1661253 - Pdf page white while loading on increased zoom levels

Status: VERIFIED FIXED

(Firefox :: PDF Viewer, defect, P1)

Description

[Cristian Fogel [:cfogel]]

Attachment: Screen Recording 2020-08-26 at 15.31.24.mov

Affected versions

• 80.0, 81.0b2, 82.0a1(2020-08-25)

Affected platforms

• macOS 11.0, Ubuntu 20

Steps to reproduce

1. Launch Firefox;
2. Access this attachment;
3. Zoom in a couple of times;

Expected result

• zoom in/out works without issues;

Actual result

• past a point, zoom-ing in renders the page blank for a couple of seconds;

Regression range

• will check and provide one asap;

Additional notes

• since the content is displayed after some time, the suggested severity is bumped down to S4;
• attached recording with the issue.

Comment 1

[Julien Cristau [:jcristau]]

(In reply to Cristian Fogel, QA [:cfogel] from comment #0)

Regression range

• will check and provide one asap;

Any luck?

Comment 2

[Catalin Sasca, Desktop QA [:csasca]]

This doesn't seem to be a regression as I got way back to builds from 2014 and there, the pdf page was flashing at every zoom in or out on Ubuntu 20.04.

Comment 3

[Vlad Lucaci, Desktop QA (:vlucaci)]

Reproduced it on Win10x64 with 86.0a1(20201216093604) as well

Comment 4

[Marco Castelluccio [:marco]]

We are planning to fix this soon as the performance impact can be high on mobile.

Comment 5

[Sean Feng [:sefeng]]

The Performance Impact Calculator has determined this bug's performance impact to be high. If you'd like to request re-triage, you can reset the Performance Impact flag to "?" or needinfo the triage sheriff.

Platforms: [x] Windows
×3 [x] macOS
×3 [x] Linux
×1 [x] Android
×1.5
Impact on browser: Causes noticeable jank
+5
Impact on site: Causes noticeable jank
+2
Websites affected: Rare
×0.3
[x] Causes severe resource usage
+2
[x] Affects animation smoothness
+1
[x] Able to reproduce locally
×2
[x] Bug affects multiple sites
×2

Comment 6

[Julien Wajsberg [:julienw]]

I must add that when I tried it locally, the browser UI froze and I had to kill it finally. I admit I clicked the + button repeatedly so it might be that this was computing this several times.

Comment 8

[BugBot [:suhaib / :marco/ :calixte]]

The severity field for this bug is set to S3. However, the Performance Impact field flags this bug as having a high impact on the performance.
:calixte, could you consider increasing the severity of this performance-impacting bug? Alternatively, if you think the performance impact is lower than previously assessed, could you request a re-triage from the performance team by setting the Performance Impact flag to ??

For more information, please visit auto_nag documentation.

Comment 9

[Calixte Denizet (:calixte)]

We're currently working on this issue to improve zooming in general and very specifically for the android target, so let's move it to S2.

Comment 10

[Calixte Denizet (:calixte)]

Attachment: pr 15812: Only redraw after zooming is finished (bug 1661253)

Comment 11

[Ardelean Oana, Desktop QA [:oardelean]]

Reproducible with a 2023-01-02 Nightly build on Windows 10.
Verified as fixed on Firefox 110.0b2(build ID: 20230117185909) and Nightly 111.0a1(build ID: 20230118095131) on Windows 10, macOS 12, Ubuntu 22.