package pl.wroc.pwr.imagechannel.basic;

import pl.wroc.pwr.IOperator2P;
import pl.wroc.pwr.imagechannel.IImageChannel;
import pl.wroc.pwr.imagechannel.factory.ImageChannelFactory;

public class SubtractChannel implements IOperator2P<IImageChannel, IImageChannel, IImageChannel> {
	private boolean inPlace;

	public SubtractChannel() {
		this(false);
	}

	public SubtractChannel(boolean inPlace) {
		this.inPlace = inPlace;
	}

	public IImageChannel apply(IImageChannel inputChannel, IImageChannel parameterChannel) {
		if ((inputChannel == null)||(parameterChannel == null)) {
			return null;
		}
		IImageChannel outputChannel = this.inPlace ? inputChannel : new ImageChannelFactory(inputChannel).apply();
		final int maxIndex = inputChannel.getMaxIndex();
		for (int i = 0; i < maxIndex; i++) {
			outputChannel.setValue(i, inputChannel.getValue(i) - parameterChannel.getValue(i));
		}
		return outputChannel;
	}
}