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/*
* SurfaceManager.java
*
* Created on April 12, 2007, 8:37 AM
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*/
package com.kitfox.salamander.renderer;
import java.awt.AlphaComposite;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.image.BufferedImage;
import java.lang.ref.WeakReference;
import java.util.HashSet;
import java.util.Iterator;
import java.util.TreeSet;
import java.util.WeakHashMap;
/**
*
* @author kitfox
*/
public class SurfaceManager implements Runnable
{
public class SurfaceInfo
{
private BufferedImage image;
private BufImgInfo info;
SurfaceInfo(BufferedImage image, BufImgInfo info)
{
this.image = image;
this.info = info;
}
public BufferedImage getBuffer()
{
return image;
}
/**
* Release resources to be recycled. Do not use the image after calling this.
*/
public void dispose()
{
image = null;
allocatedSurfs.remove(info);
pooledSurfs.add(info);
info.touch();
info = null;
}
}
static class BufImgInfo implements Comparable<BufImgInfo>
{
final int width;
final int height;
final int area;
WeakReference<SurfaceInfo> surfRef;
final BufferedImage image;
long touchTime;
BufImgInfo(BufferedImage image)
{
this.width = image.getWidth();
this.height = image.getHeight();
this.area = width * height;
// ref = new SoftReference(img);
this.image = image;
// this.surfRef = new WeakReference<SurfaceInfo>(null);
}
public void attach(SurfaceInfo surf)
{
surfRef = new WeakReference(surf);
// touch();
}
public int compareTo(SurfaceManager.BufImgInfo obj)
{
return area < obj.area ? -1 : (area > obj.area ? 1 : 0);
}
void touch()
{
touchTime = System.currentTimeMillis();
}
}
private static final SurfaceManager singleton = new SurfaceManager();
TreeSet<BufImgInfo> pooledSurfs = new TreeSet<BufImgInfo>();
HashSet<BufImgInfo> allocatedSurfs = new HashSet<BufImgInfo>();
// WeakHashMap<SurfaceInfo, BufImgInfo> surfaces = new WeakHashMap<SurfaceInfo, BufImgInfo>();
int SWEEP_DELAY = 10000; //Every 10 seconds
/** Creates a new instance of SurfaceManager */
private SurfaceManager()
{
Thread thread = new Thread(this);
thread.setDaemon(true);
thread.start();
}
public static SurfaceManager getDefault()
{
return singleton;
}
/**
* @return a new, cleared temporary surface to render upon. Remember to call
* dispose() on the SurfaceInfo when you're finished with it.
*/
public SurfaceInfo getSurface(int width, int height, GraphicsConfiguration gc)
{
SurfaceInfo surfInfo;
BufImgInfo bufInfo = null;
int targetArea = width * height;
//Search for exising surface
Iterator<BufImgInfo> it = pooledSurfs.iterator();
for (; it.hasNext();)
{
BufImgInfo info = it.next();
if (info.area >= targetArea)
{
if (info.width >= width && info.height >= height)
{
bufInfo = info;
}
break;
}
}
if (bufInfo == null)
{
for (; it.hasNext();)
{
BufImgInfo info = it.next();
if (info.area / 2 <= targetArea)
{
//Do not use exceptionally poorly fit buffers
break;
}
if (info.width >= width && info.height >= height)
{
bufInfo = info;
break;
}
}
}
if (bufInfo != null)
{
//Refurbish
// BufferedImage img = bufInfo.ref.get();
BufferedImage img = bufInfo.image;
Graphics2D g = img.createGraphics();
g.setComposite(AlphaComposite.Clear);
g.fillRect(0, 0, width, height);
g.dispose();
surfInfo = new SurfaceInfo(img.getSubimage(0, 0, width, height), bufInfo);
// surfaces.put(surfInfo, bufInfo);
allocatedSurfs.add(bufInfo);
pooledSurfs.remove(bufInfo);
}
else
{
//Create a new surface
BufferedImage img;
if (gc.getColorModel().hasAlpha())
{
img = gc.createCompatibleImage(width, height);
}
else
{
img = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
}
bufInfo = new BufImgInfo(img);
surfInfo = new SurfaceInfo(img, bufInfo);
// surfaces.put(surfInfo, bufInfo);
allocatedSurfs.add(bufInfo);
}
bufInfo.attach(surfInfo);
return surfInfo;
}
public void run()
{
while (true)
{
/*
//Clean up memory leaked images
for (Iterator<BufImgInfo> it = allocatedSurfs.iterator(); it.hasNext();)
{
BufImgInfo info = it.next();
if (info.surfRef.get() == null)
{
it.remove();
pooledSurfs.add(info);
info.touch();
}
}
*/
//Kill out of date pooled surfaces
long curTime = System.currentTimeMillis();
for (Iterator<BufImgInfo> it = pooledSurfs.iterator(); it.hasNext();)
{
BufImgInfo info = it.next();
if ((curTime - info.touchTime) > SWEEP_DELAY)
{
it.remove();
}
}
try
{
Thread.sleep(1000);
}
catch (InterruptedException ex)
{
ex.printStackTrace();
}
}
}
}
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