Blend Composite Demo : Composite « 2D Graphics GUI « Java





Blend Composite Demo

Blend Composite Demo
  
 
 


import java.awt.AlphaComposite;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Composite;
import java.awt.CompositeContext;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsEnvironment;
import java.awt.RenderingHints;
import java.awt.Transparency;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.DataBuffer;
import java.awt.image.DirectColorModel;
import java.awt.image.Raster;
import java.awt.image.RasterFormatException;
import java.awt.image.WritableRaster;
import java.io.IOException;
import java.net.URL;

import javax.imageio.ImageIO;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.SwingUtilities;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;


/**
 * See {@link org.jdesktop.swingx.graphics.BlendComposite}.
 *
 * @author Romain Guy <romain.guy@mac.com>
 */
public class BlendCompositeDemo extends JFrame {
    private CompositeTestPanel compositeTestPanel;
    private JComboBox combo;
    private JSlider slider;

    public BlendCompositeDemo() {
        super("Blend Composites");

        compositeTestPanel = new CompositeTestPanel();
        compositeTestPanel.setComposite(BlendComposite.Average);
        add(compositeTestPanel);

        combo = new JComboBox(BlendComposite.BlendingMode.values());
        combo.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                compositeTestPanel.setComposite(
                    BlendComposite.getInstance(
                        BlendComposite.BlendingMode.valueOf(combo.getSelectedItem().toString()),
                        slider.getValue() / 100.0f
                    ));
            }
        });

        slider = new JSlider(0, 100, 100);
        slider.addChangeListener(new ChangeListener() {
            public void stateChanged(ChangeEvent e) {
                BlendComposite blend = (BlendComposite) compositeTestPanel.getComposite();
                blend = blend.derive(slider.getValue() / 100.0f);
                compositeTestPanel.setComposite(blend);
            }
        });

        JPanel controls = new JPanel(new FlowLayout(FlowLayout.LEFT));
        controls.add(combo);
        controls.add(new JLabel("0%"));
        controls.add(slider);
        controls.add(new JLabel("100%"));
        add(controls, BorderLayout.SOUTH);

        pack();
        setLocationRelativeTo(null);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    private static class CompositeTestPanel extends JPanel {
        private BufferedImage image = null;
        private Composite composite = AlphaComposite.Src;
        private BufferedImage imageA;
        private BufferedImage imageB;
        private boolean repaint = false;

        public CompositeTestPanel() {
            setOpaque(false);
            try {
                imageA = GraphicsUtilities.loadCompatibleImage(getClass().getResource("A.jpg"));
                imageB = GraphicsUtilities.loadCompatibleImage(getClass().getResource("B.jpg"));
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(imageA.getWidth(), imageA.getHeight());
        }

        @Override
        protected void paintComponent(Graphics g) {
            if (image == null) {
                image = new BufferedImage(imageA.getWidth(),
                                          imageA.getHeight(),
                                          BufferedImage.TYPE_INT_ARGB);
                repaint = true;
            }

            if (repaint) {
                Graphics2D g2 = image.createGraphics();
                g2.setComposite(AlphaComposite.Clear);
                g2.fillRect(0, 0, image.getWidth(), image.getHeight());

                g2.setComposite(AlphaComposite.Src);
                g2.drawImage(imageA, 0, 0, null);
                g2.setComposite(getComposite());
                g2.drawImage(imageB, 0, 0, null);
                g2.dispose();

                repaint = false;
            }

            int x = (getWidth() - image.getWidth()) / 2;
            int y = (getHeight() - image.getHeight()) / 2;
            g.drawImage(image, x, y, null);
        }

        public void setComposite(Composite composite) {
            if (composite != null) {
                this.composite = composite;
                this.repaint = true;
                repaint();
            }
        }

        public Composite getComposite() {
            return this.composite;
        }
    }

    public static void main(String... args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new BlendCompositeDemo().setVisible(true);
            }
        });
    }
}


/*
 * $Id: BlendComposite.java,v 1.9 2007/02/28 01:21:29 gfx Exp $
 *
 * Dual-licensed under LGPL (Sun and Romain Guy) and BSD (Romain Guy).
 *
 * Copyright 2005 Sun Microsystems, Inc., 4150 Network Circle,
 * Santa Clara, California 95054, U.S.A. All rights reserved.
 *
 * Copyright (c) 2006 Romain Guy <romain.guy@mac.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */



/**
 * <p>A blend composite defines the rule according to which a drawing primitive
 * (known as the source) is mixed with existing graphics (know as the
 * destination.)</p>
 * <p><code>BlendComposite</code> is an implementation of the
 * {@link java.awt.Composite} interface and must therefore be set as a state on
 * a {@link java.awt.Graphics2D} surface.</p>
 * <p>Please refer to {@link java.awt.Graphics2D#setComposite(java.awt.Composite)}
 * for more information on how to use this class with a graphics surface.</p>
 * <h2>Blending Modes</h2>
 * <p>This class offers a certain number of blending modes, or compositing
 * rules. These rules are inspired from graphics editing software packages,
 * like <em>Adobe Photoshop</em> or <em>The GIMP</em>.</p>
 * <p>Given the wide variety of implemented blending modes and the difficulty
 * to describe them with words, please refer to those tools to visually see
 * the result of these blending modes.</p>
 * <h2>Opacity</h2>
 * <p>Each blending mode has an associated opacity, defined as a float value
 * between 0.0 and 1.0. Changing the opacity controls the force with which the
 * compositing operation is applied. For instance, a composite with an opacity
 * of 0.0 will not draw the source onto the destination. With an opacity of
 * 1.0, the source will be fully drawn onto the destination, according to the
 * selected blending mode rule.</p>
 * <p>The opacity, or alpha value, is used by the composite instance to mutiply
 * the alpha value of each pixel of the source when being composited over the
 * destination.</p>
 * <h2>Creating a Blend Composite</h2>
 * <p>Blend composites can be created in various manners:</p>
 * <ul>
 *   <li>Use one of the pre-defined instance. Example:
 *     <code>BlendComposite.Average</code>.</li>
 *   <li>Derive one of the pre-defined instances by calling
 *     {@link #derive(float)} or {@link #derive(BlendingMode)}. Deriving allows
 *     you to change either the opacity or the blending mode. Example:
 *     <code>BlendComposite.Average.derive(0.5f)</code>.</li>
 *   <li>Use a factory method: {@link #getInstance(BlendingMode)} or
 *     {@link #getInstance(BlendingMode, float)}.</li>
 * </ul>
 * <h2>Implementation Caveat</h2>
 * <p>TThe blending mode <em>SoftLight</em> has not been implemented yet.</p>
 *
 * @see java.awt.Graphics2D
 * @see java.awt.Composite
 * @see java.awt.AlphaComposite
 * @author Romain Guy <romain.guy@mac.com>
 */
 final class BlendComposite implements Composite {
    /**
     * <p>A blending mode defines the compositing rule of a
     * {@link BlendComposite}.</p>
     *
     * @author Romain Guy <romain.guy@mac.com>
     */
    public enum BlendingMode {
        AVERAGE,
        MULTIPLY,
        SCREEN,
        DARKEN,
        LIGHTEN,
        OVERLAY,
        HARD_LIGHT,
        SOFT_LIGHT,
        DIFFERENCE,
        NEGATION,
        EXCLUSION,
        COLOR_DODGE,
        INVERSE_COLOR_DODGE,
        SOFT_DODGE,
        COLOR_BURN,
        INVERSE_COLOR_BURN,
        SOFT_BURN,
        REFLECT,
        GLOW,
        FREEZE,
        HEAT,
        ADD,
        SUBTRACT,
        STAMP,
        RED,
        GREEN,
        BLUE,
        HUE,
        SATURATION,
        COLOR,
        LUMINOSITY
    }

