import { AlphaMap } from "./AlphaMap.js";
//#region src/events/resolveAlphaMap.d.ts
/** Must stay in lockstep with ALPHA_DESCRIPTOR in @three-flatland/alphamap. */
declare const ALPHA_SIDECAR_DESCRIPTOR: {
  readonly kind: "alpha";
  readonly v: 1;
};
interface ResolveAlphaMapOptions {
  /** Skip the sidecar probe and always extract at runtime. */
  forceRuntime?: boolean;
  /**
   * Runtime extraction strategy. The SpriteSheetLoader passes a
   * texture-readback closure; injectable here for testing and for
   * worker-based readback later.
   */
  runtimeFallback: () => Promise<AlphaMap | null>;
}
/** Build an AlphaMap from decoded RGBA pixels (alpha lives in R). */
declare function decodeAlphaPng(rgba: Uint8ClampedArray | Uint8Array, width: number, height: number): AlphaMap;
/**
 * Resolve an alpha hitmask for a source image URL: probe the baked
 * `.alpha.png` sibling (hash-stamped — see flatland-bake alpha), load
 * it on a match, otherwise fall back to runtime extraction with a
 * devtime warning. Mirrors resolveNormalMap. Spec §10.
 */
declare function resolveAlphaMap(sourceURL: string, options: ResolveAlphaMapOptions): Promise<AlphaMap | null>;
//#endregion
export { ALPHA_SIDECAR_DESCRIPTOR, ResolveAlphaMapOptions, decodeAlphaPng, resolveAlphaMap };
//# sourceMappingURL=resolveAlphaMap.d.ts.map