001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2014, 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 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
025 * Other names may be trademarks of their respective owners.]
026 *
027 * ------------------------------
028 * KeypointPNGEncoderAdapter.java
029 * ------------------------------
030 * (C) Copyright 2004-2014, 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 * 02-Jul-2013 : Use ParamChecks (DG);
040 *
041 */
042
043package org.jfree.chart.encoders;
044
045import java.awt.image.BufferedImage;
046import java.io.IOException;
047import java.io.OutputStream;
048
049import com.keypoint.PngEncoder;
050import org.jfree.chart.util.ParamChecks;
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 */
057public class KeypointPNGEncoderAdapter implements ImageEncoder {
058
059    /** The quality setting. */
060    private int quality = 9;
061
062    /** Encode alpha? */
063    private boolean encodingAlpha = false;
064
065    /**
066     * Get the quality of the image encoding.  The underlying encoder uses int
067     * values:  0 for no compression, and values 1 through 9 for various levels
068     * of compression (1 is best speed, 9 is best compression).
069     *
070     * @return A float representing the quality.
071     */
072    @Override
073    public float getQuality() {
074        return this.quality;
075    }
076
077    /**
078     * Set the quality of the image encoding (supported).  The underlying
079     * encoder uses int values:  0 for no compression, and values 1 through 9
080     * for various levels of compression (1 is best speed, 9 is best
081     * compression).
082     *
083     * @param quality  A float representing the quality.
084     */
085    @Override
086    public void setQuality(float quality) {
087        this.quality = (int) quality;
088    }
089
090    /**
091     * Get whether the encoder should encode alpha transparency.
092     *
093     * @return Whether the encoder is encoding alpha transparency.
094     */
095    @Override
096    public boolean isEncodingAlpha() {
097        return this.encodingAlpha;
098    }
099
100    /**
101     * Set whether the encoder should encode alpha transparency (supported).
102     *
103     * @param encodingAlpha  Whether the encoder should encode alpha
104     *                       transparency.
105     */
106    @Override
107    public void setEncodingAlpha(boolean encodingAlpha) {
108        this.encodingAlpha = encodingAlpha;
109    }
110
111    /**
112     * Encodes an image in PNG format.
113     *
114     * @param bufferedImage  The image to be encoded.
115     * @return The byte[] that is the encoded image.
116     * @throws IOException if there is an IO problem.
117     */
118    @Override
119    public byte[] encode(BufferedImage bufferedImage) throws IOException {
120        ParamChecks.nullNotPermitted(bufferedImage, "bufferedImage");
121        PngEncoder encoder = new PngEncoder(bufferedImage, this.encodingAlpha,
122                0, this.quality);
123        return encoder.pngEncode();
124    }
125
126    /**
127     * Encodes an image in PNG format and writes it to an
128     * <code>OutputStream</code>.
129     *
130     * @param bufferedImage  The image to be encoded.
131     * @param outputStream  The OutputStream to write the encoded image to.
132     * @throws IOException if there is an IO problem.
133     */
134    @Override
135    public void encode(BufferedImage bufferedImage, OutputStream outputStream)
136        throws IOException {
137        ParamChecks.nullNotPermitted(bufferedImage, "bufferedImage");
138        ParamChecks.nullNotPermitted(outputStream, "outputStream");
139        PngEncoder encoder = new PngEncoder(bufferedImage, this.encodingAlpha,
140                0, this.quality);
141        outputStream.write(encoder.pngEncode());
142    }
143
144}