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POJEditorPane high cpu usage while showing particular unanimated GIFs
 

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  1. POJEditorPane high cpu usage while showing particular unanimated GIFs
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    <p>My application shows RSS entries in a JEditorPane. It works not that bad, but I've encountered a serious issue lately while displaying a gif. Here's a small test case :</p> <pre><code>public class JEditorPaneTest { public static void main(String[] args) { JFrame dialog = new JFrame("JEditorPane test"); dialog.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container c = dialog.getContentPane(); c.setLayout(new BorderLayout()); JEditorPane editorPane = new JEditorPane(); editorPane.setEditorKit(new HTMLEditorKit()); editorPane.setText("&lt;html&gt;&lt;body&gt;&lt;img src=\"http://feeds.feedburner.com/~ff/MacRumors-All?d=yIl2AUoC8zA\"&gt;&lt;/body&gt;&lt;/html&gt;"); c.add(new JScrollPane(editorPane), BorderLayout.CENTER); dialog.pack(); dialog.setVisible(true); } } </code></pre> <p>The unanimated gif is flickering and the CPU usage is up to 300% (quad-core computer) on Mac OS X or 50% on Windows 7. This issue is even more severe since after disposing the editor pane, the CPU usage is still that high.</p> <p>Looking at some profiling, it looks like 50% of the cpu usage time is in the Event dispatcher thread and the other 50% is in sun.awt.image.ImageFetcher.run().</p> <p>Another interesting fact is that it happens also when embedding html in a JLabel.</p> <p>(EDIT : 9 march 2012) Another interesting fact is that if the file is downloaded locally first (and accessed by file://...) or even, being a resource do not fix anything. But if the image is shown in ImageIcon in a JLabel, there is no flickering and high CPU usage. Somehow, I really need to use a HTML document in a JEditorPane to render some basic HTML formatting.</p> <p>I am looking for a general solution to avoid censoring images from feedburner.com and, these gifs from feedburner.com are the only one I found yet, but I would like prevent having the bug with all other images that could behave the same way.</p> <p>Thanks a lot.</p>
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    1. USBéatrice Cassistat
    1. USBéatrice Cassistat
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      1. VTUpMod
    1. COMy guess is that you would be better off reading the image into your code using the HttpURLConnection class, then displaying the image in your editorPane.
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      1. USGilbert Le Blanc
    2. COThanks for your suggestion Gilbert, but actually using the local saved file and using <img src="file://..."> does not fix the problem.
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      1. USBéatrice Cassistat
    3. COI guess I wasn't clear. Read the image into your Java program, getting a BufferedImage or Image as a result. Then convert to an ImageIcon for display in your editorPane.
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      1. USGilbert Le Blanc
 

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