Re: Another possible gb.poppler bug?

[Claus Dietrich <claus.dietrich@xxxxxxxxxx>]

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.

Best regards, Claus