// (c) Frank NIELSEN, INF555-TD3-2009
import java.applet.Applet;
import java.awt.*;
import java.awt.image.*;

public class BilateralFiltering extends Applet {
	static Image img, imgo;
	static int raster []; int rastero [];
	static PixelGrabber pg;
	static int width, height;
	static double sigmas=30.0;
	static double sigmai=1.25;
	static int k=1;
	
	static int [] BilateralFiltering(int [] raster, double sigmas, double sigmai, int k)
	{int [] result=null, rasteri;
	int grey=0, greyc, ngrey,alpha, index, indexc;	
	int i,j, ii, jj,l;
	int bound=(int)(3.0*sigmas);
	double m,p, wg, wr,w;


		for(l=0;l<k;l++)
		{
		System.out.println("Pass #"+l);
		result=new int[width*height];
		
		for(i=0;i<height;i++)
		for(j=0;j<width;j++)
		{
		m=p=0.0;
		index=j+i*width;
		alpha=-1;
		
		for(ii=-bound;ii<bound;ii++)
            for(jj=-bound;jj<bound;jj++) {
                    if((j+jj>=0) && (i+ii>=0) && (j+jj<width) && (i+ii<height))
                     {
		indexc=j+jj+(i+ii)*width; 
		grey = (raster[index] & 0xFF) ; 
		greyc= (raster[indexc] & 0xFF);  
       
        // Completer ici!
        }
        ngrey=(int)(m/p);
        result [ index ] = ( (alpha << 24) | (ngrey << 16) | (ngrey << 8) | ngrey);	
			}
		}
		
		raster=result;
		}
				
	return result;
	}
	
	public void init() {
	String nameimage=getParameter("img");
	
	Image image = getImage(getDocumentBase() , nameimage);
	pg = new PixelGrabber(image , 0 , 0 , -1 , -1 , true);
	try { pg.grabPixels();} 	catch (InterruptedException e) { }
	height=pg.getHeight(); width=pg.getWidth();
	System.out.println("Image filename:"+nameimage+" "+width+" "+height);
	raster = (int[])pg.getPixels();

	rastero=BilateralFiltering(raster, sigmas, sigmai, k);
	
	ImageProducer ip = new MemoryImageSource(width , height ,rastero , 0 , width);
	imgo = createImage(ip);
	}
	
	public void paint(Graphics g) {
		g.drawImage(imgo , 0 , 0 , this);
	}
}