LibreOfficeLight / iOS

jan iversen jani at
Fri Dec 29 07:38:43 UTC 2017


adding dev list to reply, so that others might benefit from the info.

Hope you don't mind the unsolicited email, I figured you were the guy to
> talk to about this from the git commits.
I am working actively on creating a version of LO for the iPad.

So I got it compiling via lode, with just a couple of hitches (had to
> install libassuan, had to make sure to use the make out of lode, and there
> is a hard coded LIBRARY_SEARCH_PATH to /Users/jani/... in the ios project
> file)
I do not understand why you had to install extra libraries. I work on high
sierra with xcode 9 and have not installed that library.

The LIBRARY_SEARCH_PATH should be overwritten by the xcconfig file, but I
will need to check that.

There are 2 projects, but I assume you talk about the kit project?

> 1. The app doesnt actually attempt to render yet? Were you planning on
> using CATiledLayer for that? I've used it a couple of times (for PDFs)...
> it's fun

No it doesn’t. As you probably have seen the render function is near empty,
I am strugling to find out what the tiled calls returns and how to use that
in the swift app.

2. The static lib, and the compiled app, are pretty fat. (At least in debug
> for the simulator - ~400mb, I havent tried the release build yet). Too fat
> to embed in my app, it would have to be a separate app. Any insight as to
> whether this could ever be cut down to a reasonable size?
Well is it actually quite reduced. LO is simply big.

3. The link time on the app is outrageously slow at the moment - at least
> on my macbook pro - I guess this is related to the size and number of
> symbols in the static lib. That's what the dummy.c file is all about? Needs
> to be quarantined from the app somehow.  Perhaps by keeping it in a
> Framework project? Or cutting down its size. I was too scared to turn on
> LTO...
The link time is my biggest problem, linking the kit is a fraction of
linking the app, and It seems to be the swift interface that is the problem.

dummy.c is to link without the kit, and it is automatically quarantined,
look in build phases, where you will see it is not being compiled.

4. Just wondering the reasoning for starting a new C interface into
> LibreOfficeKit (eg BridgeLOkit_* )?
How else would you make a C/C++ interface for swift ?

I had success in talking to the main LibreOfficeKit.h file directly from
> swift by including it in the bridging file. Using it directly would take
> away a lot of duplication needed to flesh out BridgeLOkit. Granted the main
> C api isnt that friendly to use, but IMHO it would be better to do the
> wrapping and making the API friendly on the Swift side, rather than another
> layer of C, which then still needs swift friendly classes around it.
> The main problem is with the way LibreOfficeKitInit works (which seems
> weird...), for which I reused BridgeLOkit_Init and added a func to get
> the pointer to kit out.
> See the attached LibreOfficeKitWrapper.swift file - it has just a couple
> wrapped functions done but you can see what I mean. Needs the rest filled
> in and memory handling done.
Functions not declared in the bridge are unlikely to work in swift
(according to the swift documentation).

> I've done this before for Pdfium - which also has a C based FFI. We
> created a framework called PdfiumSwift which had swift classes like
> PDFDocument, PDFPage etc which wrapped the C interface and made consuming
> it easy in Swift. We hooked the memory management off the swift deinit()
> etc.  It used an internal private module to consume the C API so it was
> just the Swift API exposed outside of the framework / module.
this is basically the same the kit project does, except it does not use

jan i

> Once the basic wrapping is done, then these classes provide a good place
> to add stuff like converting the raw tiles into iOS friendly bitmaps etc.
> Anyway, good job on getting it this far, and happy new year.
> Cheers
> Jon Nermut
Sent from My iPad, sorry for any misspellings.
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