Bug 245658

Summary:	Provide dedicated functions for computation of from and to values for composite animations
Product:	WebKit	Reporter:	Antoine Quint <graouts>
Component:	Animations	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	dino, graouts, sam, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Antoine Quint 2022-09-26 00:42:13 PDT

Sam Weinig made a good point in https://github.com/WebKit/WebKit/pull/4674#issuecomment-1257318558:

> As a side note, so not needed for this PR, unless there is some great reason I don't quite understand to
> keep it the way it is, I think we should consider modeling these different compositing operations in a way
> that is easier to understand.
> I think the obvious way to do this would be to stop using the blend() functions for computing the used
> from/to for additive/accumulative animations, and instead add a new entry point. Obviously this would
> add a bit of extra boilerplate, but I think the clarity would be good in the end.

I also agree with this, especially since we call blend() with progress = 1 at all times.

Comment 1 Radar WebKit Bug Importer 2022-10-03 00:43:16 PDT

<rdar://problem/100706662>