1 /*
2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.imageio.plugins.jpeg;
27
28 //import javax.imageio.IIOException;
29 import javax.imageio.metadata.IIOInvalidTreeException;
30 import javax.imageio.metadata.IIOMetadataNode;
31 import javax.imageio.stream.ImageOutputStream;
32
33 import java.io.IOException;
34
35 import org.w3c.dom.Node;
36 import org.w3c.dom.NodeList;
37 import org.w3c.dom.NamedNodeMap;
38
39 /**
40 * An SOS (Start Of Scan) marker segment.
41 */
42 class SOSMarkerSegment extends MarkerSegment {
43 int startSpectralSelection;
44 int endSpectralSelection;
45 int approxHigh;
46 int approxLow;
47 ScanComponentSpec [] componentSpecs; // Array size is numScanComponents
48
49 SOSMarkerSegment(boolean willSubsample,
50 byte[] componentIDs,
51 int numComponents) {
52 super(JPEG.SOS);
53 startSpectralSelection = 0;
54 endSpectralSelection = 63;
55 approxHigh = 0;
56 approxLow = 0;
57 componentSpecs = new ScanComponentSpec[numComponents];
58 for (int i = 0; i < numComponents; i++) {
59 int tableSel = 0;
60 if (willSubsample) {
61 if ((i == 1) || (i == 2)) {
62 tableSel = 1;
63 }
64 }
65 componentSpecs[i] = new ScanComponentSpec(componentIDs[i],
66 tableSel);
67 }
68 }
69
70 SOSMarkerSegment(JPEGBuffer buffer) throws IOException {
71 super(buffer);
72 int numComponents = buffer.buf[buffer.bufPtr++];
73 componentSpecs = new ScanComponentSpec[numComponents];
74 for (int i = 0; i < numComponents; i++) {
75 componentSpecs[i] = new ScanComponentSpec(buffer);
76 }
77 startSpectralSelection = buffer.buf[buffer.bufPtr++];
78 endSpectralSelection = buffer.buf[buffer.bufPtr++];
79 approxHigh = buffer.buf[buffer.bufPtr] >> 4;
80 approxLow = buffer.buf[buffer.bufPtr++] &0xf;
81 buffer.bufAvail -= length;
82 }
83
84 SOSMarkerSegment(Node node) throws IIOInvalidTreeException {
85 super(JPEG.SOS);
86 startSpectralSelection = 0;
87 endSpectralSelection = 63;
88 approxHigh = 0;
89 approxLow = 0;
90 updateFromNativeNode(node, true);
91 }
92
93 protected Object clone () {
94 SOSMarkerSegment newGuy = (SOSMarkerSegment) super.clone();
95 if (componentSpecs != null) {
96 newGuy.componentSpecs = componentSpecs.clone();
97 for (int i = 0; i < componentSpecs.length; i++) {
98 newGuy.componentSpecs[i] =
99 (ScanComponentSpec) componentSpecs[i].clone();
100 }
101 }
102 return newGuy;
103 }
104
105 IIOMetadataNode getNativeNode() {
106 IIOMetadataNode node = new IIOMetadataNode("sos");
107 node.setAttribute("numScanComponents",
108 Integer.toString(componentSpecs.length));
109 node.setAttribute("startSpectralSelection",
110 Integer.toString(startSpectralSelection));
111 node.setAttribute("endSpectralSelection",
112 Integer.toString(endSpectralSelection));
113 node.setAttribute("approxHigh",
114 Integer.toString(approxHigh));
115 node.setAttribute("approxLow",
116 Integer.toString(approxLow));
117 for (int i = 0; i < componentSpecs.length; i++) {
118 node.appendChild(componentSpecs[i].getNativeNode());
119 }
120
121 return node;
122 }
123
124 void updateFromNativeNode(Node node, boolean fromScratch)
125 throws IIOInvalidTreeException {
126 NamedNodeMap attrs = node.getAttributes();
127 int numComponents = getAttributeValue(node, attrs, "numScanComponents",
128 1, 4, true);
129 int value = getAttributeValue(node, attrs, "startSpectralSelection",
130 0, 63, false);
131 startSpectralSelection = (value != -1) ? value : startSpectralSelection;
132 value = getAttributeValue(node, attrs, "endSpectralSelection",
133 0, 63, false);
134 endSpectralSelection = (value != -1) ? value : endSpectralSelection;
135 value = getAttributeValue(node, attrs, "approxHigh", 0, 15, false);
136 approxHigh = (value != -1) ? value : approxHigh;
137 value = getAttributeValue(node, attrs, "approxLow", 0, 15, false);
138 approxLow = (value != -1) ? value : approxLow;
139
140 // Now the children
141 NodeList children = node.getChildNodes();
142 if (children.getLength() != numComponents) {
143 throw new IIOInvalidTreeException
144 ("numScanComponents must match the number of children", node);
145 }
146 componentSpecs = new ScanComponentSpec[numComponents];
147 for (int i = 0; i < numComponents; i++) {
148 componentSpecs[i] = new ScanComponentSpec(children.item(i));
149 }
150 }
151
152 /**
153 * Writes the data for this segment to the stream in
154 * valid JPEG format.
