import type { Composition } from '../player/Composition';
import type { FilterDefine, FilterShaderDefine } from '../render/filter';
import type { FixedNumberExpression } from '@predy-js/specification';
export interface AlphaMaskFilter {
    xOpacity?: FixedNumberExpression;
    yOpacity?: FixedNumberExpression;
}
export declare function precompileAlphaMask(): FilterShaderDefine[];
export declare function registerAlphaMaskFilter(comp: Composition, filter: AlphaMaskFilter): FilterDefine;