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1
7
8 package com.sun.imageio.plugins.gif;
9
10 import java.io.UnsupportedEncodingException  ;
11 import java.util.ArrayList ;
12 import java.util.Iterator ;
13 import java.util.List ;
14 import javax.imageio.ImageTypeSpecifier ;
15 import javax.imageio.metadata.IIOMetadata ;
16 import javax.imageio.metadata.IIOMetadataNode ;
17 import javax.imageio.metadata.IIOMetadataFormat ;
18 import javax.imageio.metadata.IIOMetadataFormatImpl ;
19 import org.w3c.dom.Node ;
20
21
24 public class GIFImageMetadata extends IIOMetadata {
25
26 static final String
28 nativeMetadataFormatName = "javax_imageio_gif_image_1.0";
29
30 static final String [] disposalMethodNames = {
31 "none",
32 "doNotDispose",
33 "restoreToBackgroundColor",
34 "restoreToPrevious",
35 "undefinedDisposalMethod4",
36 "undefinedDisposalMethod5",
37 "undefinedDisposalMethod6",
38 "undefinedDisposalMethod7"
39 };
40
41 public int imageLeftPosition;
43 public int imageTopPosition;
44 public int imageWidth;
45 public int imageHeight;
46 public boolean interlaceFlag = false;
47 public boolean sortFlag = false;
48 public byte[] localColorTable = null;
49
50 public int disposalMethod = 0;
52 public boolean userInputFlag = false;
53 public boolean transparentColorFlag = false;
54 public int delayTime = 0;
55 public int transparentColorIndex = 0;
56
57 public boolean hasPlainTextExtension = false;
59 public int textGridLeft;
60 public int textGridTop;
61 public int textGridWidth;
62 public int textGridHeight;
63 public int characterCellWidth;
64 public int characterCellHeight;
65 public int textForegroundColor;
66 public int textBackgroundColor;
67 public byte[] text;
68
69 public List applicationIDs = null;
73 public List authenticationCodes = null;
76 public List applicationData = null;
79 public List comments = null;
83 public GIFImageMetadata() {
84 super(true,
85 nativeMetadataFormatName,
86 "com.sun.imageio.plugins.gif.GIFImageMetadataFormat",
87 null, null);
88 }
89
90 public boolean isReadOnly() {
91 return true;
92 }
93
94 public Node getAsTree(String formatName) {
95 if (formatName.equals(nativeMetadataFormatName)) {
96 return getNativeTree();
97 } else if (formatName.equals
98 (IIOMetadataFormatImpl.standardMetadataFormatName)) {
99 return getStandardTree();
100 } else {
101 throw new IllegalArgumentException ("Not a recognized format!");
102 }
103 }
104
105 private String toISO8859(byte[] data) {
106 try {
107 return new String (data, "ISO-8859-1");
108 } catch (UnsupportedEncodingException e) {
109 return "";
110 }
111 }
112
113 private Node getNativeTree() {
114 IIOMetadataNode node; IIOMetadataNode root =
116 new IIOMetadataNode (nativeMetadataFormatName);
117
118 node = new IIOMetadataNode ("ImageDescriptor");
120 node.setAttribute("imageLeftPosition",
121 Integer.toString(imageLeftPosition));
122 node.setAttribute("imageTopPosition",
123 Integer.toString(imageTopPosition));
124 node.setAttribute("imageWidth", Integer.toString(imageWidth));
125 node.setAttribute("imageHeight", Integer.toString(imageHeight));
126 node.setAttribute("interlaceFlag",
127 interlaceFlag ? "true" : "false");
128 root.appendChild(node);
129
130 if (localColorTable != null) {
132 node = new IIOMetadataNode ("LocalColorTable");
133 int numEntries = localColorTable.length/3;
134 node.setAttribute("sizeOfLocalColorTable",
135 Integer.toString(numEntries));
136 node.setAttribute("sortFlag",
137 sortFlag ? "TRUE" : "FALSE");
138
139 for (int i = 0; i < numEntries; i++) {
140 IIOMetadataNode entry =
141 new IIOMetadataNode ("ColorTableEntry");
142 entry.setAttribute("index", Integer.toString(i));
143 int r = localColorTable[3*i] & 0xff;
144 int g = localColorTable[3*i + 1] & 0xff;
