1 /**
2 * This file Copyright (c) 2009-2016 Magnolia International
3 * Ltd. (http://www.magnolia-cms.com). All rights reserved.
4 *
5 *
6 * This file is dual-licensed under both the Magnolia
7 * Network Agreement and the GNU General Public License.
8 * You may elect to use one or the other of these licenses.
9 *
10 * This file is distributed in the hope that it will be
11 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
12 * implied warranty of MERCHANTABILITY or FITNESS FOR A
13 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
14 * Redistribution, except as permitted by whichever of the GPL
15 * or MNA you select, is prohibited.
16 *
17 * 1. For the GPL license (GPL), you can redistribute and/or
18 * modify this file under the terms of the GNU General
19 * Public License, Version 3, as published by the Free Software
20 * Foundation. You should have received a copy of the GNU
21 * General Public License, Version 3 along with this program;
22 * if not, write to the Free Software Foundation, Inc., 51
23 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
24 *
25 * 2. For the Magnolia Network Agreement (MNA), this file
26 * and the accompanying materials are made available under the
27 * terms of the MNA which accompanies this distribution, and
28 * is available at http://www.magnolia-cms.com/mna.html
29 *
30 * Any modifications to this file must keep this entire header
31 * intact.
32 *
33 */
34 package info.magnolia.imaging;
35
36 import info.magnolia.imaging.util.ImageUtil;
37
38 import java.awt.image.BufferedImage;
39 import java.io.IOException;
40 import java.io.OutputStream;
41 import java.util.Iterator;
42
43 import javax.imageio.IIOImage;
44 import javax.imageio.ImageIO;
45 import javax.imageio.ImageTypeSpecifier;
46 import javax.imageio.ImageWriteParam;
47 import javax.imageio.ImageWriter;
48 import javax.imageio.stream.ImageOutputStream;
49
50 /**
51 * An ImageStreamer implementation which always generates the image.
52 * It also knows about some of the javax.imageio quirks, so other
53 * implementations should consider subclassing or wrapping it.
54 *
55 * @param <P> type of ParameterProvider's parameter
56 */
57 public class DefaultImageStreamer<P> extends AbstractImageStreamer<P> {
58
59 @Override
60 public void serveImage(ImageGenerator<ParameterProvider<P>> generator, ParameterProvider<P> params, ImageResponse imageResponse) throws ImagingException, IOException {
61 final BufferedImage img = generator.generate(params);
62
63 final OutputFormat outputFormat = generator.getOutputFormat(params);
64 imageResponse.setMediaType(getMediaType(outputFormat));
65
66 // if source is transparent and format doesn't support transparency, we have to do some handy work
67 final BufferedImage fixedImg = ImageUtil.flattenTransparentImageForOpaqueFormat(img, outputFormat);
68
69 write(fixedImg, imageResponse.getOutputStream(), outputFormat);
70 }
71
72 protected void write(final BufferedImage img, final OutputStream out, final OutputFormat outputFormat) throws IOException {
73 // this is factored out of ImageIO.write() to allow customization of the ImageWriteParam
74 final ImageOutputStream imgOut = ImageIO.createImageOutputStream(out);
75 final ImageTypeSpecifier imgType = ImageTypeSpecifier.createFromRenderedImage(img);
76 final Iterator<ImageWriter> iter = ImageIO.getImageWriters(imgType, outputFormat.getFormatName());
77 if (!iter.hasNext()) {
78 throw new IllegalStateException("Can't find ImageWriter for " + outputFormat.getFormatName());
79 }
80 final ImageWriter imageWriter = iter.next();
81 final ImageWriteParam params = imageWriter.getDefaultWriteParam();
82
83 outputFormat.applyTo(params);
84 imageWriter.setOutput(imgOut);
85
86 imageWriter.write(null, new IIOImage(img, null, null), params);
87 imageWriter.dispose();
88 imgOut.flush();
89 imgOut.close();
90 }
91
92 }