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/*
* $RCSfile: GIFWritableStreamMetadata.java,v $
*
*
* Copyright (c) 2005 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any
* kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
* WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
* EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
* NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
* USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
* ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
* CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
* REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
* INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for
* use in the design, construction, operation or maintenance of any
* nuclear facility.
*
* $Revision: 1.2 $
* $Date: 2006/03/24 22:30:11 $
* $State: Exp $
*/
package com.github.jaiimageio.impl.plugins.gif;
/*
* The source for this class was copied verbatim from the source for
* package com.sun.imageio.plugins.gif.GIFImageMetadata and then modified
* to make the class read-write capable.
*/
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 GIFWritableStreamMetadata extends GIFStreamMetadata {
// package scope
static final String
NATIVE_FORMAT_NAME = "javax_imageio_gif_stream_1.0";
public GIFWritableStreamMetadata() {
super(true,
NATIVE_FORMAT_NAME,
"com.github.jaiimageio.impl.plugins.gif.GIFStreamMetadataFormat",
null, null);
// initialize metadata fields by default values
reset();
}
public boolean isReadOnly() {
return false;
}
public void mergeTree(String formatName, Node root)
throws IIOInvalidTreeException {
if (formatName.equals(nativeMetadataFormatName)) {
if (root == null) {
throw new IllegalArgumentException("root == null!");
}
mergeNativeTree(root);
} else if (formatName.equals
(IIOMetadataFormatImpl.standardMetadataFormatName)) {
if (root == null) {
throw new IllegalArgumentException("root == null!");
}
mergeStandardTree(root);
} else {
throw new IllegalArgumentException("Not a recognized format!");
}
}
public void reset() {
version = null;
logicalScreenWidth = UNDEFINED_INTEGER_VALUE;
logicalScreenHeight = UNDEFINED_INTEGER_VALUE;
colorResolution = UNDEFINED_INTEGER_VALUE;
pixelAspectRatio = 0;
backgroundColorIndex = 0;
sortFlag = false;
globalColorTable = null;
}
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("Version")) {
version = getStringAttribute(node, "value", null,
true, versionStrings);
} else if (name.equals("LogicalScreenDescriptor")) {
/* NB: At the moment we use empty strings to support undefined
* integer values in tree representation.
* We need to add better support for undefined/default values
* later.
*/
logicalScreenWidth = getIntAttribute(node,
"logicalScreenWidth",
UNDEFINED_INTEGER_VALUE,
true,
true, 1, 65535);
logicalScreenHeight = getIntAttribute(node,
"logicalScreenHeight",
UNDEFINED_INTEGER_VALUE,
true,
true, 1, 65535);
colorResolution = getIntAttribute(node,
"colorResolution",
UNDEFINED_INTEGER_VALUE,
true,
true, 1, 8);
pixelAspectRatio = getIntAttribute(node,
"pixelAspectRatio",
0, true,
true, 0, 255);
} else if (name.equals("GlobalColorTable")) {
int sizeOfGlobalColorTable =
getIntAttribute(node, "sizeOfGlobalColorTable",
true, 2, 256);
if (sizeOfGlobalColorTable != 2 &&
sizeOfGlobalColorTable != 4 &&
sizeOfGlobalColorTable != 8 &&
sizeOfGlobalColorTable != 16 &&
sizeOfGlobalColorTable != 32 &&
sizeOfGlobalColorTable != 64 &&
sizeOfGlobalColorTable != 128 &&
sizeOfGlobalColorTable != 256) {
fatal(node,
"Bad value for GlobalColorTable attribute sizeOfGlobalColorTable!");
}
backgroundColorIndex = getIntAttribute(node,
"backgroundColorIndex",
0, true,
true, 0, 255);
sortFlag = getBooleanAttribute(node, "sortFlag", false, true);
globalColorTable = getColorTable(node, "ColorTableEntry",
true, sizeOfGlobalColorTable);
} 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")) {
globalColorTable = getColorTable(childNode,
"PaletteEntry",
false, -1);
} else if (childName.equals("BackgroundIndex")) {
backgroundColorIndex = getIntAttribute(childNode,
"value",
-1, true,
true, 0, 255);
}
childNode = childNode.getNextSibling();
}
} else if (name.equals("Data")) {
Node childNode = node.getFirstChild();
while(childNode != null) {
String childName = childNode.getNodeName();
if (childName.equals("BitsPerSample")) {
colorResolution = getIntAttribute(childNode,
"value",
-1, true,
true, 1, 8);
break;
}
childNode = childNode.getNextSibling();
}
} else if (name.equals("Dimension")) {
Node childNode = node.getFirstChild();
while(childNode != null) {
String childName = childNode.getNodeName();
if (childName.equals("PixelAspectRatio")) {
float aspectRatio = getFloatAttribute(childNode,
"value");
if (aspectRatio == 1.0F) {
pixelAspectRatio = 0;
} else {
int ratio = (int)(aspectRatio*64.0F - 15.0F);
pixelAspectRatio =
Math.max(Math.min(ratio, 255), 0);
}
} else if (childName.equals("HorizontalScreenSize")) {
logicalScreenWidth = getIntAttribute(childNode,
"value",
-1, true,
true, 1, 65535);
} else if (childName.equals("VerticalScreenSize")) {
logicalScreenHeight = getIntAttribute(childNode,
"value",
-1, true,
true, 1, 65535);
}
childNode = childNode.getNextSibling();
}
} else if (name.equals("Document")) {
Node childNode = node.getFirstChild();
while(childNode != null) {
String childName = childNode.getNodeName();
if (childName.equals("FormatVersion")) {
String formatVersion =
getStringAttribute(childNode, "value", null,
true, null);
for (int i = 0; i < versionStrings.length; i++) {
if (formatVersion.equals(versionStrings[i])) {
version = formatVersion;
break;
}
}
break;
}
childNode = childNode.getNextSibling();
}
}
node = node.getNextSibling();
}
}
public void setFromTree(String formatName, Node root)
throws IIOInvalidTreeException
{
reset();
mergeTree(formatName, root);
}
}