145 int b = localColorTable[3*i + 2] & 0xff;
146 entry.setAttribute("red", Integer.toString(r));
147 entry.setAttribute("green", Integer.toString(g));
148 entry.setAttribute("blue", Integer.toString(b));
149 node.appendChild(entry);
150 }
151 root.appendChild(node);
152 }
153
154 node = new IIOMetadataNode ("GraphicControlExtension");
156 node.setAttribute("disposalMethod",
157 disposalMethodNames[disposalMethod]);
158 node.setAttribute("userInputFlag",
159 userInputFlag ? "true" : "false");
160 node.setAttribute("transparentColorFlag",
161 transparentColorFlag ? "true" : "false");
162 node.setAttribute("delayTime",
163 Integer.toString(delayTime));
164 node.setAttribute("transparentColorIndex",
165 Integer.toString(transparentColorIndex));
166 root.appendChild(node);
167
168 if (hasPlainTextExtension) {
169 node = new IIOMetadataNode ("PlainTextExtension");
170 node.setAttribute("textGridLeft",
171 Integer.toString(textGridLeft));
172 node.setAttribute("textGridTop",
173 Integer.toString(textGridTop));
174 node.setAttribute("textGridWidth",
175 Integer.toString(textGridWidth));
176 node.setAttribute("textGridHeight",
177 Integer.toString(textGridHeight));
178 node.setAttribute("characterCellWidth",
179 Integer.toString(characterCellWidth));
180 node.setAttribute("characterCellHeight",
181 Integer.toString(characterCellHeight));
182 node.setAttribute("textForegroundColor",
183 Integer.toString(textForegroundColor));
184 node.setAttribute("textBackgroundColor",
185 Integer.toString(textBackgroundColor));
186 node.setAttribute("text", toISO8859(text));
187
188 root.appendChild(node);
189 }
190
191 int numAppExtensions = applicationIDs == null ?
193 0 : applicationIDs.size();
194 if (numAppExtensions > 0) {
195 node = new IIOMetadataNode ("ApplicationExtensions");
196 for (int i = 0; i < numAppExtensions; i++) {
197 IIOMetadataNode appExtNode =
198 new IIOMetadataNode ("ApplicationExtension");
199 byte[] applicationID = (byte[])applicationIDs.get(i);
200 appExtNode.setAttribute("applicationID",
201 toISO8859(applicationID));
202 byte[] authenticationCode = (byte[])authenticationCodes.get(i);
203 appExtNode.setAttribute("authenticationCode",
204 toISO8859(authenticationCode));
205 byte[] appData = (byte[])applicationData.get(i);
206 appExtNode.setUserObject((byte[])appData.clone());
207 node.appendChild(appExtNode);
208 }
209
210 root.appendChild(node);
211 }
212
213 int numComments = comments == null ? 0 : comments.size();
215 if (numComments > 0) {
216 node = new IIOMetadataNode ("CommentExtensions");
217 for (int i = 0; i < numComments; i++) {
218 IIOMetadataNode commentNode =
219 new IIOMetadataNode ("CommentExtension");
220 byte[] comment = (byte[])comments.get(i);
221 commentNode.setAttribute("value", toISO8859(comment));
222 node.appendChild(commentNode);
223 }
224
225 root.appendChild(node);
226 }
227
228 return root;
229 }
230
231 public IIOMetadataNode getStandardChromaNode() {
232 IIOMetadataNode chroma_node = new IIOMetadataNode ("Chroma");
233 IIOMetadataNode node = null;
235 node = new IIOMetadataNode ("ColorSpaceType");
236 node.setAttribute("name", "RGB");
237 chroma_node.appendChild(node);
238
239 node = new IIOMetadataNode ("NumChannels");
240 node.setAttribute("value", transparentColorFlag ? "4" : "3");
241 chroma_node.appendChild(node);
242
243
245 node = new IIOMetadataNode ("BlackIsZero");
246 node.setAttribute("value", "TRUE");
247 chroma_node.appendChild(node);
248
249 if (localColorTable != null) {
250 node = new IIOMetadataNode ("Palette");
251 int numEntries = localColorTable.length/3;
252 for (int i = 0; i < numEntries; i++) {
253 IIOMetadataNode entry =
254 new IIOMetadataNode ("PaletteEntry");
255 entry.setAttribute("index", Integer.toString(i));
