我找到了this,它適用于我試過的一個gif.

我不知道他到底在做什么,但是看起來如果第一幀的延遲為0它會覆蓋所有幀的延遲為10.然后他在內存中“寫入”一個新的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誤.

>沒有專有API

>不只是檢查第一幀以確定它是否被竊聽,

>僅對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;

}

}

總結

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