import { RoomName } from "../types";
/**
 * Apply distance transform in-place on a given matrix.
 *
 * Output values are distance to the nearest wall.
 * @param cm initial matrix with 1 representing walkable. Modified in-place
 * @param oob out of bound value (optional: default to 255)
 * @returns modified cost matrix
 */
export declare function applyDistanceTransform(cm: CostMatrix, oob?: number): CostMatrix;
/** Maximum value of {@link CostMatrix} */
export declare const MATRIX_MAX = 255;
declare global {
    interface CostMatrix {
        _bits: number[];
    }
}
/**
 * Convert {@link RoomTerrain} to {@link CostMatrix}
 * @param roomName target room name
 * @param plain value for {@link TERRAIN_MASK_PLAIN}
 * @param swamp value for {@link TERRAIN_MASK_SWAMP}
 * @param wall value for {@link TERRAIN_MASK_WALL}
 * @param exclude optional matrix with non-zero values considered as wall
 * @returns a matrix of the terrain for the given room
 */
export declare function getRoomTerrainMatrix(roomName: RoomName, plain?: number, swamp?: number, wall?: number, exclude?: CostMatrix): CostMatrix;
/**
 * Apply distance transform algorithm for a given room.
 * @param roomName name of the target room. No visibility is needed
 * @param exclude optional matrix with non-zero values considered as wall
 * @returns A matrix where values are distance to the nearest wall
 */
export declare function getRoomDistanceTransform(roomName: RoomName, exclude?: CostMatrix): CostMatrix;