Image rotation using Fabulous.XamarinForms.FFImageLoading?

[gaelian]

Question / Discussion

I'm trying to translate this C# code for use with Fabulous.XamarinForms.FFImageLoading:

var t = ImageService.Instance.LoadStream(async c => await image.OpenReadAsync()); // image is a Xamarin.Essentials.FileResult.
t.Transform(new RotateTransformation(90));
using var imageStream = await t.AsPNGStreamAsync();

I've gotten this far in F#:

let t = FFImageLoading.ImageService.Instance.LoadStream(fun _ -> image.OpenReadAsync())
t.Transform(FFImageLoading.Transformations.RotateTransformation(90.)) |> ignore
use! imageStream = t.AsPNGStreamAsync() |> Async.AwaitTask

But in my F# code the AsPNGStreamAsync extension method cannot be found.

I also don't understand why open Fabulous.XamarinForms.FFImageLoading or open FFImageLoading both don't seem to work and I need to use use FFImageLoading.ImageService ... and FFImageLoading.Transformations ... instead. But I suspect this may have something to do with my problem.

Can anyone tell me what I'm doing wrong?

[Happypig375]

AsPNGStreamAsync is only defined in platform-specific versions. https://github.com/luberda-molinet/FFImageLoading/search?q=aspngstreamasync

Are you targeting .NET Standard?

[gaelian]

Yes. I’ve been trying to do this in the shared project of a Xamarin Forms app.

[Happypig375]

Then you should try this in platform-specific projects.

[vshapenko]

Glide and Nuke would be better for such cases.