/*
* Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package javax.swing;
import java.awt.*;
import java.awt.image.*;
import sun.awt.image.MultiResolutionCachedImage;
/**
* An image filter that "disables" an image by turning
* it into a grayscale image, and brightening the pixels
* in the image. Used by buttons to create an image for
* a disabled button.
*
* @author Jeff Dinkins
* @author Tom Ball
* @author Jim Graham
* @since 1.2
*/
public class GrayFilter extends RGBImageFilter {
private boolean brighter;
private int percent;
/**
* Creates a disabled image
*
* @param i an {@code Image} to be created as disabled
* @return the new grayscale image created from {@code i}
*/
public static Image createDisabledImage(Image i) {
if (i instanceof MultiResolutionImage) {
return MultiResolutionCachedImage
.map((MultiResolutionImage) i,
(img) -> createDisabledImageImpl(img));
}
return createDisabledImageImpl(i);
}
private static Image createDisabledImageImpl(Image i) {
GrayFilter filter = new GrayFilter(true, 50);
ImageProducer prod = new FilteredImageSource(i.getSource(), filter);
Image grayImage = Toolkit.getDefaultToolkit().createImage(prod);
return grayImage;
}
/**
* Constructs a GrayFilter object that filters a color image to a
* grayscale image. Used by buttons to create disabled ("grayed out")
* button images.
*
* @param b a boolean -- true if the pixels should be brightened
* @param p an int in the range 0..100 that determines the percentage
* of gray, where 100 is the darkest gray, and 0 is the lightest
*/
public GrayFilter(boolean b, int p) {
brighter = b;
percent = p;
// canFilterIndexColorModel indicates whether or not it is acceptable
// to apply the color filtering of the filterRGB method to the color
// table entries of an IndexColorModel object in lieu of pixel by pixel
// filtering.
canFilterIndexColorModel = true;
}
/**
* Overrides <code>RGBImageFilter.filterRGB</code>.
*/
public int filterRGB(int x, int y, int rgb) {
// Use NTSC conversion formula.
int gray = (int)((0.30 * ((rgb >> 16) & 0xff) +
/**代码未完, 请加载全部代码(NowJava.com).**/