/*
 * Copyright (c) 2001, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.imageio.plugins.jpeg;

//import javax.imageio.IIOException;
import javax.imageio.metadata.IIOInvalidTreeException;
import javax.imageio.metadata.IIOMetadataNode;
import javax.imageio.stream.ImageOutputStream;

import java.io.IOException;

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.NamedNodeMap;

An SOS (Start Of Scan) marker segment.
/** * An SOS (Start Of Scan) marker segment. */
class SOSMarkerSegment extends MarkerSegment { int startSpectralSelection; int endSpectralSelection; int approxHigh; int approxLow; ScanComponentSpec [] componentSpecs; // Array size is numScanComponents SOSMarkerSegment(boolean willSubsample, byte[] componentIDs, int numComponents) { super(JPEG.SOS); startSpectralSelection = 0; endSpectralSelection = 63; approxHigh = 0; approxLow = 0; componentSpecs = new ScanComponentSpec[numComponents]; for (int i = 0; i < numComponents; i++) { int tableSel = 0; if (willSubsample) { if ((i == 1) || (i == 2)) { tableSel = 1; } } componentSpecs[i] = new ScanComponentSpec(componentIDs[i], tableSel); } } SOSMarkerSegment(JPEGBuffer buffer) throws IOException { super(buffer); int numComponents = buffer.buf[buffer.bufPtr++]; componentSpecs = new ScanComponentSpec[numComponents]; for (int i = 0; i < numComponents; i++) { componentSpecs[i] = new ScanComponentSpec(buffer); } startSpectralSelection = buffer.buf[buffer.bufPtr++]; endSpectralSelection = buffer.buf[buffer.bufPtr++]; approxHigh = buffer.buf[buffer.bufPtr] >> 4; approxLow = buffer.buf[buffer.bufPtr++] &0xf; buffer.bufAvail -= length; } SOSMarkerSegment(Node node) throws IIOInvalidTreeException { super(JPEG.SOS); startSpectralSelection = 0; endSpectralSelection = 63; approxHigh = 0; approxLow = 0; updateFromNativeNode(node, true); } protected Object clone () { SOSMarkerSegment newGuy = (SOSMarkerSegment) super.clone(); if (componentSpecs != null) { newGuy.componentSpecs = (ScanComponentSpec []) componentSpecs.clone(); for (int i = 0; i < componentSpecs.length; i++) { newGuy.componentSpecs[i] = (ScanComponentSpec) componentSpecs[i].clone(); } } return newGuy; } IIOMetadataNode getNativeNode() { IIOMetadataNode node = new IIOMetadataNode("sos"); node.setAttribute("numScanComponents", Integer.toString(componentSpecs.length)); node.setAttribute("startSpectralSelection", Integer.toString(startSpectralSelection)); node.setAttribute("endSpectralSelection", Integer.toString(endSpectralSelection)); node.setAttribute("approxHigh", Integer.toString(approxHigh)); node.setAttribute("approxLow", Integer.toString(approxLow)); for (int i = 0; i < componentSpecs.length; i++) { node.appendChild(componentSpecs[i].getNativeNode()); } return node; } void updateFromNativeNode(Node node, boolean fromScratch) throws IIOInvalidTreeException { NamedNodeMap attrs = node.getAttributes(); int numComponents = getAttributeValue(node, attrs, "numScanComponents", 1, 4, true); int value = getAttributeValue(node, attrs, "startSpectralSelection", 0, 63, false); startSpectralSelection = (value != -1) ? value : startSpectralSelection; value = getAttributeValue(node, attrs, "endSpectralSelection", 0, 63, false); endSpectralSelection = (value != -1) ? value : endSpectralSelection; value = getAttributeValue(node, attrs, "approxHigh", 0, 15, false); approxHigh = (value != -1) ? value : approxHigh; value = getAttributeValue(node, attrs, "approxLow", 0, 15, false); approxLow = (value != -1) ? value : approxLow; // Now the children NodeList children = node.getChildNodes(); if (children.getLength() != numComponents) { throw new IIOInvalidTreeException ("numScanComponents must match the number of children", node); } componentSpecs = new ScanComponentSpec[numComponents]; for (int i = 0; i < numComponents; i++) { componentSpecs[i] = new ScanComponentSpec(children.item(i)); } }
Writes the data for this segment to the stream in valid JPEG format.
/** * Writes the data for this segment to the stream in * valid JPEG format. */
void write(ImageOutputStream ios) throws IOException { // We don't write SOS segments; the IJG library does. } void print () { printTag("SOS"); System.out.print("Start spectral selection: "); System.out.println(startSpectralSelection); System.out.print("End spectral selection: "); System.out.println(endSpectralSelection); System.out.print("Approx high: "); System.out.println(approxHigh); System.out.print("Approx low: "); System.out.println(approxLow); System.out.print("Num scan components: "); System.out.println(componentSpecs.length); for (int i = 0; i< componentSpecs.length; i++) { componentSpecs[i].print(); } } ScanComponentSpec getScanComponentSpec(byte componentSel, int tableSel) { return new ScanComponentSpec(componentSel, tableSel); }
A scan component spec within an SOS marker segment.
/** * A scan component spec within an SOS marker segment. */
class ScanComponentSpec implements Cloneable { int componentSelector; int dcHuffTable; int acHuffTable; ScanComponentSpec(byte componentSel, int tableSel) { componentSelector = componentSel; dcHuffTable = tableSel; acHuffTable = tableSel; } ScanComponentSpec(JPEGBuffer buffer) { // Parent already loaded the buffer componentSelector = buffer.buf[buffer.bufPtr++]; dcHuffTable = buffer.buf[buffer.bufPtr] >> 4; acHuffTable = buffer.buf[buffer.bufPtr++] & 0xf; } ScanComponentSpec(Node node) throws IIOInvalidTreeException { NamedNodeMap attrs = node.getAttributes(); componentSelector = getAttributeValue(node, attrs, "componentSelector", 0, 255, true); dcHuffTable = getAttributeValue(node, attrs, "dcHuffTable", 0, 3, true); acHuffTable = getAttributeValue(node, attrs, "acHuffTable", 0, 3, true); } protected Object clone() { try { return super.clone(); } catch (CloneNotSupportedException e) {} // won't happen return null; } IIOMetadataNode getNativeNode() { IIOMetadataNode node = new IIOMetadataNode("scanComponentSpec"); node.setAttribute("componentSelector", Integer.toString(componentSelector)); node.setAttribute("dcHuffTable", Integer.toString(dcHuffTable)); node.setAttribute("acHuffTable", Integer.toString(acHuffTable)); return node; } void print () { System.out.print("Component Selector: "); System.out.println(componentSelector); System.out.print("DC huffman table: "); System.out.println(dcHuffTable); System.out.print("AC huffman table: "); System.out.println(acHuffTable); } } }