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Miscellaneous utilities for Java 8
/*
* Copyright (c) 2019 by Andrew Charneski.
*
* The author licenses this file to you under the
* Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance
* with the License. You may obtain a copy
* of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package com.simiacryptus.util.io;
// Originally Created by Elliot Kroo on 2009-04-25.
//
// This work is licensed under the Creative Commons Attribution 3.0 Unported
// License. To view a copy of this license, visit
// http://creativecommons.org/licenses/by/3.0/ or send a letter to Creative
// Commons, 171 Second Street, Suite 300, San Francisco, California, 94105, USA.
import javax.annotation.Nonnull;
import javax.imageio.*;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.metadata.IIOMetadataNode;
import javax.imageio.stream.FileImageOutputStream;
import javax.imageio.stream.ImageOutputStream;
import java.awt.image.BufferedImage;
import java.awt.image.RenderedImage;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
public class GifSequenceWriter {
protected ImageWriter gifWriter;
protected ImageWriteParam imageWriteParam;
protected IIOMetadata imageMetaData;
public GifSequenceWriter(
ImageOutputStream outputStream,
int imageType,
int timeBetweenFramesMS,
boolean loopContinuously) throws IOException {
gifWriter = getWriter("gif");
imageWriteParam = gifWriter.getDefaultWriteParam();
ImageTypeSpecifier imageTypeSpecifier = ImageTypeSpecifier.createFromBufferedImageType(imageType);
imageMetaData = gifWriter.getDefaultImageMetadata(imageTypeSpecifier, imageWriteParam);
String metaFormatName = imageMetaData.getNativeMetadataFormatName();
@Nonnull IIOMetadataNode root = (IIOMetadataNode) imageMetaData.getAsTree(metaFormatName);
@Nonnull IIOMetadataNode graphicsControlExtensionNode = getNode(root, "GraphicControlExtension");
graphicsControlExtensionNode.setAttribute("disposalMethod", "none");
graphicsControlExtensionNode.setAttribute("userInputFlag", "FALSE");
graphicsControlExtensionNode.setAttribute("transparentColorFlag", "FALSE");
graphicsControlExtensionNode.setAttribute("delayTime", Integer.toString(timeBetweenFramesMS / 10));
graphicsControlExtensionNode.setAttribute("transparentColorIndex", "0");
@Nonnull IIOMetadataNode commentsNode = getNode(root, "CommentExtensions");
commentsNode.setAttribute("CommentExtension", "Created by MindsEye");
@Nonnull IIOMetadataNode appEntensionsNode = getNode(root, "ApplicationExtensions");
@Nonnull IIOMetadataNode child = new IIOMetadataNode("ApplicationExtension");
child.setAttribute("applicationID", "NETSCAPE");
child.setAttribute("authenticationCode", "2.0");
int loop = loopContinuously ? 0 : 1;
child.setUserObject(new byte[]{0x1, (byte) (loop & 0xFF), (byte) ((loop >> 8) & 0xFF)});
appEntensionsNode.appendChild(child);
imageMetaData.setFromTree(metaFormatName, root);
gifWriter.setOutput(outputStream);
gifWriter.prepareWriteSequence(null);
}
public static void write(File gif, int timeBetweenFramesMS, boolean loopContinuously, @Nonnull BufferedImage... images) throws IOException {
@Nonnull ImageOutputStream output = new FileImageOutputStream(gif);
write(output, timeBetweenFramesMS, loopContinuously, images);
}
public static void write(ImageOutputStream output, int timeBetweenFramesMS, boolean loopContinuously, @Nonnull BufferedImage... images) throws IOException {
try {
@Nonnull GifSequenceWriter writer = new GifSequenceWriter(output, images[0].getType(), timeBetweenFramesMS, loopContinuously);
for (@Nonnull BufferedImage image : images) {
writer.writeToSequence(image);
}
writer.close();
} finally {
output.close();
}
}
private static ImageWriter getWriter(@Nonnull String format) throws IIOException {
Iterator iter = ImageIO.getImageWritersBySuffix(format);
if (!iter.hasNext()) {
throw new IIOException("No GIF Image Writers Exist");
} else {
return iter.next();
}
}
@Nonnull
private static IIOMetadataNode getNode(
@Nonnull IIOMetadataNode rootNode,
String nodeName) {
int nNodes = rootNode.getLength();
for (int i = 0; i < nNodes; i++) {
if (rootNode.item(i).getNodeName().compareToIgnoreCase(nodeName)
== 0) {
@Nonnull IIOMetadataNode item = (IIOMetadataNode) rootNode.item(i);
if (null == item) throw new IllegalStateException();
return item;
}
}
@Nonnull IIOMetadataNode node = new IIOMetadataNode(nodeName);
rootNode.appendChild(node);
return (node);
}
public void writeToSequence(@Nonnull RenderedImage img) throws IOException {
gifWriter.writeToSequence(
new IIOImage(
img,
null,
imageMetaData),
imageWriteParam);
}
public void close() throws IOException {
gifWriter.endWriteSequence();
}
}
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