// This example is from the book _Java AWT Reference_ by John Zukowski.
// Written by John Zukowski.  Copyright (c) 1997 O'Reilly & Associates.
// You may study, use, modify, and distribute this example for any purpose.
// This example is provided WITHOUT WARRANTY either expressed or
import java.awt.*;
import java.awt.image.*;
public class BlurFilter extends ImageFilter {
    private int savedWidth, savedHeight, savedPixels[];
    private static ColorModel defaultCM = ColorModel.getRGBdefault();
    public void setDimensions (int width, int height) {
        savedWidth=width;
        savedHeight=height;
        savedPixels=new int [width*height];
        consumer.setDimensions (width, height);
    }
    public void setColorModel (ColorModel model) {
// Change color model to model you are generating
        consumer.setColorModel (defaultCM);
    }
    public void setHints (int hintflags) {
// Set new hints, but preserve SINGLEFRAME setting
        consumer.setHints (TOPDOWNLEFTRIGHT | COMPLETESCANLINES |
                           SINGLEPASS | (hintflags & SINGLEFRAME));
    }
    private void setThePixels (int x, int y, int width, int height,
            ColorModel cm, Object pixels, int offset, int scansize) {
        int sourceOffset = offset;
        int destinationOffset = y * savedWidth + x;
        boolean bytearray = (pixels instanceof byte[]);
        for (int yy=0;yy<height;yy++) {
            for (int xx=0;xx<width;xx++)
                if (bytearray)
                    savedPixels[destinationOffset++]=
                        cm.getRGB(((byte[])pixels)[sourceOffset++]&0xff);
                else
                    savedPixels[destinationOffset++]=
                        cm.getRGB(((int[])pixels)[sourceOffset++]);
            sourceOffset += (scansize - width);
            destinationOffset += (savedWidth - width);
        }
    }
    public void setPixels (int x, int y, int width, int height,
           ColorModel cm, byte pixels[], int offset, int scansize) {
        setThePixels (x, y, width, height, cm, pixels, offset, scansize);
    }
    public void setPixels (int x, int y, int width, int height,
           ColorModel cm, int pixels[], int offset, int scansize) {
        setThePixels (x, y, width, height, cm, pixels, offset, scansize);
    }
    public void imageComplete (int status) {
        if ((status == IMAGEABORTED) || (status == IMAGEERROR)) {
            consumer.imageComplete (status);
            return;
        } else {
            int pixels[] = new int [savedWidth];
            int position, sumArray[], sumIndex;
            sumArray = new int [9]; // maxsize - vs. Vector for performance
            for (int yy=0;yy<savedHeight;yy++) {
                position=0;
                int start = yy * savedWidth;
                for (int xx=0;xx<savedWidth;xx++) {
                    sumIndex=0;
                    sumArray[sumIndex++] = savedPixels[start+xx];
                    if (yy != (savedHeight-1))
                        sumArray[sumIndex++] = savedPixels[start+xx+savedWidth];
                    if (yy != 0)
                        sumArray[sumIndex++] = savedPixels[start+xx-savedWidth];
                    if (xx != (savedWidth-1))
                        sumArray[sumIndex++] = savedPixels[start+xx+1];
                    if (xx != 0)
                        sumArray[sumIndex++] = savedPixels[start+xx-1];
                    if ((yy != 0) && (xx != 0))
                        sumArray[sumIndex++] = savedPixels[start+xx-savedWidth-1];
                    if ((yy != (savedHeight-1)) && (xx != (savedWidth-1)))
                        sumArray[sumIndex++] = savedPixels[start+xx+savedWidth+1];
                    if ((yy != 0) && (xx != (savedWidth-1)))
                        sumArray[sumIndex++] = savedPixels[start+xx-savedWidth+1];
                    if ((yy != (savedHeight-1)) && (xx != 0))
                        sumArray[sumIndex++] = savedPixels[start+xx+savedWidth-1];
                    pixels[position++] = avgPixels(sumArray, sumIndex);
                }
                consumer.setPixels (0, yy, savedWidth, 1, defaultCM,
                                    pixels, 0, savedWidth);
            }
            consumer.imageComplete (status);
        }
    }
    private int avgPixels (int pixels[], int size) {
        float redSum=0, greenSum=0, blueSum=0, alphaSum=0;
        for (int i=0;i<size;i++)
            try {
                int pixel = pixels[i];
                redSum   += defaultCM.getRed   (pixel);
                greenSum += defaultCM.getGreen (pixel);
                blueSum  += defaultCM.getBlue  (pixel);
                alphaSum += defaultCM.getAlpha (pixel);
            } catch (ArrayIndexOutOfBoundsException e) {
                System.out.println ("Ooops"); 
            }
        int redAvg   = (int)(redSum   / size);
        int greenAvg = (int)(greenSum / size);
        int blueAvg  = (int)(blueSum  / size);
        int alphaAvg = (int)(alphaSum / size);
        return ((0xff << 24) | (redAvg << 16) |
                (greenAvg << 8)  | (blueAvg << 0));
    }
}
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