001: /*
002: * $RCSfile: ResolutionBox.java,v $
003: *
004: *
005: * Copyright (c) 2005 Sun Microsystems, Inc. All Rights Reserved.
006: *
007: * Redistribution and use in source and binary forms, with or without
008: * modification, are permitted provided that the following conditions
009: * are met:
010: *
011: * - Redistribution of source code must retain the above copyright
012: * notice, this list of conditions and the following disclaimer.
013: *
014: * - Redistribution in binary form must reproduce the above copyright
015: * notice, this list of conditions and the following disclaimer in
016: * the documentation and/or other materials provided with the
017: * distribution.
018: *
019: * Neither the name of Sun Microsystems, Inc. or the names of
020: * contributors may be used to endorse or promote products derived
021: * from this software without specific prior written permission.
022: *
023: * This software is provided "AS IS," without a warranty of any
024: * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
025: * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
026: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
027: * EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
028: * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
029: * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
030: * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
031: * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
032: * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
033: * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
034: * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
035: * POSSIBILITY OF SUCH DAMAGES.
036: *
037: * You acknowledge that this software is not designed or intended for
038: * use in the design, construction, operation or maintenance of any
039: * nuclear facility.
040: *
041: * $Revision: 1.1 $
042: * $Date: 2005/02/11 05:01:37 $
043: * $State: Exp $
044: */
045: package com.sun.media.imageioimpl.plugins.jpeg2000;
046:
047: import javax.imageio.metadata.IIOInvalidTreeException;
048: import javax.imageio.metadata.IIOMetadataNode;
049: import org.w3c.dom.Node;
050: import org.w3c.dom.NodeList;
051:
052: /** This class is defined to represent a Resolution Box of JPEG JP2
053: * file format. A Data Entry URL Box has a length, and a fixed type
054: * of "resc" (capture resolution) or "resd" (default display resolution).
055: *
056: * Its contens includes the resolution numerators, denominator, and the
057: * exponents for both horizontal and vertical directions.
058: */
059: public class ResolutionBox extends Box {
060: /** The data elements in this box. */
061: private short numV;
062: private short numH;
063: private short denomV;
064: private short denomH;
065: private byte expV;
066: private byte expH;
067:
068: /** The cached horizontal/vertical resolutions. */
069: private float hRes;
070: private float vRes;
071:
072: /** Constructs a <code>ResolutionBox</code> from the provided type and
073: * content data array.
074: */
075: public ResolutionBox(int type, byte[] data) {
076: super (18, type, data);
077: }
078:
079: /** Constructs a <code>ResolutionBox</code> from the provided type and
080: * horizontal/vertical resolutions.
081: */
082: public ResolutionBox(int type, float hRes, float vRes) {
083: super (18, type, null);
084: this .hRes = hRes;
085: this .vRes = vRes;
086: denomH = denomV = 1;
087:
088: expV = 0;
089: if (vRes >= 32768) {
090: int temp = (int) vRes;
091: while (temp >= 32768) {
092: expV++;
093: temp /= 10;
094: }
095: numV = (short) (temp & 0xFFFF);
096: } else {
097: numV = (short) vRes;
098: }
099:
100: expH = 0;
101: if (hRes >= 32768) {
102: int temp = (int) hRes;
103: while (temp >= 32768) {
104: expH++;
105: temp /= 10;
106: }
107: numH = (short) (temp & 0xFFFF);
108: } else {
109: numH = (short) hRes;
110: }
111: }
112:
113: /** Constructs a <code>ResolutionBox</code> based on the provided
114: * <code>org.w3c.dom.Node</code>.
