[Okular-devel] how to get images from pdf files?

[Albert Astals Cid]

El Dijous, 7 de març de 2013, a les 14:50:18, Haidong Tang va escriure:
> Albert,
> 
> Thanks a lot for clarifying! So is there any function that I can know the
> positions of intrinsic images in a pdf? 

As I already said in the previous email we don't have any API for that in 
Okular.

> I just want to find a way to take out those images. Do you have any 
suggestions?

Implement the feature in poppler-qt and then implement the feature in Okular

> Also, what is an OKULAR_OBSERVER_ID? I don't quite understand the mechanism
> behind it. I used 6 in my case and it works fine but when I'm using 77 it
> doesn't work at all. What number am I supposed to use?

Use okular master and you won't need to care about that since i recently 
killed the observer id concept.

Cheers,
  Albert

> 
> > Message: 4
> > Date: Thu, 07 Mar 2013 11:47:19 +0100
> > From: Albert Astals Cid <aacid at kde.org>
> > To: Okular development <okular-devel at kde.org>
> > Subject: Re: [Okular-devel] how to get images from pdf files?
> > Message-ID: <9667157.6NtSr88zM4 at xps>
> > Content-Type: text/plain; charset="iso-8859-1"
> > 
> > El Dijous, 7 de mar? de 2013, a les 00:12:10, Haidong Tang va escriure:
> > > Hi,
> > 
> > Hi
> > 
> > > I'm testing some functionalities on Okular and currently I'm working on
> > > getting images from a pdf files. I tried to use requestPixmaps( const
> > > QLinkedList<PixmapRequest*> &requests ) in the class Document to request
> > > image asynchronously and then use _o_nearestPixmap to get the images
> > > when
> > > they are ready. However, the images I got by using this method are not
> > > really what I want. This method may give me an image of the whole page,
> > 
> > but
> > 
> > > actually I'm only interested in those intrinsic images embedded in a
> > 
> > page,
> > 
> > > not a whole page converted into a image. Am I using the wrong function
> > 
> > for
> > 
> > > this task? Are there other more proper functions for my task? Thanks!
> > 
> > There's no method that does what you want in the Okular API. You're
> > welcome to
> > draft the API for it if you need it and think the backends can implement
> > it.
> > 
> > Cheers,
> > 
> >   Albert