| 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: | P2 | ||||||
| Version: | WebKit Nightly Build | ||||||
| Hardware: | Unspecified | ||||||
| OS: | Unspecified | ||||||
| Attachments: |
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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.