    public static final BlendComposite Average = new BlendComposite(BlendingMode.AVERAGE);
    public static final BlendComposite Multiply = new BlendComposite(BlendingMode.MULTIPLY);
    public static final BlendComposite Screen = new BlendComposite(BlendingMode.SCREEN);
    public static final BlendComposite Darken = new BlendComposite(BlendingMode.DARKEN);
    public static final BlendComposite Lighten = new BlendComposite(BlendingMode.LIGHTEN);
    public static final BlendComposite Overlay = new BlendComposite(BlendingMode.OVERLAY);
    public static final BlendComposite HardLight = new BlendComposite(BlendingMode.HARD_LIGHT);
    public static final BlendComposite SoftLight = new BlendComposite(BlendingMode.SOFT_LIGHT);
    public static final BlendComposite Difference = new BlendComposite(BlendingMode.DIFFERENCE);
    public static final BlendComposite Negation = new BlendComposite(BlendingMode.NEGATION);
    public static final BlendComposite Exclusion = new BlendComposite(BlendingMode.EXCLUSION);
    public static final BlendComposite ColorDodge = new BlendComposite(BlendingMode.COLOR_DODGE);
    public static final BlendComposite InverseColorDodge = new BlendComposite(BlendingMode.INVERSE_COLOR_DODGE);
    public static final BlendComposite SoftDodge = new BlendComposite(BlendingMode.SOFT_DODGE);
    public static final BlendComposite ColorBurn = new BlendComposite(BlendingMode.COLOR_BURN);
    public static final BlendComposite InverseColorBurn = new BlendComposite(BlendingMode.INVERSE_COLOR_BURN);
    public static final BlendComposite SoftBurn = new BlendComposite(BlendingMode.SOFT_BURN);
    public static final BlendComposite Reflect = new BlendComposite(BlendingMode.REFLECT);
    public static final BlendComposite Glow = new BlendComposite(BlendingMode.GLOW);
    public static final BlendComposite Freeze = new BlendComposite(BlendingMode.FREEZE);
    public static final BlendComposite Heat = new BlendComposite(BlendingMode.HEAT);
    public static final BlendComposite Add = new BlendComposite(BlendingMode.ADD);
    public static final BlendComposite Subtract = new BlendComposite(BlendingMode.SUBTRACT);
    public static final BlendComposite Stamp = new BlendComposite(BlendingMode.STAMP);
    public static final BlendComposite Red = new BlendComposite(BlendingMode.RED);
    public static final BlendComposite Green = new BlendComposite(BlendingMode.GREEN);
    public static final BlendComposite Blue = new BlendComposite(BlendingMode.BLUE);
    public static final BlendComposite Hue = new BlendComposite(BlendingMode.HUE);
    public static final BlendComposite Saturation = new BlendComposite(BlendingMode.SATURATION);
    public static final BlendComposite Color = new BlendComposite(BlendingMode.COLOR);
    public static final BlendComposite Luminosity = new BlendComposite(BlendingMode.LUMINOSITY);

    private final float alpha;
    private final BlendingMode mode;

    private BlendComposite(BlendingMode mode) {
        this(mode, 1.0f);
    }

    private BlendComposite(BlendingMode mode, float alpha) {
        this.mode = mode;

        if (alpha < 0.0f || alpha > 1.0f) {
            throw new IllegalArgumentException(
                    "alpha must be comprised between 0.0f and 1.0f");
        }
        this.alpha = alpha;
    }

    /**
     * <p>Creates a new composite based on the blending mode passed
     * as a parameter. A default opacity of 1.0 is applied.</p>
     *
     * @param mode the blending mode defining the compositing rule
     * @return a new <code>BlendComposite</code> based on the selected blending
     *   mode, with an opacity of 1.0
     */
    public static BlendComposite getInstance(BlendingMode mode) {
        return new BlendComposite(mode);
    }

    /**
     * <p>Creates a new composite based on the blending mode and opacity passed
     * as parameters. The opacity must be a value between 0.0 and 1.0.</p>
     *
     * @param mode the blending mode defining the compositing rule
     * @param alpha the constant alpha to be multiplied with the alpha of the
     *   source. <code>alpha</code> must be a floating point between 0.0 and 1.0.
     * @throws IllegalArgumentException if the opacity is less than 0.0 or
     *   greater than 1.0
     * @return a new <code>BlendComposite</code> based on the selected blending
     *   mode and opacity
     */
    public static BlendComposite getInstance(BlendingMode mode, float alpha) {
        return new BlendComposite(mode, alpha);
    }

    /**
     * <p>Returns a <code>BlendComposite</code> object that uses the specified
     * blending mode and this object's alpha value. If the newly specified
     * blending mode is the same as this object's, this object is returned.</p>
     *
     * @param mode the blending mode defining the compositing rule
     * @return a <code>BlendComposite</code> object derived from this object,
     *   that uses the specified blending mode
     */
    public BlendComposite derive(BlendingMode mode) {
        return this.mode == mode ? this : new BlendComposite(mode, getAlpha());
    }

    /**
     * <p>Returns a <code>BlendComposite</code> object that uses the specified
     * opacity, or alpha, and this object's blending mode. If the newly specified
     * opacity is the same as this object's, this object is returned.</p>
     *
     * @param alpha the constant alpha to be multiplied with the alpha of the
     *   source. <code>alpha</code> must be a floating point between 0.0 and 1.0.
     * @throws IllegalArgumentException if the opacity is less than 0.0 or
     *   greater than 1.0
     * @return a <code>BlendComposite</code> object derived from this object,
     *   that uses the specified blending mode
     */
    public BlendComposite derive(float alpha) {
        return this.alpha == alpha ? this : new BlendComposite(getMode(), alpha);
    }

    /**
     * <p>Returns the opacity of this composite. If no opacity has been defined,
     * 1.0 is returned.</p>
     *
     * @return the alpha value, or opacity, of this object
     */
    public float getAlpha() {
        return alpha;
    }

    /**
     * <p>Returns the blending mode of this composite.</p>
     *
     * @return the blending mode used by this object
     */
    public BlendingMode getMode() {
        return mode;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public int hashCode() {
        return Float.floatToIntBits(alpha) * 31 + mode.ordinal();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean equals(Object obj) {
        if (!(obj instanceof BlendComposite)) {
            return false;
        }

