/*
 * @(#)HighlightFilter.java	1.4 96/12/06
 *
 * Copyright (c) 1994-1996 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
 * modify and redistribute this software in source and binary code form,
 * provided that i) this copyright notice and license appear on all copies of
 * the software; and ii) Licensee does not utilize the software in a manner
 * which is disparaging to Sun.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
 * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
 * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
 * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
 * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
 * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
 * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
 * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 *
 * This software is not designed or intended for use in on-line control of
 * aircraft, air traffic, aircraft navigation or aircraft communications; or in
 * the design, construction, operation or maintenance of any nuclear
 * facility. Licensee represents and warrants that it will not use or
 * redistribute the Software for such purposes.
 */

import java.applet.Applet;
import java.awt.Image;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.util.StringTokenizer;
import java.util.Vector;
import java.util.Hashtable;
import java.net.URL;
import java.awt.image.*;
import java.net.MalformedURLException;

/**
 * An image filter to highlight an image by brightening or darkening
 * the pixels in the images.
 *
 * @author 	Jim Graham
 * @version 	1.4, 12/06/96
 */
class HighlightFilter extends RGBImageFilter {
    boolean brighter;
    int percent;

    public HighlightFilter(boolean b, int p) {
	brighter = b;
	percent = p;
	canFilterIndexColorModel = true;
    }

    public int filterRGB(int x, int y, int rgb) {
	int r = (rgb >> 16) & 0xff;
	int g = (rgb >> 8) & 0xff;
	int b = (rgb >> 0) & 0xff;
	if (brighter) {
	    r = (255 - ((255 - r) * (100 - percent) / 100));
	    g = (255 - ((255 - g) * (100 - percent) / 100));
	    b = (255 - ((255 - b) * (100 - percent) / 100));
	} else {
	    r = (r * (100 - percent) / 100);
	    g = (g * (100 - percent) / 100);
	    b = (b * (100 - percent) / 100);
	}
	if (r < 0) r = 0;
	if (r > 255) r = 255;
	if (g < 0) g = 0;
	if (g > 255) g = 255;
	if (b < 0) b = 0;
	if (b > 255) b = 255;
	return (rgb & 0xff000000) | (r << 16) | (g << 8) | (b << 0);
    }
}