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JPEG2000 support for Java Advanced Imaging Image I/O Tools API core.
This module is licensed under the [JJ2000 license](LICENSE.txt) and
is therefore NOT compatible with the GPL 3 license. It should be
compatible with the LGPL 2.1 license.
/*
* $RCSfile: ChannelDefinitionBox.java,v $
*
*
* Copyright (c) 2005 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any
* kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
* WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
* EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
* NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
* USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
* ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
* CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
* REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
* INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for
* use in the design, construction, operation or maintenance of any
* nuclear facility.
*
* $Revision: 1.1 $
* $Date: 2005/02/11 05:01:31 $
* $State: Exp $
*/
package com.github.jaiimageio.jpeg2000.impl;
import java.awt.image.ColorModel;
import javax.imageio.metadata.IIOInvalidTreeException;
import javax.imageio.metadata.IIOMetadataNode;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/** This class is designed to represent a Channel Definition Box of
* JPEG JP2 file format. A Channel Definition Box has a length, and
* a fixed type of "cdef". Its content defines the type of the image
* channels: color channel, alpha channel or premultiplied alpha channel.
*/
public class ChannelDefinitionBox extends Box {
/** The cached data elements. */
private short num;
private short[] channels;
private short[] types;
private short[] associations;
/** Computes the length of this box from the provided
* ColorModel.
*/
private static int computeLength(ColorModel colorModel) {
int length = colorModel.getComponentSize().length - 1;
return 10 +
(colorModel.isAlphaPremultiplied() ? length * 18 : length * 12);
}
/** Fills the channel definitions into the arrays based on the number
* of components and isPremultiplied.
*/
public static void fillBasedOnBands(int numComps,
boolean isPremultiplied,
short[] c,
short[] t,
short[] a) {
int num = numComps * (isPremultiplied ? 3 : 2);
if (isPremultiplied) {
for (int i = numComps * 2; i < num; i++) {
c[i] = (short)(i - numComps * 2);
t[i] = 2; // 2 -- premultiplied
a[i] = (short)(i + 1 - numComps * 2);
}
}
for (int i = 0; i < numComps; i++) {
int j = i + numComps;
c[i] = (short)i;
t[i] = 0; // The original channel
a[j] = a[i] = (short)(i + 1);
c[j] = (short)numComps;
t[j] = 1; // 1 -- transparency
}
}
/** Constructs a ChannelDefinitionBox based on the provided
* ColorModel.
*/
public ChannelDefinitionBox(ColorModel colorModel) {
super(computeLength(colorModel), 0x63646566, null);
// creates the buffers for the channel definitions.
short length = (short)(colorModel.getComponentSize().length - 1);
num = (short)(length * (colorModel.isAlphaPremultiplied() ? 3 : 2));
channels = new short[num];
types = new short[num];
associations = new short[num];
// fills the arrays.
fillBasedOnBands(length,
colorModel.isAlphaPremultiplied(),
channels,
types,
associations);
}
/** Constructs a ChannelDefinitionBox based on the provided
* content in byte array.
*/
public ChannelDefinitionBox(byte[] data) {
super(8 + data.length, 0x63646566, data);
}
/** Constructs a ChannelDefinitionBox based on the provided
* channel definitions.
*/
public ChannelDefinitionBox(short[] channel, short[] types,
short[] associations) {
super(10 + channel.length * 6, 0x63646566, null);
this.num = (short)channel.length;
this.channels = channel;
this.types = types;
this.associations = associations;
}
/** Constructs a ChannelDefinitionBox based on the provided
* org.w3c.dom.Node.
*/
public ChannelDefinitionBox(Node node) throws IIOInvalidTreeException {
super(node);
NodeList children = node.getChildNodes();
int index = 0;
for (int i = 0; i < children.getLength(); i++) {
Node child = children.item(i);
String name = child.getNodeName();
if ("NumberOfDefinition".equals(name)) {
num = Box.getShortElementValue(child);
}
if ("Definitions".equals(name)) {
channels = new short[num];
types = new short[num];
associations = new short[num];
NodeList children1 = child.getChildNodes();
for (int j = 0; j < children1.getLength(); j++) {
child = children1.item(j);
name = child.getNodeName();
if ("ChannelNumber".equals(name)) {
channels[index] = Box.getShortElementValue(child);
}
if ("ChannelType".equals(name)) {
types[index] = Box.getShortElementValue(child);
}
if ("Association".equals(name)) {
associations[index++] = Box.getShortElementValue(child);
}
}
}
}
}
/** Parse the channel definitions from the content data array. */
protected void parse(byte[] data) {
num = (short)((data[0] << 8) | data[1]);
channels = new short[num];
types = new short[num];
associations = new short[num];
for (int i = 0, j = 2; i < num; i++) {
channels[i] =
(short)(((data[j++] & 0xFF) << 8) + (data[j++] & 0xFF));
types[i] = (short)(((data[j++] & 0xFF) << 8) + (data[j++] & 0xFF));
associations[i] =
(short)(((data[j++] & 0xFF) << 8) + (data[j++] & 0xFF));
}
}
/** Returns the defined channels. */
public short[] getChannel() {
return channels;
}
/** Returns the channel types. */
public short[] getTypes() {
return types;
}
/** Returns the association which associates a color channel to a color
* component in the color space of the image.
*/
public short[] getAssociation() {
return associations;
}
/** Creates an IIOMetadataNode from this channel definition
* box. The format of this node is defined in the XML dtd and xsd
* for the JP2 image file.
*/
public IIOMetadataNode getNativeNode() {
IIOMetadataNode node = new IIOMetadataNode(Box.getName(getType()));
setDefaultAttributes(node);
IIOMetadataNode child = new IIOMetadataNode("NumberOfDefinition");
child.setUserObject(new Short(num));
child.setNodeValue("" + num);
node.appendChild(child);
child = new IIOMetadataNode("Definitions");
node.appendChild(child);
for (int i = 0; i < num; i++) {
IIOMetadataNode child1 = new IIOMetadataNode("ChannelNumber");
child1.setUserObject(new Short(channels[i]));
child1.setNodeValue("" + channels[i]);
child.appendChild(child1);
child1 = new IIOMetadataNode("ChannelType");
child1.setUserObject(new Short(types[i]));
child1.setNodeValue("" + types[i]);
child.appendChild(child1);
child1 = new IIOMetadataNode("Association");
child1.setUserObject(new Short(associations[i]));
child1.setNodeValue("" + associations[i]);
child.appendChild(child1);
}
return node;
}
protected void compose() {
if (data != null)
return;
int len = num * 6 + 2;
data = new byte[len];
data[0] = (byte)(num >> 8);
data[1] = (byte)(num & 0xFF);
for (int i = 0, j = 2; i < num; i++) {
data[j++] = (byte)(channels[i] >> 8);
data[j++] = (byte)(channels[i] & 0xFF);
data[j++] = (byte)(types[i] >> 8);
data[j++] = (byte)(types[i] & 0xFF);
data[j++] = (byte)(associations[i] >> 8);
data[j++] = (byte)(associations[i] & 0xFF);
}
}
}