        BlendComposite bc = (BlendComposite) obj;
        return mode == bc.mode && alpha == bc.alpha;
    }

    private static boolean checkComponentsOrder(ColorModel cm) {
        if (cm instanceof DirectColorModel &&
                cm.getTransferType() == DataBuffer.TYPE_INT) {
            DirectColorModel directCM = (DirectColorModel) cm;
            
            return directCM.getRedMask() == 0x00FF0000 &&
                   directCM.getGreenMask() == 0x0000FF00 &&
                   directCM.getBlueMask() == 0x000000FF &&
                   (directCM.getNumComponents() != 4 ||
                    directCM.getAlphaMask() == 0xFF000000);
        }
        
        return false;
    }
    
    /**
     * {@inheritDoc}
     */
    public CompositeContext createContext(ColorModel srcColorModel,
                                          ColorModel dstColorModel,
                                          RenderingHints hints) {
        if (!checkComponentsOrder(srcColorModel) ||
                !checkComponentsOrder(dstColorModel)) {
            throw new RasterFormatException("Incompatible color models");
        }
        
        return new BlendingContext(this);
    }

    private static final class BlendingContext implements CompositeContext {
        private final Blender blender;
        private final BlendComposite composite;

        private BlendingContext(BlendComposite composite) {
            this.composite = composite;
            this.blender = Blender.getBlenderFor(composite);
        }

        public void dispose() {
        }

        public void compose(Raster src, Raster dstIn, WritableRaster dstOut) {
            int width = Math.min(src.getWidth(), dstIn.getWidth());
            int height = Math.min(src.getHeight(), dstIn.getHeight());

            float alpha = composite.getAlpha();

            int[] result = new int[4];
            int[] srcPixel = new int[4];
            int[] dstPixel = new int[4];
            int[] srcPixels = new int[width];
            int[] dstPixels = new int[width];

            for (int y = 0; y < height; y++) {
                src.getDataElements(0, y, width, 1, srcPixels);
                dstIn.getDataElements(0, y, width, 1, dstPixels);
                for (int x = 0; x < width; x++) {
                    // pixels are stored as INT_ARGB
                    // our arrays are [R, G, B, A]
                    int pixel = srcPixels[x];
                    srcPixel[0] = (pixel >> 16) & 0xFF;
                    srcPixel[1] = (pixel >>  8) & 0xFF;
                    srcPixel[2] = (pixel      ) & 0xFF;
                    srcPixel[3] = (pixel >> 24) & 0xFF;

                    pixel = dstPixels[x];
                    dstPixel[0] = (pixel >> 16) & 0xFF;
                    dstPixel[1] = (pixel >>  8) & 0xFF;
                    dstPixel[2] = (pixel      ) & 0xFF;
                    dstPixel[3] = (pixel >> 24) & 0xFF;

                    blender.blend(srcPixel, dstPixel, result);

                    // mixes the result with the opacity
                    dstPixels[x] = ((int) (dstPixel[3] + (result[3] - dstPixel[3]) * alpha) & 0xFF) << 24 |
                                   ((int) (dstPixel[0] + (result[0] - dstPixel[0]) * alpha) & 0xFF) << 16 |
                                   ((int) (dstPixel[1] + (result[1] - dstPixel[1]) * alpha) & 0xFF) <<  8 |
                                    (int) (dstPixel[2] + (result[2] - dstPixel[2]) * alpha) & 0xFF;
                }
                dstOut.setDataElements(0, y, width, 1, dstPixels);
            }
        }
    }

    private static abstract class Blender {
        public abstract void blend(int[] src, int[] dst, int[] result);

        public static Blender getBlenderFor(BlendComposite composite) {
            switch (composite.getMode()) {
                case ADD:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = Math.min(255, src[0] + dst[0]);
                            result[1] = Math.min(255, src[1] + dst[1]);
                            result[2] = Math.min(255, src[2] + dst[2]);
                            result[3] = Math.min(255, src[3] + dst[3]);
                        }
                    };
                case AVERAGE:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = (src[0] + dst[0]) >> 1;
                            result[1] = (src[1] + dst[1]) >> 1;
                            result[2] = (src[2] + dst[2]) >> 1;
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case BLUE:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = dst[0];
                            result[1] = src[1];
                            result[2] = dst[2];
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case COLOR:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            float[] srcHSL = new float[3];
                            ColorUtilities.RGBtoHSL(src[0], src[1], src[2], srcHSL);
                            float[] dstHSL = new float[3];
                            ColorUtilities.RGBtoHSL(dst[0], dst[1], dst[2], dstHSL);

                            ColorUtilities.HSLtoRGB(srcHSL[0], srcHSL[1], dstHSL[2], result);
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case COLOR_BURN:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = src[0] == 0 ? 0 :
                                Math.max(0, 255 - (((255 - dst[0]) << 8) / src[0]));
                            result[1] = src[1] == 0 ? 0 :
                                Math.max(0, 255 - (((255 - dst[1]) << 8) / src[1]));
                            result[2] = src[2] == 0 ? 0 :
                                Math.max(0, 255 - (((255 - dst[2]) << 8) / src[2]));
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case COLOR_DODGE:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = src[0] == 255 ? 255 :
                                Math.min((dst[0] << 8) / (255 - src[0]), 255);
                            result[1] = src[1] == 255 ? 255 :
                                Math.min((dst[1] << 8) / (255 - src[1]), 255);
                            result[2] = src[2] == 255 ? 255 :
                                Math.min((dst[2] << 8) / (255 - src[2]), 255);
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case DARKEN:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = Math.min(src[0], dst[0]);
                            result[1] = Math.min(src[1], dst[1]);
                            result[2] = Math.min(src[2], dst[2]);
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case DIFFERENCE:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = Math.abs(dst[0] - src[0]);
                            result[1] = Math.abs(dst[1] - src[1]);
                            result[2] = Math.abs(dst[2] - src[2]);
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case EXCLUSION:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = dst[0] + src[0] - (dst[0] * src[0] >> 7);
                            result[1] = dst[1] + src[1] - (dst[1] * src[1] >> 7);
                            result[2] = dst[2] + src[2] - (dst[2] * src[2] >> 7);
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case FREEZE:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = src[0] == 0 ? 0 :
                                Math.max(0, 255 - (255 - dst[0]) * (255 - dst[0]) / src[0]);
                            result[1] = src[1] == 0 ? 0 :
                                Math.max(0, 255 - (255 - dst[1]) * (255 - dst[1]) / src[1]);
                            result[2] = src[2] == 0 ? 0 :
                                Math.max(0, 255 - (255 - dst[2]) * (255 - dst[2]) / src[2]);
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case GLOW:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = dst[0] == 255 ? 255 :
                                Math.min(255, src[0] * src[0] / (255 - dst[0]));
                            result[1] = dst[1] == 255 ? 255 :
                                Math.min(255, src[1] * src[1] / (255 - dst[1]));
                            result[2] = dst[2] == 255 ? 255 :
                                Math.min(255, src[2] * src[2] / (255 - dst[2]));
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case GREEN:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = dst[0];
                            result[1] = dst[1];
                            result[2] = src[2];
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case HARD_LIGHT:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = src[0] < 128 ? dst[0] * src[0] >> 7 :
                                255 - ((255 - src[0]) * (255 - dst[0]) >> 7);
                            result[1] = src[1] < 128 ? dst[1] * src[1] >> 7 :
                                255 - ((255 - src[1]) * (255 - dst[1]) >> 7);
                            result[2] = src[2] < 128 ? dst[2] * src[2] >> 7 :
                                255 - ((255 - src[2]) * (255 - dst[2]) >> 7);
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case HEAT:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = dst[0] == 0 ? 0 :
                                Math.max(0, 255 - (255 - src[0]) * (255 - src[0]) / dst[0]);
                            result[1] = dst[1] == 0 ? 0 :
                                Math.max(0, 255 - (255 - src[1]) * (255 - src[1]) / dst[1]);
                            result[2] = dst[2] == 0 ? 0 :
                                Math.max(0, 255 - (255 - src[2]) * (255 - src[2]) / dst[2]);
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case HUE:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            float[] srcHSL = new float[3];
                            ColorUtilities.RGBtoHSL(src[0], src[1], src[2], srcHSL);
                            float[] dstHSL = new float[3];
                            ColorUtilities.RGBtoHSL(dst[0], dst[1], dst[2], dstHSL);

