Bug 279105

Summary:

REGRESSION(265569@main): SVG paths can get clipped at tile boundaries

Product:

WebKit

Reporter:

Santosh <exendahal>

Component:

SVG

Assignee:

Said Abou-Hallawa <sabouhallawa>

Status:

RESOLVED FIXED

Severity:

Major

CC:

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

Priority:

Keywords:

InRadar

Version:

Safari Technology Preview

Hardware:

iPhone / iPad

OS:

iOS 18

See Also:

https://bugs.webkit.org/show_bug.cgi?id=277624
https://bugs.webkit.org/show_bug.cgi?id=255898
https://bugs.webkit.org/show_bug.cgi?id=263351
https://bugs.webkit.org/show_bug.cgi?id=283127

Attachments:

Description	Flags
Graph Sample	none
Image preview on iPad mini 6 running ios 18 beta	none
Simple SVG using the path tested on iPad mini 6 running ios 18 beta	none
Simple SVG preview on iPad mini 6 running ios 18 beta	none
rendering on Safari on iPad Pro with a recent version of iOS18	none

Santosh

Reported 2024-09-03 21:36:07 PDT

Created attachment 472433 [details] Graph Sample I have an SVG file that primarily consists of paths and lines, used to render graphs within a Cordova application. After updating to the latest iOS 18 beta, I noticed that the parabolic graphs drawn using paths are not rendering correctly—they appear broken, especially at the ends. To further investigate, I transferred an HTML file containing the SVG elements to an iPad running iOS 18 beta 7 and opened it using the Files app. The issue persists, with the SVG paths appearing broken. If you zoom in on the components slightly, the problem becomes even more noticeable. The issue seems isolated to the latest iOS 18 beta. I've attached an image preview of the broken SVG on the iPad running iOS 18 beta, as well as the HTML file for reference.

Attachments
Graph Sample (20.02 KB, text/html) 2024-09-03 21:36 PDT, Santosh	no flags	Details
Image preview on iPad mini 6 running ios 18 beta (177.80 KB, image/png) 2024-09-03 21:37 PDT, Santosh	no flags	Details
Simple SVG using the path tested on iPad mini 6 running ios 18 beta (4.06 KB, text/html) 2024-09-04 02:42 PDT, Santosh	no flags	Details
Simple SVG preview on iPad mini 6 running ios 18 beta (219.97 KB, image/jpeg) 2024-09-04 02:42 PDT, Santosh	no flags	Details
rendering on Safari on iPad Pro with a recent version of iOS18 (420.38 KB, image/png) 2024-09-13 08:15 PDT, Karl Dubost	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Santosh

Comment 1 2024-09-03 21:37:25 PDT

Created attachment 472434 [details] Image preview on iPad mini 6 running ios 18 beta

Santosh

Comment 2 2024-09-04 02:42:13 PDT

Created attachment 472444 [details] Simple SVG using the path tested on iPad mini 6 running ios 18 beta

Santosh

Comment 3 2024-09-04 02:42:44 PDT

Created attachment 472445 [details] Simple SVG preview on iPad mini 6 running ios 18 beta

Radar WebKit Bug Importer

Comment 4 2024-09-04 09:51:22 PDT

<rdar://problem/135280080>

Karl Dubost

Comment 5 2024-09-13 08:15:17 PDT

Created attachment 472546 [details] rendering on Safari on iPad Pro with a recent version of iOS18 I haven't tried on iPad Mini yet. But on iPad Pro it gets the right thing.

Karl Dubost

Comment 6 2024-09-13 08:16:33 PDT

ah maybe not. In the center, some lines are cut indeed.

Santosh

Comment 7 2024-09-17 08:08:35 PDT

Is there a plan in place to address this fix?

Simon Fraser (smfr)

Comment 8 2024-10-11 14:09:32 PDT

My guess is that this is caused by our "path intersects dirty rect" using a fast bounding box, not an accurate bounding box, similar to bug 277624.

Said Abou-Hallawa

Comment 9 2024-11-12 12:47:35 PST

This is a regression of 265569@main (bug 255898). 269500@main (bug 263351) just uncovered this regression.

Said Abou-Hallawa

Comment 10 2024-11-12 13:13:37 PST

Pull request: https://github.com/WebKit/WebKit/pull/36550

EWS

Comment 11 2024-11-13 10:59:12 PST

Committed 286550@main (5eadead07f65): <https://commits.webkit.org/286550@main> Reviewed commits have been landed. Closing PR #36550 and removing active labels.

EWS

Comment 12 2024-12-11 17:22:40 PST

Committed 283286.588@safari-7620-branch (bfdd18f4ba23): <https://commits.webkit.org/283286.588@safari-7620-branch> Reviewed commits have been landed. Closing PR #2401 and removing active labels.

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