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1
7
8 package com.sun.imageio.plugins.jpeg;
9
10 import javax.imageio.metadata.IIOInvalidTreeException  ;
12 import javax.imageio.metadata.IIOMetadataNode ;
13 import javax.imageio.stream.ImageOutputStream ;
14
15 import java.io.IOException ;
16
17 import org.w3c.dom.Node ;
18 import org.w3c.dom.NodeList ;
19 import org.w3c.dom.NamedNodeMap ;
20
21
24 class SOSMarkerSegment extends MarkerSegment {
25 int startSpectralSelection;
26 int endSpectralSelection;
27 int approxHigh;
28 int approxLow;
29 ScanComponentSpec [] componentSpecs;
31 SOSMarkerSegment(boolean willSubsample,
32 byte[] componentIDs,
33 int numComponents) {
34 super(JPEG.SOS);
35 startSpectralSelection = 0;
36 endSpectralSelection = 63;
37 approxHigh = 0;
38 approxLow = 0;
39 componentSpecs = new ScanComponentSpec[numComponents];
40 for (int i = 0; i < numComponents; i++) {
41 int tableSel = 0;
42 if (willSubsample) {
43 if ((i == 1) || (i == 2)) {
44 tableSel = 1;
45 }
46 }
47 componentSpecs[i] = new ScanComponentSpec(componentIDs[i],
48 tableSel);
49 }
50 }
51
52 SOSMarkerSegment(JPEGBuffer buffer) throws IOException {
53 super(buffer);
54 int numComponents = buffer.buf[buffer.bufPtr++];
55 componentSpecs = new ScanComponentSpec[numComponents];
56 for (int i = 0; i < numComponents; i++) {
57 componentSpecs[i] = new ScanComponentSpec(buffer);
58 }
59 startSpectralSelection = buffer.buf[buffer.bufPtr++];
60 endSpectralSelection = buffer.buf[buffer.bufPtr++];
61 approxHigh = buffer.buf[buffer.bufPtr] >> 4;
62 approxLow = buffer.buf[buffer.bufPtr++] &0xf;
63 buffer.bufAvail -= length;
64 }
65
66 SOSMarkerSegment(Node node) throws IIOInvalidTreeException {
67 super(JPEG.SOS);
68 startSpectralSelection = 0;
69 endSpectralSelection = 63;
70 approxHigh = 0;
71 approxLow = 0;
72 updateFromNativeNode(node, true);
73 }
74
75 protected Object clone () {
76 SOSMarkerSegment newGuy = (SOSMarkerSegment) super.clone();
77 if (componentSpecs != null) {
78 newGuy.componentSpecs =
79 (ScanComponentSpec []) componentSpecs.clone();
80 for (int i = 0; i < componentSpecs.length; i++) {
81 newGuy.componentSpecs[i] =
82 (ScanComponentSpec) componentSpecs[i].clone();
83 }
84 }
85 return newGuy;
86 }
87
88 IIOMetadataNode getNativeNode() {
89 IIOMetadataNode node = new IIOMetadataNode ("sos");
90 node.setAttribute("numScanComponents",
91 Integer.toString(componentSpecs.length));
92 node.setAttribute("startSpectralSelection",
93 Integer.toString(startSpectralSelection));
94 node.setAttribute("endSpectralSelection",
95 Integer.toString(endSpectralSelection));
96 node.setAttribute("approxHigh",
97 Integer.toString(approxHigh));
98 node.setAttribute("approxLow",
99 Integer.toString(approxLow));
100 for (int i = 0; i < componentSpecs.length; i++) {
101 node.appendChild(componentSpecs[i].getNativeNode());
102 }
103
104 return node;
105 }
106
107 void updateFromNativeNode(Node node, boolean fromScratch)
108 throws IIOInvalidTreeException {
109 NamedNodeMap attrs = node.getAttributes();
110 int numComponents = getAttributeValue(node, attrs, "numScanComponents",
111 1, 4, true);
112 int value = getAttributeValue(node, attrs, "startSpectralSelection",
113 0, 63, false);
114 startSpectralSelection = (value != -1) ? value : startSpectralSelection;
