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Java > Open Source Codes > nextapp > echo2 > webcontainer > image > ImageToBufferedImage


1 /*
2  * This file is part of the Echo Web Application Framework (hereinafter "Echo").
3  * Copyright (C) 2002-2005 NextApp, Inc.
4  *
5  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
6  *
7  * The contents of this file are subject to the Mozilla Public License Version
8  * 1.1 (the "License"); you may not use this file except in compliance with
9  * the License. You may obtain a copy of the License at
10  * http://www.mozilla.org/MPL/
11  *
12  * Software distributed under the License is distributed on an "AS IS" basis,
13  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14  * for the specific language governing rights and limitations under the
15  * License.
16  *
17  * Alternatively, the contents of this file may be used under the terms of
18  * either the GNU General Public License Version 2 or later (the "GPL"), or
19  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
20  * in which case the provisions of the GPL or the LGPL are applicable instead
21  * of those above. If you wish to allow use of your version of this file only
22  * under the terms of either the GPL or the LGPL, and not to allow others to
23  * use your version of this file under the terms of the MPL, indicate your
24  * decision by deleting the provisions above and replace them with the notice
25  * and other provisions required by the GPL or the LGPL. If you do not delete
26  * the provisions above, a recipient may use your version of this file under
27  * the terms of any one of the MPL, the GPL or the LGPL.
28  */
29
30 package nextapp.echo2.webcontainer.image;
31
32 import java.awt.Graphics JavaDoc;
33 import java.awt.Image JavaDoc;
34 import java.awt.image.PixelGrabber JavaDoc;
35 import java.awt.image.BufferedImage JavaDoc;
36
37 import javax.swing.ImageIcon JavaDoc;
38
39 class ImageToBufferedImage {
40
41     static BufferedImage JavaDoc toBufferedImage(Image JavaDoc image) {
42         if (image instanceof BufferedImage JavaDoc) {
43             // Return image unchanged if it is already a BufferedImage.
44 return (BufferedImage JavaDoc) image;
45         }
46         
47         // Ensure image is loaded.
48 image = new ImageIcon JavaDoc(image).getImage();
49         
50         int type = hasAlpha(image) ? BufferedImage.TYPE_INT_RGB : BufferedImage.TYPE_INT_ARGB;
51         BufferedImage JavaDoc bufferedImage = new BufferedImage JavaDoc(image.getWidth(null), image.getHeight(null), type);
52         Graphics JavaDoc g = bufferedImage.createGraphics();
53         g.drawImage(image, 0, 0, null);
54         g.dispose();
55         
56         return bufferedImage;
57     }
58     
59     static boolean hasAlpha(Image JavaDoc image) {
60         PixelGrabber JavaDoc pg = new PixelGrabber JavaDoc(image, 0, 0, 1, 1, false);
61         try {
62             pg.grabPixels();
63         } catch (InterruptedException JavaDoc ex) { }
64         return pg.getColorModel().hasAlpha();
65     }
66
67     /**
68      * Non-instantiable class.
69      */
70     private ImageToBufferedImage() { }
71 }
72
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