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765 lines
32 KiB
Java
765 lines
32 KiB
Java
/*
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* $Id$
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*
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* Dual-licensed under LGPL (Sun and Romain Guy) and BSD (Romain Guy).
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*
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* Copyright 2005 Sun Microsystems, Inc., 4150 Network Circle,
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* Santa Clara, California 95054, U.S.A. All rights reserved.
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*
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* Copyright (c) 2006 Romain Guy <romain.guy@mac.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.jdesktop.swingx.graphics;
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import java.awt.Graphics;
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import java.awt.Graphics2D;
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import java.awt.GraphicsConfiguration;
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import java.awt.GraphicsEnvironment;
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import java.awt.Image;
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import java.awt.RenderingHints;
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import java.awt.Shape;
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import java.awt.Transparency;
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import java.awt.geom.Area;
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import java.awt.image.BufferedImage;
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import java.awt.image.ColorModel;
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import java.awt.image.Raster;
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import java.awt.image.WritableRaster;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.URL;
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import javax.imageio.ImageIO;
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/**
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* <p><code>GraphicsUtilities</code> contains a set of tools to perform
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* common graphics operations easily. These operations are divided into
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* several themes, listed below.</p>
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*
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* <h2>Compatible Images</h2>
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*
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* <p>Compatible images can, and should, be used to increase drawing
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* performance. This class provides a number of methods to load compatible
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* images directly from files or to convert existing images to compatibles
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* images.</p>
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*
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* <h2>Creating Thumbnails</h2>
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*
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* <p>This class provides a number of methods to easily scale down images.
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* Some of these methods offer a trade-off between speed and result quality and
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* shouuld be used all the time. They also offer the advantage of producing
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* compatible images, thus automatically resulting into better runtime
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* performance.</p>
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*
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* <p>All these methodes are both faster than
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* {@link java.awt.Image#getScaledInstance(int, int, int)} and produce
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* better-looking results than the various <code>drawImage()</code> methods
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* in {@link java.awt.Graphics}, which can be used for image scaling.</p>
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* <h2>Image Manipulation</h2>
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*
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* <p>This class provides two methods to get and set pixels in a buffered image.
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* These methods try to avoid unmanaging the image in order to keep good
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* performance.</p>
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*
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* @author Romain Guy <romain.guy@mac.com>
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* @author rbair
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*/
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public class GraphicsUtilities {
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private GraphicsUtilities() {
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}
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// Returns the graphics configuration for the primary screen
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private static GraphicsConfiguration getGraphicsConfiguration() {
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return GraphicsEnvironment.getLocalGraphicsEnvironment().
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getDefaultScreenDevice().getDefaultConfiguration();
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}
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private static boolean isHeadless() {
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return GraphicsEnvironment.isHeadless();
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}
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/**
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* Converts the specified image into a compatible buffered image.
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*
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* @param img
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* the image to convert
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* @return a compatible buffered image of the input
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*/
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public static BufferedImage convertToBufferedImage(Image img) {
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BufferedImage buff = createCompatibleTranslucentImage(
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img.getWidth(null), img.getHeight(null));
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Graphics2D g2 = buff.createGraphics();
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try {
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g2.drawImage(img, 0, 0, null);
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} finally {
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g2.dispose();
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}
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return buff;
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}
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/**
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* <p>Returns a new <code>BufferedImage</code> using the same color model
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* as the image passed as a parameter. The returned image is only compatible
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* with the image passed as a parameter. This does not mean the returned
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* image is compatible with the hardware.</p>
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*
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* @param image the reference image from which the color model of the new
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* image is obtained
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* @return a new <code>BufferedImage</code>, compatible with the color model
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* of <code>image</code>
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*/
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public static BufferedImage createColorModelCompatibleImage(BufferedImage image) {
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ColorModel cm = image.getColorModel();
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return new BufferedImage(cm,
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cm.createCompatibleWritableRaster(image.getWidth(),
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image.getHeight()),
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cm.isAlphaPremultiplied(), null);
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}
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/**
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* <p>Returns a new compatible image with the same width, height and
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* transparency as the image specified as a parameter. That is, the
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* returned BufferedImage will be compatible with the graphics hardware.
