[Okular-devel] Regarding okular generators

[Jaydeep Solanki]

On Sun, Dec 30, 2012 at 12:50 AM, Albert Astals Cid <aacid at kde.org> wrote:

> El Diumenge, 30 de desembre de 2012, a les 00:30:41, Jaydeep Solanki va
> escriure:
> > I'm aware about Textpage algorithms that regardless of the generator,
> makes
> > text selection work properly in column layout.
> > I'm not asking it for okular, I'm asking for personal use, as I was
> trying
> > out Poppler, I made a small app that currently can open pdf files, while
> I
> > was working on the text selection in column layout, I thought that if all
> > the libs generate text in the correct order then there is no need for
> > coding the algorithm to arrange text. In future I'm planning to add
> support
> > for other formats, so I need to know if the algorithm is needed.
>
> The thing is, why write the column sorting algorithm in each and every of
> the
> libraries if you can have it just in one place?
>
>

yes you are absolutely correct, but I was thinking to omit the algorithm
completely. Because if all the libs generate text in proper order then that
can be used for helping the selection, instead of an algorithm.
I have found that OCRopus is used in Okular, I didn't confirm, but found it
somewhere written on internet. (correct me if I'm wrong).
OCRopus uses image processing which uses a large amount of computation
resources.
So the core reason to omit the algorithm is to save large computation.


> Cheers,
>   Albert
>
> >
> > Jaydeep
> >
> > On Sat, Dec 29, 2012 at 11:22 PM, Albert Astals Cid <aacid at kde.org>
> wrote:
> > > El Dissabte, 29 de desembre de 2012, a les 22:56:12, Jaydeep Solanki va
> > >
> > > escriure:
> > > > As you might be knowing that Poppler::Page::textList() generates
> text in
> > > > the correct order (i.e. left to right). Now poppler not only
> generates
> > > > it
> > > > in the correct order but it also considers the layout, for example
> in a
> > >
> > > two
> > >
> > > > column document, it follows the column layout while indexing the
> text.
> > > > [image: Inline image 2]
> > > >
> > > > just of example consider the image above, see the selection, poppler
> > > > doesn't generate textList() in that order, it generates the
> textList()
> > > > as
> > > > shown in the below image,
> > > >
> > > > [image: Inline image 3]
> > > > So my question is do all the libraries that the generators of okular
> > > > use,
> > > > generate text in the proper order considering the layout ?
> > >
> > > That doesn't matter, Textpage algorithms "should" correctly arrange
> text
> > > in
> > > columns (as correctly as the algorithm in there works).
> > >
> > > Have you found any particular problem?
> > >
> > > Albert
> > > _______________________________________________
> > > Okular-devel mailing list
> > > Okular-devel at kde.org
> > > https://mail.kde.org/mailman/listinfo/okular-devel
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