Zooming in High Res PDFs blurs text and making them unreadable

[CodingFabian]

When zooming in on some large drawing/floorplan/map pdfs, the zoomed text becomes unreadable.
It looks like it is rendered to the canvas only once and then upscaled.
As an example see this map:
https://public.centerdevice.de/8ddc0fe8-ecc6-456a-bdac-4e5f58b22f35

This is rendered at 400% using acrobat:

and this is how it looks in pdfjs:

This is especially a problem on large maps which require much zooming to be actually readable. if the initial drawing was too small the zooming doesnt help and only enlarges garbage

[yurydelendik]

We blocked growing canvas size to some limit (see #4834) for performance and memory reasons. It is blocked by tiling of the page into smaller canvases.

[CodingFabian]

i have assumed that this is related.

[tadashi-koya]

Deare team.

I am also troubled by the same event.

I attempt #4834 case about maxCanvasPixels tunning but Nothing change.

Is there any tips/workaround for this problem?

regards.

[timvandermeij]

The only good solution is the one that @yurydelendik provided above, but someone needs to implement that, so there is no solution at the moment.

[tadashi-koya]

Thank you for your advice.

I understand that there is no implementation now.

regards.

[yurydelendik]

Blocked by #6419

[Snuffleupagus]

Duplicate of #6419