Bug 262750 – [ Sonoma arm64 ] css3/filters/effect-blur-hw.html is a consistent failure

• Component: New Bugs
• Status: RESOLVED FIXED

[Karl Rackler]

Description:
css3/filters/effect-blur-hw.html

Is a constant failure on macOS ToT and since Sonoma bring-up.
The expected effect blur has a blurred border that appears missing on the actual images 2, 3, and 4.

History:
https://results.webkit.org/?suite=layout-tests&test=css3%2Ffilters%2Feffect-blur-hw.html&version_name=Sonoma&architecture=arm64

Diff:
0.26% image difference.
*Diff images attached*
https://build.webkit.org/results/Apple-Sonoma-Debug-AppleSilicon-WK2-Tests/268933@main%20(102)/css3/filters/effect-blur-hw-diffs.html

[Radar WebKit Bug Importer]

<rdar://problem/116551869>

[Karl Rackler]

Created attachment 468084 [details]
effect-blur-hw-diff

[Karl Rackler]

Created attachment 468085 [details]
effect-blur-hw-actual

[Karl Rackler]

Created attachment 468086 [details]
effect-blur-hw-expected

[EWS]

Test gardening commit 268956@main (b5334a81ce49): <https://commits.webkit.org/268956@main>

Reviewed commits have been landed. Closing PR #18735 and removing active labels.

[Simon Fraser (smfr)]

Need some more tolerance.

[Said Abou-Hallawa]

I do not think this is a regression. The test needs more tolerance mainly because the last image was clipped in the expected page. Its filter has a GaussianBlur effect with std = 10. The height of the target element is 90 pixels so the filter element has outsets of 10% of the target element. So the top and bottom outset are both equal to 9 pixels. This outset is not enough for this filter. So the fix is to increase the dimension of the filter by 20% instead.

[Said Abou-Hallawa]

Pull request: https://github.com/WebKit/WebKit/pull/18870

[EWS]

Committed 269152@main (485231878ea3): <https://commits.webkit.org/269152@main>

Reviewed commits have been landed. Closing PR #18870 and removing active labels.