Re: Another possible gb.poppler bug?

[gbWilly <gbWilly@xxxxxxxxxxxxxx>]

On Tuesday, December 2nd, 2025 at 18:46, Lee <t.lee.davidson@xxxxxxxxx> wrote:

> On 12/2/25 12:23 PM, gbWilly wrote:
> 
> > > You could determine if the document has embedded thumbnails, when it is loaded, by testing if a thumbnail for the first page is
> > > found.
> 
> > The application AND example I posted already do that
> 
> 
> No, they don't. Your application tests EACH AND EVERY page in succession and renders a thumbnail if needed. I suggested testing
> only the first page to determine if the entire document has embedded thumbnails


You are absolutely right, how did I overlook that. Thanks.


> > > If thumbnails are not embedded and self-rendering is needed, you could:
> > > 
> > > Load up a generic, lightweight thumbnail for each page and then use IconView's Draw event to render an appropriate thumbnail, or
> > > Use Tasks to generate the thumbnails.
> 
> > If I render them at 4 dpi it still takes a while.
> 
> 
> By "them" do you mean render thumbnails for all pages? That is not what I suggested. My suggestion was to load up a generic,
> lightweight "placeholder" thumbnail; a thumbnail from a file in your project such as, perhaps, the Gambas logo. And then only
> when the "real" thumbnail is needed, indicated by a triggering of the IconView Draw event, render the thumbnail from the page.
> You would, of course, need to determine if the Draw event is due to the initial loading of the generic thumbnails. A boolean
> semaphore would work for that.

Ah, ok, I misunderstood.

But still going back to the other pdfviewer. My Atril when clicking open shows file and ALL thumbs before I end saying one (counting out loud).
That all thumbs are loaded I can see at the slide bar.
My gambas pdfviewer when opening, it now shows pdf straight away but I can still count to 3 before all is rendered. I do believe that the rendering in gambas somehow is a lot slower that whatever Atril is written in or uses, as I do not believe they are rendering them while already opened, but during opening as well, just very fast in an even higher quality as I render them in..

I want to try a really big file on a slow system, so you can noticeably see the difference. I have got some pi's and old laptop. I'm not done with this that is for sure.
It's a lovely challenge, as the British would say...

gbWilly