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1
7
8 package com.sun.imageio.plugins.gif;
9
10
15
16 import javax.imageio.ImageTypeSpecifier  ;
17 import javax.imageio.metadata.IIOInvalidTreeException ;
18 import javax.imageio.metadata.IIOMetadata ;
19 import javax.imageio.metadata.IIOMetadataNode ;
20 import javax.imageio.metadata.IIOMetadataFormat ;
21 import javax.imageio.metadata.IIOMetadataFormatImpl ;
22 import org.w3c.dom.Node ;
23
24 class GIFWritableStreamMetadata extends GIFStreamMetadata {
25
26 static final String
28 NATIVE_FORMAT_NAME = "javax_imageio_gif_stream_1.0";
29
30 public GIFWritableStreamMetadata() {
31 super(true,
32 NATIVE_FORMAT_NAME,
33 "com.sun.imageio.plugins.gif.GIFStreamMetadataFormat", null, null);
35
36 reset();
38 }
39
40 public boolean isReadOnly() {
41 return false;
42 }
43
44 public void mergeTree(String formatName, Node root)
45 throws IIOInvalidTreeException {
46 if (formatName.equals(nativeMetadataFormatName)) {
47 if (root == null) {
48 throw new IllegalArgumentException ("root == null!");
49 }
50 mergeNativeTree(root);
51 } else if (formatName.equals
52 (IIOMetadataFormatImpl.standardMetadataFormatName)) {
53 if (root == null) {
54 throw new IllegalArgumentException ("root == null!");
55 }
56 mergeStandardTree(root);
57 } else {
58 throw new IllegalArgumentException ("Not a recognized format!");
59 }
60 }
61
62 public void reset() {
63 version = null;
64
65 logicalScreenWidth = UNDEFINED_INTEGER_VALUE;
66 logicalScreenHeight = UNDEFINED_INTEGER_VALUE;
67 colorResolution = UNDEFINED_INTEGER_VALUE;
68 pixelAspectRatio = 0;
69
70 backgroundColorIndex = 0;
71 sortFlag = false;
72 globalColorTable = null;
73 }
74
75 protected void mergeNativeTree(Node root) throws IIOInvalidTreeException {
76 Node node = root;
77 if (!node.getNodeName().equals(nativeMetadataFormatName)) {
78 fatal(node, "Root must be " + nativeMetadataFormatName);
79 }
80
81 node = node.getFirstChild();
82 while (node != null) {
83 String name = node.getNodeName();
84
85 if (name.equals("Version")) {
86 version = getStringAttribute(node, "value", null,
87 true, versionStrings);
88 } else if (name.equals("LogicalScreenDescriptor")) {
89
94 logicalScreenWidth = getIntAttribute(node,
95 "logicalScreenWidth",
96 UNDEFINED_INTEGER_VALUE,
97 true,
98 true, 1, 65535);
99
100 logicalScreenHeight = getIntAttribute(node,
101 "logicalScreenHeight",
102 UNDEFINED_INTEGER_VALUE,
103 true,
104 true, 1, 65535);
105
106 colorResolution = getIntAttribute(node,
107 "colorResolution",
108 UNDEFINED_INTEGER_VALUE,
109 true,
110 true, 1, 8);
111
112 pixelAspectRatio = getIntAttribute(node,
113 "pixelAspectRatio",
114 0, true,
115 true, 0, 255);
116 } else if (name.equals("GlobalColorTable")) {
117 int sizeOfGlobalColorTable =
118 getIntAttribute(node, "sizeOfGlobalColorTable",
119 true, 2, 256);
120 if (sizeOfGlobalColorTable != 2 &&
121 sizeOfGlobalColorTable != 4 &&
122 sizeOfGlobalColorTable != 8 &&
123 sizeOfGlobalColorTable != 16 &&
124 sizeOfGlobalColorTable != 32 &&
125 sizeOfGlobalColorTable != 64 &&
126 sizeOfGlobalColorTable != 128 &&
127 sizeOfGlobalColorTable != 256) {
128 fatal(node,
129 "Bad value for GlobalColorTable attribute sizeOfGlobalColorTable!");
130 }
131
132 backgroundColorIndex = getIntAttribute(node,