115 value = getAttributeValue(node, attrs, "endSpectralSelection",
116 0, 63, false);
117 endSpectralSelection = (value != -1) ? value : endSpectralSelection;
118 value = getAttributeValue(node, attrs, "approxHigh", 0, 15, false);
119 approxHigh = (value != -1) ? value : approxHigh;
120 value = getAttributeValue(node, attrs, "approxLow", 0, 15, false);
121 approxLow = (value != -1) ? value : approxLow;
122
123 NodeList children = node.getChildNodes();
125 if (children.getLength() != numComponents) {
126 throw new IIOInvalidTreeException
127 ("numScanComponents must match the number of children", node);
128 }
129 componentSpecs = new ScanComponentSpec[numComponents];
130 for (int i = 0; i < numComponents; i++) {
131 componentSpecs[i] = new ScanComponentSpec(children.item(i));
132 }
133 }
134
135
139 void write(ImageOutputStream ios) throws IOException {
140 }
142
143 void print () {
144 printTag("SOS");
145 System.out.print("Start spectral selection: ");
146 System.out.println(startSpectralSelection);
147 System.out.print("End spectral selection: ");
148 System.out.println(endSpectralSelection);
149 System.out.print("Approx high: ");
150 System.out.println(approxHigh);
151 System.out.print("Approx low: ");
152 System.out.println(approxLow);
153 System.out.print("Num scan components: ");
154 System.out.println(componentSpecs.length);
155 for (int i = 0; i< componentSpecs.length; i++) {
156 componentSpecs[i].print();
157 }
158 }
159
160 ScanComponentSpec getScanComponentSpec(byte componentSel, int tableSel) {
161 return new ScanComponentSpec(componentSel, tableSel);
162 }
163
164
167 class ScanComponentSpec implements Cloneable {
168 int componentSelector;
169 int dcHuffTable;
170 int acHuffTable;
171
172 ScanComponentSpec(byte componentSel, int tableSel) {
173 componentSelector = componentSel;
174 dcHuffTable = tableSel;
175 acHuffTable = tableSel;
176 }
177
178 ScanComponentSpec(JPEGBuffer buffer) {
179 componentSelector = buffer.buf[buffer.bufPtr++];
181 dcHuffTable = buffer.buf[buffer.bufPtr] >> 4;
182 acHuffTable = buffer.buf[buffer.bufPtr++] & 0xf;
183 }
184
185 ScanComponentSpec(Node node) throws IIOInvalidTreeException {
186 NamedNodeMap attrs = node.getAttributes();
187 componentSelector = getAttributeValue(node, attrs, "componentSelector",
188 0, 255, true);
189 dcHuffTable = getAttributeValue(node, attrs, "dcHuffTable",
190 0, 3, true);
191 acHuffTable = getAttributeValue(node, attrs, "acHuffTable",
192 0, 3, true);
193 }
194
195 protected Object clone() {
196 try {
197 return super.clone();
198 } catch (CloneNotSupportedException e) {} return null;
200 }
201
202 IIOMetadataNode getNativeNode() {
203 IIOMetadataNode node = new IIOMetadataNode ("scanComponentSpec");
204 node.setAttribute("componentSelector",
205 Integer.toString(componentSelector));
206 node.setAttribute("dcHuffTable",
207 Integer.toString(dcHuffTable));
208 node.setAttribute("acHuffTable",
209 Integer.toString(acHuffTable));
210 return node;
211 }
212
213 void print () {
214 System.out.print("Component Selector: ");
215 System.out.println(componentSelector);
216 System.out.print("DC huffman table: ");
217 System.out.println(dcHuffTable);
218 System.out.print("AC huffman table: ");
219 System.out.println(acHuffTable);
220 }
221 }
222
223 }
224 |
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