No way to apply processors to placeholder

[ertembiyik]

There is currently no way (or I haven't found it) to apply processors to placeholders and cache them.
It could be useful for cases where the loaded image and placeholder should have the same corner radius, blur, size, etc.

Also as an addition, it would be grate to add a localImage option to ImageRequest for cases where you want to use an already existing image with the power of processors in Nuke (I think under the hood it could be an alias to placeholder, but a more friendly higher api for the ones who try to find how to apply processors to an already existing image).

The new initializer for ImageRequest could look something like this:

public init(
        id: String,
        image: PlatformImage,
        processors: [any ImageProcessing] = [],
        priority: Priority = .normal,
        options: Options = [],
       userInfo: [UserInfoKey: Any]? = nil
    )

[kean]

Hey, you can apply a processor to a placeholder or any other image directly:

let processor = ImageProcessors.Resize(size: CGSize(width: 400, height: 400), unit: .pixels, contentMode: .aspectFill)
let output = processor.process(image)

I'd suggest then caching the processed images manually. Would that cover your use case?

[kean]

I added a new ImageRequest initializer that accepts an async closure returning an ImageContainer directly, bypassing the data loading and decoding pipeline:

  public init(
      id: String,
      image: @Sendable @escaping () async throws -> ImageContainer,
      ...
  )

It's similar to the existing init(id:data:) requires raw Data. It can be used for either fetching images using a third-party system and or processing an image already in memory, so it should cover this use-case:

  let request = ImageRequest(
      id: "processed-\(asset.localIdentifier)",
      image: { ImageContainer(image: myInMemoryImage) }
  )
  let result = try await pipeline.image(for: request)