[Webkit-unassigned] [Bug 277988] [view-transitions] Toggling a skew transform causes a position shift

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=277988

Matt Woodrow <mattwoodrow at apple.com> changed:

           What    |Removed                     |Added
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                 CC|                            |mattwoodrow at apple.com

--- Comment #3 from Matt Woodrow <mattwoodrow at apple.com> ---
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.

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