                            ColorUtilities.HSLtoRGB(srcHSL[0], dstHSL[1], dstHSL[2], result);
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case INVERSE_COLOR_BURN:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = dst[0] == 0 ? 0 :
                                Math.max(0, 255 - (((255 - src[0]) << 8) / dst[0]));
                            result[1] = dst[1] == 0 ? 0 :
                                Math.max(0, 255 - (((255 - src[1]) << 8) / dst[1]));
                            result[2] = dst[2] == 0 ? 0 :
                                Math.max(0, 255 - (((255 - src[2]) << 8) / dst[2]));
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case INVERSE_COLOR_DODGE:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = dst[0] == 255 ? 255 :
                                Math.min((src[0] << 8) / (255 - dst[0]), 255);
                            result[1] = dst[1] == 255 ? 255 :
                                Math.min((src[1] << 8) / (255 - dst[1]), 255);
                            result[2] = dst[2] == 255 ? 255 :
                                Math.min((src[2] << 8) / (255 - dst[2]), 255);
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case LIGHTEN:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = Math.max(src[0], dst[0]);
                            result[1] = Math.max(src[1], dst[1]);
                            result[2] = Math.max(src[2], dst[2]);
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case LUMINOSITY:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            float[] srcHSL = new float[3];
                            ColorUtilities.RGBtoHSL(src[0], src[1], src[2], srcHSL);
                            float[] dstHSL = new float[3];
                            ColorUtilities.RGBtoHSL(dst[0], dst[1], dst[2], dstHSL);

                            ColorUtilities.HSLtoRGB(dstHSL[0], dstHSL[1], srcHSL[2], result);
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case MULTIPLY:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = (src[0] * dst[0]) >> 8;
                            result[1] = (src[1] * dst[1]) >> 8;
                            result[2] = (src[2] * dst[2]) >> 8;
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case NEGATION:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = 255 - Math.abs(255 - dst[0] - src[0]);
                            result[1] = 255 - Math.abs(255 - dst[1] - src[1]);
                            result[2] = 255 - Math.abs(255 - dst[2] - src[2]);
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case OVERLAY:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = dst[0] < 128 ? dst[0] * src[0] >> 7 :
                                255 - ((255 - dst[0]) * (255 - src[0]) >> 7);
                            result[1] = dst[1] < 128 ? dst[1] * src[1] >> 7 :
                                255 - ((255 - dst[1]) * (255 - src[1]) >> 7);
                            result[2] = dst[2] < 128 ? dst[2] * src[2] >> 7 :
                                255 - ((255 - dst[2]) * (255 - src[2]) >> 7);
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case RED:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = src[0];
                            result[1] = dst[1];
                            result[2] = dst[2];
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case REFLECT:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = src[0] == 255 ? 255 :
                                Math.min(255, dst[0] * dst[0] / (255 - src[0]));
                            result[1] = src[1] == 255 ? 255 :
                                Math.min(255, dst[1] * dst[1] / (255 - src[1]));
                            result[2] = src[2] == 255 ? 255 :
                                Math.min(255, dst[2] * dst[2] / (255 - src[2]));
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case SATURATION:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            float[] srcHSL = new float[3];
                            ColorUtilities.RGBtoHSL(src[0], src[1], src[2], srcHSL);
                            float[] dstHSL = new float[3];
                            ColorUtilities.RGBtoHSL(dst[0], dst[1], dst[2], dstHSL);

                            ColorUtilities.HSLtoRGB(dstHSL[0], srcHSL[1], dstHSL[2], result);
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case SCREEN:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = 255 - ((255 - src[0]) * (255 - dst[0]) >> 8);
                            result[1] = 255 - ((255 - src[1]) * (255 - dst[1]) >> 8);
                            result[2] = 255 - ((255 - src[2]) * (255 - dst[2]) >> 8);
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case SOFT_BURN:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = dst[0] + src[0] < 256 ?
                                (dst[0] == 255 ? 255 :
                                 Math.min(255, (src[0] << 7) / (255 - dst[0]))) :
                                                                                Math.max(0, 255 - (((255 - dst[0]) << 7) / src[0]));
                            result[1] = dst[1] + src[1] < 256 ?
                                (dst[1] == 255 ? 255 :
                                 Math.min(255, (src[1] << 7) / (255 - dst[1]))) :
                                                                                Math.max(0, 255 - (((255 - dst[1]) << 7) / src[1]));
                            result[2] = dst[2] + src[2] < 256 ?
                                (dst[2] == 255 ? 255 :
                                 Math.min(255, (src[2] << 7) / (255 - dst[2]))) :
                                                                                Math.max(0, 255 - (((255 - dst[2]) << 7) / src[2]));
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case SOFT_DODGE:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = dst[0] + src[0] < 256 ?
                                (src[0] == 255 ? 255 :
                                 Math.min(255, (dst[0] << 7) / (255 - src[0]))) :
                                    Math.max(0, 255 - (((255 - src[0]) << 7) / dst[0]));
                            result[1] = dst[1] + src[1] < 256 ?
                                (src[1] == 255 ? 255 :
                                 Math.min(255, (dst[1] << 7) / (255 - src[1]))) :
                                    Math.max(0, 255 - (((255 - src[1]) << 7) / dst[1]));
                            result[2] = dst[2] + src[2] < 256 ?
                                (src[2] == 255 ? 255 :
                                 Math.min(255, (dst[2] << 7) / (255 - src[2]))) :
                                    Math.max(0, 255 - (((255 - src[2]) << 7) / dst[2]));
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case SOFT_LIGHT:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            int mRed = src[0] * dst[0] / 255;
                            int mGreen = src[1] * dst[1] / 255;
                            int mBlue = src[2] * dst[2] / 255;
                            result[0] = mRed + src[0] * (255 - ((255 - src[0]) * (255 - dst[0]) / 255) - mRed) / 255;
                            result[1] = mGreen + src[1] * (255 - ((255 - src[1]) * (255 - dst[1]) / 255) - mGreen) / 255;
                            result[2] = mBlue + src[2] * (255 - ((255 - src[2]) * (255 - dst[2]) / 255) - mBlue) / 255;
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case STAMP:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = Math.max(0, Math.min(255, dst[0] + 2 * src[0] - 256));
                            result[1] = Math.max(0, Math.min(255, dst[1] + 2 * src[1] - 256));
                            result[2] = Math.max(0, Math.min(255, dst[2] + 2 * src[2] - 256));
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
                case SUBTRACT:
                    return new Blender() {
                        @Override
                        public void blend(int[] src, int[] dst, int[] result) {
                            result[0] = Math.max(0, src[0] + dst[0] - 256);
                            result[1] = Math.max(0, src[1] + dst[1] - 256);
                            result[2] = Math.max(0, src[2] + dst[2] - 256);
                            result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
                        }
                    };
            }
            throw new IllegalArgumentException("Blender not implemented for " +
                                               composite.getMode().name());
        }
    }
}