115: */
116: public ResolutionBox(Node node) throws IIOInvalidTreeException {
117: super (node);
118: NodeList children = node.getChildNodes();
119: for (int i = 0; i < children.getLength(); i++) {
120: Node child = children.item(i);
121: String name = child.getNodeName();
122:
123: if ("VerticalResolutionNumerator".equals(name)) {
124: numV = Box.getShortElementValue(child);
125: }
126:
127: if ("VerticalResolutionDenominator".equals(name)) {
128: denomV = Box.getShortElementValue(child);
129: }
130:
131: if ("HorizontalResolutionNumerator".equals(name)) {
132: numH = Box.getShortElementValue(child);
133: }
134:
135: if ("HorizontalResolutionDenominator".equals(name)) {
136: denomH = Box.getShortElementValue(child);
137: }
138:
139: if ("VerticalResolutionExponent".equals(name)) {
140: expV = Box.getByteElementValue(child);
141: }
142:
143: if ("HorizontalResolutionExponent".equals(name)) {
144: expH = Box.getByteElementValue(child);
145: }
146: }
147: }
148:
149: /** Return the horizontal resolution. */
150: public float getHorizontalResolution() {
151: return hRes;
152: }
153:
154: /** Return the vertical resolution. */
155: public float getVerticalResolution() {
156: return vRes;
157: }
158:
159: /** Parse the data elements from the provided content data array. */
160: protected void parse(byte[] data) {
161: numV = (short) (((data[0] & 0xFF) << 8) | (data[1] & 0xFF));
162: denomV = (short) (((data[2] & 0xFF) << 8) | (data[3] & 0xFF));
163: numH = (short) (((data[4] & 0xFF) << 8) | (data[5] & 0xFF));
164: denomH = (short) (((data[6] & 0xFF) << 8) | (data[7] & 0xFF));
165: expV = data[8];
166: expH = data[9];
167: vRes = (float) ((numV & 0xFFFF) * Math.pow(10, expV) / (denomV & 0xFFFF));
168: hRes = (float) ((numH & 0xFFFF) * Math.pow(10, expH) / (denomH & 0xFFFF));
169: }
170:
171: /** Creates an <code>IIOMetadataNode</code> from this resolution
172: * box. The format of this node is defined in the XML dtd and xsd
173: * for the JP2 image file.
174: */
175: public IIOMetadataNode getNativeNode() {
176: IIOMetadataNode node = new IIOMetadataNode(Box
177: .getName(getType()));
178: setDefaultAttributes(node);
179:
180: IIOMetadataNode child = new IIOMetadataNode(
181: "VerticalResolutionNumerator");
182: child.setUserObject(new Short(numV));
183: child.setNodeValue("" + numV);
184: node.appendChild(child);
185:
186: child = new IIOMetadataNode("VerticalResolutionDenominator");
187: child.setUserObject(new Short(denomV));
188: child.setNodeValue("" + denomV);
189: node.appendChild(child);
190:
191: child = new IIOMetadataNode("HorizontalResolutionNumerator");
192: child.setUserObject(new Short(numH));
193: child.setNodeValue("" + numH);
194: node.appendChild(child);
195:
196: child = new IIOMetadataNode("HorizontalResolutionDenominator");
197: child.setUserObject(new Short(denomH));
198: child.setNodeValue("" + denomH);
199: node.appendChild(child);
200:
201: child = new IIOMetadataNode("VerticalResolutionExponent");
202: child.setUserObject(new Byte(expV));
203: child.setNodeValue("" + expV);
204: node.appendChild(child);
205:
206: child = new IIOMetadataNode("HorizontalResolutionExponent");
207: child.setUserObject(new Byte(expH));
208: child.setNodeValue("" + expH);
209: node.appendChild(child);
210:
211: return node;
212: }
213:
214: protected void compose() {
215: if (data != null)
216: return;
217: data = new byte[10];
218: data[0] = (byte) (numV >> 8);
219: data[1] = (byte) (numV & 0xFF);
220: data[2] = (byte) (denomV >> 8);
221: data[3] = (byte) (denomV & 0xFF);
222:
223: data[4] = (byte) (numH >> 8);
224: data[5] = (byte) (numH & 0xFF);
225: data[6] = (byte) (denomH >> 8);
226: data[7] = (byte) (denomH & 0xFF);
227:
228: data[8] = expV;
229: data[9] = expH;
230: }
231: }
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