About libtiff

Julien Nabet serval2412 at yahoo.fr
Tue Apr 19 09:30:07 UTC 2022


I noticed some bugs about dealing with TIFF images (see 
https://bugs.documentfoundation.org/show_bug.cgi?id=126152 for the meta).

According to https://en.wikipedia.org/wiki/TIFF, TIFF is quite complex, 
I quote:

"TIFF is a complex format, defining many tags of which typically only a 
few are used in each file. This led to implementations supporting very 
varying subsets of the format, a situation that gave rise to the joke 
that TIFF stands for /Thousands of Incompatible File Formats/.".

So in https://gerrit.libreoffice.org/c/core/+/133108, I wondered if we 
could use Libtiff. Of course asTomaž indicated it'll need lots of work. 
However Mike pointed out Luboš' commit about Webp to take example

("support for the WebP image format (tdf#114532 
<https://bugs.documentfoundation.org/show_bug.cgi?id=114532>)") which 
can be a start.

But before this, is libtiff license compatible?

I mean, I retrieved source code of libtiff and m4/acinclude.m4 indicates 
(from line 192):

dnl   This program is free software; you can redistribute it and/or 
modify it
dnl   under the terms of the GNU General Public License as published by the
dnl   Free Software Foundation; either version 2 of the License, or (at your
dnl   option) any later version.

If I remember well, GPL isn't sufficient, we also need LGPL, don't we?


PS : it's just a question for devs who would be interested in doing the 
porting, I wouldn't be able to do this myself.
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