package pl.wroc.pwr.imagechannel.basic;

import pl.wroc.pwr.IOperator2P;
import pl.wroc.pwr.imagechannel.IImageChannel;
import pl.wroc.pwr.imagechannel.model.ImageChannel;

public class SubImageChannel implements IOperator2P<IImageChannel, IImageChannel, int[]> {
	private static final long serialVersionUID = 1289816752314168282L;

	public IImageChannel apply(IImageChannel inputChannel, int[] box) {
		if (inputChannel == null) {
			return null;
		}
		IImageChannel outputChannel = new ImageChannel(box[2] - box[0], box[3] - box[1]);

		for (int x = 0; x < outputChannel.getXSize(); x++) {
			for (int y = 0; y < outputChannel.getYSize(); y++) {
				int sX = x + box[0];
				int sY = y + box[1];
				outputChannel.setValue(x, y, inputChannel.getValue(sX, sY));
			}
		}
		return outputChannel;
	}
}