[Webkit-unassigned] [Bug 54617] REGRESSION: transform:matrix() -based rotation sometimes doesn’t reverse correctly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=54617





--- Comment #1 from Chris Marrin <cmarrin at apple.com>  2011-02-17 11:06:51 PST ---
(In reply to comment #0)
> in WebKit Version 5.0.3 (6533.19.4, r78685) only matrix-based rotations sometimes don’t reverse correctly when triggering stops (e.g. trigger transition several times while transitioning), leading to animation to incorrect endpoint then instant snap to actual endpoint. This problem is not visible in Safari Version 5.0.3 (6533.19.4) or Chrome 9.0.597.102 — regression?
> Linked example works as expected in Firefox 4 beta and Opera 11.01
> http://oli.jp/bugs/webkit/transform-matrix-rotate.html

At first you say 5.0.3 shows the problem, but then you say it doesn't. Where are you seeing results that are different?

The problem is that we have to decompose the matrix to extract the rotations and that process can lose sign. I don't see a way around this. But I am concerned that it behaves differently on different browsers. Let me know if that is the case

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