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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 SOFMarkerSegment extends MarkerSegment {
25 int samplePrecision;
26 int numLines;
27 int samplesPerLine;
28 ComponentSpec [] componentSpecs;
30 SOFMarkerSegment(boolean wantProg,
31 boolean wantExtended,
32 boolean willSubsample,
33 byte[] componentIDs,
34 int numComponents) {
35 super(wantProg ? JPEG.SOF2
36 : wantExtended ? JPEG.SOF1
37 : JPEG.SOF0);
38 samplePrecision = 8;
39 numLines = 0;
40 samplesPerLine = 0;
41 componentSpecs = new ComponentSpec[numComponents];
42 for(int i = 0; i < numComponents; i++) {
43 int factor = 1;
44 int qsel = 0;
45 if (willSubsample) {
46 factor = 2;
47 if ((i == 1) || (i == 2)) {
48 factor = 1;
49 qsel = 1;
50 }
51 }
52 componentSpecs[i] = new ComponentSpec(componentIDs[i], factor, qsel);
53 }
54 }
55
56 SOFMarkerSegment(JPEGBuffer buffer) throws IOException {
57 super(buffer);
58 samplePrecision = buffer.buf[buffer.bufPtr++];
59 numLines = (buffer.buf[buffer.bufPtr++] & 0xff) << 8;
60 numLines |= buffer.buf[buffer.bufPtr++] & 0xff;
61 samplesPerLine = (buffer.buf[buffer.bufPtr++] & 0xff) << 8;
62 samplesPerLine |= buffer.buf[buffer.bufPtr++] & 0xff;
63 int numComponents = buffer.buf[buffer.bufPtr++];
64 componentSpecs = new ComponentSpec [numComponents];
65 for (int i = 0; i < numComponents; i++) {
66 componentSpecs[i] = new ComponentSpec(buffer);
67 }
68 buffer.bufAvail -= length;
69 }
70
71 SOFMarkerSegment(Node node) throws IIOInvalidTreeException {
72 super(JPEG.SOF0);
74 samplePrecision = 8;
75 numLines = 0;
76 samplesPerLine = 0;
77 updateFromNativeNode(node, true);
78 }
79
80 protected Object clone() {
81 SOFMarkerSegment newGuy = (SOFMarkerSegment) super.clone();
82 if (componentSpecs != null) {
83 newGuy.componentSpecs = (ComponentSpec []) componentSpecs.clone();
84 for (int i = 0; i < componentSpecs.length; i++) {
85 newGuy.componentSpecs[i] =
86 (ComponentSpec) componentSpecs[i].clone();
87 }
88 }
89 return newGuy;
90 }
91
92 IIOMetadataNode getNativeNode() {
93 IIOMetadataNode node = new IIOMetadataNode ("sof");
94 node.setAttribute("process", Integer.toString(tag-JPEG.SOF0));
95 node.setAttribute("samplePrecision",
96 Integer.toString(samplePrecision));
97 node.setAttribute("numLines",
98 Integer.toString(numLines));
99 node.setAttribute("samplesPerLine",
100 Integer.toString(samplesPerLine));
101 node.setAttribute("numFrameComponents",
102 Integer.toString(componentSpecs.length));
103 for (int i = 0; i < componentSpecs.length; i++) {
104 node.appendChild(componentSpecs[i].getNativeNode());
105 }
106
107 return node;
108 }
109
110 void updateFromNativeNode(Node node, boolean fromScratch)
111 throws IIOInvalidTreeException {
112 NamedNodeMap attrs = node.getAttributes();
113 int value = getAttributeValue(node, attrs, "process", 0, 2, false);
114 tag = (value != -1) ? value+JPEG.SOF0 : tag;
115 value = getAttributeValue(node, attrs, "samplePrecision", 8, 8, false);
118 value = getAttributeValue(node, attrs, "numLines", 0, 65535, false);
119 numLines = (value != -1) ? value : numLines;
120 value = getAttributeValue(node, attrs, "samplesPerLine", 0, 65535, false);
121 samplesPerLine = (value != -1) ? value : samplesPerLine;
122 int numComponents = getAttributeValue(node, attrs, "numFrameComponents",
123 1, 4, false);
124 NodeList children = node.getChildNodes();
125 if (children.getLength() != numComponents) {
126 throw new IIOInvalidTreeException
127 ("numFrameComponents must match number of children", node);
128 }
129 componentSpecs = new ComponentSpec [numComponents];
130 for (int i = 0; i < numComponents; i++) {
131 componentSpecs[i] = new ComponentSpec(children.item(i));
132 }
133 }
134
135
139 void write(ImageOutputStream ios) throws IOException {
