[Webkit-unassigned] [Bug 255368] New: Bring slerp interpolation in line with spec

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=255368

            Bug ID: 255368
           Summary: Bring slerp interpolation in line with spec
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ahmad.saleem792 at gmail.com
                CC: dino at apple.com, graouts at apple.com,
                    mattwoodrow at apple.com

Hi Team,

Based on discussion with @graouts on Slack 1-1, I am creating this bug report about potential Blink commit merge:

Commit - https://chromium.googlesource.com/chromium/blink/+/f550639338aaaa3abf07b88997609a396fb5cfad

Spec Discussion Link - http://lists.w3.org/Archives/Public/www-style/2013May/0131.html

``` Commit Message ```

The slerp function to interpolate between two quaternions (when blending two
decomposed matrices) does not match the spec. Although it may be desirable for
the interpolation to occur along the shortest path (as discussed in issue
14983004 and http://lists.w3.org/Archives/Public/www-style/2013May/0131.html),
the spec has not been changed as requested there. So this updates the WebKit
implementation to be in line with the spec.

______________________

Just wanted to raise for any input and also it is possible to do 1-1 merge, I did it in local testing branch few weeks back.

Thanks!

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