Bug 230636

Summary:

border-radius clipping stops working when using mix-blend-mode with composted children

Product:

WebKit

Reporter:

Simon Fraser (smfr) <simon.fraser>

Component:

Compositing

Assignee:

Nobody <webkit-unassigned>

Status:

RESOLVED DUPLICATE

Severity:

Normal

CC:

graouts, simon.fraser, webkit-bug-importer

Priority:

Keywords:

InRadar

Version:

Safari Technology Preview

Hardware:

Unspecified

OS:

Unspecified

See Also:

https://bugs.webkit.org/show_bug.cgi?id=140535
https://bugs.webkit.org/show_bug.cgi?id=67950

Attachments:

Description	Flags
Test case	none

Description Simon Fraser (smfr) 2021-09-22 13:19:54 PDT

Created attachment 438969 [details]
Test case

Bug 140535 can be triggered even when the element with border-radius is a stacking context, if one of the children has mix-blend-mode.

Comment 1 Simon Fraser (smfr) 2021-09-22 13:20:16 PDT

<rdar://83414168>

Comment 2 Simon Fraser (smfr) 2021-09-22 13:22:21 PDT

This happens because isolatesCompositedBlending() changes the behavior of composited clipping from using a single clipping layer for descendants (which knows how to do border-radius clipping) to using an "ancestor clip layer" on each descendant, which does not. See RenderLayerCompositor::clipsCompositingDescendants().

Comment 3 Simon Fraser (smfr) 2022-08-31 14:40:28 PDT


*** This bug has been marked as a duplicate of bug 68196 ***