Java example source code file (GIFWritableImageMetadata.java)
The GIFWritableImageMetadata.java Java example source code
/*
* Copyright (c) 2005, 2008, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package com.sun.imageio.plugins.gif;
import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.metadata.IIOInvalidTreeException;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.metadata.IIOMetadataNode;
import javax.imageio.metadata.IIOMetadataFormat;
import javax.imageio.metadata.IIOMetadataFormatImpl;
import org.w3c.dom.Node;
class GIFWritableImageMetadata extends GIFImageMetadata {
// package scope
static final String
NATIVE_FORMAT_NAME = "javax_imageio_gif_image_1.0";
GIFWritableImageMetadata() {
super(true,
NATIVE_FORMAT_NAME,
"com.sun.imageio.plugins.gif.GIFImageMetadataFormat",
null, null);
}
public boolean isReadOnly() {
return false;
}
public void reset() {
// Fields from Image Descriptor
imageLeftPosition = 0;
imageTopPosition = 0;
imageWidth = 0;
imageHeight = 0;
interlaceFlag = false;
sortFlag = false;
localColorTable = null;
// Fields from Graphic Control Extension
disposalMethod = 0;
userInputFlag = false;
transparentColorFlag = false;
delayTime = 0;
transparentColorIndex = 0;
// Fields from Plain Text Extension
hasPlainTextExtension = false;
textGridLeft = 0;
textGridTop = 0;
textGridWidth = 0;
textGridHeight = 0;
characterCellWidth = 0;
characterCellHeight = 0;
textForegroundColor = 0;
textBackgroundColor = 0;
text = null;
// Fields from ApplicationExtension
applicationIDs = null;
authenticationCodes = null;
applicationData = null;
// Fields from CommentExtension
// List of byte[]
comments = null;
}
private byte[] fromISO8859(String data) {
try {
return data.getBytes("ISO-8859-1");
} catch (UnsupportedEncodingException e) {
return "".getBytes();
}
}
protected void mergeNativeTree(Node root) throws IIOInvalidTreeException {
Node node = root;
if (!node.getNodeName().equals(nativeMetadataFormatName)) {
fatal(node, "Root must be " + nativeMetadataFormatName);
}
node = node.getFirstChild();
while (node != null) {
String name = node.getNodeName();
if (name.equals("ImageDescriptor")) {
imageLeftPosition = getIntAttribute(node,
"imageLeftPosition",
-1, true,
true, 0, 65535);
imageTopPosition = getIntAttribute(node,
"imageTopPosition",
-1, true,
true, 0, 65535);
imageWidth = getIntAttribute(node,
"imageWidth",
-1, true,
true, 1, 65535);
imageHeight = getIntAttribute(node,
"imageHeight",
-1, true,
true, 1, 65535);
interlaceFlag = getBooleanAttribute(node, "interlaceFlag",
false, true);
} else if (name.equals("LocalColorTable")) {
int sizeOfLocalColorTable =
getIntAttribute(node, "sizeOfLocalColorTable",
true, 2, 256);
if (sizeOfLocalColorTable != 2 &&
sizeOfLocalColorTable != 4 &&
sizeOfLocalColorTable != 8 &&
sizeOfLocalColorTable != 16 &&
sizeOfLocalColorTable != 32 &&
sizeOfLocalColorTable != 64 &&
sizeOfLocalColorTable != 128 &&
sizeOfLocalColorTable != 256) {
fatal(node,
"Bad value for LocalColorTable attribute sizeOfLocalColorTable!");
}
sortFlag = getBooleanAttribute(node, "sortFlag", false, true);
localColorTable = getColorTable(node, "ColorTableEntry",
true, sizeOfLocalColorTable);
} else if (name.equals("GraphicControlExtension")) {
String disposalMethodName =
getStringAttribute(node, "disposalMethod", null,
true, disposalMethodNames);
disposalMethod = 0;
while(!disposalMethodName.equals(disposalMethodNames[disposalMethod])) {
disposalMethod++;
}
userInputFlag = getBooleanAttribute(node, "userInputFlag",
false, true);
transparentColorFlag =
getBooleanAttribute(node, "transparentColorFlag",
false, true);
delayTime = getIntAttribute(node,
"delayTime",
-1, true,
true, 0, 65535);
transparentColorIndex =
getIntAttribute(node, "transparentColorIndex",
-1, true,
true, 0, 65535);
} else if (name.equals("PlainTextExtension")) {
hasPlainTextExtension = true;
textGridLeft = getIntAttribute(node,
"textGridLeft",
-1, true,
true, 0, 65535);
textGridTop = getIntAttribute(node,
"textGridTop",
-1, true,
true, 0, 65535);
textGridWidth = getIntAttribute(node,
"textGridWidth",
-1, true,
true, 1, 65535);
textGridHeight = getIntAttribute(node,
"textGridHeight",
-1, true,
true, 1, 65535);
characterCellWidth = getIntAttribute(node,
"characterCellWidth",
-1, true,
true, 1, 65535);
characterCellHeight = getIntAttribute(node,
"characterCellHeight",
-1, true,
true, 1, 65535);
textForegroundColor = getIntAttribute(node,
"textForegroundColor",
-1, true,
true, 0, 255);
textBackgroundColor = getIntAttribute(node,
"textBackgroundColor",
-1, true,
true, 0, 255);
// XXX The "text" attribute of the PlainTextExtension element
// is not defined in the GIF image metadata format but it is
// present in the GIFImageMetadata class. Consequently it is
// used here but not required and with a default of "". See
// bug 5082763.
