Tong Mu dcae0c4ca0
Add RSuperellipse support to Web (global cache) (#171489)
This PR adds `RSuperellipse` support to Web, so that these ops will
actually draw `RSuperellipse`s instead of falling back to `RRect`s,
except for platform views.
* (I was told in some earlier comments that RSuperellipses should fall
back to RRects for platform views but I can't remember where for now. If
reviewers think otherwise I can implement them right away or make this a
TODO in the future.)

The `RSuperellipse`s are drawn after being converted to paths. The
algorithm is nothing new, but already used in
`round_superellipse_param.cc`.

For performance optimization, `RSuperellipse`s that have uniform radii
will have their paths cached in a global cache after offset
normalization.

This PR does not add any new public APIs. (Although, I'm planning to
also implement this to the main `dart:ui` in the future to support
non-Impeller-nor-Web platforms, which will need
`RSuperellipse.toPathOffset` public.)

Fixes https://github.com/flutter/flutter/issues/163718

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above.
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- [ ] I added new tests to check the change I am making, or this PR is
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Fixes] where supported.
- [ ] All existing and new tests are passing.

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2025-07-12 05:43:32 +00:00
..

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