001: /* ===========================================================
002: * JFreeChart : a free chart library for the Java(tm) platform
003: * ===========================================================
004: *
005: * (C) Copyright 2000-2006, by Object Refinery Limited and Contributors.
006: *
007: * Project Info: http://www.jfree.org/jfreechart/index.html
008: *
009: * This library is free software; you can redistribute it and/or modify it
010: * under the terms of the GNU Lesser General Public License as published by
011: * the Free Software Foundation; either version 2.1 of the License, or
012: * (at your option) any later version.
013: *
014: * This library is distributed in the hope that it will be useful, but
015: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
016: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
017: * License for more details.
018: *
019: * You should have received a copy of the GNU Lesser General Public
020: * License along with this library; if not, write to the Free Software
021: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
022: * USA.
023: *
024: * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
025: * in the United States and other countries.]
026: *
027: * --------------------------
028: * SunJPEGEncoderAdapter.java
029: * --------------------------
030: * (C) Copyright 2004-2006, by Richard Atkinson and Contributors.
031: *
032: * Original Author: Richard Atkinson;
033: * Contributor(s): David Gilbert (for Object Refinery Limited);
034: *
035: * $Id: SunJPEGEncoderAdapter.java,v 1.3.2.3 2006/07/20 14:27:00 mungady Exp $
036: *
037: * Changes
038: * -------
039: * 01-Aug-2004 : Initial version (RA);
040: * 01-Nov-2005 : To remove the dependency on non-supported APIs, use ImageIO
041: * instead of com.sun.image.codec.jpeg.JPEGImageEncoder - this
042: * adapter will only be available on JDK 1.4 or later (DG);
043: * ------------- JFREECHART 1.0.0 ---------------------------------------------
044: * 20-Jul-2006 : Pass quality setting to ImageIO. Also increased default
045: * value to 0.95 (DG);
046: *
047: */
048:
049: package org.jfree.chart.encoders;
050:
051: import java.awt.image.BufferedImage;
052: import java.io.ByteArrayOutputStream;
053: import java.io.IOException;
054: import java.io.OutputStream;
055: import java.util.Iterator;
056:
057: import javax.imageio.IIOImage;
058: import javax.imageio.ImageIO;
059: import javax.imageio.ImageWriteParam;
060: import javax.imageio.ImageWriter;
061: import javax.imageio.stream.ImageOutputStream;
062:
063: /**
064: * Adapter class for the Sun JPEG Encoder. The {@link ImageEncoderFactory}
065: * will only return a reference to this class by default if the library has
066: * been compiled under a JDK 1.4+ and is being run using a JRE 1.4+.
067: */
068: public class SunJPEGEncoderAdapter implements ImageEncoder {
069:
070: /** The quality setting (in the range 0.0f to 1.0f). */
071: private float quality = 0.95f;
072:
073: /**
074: * Creates a new <code>SunJPEGEncoderAdapter</code> instance.
075: */
076: public SunJPEGEncoderAdapter() {
077: }
078:
079: /**
080: * Returns the quality of the image encoding, which is a number in the
081: * range 0.0f to 1.0f (higher values give better quality output, but larger
082: * file sizes). The default value is 0.95f.
083: *
084: * @return A float representing the quality, in the range 0.0f to 1.0f.
085: *
086: * @see #setQuality(float)
087: */
088: public float getQuality() {
089: return this .quality;
090: }
091:
092: /**
093: * Set the quality of the image encoding.
094: *
095: * @param quality A float representing the quality (in the range 0.0f to
096: * 1.0f).
097: *
098: * @see #getQuality()
099: */
100: public void setQuality(float quality) {
101: if (quality < 0.0f || quality > 1.0f) {
102: throw new IllegalArgumentException(
103: "The 'quality' must be in the range 0.0f to 1.0f");
104: }
105: this .quality = quality;
106: }
107:
108: /**
109: * Returns <code>false</code> always, indicating that this encoder does not
110: * encode alpha transparency.
111: *
112: * @return <code>false</code>.
113: */
114: public boolean isEncodingAlpha() {
115: return false;
116: }
117:
118: /**
119: * Set whether the encoder should encode alpha transparency (this is not
120: * supported for JPEG, so this method does nothing).
121: *
122: * @param encodingAlpha ignored.
123: */
124: public void setEncodingAlpha(boolean encodingAlpha) {
125: // No op
126: }
127:
128: /**
129: * Encodes an image in JPEG format.
130: *
131: * @param bufferedImage the image to be encoded (<code>null</code> not
132: * permitted).
133: *
134: * @return The byte[] that is the encoded image.
135: *
136: * @throws IOException if there is an I/O problem.
137: * @throws NullPointerException if <code>bufferedImage</code> is
138: * <code>null</code>.
139: */
140: public byte[] encode(BufferedImage bufferedImage)
141: throws IOException {
142: ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
143: encode(bufferedImage, outputStream);
144: return outputStream.toByteArray();
145: }
146:
147: /**
148: * Encodes an image in JPEG format and writes it to an output stream.
149: *
150: * @param bufferedImage the image to be encoded (<code>null</code> not
151: * permitted).
152: * @param outputStream the OutputStream to write the encoded image to
153: * (<code>null</code> not permitted).
154: *
155: * @throws IOException if there is an I/O problem.
156: * @throws NullPointerException if <code>bufferedImage</code> is
157: * <code>null</code>.
158: */
159: public void encode(BufferedImage bufferedImage,
160: OutputStream outputStream) throws IOException {
161: if (bufferedImage == null) {
162: throw new IllegalArgumentException("Null 'image' argument.");
163: }
164: if (outputStream == null) {
165: throw new IllegalArgumentException(
166: "Null 'outputStream' argument.");
167: }
168: Iterator iterator = ImageIO.getImageWritersByFormatName("jpeg");
169: ImageWriter writer = (ImageWriter) iterator.next();
170: ImageWriteParam p = writer.getDefaultWriteParam();
171: p.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
172: p.setCompressionQuality(this .quality);
173: ImageOutputStream ios = ImageIO
174: .createImageOutputStream(outputStream);
175: writer.setOutput(ios);
176: writer.write(null, new IIOImage(bufferedImage, null, null), p);
177: ios.flush();
178: writer.dispose();
179: ios.close();
180: }
181:
182: }
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