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GrayFilter.java
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1998-06-30
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/*
* @(#)GrayFilter.java 1.6 98/01/30
*
* Copyright (c) 1997 Sun Microsystems, Inc. All Rights Reserved.
*
* This software is the confidential and proprietary information of Sun
* Microsystems, Inc. ("Confidential Information"). You shall not
* disclose such Confidential Information and shall use it only in
* accordance with the terms of the license agreement you entered into
* with Sun.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
* SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
* SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
* THIS SOFTWARE OR ITS DERIVATIVES.
*
*/
package com.sun.java.swing;
import java.awt.*;
import java.awt.image.*;
/**
* An image filter that "disables" an image by turning
* it into a grayscale image, and brightening the pixels
* in the image.
*
* @author Jeff Dinkins
* @author Tom Ball
* @author Jim Graham
* @version 1.6 01/30/98
*/
public class GrayFilter extends RGBImageFilter {
private boolean brighter;
private int percent;
/**
* Creates a disabled image
*/
public static Image createDisabledImage (Image i) {
GrayFilter filter = new GrayFilter(true, 50);
ImageProducer prod = new FilteredImageSource(i.getSource(), filter);
Image grayImage = Toolkit.getDefaultToolkit().createImage(prod);
return grayImage;
}
public GrayFilter(boolean b, int p) {
brighter = b;
percent = p;
// canFilterIndexColorModel indicates whether or not it is acceptable
// to apply the color filtering of the filterRGB method to the color
// table entries of an IndexColorModel object in lieu of pixel by pixel
// filtering.
canFilterIndexColorModel = true;
}
public int filterRGB(int x, int y, int rgb) {
// Use NTSC conversion formula.
int gray = (int)((0.30 * ((rgb >> 16) & 0xff) +
0.59 * ((rgb >> 8) & 0xff) +
0.11 * (rgb & 0xff)) / 3);
if (brighter) {
gray = (255 - ((255 - gray) * (100 - percent) / 100));
} else {
gray = (gray * (100 - percent) / 100);
}
if (gray < 0) gray = 0;
if (gray > 255) gray = 255;
return (rgb & 0xff000000) | (gray << 16) | (gray << 8) | (gray << 0);
}
}