155 */
156 void write(ImageOutputStream ios) throws IOException {
157 // We don't write SOS segments; the IJG library does.
158 }
159
160 void print () {
161 printTag("SOS");
162 System.out.print("Start spectral selection: ");
163 System.out.println(startSpectralSelection);
164 System.out.print("End spectral selection: ");
165 System.out.println(endSpectralSelection);
166 System.out.print("Approx high: ");
167 System.out.println(approxHigh);
168 System.out.print("Approx low: ");
169 System.out.println(approxLow);
170 System.out.print("Num scan components: ");
171 System.out.println(componentSpecs.length);
172 for (int i = 0; i< componentSpecs.length; i++) {
173 componentSpecs[i].print();
174 }
175 }
176
177 ScanComponentSpec getScanComponentSpec(byte componentSel, int tableSel) {
178 return new ScanComponentSpec(componentSel, tableSel);
179 }
180
181 /**
182 * A scan component spec within an SOS marker segment.
183 */
184 class ScanComponentSpec implements Cloneable {
185 int componentSelector;
186 int dcHuffTable;
187 int acHuffTable;
188
189 ScanComponentSpec(byte componentSel, int tableSel) {
190 componentSelector = componentSel;
191 dcHuffTable = tableSel;
192 acHuffTable = tableSel;
193 }
194
195 ScanComponentSpec(JPEGBuffer buffer) {
196 // Parent already loaded the buffer
197 componentSelector = buffer.buf[buffer.bufPtr++];
198 dcHuffTable = buffer.buf[buffer.bufPtr] >> 4;
199 acHuffTable = buffer.buf[buffer.bufPtr++] & 0xf;
200 }
201
202 ScanComponentSpec(Node node) throws IIOInvalidTreeException {
203 NamedNodeMap attrs = node.getAttributes();
204 componentSelector = getAttributeValue(node, attrs, "componentSelector",
205 0, 255, true);
206 dcHuffTable = getAttributeValue(node, attrs, "dcHuffTable",
207 0, 3, true);
208 acHuffTable = getAttributeValue(node, attrs, "acHuffTable",
209 0, 3, true);
210 }
211
212 protected Object clone() {
213 try {
214 return super.clone();
215 } catch (CloneNotSupportedException e) {} // won't happen
216 return null;
217 }
218
219 IIOMetadataNode getNativeNode() {
220 IIOMetadataNode node = new IIOMetadataNode("scanComponentSpec");
221 node.setAttribute("componentSelector",
222 Integer.toString(componentSelector));
223 node.setAttribute("dcHuffTable",
224 Integer.toString(dcHuffTable));
225 node.setAttribute("acHuffTable",
226 Integer.toString(acHuffTable));
227 return node;
228 }
229
230 void print () {
231 System.out.print("Component Selector: ");
232 System.out.println(componentSelector);
233 System.out.print("DC huffman table: ");
234 System.out.println(dcHuffTable);
235 System.out.print("AC huffman table: ");
236 System.out.println(acHuffTable);
237 }
238 }
239
240 }