[Okular-devel] [Bug 181326] avoid white pages as progress indicators -- flickering

[Maciej Pilichowski]

http://bugs.kde.org/show_bug.cgi?id=181326





--- Comment #8 from Maciej Pilichowski <bluedzins wp pl>  2009-01-19 22:35:39 ---
> > I meant, visually adding. Not changing the image itself.
> And again, it changes the image, meant as "what the user sees".
> Imagine some logo popping up in a renderer page, wouldn't this
> surprise the user? "wft? the page changed?".

I didn't see such reaction at all. Not only for kpdf/okular but in general.
Progress indicators are quite common now.

> > You said above that showing white pages is not an option. We are
> > talking about those artificially created objects, not white pages
> > from pdf!
> They are *NOT* articifically created objects, they are *pages* of
> the document! They do have the proper size, the proper objects on
> them (like annotations, form fields, etc)... just they have not
> been rendered yet, or they need to be rendered again.

So my wish is -- do not show them. Show only and only this what is in the
document. Do not show in-between steps. (*)

> The point is: if that would be a so huge problem, wouldn't that be
> solved already since years?

It was, over 20 years ago. The technique is called double buffering, you show
one image, you render the second internally (not showing it), when it is ready,
you show the second one. Ready to see.

And besides, this logic is flawed -- "640KB is enough, who would need personal
computer, etc etc etc." I heard it all.
  So if I follow this logic, we now need some move from Apple, and then
everybody would say "oh, geniuses, how they spotted this?".

> The behaviour model is well tested and working fine. 

Yes, it is well tested flickering is bad for eyes, but you are mistaken, it
does not work fine.

We are talking about health here.

> Again, there is nothing extra. What you see is *your* document.

Wrong. I see white pages, my document has zero white pages. I _WISH_ I would
see _ONLY_ what is in my document. Only.


(*) there is another approach, to show image blurry and then step by step in
more quality. I don't mind this approach, because it does not affect eyes (that
much) as flickering with white pages


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