256 entry.setAttribute("red",
257 Integer.toString(localColorTable[3*i] & 0xff));
258 entry.setAttribute("green",
259 Integer.toString(localColorTable[3*i + 1] & 0xff));
260 entry.setAttribute("blue",
261 Integer.toString(localColorTable[3*i + 2] & 0xff));
262 node.appendChild(entry);
263 }
264 chroma_node.appendChild(node);
265 }
266
267
270 return chroma_node;
271 }
272
273 public IIOMetadataNode getStandardCompressionNode() {
274 IIOMetadataNode compression_node = new IIOMetadataNode ("Compression");
275 IIOMetadataNode node = null;
277 node = new IIOMetadataNode ("CompressionTypeName");
278 node.setAttribute("value", "lzw");
279 compression_node.appendChild(node);
280
281 node = new IIOMetadataNode ("Lossless");
282 node.setAttribute("value", "TRUE");
283 compression_node.appendChild(node);
284
285 node = new IIOMetadataNode ("NumProgressiveScans");
286 node.setAttribute("value", interlaceFlag ? "4" : "1");
287 compression_node.appendChild(node);
288
289
291 return compression_node;
292 }
293
294 public IIOMetadataNode getStandardDataNode() {
295 IIOMetadataNode data_node = new IIOMetadataNode ("Data");
296 IIOMetadataNode node = null;
298
300 node = new IIOMetadataNode ("SampleFormat");
301 node.setAttribute("value", "Index");
302 data_node.appendChild(node);
303
304
308 return data_node;
309 }
310
311 public IIOMetadataNode getStandardDimensionNode() {
312 IIOMetadataNode dimension_node = new IIOMetadataNode ("Dimension");
313 IIOMetadataNode node = null;
315
317 node = new IIOMetadataNode ("ImageOrientation");
318 node.setAttribute("value", "Normal");
319 dimension_node.appendChild(node);
320
321
328 node = new IIOMetadataNode ("HorizontalPixelOffset");
329 node.setAttribute("value", Integer.toString(imageLeftPosition));
330 dimension_node.appendChild(node);
331
332 node = new IIOMetadataNode ("VerticalPixelOffset");
333 node.setAttribute("value", Integer.toString(imageTopPosition));
334 dimension_node.appendChild(node);
335
336
339 return dimension_node;
340 }
341
342
344 public IIOMetadataNode getStandardTextNode() {
345 if (comments == null) {
346 return null;
347 }
348 Iterator commentIter = comments.iterator();
349 if (!commentIter.hasNext()) {
350 return null;
351 }
352
353 IIOMetadataNode text_node = new IIOMetadataNode ("Text");
354 IIOMetadataNode node = null;
356 while (commentIter.hasNext()) {
357 byte[] comment = (byte[])commentIter.next();
358 String s = null;
359 try {
360 s = new String (comment, "ISO-8859-1");
361 } catch (UnsupportedEncodingException e) {
362 throw new RuntimeException ("Encoding ISO-8859-1 unknown!");
363 }
364
365 node = new IIOMetadataNode ("TextEntry");
366 node.setAttribute("value", s);
367 node.setAttribute("encoding", "ISO-8859-1");
368 node.setAttribute("compression", "none");
369 text_node.appendChild(node);
370 }
371
372 return text_node;
373 }
374
375 public IIOMetadataNode getStandardTransparencyNode() {
376 if (!transparentColorFlag) {
377 return null;
378 }
379
380 IIOMetadataNode transparency_node =
381 new IIOMetadataNode ("Transparency");
382 IIOMetadataNode node = null;
384
386 node = new IIOMetadataNode ("TransparentIndex");
387 node.setAttribute("value",
388 Integer.toString(transparentColorIndex));
389 transparency_node.appendChild(node);
390
391
395 return transparency_node;
396 }
397
398 public void setFromTree(String formatName, Node root) {
399 throw new IllegalStateException ("Metadata is read-only!");
400 }
401
402 public void mergeTree(String formatName, Node root) {
403 throw new IllegalStateException ("Metadata is read-only!");
404 }
405
406 public void reset() {
407 throw new IllegalStateException ("Metadata is read-only!");
408 }
409 }
410 |
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