Bug 231495

Summary:

On iOS 15, when the canvas font is set to -apple-system, calling fillText with Chinese characters would cause the whole canvas area to blank.

Product:

WebKit

Reporter:

luonan.666

Component:

Canvas

Assignee:

Nobody <webkit-unassigned>

Status:

RESOLVED DUPLICATE

Severity:

Blocker

CC:

dino, mmaxfield, simon.fraser, wenson_hsieh

Priority:

Keywords:

HTML5

Version:

Safari 15

Hardware:

iPhone / iPad

OS:

Unspecified

Attachments:

Description	Flags
render blank demo	none

luonan.666

Reported 2021-10-10 20:30:52 PDT

Created attachment 440751 [details] render blank demo On iOS 15, when the canvas font is set to -apple-system, calling fillText with Chinese characters would cause the whole canvas area to blank. first, set ctx.font = '28px -apple-system'; and then, draw some chinese, ctx.fillText('你好', 10, 50); then the whole canvas area becomes blank. but English letters could render correctly. Just change the font-family to 'Arial', everything works fine.

Attachments
render blank demo (511 bytes, text/html) 2021-10-10 20:30 PDT, luonan.666	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Alexey Proskuryakov

Comment 1 2021-10-11 09:20:45 PDT

I cannot reproduce this with OS 15.1 beta. I think that it was a known issue, but cannot find the bug to dupe to.

Wenson Hsieh

Comment 2 2021-10-11 09:42:08 PDT

Likely, 230187. *** This bug has been marked as a duplicate of bug 230187 ***

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