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jlechner |
/* GrayFilter.java -- Java class for filtering Pixels to produce Gray Pictures
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Copyright (C) 1999, 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.swing;
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import java.awt.Image;
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import java.awt.Toolkit;
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import java.awt.image.FilteredImageSource;
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import java.awt.image.RGBImageFilter;
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/**
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* Produces grayscale images out of colored images. This is used to provide
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* default disabled icons for buttons.
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*
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* @author original author unknown
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*/
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public class GrayFilter extends RGBImageFilter
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{
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private boolean b;
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private double p;
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/**
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* Create a GrayFilter. If b is true then brighten. Also, indicate how much
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* gray.
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*
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* @param b if brighten
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* @param p percent of gray, 0 - 100
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*/
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public GrayFilter(boolean b, int p)
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{
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this.b = b; //FIXME - HANDLE THIS
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this.p = (1. - (p / 100.)) / 3.;
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}
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/**
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* Create grayed image
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*
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* @param src image to gray
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*
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* @return a grayed image
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*/
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public static Image createDisabledImage(Image src)
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{
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return (Toolkit.getDefaultToolkit().
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createImage(new FilteredImageSource(src.getSource(),
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new GrayFilter(true, 0))));
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}
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/**
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* Filter RGB to gray
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*/
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public int filterRGB(int x, int y, int rgb)
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{
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int alpha = 0xff000000 & rgb;
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int red = (0xff0000 & rgb) >> 16;
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int green = (0xff00 & rgb) >> 8;
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int blue = (0xff & rgb);
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int gray = (int) ((0.299 * red + 0.587 * green + 0.114 * blue) * p);
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if (b)
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gray = Math.min(gray + 128, 255);
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return gray | gray << 8 | gray << 16 | alpha ;
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}
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}
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