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* If this method is called in a headless environment, then
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* the returned BufferedImage will be compatible with the source
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* image.</p>
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*
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* @see java.awt.Transparency
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* @see #createCompatibleImage(int, int)
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* @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
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* @see #createCompatibleTranslucentImage(int, int)
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* @see #loadCompatibleImage(java.net.URL)
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* @see #toCompatibleImage(java.awt.image.BufferedImage)
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* @param image the reference image from which the dimension and the
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* transparency of the new image are obtained
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* @return a new compatible <code>BufferedImage</code> with the same
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* dimension and transparency as <code>image</code>
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*/
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public static BufferedImage createCompatibleImage(BufferedImage image) {
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return createCompatibleImage(image, image.getWidth(), image.getHeight());
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}
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/**
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* <p>Returns a new compatible image of the specified width and height, and
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* the same transparency setting as the image specified as a parameter.
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* That is, the returned <code>BufferedImage</code> is compatible with
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* the graphics hardware. If the method is called in a headless
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* environment, then the returned BufferedImage will be compatible with
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* the source image.</p>
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*
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* @see java.awt.Transparency
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* @see #createCompatibleImage(java.awt.image.BufferedImage)
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* @see #createCompatibleImage(int, int)
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* @see #createCompatibleTranslucentImage(int, int)
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* @see #loadCompatibleImage(java.net.URL)
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* @see #toCompatibleImage(java.awt.image.BufferedImage)
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* @param width the width of the new image
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* @param height the height of the new image
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* @param image the reference image from which the transparency of the new
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* image is obtained
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* @return a new compatible <code>BufferedImage</code> with the same
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* transparency as <code>image</code> and the specified dimension
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*/
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public static BufferedImage createCompatibleImage(BufferedImage image,
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int width, int height) {
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return isHeadless() ?
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new BufferedImage(width, height, image.getType()) :
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getGraphicsConfiguration().createCompatibleImage(width, height,
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image.getTransparency());
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}
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/**
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* <p>Returns a new opaque compatible image of the specified width and
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* height. That is, the returned <code>BufferedImage</code> is compatible with
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* the graphics hardware. If the method is called in a headless
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* environment, then the returned BufferedImage will be compatible with
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* the source image.</p>
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*
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* @see #createCompatibleImage(java.awt.image.BufferedImage)
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* @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
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* @see #createCompatibleTranslucentImage(int, int)
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* @see #loadCompatibleImage(java.net.URL)
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* @see #toCompatibleImage(java.awt.image.BufferedImage)
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* @param width the width of the new image
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* @param height the height of the new image
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* @return a new opaque compatible <code>BufferedImage</code> of the
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* specified width and height
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*/
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public static BufferedImage createCompatibleImage(int width, int height) {
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return isHeadless() ?
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new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB) :
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getGraphicsConfiguration().createCompatibleImage(width, height);
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}
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/**
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* <p>Returns a new translucent compatible image of the specified width and
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* height. That is, the returned <code>BufferedImage</code> is compatible with
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* the graphics hardware. If the method is called in a headless
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* environment, then the returned BufferedImage will be compatible with
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* the source image.</p>
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*
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* @see #createCompatibleImage(java.awt.image.BufferedImage)
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* @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
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* @see #createCompatibleImage(int, int)
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* @see #loadCompatibleImage(java.net.URL)
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* @see #toCompatibleImage(java.awt.image.BufferedImage)
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* @param width the width of the new image
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* @param height the height of the new image
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* @return a new translucent compatible <code>BufferedImage</code> of the
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* specified width and height
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*/
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public static BufferedImage createCompatibleTranslucentImage(int width,
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int height) {
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return isHeadless() ?
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new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB) :
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getGraphicsConfiguration().createCompatibleImage(width, height,
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Transparency.TRANSLUCENT);
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}
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/**
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* <p>
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* Returns a new compatible image from a stream. The image is loaded from
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* the specified stream and then turned, if necessary into a compatible
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* image.
