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/**
* 计算纹理的尺寸，保证纹理的尺寸是2次方。
* @param value 纹理的尺寸
* @returns number 纹理的尺寸是2次方
* @example
* ```
* floorPowerOfTwo(36)
* */
export declare function floorPowerOfTwo(value: number): number;