annotate src/samer/tools/ImageSourceBase.java @ 8:5e3cbbf173aa tip

Reorganise some more

/*
 *	Copyright (c) 2000, Samer Abdallah, King's College London.
 *	All rights reserved.
 *
 *	This software is provided AS iS and WITHOUT ANY WARRANTY;
 *	without even the implied warranty of MERCHANTABILITY or
 *	FITNESS FOR A PARTICULAR PURPOSE.
 */

package samer.tools;
import samer.core.*;
import samer.core.util.*;
import java.awt.image.*;
import java.awt.Color;
import java.util.*;

import java.util.Hashtable;

/**
		<p>
		Base class for image producers. Derived classes
		must do the following:
		<ul>
			<li>	set width and height <b>before<b> any
					consumers are added
			<li>  implement getHints()
			<li>	implement sendPixels(ImageConsumer)
		</ul>

 */

public abstract class ImageSourceBase implements ImageProducer
{
	private		Hashtable			properties = new Hashtable();
	private		Vector				consumers = new Vector();
	protected	IndexColorModel	model = GREY;
	protected	int					width, height;
	protected	IMap					map = new LinearMap(model.getMapSize());

	protected abstract int  getHints();
	protected abstract void sendPixels(ImageConsumer ic);

	public IMap	getMap() { return map; }
	public void	setMap(IMap m) { map=m; m.setIntRange(model.getMapSize()); }

	public int  getWidth() { return width; }
	public int  getHeight() { return height; }
	public void setColorModel(IndexColorModel cm) {
		model=cm; map.setIntRange(model.getMapSize());

		Enumeration cons = consumers.elements();
		while (cons.hasMoreElements()) {
    		ImageConsumer ic = (ImageConsumer)cons.nextElement();
			ic.setColorModel(model);
		}
	}

	public void startProduction(ImageConsumer ic) { addConsumer(ic); }
	public void requestTopDownLeftRightResend(ImageConsumer ic) {}
	public synchronized boolean isConsumer(ImageConsumer ic) { return consumers.contains(ic); }
	public synchronized void removeConsumer(ImageConsumer ic) {	consumers.removeElement(ic); }
	public synchronized void addConsumer(ImageConsumer ic)
	{
		if (consumers.contains(ic)) return;
		consumers.addElement(ic);

		try {
			ic.setDimensions(width, height);
			ic.setProperties(properties);
			ic.setColorModel(model);
			ic.setHints(getHints());
			sendPixels(ic);
			ic.imageComplete( ImageConsumer.SINGLEFRAMEDONE);
		} catch (Exception e) {
			ic.imageComplete(ImageConsumer.IMAGEERROR);
		}
	}


	public void sendPixels()
	{
		Enumeration cons = consumers.elements();
		while (cons.hasMoreElements()) {
    		ImageConsumer ic = (ImageConsumer)cons.nextElement();
			ic.setDimensions(width, height);
			ic.setProperties(properties);
			ic.setColorModel(model);
			ic.setHints(getHints());
			sendPixels(ic);
			ic.imageComplete( ImageConsumer.SINGLEFRAMEDONE);
		}
	}

	public static IndexColorModel	GREY,GREEN;
	static {
		ColorRamp	r = new ColorRamp(256);
		r.gradient(Color.black,Color.white); GREY = r.getColorModel();
	}
}