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* </p>
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*
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* @see #createCompatibleImage(java.awt.image.BufferedImage)
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* @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
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* @see #createCompatibleImage(int, int)
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* @see #createCompatibleTranslucentImage(int, int)
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* @see #toCompatibleImage(java.awt.image.BufferedImage)
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* @param in
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* the stream of the picture to load as a compatible image
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* @return a new translucent compatible <code>BufferedImage</code> of the
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* specified width and height
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* @throws java.io.IOException
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* if the image cannot be read or loaded
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*/
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public static BufferedImage loadCompatibleImage(InputStream in) throws IOException {
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BufferedImage image = ImageIO.read(in);
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if(image == null) return null;
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return toCompatibleImage(image);
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}
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/**
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* <p>Returns a new compatible image from a URL. The image is loaded from the
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* specified location and then turned, if necessary into a compatible
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* image.</p>
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*
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* @see #createCompatibleImage(java.awt.image.BufferedImage)
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* @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
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* @see #createCompatibleImage(int, int)
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* @see #createCompatibleTranslucentImage(int, int)
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* @see #toCompatibleImage(java.awt.image.BufferedImage)
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* @param resource the URL of the picture to load as a compatible image
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* @return a new translucent compatible <code>BufferedImage</code> of the
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* specified width and height
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* @throws java.io.IOException if the image cannot be read or loaded
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*/
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public static BufferedImage loadCompatibleImage(URL resource)
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throws IOException {
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BufferedImage image = ImageIO.read(resource);
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return toCompatibleImage(image);
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}
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/**
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* <p>Return a new compatible image that contains a copy of the specified
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* image. This method ensures an image is compatible with the hardware,
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* and therefore optimized for fast blitting operations.</p>
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*
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* <p>If the method is called in a headless environment, then the returned
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* <code>BufferedImage</code> will be the source image.</p>
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*
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* @see #createCompatibleImage(java.awt.image.BufferedImage)
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* @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
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* @see #createCompatibleImage(int, int)
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* @see #createCompatibleTranslucentImage(int, int)
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* @see #loadCompatibleImage(java.net.URL)
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* @param image the image to copy into a new compatible image
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* @return a new compatible copy, with the
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* same width and height and transparency and content, of <code>image</code>
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*/
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public static BufferedImage toCompatibleImage(BufferedImage image) {
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if (isHeadless()) {
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return image;
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}
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if (image.getColorModel().equals(
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getGraphicsConfiguration().getColorModel())) {
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return image;
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}
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BufferedImage compatibleImage =
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getGraphicsConfiguration().createCompatibleImage(
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image.getWidth(), image.getHeight(),
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image.getTransparency());
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Graphics g = compatibleImage.getGraphics();
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try {
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g.drawImage(image, 0, 0, null);
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} finally {
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g.dispose();
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}
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return compatibleImage;
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}
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/**
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* <p>Returns a thumbnail of a source image. <code>newSize</code> defines
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* the length of the longest dimension of the thumbnail. The other
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* dimension is then computed according to the dimensions ratio of the
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* original picture.</p>
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* <p>This method favors speed over quality. When the new size is less than
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* half the longest dimension of the source image,
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* {@link #createThumbnail(BufferedImage, int)} or
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* {@link #createThumbnail(BufferedImage, int, int)} should be used instead
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* to ensure the quality of the result without sacrificing too much
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* performance.</p>
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*
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* @see #createThumbnailFast(java.awt.image.BufferedImage, int, int)
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* @see #createThumbnail(java.awt.image.BufferedImage, int)
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* @see #createThumbnail(java.awt.image.BufferedImage, int, int)
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* @param image the source image
