package com.swtplus.gallery;

import java.io.InputStream;
import java.util.HashMap;
import java.util.Iterator;

import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.widgets.Display;

/**
 * 
 *
 * @author chris
 */
public class GalleryImageRegistry {

    private static HashMap images = new HashMap();
    
    public static Image getImage(Class c,String imageFile){
		Image image = (Image) images.get(imageFile);
		if (image == null) {
			image = getImage(c.getResourceAsStream("images/" + imageFile));

			images.put(imageFile, image);
		}
		return image;
    }
    
	private static Image getImage(InputStream is) {
		Display display = Display.getCurrent();
		ImageData data = new ImageData(is);
		if (data.transparentPixel > 0)
			return new Image(display, data, data.getTransparencyMask());
		return new Image(display, data);
	}
	
	public static void dispose(){
	    for (Iterator iter = images.values().iterator(); iter.hasNext();) {
            Image element = (Image) iter.next();
            element.dispose();           
        }	    
	}
    
}