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/*
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* Copyright (c) 1997, 1998, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package javax.swing;
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import java.awt.*;
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import java.awt.image.*;
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/**
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* An image filter that "disables" an image by turning
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* it into a grayscale image, and brightening the pixels
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* in the image. Used by buttons to create an image for
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* a disabled button.
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*
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* @author Jeff Dinkins
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* @author Tom Ball
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* @author Jim Graham
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*/
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public class GrayFilter extends RGBImageFilter {
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private boolean brighter;
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private int percent;
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/**
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* Creates a disabled image
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*/
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public static Image createDisabledImage (Image i) {
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GrayFilter filter = new GrayFilter(true, 50);
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ImageProducer prod = new FilteredImageSource(i.getSource(), filter);
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Image grayImage = Toolkit.getDefaultToolkit().createImage(prod);
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return grayImage;
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}
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/**
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* Constructs a GrayFilter object that filters a color image to a
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* grayscale image. Used by buttons to create disabled ("grayed out")
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* button images.
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*
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* @param b a boolean -- true if the pixels should be brightened
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* @param p an int in the range 0..100 that determines the percentage
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* of gray, where 100 is the darkest gray, and 0 is the lightest
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*/
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public GrayFilter(boolean b, int p) {
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brighter = b;
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percent = p;
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// canFilterIndexColorModel indicates whether or not it is acceptable
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// to apply the color filtering of the filterRGB method to the color
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// table entries of an IndexColorModel object in lieu of pixel by pixel
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// filtering.
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canFilterIndexColorModel = true;
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}
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/**
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* Overrides <code>RGBImageFilter.filterRGB</code>.
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*/
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public int filterRGB(int x, int y, int rgb) {
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// Use NTSC conversion formula.
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int gray = (int)((0.30 * ((rgb >> 16) & 0xff) +
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0.59 * ((rgb >> 8) & 0xff) +
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0.11 * (rgb & 0xff)) / 3);
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if (brighter) {
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gray = (255 - ((255 - gray) * (100 - percent) / 100));
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} else {
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gray = (gray * (100 - percent) / 100);
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}
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if (gray < 0) gray = 0;
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if (gray > 255) gray = 255;
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return (rgb & 0xff000000) | (gray << 16) | (gray << 8) | (gray << 0);
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}
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}
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