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* @param newSize the length of the largest dimension of the thumbnail
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* @return a new compatible <code>BufferedImage</code> containing a
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* thumbnail of <code>image</code>
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* @throws IllegalArgumentException if <code>newSize</code> is larger than
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* the largest dimension of <code>image</code> or <= 0
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*/
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public static BufferedImage createThumbnailFast(BufferedImage image,
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int newSize) {
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float ratio;
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int width = image.getWidth();
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int height = image.getHeight();
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if (width > height) {
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if (newSize >= width) {
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throw new IllegalArgumentException("newSize must be lower than" +
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" the image width");
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} else if (newSize <= 0) {
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throw new IllegalArgumentException("newSize must" +
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" be greater than 0");
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}
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ratio = (float) width / (float) height;
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width = newSize;
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height = (int) (newSize / ratio);
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} else {
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if (newSize >= height) {
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throw new IllegalArgumentException("newSize must be lower than" +
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" the image height");
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} else if (newSize <= 0) {
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throw new IllegalArgumentException("newSize must" +
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" be greater than 0");
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}
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ratio = (float) height / (float) width;
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height = newSize;
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width = (int) (newSize / ratio);
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}
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BufferedImage temp = createCompatibleImage(image, width, height);
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Graphics2D g2 = temp.createGraphics();
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try {
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g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
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RenderingHints.VALUE_INTERPOLATION_BILINEAR);
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g2.drawImage(image, 0, 0, temp.getWidth(), temp.getHeight(), null);
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} finally {
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g2.dispose();
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}
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return temp;
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}
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/**
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* <p>Returns a thumbnail of a source image.</p>
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* <p>This method favors speed over quality. When the new size is less than
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* half the longest dimension of the source image,
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* {@link #createThumbnail(BufferedImage, int)} or
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* {@link #createThumbnail(BufferedImage, int, int)} should be used instead
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* to ensure the quality of the result without sacrificing too much
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* performance.</p>
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*
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* @see #createThumbnailFast(java.awt.image.BufferedImage, int)
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* @see #createThumbnail(java.awt.image.BufferedImage, int)
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* @see #createThumbnail(java.awt.image.BufferedImage, int, int)
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* @param image the source image
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* @param newWidth the width of the thumbnail
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* @param newHeight the height of the thumbnail
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* @return a new compatible <code>BufferedImage</code> containing a
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* thumbnail of <code>image</code>
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* @throws IllegalArgumentException if <code>newWidth</code> is larger than
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* the width of <code>image</code> or if code>newHeight</code> is larger
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* than the height of <code>image</code> or if one of the dimensions
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* is <= 0
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*/
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public static BufferedImage createThumbnailFast(BufferedImage image,
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int newWidth, int newHeight) {
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if (newWidth >= image.getWidth() ||
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newHeight >= image.getHeight()) {
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throw new IllegalArgumentException("newWidth and newHeight cannot" +
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" be greater than the image" +
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" dimensions");
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} else if (newWidth <= 0 || newHeight <= 0) {
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throw new IllegalArgumentException("newWidth and newHeight must" +
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" be greater than 0");
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}
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BufferedImage temp = createCompatibleImage(image, newWidth, newHeight);
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Graphics2D g2 = temp.createGraphics();
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try {
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g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
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RenderingHints.VALUE_INTERPOLATION_BILINEAR);
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g2.drawImage(image, 0, 0, temp.getWidth(), temp.getHeight(), null);
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} finally {
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g2.dispose();
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}
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return temp;
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}
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/**
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* <p>Returns a thumbnail of a source image. <code>newSize</code> defines
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* the length of the longest dimension of the thumbnail. The other
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* dimension is then computed according to the dimensions ratio of the
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* original picture.</p>
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* <p>This method offers a good trade-off between speed and quality.
