RESOLVED FIXED 277988
[view-transitions] Toggling a skew transform causes a position shift 
https://bugs.webkit.org/show_bug.cgi?id=277988
Summary [view-transitions] Toggling a skew transform causes a position shift
Tim Nguyen (:ntim)
Reported 2024-08-12 16:37:40 PDT
Created attachment 472126 [details] Reduced testcase See testcase
Attachments
Reduced testcase (764 bytes, text/html)
2024-08-12 16:37 PDT, Tim Nguyen (:ntim) 		no flags
Details
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Radar WebKit Bug Importer
Comment 1 2024-08-12 16:37:54 PDT
<rdar://problem/133721607>
Tim Nguyen (:ntim)
Comment 2 2024-08-12 16:42:50 PDT
Also repros with skewY()
Matt Woodrow
Comment 3 2024-08-30 01:03:26 PDT
This is a transform interpolation issue. Logging in TransformationMatrix::blend gives the following: Blending: [1.00 0.36 0.00 0.00] [0.00 1.00 0.00 0.00] [0.00 0.00 1.00 0.00] [200.00 200.00 0.00 1.00] to [1.00 0.00 0.00 0.00] [0.00 1.00 0.00 0.00] [0.00 0.00 1.00 0.00] [200.00 200.00 0.00 1.00] at 0.00 blend2 Result: [1.00 0.36 0.00 0.00] [-0.00 1.00 0.00 0.00] [0.00 0.00 1.00 0.00] [240.72 207.11 0.00 1.00] This is specific to the blend2 path, and can be avoided by using 3d transform interpolation (but not easily by authors). Bug 235806 does fix this, but it also changes interpolation in ways that might not match our current rendering.
Matt Woodrow
Comment 4 2024-08-30 18:20:32 PDT
Pull request: https://github.com/WebKit/WebKit/pull/32975
EWS
Comment 5 2024-09-02 16:30:12 PDT
Committed 283072@main (6d78055bf6ab): <https://commits.webkit.org/283072@main> Reviewed commits have been landed. Closing PR #32975 and removing active labels.
Matt Woodrow
Comment 6 2024-09-02 18:01:10 PDT
Submitted web-platform-tests pull request: https://github.com/web-platform-tests/wpt/pull/47932
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