|
1
7
8 package com.sun.imageio.plugins.gif;
9
10 import java.io.UnsupportedEncodingException  ;
11 import java.nio.charset.Charset ;
12 import java.util.ArrayList ;
13 import java.util.Iterator ;
14 import java.util.List ;
15 import javax.imageio.ImageTypeSpecifier ;
16 import javax.imageio.metadata.IIOInvalidTreeException ;
17 import javax.imageio.metadata.IIOMetadata ;
18 import javax.imageio.metadata.IIOMetadataNode ;
19 import javax.imageio.metadata.IIOMetadataFormat ;
20 import javax.imageio.metadata.IIOMetadataFormatImpl ;
21 import org.w3c.dom.Node ;
22
23 class GIFWritableImageMetadata extends GIFImageMetadata {
24
25 static final String
27 NATIVE_FORMAT_NAME = "javax_imageio_gif_image_1.0";
28
29 GIFWritableImageMetadata() {
30 super(true,
31 NATIVE_FORMAT_NAME,
32 "com.sun.imageio.plugins.gif.GIFImageMetadataFormat",
33 null, null);
34 }
35
36 public boolean isReadOnly() {
37 return false;
38 }
39
40 public void reset() {
41 imageLeftPosition = 0;
43 imageTopPosition = 0;
44 imageWidth = 0;
45 imageHeight = 0;
46 interlaceFlag = false;
47 sortFlag = false;
48 localColorTable = null;
49
50 disposalMethod = 0;
52 userInputFlag = false;
53 transparentColorFlag = false;
54 delayTime = 0;
55 transparentColorIndex = 0;
56
57 hasPlainTextExtension = false;
59 textGridLeft = 0;
60 textGridTop = 0;
61 textGridWidth = 0;
62 textGridHeight = 0;
63 characterCellWidth = 0;
64 characterCellHeight = 0;
65 textForegroundColor = 0;
66 textBackgroundColor = 0;
67 text = null;
68
69 applicationIDs = null;
71 authenticationCodes = null;
72 applicationData = null;
73
74 comments = null;
77 }
78
79 private byte[] fromISO8859(String data) {
80 try {
81 return data.getBytes("ISO-8859-1");
82 } catch (UnsupportedEncodingException e) {
83 return (new String ("")).getBytes();
84 }
85 }
86
87 protected void mergeNativeTree(Node root) throws IIOInvalidTreeException {
88 Node node = root;
89 if (!node.getNodeName().equals(nativeMetadataFormatName)) {
90 fatal(node, "Root must be " + nativeMetadataFormatName);
91 }
92
93 node = node.getFirstChild();
94 while (node != null) {
95 String name = node.getNodeName();
96
97 if (name.equals("ImageDescriptor")) {
98 imageLeftPosition = getIntAttribute(node,
99 "imageLeftPosition",
100 -1, true,
101 true, 0, 65535);
102
103 imageTopPosition = getIntAttribute(node,
104 "imageTopPosition",
105 -1, true,
106 true, 0, 65535);
107
108 imageWidth = getIntAttribute(node,
109 "imageWidth",
110 -1, true,
111 true, 1, 65535);
112
113 imageHeight = getIntAttribute(node,
114 "imageHeight",
115 -1, true,
116 true, 1, 65535);
117
118 interlaceFlag = getBooleanAttribute(node, "interlaceFlag",
119 false, true);
120 } else if (name.equals("LocalColorTable")) {
121 int sizeOfLocalColorTable =
122 getIntAttribute(node, "sizeOfLocalColorTable",
123 true, 2, 256);
124 if (sizeOfLocalColorTable != 2 &&
125 sizeOfLocalColorTable != 4 &&
126 sizeOfLocalColorTable != 8 &&
127 sizeOfLocalColorTable != 16 &&
128 sizeOfLocalColorTable != 32 &&
129 sizeOfLocalColorTable != 64 &&
130 sizeOfLocalColorTable != 128 &&
131 sizeOfLocalColorTable != 256) {
132 fatal(node,
133 "Bad value for LocalColorTable attribute sizeOfLocalColorTable!");
134 }
135
136 sortFlag = getBooleanAttribute(node, "sortFlag", false, true);
137
138 localColorTable = getColorTable(node, "ColorTableEntry",
139 true, sizeOfLocalColorTable);