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* The result looks better than
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* {@link #createThumbnailFast(java.awt.image.BufferedImage, int)} when
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* the new size is less than half the longest dimension of the source
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* image, yet the rendering speed is almost similar.</p>
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*
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* @see #createThumbnailFast(java.awt.image.BufferedImage, int, int)
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* @see #createThumbnailFast(java.awt.image.BufferedImage, int)
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* @see #createThumbnail(java.awt.image.BufferedImage, int, int)
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* @param image the source image
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* @param newSize the length of the largest dimension of the thumbnail
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* @return a new compatible <code>BufferedImage</code> containing a
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* thumbnail of <code>image</code>
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* @throws IllegalArgumentException if <code>newSize</code> is larger than
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* the largest dimension of <code>image</code> or <= 0
|
|
*/
|
|
public static BufferedImage createThumbnail(BufferedImage image,
|
|
int newSize) {
|
|
int width = image.getWidth();
|
|
int height = image.getHeight();
|
|
|
|
boolean isTranslucent = image.getTransparency() != Transparency.OPAQUE;
|
|
boolean isWidthGreater = width > height;
|
|
|
|
if (isWidthGreater) {
|
|
if (newSize >= width) {
|
|
throw new IllegalArgumentException("newSize must be lower than" +
|
|
" the image width");
|
|
}
|
|
} else if (newSize >= height) {
|
|
throw new IllegalArgumentException("newSize must be lower than" +
|
|
" the image height");
|
|
}
|
|
|
|
if (newSize <= 0) {
|
|
throw new IllegalArgumentException("newSize must" +
|
|
" be greater than 0");
|
|
}
|
|
|
|
float ratioWH = (float) width / (float) height;
|
|
float ratioHW = (float) height / (float) width;
|
|
|
|
BufferedImage thumb = image;
|
|
BufferedImage temp = null;
|
|
|
|
Graphics2D g2 = null;
|
|
|
|
try {
|
|
int previousWidth = width;
|
|
int previousHeight = height;
|
|
|
|
do {
|
|
if (isWidthGreater) {
|
|
width /= 2;
|
|
if (width < newSize) {
|
|
width = newSize;
|
|
}
|
|
height = (int) (width / ratioWH);
|
|
} else {
|
|
height /= 2;
|
|
if (height < newSize) {
|
|
height = newSize;
|
|
}
|
|
width = (int) (height / ratioHW);
|
|
}
|
|
|
|
if (temp == null || isTranslucent) {
|
|
if (g2 != null) {
|
|
//do not need to wrap with finally
|
|
//outer finally block will ensure
|
|
//that resources are properly reclaimed
|
|
g2.dispose();
|
|
}
|
|
temp = createCompatibleImage(image, width, height);
|
|
g2 = temp.createGraphics();
|
|
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
|
|
RenderingHints.VALUE_INTERPOLATION_BILINEAR);
|
|
}
|
|
g2.drawImage(thumb, 0, 0, width, height,
|
|
0, 0, previousWidth, previousHeight, null);
|
|
|
|
previousWidth = width;
|
|
previousHeight = height;
|
|
|
|
thumb = temp;
|
|
} while (newSize != (isWidthGreater ? width : height));
|
|
} finally {
|
|
g2.dispose();
|
|
}
|
|
|
|
if (width != thumb.getWidth() || height != thumb.getHeight()) {
|
|
temp = createCompatibleImage(image, width, height);
|
|
g2 = temp.createGraphics();
|
|
|
|
try {
|
|
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
|
|
RenderingHints.VALUE_INTERPOLATION_BILINEAR);
|
|
g2.drawImage(thumb, 0, 0, width, height, 0, 0, width, height, null);
|
|
} finally {
|
|
g2.dispose();
|
|
}
|
|
|
|
thumb = temp;
|
|
}
|
|
|
|
return thumb;
|
|
}
|
|
|
|
/**
|
|
* <p>Returns a thumbnail of a source image.</p>
|
|
* <p>This method offers a good trade-off between speed and quality.
