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| 1 | /* | ||
| 2 | * Copyright (c) 1997, 1998, Oracle and/or its affiliates. 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. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * 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 | } | ||