

(in their own app? in the library?)

https://bugs.ghostscript.com/show_bug.cgi?id=702484

[Frenzie]

We can ask upstream mupdf, I am just not sure they are willing to implement new features :D

I think they'd just say downstream should render two pages themselves. But you can always ask I suppose. :-P

But more seriously, then it also wouldn't work in DjVu or picture documents (like GIF or TIFF), so it makes a lot more sense to do it somewhere around here regardless.