001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2008, 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 2004-2008, by Richard Atkinson and Contributors.
031 *
032 * Original Author: Richard Atkinson;
033 * Contributor(s): -;
034 *
035 * Changes
036 * -------
037 * 01-Aug-2004 : Initial version (RA);
038 * 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG);
039 *
040 */
041
042 package org.jfree.chart.encoders;
043
044 import java.awt.image.BufferedImage;
045 import java.io.IOException;
046 import java.io.OutputStream;
047
048 import com.keypoint.PngEncoder;
049
050 /**
051 * Adapter class for the Keypoint PNG Encoder. The ImageEncoderFactory will
052 * only return a reference to this class by default if the library has been
053 * compiled under a JDK < 1.4 or is being run using a JDK < 1.4.
054 */
055 public class KeypointPNGEncoderAdapter implements ImageEncoder {
056
057 /** The quality setting. */
058 private int quality = 9;
059
060 /** Encode alpha? */
061 private boolean encodingAlpha = false;
062
063 /**
064 * Get the quality of the image encoding. The underlying encoder uses int
065 * values: 0 for no compression, and values 1 through 9 for various levels
066 * of compression (1 is best speed, 9 is best compression).
067 *
068 * @return A float representing the quality.
069 */
070 public float getQuality() {
071 return this.quality;
072 }
073
074 /**
075 * Set the quality of the image encoding (supported). The underlying
076 * encoder uses int values: 0 for no compression, and values 1 through 9
077 * for various levels of compression (1 is best speed, 9 is best
078 * compression).
079 *
080 * @param quality A float representing the quality.
081 */
082 public void setQuality(float quality) {
083 this.quality = (int) quality;
084 }
085
086 /**
087 * Get whether the encoder should encode alpha transparency.
088 *
089 * @return Whether the encoder is encoding alpha transparency.
090 */
091 public boolean isEncodingAlpha() {
092 return this.encodingAlpha;
093 }
094
095 /**
096 * Set whether the encoder should encode alpha transparency (supported).
097 *
098 * @param encodingAlpha Whether the encoder should encode alpha
099 * transparency.
100 */
101 public void setEncodingAlpha(boolean encodingAlpha) {
102 this.encodingAlpha = encodingAlpha;
103 }
104
105 /**
106 * Encodes an image in PNG format.
107 *
108 * @param bufferedImage The image to be encoded.
109 * @return The byte[] that is the encoded image.
110 * @throws IOException
111 */
112 public byte[] encode(BufferedImage bufferedImage) throws IOException {
113 if (bufferedImage == null) {
114 throw new IllegalArgumentException("Null 'image' argument.");
115 }
116 PngEncoder encoder = new PngEncoder(bufferedImage, this.encodingAlpha,
117 0, this.quality);
118 return encoder.pngEncode();
119 }
120
121 /**
122 * Encodes an image in PNG format and writes it to an
123 * <code>OutputStream</code>.
124 *
125 * @param bufferedImage The image to be encoded.
126 * @param outputStream The OutputStream to write the encoded image to.
127 * @throws IOException
128 */
129 public void encode(BufferedImage bufferedImage, OutputStream outputStream)
130 throws IOException {
131 if (bufferedImage == null) {
132 throw new IllegalArgumentException("Null 'image' argument.");
133 }
134 if (outputStream == null) {
135 throw new IllegalArgumentException("Null 'outputStream' argument.");
136 }
137 PngEncoder encoder = new PngEncoder(bufferedImage, this.encodingAlpha,
138 0, this.quality);
139 outputStream.write(encoder.pngEncode());
140 }
141
142 }