/*
 * $Id: GraphicsUtilities.java,v 1.1 2006/12/15 13:53:13 gfx Exp $
 *
 * Dual-licensed under LGPL (Sun and Romain Guy) and BSD (Romain Guy).
 *
 * Copyright 2005 Sun Microsystems, Inc., 4150 Network Circle,
 * Santa Clara, California 95054, U.S.A. All rights reserved.
 *
 * Copyright (c) 2006 Romain Guy <romain.guy@mac.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */



/**
 * <p><code>GraphicsUtilities</code> contains a set of tools to perform
 * common graphics operations easily. These operations are divided into
 * several themes, listed below.</p>
 * <h2>Compatible Images</h2>
 * <p>Compatible images can, and should, be used to increase drawing
 * performance. This class provides a number of methods to load compatible
 * images directly from files or to convert existing images to compatibles
 * images.</p>
 * <h2>Creating Thumbnails</h2>
 * <p>This class provides a number of methods to easily scale down images.
 * Some of these methods offer a trade-off between speed and result quality and
 * shouuld be used all the time. They also offer the advantage of producing
 * compatible images, thus automatically resulting into better runtime
 * performance.</p>
 * <p>All these methodes are both faster than
 * {@link java.awt.Image#getScaledInstance(int, int, int)} and produce
 * better-looking results than the various <code>drawImage()</code> methods
 * in {@link java.awt.Graphics}, which can be used for image scaling.</p>
 * <h2>Image Manipulation</h2>
 * <p>This class provides two methods to get and set pixels in a buffered image.
 * These methods try to avoid unmanaging the image in order to keep good
 * performance.</p>
 *
 * @author Romain Guy <romain.guy@mac.com>
 */
 class GraphicsUtilities {
    private static final GraphicsConfiguration CONFIGURATION =
            GraphicsEnvironment.getLocalGraphicsEnvironment().
                    getDefaultScreenDevice().getDefaultConfiguration();

    private GraphicsUtilities() {
    }

    /**
     * <p>Returns a new <code>BufferedImage</code> using the same color model
     * as the image passed as a parameter. The returned image is only compatible
     * with the image passed as a parameter. This does not mean the returned
     * image is compatible with the hardware.</p>
     *
     * @param image the reference image from which the color model of the new
     *   image is obtained
     * @return a new <code>BufferedImage</code>, compatible with the color model
     *   of <code>image</code>
     */
    public static BufferedImage createColorModelCompatibleImage(BufferedImage image) {
        ColorModel cm = image.getColorModel();
        return new BufferedImage(cm,
            cm.createCompatibleWritableRaster(image.getWidth(),
                                              image.getHeight()),
            cm.isAlphaPremultiplied(), null);
    }

    /**
     * <p>Returns a new compatible image with the same width, height and
     * transparency as the image specified as a parameter.</p>
     *
     * @see java.awt.Transparency
     * @see #createCompatibleImage(int, int)
     * @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
     * @see #createTranslucentCompatibleImage(int, int)
     * @see #loadCompatibleImage(java.net.URL)
     * @see #toCompatibleImage(java.awt.image.BufferedImage)
     * @param image the reference image from which the dimension and the
     *   transparency of the new image are obtained
     * @return a new compatible <code>BufferedImage</code> with the same
     *   dimension and transparency as <code>image</code>
     */
    public static BufferedImage createCompatibleImage(BufferedImage image) {
        return createCompatibleImage(image, image.getWidth(), image.getHeight());
    }

    /**
     * <p>Returns a new compatible image of the specified width and height, and
     * the same transparency setting as the image specified as a parameter.</p>
     *
     * @see java.awt.Transparency
     * @see #createCompatibleImage(java.awt.image.BufferedImage)
     * @see #createCompatibleImage(int, int)
     * @see #createTranslucentCompatibleImage(int, int)
     * @see #loadCompatibleImage(java.net.URL)
     * @see #toCompatibleImage(java.awt.image.BufferedImage)
     * @param width the width of the new image
     * @param height the height of the new image
     * @param image the reference image from which the transparency of the new
     *   image is obtained
     * @return a new compatible <code>BufferedImage</code> with the same
     *   transparency as <code>image</code> and the specified dimension
     */
    public static BufferedImage createCompatibleImage(BufferedImage image,
                                                      int width, int height) {
        return CONFIGURATION.createCompatibleImage(width, height,
                                                   image.getTransparency());
    }

    /**
     * <p>Returns a new opaque compatible image of the specified width and
     * height.</p>
     *
     * @see #createCompatibleImage(java.awt.image.BufferedImage)
     * @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
     * @see #createTranslucentCompatibleImage(int, int)
     * @see #loadCompatibleImage(java.net.URL)
     * @see #toCompatibleImage(java.awt.image.BufferedImage)
     * @param width the width of the new image
     * @param height the height of the new image
     * @return a new opaque compatible <code>BufferedImage</code> of the
     *   specified width and height
     */
    public static BufferedImage createCompatibleImage(int width, int height) {
        return CONFIGURATION.createCompatibleImage(width, height);
    }

    /**
     * <p>Returns a new translucent compatible image of the specified width
     * and height.</p>
     *
     * @see #createCompatibleImage(java.awt.image.BufferedImage)
     * @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
     * @see #createCompatibleImage(int, int)
     * @see #loadCompatibleImage(java.net.URL)
     * @see #toCompatibleImage(java.awt.image.BufferedImage)
     * @param width the width of the new image
     * @param height the height of the new image
     * @return a new translucent compatible <code>BufferedImage</code> of the
     *   specified width and height
     */
    public static BufferedImage createTranslucentCompatibleImage(int width,
                                                                 int height) {
        return CONFIGURATION.createCompatibleImage(width, height,
                                                   Transparency.TRANSLUCENT);
    }

    /**
     * <p>Returns a new compatible image from a URL. The image is loaded from the
     * specified location and then turned, if necessary into a compatible
     * image.</p>
     *
     * @see #createCompatibleImage(java.awt.image.BufferedImage)
     * @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
     * @see #createCompatibleImage(int, int)
     * @see #createTranslucentCompatibleImage(int, int)
     * @see #toCompatibleImage(java.awt.image.BufferedImage)
     * @param resource the URL of the picture to load as a compatible image
     * @return a new translucent compatible <code>BufferedImage</code> of the
     *   specified width and height
     * @throws java.io.IOException if the image cannot be read or loaded
     */
    public static BufferedImage loadCompatibleImage(URL resource)
            throws IOException {
        BufferedImage image = ImageIO.read(resource);
        return toCompatibleImage(image);
    }

