| /* |
| * 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. |
| */ |
| 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); |
| } |
| } |
| |
| } |