export const OUTPAINTING_DEFAULT_PROMPT = "将画面自然延展，补充完整场景";

interface MediaDimensions {
  width: number;
  height: number;
}

interface OutpaintingInsets {
  top: number;
  left: number;
  right: number;
  bottom: number;
}

export function deriveOutpaintingOutputDimensions(
  sourceDimensions: MediaDimensions | null | undefined,
  params: OutpaintingInsets
): MediaDimensions | null {
  if (!sourceDimensions) return null;
  return {
    width: Math.max(1, Math.round(sourceDimensions.width * (1 + params.left + params.right))),
    height: Math.max(1, Math.round(sourceDimensions.height * (1 + params.top + params.bottom))),
  };
}