    /**
     * <p>Return a new compatible image that contains a copy of the specified
     * image. This method ensures an image is compatible with the hardware,
     * and therefore optimized for fast blitting operations.</p>
     *
     * @see #createCompatibleImage(java.awt.image.BufferedImage)
     * @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
     * @see #createCompatibleImage(int, int)
     * @see #createTranslucentCompatibleImage(int, int)
     * @see #loadCompatibleImage(java.net.URL)
     * @param image the image to copy into a new compatible image
     * @return a new compatible copy, with the
     *   same width and height and transparency and content, of <code>image</code>
     */
    public static BufferedImage toCompatibleImage(BufferedImage image) {
        if (image.getColorModel().equals(CONFIGURATION.getColorModel())) {
            return image;
        }

        BufferedImage compatibleImage = CONFIGURATION.createCompatibleImage(
                image.getWidth(), image.getHeight(), image.getTransparency());
        Graphics g = compatibleImage.getGraphics();
        g.drawImage(image, 0, 0, null);
        g.dispose();

        return compatibleImage;
    }

    /**
     * <p>Returns a thumbnail of a source image. <code>newSize</code> defines
     * the length of the longest dimension of the thumbnail. The other
     * dimension is then computed according to the dimensions ratio of the
     * original picture.</p>
     * <p>This method favors speed over quality. When the new size is less than
     * half the longest dimension of the source image,
     * {@link #createThumbnail(BufferedImage, int)} or
     * {@link #createThumbnail(BufferedImage, int, int)} should be used instead
     * to ensure the quality of the result without sacrificing too much
     * performance.</p>
     *
     * @see #createThumbnailFast(java.awt.image.BufferedImage, int, int)
     * @see #createThumbnail(java.awt.image.BufferedImage, int)
     * @see #createThumbnail(java.awt.image.BufferedImage, int, int)
     * @param image the source image
     * @param newSize the length of the largest dimension of the thumbnail
     * @return a new compatible <code>BufferedImage</code> containing a
     *   thumbnail of <code>image</code>
     * @throws IllegalArgumentException if <code>newSize</code> is larger than
     *   the largest dimension of <code>image</code> or &lt;= 0
     */
    public static BufferedImage createThumbnailFast(BufferedImage image,
                                                    int newSize) {
        float ratio;
        int width = image.getWidth();
        int height = image.getHeight();

        if (width > height) {
            if (newSize >= width) {
                throw new IllegalArgumentException("newSize must be lower than" +
                                                   " the image width");
            } else if (newSize <= 0) {
                 throw new IllegalArgumentException("newSize must" +
                                                    " be greater than 0");
            }

            ratio = (float) width / (float) height;
            width = newSize;
            height = (int) (newSize / ratio);
        } else {
            if (newSize >= height) {
                throw new IllegalArgumentException("newSize must be lower than" +
                                                   " the image height");
            } else if (newSize <= 0) {
                 throw new IllegalArgumentException("newSize must" +
                                                    " be greater than 0");
            }

            ratio = (float) height / (float) width;
            height = newSize;
            width = (int) (newSize / ratio);
        }

        BufferedImage temp = createCompatibleImage(image, width, height);
        Graphics2D g2 = temp.createGraphics();
        g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                            RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        g2.drawImage(image, 0, 0, temp.getWidth(), temp.getHeight(), null);
        g2.dispose();

        return temp;
    }

    /**
     * <p>Returns a thumbnail of a source image.</p>
     * <p>This method favors speed over quality. When the new size is less than
     * half the longest dimension of the source image,
     * {@link #createThumbnail(BufferedImage, int)} or
     * {@link #createThumbnail(BufferedImage, int, int)} should be used instead
     * to ensure the quality of the result without sacrificing too much
     * performance.</p>
     *
     * @see #createThumbnailFast(java.awt.image.BufferedImage, int)
     * @see #createThumbnail(java.awt.image.BufferedImage, int)
     * @see #createThumbnail(java.awt.image.BufferedImage, int, int)
     * @param image the source image
     * @param newWidth the width of the thumbnail
     * @param newHeight the height of the thumbnail
     * @return a new compatible <code>BufferedImage</code> containing a
     *   thumbnail of <code>image</code>
     * @throws IllegalArgumentException if <code>newWidth</code> is larger than
     *   the width of <code>image</code> or if code>newHeight</code> is larger
     *   than the height of <code>image</code> or if one of the dimensions
     *   is &lt;= 0
     */
    public static BufferedImage createThumbnailFast(BufferedImage image,
                                                    int newWidth, int newHeight) {
        if (newWidth >= image.getWidth() ||
            newHeight >= image.getHeight()) {
            throw new IllegalArgumentException("newWidth and newHeight cannot" +
                                               " be greater than the image" +
                                               " dimensions");
        } else if (newWidth <= 0 || newHeight <= 0) {
            throw new IllegalArgumentException("newWidth and newHeight must" +
                                               " be greater than 0");
        }

        BufferedImage temp = createCompatibleImage(image, newWidth, newHeight);
        Graphics2D g2 = temp.createGraphics();
        g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                            RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        g2.drawImage(image, 0, 0, temp.getWidth(), temp.getHeight(), null);
        g2.dispose();

        return temp;
    }

    /**
     * <p>Returns a thumbnail of a source image. <code>newSize</code> defines
     * the length of the longest dimension of the thumbnail. The other
     * dimension is then computed according to the dimensions ratio of the
     * original picture.</p>
     * <p>This method offers a good trade-off between speed and quality.
     * The result looks better than
     * {@link #createThumbnailFast(java.awt.image.BufferedImage, int)} when
     * the new size is less than half the longest dimension of the source
     * image, yet the rendering speed is almost similar.</p>
     *
     * @see #createThumbnailFast(java.awt.image.BufferedImage, int, int)
     * @see #createThumbnailFast(java.awt.image.BufferedImage, int)
     * @see #createThumbnail(java.awt.image.BufferedImage, int, int)
     * @param image the source image
     * @param newSize the length of the largest dimension of the thumbnail
     * @return a new compatible <code>BufferedImage</code> containing a
     *   thumbnail of <code>image</code>
     * @throws IllegalArgumentException if <code>newSize</code> is larger than
     *   the largest dimension of <code>image</code> or &lt;= 0
     */
    public static BufferedImage createThumbnail(BufferedImage image,
                                                int newSize) {
        int width = image.getWidth();
        int height = image.getHeight();

        boolean isWidthGreater = width > height;

        if (isWidthGreater) {
            if (newSize >= width) {
                throw new IllegalArgumentException("newSize must be lower than" +
                                                   " the image width");
            }
        } else if (newSize >= height) {
            throw new IllegalArgumentException("newSize must be lower than" +
                                               " the image height");
        }

        if (newSize <= 0) {
            throw new IllegalArgumentException("newSize must" +
                                               " be greater than 0");
        }

        float ratioWH = (float) width / (float) height;
        float ratioHW = (float) height / (float) width;

