JPG not resizing, just black

[tillkruss]

I'm noticing some .jpg result in a black image when resized. Is that an issue with the file, Nuke, or my code?

import Nuke
import NukeUI
import SwiftUI

struct Test: View {
    let url = "https://image.tmdb.org/t/p/original/f0JpsMQ9oEjKBD66Ky3qK3z7LGT.jpg"

    var body: some View {
        LazyImage(request: imageRequest(url)) { state in
            if let image = state.image {
                let _ = print("success")
                image.resizable()
            } else if state.error != nil {
                let _ = print(state.error)
            } else {
                Text("loading")
            }
        }
    }

    func imageRequest(_ urlString: String?) -> ImageRequest {
        let url = URL(string: urlString!)
        let request = URLRequest(url: url!, timeoutInterval: 5)

        return ImageRequest(
            urlRequest: request,
            processors: [
                .resize(size: CGSize(width: 325, height: 488))
            ]
        )
    }
}

#Preview {
    Test()
}

[kean]

Hey, thanks for the report, @tillkruss. It is a defect in the framework. The resize method does not handle grayscale images like this correctly.

RCA (for future reference)

• The input image is grayscale (8 bpp pixel format) and with no alpha channel
• The framework tries to create CGContext with the grayscale CS, 8 bpp and CGImageGetAlphaInfo.nonSkipLast, an unsupported combination
• The framework expects the CGContext init to fail and fall back to a safe combination of parameters supported on all Apple devices. But CGContext does get created anyway and fails to render images correctly.

Fixed in v12.7.

[tillkruss]

Thanks a lot! ❤️