eot embedded fonts

[Lubos Lunak]

On Tuesday 27 of August 2013, Brennan T Vincent wrote:
> Hi all,
>
> One of the most commonly-occurring problems with .pub import is the fact
> that we don't respect embedded fonts. Now that LibreOffice supports
> embedded fonts, it should be possible to make this work.

 That depends. EOT is a Microsoft proprietary font format (which has been 
submitted to W3C, but AFAICT pretty much everybody else ignores it). There 
are tools to convert e.g. TTF fonts to EOT, but I couldn't find absolutely 
anything that'd convert from EOT and the only thing capable of at least 
reading it is MS Windows itself. As far as I understand it, the available 
documentation on it is unsufficient for implementing a reader if you'd decide 
it'd be worth the effort (I'm not entirely sure on this part, feel free to do 
your own research).

 Here are some links that I found on the topic:

http://blog.yezhucn.com/gdi/t2embed_TTLoadEmbeddedFont.htm
http://www.pptfaq.com/FAQ00076_Embedding_fonts.htm

http://graphicdesign.stackexchange.com/questions/16234/are-there-any-free-tools-to-convert-eot-files-to-ttf-otf-or-any-other-font-f
http://www.w3.org/Submission/2008/SUBM-EOT-20080305/
http://www.w3.org/Submission/2008/SUBM-MTX-20080305/
http://lists.w3.org/Archives/Public/www-style/2008Apr/0227.html
http://securitylabs.websense.com/content/Blogs/3114.aspx

> A few questions:
>
> (1) Do we support Embedded OpenType fonts currently? (.eot)

 No.

> (2) If not (which I suspect), I can contribute some code to do this.
> Microsoft and Monotype recently granted a perpetual, irrevocable free
> patent and copyright license to implement the .eot format, so there should
> be no legal issues. I have written a C library to convert from .eot to .ttf
> and would like to know who to talk to in order to get this included in
> LibreOffice.

 Yes, adding support for export should be fairly easy, given that TTF->EOT 
conversion is possible, but that's the easier part and it doesn't really help 
LO much.

 A kind of limited import support should be also doable, as the Windows 
TTLoadEmbeddedFont() function can load such a font for use (unlike the normal 
Windows function for opening fonts). See the attached hackish proof of 
concept patch. That'd make import of it Windows-only, unless you find a way 
to use EOT on other platforms. It'd also most probably require some changes 
in VCL's font handling, as I couldn't get the activated font listed among 
available fonts (which is what otherwise the current reading of embedded 
fonts does, it adds the new font temporarily in whichever way the underlying 
font system supports and then just uses it normally as if it was a system 
font).

 There's a class EmbeddedFontsHelper in VCL that I created for handling 
embedded fonts, that should be the place to start if you want to give 
implementing this a try.

-- 
 Lubos Lunak
 l.lunak at suse.cz
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