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 }