On larger PDFs evince will zoom in even less.

can you attach a simple reproducer ?

Attaching my family tree is a step too far.
I'll see how to generate an A0 in a different way.

Simply create an empty A0 or larger sized (write doesn't know A0?) document and export as PDF.
Mine is 60"x25".
Open in evince. Set zoom lever to anything over 100%.
See resulting zoom level.

Created attachment 1285191 [details]
reproducer pdf

Workaround described at: https://bugs.launchpad.net/ubuntu/+source/evince/+bug/721217/comments/4

Test your settings in Evince:

$ gsettings get org.gnome.Evince page-cache-size

Set a new (bigger) value instead:

$ gsettings set org.gnome.Evince page-cache-size 100

This could be more automagic?

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We have a workaround but no real solution.
(config option?)

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In Fedora 32 the viewings problems are still present.
We did:
$ gsettings set org.gnome.Evince page-cache-size 8192

Yet the zoom goes only to 5.4% with no ability to view (part of ) the PDF from a `closer` range.
PDF has grown to 9000 × 7000 mm.
Simply the output of gramps and a 3 millennia family tree.
Why can't I view the pdf at a readable zoom level?
I.e.: what is the issue?

Hi,

I'm sorry for the delay.
I had a look at this and you are right that setting the cache to 8 GiB does not succeed. It is because of wrong type passed to function ev_view_set_page_cache_size(). I've proposed a merge request to uptream of evince which fixes this (https://gitlab.gnome.org/GNOME/evince/-/merge_requests/322). I'll fix this in Fedora 33 and newer in the meantime.

Please do.
I can understand these PDFs I have are uncommon but if evince can scale it is more allround functional.

FEDORA-2021-6aeb21e87b has been submitted as an update to Fedora 33. https://bodhi.fedoraproject.org/updates/FEDORA-2021-6aeb21e87b

FEDORA-2021-9a81b3b29d has been submitted as an update to Fedora 34. https://bodhi.fedoraproject.org/updates/FEDORA-2021-9a81b3b29d

Thanks for the builds.
After installing I did:

gsettings set org.gnome.Evince page-cache-size 8192

And tested. I see a changed zoom percentage when evince starts up with the problem PDF but do not see any part of the pdf appear, not even scrollbars or anything.
Then I changed to:

gsettings set org.gnome.Evince page-cache-size 16384

Same behaviour, different default zoom but no pdf to be seen.
Smaller pdfs work as expected.

FEDORA-2021-6aeb21e87b has been pushed to the Fedora 33 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --advisory=FEDORA-2021-6aeb21e87b`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2021-6aeb21e87b

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

FEDORA-2021-9a81b3b29d has been pushed to the Fedora 34 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --advisory=FEDORA-2021-9a81b3b29d`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2021-9a81b3b29d

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

For the PDF in question I am searching for the right size so that I can print/view the PDF at 100% (i.e.: 1:1).
The Gramps 'family lines report' output size appears to scale with the paper size.
Currently I have a PDF of 9921x7087 dots.
I can  open this PDF in evince, set for e.g. 'fit width'.
A zoomed out version of (part of) the PDF appears.
Then we start zooming in using ctrl-+.
Until 59.5% things work as to be expected.
When we press ctrl-+ again we go to 71.4% and the view goes grey.
The evince menu bar disappears.
We see parts of the items on the desktop at the top.
There is no response to ctrl-+.
There is repsonse to pressing ctrl-- a few times: the pdf reappears after a short while.

FEDORA-2021-6aeb21e87b has been pushed to the Fedora 33 stable repository.
If problem still persists, please make note of it in this bug report.

How can this bug be closed when I can not zoom to 100%?

The issue here is that the page is rendered to a single image. Size of the image is limited by used backend of cairo. I can not fix this as it would need substantial changes to how evince works (to render only parts of the page as needed).
I can try to fix the issue of corrupted UI at least.

What are the cairo limitations in pixel dimensions?

The limitation is probably 32767 x 32767 for the used backend.

I've filed another merge request which fixes the issue with corrupt UI:

https://gitlab.gnome.org/GNOME/evince/-/merge_requests/329

The best solution to this would be implementation of the partial rendering. There is an upstream issue for this here:

https://gitlab.gnome.org/GNOME/evince/-/issues/175

I'll file another update for the corrupt UI but will close this bug with resolution UPSTREAM then.

FEDORA-2021-9a81b3b29d has been pushed to the Fedora 34 stable repository.
If problem still persists, please make note of it in this bug report.