Function loadFrustumBitmapFromFile

src/hooks/useFrustumTexture.ts:77–111

(
  imageFile: File,
  imageName: string
)

}

async function loadFrustumBitmapFromFile(
  imageFile: File,
  imageName: string
): Promise<ImageBitmap | null> {
  const cached = getCachedFrustumBitmap(bitmapCache, imageName);
  if (cached) return cached;

  const existingLoad = frustumBitmapLoads.get(imageName);
  if (existingLoad) return existingLoad;

  const loadGeneration = frustumBitmapCacheGeneration;
  const load = createImageBitmapWithTimeout(imageFile, FRUSTUM_BITMAP_DECODE_TIMEOUT)
    .then((decodedBitmap) => resizeImageBitmapToMaxSizeWithTimeout(
      decodedBitmap,
      SIZE.frustumMaxSize,
      FRUSTUM_BITMAP_DECODE_TIMEOUT
    ))
    .then((bitmap) => {
      if (loadGeneration !== frustumBitmapCacheGeneration) {
        bitmap.close();
        return null;
      }

      bitmapCache.set(imageName, { bitmap, lastUsed: Date.now() });
      notifyFrustumTextureCacheChanged();
      return bitmap;
    })
    .catch(() => null)
    .finally(() => {
      frustumBitmapLoads.delete(imageName);
    });

  frustumBitmapLoads.set(imageName, load);
  return load;
}

/**
 * Return a cached resized bitmap for image-plane texture creation.