java gif 帧_在Java中修复动画gif的帧速率
我找到了this,它適用于我試過(guò)的一個(gè)gif.
我不知道他到底在做什么,但是看起來(lái)如果第一幀的延遲為0它會(huì)覆蓋所有幀的延遲為10.然后他在內(nèi)存中“寫入”一個(gè)新的GIF文件并將其加載到圖片.
[編輯]我把它打磨了一下并解決了這些錯(cuò)誤.
>沒(méi)有專有API
>不只是檢查第一幀以確定它是否被竊聽(tīng),
>僅對(duì)其為零的幀替換延遲.
public static Image readImgFromFile(String filename, Component parent) {
File file = new File(filename);
if (!file.exists()) {
return null;
}
// Fix for bug when delay is 0
try {
// Load anything but GIF the normal way
if (!filename.substring(filename.length() - 4).equalsIgnoreCase(".gif")) {
return ImageIO.read(file);
}
// Get GIF reader
ImageReader reader = ImageIO.getImageReadersByFormatName("gif").next();
// Give it the stream to decode from
reader.setInput(ImageIO.createImageInputStream(file));
int numImages = reader.getNumImages(true);
// Get 'metaFormatName'. Need first frame for that.
IIOMetadata imageMetaData = reader.getImageMetadata(0);
String metaFormatName = imageMetaData.getNativeMetadataFormatName();
// Find out if GIF is bugged
boolean foundBug = false;
for (int i = 0; i < numImages && !foundBug; i++) {
// Get metadata
IIOMetadataNode root = (IIOMetadataNode)reader.getImageMetadata(i).getAsTree(metaFormatName);
// Find GraphicControlExtension node
int nNodes = root.getLength();
for (int j = 0; j < nNodes; j++) {
Node node = root.item(j);
if (node.getNodeName().equalsIgnoreCase("GraphicControlExtension")) {
// Get delay value
String delay = ((IIOMetadataNode)node).getAttribute("delayTime");
// Check if delay is bugged
if (Integer.parseInt(delay) == 0) {
foundBug = true;
}
break;
}
}
}
// Load non-bugged GIF the normal way
Image image;
if (!foundBug) {
image = Toolkit.getDefaultToolkit().createImage(filename);
} else {
// Prepare streams for image encoding
ByteArrayOutputStream baoStream = new ByteArrayOutputStream();
try (ImageOutputStream ios = ImageIO.createImageOutputStream(baoStream)) {
// Get GIF writer that's compatible with reader
ImageWriter writer = ImageIO.getImageWriter(reader);
// Give it the stream to encode to
writer.setOutput(ios);
writer.prepareWriteSequence(null);
for (int i = 0; i < numImages; i++) {
// Get input image
BufferedImage frameIn = reader.read(i);
// Get input metadata
IIOMetadataNode root = (IIOMetadataNode)reader.getImageMetadata(i).getAsTree(metaFormatName);
// Find GraphicControlExtension node
int nNodes = root.getLength();
for (int j = 0; j < nNodes; j++) {
Node node = root.item(j);
if (node.getNodeName().equalsIgnoreCase("GraphicControlExtension")) {
// Get delay value
String delay = ((IIOMetadataNode)node).getAttribute("delayTime");
// Check if delay is bugged
if (Integer.parseInt(delay) == 0) {
// Overwrite with a valid delay value
((IIOMetadataNode)node).setAttribute("delayTime", "10");
}
break;
}
}
// Create output metadata
IIOMetadata metadata = writer.getDefaultImageMetadata(new ImageTypeSpecifier(frameIn), null);
// Copy metadata to output metadata
metadata.setFromTree(metadata.getNativeMetadataFormatName(), root);
// Create output image
IIOImage frameOut = new IIOImage(frameIn, null, metadata);
// Encode output image
writer.writeToSequence(frameOut, writer.getDefaultWriteParam());
}
writer.endWriteSequence();
}
// Create image using encoded data
image = Toolkit.getDefaultToolkit().createImage(baoStream.toByteArray());
}
// Trigger lazy loading of image
MediaTracker mt = new MediaTracker(parent);
mt.addImage(image, 0);
try {
mt.waitForAll();
}
catch (InterruptedException e) {
image = null;
}
return image;
}
catch (IOException e) {
e.printStackTrace();
return null;
}
}
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