[poppler] Situation towards 3DPDF support

[Albert Astals Cid]

El dimarts, 11 d’abril de 2017, a les 0:36:58 CEST, Hiroka IHARA va escriure:
> Hello,
> 
> I am a newbie who was working on 3DPDF support back in September.
> In case you still remember, I am sorry that I could not spend time on
> development recently.
> 
> After I submitted the last patch #97868 (I asked for review but you can
> ignore this one because it is obsoleted now), I noticed that the story was
> a bit more complicated than I had thought.
> 
> There are two issues that I need to address related to poppler (and a few
> more on PDF viewer frontends).
> 
> One is the licensing matter.
> I found out that the official documentation of Universal 3D Format is
> slightly outdated, and the Universal 3D Sample Software by Intel seems to
> be somehow acting as the de facto reference.
> 
> Therefore I had to adapt some part (currently a few dozens of lines) of
> Sample Software, which comes in Apache License, into mine, in GPL. I took
> care so that the actual code does not resemble, but the basic algorithm is
> the same.
> 
> Is it allowed to include code adapted from something APL into something GPL?

Seems not really, how copyrighteable is that code you adapted? Is it something 
"hard" or is it "read bit 3 and 4 from this stream"?

> The other is just a question I wanted to ask.
> 3DPDF data is relatively large (up to 10MiB), so I tried to learn from
> existing implementation of Movie, Sound and such media streams.
> 
> What I was curious about is why they extract all the data from Stream into
> tempfiles at first,

Where do we do that?

Cheers,
  Albert

> and read them again in PDF viewer(s) (though I do not
> know about anything other than evince).
> 
> Is it just because some frontend media players are happy that way, or
> because there are performance or some other issues?
> 
> My library will be happy if there is some public GObject to read from Stream
> byte by byte without dumping.
> 
> Lastly, I understand all this stuff is going to take your time, I will stop
> bothering you if you think it is going to be too costly.
> 
> Regards,
> Hiroka