Showing the changes to java/pkg/javax/swing/GrayFilter.java (1 of 18352 files). Show all
Unified · Split
| @@ -0,0 +1,93 @@ | ||
| 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 | +} | |