VisClient/org/hfbk/vis/ImageFetcher.java

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/*
 * Created on 20.04.2008
 */
package org.hfbk.vis;

import java.awt.Image;
import java.nio.ByteBuffer;

import org.dronus.gl.Texture;
import org.hfbk.util.Sleeper;
import org.hfbk.vid.AVImageLoader;
import org.lwjgl.opengl.GL11;

public class ImageFetcher extends Thread {

        static final String LIBAV_PATTERN="(?i).*\\.(jpg|jpeg)";
        
        static final int SIMULTANEOUS_FETCH_COUNT = 4;

        static int activeCount = 0;

        String url;

        // public Image image;
        public ByteBuffer pixels;

        public int width, height;
        public int pixelformat;

        boolean thumbnail;
        
        
        AVImageLoader avs;
        
        public ImageFetcher(String url, boolean asThumbnail) {
                super("ImageFetcherThread");
                this.url = url;
                this.thumbnail = asThumbnail;

                setPriority(Thread.MIN_PRIORITY);

                start();
        }

        public void run() {             
                synchronized (ImageFetcher.class) {
                        waitReady();
                        activeCount++;
                }
                //tex=new AVStillPicture().get(imageUrl);
                
                try{
                        deliverImage(url);
                }catch(Exception e){
                        System.out.println("Could not open image "+url);
                        if (Prefs.current.verbose) System.out.println("Reason: "+e.getMessage());
                }
                
                synchronized(ImageFetcher.class){
                        activeCount--;
                        ImageFetcher.class.notify();
                }
        }
        
        void deliverImage(String url) throws Exception{
                
                if (thumbnail){ //check for cached .thumbs/filename thumb
                        Image img=ImageLoader.getDefault().getCachedThumbnail(url);
                        if (img!=null) {
                                deliverImage(img);
                                return;
                        }
                }
                
                if(url.matches(LIBAV_PATTERN)) { //use libav image io
                        avs=new AVImageLoader(url, thumbnail);
                        width=avs.width; height=avs.height;
                        pixelformat=GL11.GL_RGB;
                        
                        pixels=avs.pixels;
                        return;
                }
                
                // use java image io
                if (thumbnail)
                        deliverImage(ImageLoader.getDefault().getThumbnail(url));
                else
                        deliverImage(ImageLoader.getDefault().getImg(url));             
        }
        
        
        void deliverImage(Image img){
                if (img!=null){
                        width=img.getWidth(null); height=img.getHeight(null);
                        pixelformat=GL11.GL_RGBA;
                        pixels=Texture.getImageBuffer(img);
                }
        }       
        
        public void free(){
                if (avs!=null)
                        avs.free();
                avs=null;
        }
        
        public static synchronized void waitReady(){
                while (activeCount > SIMULTANEOUS_FETCH_COUNT)
                        try{
                                ImageFetcher.class.wait();
                        }catch (Exception e) {
                                throw new RuntimeException(e);
                        }
        }
}

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