|
|
* The result looks better than
|
|
* {@link #createThumbnailFast(java.awt.image.BufferedImage, int)} when
|
|
* the new size is less than half the longest dimension of the source
|
|
* image, yet the rendering speed is almost similar.</p>
|
|
*
|
|
* @see #createThumbnailFast(java.awt.image.BufferedImage, int)
|
|
* @see #createThumbnailFast(java.awt.image.BufferedImage, int, int)
|
|
* @see #createThumbnail(java.awt.image.BufferedImage, int)
|
|
* @param image the source image
|
|
* @param newWidth the width of the thumbnail
|
|
* @param newHeight the height of the thumbnail
|
|
* @return a new compatible <code>BufferedImage</code> containing a
|
|
* thumbnail of <code>image</code>
|
|
* @throws IllegalArgumentException if <code>newWidth</code> is larger than
|
|
* the width of <code>image</code> or if code>newHeight</code> is larger
|
|
* than the height of <code>image or if one the dimensions is not > 0</code>
|
|
*/
|
|
public static BufferedImage createThumbnail(BufferedImage image,
|
|
int newWidth, int newHeight) {
|
|
int width = image.getWidth();
|
|
int height = image.getHeight();
|
|
|
|
boolean isTranslucent = image.getTransparency() != Transparency.OPAQUE;
|
|
|
|
if (newWidth >= width || newHeight >= height) {
|
|
throw new IllegalArgumentException("newWidth and newHeight cannot" +
|
|
" be greater than the image" +
|
|
" dimensions");
|
|
} else if (newWidth <= 0 || newHeight <= 0) {
|
|
throw new IllegalArgumentException("newWidth and newHeight must" +
|
|
" be greater than 0");
|
|
}
|
|
|
|
BufferedImage thumb = image;
|
|
BufferedImage temp = null;
|
|
|
|
Graphics2D g2 = null;
|
|
|
|
try {
|
|
int previousWidth = width;
|
|
int previousHeight = height;
|
|
|
|
do {
|
|
if (width > newWidth) {
|
|
width /= 2;
|
|
if (width < newWidth) {
|
|
width = newWidth;
|
|
}
|
|
}
|
|
|
|
if (height > newHeight) {
|
|
height /= 2;
|
|
if (height < newHeight) {
|
|
height = newHeight;
|
|
}
|
|
}
|
|
|
|
if (temp == null || isTranslucent) {
|
|
if (g2 != null) {
|
|
//do not need to wrap with finally
|
|
//outer finally block will ensure
|
|
//that resources are properly reclaimed
|
|
g2.dispose();
|
|
}
|
|
temp = createCompatibleImage(image, width, height);
|
|
g2 = temp.createGraphics();
|
|
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
|
|
RenderingHints.VALUE_INTERPOLATION_BILINEAR);
|
|
}
|
|
g2.drawImage(thumb, 0, 0, width, height,
|
|
0, 0, previousWidth, previousHeight, null);
|
|
|
|
previousWidth = width;
|
|
previousHeight = height;
|
|
|
|
thumb = temp;
|
|
} while (width != newWidth || height != newHeight);
|
|
} finally {
|
|
g2.dispose();
|
|
}
|
|
|
|
if (width != thumb.getWidth() || height != thumb.getHeight()) {
|
|
temp = createCompatibleImage(image, width, height);
|
|
g2 = temp.createGraphics();
|
|
|
|
try {
|
|
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
|
|
RenderingHints.VALUE_INTERPOLATION_BILINEAR);
|
|
g2.drawImage(thumb, 0, 0, width, height, 0, 0, width, height, null);
|
|
} finally {
|
|
g2.dispose();
|
|
}
|
|
|
|
thumb = temp;
|
|
}
|
|
|
|
return thumb;
|
|
}
|
|
|
|
/**
|
|
* <p>Returns an array of pixels, stored as integers, from a
|
|
* <code>BufferedImage</code>. The pixels are grabbed from a rectangular
|
|
* area defined by a location and two dimensions. Calling this method on
|
|
* an image of type different from <code>BufferedImage.TYPE_INT_ARGB</code>
|
|
* and <code>BufferedImage.TYPE_INT_RGB</code> will unmanage the image.</p>
|
|
*
|
|
* @param img the source image
|
|
* @param x the x location at which to start grabbing pixels
