[poppler] General doubts regarding annotations and its poppler support for GSoC project

[Oliver Sander]

Hi Dileep,

I think I can answer most of your questions.

> 1. What does Okular use - the core poppler or poppler Qt5 interface library?

Okular uses the poppler Qt5 interface library exclusively.  That library in turn
calls core poppler, which does most of the real work.

> 
> 2. There is partial FreeText (TypeWriter) annotation support in poppler but not in poppler-qt5. With this information, should Okular have FreeText annotation support too?

Most likely you will need to extend poppler-qt5 to make the FreeText support
of poppler core available to users of poppler-qt5 (such as Okular).

> 
> 3. What is the role of source files in i) okular/generator/poppler and also in ii) okular/core directories? Hence how does Okular use poppler?

Remember that Okular shows all kinds of documents, not just pdf.
okular/core contains code that is independent of the file format,
whereas okular/generator/poppler contains the pdf-specific part.


> 
> 4.  How is an annotation implemented in poppler? 

Somebody else will have to answer this question.

> Does poppler provide any backend or UI for the annotation?

There are no UIs at all in poppler.

> 
> 5. If annotations are implemented in poppler and Okular uses it, so why does Okular also contain "annotation" named source files in okular/core, okular/generator/poppler and okular/ui directories?

Please somebody else answer this.

Regards,
Oliver

> 
> Please clear my doubts as soon as possible so that I can write my proposal very soon.
> 
> Thanks and Regards
> Dileep
> 
> 
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