Re: Another possible gb.poppler bug?

[Gianluigi <gradobag@xxxxxxxxxxx>]

Il 02/12/25 17:26, Claus Dietrich ha scritto:
> Am 02.12.25 um 12:41 schrieb Gianluigi:
> > You may not remember, but Hans also involved me in the PDF editor 
> > project.
> > Did you see the video?
> > Have you tried opening a file of more than 1,000 pages with the PDF- 
> > Reader project?
> > Does it seem to work like Atril or similar programs?
> > Also, PDF-Rider doesn't seem to work, it seems to freeze, and in some 
> > cases (out of memory) it doesn't even close the Open window.
> > Then it opens, but then...
>
> Hi Gianluigi
>
> I have seen the video and it didn't surprise me.
>
> It goes without saying that rendering takes time and if there are no 
> thumbnails and the number of pages is high then it takes plenty of time. 
> What makes you think that the rendering is the brake in a Gambas PDF 
> viewer? There are other controls that eat a lot of processing time as 
> well. Further you can hardly compare mature PDF viewers with a Gambas 
> PDF viewer without considering the differences in the programming 
> languages.
>
> Have you ever loaded a huge PDF with Okular? Sometimes it takes an 
> eternity to display it.
>
> This thread is purely based on the assumption, that most PDFs contain 
> thumbnails and that they are displayed by the standard PDF viewers. No 
> proof has been provided yet, that this assumption is correct.
>
> I am assuming the opposite! Almost all PDFs I ever came across didn't 
> have embedded thumbnails.
>
> I came to this conclusion because I tested it. This required a side trip 
> back into the Windows world and to Adobe Acrobat. I took a PDF generated 
> with LibreOffice (having no thumbnails) and added thumbnails to it with 
> Adobe Acrobat. Now I had two versions of the same PDF - one with and one 
> without thumbnails. When I loaded the self-made PDF with thumbnails in 
> my Gambas PDF Viewer the embedded thumbnails were found and displayed. 
> As expected the loading was faster and I noted that the embedded 
> thumbnails look totally different than the self rendered ones - which 
> was no surprise.
>
> Have a look by yourself. I loaded both PDFs up into my cloud: https:// 
> magentacloud.de/s/4TJeHaqcgQbNKri
>
> and included screenshots of my Gambas PDF viewer, so that you can see 
> the difference (with/without thumbnails) yourself.
>
> Is there a way to provide me with the 1000-pages PDF shown in the video? 
> This would allow me to compare the solution of gbWilly with my own and 
> to search for possible brakes in our apps.
Dear Claus,

Excuse me, but I'm not criticizing anything or anyone.
I'm just showing the state of the art.

Benoit has said repeatedly that if you want to emulate DE readers, you 
need to open the PDF file, for example, as in the first gbWilly test 
(actually test number two), the one with only the indexes, and then 
gradually display the thumbnails as needed.
I asked him if he could add a function like GridView_Data (assuming it 
isn't already there), or if he could give me a hint on how to do it.
Unfortunately, my request was ignored.

I believe you when you say you've done all the necessary tests.
Unfortunately, I don't have the time to do any testing right now.
Just a clarification: there's a difference between rendering and 
refreshing, as Fabien Bodard pointed out to me.

I don't remember where it was, but I downloaded the 1,059-page PDF file 
from https://www.asus.com/support/download-center/
I downloaded it by searching for motherboards (a memory from when I 
built my PC).

Best regards
Gianluigi