|
|
* @param y the y location at which to start grabbing pixels
|
|
* @param w the width of the rectangle of pixels to grab
|
|
* @param h the height of the rectangle of pixels to grab
|
|
* @param pixels a pre-allocated array of pixels of size w*h; can be null
|
|
* @return <code>pixels</code> if non-null, a new array of integers
|
|
* otherwise
|
|
* @throws IllegalArgumentException is <code>pixels</code> is non-null and
|
|
* of length < w*h
|
|
*/
|
|
public static int[] getPixels(BufferedImage img,
|
|
int x, int y, int w, int h, int[] pixels) {
|
|
if (w == 0 || h == 0) {
|
|
return new int[0];
|
|
}
|
|
|
|
if (pixels == null) {
|
|
pixels = new int[w * h];
|
|
} else if (pixels.length < w * h) {
|
|
throw new IllegalArgumentException("pixels array must have a length" +
|
|
" >= w*h");
|
|
}
|
|
|
|
int imageType = img.getType();
|
|
if (imageType == BufferedImage.TYPE_INT_ARGB ||
|
|
imageType == BufferedImage.TYPE_INT_RGB) {
|
|
Raster raster = img.getRaster();
|
|
return (int[]) raster.getDataElements(x, y, w, h, pixels);
|
|
}
|
|
|
|
// Unmanages the image
|
|
return img.getRGB(x, y, w, h, pixels, 0, w);
|
|
}
|
|
|
|
/**
|
|
* <p>Writes a rectangular area of pixels in the destination
|
|
* <code>BufferedImage</code>. Calling this method on
|
|
* an image of type different from <code>BufferedImage.TYPE_INT_ARGB</code>
|
|
* and <code>BufferedImage.TYPE_INT_RGB</code> will unmanage the image.</p>
|
|
*
|
|
* @param img the destination image
|
|
* @param x the x location at which to start storing pixels
|
|
* @param y the y location at which to start storing pixels
|
|
* @param w the width of the rectangle of pixels to store
|
|
* @param h the height of the rectangle of pixels to store
|
|
* @param pixels an array of pixels, stored as integers
|
|
* @throws IllegalArgumentException is <code>pixels</code> is non-null and
|
|
* of length < w*h
|
|
*/
|
|
public static void setPixels(BufferedImage img,
|
|
int x, int y, int w, int h, int[] pixels) {
|
|
if (pixels == null || w == 0 || h == 0) {
|
|
return;
|
|
} else if (pixels.length < w * h) {
|
|
throw new IllegalArgumentException("pixels array must have a length" +
|
|
" >= w*h");
|
|
}
|
|
|
|
int imageType = img.getType();
|
|
if (imageType == BufferedImage.TYPE_INT_ARGB ||
|
|
imageType == BufferedImage.TYPE_INT_RGB) {
|
|
WritableRaster raster = img.getRaster();
|
|
raster.setDataElements(x, y, w, h, pixels);
|
|
} else {
|
|
// Unmanages the image
|
|
img.setRGB(x, y, w, h, pixels, 0, w);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Sets the clip on a graphics object by merging a supplied clip with the
|
|
* existing one. The new clip will be an intersection of the old clip and
|
|
* the supplied clip. The old clip shape will be returned. This is useful
|
|
* for resetting the old clip after an operation is performed.
|
|
*
|
|
* @param g
|
|
* the graphics object to update
|
|
* @param clip
|
|
* a new clipping region to add to the graphics clip. This may
|
|
* return {@code null} if the current clip is {@code null}.
|
|
* @return the current clipping region of the supplied graphics object
|
|
* @throws NullPointerException
|
|
* if any parameter is {@code null}
|
|
*/
|
|
public static Shape mergeClip(Graphics g, Shape clip) {
|
|
Shape oldClip = g.getClip();
|
|
if(oldClip == null) {
|
|
g.setClip(clip);
|
|
return null;
|
|
}
|
|
Area area = new Area(oldClip);
|
|
area.intersect(new Area(clip));//new Rectangle(0,0,width,height)));
|
|
g.setClip(area);
|
|
return oldClip;
|
|
}
|
|
} |