001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2007, 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 * KeypointPNGEncoderAdapter.java
029 * ------------------------------
030 * (C) Copyright 2004, 2007, by Richard Atkinson and Contributors.
031 *
032 * Original Author: Richard Atkinson;
033 * Contributor(s): -;
034 *
035 * $Id: KeypointPNGEncoderAdapter.java,v 1.4.2.3 2007/02/02 14:51:22 mungady Exp $
036 *
037 * Changes
038 * -------
039 * 01-Aug-2004 : Initial version (RA);
040 * 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG);
041 *
042 */
043
044 package org.jfree.chart.encoders;
045
046 import com.keypoint.PngEncoder;
047
048 import java.awt.image.BufferedImage;
049 import java.io.IOException;
050 import java.io.OutputStream;
051
052 /**
053 * Adapter class for the Keypoint PNG Encoder. The ImageEncoderFactory will
054 * only return a reference to this class by default if the library has been
055 * compiled under a JDK < 1.4 or is being run using a JDK < 1.4.
056 */
057 public class KeypointPNGEncoderAdapter implements ImageEncoder {
058 private int quality = 9;
059 private boolean encodingAlpha = false;
060
061 /**
062 * Get the quality of the image encoding. The underlying encoder uses int
063 * values: 0 for no compression, and values 1 through 9 for various levels
064 * of compression (1 is best speed, 9 is best compression).
065 *
066 * @return A float representing the quality.
067 */
068 public float getQuality() {
069 return this.quality;
070 }
071
072 /**
073 * Set the quality of the image encoding (supported). The underlying
074 * encoder uses int values: 0 for no compression, and values 1 through 9
075 * for various levels of compression (1 is best speed, 9 is best
076 * compression).
077 *
078 * @param quality A float representing the quality.
079 */
080 public void setQuality(float quality) {
081 this.quality = (int) quality;
082 }
083
084 /**
085 * Get whether the encoder should encode alpha transparency.
086 *
087 * @return Whether the encoder is encoding alpha transparency.
088 */
089 public boolean isEncodingAlpha() {
090 return this.encodingAlpha;
091 }
092
093 /**
094 * Set whether the encoder should encode alpha transparency (supported).
095 *
096 * @param encodingAlpha Whether the encoder should encode alpha
097 * transparency.
098 */
099 public void setEncodingAlpha(boolean encodingAlpha) {
100 this.encodingAlpha = encodingAlpha;
101 }
102
103 /**
104 * Encodes an image in PNG format.
105 *
106 * @param bufferedImage The image to be encoded.
107 * @return The byte[] that is the encoded image.
108 * @throws IOException
109 */
110 public byte[] encode(BufferedImage bufferedImage) throws IOException {
111 if (bufferedImage == null) {
112 throw new IllegalArgumentException("Null 'image' argument.");
113 }
114 PngEncoder encoder = new PngEncoder(bufferedImage, this.encodingAlpha,
115 0, this.quality);
116 return encoder.pngEncode();
117 }
118
119 /**
120 * Encodes an image in PNG format and writes it to an
121 * <code>OutputStream</code>.
122 *
123 * @param bufferedImage The image to be encoded.
124 * @param outputStream The OutputStream to write the encoded image to.
125 * @throws IOException
126 */
127 public void encode(BufferedImage bufferedImage, OutputStream outputStream)
128 throws IOException {
129 if (bufferedImage == null) {
130 throw new IllegalArgumentException("Null 'image' argument.");
131 }
132 if (outputStream == null) {
133 throw new IllegalArgumentException("Null 'outputStream' argument.");
134 }
135 PngEncoder encoder = new PngEncoder(bufferedImage, this.encodingAlpha,
136 0, this.quality);
137 outputStream.write(encoder.pngEncode());
138 }
139
140 }