Creating a javax.microedition.lcdui.Image Image on a J2Se environment

[TacB0sS]

Hey,
I have designed a component for J2Me, and here is the paint method:

   
    import javax.microedition.lcdui.Graphics;  
    import javax.microedition.lcdui.Image;  
    class Component {
    ...
	public void paint(Graphics g) {
		if (background != null)
			g.drawImage(image, bounds.getLocation().x, bounds.getLocation().y, 0);
	}
    ...
    }

I want to paint this component on a J2Se application, I tried to paint the component onto a J2Me Image and extracted the int[] into an InputStream, and create a new image on the J2Se platform, with this object:

    public class ComponentStreamer {
    	private Component component;
    	private Image j2Me_Image;
    	
    	public void setComponent(Component component) {
    		this.component = component;
    	}
    	
    	public InputStream getInputStream() throws IOException {
    		if(component==null)
    			return null;
            //THIS LINE THROWS THE EXCEPTION
    		j2Me_Image=Image.createImage(component.getSize().width, component.getSize().height); 
    		component.paint(j2Me_Image.getGraphics());
                return getImageInputStream(j2Me_Image);
    	}
    }

I've tried the Object, but the commented line throws an exception:

    Exception in thread "AWT-EventQueue-0" java.lang.UnsatisfiedLinkError: javax.microedition.lcdui.ImmutableImage.decodeImage([BII)V
    	at javax.microedition.lcdui.ImmutableImage.decodeImage(Native Method)
    	at javax.microedition.lcdui.ImmutableImage.getImageFromStream(Image.java:999)
    	at javax.microedition.lcdui.ImmutableImage.<init>(Image.java:955)
    	at javax.microedition.lcdui.Image.createImage(Image.java:554)

How can over come this error?

[grahamhughes]

Long time, no see!

Without getting all the Java docs out... I seem to remember that you need to use a MemoryImageSource to create an Image from a pixel array.

Graham.

[TacB0sS]

Hey, Graham, How are you man,

It has been really long time...

Thanks again for your help, I'll check this out.

Adam.

[TacB0sS]

Hey Graham,

This Was not what I was looking for, the object you described creates many other things but a javax.microedition.lcdui.Image, I need a simple way to be able to create a javax.microedition.lcdui.Image on a J2Se runtime Environment without running the entire J2Me platform, when I do it with the code I posted in my initial post I get the error I posted "java.lang.UnsatisfiedLinkError".

do you have any other ideas? it is crucial to create a javax.microedition.lcdui.Image!

Thanks,
Adam.

[TacB0sS]

Well, I found a work around.

I added a delegate to my image loading process on the J2Me application, which uses a J2SeImmutableImage from the microemulator 2.0.3, I got it from maven, and I loaded a the image like this:

this is on the J2Me platform, runs both on emulator and J2Se application for loading the images:

public final class PlatformImageLoader {
	public static interface ExternalImageLoader {
		Image loadImage(String filePath);
	}
	private static ExternalImageLoader imageLoader;
	
	public static void setImageLoader(ExternalImageLoader imageLoader) {
		PlatformImageLoader.imageLoader = imageLoader;
	}
	public static final String MaterialDirectory = "/materials";
	public static final Image loadMaterialImage(String path) throws IOException {
		if(imageLoader!=null)
			return imageLoader.loadImage(path);
		InputStream is = PlatformImageLoader.class.getResourceAsStream(MaterialDirectory + path);
		return Image.createImage(is);
	}
}

and here is the delegate to load the images on the J2Se platform:

PlatformImageLoader.setImageLoader(new ExternalImageLoader() {
			
	@Override
	public Image loadImage(String filePath) {
		String fullFilePath = getCurrentProject().getExternalMaterialsDirectory().getFile().getAbsolutePath().replace(File.separator, "/")+filePath;
		File imageFile = new File(fullFilePath);
		J2SEImmutableImage image;
		try {
			image = new J2SEImmutableImage(ImageIO.read(imageFile));
			return image;
		} catch (IOException e) {
			e.printStackTrace();
			throw new J2MeRuntimeException("Unable to load image",e);
		}
	}
});

I'm sure someday someone would thank me for this...

thanks for your help.

[grahamhughes]

Sorry, yes, there is no such class, you have to use a java.awt.Image. You can write your own javax...Image class if you want, to wrap the awt equivalent, if you need source code compatibility with MIDP.

But... you'd figured that out already...