/**
 * A shader effect that applies a box blur to the sprite.
 * Commonly used for background defocus, depth-of-field simulation,
 * or UI backdrop blur.
 * @category Effects
 * @see {@link Renderable.shader} for usage
 * @example
 * // moderate blur
 * mySprite.shader = new BlurEffect(renderer, { strength: 2.0 });
 */
export default class BlurEffect extends ShaderEffect {
    /**
     * @param {import("../webgl_renderer.js").default} renderer - the current renderer instance
     * @param {object} [options] - effect options
     * @param {number} [options.strength=1.0] - blur strength in texels
     * @param {number[]} [options.textureSize=[256, 256]] - texture dimensions [width, height]
     */
    constructor(renderer: import("../webgl_renderer.js").default, options?: {
        strength?: number | undefined;
        textureSize?: number[] | undefined;
    });
    strength: number;
    /**
     * set the blur strength
     * @param {number} strength - blur strength in texels
     */
    setStrength(strength: number): void;
    /**
     * set the texture size
     * @param {number} width - texture width in pixels
     * @param {number} height - texture height in pixels
     */
    setTextureSize(width: number, height: number): void;
}
import ShaderEffect from "../shadereffect.js";
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