Java tutorial
/* * Copyright (c) 2001-2013 JGoodies Software GmbH. All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * o Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * o Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * o Neither the name of JGoodies Software GmbH nor the names of * its contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ package com.jgoodies.looks.common; import java.awt.Image; import java.awt.image.BufferedImage; import java.awt.image.ColorModel; import java.awt.image.FilteredImageSource; import java.awt.image.ImageProducer; import java.awt.image.RGBImageFilter; import javax.swing.GrayFilter; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JComponent; import com.jgoodies.looks.Options; /** * An image filter that turns an icon into a grayscale icon. Used by * the JGoodies Windows and Plastic L&Fs to create a disabled icon.<p> * * The high-resolution gray filter can be disabled globally using * {@link Options#setHiResGrayFilterEnabled(boolean)}; it is enabled by default. * The global setting can be overridden per component by setting * the client property key {@link Options#HI_RES_DISABLED_ICON_CLIENT_KEY} * to {@code Boolean.FALSE}.<p> * * Thanks to Andrej Golovnin for suggesting a simpler filter formula. * * @author Karsten Lentzsch * @version $Revision: 1.13 $ */ public final class RGBGrayFilter extends RGBImageFilter { /** * Overrides default constructor; prevents instantiation. */ private RGBGrayFilter() { canFilterIndexColorModel = true; } /** * Returns an icon with a disabled appearance. This method is used * to generate a disabled icon when one has not been specified. * * @param component the component that will display the icon, may be null. * @param icon the icon to generate disabled icon from. * @return disabled icon, or null if a suitable icon can not be generated. */ public static Icon getDisabledIcon(JComponent component, Icon icon) { if ((icon == null) || (component == null) || (icon.getIconWidth() == 0) || (icon.getIconHeight() == 0)) { return null; } Image img; if (icon instanceof ImageIcon) { img = ((ImageIcon) icon).getImage(); } else { img = new BufferedImage(icon.getIconWidth(), icon.getIconHeight(), BufferedImage.TYPE_INT_ARGB); icon.paintIcon(component, img.getGraphics(), 0, 0); } if (!Options.isHiResGrayFilterEnabled() || (Boolean.FALSE.equals(component.getClientProperty(Options.HI_RES_DISABLED_ICON_CLIENT_KEY)))) { return new ImageIcon(GrayFilter.createDisabledImage(img)); } ImageProducer producer = new FilteredImageSource(img.getSource(), new RGBGrayFilter()); return new ImageIcon(component.createImage(producer)); } /** * Converts a single input pixel in the default RGB ColorModel to a single * gray pixel. * * @param x the horizontal pixel coordinate * @param y the vertical pixel coordinate * @param rgb the integer pixel representation in the default RGB color model * @return a gray pixel in the default RGB color model. * * @see ColorModel#getRGBdefault * @see #filterRGBPixels */ @Override public int filterRGB(int x, int y, int rgb) { // Find the average of red, green, and blue. float avg = (((rgb >> 16) & 0xff) / 255f + ((rgb >> 8) & 0xff) / 255f + (rgb & 0xff) / 255f) / 3; // Pull out the alpha channel. float alpha = (((rgb >> 24) & 0xff) / 255f); // Calculate the average. // Sun's formula: Math.min(1.0f, (1f - avg) / (100.0f / 35.0f) + avg); // The following formula uses less operations and hence is faster. avg = Math.min(1.0f, 0.35f + 0.65f * avg); // Convert back into RGB. return (int) (alpha * 255f) << 24 | (int) (avg * 255f) << 16 | (int) (avg * 255f) << 8 | (int) (avg * 255f); } }