1 /* 2 * Copyright (c) 2001, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package com.sun.imageio.plugins.jpeg; 27 28 import javax.imageio.metadata.IIOInvalidTreeException; 29 import javax.imageio.metadata.IIOMetadataNode; 30 import javax.imageio.stream.ImageOutputStream; 31 32 import java.io.IOException; 33 34 import org.w3c.dom.Node; 35 36 /** 37 * A DRI (Define Restart Interval) marker segment. 38 */ 39 class DRIMarkerSegment extends MarkerSegment { 40 /** 41 * Restart interval, or 0 if none is specified. 42 */ 43 int restartInterval = 0; 44 DRIMarkerSegment(JPEGBuffer buffer)45 DRIMarkerSegment(JPEGBuffer buffer) 46 throws IOException { 47 super(buffer); 48 restartInterval = (buffer.buf[buffer.bufPtr++] & 0xff) << 8; 49 restartInterval |= buffer.buf[buffer.bufPtr++] & 0xff; 50 buffer.bufAvail -= length; 51 } 52 DRIMarkerSegment(Node node)53 DRIMarkerSegment(Node node) throws IIOInvalidTreeException { 54 super(JPEG.DRI); 55 updateFromNativeNode(node, true); 56 } 57 getNativeNode()58 IIOMetadataNode getNativeNode() { 59 IIOMetadataNode node = new IIOMetadataNode("dri"); 60 node.setAttribute("interval", Integer.toString(restartInterval)); 61 return node; 62 } 63 updateFromNativeNode(Node node, boolean fromScratch)64 void updateFromNativeNode(Node node, boolean fromScratch) 65 throws IIOInvalidTreeException { 66 restartInterval = getAttributeValue(node, null, "interval", 67 0, 65535, true); 68 } 69 70 /** 71 * Writes the data for this segment to the stream in 72 * valid JPEG format. 73 */ write(ImageOutputStream ios)74 void write(ImageOutputStream ios) throws IOException { 75 // We don't write DRI segments; the IJG library does. 76 } 77 print()78 void print() { 79 printTag("DRI"); 80 System.out.println("Interval: " 81 + Integer.toString(restartInterval)); 82 } 83 } 84