镜像负载gif动画在Java中 - 的ImageIcon [英] Mirroring animated gif on load in Java - ImageIcon
问题描述
所以，我有一个GIF动画，我加载到一个ImageIcon是这样的：
So I have an animated gif that I load into an ImageIcon like this:
Image image = new ImageIcon("image.gif").getImage();
我可以用这个画吧：
and I can draw it using this:
g.drawImage(image, x, y, null);
我知道我可以镜像它使用的AffineTransform飞，但我需要能够加载后水平，以反映它，这样我可以得出镜像酮代替如果需要的话，而不每次获得一次改变它的开销重绘。有没有办法做到这一点使用摆动/ AWT？
I know that I can mirror it on the fly using AffineTransform, but I need to be able to mirror it horizontally after loading, so that I can draw the mirrored one instead if needed without the overhead of transforming it every time it gets redrawn. Is there a way to do this using swing/awt?
这是可以做到这一点的库也将是一个巨大的帮助。
A library that could do this would also be a huge help.
推荐答案
但问题是，正如你所指出的那样，是GIF的是动画的事实。
The problem is, as you have pointed out, is the fact the gif's are animated.
除非你拼命想要接管不必自己渲染每一帧的工作，你唯一的选择就是在paint方法来使用的AffineTransform 与
Unless you desperately want to take over the job of having to render each frame yourself, the only choice you have is to use an AffineTransform with in the paint method.
一般来说，你不应该看到一个显著差异（渲染）。
Generally speaking, you shouldn't see a significant difference (in rendering).
如果你是真的绝望了，你可以简单地$ P $外部P-渲染GIF和提供镜像版本
If you are really desperate, you could simply pre-render the gif externally and provide a mirrored version
更新与种的工作例如
这是<一个组合href=\"http://stackoverflow.com/questions/6967809/writing-an-animated-gif-from-bufferedimages\">this和这的答案，使用的这个 GIF作家。
This is a combination of this and this answers, using this GIF writer.
基本上，这个例子所做的就是读取原始GIF图像，反映了它逐帧，并写回了一个镜像文件。
Basically what this example does is it reads an original gif image, mirrors it frame by frame, and writes back out to a mirrored file.
然后，它加载既原始又回到了镜像文件，的ImageIcon S，主要是因为我没有真正达到重新发明用于显示GIF动画的车轮。是的，你可以做到这一点，你会需要的是内提供的一切。
It then loads both the original and mirrored files back in as ImageIcons, mostly because I'm not really up to re-inventing the wheel for display animated gifs. Yes, you could do it and everything you would need is provided within..
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsEnvironment;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.awt.image.RenderedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.imageio.IIOException;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.metadata.IIOMetadataNode;
import javax.imageio.stream.FileImageOutputStream;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.ImageOutputStream;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
public class MirrorImage {
public static void main(String[] args) {
new MirrorImage();
}
public MirrorImage() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private ImageIcon orig;
private ImageIcon mirror;
public TestPane() {
mirror(new File("java_animated.gif"), new File("Mirror.gif"));
orig = new ImageIcon("java_animated.gif");
mirror = new ImageIcon("Mirror.gif");
}
@Override
public Dimension getPreferredSize() {
return mirror == null ? new Dimension(200, 200) : new Dimension(orig.getIconWidth(), orig.getIconHeight() * 2);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (orig != null) {
Graphics2D g2d = (Graphics2D) g.create();
int x = (getWidth() - orig.getIconWidth()) / 2;
int y = (getHeight() - (orig.getIconHeight() * 2)) / 2;
g2d.drawImage(orig.getImage(), x, y, this);
// AffineTransform at = new AffineTransform();
// at.setToScale(1, -1);
// at.translate(0, -mirror.getIconHeight());
// g2d.setTransform(at);
g2d.drawImage(mirror.getImage(), x, y + mirror.getIconHeight(), this);
g2d.dispose();
}
}
}
public static void mirror(File source, File dest) {
List<BufferedImage> images = new ArrayList<>(25);
List<Integer> delays = new ArrayList<>(25);
int delay = 0;
ImageOutputStream output = null;
GifSequenceWriter writer = null;
try {
String[] imageatt = new String[]{
"imageLeftPosition",
"imageTopPosition",
"imageWidth",
"imageHeight"
};
ImageReader reader = (ImageReader) ImageIO.getImageReadersByFormatName("gif").next();
ImageInputStream ciis = ImageIO.createImageInputStream(source);
reader.setInput(ciis, false);
int noi = reader.getNumImages(true);
BufferedImage master = null;
for (int i = 0; i < noi; i++) {
BufferedImage image = reader.read(i);
IIOMetadata metadata = reader.getImageMetadata(i);
Node tree = metadata.getAsTree("javax_imageio_gif_image_1.0");
NodeList children = tree.getChildNodes();
for (int j = 0; j < children.getLength(); j++) {
Node nodeItem = children.item(j);
System.out.println(nodeItem.getNodeName());
if (nodeItem.getNodeName().equals("ImageDescriptor")) {
Map<String, Integer> imageAttr = new HashMap<String, Integer>();
NamedNodeMap attr = nodeItem.getAttributes();
// for (int index = 0; index < attr.getLength(); index++) {
// Node node = attr.item(index);
// System.out.println("----> " + node.getNodeName() + "=" + node.getNodeValue());
// }
for (int k = 0; k < imageatt.length; k++) {
Node attnode = attr.getNamedItem(imageatt[k]);