133 "backgroundColorIndex",
134 0, true,
135 true, 0, 255);
136
137 sortFlag = getBooleanAttribute(node, "sortFlag", false, true);
138
139 globalColorTable = getColorTable(node, "ColorTableEntry",
140 true, sizeOfGlobalColorTable);
141 } else {
142 fatal(node, "Unknown child of root node!");
143 }
144
145 node = node.getNextSibling();
146 }
147 }
148
149 protected void mergeStandardTree(Node root)
150 throws IIOInvalidTreeException {
151 Node node = root;
152 if (!node.getNodeName()
153 .equals(IIOMetadataFormatImpl.standardMetadataFormatName)) {
154 fatal(node, "Root must be " +
155 IIOMetadataFormatImpl.standardMetadataFormatName);
156 }
157
158 node = node.getFirstChild();
159 while (node != null) {
160 String name = node.getNodeName();
161
162 if (name.equals("Chroma")) {
163 Node childNode = node.getFirstChild();
164 while(childNode != null) {
165 String childName = childNode.getNodeName();
166 if (childName.equals("Palette")) {
167 globalColorTable = getColorTable(childNode,
168 "PaletteEntry",
169 false, -1);
170
171 } else if (childName.equals("BackgroundIndex")) {
172 backgroundColorIndex = getIntAttribute(childNode,
173 "value",
174 -1, true,
175 true, 0, 255);
176 }
177 childNode = childNode.getNextSibling();
178 }
179 } else if (name.equals("Data")) {
180 Node childNode = node.getFirstChild();
181 while(childNode != null) {
182 String childName = childNode.getNodeName();
183 if (childName.equals("BitsPerSample")) {
184 colorResolution = getIntAttribute(childNode,
185 "value",
186 -1, true,
187 true, 1, 8);
188 break;
189 }
190 childNode = childNode.getNextSibling();
191 }
192 } else if (name.equals("Dimension")) {
193 Node childNode = node.getFirstChild();
194 while(childNode != null) {
195 String childName = childNode.getNodeName();
196 if (childName.equals("PixelAspectRatio")) {
197 float aspectRatio = getFloatAttribute(childNode,
198 "value");
199 if (aspectRatio == 1.0F) {
200 pixelAspectRatio = 0;
201 } else {
202 int ratio = (int)(aspectRatio*64.0F - 15.0F);
203 pixelAspectRatio =
204 Math.max(Math.min(ratio, 255), 0);
205 }
206 } else if (childName.equals("HorizontalScreenSize")) {
207 logicalScreenWidth = getIntAttribute(childNode,
208 "value",
209 -1, true,
210 true, 1, 65535);
211 } else if (childName.equals("VerticalScreenSize")) {
212 logicalScreenHeight = getIntAttribute(childNode,
213 "value",
214 -1, true,
215 true, 1, 65535);
216 }
217 childNode = childNode.getNextSibling();
218 }
219 } else if (name.equals("Document")) {
220 Node childNode = node.getFirstChild();
221 while(childNode != null) {
222 String childName = childNode.getNodeName();
223 if (childName.equals("FormatVersion")) {
224 String formatVersion =
225 getStringAttribute(childNode, "value", null,
226 true, null);
227 for (int i = 0; i < versionStrings.length; i++) {
228 if (formatVersion.equals(versionStrings[i])) {
229 version = formatVersion;
230 break;
231 }
232 }
233 break;
234 }
235 childNode = childNode.getNextSibling();
236 }
237 }
238
239 node = node.getNextSibling();
240 }
241 }
242
243 public void setFromTree(String formatName, Node root)
244 throws IIOInvalidTreeException
245 {
246 reset();
247 mergeTree(formatName, root);
248 }
249 }
250 |
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