Re: About libtiff

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Hello Julien,

On Tue, Apr 19, 2022 at 11:30 AM Julien Nabet <serval2412@xxxxxxxx> wrote:

Hello,

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 as Tomaž indicated it'll need lots of work. However Mike pointed out Luboš' commit about Webp to take example

https://cgit.freedesktop.org/libreoffice/core/commit/?id=60eaa424c5e213f31227008e1ed66a646491a360 ("support for the WebP image format (tdf#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?


You quoted the license of GNU Autoconf. Libtiff has a BSD-like licence. https://gitlab.com/libtiff/libtiff/-/blob/master/COPYRIGHT

Best regards,
Andras

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