/** Returns whether the given icon is an animated GIF. */
public static boolean isAnimated(Icon icon) {
if (icon instanceof ImageIcon) {
Image image = ((ImageIcon) icon).getImage();
if (image != null) {
// Quick check for commonly-occurring animated GIF comment
Object comment = image.getProperty("comment", null);
if (String.valueOf(comment).startsWith("GifBuilder")) return true;
// Check cache of already-decoded images
if (decoded.containsKey(image)) {
return Boolean.TRUE.equals(decoded.get(image));
}
InputStream is = null;
try {
URL url = new URL(icon.toString());
is = url.openConnection().getInputStream();
} catch (Exception e) {
e.printStackTrace();
}
if (is == null) {
try {
// Beware: lots of hackery to obtain the image input stream
// Be sure to catch security exceptions
ImageProducer p = image.getSource();
// [macavity] - below rem'd lines don't compile on mac
// if (p instanceof InputStreamImageSource) {
// Method m =
// InputStreamImageSource.class.getDeclaredMethod("getDecoder", null);
// m.setAccessible(true);
// ImageDecoder d = (ImageDecoder)m.invoke(p, null);
// if (d instanceof GifImageDecoder) {
// GifImageDecoder gd = (GifImageDecoder)d;
// Field input =
// ImageDecoder.class.getDeclaredField("input");
// input.setAccessible(true);
// is = (InputStream)input.get(gd);
// }
// }
} catch (Exception e) {
e.printStackTrace();
}
}
if (is != null) {
GifDecoder decoder = new GifDecoder();
decoder.read(is);
boolean animated = decoder.getFrameCount() > 1;
decoded.put(image, Boolean.valueOf(animated));
return animated;
}
}
return false;
}
return icon instanceof AnimatedIcon;
}
public Object getProperty(String name, ImageObserver observer) {
return real.getProperty(name, observer);
}