Allow Lua image generation to set NovelAI orientation

[enzi221]

PR Checklist

• Required Checks
  • Have you added type definitions?
  • Have you tested your changes?
  • Have you checked that it won't break any existing features?
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  • Have you checked if it works normally in all models?
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Summary

Lua generateImage() may set its own orientation.

To prevent troll scripts draining NAI credits, the script can't modify dimension but only its orientation.

• If w/h set to 1000/500 (landscape)
  • No orientation (default, backward compat) => 1000/500
  • Portrait => 500/1000
  • Landscape => 1000/500

Related Issues

None

Changes

Lua generateImage() now expects up to 4 parameters.

NAI branch of stableDiff.ts calls a new function, applyImageOrientation().

Impact

None, backward compatible.

Footnotes

1. Modifies the behavior of prompting, requesting, or handling responses from AI models. ↩

2. Over 80% of the code is AI generated. ↩

[cubicj]

I went through 1dbdede on this. applyImageOrientation only reorders the two configured edges, so the pixel count a script can request stays exactly what the settings allow, and the Variety+ sigma comes out identical since it is computed from the product. Only the NovelAI branch reads options, and the other five generateAIImage callers still pass four arguments, so their request bodies are unchanged from main. I also checked the Lua side with wasmoon directly, and a {orientation='portrait'} table arrives as a plain object while an omitted or nil fourth argument takes the default path as described.

Just one thing to flag, not blocking. A non-table fourth argument such as a bare 'portrait' string has no orientation field, so it skips the check and generates at the configured orientation without the error string coming back. pnpm check, pnpm test, and pnpm build are clean on this head.

Approving — thanks for the contribution!