ImageGenerationParameterExtension.WithPhotomaker()

[Zurzar]

Title: ImageGenerationParameterExtension.WithPhotomaker() is a no-op — doesn't set any parameter

Version: StableDiffusion.NET 7.0.0 (NuGet)

Description:

While trying to use PhotoMaker for face-consistent generation, I decompiled StableDiffusion.NET.dll and found that WithPhotomaker() on ImageGenerationParameter doesn't actually do anything — it just returns the parameter object unchanged:

public static ImageGenerationParameter WithPhotomaker(this ImageGenerationParameter parameter, string inputIdImageDirectory, float? styleStrength = null, bool? normalizeInput = null)
{
    return parameter;
}

The signature looks correct (matches stable-diffusion.cpp's --input-id-images-dir, --style-ratio, --normalize-input flags), but none of the arguments are stored anywhere on parameter.

For context: DiffusionModelParameter.WithPhotomaker(string stackedIdEmbeddingsDirectory) (on the model, not the generation params) does correctly set parameter.StackedIdEmbeddingsDirectory, — but there's no way to actually pass the reference/id images through the public API, since this generation-level method is empty.

Expected behavior: the method should set something like parameter.InputIdImageDirectory, parameter.StyleStrength, parameter.NormalizeInput (or equivalent fields consumed by the native call), matching how WithControlNet() or WithRefImages() populate their respective fields.

Repro:

using DiffusionModel sd = new(DiffusionModelParameter.Create()
    .WithModelPath("<sdxl_model>")
    .WithPhotomaker("<path_to_photomaker-v2.safetensors>"));

var img = sd.GenerateImage(ImageGenerationParameter
    .TextToImage("a woman img, 40 years old, photorealistic")
    .WithPhotomaker("<path_to_id_images_dir>", styleStrength: 20f)
    .WithSDXLDefaults());

No error is thrown, but the id images are silently ignored since nothing in WithPhotomaker() propagates them further.

Happy to test a fix if you point me in the right direction — thanks for maintaining this project!