// // GifSequenceWriter.java // // Created by Elliot Kroo on 2009-04-25. // (modified here) // import javax.imageio.*; import javax.imageio.metadata.*; import javax.imageio.stream.*; import java.awt.image.*; sclass GifSequenceWriter implements AutoCloseable { protected ImageWriter gifWriter; protected ImageWriteParam imageWriteParam; protected IIOMetadata imageMetaData; ImageOutputStream stream; /** * Creates a new GifSequenceWriter * * @param outputStream the ImageOutputStream to be written to * @param imageType one of the imageTypes specified in BufferedImage * @param timeBetweenFramesMS the time between frames in miliseconds * @param loopContinuously wether the gif should loop repeatedly * @throws IIOException if no gif ImageWriters are found * * @author Elliot Kroo (elliot[at]kroo[dot]net) */ public GifSequenceWriter( ImageOutputStream outputStream, int imageType, int timeBetweenFramesMS, boolean loopContinuously) throws IIOException, IOException { // my method to create a writer stream = outputStream; gifWriter = getWriter(); imageWriteParam = gifWriter.getDefaultWriteParam(); ImageTypeSpecifier imageTypeSpecifier = ImageTypeSpecifier.createFromBufferedImageType(imageType); imageMetaData = gifWriter.getDefaultImageMetadata(imageTypeSpecifier, imageWriteParam); String metaFormatName = imageMetaData.getNativeMetadataFormatName(); IIOMetadataNode root = (IIOMetadataNode) imageMetaData.getAsTree(metaFormatName); 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"); IIOMetadataNode commentsNode = getNode(root, "CommentExtensions"); commentsNode.setAttribute("CommentExtension", "Created by MAH"); IIOMetadataNode appEntensionsNode = getNode( root, "ApplicationExtensions"); 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 void writeToSequence(RenderedImage img) throws IOException { gifWriter.writeToSequence( new IIOImage( img, null, imageMetaData), imageWriteParam); } /** * Now also closes the stream */ public void close() throws IOException { gifWriter.endWriteSequence(); stream.close(); } /** * Returns the first available GIF ImageWriter using * ImageIO.getImageWritersBySuffix("gif"). * * @return a GIF ImageWriter object * @throws IIOException if no GIF image writers are returned */ private static ImageWriter getWriter() throws IIOException { ret assertNotNull("No GIF Image Writers Exist", first(ImageIO.getImageWritersBySuffix("gif"))); } /** * Returns an existing child node, or creates and returns a new child node (if * the requested node does not exist). * * @param rootNode the <tt>IIOMetadataNode</tt> to search for the child node. * @param nodeName the name of the child node. * * @return the child node, if found or a new node created with the given name. */ private static IIOMetadataNode getNode( IIOMetadataNode rootNode, String nodeName) { int nNodes = rootNode.getLength(); for (int i = 0; i < nNodes; i++) { if (rootNode.item(i).getNodeName().compareToIgnoreCase(nodeName) == 0) { return((IIOMetadataNode) rootNode.item(i)); } } IIOMetadataNode node = new IIOMetadataNode(nodeName); rootNode.appendChild(node); return(node); } }
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Snippet ID: | #1003673 |
Snippet name: | class GifSequenceWriter |
Eternal ID of this version: | #1003673/4 |
Text MD5: | bc937f9c3739b4d63910aa35451ab9d4 |
Author: | stefan |
Category: | javax / utils |
Type: | JavaX fragment (include) |
Public (visible to everyone): | Yes |
Archived (hidden from active list): | No |
Created/modified: | 2018-11-30 13:25:13 |
Source code size: | 4566 bytes / 144 lines |
Pitched / IR pitched: | No / No |
Views / Downloads: | 665 / 1207 |
Version history: | 3 change(s) |
Referenced in: | #1034167 - Standard Classes + Interfaces (LIVE, continuation of #1003674) |