Re: Another possible gb.poppler bug?

[gbWilly <gbWilly@xxxxxxxxxxxxxx>]

On Tuesday, December 2nd, 2025 at 12:50, Claus Dietrich <claus.dietrich@xxxxxxxxxx> wrote:

> Am 02.12.25 um 12:16 schrieb gbWilly:
> 
> > The LibreOffice documents exported as pdf, do show thumbs in other pdfviewers, I have to self render them in my pdfviewer.
> 
> 
> LibreOffice never generates thumbnails when exporting documents to PDF
> and how do you know that the standard PDF viewers found embedded
> thumbnails and display them instead of self rending?

I don't, I thought I made that clear, it just SEEMS like they do because of the speed they load and render the thumbnails on the spot.

As Gianluigi points out, if you self render a pdf with 1000 pages, it takes quite a while, might even hang on older systems, where other pdfviewers show thumbnails in a second (I presume also self rendered after all I read). So, in other pdfviewers they are fully rendered during the opening the file.

Now, I can play a bit with when I render, to ensure the document is shown, before starting rendering the thumbs. But during rendering, even a timer object doesn't trigger, as the whole application seems to be caught up in the rendering. So showing the document first, gives some visible comfort to the user, but you can't do shit until the rendering is finished. Fact is that this self rendering is much slower than the self rendering other pdfviewers seem to be able to do. 

> I tested xReader and Okular with a PDF containing embedded thumbnails. I
> generated this document myself with Adobe Acrobat because I couldn't
> find any PDF in the Web with embedded thumbnails. As a result I found
> that the standard PDF readers allways render themselves, possibly
> because embedded low resolution thumbnails look poor.

If they always render themselves, what could well be seeing the quality, they do a visual way faster rendering job than gambas is even able to! What could be causing that is my next question then?

gbWilly