140 } else if (name.equals("GraphicControlExtension")) {
141 String disposalMethodName =
142 getStringAttribute(node, "disposalMethod", null,
143 true, disposalMethodNames);
144 disposalMethod = 0;
145 while(!disposalMethodName.equals(disposalMethodNames[disposalMethod])) {
146 disposalMethod++;
147 }
148
149 userInputFlag = getBooleanAttribute(node, "userInputFlag",
150 false, true);
151
152 transparentColorFlag =
153 getBooleanAttribute(node, "transparentColorFlag",
154 false, true);
155
156 delayTime = getIntAttribute(node,
157 "delayTime",
158 -1, true,
159 true, 0, 65535);
160
161 transparentColorIndex =
162 getIntAttribute(node, "transparentColorIndex",
163 -1, true,
164 true, 0, 65535);
165 } else if (name.equals("PlainTextExtension")) {
166 hasPlainTextExtension = true;
167
168 textGridLeft = getIntAttribute(node,
169 "textGridLeft",
170 -1, true,
171 true, 0, 65535);
172
173 textGridTop = getIntAttribute(node,
174 "textGridTop",
175 -1, true,
176 true, 0, 65535);
177
178 textGridWidth = getIntAttribute(node,
179 "textGridWidth",
180 -1, true,
181 true, 1, 65535);
182
183 textGridHeight = getIntAttribute(node,
184 "textGridHeight",
185 -1, true,
186 true, 1, 65535);
187
188 characterCellWidth = getIntAttribute(node,
189 "characterCellWidth",
190 -1, true,
191 true, 1, 65535);
192
193 characterCellHeight = getIntAttribute(node,
194 "characterCellHeight",
195 -1, true,
196 true, 1, 65535);
197
198 textForegroundColor = getIntAttribute(node,
199 "textForegroundColor",
200 -1, true,
201 true, 0, 255);
202
203 textBackgroundColor = getIntAttribute(node,
204 "textBackgroundColor",
205 -1, true,
206 true, 0, 255);
207
208
214 String textString =
215 getStringAttribute(node, "text", "", false, null);
216 text = fromISO8859(textString);
217 } else if (name.equals("ApplicationExtensions")) {
218 IIOMetadataNode applicationExtension =
219 (IIOMetadataNode )node.getFirstChild();
220
221 if (!applicationExtension.getNodeName().equals("ApplicationExtension")) {
222 fatal(node,
223 "Only a ApplicationExtension may be a child of a ApplicationExtensions!");
224 }
225
226 String applicationIDString =
227 getStringAttribute(applicationExtension, "applicationID",
228 null, true, null);
229
230 String authenticationCodeString =
231 getStringAttribute(applicationExtension, "authenticationCode",
232 null, true, null);
233
234 Object applicationExtensionData =
235 applicationExtension.getUserObject();
236 if (applicationExtensionData == null ||
237 !(applicationExtensionData instanceof byte[])) {
238 fatal(applicationExtension,
239 "Bad user object in ApplicationExtension!");
240 }
241
242 if (applicationIDs == null) {
243 applicationIDs = new ArrayList ();
244 authenticationCodes = new ArrayList ();
245 applicationData = new ArrayList ();
246 }
247
248 applicationIDs.add(fromISO8859(applicationIDString));
249 authenticationCodes.add(fromISO8859(authenticationCodeString));
250 applicationData.add(applicationExtensionData);
251 } else if (name.equals("CommentExtensions")) {
252 Node commentExtension = node.getFirstChild();
253 if (commentExtension != null) {
254 while(commentExtension != null) {
255 if (!commentExtension.getNodeName().equals("CommentExtension")) {
256 fatal(node,
257 "Only a CommentExtension may be a child of a CommentExtensions!");
258 }
259
260 if (comments == null) {
261 comments = new ArrayList ();
262 }
263
264 String comment =
