/*
 * Copyright (c) 2011-2016, Peter Abeles. All Rights Reserved.
 *
 * This file is part of BoofCV (http://boofcv.org).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package boofcv.abst.filter.convolve;

import boofcv.core.image.border.BorderType;
import boofcv.struct.convolve.KernelBase;
import boofcv.struct.image.ImageGray;
import boofcv.struct.image.ImageType;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;


/**
 * Generalized interface for filtering images with convolution kernels while skipping pixels.
 * Can invoke different techniques for handling image borders.  The first pixel sampled is always (0,0) and the
 * sampled pixels are (x*skip,y*skip).
 *
 * @author Peter Abeles
 */
public class GenericConvolveDown
	implements ConvolveInterface
{
	Method m;
	KernelBase kernel;
	BorderType type;
	int skip;
	Class inputType;
	Class
 outputType;

	public GenericConvolveDown(Method m, KernelBase kernel,
							   BorderType type, int skip ,
							   Class inputType,
							   Class
 outputType) {
		this.m = m;
		this.kernel = kernel;
		this.type = type;
		this.skip = skip;
		this.inputType = inputType;
		this.outputType = outputType;
	}

	public int getSkip() {
		return skip;
	}

	public void setSkip(int skip) {
		this.skip = skip;
	}

	@Override
	public void process(Input input, Output output) {
		try {
			m.invoke(null,kernel,input,output,skip);
		} catch (IllegalAccessException e) {
			throw new RuntimeException(e);
		} catch (InvocationTargetException e) {
			throw new RuntimeException(e);
		}
	}

	@Override
	public int getHorizontalBorder() {
		if( type == BorderType.SKIP)
			return kernel.getRadius();
		else
			return 0;
	}

	@Override
	public int getVerticalBorder() {
		return getHorizontalBorder();
	}

	@Override
	public BorderType getBorderType() {
		return type;
	}

	@Override
	public ImageType getInputType() {
		return ImageType.single(inputType);
	}

	@Override
	public ImageType
 getOutputType() {
		return ImageType.single(outputType);
	}
}