140 }
142
143 void print () {
144 printTag("SOF");
145 System.out.print("Sample precision: ");
146 System.out.println(samplePrecision);
147 System.out.print("Number of lines: ");
148 System.out.println(numLines);
149 System.out.print("Samples per line: ");
150 System.out.println(samplesPerLine);
151 System.out.print("Number of components: ");
152 System.out.println(componentSpecs.length);
153 for(int i = 0; i<componentSpecs.length; i++) {
154 componentSpecs[i].print();
155 }
156 }
157
158 int getIDencodedCSType () {
159 for (int i = 0; i < componentSpecs.length; i++) {
160 if (componentSpecs[i].componentId < 'A') {
161 return JPEG.JCS_UNKNOWN;
162 }
163 }
164 switch(componentSpecs.length) {
165 case 3:
166 if ((componentSpecs[0].componentId == 'R')
167 &&(componentSpecs[0].componentId == 'G')
168 &&(componentSpecs[0].componentId == 'B')) {
169 return JPEG.JCS_RGB;
170 }
171 if ((componentSpecs[0].componentId == 'Y')
172 &&(componentSpecs[0].componentId == 'C')
173 &&(componentSpecs[0].componentId == 'c')) {
174 return JPEG.JCS_YCC;
175 }
176 break;
177 case 4:
178 if ((componentSpecs[0].componentId == 'R')
179 &&(componentSpecs[0].componentId == 'G')
180 &&(componentSpecs[0].componentId == 'B')
181 &&(componentSpecs[0].componentId == 'A')) {
182 return JPEG.JCS_RGBA;
183 }
184 if ((componentSpecs[0].componentId == 'Y')
185 &&(componentSpecs[0].componentId == 'C')
186 &&(componentSpecs[0].componentId == 'c')
187 &&(componentSpecs[0].componentId == 'A')) {
188 return JPEG.JCS_YCCA;
189 }
190 }
191
192 return JPEG.JCS_UNKNOWN;
193 }
194
195 ComponentSpec getComponentSpec(byte id, int factor, int qSelector) {
196 return new ComponentSpec(id, factor, qSelector);
197 }
198
199
202 class ComponentSpec implements Cloneable {
203 int componentId;
204 int HsamplingFactor;
205 int VsamplingFactor;
206 int QtableSelector;
207
208 ComponentSpec(byte id, int factor, int qSelector) {
209 componentId = id;
210 HsamplingFactor = factor;
211 VsamplingFactor = factor;
212 QtableSelector = qSelector;
213 }
214
215 ComponentSpec(JPEGBuffer buffer) {
216 componentId = buffer.buf[buffer.bufPtr++];
218 HsamplingFactor = buffer.buf[buffer.bufPtr] >>> 4;
219 VsamplingFactor = buffer.buf[buffer.bufPtr++] & 0xf;
220 QtableSelector = buffer.buf[buffer.bufPtr++];
221 }
222
223 ComponentSpec(Node node) throws IIOInvalidTreeException {
224 NamedNodeMap attrs = node.getAttributes();
225 componentId = getAttributeValue(node, attrs, "componentId", 0, 255, true);
226 HsamplingFactor = getAttributeValue(node, attrs, "HsamplingFactor",
227 1, 255, true);
228 VsamplingFactor = getAttributeValue(node, attrs, "VsamplingFactor",
229 1, 255, true);
230 QtableSelector = getAttributeValue(node, attrs, "QtableSelector",
231 0, 3, true);
232 }
233
234 protected Object clone() {
235 try {
236 return super.clone();
237 } catch (CloneNotSupportedException e) {} return null;
239 }
240
241 IIOMetadataNode getNativeNode() {
242 IIOMetadataNode node = new IIOMetadataNode ("componentSpec");
243 node.setAttribute("componentId",
244 Integer.toString(componentId));
245 node.setAttribute("HsamplingFactor",
246 Integer.toString(HsamplingFactor));
247 node.setAttribute("VsamplingFactor",
248 Integer.toString(VsamplingFactor));
249 node.setAttribute("QtableSelector",
250 Integer.toString(QtableSelector));
251 return node;
252 }
253
254 void print () {
255 System.out.print("Component ID: ");
256 System.out.println(componentId);
257 System.out.print("H sampling factor: ");
258 System.out.println(HsamplingFactor);
259 System.out.print("V sampling factor: ");
260 System.out.println(VsamplingFactor);
261 System.out.print("Q table selector: ");
262 System.out.println(QtableSelector);
263 }
264 }
265
266 }
267 |
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