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Java > Open Source Codes > net > sf > jasperreports > engine > util > JRAbstractImageEncoder


1 /*
2  * ============================================================================
3  * GNU Lesser General Public License
4  * ============================================================================
5  *
6  * JasperReports - Free Java report-generating library.
7  * Copyright (C) 2001-2006 JasperSoft Corporation http://www.jaspersoft.com
8  *
9  * This library is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
22  *
23  * JasperSoft Corporation
24  * 303 Second Street, Suite 450 North
25  * San Francisco, CA 94107
26  * http://www.jaspersoft.com
27  */
28 package net.sf.jasperreports.engine.util;
29
30 import java.awt.Graphics JavaDoc;
31 import java.awt.Image JavaDoc;
32 import java.awt.image.BufferedImage JavaDoc;
33
34 import net.sf.jasperreports.engine.JRException;
35 import net.sf.jasperreports.engine.JRRenderable;
36
37
38 /**
39  * @author Teodor Danciu (teodord@users.sourceforge.net)
40  * @version $Id: JRImageLoader.java 1229 2006-04-19 13:27:35 +0300 (Wed, 19 Apr 2006) teodord $
41  */
42 public abstract class JRAbstractImageEncoder implements JRImageEncoder
43 {
44
45     
46     /**
47      *
48      */
49     public byte[] encode(Image JavaDoc image, byte imageType) throws JRException
50     {
51         BufferedImage JavaDoc bi = null;
52         
53         if (image instanceof BufferedImage JavaDoc)
54         {
55             bi = (BufferedImage JavaDoc)image;
56         }
57         else
58         {
59             bi =
60                 new BufferedImage JavaDoc(
61                     image.getWidth(null),
62                     image.getHeight(null),
63                     // avoid creating JPEG images with transparency that would result
64 // in invalid image files for some viewers (browsers)
65 (imageType == JRRenderable.IMAGE_TYPE_GIF || imageType == JRRenderable.IMAGE_TYPE_PNG)
66                         ? BufferedImage.TYPE_INT_ARGB : BufferedImage.TYPE_INT_RGB
67                     );
68
69             Graphics JavaDoc g = bi.createGraphics();
70             g.drawImage(image, 0, 0, null);
71             g.dispose();
72         }
73
74         return encode(bi, imageType);
75     }
76
77
78     /**
79      *
80      */
81     public abstract byte[] encode(BufferedImage JavaDoc bi, byte imageType) throws JRException;
82
83
84 }
85
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