Bug 198454

Summary:

Optimize for negative z children on the root

Product:

WebKit

Reporter:

Simon Fraser (smfr) <simon.fraser>

Component:

Compositing

Assignee:

Simon Fraser (smfr) <simon.fraser>

Status:

NEW

Severity:

Normal

CC:

koivisto, simon.fraser, zalan

Priority:

Version:

WebKit Nightly Build

Hardware:

Unspecified

OS:

Unspecified

Attachments:

Description	Flags
Testcase	none

Simon Fraser (smfr)

Reported 2019-06-01 10:55:22 PDT

Created attachment 371114 [details] Testcase It's pretty common to have negative z-index children in the root stacking context. Currently, we'll pop in to adding a foreground layer, which will become tiled and double our tiled backing store memory use. We could, in some cases, use the page tiles for the foreground, and just have a solid color background behind the negative z-index child.

Attachments
Testcase (1.69 KB, text/html) 2019-06-01 10:55 PDT, Simon Fraser (smfr)	no flags	Details
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