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1
7
8 package com.sun.imageio.plugins.gif;
9
10 import javax.imageio.ImageTypeSpecifier  ;
11 import javax.imageio.metadata.IIOMetadata ;
12 import javax.imageio.metadata.IIOMetadataNode ;
13 import javax.imageio.metadata.IIOMetadataFormat ;
14 import javax.imageio.metadata.IIOMetadataFormatImpl ;
15 import org.w3c.dom.Node ;
16
17
19
22 public class GIFStreamMetadata extends IIOMetadata {
23
24 static final String
26 nativeMetadataFormatName = "javax_imageio_gif_stream_1.0";
27
28 public static final String [] versionStrings = { "87a", "89a" };
29
30 public String version; public int logicalScreenWidth;
32 public int logicalScreenHeight;
33 public int colorResolution; public int pixelAspectRatio;
35
36 public int backgroundColorIndex; public boolean sortFlag;
39 public static final String [] colorTableSizes = {
40 "2", "4", "8", "16", "32", "64", "128", "256"
41 };
42
43 public byte[] globalColorTable = null;
45
46 public GIFStreamMetadata() {
47 super(true,
48 nativeMetadataFormatName,
49 "com.sun.imageio.plugins.gif.GIFStreamMetadataFormat",
50 null, null);
51
52 }
53
54 public boolean isReadOnly() {
55 return true;
56 }
57
58 public Node getAsTree(String formatName) {
59 if (formatName.equals(nativeMetadataFormatName)) {
60 return getNativeTree();
61 } else if (formatName.equals
62 (IIOMetadataFormatImpl.standardMetadataFormatName)) {
63 return getStandardTree();
64 } else {
65 throw new IllegalArgumentException ("Not a recognized format!");
66 }
67 }
68
69 private Node getNativeTree() {
70 IIOMetadataNode node; IIOMetadataNode root =
72 new IIOMetadataNode (nativeMetadataFormatName);
73
74 node = new IIOMetadataNode ("Version");
75 node.setAttribute("value", version);
76 root.appendChild(node);
77
78 node = new IIOMetadataNode ("LogicalScreenDescriptor");
80 node.setAttribute("logicalScreenWidth",
81 Integer.toString(logicalScreenWidth));
82 node.setAttribute("logicalScreenHeight",
83 Integer.toString(logicalScreenHeight));
84 node.setAttribute("colorResolution",
86 Integer.toString(colorResolution));
87 node.setAttribute("pixelAspectRatio",
88 Integer.toString(pixelAspectRatio));
89 root.appendChild(node);
90
91 if (globalColorTable != null) {
92 node = new IIOMetadataNode ("GlobalColorTable");
93 int numEntries = globalColorTable.length/3;
94 node.setAttribute("sizeOfGlobalColorTable",
95 Integer.toString(numEntries));
96 node.setAttribute("backgroundColorIndex",
97 Integer.toString(backgroundColorIndex));
98 node.setAttribute("sortFlag",
99 sortFlag ? "TRUE" : "FALSE");
100
101 for (int i = 0; i < numEntries; i++) {
102 IIOMetadataNode entry =
103 new IIOMetadataNode ("ColorTableEntry");
104 entry.setAttribute("index", Integer.toString(i));
105 int r = globalColorTable[3*i] & 0xff;
106 int g = globalColorTable[3*i + 1] & 0xff;
107 int b = globalColorTable[3*i + 2] & 0xff;
108 entry.setAttribute("red", Integer.toString(r));
109 entry.setAttribute("green", Integer.toString(g));
110 entry.setAttribute("blue", Integer.toString(b));
111 node.appendChild(entry);
112 }
113 root.appendChild(node);
114 }
115
116 return root;
117 }
118
119 public IIOMetadataNode getStandardChromaNode() {
120 IIOMetadataNode chroma_node = new IIOMetadataNode ("Chroma");
121 IIOMetadataNode node = null;
123 node = new IIOMetadataNode ("ColorSpaceType");
124 node.setAttribute("name", "RGB");
125 chroma_node.appendChild(node);
126
127 node = new IIOMetadataNode ("BlackIsZero");
128 node.setAttribute("value", "TRUE");
129 chroma_node.appendChild(node);
130
131
134 if (globalColorTable != null) {