265 getStringAttribute(commentExtension, "value", null,
266 true, null);
267
268 comments.add(fromISO8859(comment));
269
270 commentExtension = commentExtension.getNextSibling();
271 }
272 }
273 } else {
274 fatal(node, "Unknown child of root node!");
275 }
276
277 node = node.getNextSibling();
278 }
279 }
280
281 protected void mergeStandardTree(Node root)
282 throws IIOInvalidTreeException {
283 Node node = root;
284 if (!node.getNodeName()
285 .equals(IIOMetadataFormatImpl.standardMetadataFormatName)) {
286 fatal(node, "Root must be " +
287 IIOMetadataFormatImpl.standardMetadataFormatName);
288 }
289
290 node = node.getFirstChild();
291 while (node != null) {
292 String name = node.getNodeName();
293
294 if (name.equals("Chroma")) {
295 Node childNode = node.getFirstChild();
296 while(childNode != null) {
297 String childName = childNode.getNodeName();
298 if (childName.equals("Palette")) {
299 localColorTable = getColorTable(childNode,
300 "PaletteEntry",
301 false, -1);
302 break;
303 }
304 childNode = childNode.getNextSibling();
305 }
306 } else if (name.equals("Compression")) {
307 Node childNode = node.getFirstChild();
308 while(childNode != null) {
309 String childName = childNode.getNodeName();
310 if (childName.equals("NumProgressiveScans")) {
311 int numProgressiveScans =
312 getIntAttribute(childNode, "value", 4, false,
313 true, 1, Integer.MAX_VALUE);
314 if (numProgressiveScans > 1) {
315 interlaceFlag = true;
316 }
317 break;
318 }
319 childNode = childNode.getNextSibling();
320 }
321 } else if (name.equals("Dimension")) {
322 Node childNode = node.getFirstChild();
323 while(childNode != null) {
324 String childName = childNode.getNodeName();
325 if (childName.equals("HorizontalPixelOffset")) {
326 imageLeftPosition = getIntAttribute(childNode,
327 "value",
328 -1, true,
329 true, 0, 65535);
330 } else if (childName.equals("VerticalPixelOffset")) {
331 imageTopPosition = getIntAttribute(childNode,
332 "value",
333 -1, true,
334 true, 0, 65535);
335 }
336 childNode = childNode.getNextSibling();
337 }
338 } else if (name.equals("Text")) {
339 Node childNode = node.getFirstChild();
340 while(childNode != null) {
341 String childName = childNode.getNodeName();
342 if (childName.equals("TextEntry") &&
343 getAttribute(childNode, "compression",
344 "none", false).equals("none") &&
345 Charset.isSupported(getAttribute(childNode,
346 "encoding",
347 "ISO-8859-1",
348 false))) {
349 String value = getAttribute(childNode, "value");
350 byte[] comment = fromISO8859(value);
351 if (comments == null) {
352 comments = new ArrayList ();
353 }
354 comments.add(comment);
355 }
356 childNode = childNode.getNextSibling();
357 }
358 } else if (name.equals("Transparency")) {
359 Node childNode = node.getFirstChild();
360 while(childNode != null) {
361 String childName = childNode.getNodeName();
362 if (childName.equals("TransparentIndex")) {
363 transparentColorIndex = getIntAttribute(childNode,
364 "value",
365 -1, true,
366 true, 0, 255);
367 transparentColorFlag = true;
368 break;
369 }
370 childNode = childNode.getNextSibling();
371 }
372 }
373
374 node = node.getNextSibling();
375 }
376 }
377
378 public void setFromTree(String formatName, Node root)
379 throws IIOInvalidTreeException
380 {
381 reset();
382 mergeTree(formatName, root);
383 }
384 }
385 |
Popular Tags |
Java API By Example, From Geeks To Geeks. 