- /*
- * @(#)SOSMarkerSegment.java 1.6 03/12/19
- *
- * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
- * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
- */
-
- 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.
- */
- 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.
- */
- 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.
- */
- 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);
- }
- }
-
- }