Function fetchUrlImageRaw

src/utils/urlImageFiles.ts:141–165

(
  imageUrlBase: string | null,
  imageName: string,
  explicitUrl?: string
)

 * Metric computations use this path because lossy cached images bias PSNR.
 */
export async function fetchUrlImageRaw(
  imageUrlBase: string | null,
  imageName: string,
  explicitUrl?: string
): Promise<File | null> {
  const resolved = resolveImageRequestUrl(imageUrlBase, imageName, explicitUrl);
  if (!resolved) {
    return null;
  }
  const { url: imageUrl, filename } = resolved;

  try {
    const response = await fetch(imageUrl);
    if (!response.ok) {
      appLogger.warn(`[URL Image] Failed to fetch raw ${imageName}: ${response.status}`);
      return null;
    }

    const blob = await response.blob();
    return new File([blob], filename, { type: blob.type || 'application/octet-stream' });
  } catch (err) {
    appLogger.warn(`[URL Image] Error fetching raw ${imageName}:`, err);
    return null;
  }
}

/**
 * Fetch a mask from URL.