1898170 - JavaScript regression in image/buffer handling

Status: NEW

(Core :: Graphics: WebRender, defect, P3)

Description

[Martin Husemann]

The https://github.com/blueimp/JavaScript-Load-Image repository provides a module that handles scaling/rotation based on exif data on image loading in a very convenient way. It includes a self test page - just clone/checkout the repo and open test/index.html.

This self test works fine on other current browsers, but fails one test (EXIF Orientation 6, step 7) in Firefox 126.

I did not extensively test older version, but the test works on Firefox 110.

Comment 1

[Jan de Mooij [:jandem]]

This works with Enhanced Tracking Protection disabled.

Comment 2

[Jan de Mooij [:jandem]]

Test page: https://blueimp.github.io/JavaScript-Load-Image/test/

Comment 3

[Jan de Mooij [:jandem]]

I think this works with Standard protection but breaks with Strict.

Comment 4

[Alice0775 White]

I can reproduce the issue on Nightly128.0a1 Windows11 with clean new profile.
And it works if setting gfx.webrender.software to true (required restart browser).

So, I think this is WebRender bug rather than the ETP bug.

Comment 5

[Tim Huang[:timhuang]]

The page is broken because Firefox enables the fingerprinting protection in ETP strict mode. I think it's the canvas randomization which causes the issue.

Comment 6

[Martin Husemann]

Disabling ETP does not fix the test for me (Windows, FF 126).
Switching gfx.webrender.software to true (as suggested in #4) makes it work for me.

Comment 7

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

This bug has been marked as a regression. Setting status flag for Nightly to affected.

Comment 8

[Daniel Holbert [:dholbert]]

For what it's worth, I can't reproduce on Linux or on Android, but I can reproduce on Windows 11. So this might be Windows-specific? (This is currently classified as All/All, but that might be overbroad.) (I'm testing with hardware WebRender in all cases.)

(In reply to Martin Husemann from comment #0)

I did not extensively test older version, but the test works on Firefox 110.

Perhaps someone could track down when this regressed --> adding regressionwindow-wanted.

Comment 9

[Alice0775 White]

#1 Regression window, All tests of EXIF Orientation: 6 are fail:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=15953f022d92a0513163feefb61fc53f80c95d54&tochange=c6fe172dd237e2a89a33ec8c61ad91bcdb235bf1

Suspect: Bug 1566316

#2 Regression window, Fixed the previous failures except 7: horizontal flip + 90° rotate right:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=f055b35804d7d6f8a5878f21583284708475cf32&tochange=325e655b6024492c976ba22bf2335ad5d2229036

Bug 1616411 fixes the failures from Bug 1566316, but not this bug 7: horizontal flip + 90° rotate right.

Comment 10

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

Set release status flags based on info from the regressing bug 1566316

Comment 11

[Alice0775 White]

FWIW, Setting gfx.canvas.azure.backends to skia fix the failure on Nightly128.0a1 Windows11.