135 node = new IIOMetadataNode ("Palette");
136 int numEntries = globalColorTable.length/3;
137 for (int i = 0; i < numEntries; i++) {
138 IIOMetadataNode entry =
139 new IIOMetadataNode ("PaletteEntry");
140 entry.setAttribute("index", Integer.toString(i));
141 entry.setAttribute("red",
142 Integer.toString(globalColorTable[3*i] & 0xff));
143 entry.setAttribute("green",
144 Integer.toString(globalColorTable[3*i + 1] & 0xff));
145 entry.setAttribute("blue",
146 Integer.toString(globalColorTable[3*i + 2] & 0xff));
147 node.appendChild(entry);
148 }
149 chroma_node.appendChild(node);
150
151 node = new IIOMetadataNode ("BackgroundIndex");
153 node.setAttribute("value", Integer.toString(backgroundColorIndex));
154 chroma_node.appendChild(node);
155 }
156
157 return chroma_node;
158 }
159
160 public IIOMetadataNode getStandardCompressionNode() {
161 IIOMetadataNode compression_node = new IIOMetadataNode ("Compression");
162 IIOMetadataNode node = null;
164 node = new IIOMetadataNode ("CompressionTypeName");
165 node.setAttribute("value", "lzw");
166 compression_node.appendChild(node);
167
168 node = new IIOMetadataNode ("Lossless");
169 node.setAttribute("value", "true");
170 compression_node.appendChild(node);
171
172
175 return compression_node;
176 }
177
178 public IIOMetadataNode getStandardDataNode() {
179 IIOMetadataNode data_node = new IIOMetadataNode ("Data");
180 IIOMetadataNode node = null;
182
184 node = new IIOMetadataNode ("SampleFormat");
185 node.setAttribute("value", "Index");
186 data_node.appendChild(node);
187
188 node = new IIOMetadataNode ("BitsPerSample");
189 node.setAttribute("value", Integer.toString(colorResolution));
190 data_node.appendChild(node);
191
192
195 return data_node;
196 }
197
198 public IIOMetadataNode getStandardDimensionNode() {
199 IIOMetadataNode dimension_node = new IIOMetadataNode ("Dimension");
200 IIOMetadataNode node = null;
202 node = new IIOMetadataNode ("PixelAspectRatio");
203 float aspectRatio = 1.0F;
204 if (pixelAspectRatio != 0) {
205 aspectRatio = (pixelAspectRatio + 15)/64.0F;
206 }
207 node.setAttribute("value", Float.toString(aspectRatio));
208 dimension_node.appendChild(node);
209
210 node = new IIOMetadataNode ("ImageOrientation");
211 node.setAttribute("value", "Normal");
212 dimension_node.appendChild(node);
213
214
223 node = new IIOMetadataNode ("HorizontalScreenSize");
224 node.setAttribute("value", Integer.toString(logicalScreenWidth));
225 dimension_node.appendChild(node);
226
227 node = new IIOMetadataNode ("VerticalScreenSize");
228 node.setAttribute("value", Integer.toString(logicalScreenHeight));
229 dimension_node.appendChild(node);
230
231 return dimension_node;
232 }
233
234 public IIOMetadataNode getStandardDocumentNode() {
235 IIOMetadataNode document_node = new IIOMetadataNode ("Document");
236 IIOMetadataNode node = null;
238 node = new IIOMetadataNode ("FormatVersion");
239 node.setAttribute("value", version);
240 document_node.appendChild(node);
241
242
246 return document_node;
247 }
248
249 public IIOMetadataNode getStandardTextNode() {
250 return null;
252 }
253
254 public IIOMetadataNode getStandardTransparencyNode() {
255 return null;
257 }
258
259 public void setFromTree(String formatName, Node root) {
260 throw new IllegalStateException ("Metadata is read-only!");
261 }
262
263 public void mergeTree(String formatName, Node root) {
264 throw new IllegalStateException ("Metadata is read-only!");
265 }
266
267 public void reset() {
268 throw new IllegalStateException ("Metadata is read-only!");
269 }
270 }
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