1 /*
2 * Copyright (c) 2001, 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 =
97 (ScanComponentSpec []) componentSpecs.clone();
98 for (int i = 0; i < componentSpecs.length; i++) {
99 newGuy.componentSpecs[i] =
100 (ScanComponentSpec) componentSpecs[i].clone();
101 }
102 }
103 return newGuy;
104 }
105
106 IIOMetadataNode getNativeNode() {
107 IIOMetadataNode node = new IIOMetadataNode("sos");
108 node.setAttribute("numScanComponents",
109 Integer.toString(componentSpecs.length));
110 node.setAttribute("startSpectralSelection",
111 Integer.toString(startSpectralSelection));
112 node.setAttribute("endSpectralSelection",
113 Integer.toString(endSpectralSelection));
114 node.setAttribute("approxHigh",
115 Integer.toString(approxHigh));
116 node.setAttribute("approxLow",
117 Integer.toString(approxLow));
118 for (int i = 0; i < componentSpecs.length; i++) {
119 node.appendChild(componentSpecs[i].getNativeNode());
120 }
121
122 return node;
123 }
124
125 void updateFromNativeNode(Node node, boolean fromScratch)
126 throws IIOInvalidTreeException {
127 NamedNodeMap attrs = node.getAttributes();
128 int numComponents = getAttributeValue(node, attrs, "numScanComponents",
129 1, 4, true);
130 int value = getAttributeValue(node, attrs, "startSpectralSelection",
131 0, 63, false);
132 startSpectralSelection = (value != -1) ? value : startSpectralSelection;
133 value = getAttributeValue(node, attrs, "endSpectralSelection",
134 0, 63, false);
135 endSpectralSelection = (value != -1) ? value : endSpectralSelection;
136 value = getAttributeValue(node, attrs, "approxHigh", 0, 15, false);
137 approxHigh = (value != -1) ? value : approxHigh;
138 value = getAttributeValue(node, attrs, "approxLow", 0, 15, false);
139 approxLow = (value != -1) ? value : approxLow;
140
141 // Now the children
142 NodeList children = node.getChildNodes();
143 if (children.getLength() != numComponents) {
144 throw new IIOInvalidTreeException
145 ("numScanComponents must match the number of children", node);
146 }
147 componentSpecs = new ScanComponentSpec[numComponents];
148 for (int i = 0; i < numComponents; i++) {
149 componentSpecs[i] = new ScanComponentSpec(children.item(i));
150 }
151 }
152
153 /**
154 * Writes the data for this segment to the stream in
155 * valid JPEG format.
156 */
157 void write(ImageOutputStream ios) throws IOException {
158 // We don't write SOS segments; the IJG library does.
159 }
160
161 void print () {
162 printTag("SOS");
163 System.out.print("Start spectral selection: ");
164 System.out.println(startSpectralSelection);
165 System.out.print("End spectral selection: ");
166 System.out.println(endSpectralSelection);
167 System.out.print("Approx high: ");
168 System.out.println(approxHigh);
169 System.out.print("Approx low: ");
170 System.out.println(approxLow);
171 System.out.print("Num scan components: ");
172 System.out.println(componentSpecs.length);
173 for (int i = 0; i< componentSpecs.length; i++) {
174 componentSpecs[i].print();
175 }
176 }
177
178 ScanComponentSpec getScanComponentSpec(byte componentSel, int tableSel) {
179 return new ScanComponentSpec(componentSel, tableSel);
180 }
181
182 /**
183 * A scan component spec within an SOS marker segment.
184 */
185 class ScanComponentSpec implements Cloneable {
186 int componentSelector;
187 int dcHuffTable;
188 int acHuffTable;
189
190 ScanComponentSpec(byte componentSel, int tableSel) {
191 componentSelector = componentSel;
192 dcHuffTable = tableSel;
193 acHuffTable = tableSel;
194 }
195
196 ScanComponentSpec(JPEGBuffer buffer) {
197 // Parent already loaded the buffer
198 componentSelector = buffer.buf[buffer.bufPtr++];
199 dcHuffTable = buffer.buf[buffer.bufPtr] >> 4;
200 acHuffTable = buffer.buf[buffer.bufPtr++] & 0xf;
201 }
202
203 ScanComponentSpec(Node node) throws IIOInvalidTreeException {
204 NamedNodeMap attrs = node.getAttributes();
205 componentSelector = getAttributeValue(node, attrs, "componentSelector",
206 0, 255, true);
207 dcHuffTable = getAttributeValue(node, attrs, "dcHuffTable",
208 0, 3, true);
209 acHuffTable = getAttributeValue(node, attrs, "acHuffTable",
210 0, 3, true);
211 }
212
213 protected Object clone() {
214 try {
215 return super.clone();
216 } catch (CloneNotSupportedException e) {} // won't happen
217 return null;
218 }
219
220 IIOMetadataNode getNativeNode() {
221 IIOMetadataNode node = new IIOMetadataNode("scanComponentSpec");
222 node.setAttribute("componentSelector",
223 Integer.toString(componentSelector));
224 node.setAttribute("dcHuffTable",
225 Integer.toString(dcHuffTable));
226 node.setAttribute("acHuffTable",
227 Integer.toString(acHuffTable));
228 return node;
229 }
230
231 void print () {
232 System.out.print("Component Selector: ");
233 System.out.println(componentSelector);
234 System.out.print("DC huffman table: ");
235 System.out.println(dcHuffTable);
236 System.out.print("AC huffman table: ");
237 System.out.println(acHuffTable);
238 }
239 }
240
241 }