String textString =
getStringAttribute(node, "text", "", false, null);
text = fromISO8859(textString);
} else if (name.equals("ApplicationExtensions")) {
IIOMetadataNode applicationExtension =
(IIOMetadataNode)node.getFirstChild();
if (!applicationExtension.getNodeName().equals("ApplicationExtension")) {
fatal(node,
"Only a ApplicationExtension may be a child of a ApplicationExtensions!");
}
String applicationIDString =
getStringAttribute(applicationExtension, "applicationID",
null, true, null);
String authenticationCodeString =
getStringAttribute(applicationExtension, "authenticationCode",
null, true, null);
Object applicationExtensionData =
applicationExtension.getUserObject();
if (applicationExtensionData == null ||
!(applicationExtensionData instanceof byte[])) {
fatal(applicationExtension,
"Bad user object in ApplicationExtension!");
}
if (applicationIDs == null) {
applicationIDs = new ArrayList();
authenticationCodes = new ArrayList();
applicationData = new ArrayList();
}
applicationIDs.add(fromISO8859(applicationIDString));
authenticationCodes.add(fromISO8859(authenticationCodeString));
applicationData.add(applicationExtensionData);
} else if (name.equals("CommentExtensions")) {
Node commentExtension = node.getFirstChild();
if (commentExtension != null) {
while(commentExtension != null) {
if (!commentExtension.getNodeName().equals("CommentExtension")) {
fatal(node,
"Only a CommentExtension may be a child of a CommentExtensions!");
}
if (comments == null) {
comments = new ArrayList();
}
String comment =
getStringAttribute(commentExtension, "value", null,
true, null);
comments.add(fromISO8859(comment));
commentExtension = commentExtension.getNextSibling();
}
}
} else {
fatal(node, "Unknown child of root node!");
}
node = node.getNextSibling();
}
}
protected void mergeStandardTree(Node root)
throws IIOInvalidTreeException {
Node node = root;
if (!node.getNodeName()
.equals(IIOMetadataFormatImpl.standardMetadataFormatName)) {
fatal(node, "Root must be " +
IIOMetadataFormatImpl.standardMetadataFormatName);
}
node = node.getFirstChild();
while (node != null) {
String name = node.getNodeName();
if (name.equals("Chroma")) {
Node childNode = node.getFirstChild();
while(childNode != null) {
String childName = childNode.getNodeName();
if (childName.equals("Palette")) {
localColorTable = getColorTable(childNode,
"PaletteEntry",
false, -1);
break;
}
childNode = childNode.getNextSibling();
}
} else if (name.equals("Compression")) {
Node childNode = node.getFirstChild();
while(childNode != null) {
String childName = childNode.getNodeName();
if (childName.equals("NumProgressiveScans")) {
int numProgressiveScans =
getIntAttribute(childNode, "value", 4, false,
true, 1, Integer.MAX_VALUE);
if (numProgressiveScans > 1) {
interlaceFlag = true;
}
break;
}
childNode = childNode.getNextSibling();
}
} else if (name.equals("Dimension")) {
Node childNode = node.getFirstChild();
while(childNode != null) {
String childName = childNode.getNodeName();
if (childName.equals("HorizontalPixelOffset")) {
imageLeftPosition = getIntAttribute(childNode,
"value",
-1, true,
true, 0, 65535);
} else if (childName.equals("VerticalPixelOffset")) {
imageTopPosition = getIntAttribute(childNode,
"value",
-1, true,
true, 0, 65535);
}
childNode = childNode.getNextSibling();
}
} else if (name.equals("Text")) {
Node childNode = node.getFirstChild();
while(childNode != null) {
String childName = childNode.getNodeName();
if (childName.equals("TextEntry") &&
getAttribute(childNode, "compression",
"none", false).equals("none") &&
Charset.isSupported(getAttribute(childNode,
"encoding",
"ISO-8859-1",
false))) {
String value = getAttribute(childNode, "value");
byte[] comment = fromISO8859(value);
if (comments == null) {
comments = new ArrayList();
}
comments.add(comment);
}
childNode = childNode.getNextSibling();
}
} else if (name.equals("Transparency")) {
Node childNode = node.getFirstChild();
while(childNode != null) {
String childName = childNode.getNodeName();
if (childName.equals("TransparentIndex")) {
transparentColorIndex = getIntAttribute(childNode,
"value",
-1, true,
true, 0, 255);
transparentColorFlag = true;
break;
}
childNode = childNode.getNextSibling();
}
}
node = node.getNextSibling();
}
}
public void setFromTree(String formatName, Node root)
throws IIOInvalidTreeException
{
reset();
mergeTree(formatName, root);
}
}
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