        BufferedImage thumb = image;

        do {
            if (isWidthGreater) {
                width /= 2;
                if (width < newSize) {
                    width = newSize;
                }
                height = (int) (width / ratioWH);
            } else {
                height /= 2;
                if (height < newSize) {
                    height = newSize;
                }
                width = (int) (height / ratioHW);
            }


            BufferedImage temp = createCompatibleImage(image, width, height);
            Graphics2D g2 = temp.createGraphics();
            g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                                RenderingHints.VALUE_INTERPOLATION_BILINEAR);
            g2.drawImage(thumb, 0, 0, temp.getWidth(), temp.getHeight(), null);
            g2.dispose();

            thumb = temp;
        } while (newSize != (isWidthGreater ? width : height));

        return thumb;
    }

    /**
     * <p>Returns a thumbnail of a source image.</p>
     * <p>This method offers a good trade-off between speed and quality.
     * The result looks better than
     * {@link #createThumbnailFast(java.awt.image.BufferedImage, int)} when
     * the new size is less than half the longest dimension of the source
     * image, yet the rendering speed is almost similar.</p>
     *
     * @see #createThumbnailFast(java.awt.image.BufferedImage, int)
     * @see #createThumbnailFast(java.awt.image.BufferedImage, int, int)
     * @see #createThumbnail(java.awt.image.BufferedImage, int)
     * @param image the source image
     * @param newWidth the width of the thumbnail
     * @param newHeight the height of the thumbnail
     * @return a new compatible <code>BufferedImage</code> containing a
     *   thumbnail of <code>image</code>
     * @throws IllegalArgumentException if <code>newWidth</code> is larger than
     *   the width of <code>image</code> or if code>newHeight</code> is larger
     *   than the height of <code>image or if one the dimensions is not &gt; 0</code>
     */
    public static BufferedImage createThumbnail(BufferedImage image,
                                                int newWidth, int newHeight) {
        int width = image.getWidth();
        int height = image.getHeight();

        if (newWidth >= width || newHeight >= height) {
            throw new IllegalArgumentException("newWidth and newHeight cannot" +
                                               " be greater than the image" +
                                               " dimensions");
        } else if (newWidth <= 0 || newHeight <= 0) {
            throw new IllegalArgumentException("newWidth and newHeight must" +
                                               " be greater than 0");
        }

        BufferedImage thumb = image;

        do {
            if (width > newWidth) {
                width /= 2;
                if (width < newWidth) {
                    width = newWidth;
                }
            }

            if (height > newHeight) {
                height /= 2;
                if (height < newHeight) {
                    height = newHeight;
                }
            }

            BufferedImage temp = createCompatibleImage(image, width, height);
            Graphics2D g2 = temp.createGraphics();
            g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                                RenderingHints.VALUE_INTERPOLATION_BILINEAR);
            g2.drawImage(thumb, 0, 0, temp.getWidth(), temp.getHeight(), null);
            g2.dispose();

            thumb = temp;
        } while (width != newWidth || height != newHeight);

        return thumb;
    }

    /**
     * <p>Returns an array of pixels, stored as integers, from a
     * <code>BufferedImage</code>. The pixels are grabbed from a rectangular
     * area defined by a location and two dimensions. Calling this method on
     * an image of type different from <code>BufferedImage.TYPE_INT_ARGB</code>
     * and <code>BufferedImage.TYPE_INT_RGB</code> will unmanage the image.</p>
     *
     * @param img the source image
     * @param x the x location at which to start grabbing pixels
     * @param y the y location at which to start grabbing pixels
     * @param w the width of the rectangle of pixels to grab
     * @param h the height of the rectangle of pixels to grab
     * @param pixels a pre-allocated array of pixels of size w*h; can be null
     * @return <code>pixels</code> if non-null, a new array of integers
     *   otherwise
     * @throws IllegalArgumentException is <code>pixels</code> is non-null and
     *   of length &lt; w*h
     */
    public static int[] getPixels(BufferedImage img,
                                  int x, int y, int w, int h, int[] pixels) {
        if (w == 0 || h == 0) {
            return new int[0];
        }

        if (pixels == null) {
            pixels = new int[w * h];
        } else if (pixels.length < w * h) {
            throw new IllegalArgumentException("pixels array must have a length" +
                                               " >= w*h");
        }

        int imageType = img.getType();
        if (imageType == BufferedImage.TYPE_INT_ARGB ||
            imageType == BufferedImage.TYPE_INT_RGB) {
            Raster raster = img.getRaster();
            return (int[]) raster.getDataElements(x, y, w, h, pixels);
        }

        // Unmanages the image
        return img.getRGB(x, y, w, h, pixels, 0, w);
    }

    /**
     * <p>Writes a rectangular area of pixels in the destination
     * <code>BufferedImage</code>. Calling this method on
     * an image of type different from <code>BufferedImage.TYPE_INT_ARGB</code>
     * and <code>BufferedImage.TYPE_INT_RGB</code> will unmanage the image.</p>
     *
     * @param img the destination image
     * @param x the x location at which to start storing pixels
     * @param y the y location at which to start storing pixels
     * @param w the width of the rectangle of pixels to store
     * @param h the height of the rectangle of pixels to store
     * @param pixels an array of pixels, stored as integers
     * @throws IllegalArgumentException is <code>pixels</code> is non-null and
     *   of length &lt; w*h
     */
    public static void setPixels(BufferedImage img,
                                 int x, int y, int w, int h, int[] pixels) {
        if (pixels == null || w == 0 || h == 0) {
            return;
        } else if (pixels.length < w * h) {
            throw new IllegalArgumentException("pixels array must have a length" +
                                               " >= w*h");
        }

        int imageType = img.getType();
        if (imageType == BufferedImage.TYPE_INT_ARGB ||
            imageType == BufferedImage.TYPE_INT_RGB) {
            WritableRaster raster = img.getRaster();
            raster.setDataElements(x, y, w, h, pixels);
        } else {
            // Unmanages the image
            img.setRGB(x, y, w, h, pixels, 0, w);
        }
    }
}
 /*
  * $Id: ColorUtilities.java,v 1.1 2006/12/15 13:53:13 gfx Exp $
  *
  * Dual-licensed under LGPL (Sun and Romain Guy) and BSD (Romain Guy).
  *
  * Copyright 2006 Sun Microsystems, Inc., 4150 Network Circle,
  * Santa Clara, California 95054, U.S.A. All rights reserved.
  *
  * Copyright (c) 2006 Romain Guy <romain.guy@mac.com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. The name of the author may not be used to endorse or promote products
  *    derived from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */



 /**
  * <p><code>ColorUtilities</code> contains a set of tools to perform
  * common color operations easily.</p>
  *
  * @author Romain Guy <romain.guy@mac.com>
  */
  class ColorUtilities {
     private ColorUtilities() {
     }

     /**
      * <p>Returns the HSL (Hue/Saturation/Luminance) equivalent of a given
      * RGB color. All three HSL components are between 0.0 and 1.0.</p>
      *
      * @param color the RGB color to convert
      * @return a new array of 3 floats corresponding to the HSL components
      */
     public static float[] RGBtoHSL(Color color) {
         return RGBtoHSL(color.getRed(), color.getGreen(), color.getBlue(), null);
     }

