Bug 260224

Summary:	3D transforms with scaleZ(0) don't get rendered, even when combined with other transforms using preserve-3d
Product:	WebKit	Reporter:	Matt Woodrow <mattwoodrow>
Component:	Layout and Rendering	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	bfulgham, simon.fraser, webkit-bug-importer, zalan
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Matt Woodrow 2023-08-15 15:13:28 PDT

We only want to cull layers when the final transformation matrix (including all preserve-3d ancestors) has a z scale component of 0, not when any individual element transform has one.

Affected tests:

compositing/geometry/clipped-out-perspective.html
compositing/overlap-blending/opacity-and-infinity.html
imported/w3c/web-platform-tests/css/css-transforms/perspective-split-by-zero-w.html
imported/w3c/web-platform-tests/css/css-transforms/preserve3d-and-filter-with-perspective.html
imported/w3c/web-platform-tests/css/css-transforms/preserve3d-pseudo-element.html
imported/w3c/web-platform-tests/css/css-transforms/transform-table-009.html
imported/w3c/web-platform-tests/css/css-transforms/transform-table-010.html
imported/w3c/web-platform-tests/css/css-transforms/transform-table-011.html
imported/w3c/web-platform-tests/css/css-transforms/transform3d-preserve3d-011.html

Comment 1 Radar WebKit Bug Importer 2023-08-15 15:13:48 PDT

<rdar://problem/113930861>

Comment 2 EWS 2023-08-17 17:02:52 PDT

Test gardening commit 267019@main (68366e68d39d): <https://commits.webkit.org/267019@main>

Reviewed commits have been landed. Closing PR #16816 and removing active labels.