| /* GrayFilter.java -- Java class for filtering Pixels to produce Gray Pictures |
| Copyright (C) 1999, 2004 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package javax.swing; |
| |
| import java.awt.Image; |
| import java.awt.Toolkit; |
| import java.awt.image.FilteredImageSource; |
| import java.awt.image.RGBImageFilter; |
| |
| /** |
| * Produces grayscale images out of colored images. This is used to provide |
| * default disabled icons for buttons. |
| * |
| * @author original author unknown |
| */ |
| public class GrayFilter extends RGBImageFilter |
| { |
| private boolean b; |
| private double p; |
| |
| /** |
| * Create a GrayFilter. If b is true then brighten. Also, indicate how much |
| * gray. |
| * |
| * @param b if brighten |
| * @param p percent of gray, 0 - 100 |
| */ |
| public GrayFilter(boolean b, int p) |
| { |
| this.b = b; //FIXME - HANDLE THIS |
| this.p = (1. - (p / 100.)) / 3.; |
| } |
| |
| /** |
| * Create grayed image |
| * |
| * @param src image to gray |
| * |
| * @return a grayed image |
| */ |
| public static Image createDisabledImage(Image src) |
| { |
| return (Toolkit.getDefaultToolkit().createImage(new FilteredImageSource( |
| src.getSource(), new GrayFilter(true, 0)))); |
| } |
| |
| /** |
| * Filter RGB to gray |
| */ |
| public int filterRGB(int x, int y, int rgb) |
| { |
| int alpha = 0xff000000 & rgb; |
| int red = (0xff0000 & rgb) >> 16; |
| int green = (0xff00 & rgb) >> 8; |
| int blue = (0xff & rgb); |
| int gray = (int) ((0.299 * red + 0.587 * green + 0.114 * blue) * p); |
| if (b) |
| gray = Math.min(gray + 128, 255); |
| return gray | gray << 8 | gray << 16 | alpha ; |
| } |
| } |