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The Kunststoff Look and Feel is an extension to the the Java ™ Metal Look and Feel. This makes it very compact in size (approx. 43 kBytes) and ensures that all the great features provided by the Metal Look and Feel do not get lost. It is our little contribution for making the Java ™ platform even better and we hope that it will help you make some wonderful GUIs.

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package com.incors.plaf;

/*
 * This code was contributed by Sebastian Ferreyra ([email protected]).
 * It is published under the terms of the GNU Lesser General Public License.
 */

import java.awt.PaintContext;
import java.awt.Rectangle;
import java.awt.image.ColorModel;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import java.util.LinkedList;
import java.util.HashMap;
import java.util.WeakHashMap;

class FastGradientPaintContext implements PaintContext {
	private class GradientInfo {
		ColorModel model;
		int parallelLength, startColor, endColor;
		boolean isVertical;
		public boolean equals( Object o ) {
			if ( ! ( o instanceof GradientInfo ) ) return false;
			GradientInfo gi = (GradientInfo) o;
			if ( gi.model.equals(model) && gi.parallelLength == parallelLength && gi.startColor == startColor && gi.endColor == endColor && gi.isVertical == isVertical ) return true;
			return false;
		}
		public int hashCode() {
			return parallelLength;
		}
                public String toString() {
                    return "Direction:" + (isVertical?"ver":"hor") + ", Length: "+Integer.toString( parallelLength )+", Color1: "+Integer.toString( startColor, 16 )+", Color2: "+Integer.toString( endColor, 16 );
                }
	}

	private class Gradient {
		GradientInfo info;
		int perpendicularLength = 0;
		WritableRaster raster;
		HashMap childRasterCache;

		Gradient ( GradientInfo i ) { info = i; }

		private Raster getRaster( int parallelPos, int perpendicularLength, int parallelLength ) {
			if ( raster == null || ( this.perpendicularLength < perpendicularLength ) )  createRaster( perpendicularLength );

			Integer key = new Integer( parallelPos );
			Object o =  childRasterCache.get( key );
			if ( o !=null ) return (Raster) o;
			else {
				Raster r;
				if ( info.isVertical ) r = raster.createChild( 0, parallelPos, this.perpendicularLength, info.parallelLength-parallelPos, 0, 0, null );
				else r = raster.createChild( parallelPos, 0, info.parallelLength-parallelPos, this.perpendicularLength, 0, 0, null );
				childRasterCache.put( key, r );
                                //System.out.println( "Storing child raster in cache. Position: " + Integer.toString(parallelPos) );
				return r;
			}

		}

		public void dispose() {
//			raster = null;
		}

		private void createRaster( int perpendicularLength ) {
			int gradientWidth, gradientHeight;
			if ( info.isVertical ) {
				gradientHeight = info.parallelLength;
				gradientWidth = this.perpendicularLength = perpendicularLength;
			} else {
				gradientWidth = info.parallelLength;
				gradientHeight = this.perpendicularLength = perpendicularLength;
			}

			int sa =	(info.startColor >> 24)	& 0xFF;
			int sr =	(info.startColor >> 16)	& 0xFF;
			int sg =	(info.startColor >>  8)	& 0xFF;
			int sb =	info.startColor		& 0xFF;
			int da =	((info.endColor >> 24)	& 0xFF) - sa;
			int dr =	((info.endColor >> 16)	& 0xFF) - sr;
			int dg =	((info.endColor >>  8)	& 0xFF) - sg;
			int db =	(info.endColor		& 0xFF) - sb;

			raster = info.model.createCompatibleWritableRaster( gradientWidth, gradientHeight );

			Object c = null;
			int pl = info.parallelLength;
			for ( int i = 0 ; i < pl ; i++ ) {
				c = info.model.getDataElements( (sa+(i*da)/pl)<<24 | (sr+(i*dr)/pl)<<16 | (sg+(i*dg)/pl)<<8 | (sb+(i*db)/pl), c );
				for ( int j = 0 ; j < perpendicularLength ; j++ ) {
					if ( info.isVertical ) raster.setDataElements( j, i, c );
					else raster.setDataElements( i, j, c );
				}
			}
			childRasterCache = new HashMap();
		}
	}

	private static WeakHashMap gradientCache = new WeakHashMap();
        private static LinkedList recentInfos = new LinkedList();

	GradientInfo info;
	int parallelDevicePos;
	Gradient gradient;

	FastGradientPaintContext(ColorModel cm, Rectangle r, int sc, int ec, boolean ver ) {
		info = new GradientInfo();
		if ( (((sc & ec)>>24) & 0xFF) != 0xFF  ) info.model = ColorModel.getRGBdefault();
		else info.model = cm;
		info.startColor = sc;
		info.endColor = ec;
		if ( info.isVertical = ver ) {
			parallelDevicePos  = r.y;
			info.parallelLength = r.height;
		} else {
			parallelDevicePos = r.x;
			info.parallelLength = r.width;
		}
                recentInfos.remove( info );
                recentInfos.add( 0, info );
                if ( recentInfos.size() > 16 ) recentInfos.removeLast();
		Object o = gradientCache.get( info );
                if ( o != null ) o = ( ( java.lang.ref.WeakReference )o ).get();
		if ( o != null ) {
			gradient = (Gradient) o;
		} else {
			gradientCache.put( info, new java.lang.ref.WeakReference( gradient = new Gradient( info ) ) );
                        //System.out.println( "Storing gradient in cache. Info: " + info.toString() );
		}
	}

	public void dispose() {
		gradient.dispose();
	}

	public ColorModel getColorModel() {
		return info.model;
	}

	public synchronized Raster getRaster( int x, int y, int w, int h ) {
		if ( info.isVertical ) return gradient.getRaster( y - parallelDevicePos, w, h );
		else return gradient.getRaster( x - parallelDevicePos, h, w );
	}
}