Bug 252133

Summary:

Using LinearGradient fill on <path> shows line artefact above element bounding box

Product:

WebKit

Reporter:

Alexey <x-alex-95+bugzilla>

Component:

SVG

Assignee:

Nobody <webkit-unassigned>

Status:

RESOLVED DUPLICATE

Severity:

Normal

CC:

ap, sabouhallawa, simon.fraser, webkit-bug-importer, zimmermann

Priority:

Keywords:

InRadar

Version:

Safari 16

Hardware:

iPhone / iPad

OS:

Unspecified

Attachments:

Description	Flags
Example screenshot 1	none
Example screenshot 2	none
Example screenshot 3: <img> embed	none
Example file	none

Alexey

Reported 2023-02-12 07:41:00 PST

Created attachment 464959 [details] Example screenshot 1 <path> elements which are using LinearGradient as fill occasionally display line artefacts at the top of their bounding box. The issue occurs when scaling the svg, either when viewed on its own through zoom, or when using an <img> element on a webpage. The issue seems to be triggered on certain scaling levels, which are different for each object: in practice this manifests as lines flickering as you zoom in. To the best of my knowledge and testing, desktop Safari is unaffected and does not reproduce this behavior. Attached are several example screenshots as well as a sample <svg>.

Attachments
Example screenshot 1 (1.35 MB, image/png) 2023-02-12 07:41 PST, Alexey	no flags	Details
Example screenshot 2 (1002.64 KB, image/png) 2023-02-12 07:42 PST, Alexey	no flags	Details
Example screenshot 3: <img> embed (1.14 MB, image/png) 2023-02-12 07:42 PST, Alexey	no flags	Details
Example file (22.41 KB, image/svg+xml) 2023-02-12 07:43 PST, Alexey	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Alexey

Comment 1 2023-02-12 07:42:06 PST

Created attachment 464960 [details] Example screenshot 2

Alexey

Comment 2 2023-02-12 07:42:27 PST

Created attachment 464961 [details] Example screenshot 3: <img> embed

Alexey

Comment 3 2023-02-12 07:43:16 PST

Created attachment 464962 [details] Example file

Alexey Proskuryakov

Comment 4 2023-02-13 10:05:04 PST

We had a number of reports with similar symptoms, which are believed to be an issue below WebKit (cf. bug 248003, bug 245652). CC'ing Simon to confirm.

Radar WebKit Bug Importer

Comment 5 2023-02-19 07:41:16 PST

<rdar://problem/105647929>

Simon Fraser (smfr)

Comment 6 2023-02-20 11:02:24 PST

*** This bug has been marked as a duplicate of bug 248003 ***

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