J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1997-1998 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | package javax.swing; |
| 26 | |
| 27 | import java.awt.*; |
| 28 | import java.awt.image.*; |
| 29 | |
| 30 | /** |
| 31 | * An image filter that "disables" an image by turning |
| 32 | * it into a grayscale image, and brightening the pixels |
| 33 | * in the image. Used by buttons to create an image for |
| 34 | * a disabled button. |
| 35 | * |
| 36 | * @author Jeff Dinkins |
| 37 | * @author Tom Ball |
| 38 | * @author Jim Graham |
| 39 | */ |
| 40 | public class GrayFilter extends RGBImageFilter { |
| 41 | private boolean brighter; |
| 42 | private int percent; |
| 43 | |
| 44 | /** |
| 45 | * Creates a disabled image |
| 46 | */ |
| 47 | public static Image createDisabledImage (Image i) { |
| 48 | GrayFilter filter = new GrayFilter(true, 50); |
| 49 | ImageProducer prod = new FilteredImageSource(i.getSource(), filter); |
| 50 | Image grayImage = Toolkit.getDefaultToolkit().createImage(prod); |
| 51 | return grayImage; |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * Constructs a GrayFilter object that filters a color image to a |
| 56 | * grayscale image. Used by buttons to create disabled ("grayed out") |
| 57 | * button images. |
| 58 | * |
| 59 | * @param b a boolean -- true if the pixels should be brightened |
| 60 | * @param p an int in the range 0..100 that determines the percentage |
| 61 | * of gray, where 100 is the darkest gray, and 0 is the lightest |
| 62 | */ |
| 63 | public GrayFilter(boolean b, int p) { |
| 64 | brighter = b; |
| 65 | percent = p; |
| 66 | |
| 67 | // canFilterIndexColorModel indicates whether or not it is acceptable |
| 68 | // to apply the color filtering of the filterRGB method to the color |
| 69 | // table entries of an IndexColorModel object in lieu of pixel by pixel |
| 70 | // filtering. |
| 71 | canFilterIndexColorModel = true; |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * Overrides <code>RGBImageFilter.filterRGB</code>. |
| 76 | */ |
| 77 | public int filterRGB(int x, int y, int rgb) { |
| 78 | // Use NTSC conversion formula. |
| 79 | int gray = (int)((0.30 * ((rgb >> 16) & 0xff) + |
| 80 | 0.59 * ((rgb >> 8) & 0xff) + |
| 81 | 0.11 * (rgb & 0xff)) / 3); |
| 82 | |
| 83 | if (brighter) { |
| 84 | gray = (255 - ((255 - gray) * (100 - percent) / 100)); |
| 85 | } else { |
| 86 | gray = (gray * (100 - percent) / 100); |
| 87 | } |
| 88 | |
| 89 | if (gray < 0) gray = 0; |
| 90 | if (gray > 255) gray = 255; |
| 91 | return (rgb & 0xff000000) | (gray << 16) | (gray << 8) | (gray << 0); |
| 92 | } |
| 93 | } |