[Webkit-unassigned] [Bug 260224] New: 3D transforms with scaleZ(0) don't get rendered, even when combined with other transforms using preserve-3d

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=260224

            Bug ID: 260224
           Summary: 3D transforms with scaleZ(0) don't get rendered, even
                    when combined with other transforms using preserve-3d
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mattwoodrow at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

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

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