Expose ImmediateDrawingContext.DrawGeometry

[rabbitism]

What does the pull request do?

We have all infras to draw geometry in ImmediateDrawingContext. we should expose this to user.

What is the current behavior?

There is no way to draw geometry

What is the updated/expected behavior with this PR?

How was the solution implemented (if it's not obvious)?

Checklist

• Added unit tests (if possible)?
• Added XML documentation to any related classes?
• Consider submitting a PR to https://github.com/AvaloniaUI/avalonia-docs with user documentation

Breaking changes

Obsoletions / Deprecations

Fixed issues

[kekekeks]

Technically, Geometry is an AvaloniaObject and is dispatcher-bound. We need a separate IImmutableGeometry interface and a way to snapshot Geometry while on UI thread (note that snapshots are cheap, SKPath is copy-on-write)

[rabbitism]

Technically, Geometry is an AvaloniaObject and is dispatcher-bound. We need a separate IImmutableGeometry interface and a way to snapshot Geometry while on UI thread (note that snapshots are cheap, SKPath is copy-on-write)

maybe I can follow the pattern of GlyphRun.TryCreateImmutableGlyphRunReference ?

[avaloniaui-bot]

You can test this PR using the following package version. 12.0.999-cibuild0063098-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

[Gillibald]

IRef is already enough. So IRef should also work. Maybe all platform implementations should be immutable?

[rabbitism]

request api review.

Edit: IRef won't work because IGeometryImpl is not IDisposable, but acutally wondering why it's not, because we are disposing SKPath in some cases.

Avalonia/src/Skia/Avalonia.Skia/GeometryImpl.cs

Line 169 in b9995d1

_pathCache.Dispose();