     /**
      * <p>Returns the HSL (Hue/Saturation/Luminance) equivalent of a given
      * RGB color. All three HSL components are between 0.0 and 1.0.</p>
      *
      * @param color the RGB color to convert
      * @param hsl a pre-allocated array of floats; can be null
      * @return <code>hsl</code> if non-null, a new array of 3 floats otherwise
      * @throws IllegalArgumentException if <code>hsl</code> has a length lower
      *   than 3
      */
     public static float[] RGBtoHSL(Color color, float[] hsl) {
         return RGBtoHSL(color.getRed(), color.getGreen(), color.getBlue(), hsl);
     }

     /**
      * <p>Returns the HSL (Hue/Saturation/Luminance) equivalent of a given
      * RGB color. All three HSL components are between 0.0 and 1.0.</p>
      *
      * @param r the red component, between 0 and 255
      * @param g the green component, between 0 and 255
      * @param b the blue component, between 0 and 255
      * @return a new array of 3 floats corresponding to the HSL components
      */
     public static float[] RGBtoHSL(int r, int g, int b) {
         return RGBtoHSL(r, g, b, null);
     }

     /**
      * <p>Returns the HSL (Hue/Saturation/Luminance) equivalent of a given
      * RGB color. All three HSL components are floats between 0.0 and 1.0.</p>
      *
      * @param r the red component, between 0 and 255
      * @param g the green component, between 0 and 255
      * @param b the blue component, between 0 and 255
      * @param hsl a pre-allocated array of floats; can be null
      * @return <code>hsl</code> if non-null, a new array of 3 floats otherwise
      * @throws IllegalArgumentException if <code>hsl</code> has a length lower
      *   than 3
      */
     public static float[] RGBtoHSL(int r, int g, int b, float[] hsl) {
         if (hsl == null) {
             hsl = new float[3];
         } else if (hsl.length < 3) {
             throw new IllegalArgumentException("hsl array must have a length of" +
                                                " at least 3");
         }

         if (r < 0) r = 0;
         else if (r > 255) r = 255;
         if (g < 0) g = 0;
         else if (g > 255) g = 255;
         if (b < 0) b = 0;
         else if (b > 255) b = 255;

         float var_R = (r / 255f);
         float var_G = (g / 255f);
         float var_B = (b / 255f);

         float var_Min;
         float var_Max;
         float del_Max;

         if (var_R > var_G) {
             var_Min = var_G;
             var_Max = var_R;
         } else {
             var_Min = var_R;
             var_Max = var_G;
         }
         if (var_B > var_Max) {
             var_Max = var_B;
         }
         if (var_B < var_Min) {
             var_Min = var_B;
         }

         del_Max = var_Max - var_Min;

         float H, S, L;
         L = (var_Max + var_Min) / 2f;

         if (del_Max - 0.01f <= 0.0f) {
             H = 0;
             S = 0;
         } else {
             if (L < 0.5f) {
                 S = del_Max / (var_Max + var_Min);
             } else {
                 S = del_Max / (2 - var_Max - var_Min);
             }

             float del_R = (((var_Max - var_R) / 6f) + (del_Max / 2f)) / del_Max;
             float del_G = (((var_Max - var_G) / 6f) + (del_Max / 2f)) / del_Max;
             float del_B = (((var_Max - var_B) / 6f) + (del_Max / 2f)) / del_Max;

             if (var_R == var_Max) {
                 H = del_B - del_G;
             } else if (var_G == var_Max) {
                 H = (1 / 3f) + del_R - del_B;
             } else {
                 H = (2 / 3f) + del_G - del_R;
             }
             if (H < 0) {
                 H += 1;
             }
             if (H > 1) {
                 H -= 1;
             }
         }

         hsl[0] = H;
         hsl[1] = S;
         hsl[2] = L;

         return hsl;
     }

     /**
      * <p>Returns the RGB equivalent of a given HSL (Hue/Saturation/Luminance)
      * color.</p>
      *
      * @param h the hue component, between 0.0 and 1.0
      * @param s the saturation component, between 0.0 and 1.0
      * @param l the luminance component, between 0.0 and 1.0
      * @return a new <code>Color</code> object equivalent to the HSL components
      */
     public static Color HSLtoRGB(float h, float s, float l) {
         int[] rgb = HSLtoRGB(h, s, l, null);
         return new Color(rgb[0], rgb[1], rgb[2]);
     }

     /**
      * <p>Returns the RGB equivalent of a given HSL (Hue/Saturation/Luminance)
      * color. All three RGB components are integers between 0 and 255.</p>
      *
      * @param h the hue component, between 0.0 and 1.0
      * @param s the saturation component, between 0.0 and 1.0
      * @param l the luminance component, between 0.0 and 1.0
      * @param rgb a pre-allocated array of ints; can be null
      * @return <code>rgb</code> if non-null, a new array of 3 ints otherwise
      * @throws IllegalArgumentException if <code>rgb</code> has a length lower
      *   than 3
      */
     public static int[] HSLtoRGB(float h, float s, float l, int[] rgb) {
         if (rgb == null) {
             rgb = new int[3];
         } else if (rgb.length < 3) {
             throw new IllegalArgumentException("rgb array must have a length of" +
                                                " at least 3");
         }

         if (h < 0) h = 0.0f;
         else if (h > 1.0f) h = 1.0f;
         if (s < 0) s = 0.0f;
         else if (s > 1.0f) s = 1.0f;
         if (l < 0) l = 0.0f;
         else if (l > 1.0f) l = 1.0f;

         int R, G, B;

         if (s - 0.01f <= 0.0f) {
             R = (int) (l * 255.0f);
             G = (int) (l * 255.0f);
             B = (int) (l * 255.0f);
         } else {
             float var_1, var_2;
             if (l < 0.5f) {
                 var_2 = l * (1 + s);
             } else {
                 var_2 = (l + s) - (s * l);
             }
             var_1 = 2 * l - var_2;

             R = (int) (255.0f * hue2RGB(var_1, var_2, h + (1.0f / 3.0f)));
             G = (int) (255.0f * hue2RGB(var_1, var_2, h));
             B = (int) (255.0f * hue2RGB(var_1, var_2, h - (1.0f / 3.0f)));
         }

         rgb[0] = R;
         rgb[1] = G;
         rgb[2] = B;

         return rgb;
     }

     private static float hue2RGB(float v1, float v2, float vH) {
         if (vH < 0.0f) {
             vH += 1.0f;
         }
         if (vH > 1.0f) {
             vH -= 1.0f;
         }
         if ((6.0f * vH) < 1.0f) {
             return (v1 + (v2 - v1) * 6.0f * vH);
         }
         if ((2.0f * vH) < 1.0f) {
             return (v2);
         }
         if ((3.0f * vH) < 2.0f) {
             return (v1 + (v2 - v1) * ((2.0f / 3.0f) - vH) * 6.0f);
         }
         return (v1);
     }
 }
 

   
    
  










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