imageAttr.put(imageatt[k], Integer.valueOf(attnode.getNodeValue()));
}
if (master == null) {
master = new BufferedImage(imageAttr.get("imageWidth"), imageAttr.get("imageHeight"), BufferedImage.TYPE_INT_ARGB);
}
Graphics2D g2d = master.createGraphics();
g2d.drawImage(image, imageAttr.get("imageLeftPosition"), imageAttr.get("imageTopPosition"), null);
g2d.dispose();
BufferedImage frame = mirror(copyImage(master));
ImageIO.write(frame, "png", new File("img" + i + ".png"));
images.add(frame);
} else if (nodeItem.getNodeName().equals("GraphicControlExtension")) {
NamedNodeMap attr = nodeItem.getAttributes();
Node delayNode = attr.getNamedItem("delayTime");
if (delayNode != null) {
delay = Math.max(delay, Integer.valueOf(delayNode.getNodeValue()));
delays.add(delay);
}
}
}
}
output = new FileImageOutputStream(dest);
writer = new GifSequenceWriter(output, images.get(0).getType(), delay * 10, true);
for (int i = 0; i < images.size(); i++) {
BufferedImage nextImage = images.get(i);
writer.writeToSequence(nextImage);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
try {
writer.close();
} catch (Exception e) {
}
try {
output.close();
} catch (Exception e) {
}
}
}
public static BufferedImage mirror(BufferedImage img) {
BufferedImage mirror = createCompatibleImage(img);
Graphics2D g2d = mirror.createGraphics();
AffineTransform at = new AffineTransform();
at.setToScale(1, -1);
at.translate(0, -img.getHeight());
g2d.setTransform(at);
g2d.drawImage(img, 0, 0, null);
g2d.dispose();
return mirror;
}
public static BufferedImage copyImage(BufferedImage img) {
int width = img.getWidth();
int height = img.getHeight();
BufferedImage newImage = createCompatibleImage(img);
Graphics graphics = newImage.createGraphics();
int x = (width - img.getWidth()) / 2;
int y = (height - img.getHeight()) / 2;
graphics.drawImage(img, x, y, img.getWidth(), img.getHeight(), null);
graphics.dispose();
return newImage;
}
public static BufferedImage createCompatibleImage(BufferedImage image) {
return getGraphicsConfiguration().createCompatibleImage(image.getWidth(), image.getHeight(), image.getTransparency());
}
public static GraphicsConfiguration getGraphicsConfiguration() {
return GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getDefaultConfiguration();
}
public static class GifSequenceWriter {
protected ImageWriter gifWriter;
protected ImageWriteParam imageWriteParam;
protected IIOMetadata imageMetaData;
/**
* 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
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);
}
/**
* Close this GifSequenceWriter object. This does not close the underlying
* stream, just finishes off the GIF.
*/
public void close() throws IOException {
gifWriter.endWriteSequence();
}
/**
* 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 {
Iterator<ImageWriter> iter = ImageIO.getImageWritersBySuffix("gif");
if (!iter.hasNext()) {
throw new IIOException("No GIF Image Writers Exist");
} else {
return iter.next();
}
}
/**
* 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);
}
}
}
注意事项
下，GIF writer目前仅适用于固定利率的GIF。它应该是可以改变这一点，但我没有时间。
The Gif writer currently only works with fixed rate gifs. It should be possible to change this, but I didn't have the time.
基本上，我的理解是，你需要通过一个框架延迟到 writeToSquence 方法。在这个方法中，你需要构建一个合适的的IIOMetadata 与所有要求的性能，再加上你的帧延迟...
Basically, as I understand it, you would need to pass a "frame" delay to the writeToSquence method. Within this method you would need to construct an appropriate IIOMetadata with all the required properties, plus your frame delay...
原装GIF播放后更新
的GIF我用了优化播放。也就是说，每个帧加入到动画，而不是作为一个全新的帧。你是相反。每帧是整个图像。
The GIF I was playing with was optimised. That is, each frame "added" to the animation, rather then being a brand new frame. Yours is the other way round. Each frame is an entire image.
现在，大概有很多，你可以检查这个方法，但是现在，我不能打扰...
Now, there are probably lots of ways you could check for this, but right now, I can't be bothered...
相反......在镜（文件，文件）方法，我改变它，以便而不是使用一个单一的大师的形象，每一帧创建一个新的的BufferedImage
Instead...in the mirror(File, File) method, I changed it so that rather then using a single "master" image, each frame creates a new BufferedImage
BufferedImage frame = new BufferedImage(imageAttr.get("imageWidth"), imageAttr.get("imageHeight"), BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = frame.createGraphics();
g2d.drawImage(image, imageAttr.get("imageLeftPosition"), imageAttr.get("imageTopPosition"), null);
g2d.dispose();
frame = mirror(frame);
ImageIO.write(frame, "png", new File("img" + i + ".png"));
images.add(frame);
我也更新了 GifSequenceWriter 来设置元数据更紧密地匹配原始以及...
I also updated the GifSequenceWriter to set the meta data to more closely match the original as well...
graphicsControlExtensionNode.setAttribute("disposalMethod", "restoreToBackgroundColor");
graphicsControlExtensionNode.setAttribute("userInputFlag", "FALSE");
graphicsControlExtensionNode.setAttribute(
"transparentColorFlag",
"TRUE");
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