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/*
 * Rgb3x3Average.java
 *
 * Created on August 27, 2006, 1:58 PM
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 *
 * Copyright 2007 by Jon A. Webb
 *     This program 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
 *    (at your option) any later version.
 *
 *    This program 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 Lesser General Public License for more details.
 *
 *    You should have received a copy of the Lesser GNU General Public License
 *    along with this program.  If not, see .
 *
 */
package com.github.ojil.algorithm;

import com.github.ojil.core.Error;
import com.github.ojil.core.Image;
import com.github.ojil.core.PipelineStage;
import com.github.ojil.core.RgbImage;
import com.github.ojil.core.RgbVal;

/**
 * Pipeline stage performs a 3x3 RGB average of the input.
 * @author webb
 */
public class Rgb3x3Average extends PipelineStage {
    
    /**
     * Creates a new instance of Rgb3x3Average
     */
    public Rgb3x3Average() {
    }
       
    /**
     * Do a color 3x3 average of the input image. The red, green, and blue
     * bands are averaged independently. The code has been written to be
     * as efficient as possible. Borders are handled by duplicating the
     * first or last row, and replacing the first and last column
     * with 0, when doing the average.
     *
     * @param imageInput the input image
     * @throws com.github.ojil.core.Error if imageInput is not an RgbImage
     */
    public void push(Image imageInput) throws com.github.ojil.core.Error 
   {
        if (!(imageInput instanceof RgbImage)) 
        {
            throw new Error(
                			Error.PACKAGE.ALGORITHM,
                			ErrorCodes.IMAGE_NOT_RGBIMAGE,
                			imageInput.toString(),
                			null,
                			null);
        }
        
        int cWidth  = imageInput.getWidth();
        int cHeight = imageInput.getHeight();
        Integer[] rgbInput = ((RgbImage)imageInput).getData();
        
        RgbImage imageResult = new RgbImage(cWidth, cHeight);
        Integer[] rgbOutput = imageResult.getData();
        
        for(int i=0;i