/**
 * Copyright 2010-2013 Jingjing Li.
 *
 * This file is part of jplot2d.
 *
 * jplot2d is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or any later version.
 *
 * jplot2d is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with jplot2d. If not, see .
 */
package org.jplot2d.data;

/**
 * This class extends ImageMaskBuffer and stores data internally as booleans. It can optionally take an offset, so that
 * mask in an existing array can be used even if the interesting mask doesn't start at array location zero.
 * 
 * @author Jingjing Li
 * 
 */
public interface BooleanMaskBuffer extends ImageMaskBuffer {

	public static class Array implements BooleanMaskBuffer {
		private final boolean[] mask;
		private final int offset;

		public Array(boolean[] mask) {
			this(mask, 0);
		}

		public Array(boolean[] mask, int offset) {
			this.mask = mask;
			this.offset = offset;
		}

		public boolean isMasked(int x, int y) {
			return mask[offset + x + y];
		}
	}

	public static class Array2D implements BooleanMaskBuffer {
		private final boolean[][] mask;
		private final int xoffset, yoffset;

		public Array2D(boolean[][] mask) {
			this(mask, 0, 0);
		}

		public Array2D(boolean[][] mask, int xoffset, int yoffset) {
			this.mask = mask;
			this.xoffset = xoffset;
			this.yoffset = yoffset;
		}

		public boolean isMasked(int x, int y) {
			return mask[yoffset + y][xoffset + x];
		}
	}

}