/*

     dsh-iconbundle  Bundles of variants for icon images.

     Copyright (c) 2003-2013 held jointly by the individual authors.

     This library is free software; you can redistribute it and/or modify it

     under the terms of the GNU Lesser General Public License as published

     by the Free Software Foundation; either version 3 of the License, or (at

     your option) any later version.

     This library is distributed in the hope that it will be useful, but WITHOUT

     ANY WARRANTY; with out even the implied warranty of MERCHANTABILITY or

     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public

     License for more details.

     You should have received a copy of the GNU Lesser General Public License

     along with this library;  if not, write to the Free Software Foundation,

     Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA.

     > http://www.fsf.org/licensing/licenses/lgpl.html

     > http://www.opensource.org/licenses/lgpl-license.php

 */

 package org.dishevelled.iconbundle.impl;

 import java.awt.Color;

 import java.awt.Image;

 import java.awt.image.Raster;

 import java.awt.image.RasterOp;

 import java.awt.image.RescaleOp;

 import java.awt.image.BufferedImage;

 import java.awt.image.WritableRaster;

 /**

  * IconBundle static utility class.

  *

  * @author  Michael Heuer

  */

 public final class IconBundleUtils

 {

     /** Intensity factor for red. */

     private static final float RED_FACTOR = 0.30f;

     /** Intensity factor for green. */

     private static final float GREEN_FACTOR = 0.59f;

     /** Intensity factor for blue. */

     private static final float BLUE_FACTOR = 0.11f;

     /** Pixel array size. */

     private static final int PIXEL_ARRAY_SIZE = 4;

     /** Medium grey color component. */

     private static final int MEDIUM_GREY = 127;

     /** Disabled pattern factor. */

     private static final float DISABLED_PATTERN_FACTOR = 0.7f;

     /**

      * RescaleOp for saturating active images.

      */

     private static final RescaleOp ACTIVE_OP = new RescaleOp(new float[] { 0.8f, 0.8f, 0.8f, 1.0f },

                                                              new float[] { 0.0f, 0.0f, 0.0f, 0.0f },

                                                              null);

     //private static final RescaleOp ACTIVE_OP = new RescaleOp(0.8f, 0.0f, null);

     /**

      * RescaleOp for saturating mouseover images.

      */

     private static final RescaleOp MOUSEOVER_OP = new RescaleOp(new float[] { 1.2f, 1.2f, 1.2f, 1.0f },

                                                                 new float[] { 0.0f, 0.0f, 0.0f, 0.0f },

                                                                 null);

     //private static final RescaleOp MOUSEOVER_OP = new RescaleOp(1.2f, 0.0f, null);

     /**

      * RescaleOp for creating translucent dragging images.

      */

     private static final RescaleOp DRAGGING_OP = new RescaleOp(new float[] { 1.0f, 1.0f, 1.0f, 0.2f },

                                                                new float[] { 0.0f, 0.0f, 0.0f, 0.0f },

                                                                null);

     /**

      * RescaleOp for desaturating disabled images.

      */

     private static final RescaleOp DISABLED_SATURATION_OP = new RescaleOp(new float[] { 0.8f, 0.8f, 0.8f, 1.0f },

                                                                           new float[] { 0.0f, 0.0f, 0.0f, 0.0f },

                                                                          null);

     //private static final RescaleOp DISABLED_SATURATION_OP = new RescaleOp(0.8f, 0.0f, null);

     /**

      * RasterOp for creating the pattern overlay for disabled images.

      */

     private static final RasterOp DISABLED_PATTERN_OP = new AbstractRasterOp()

         {

             /** {@inheritDoc} */

             public WritableRaster filter(final Raster src, final WritableRaster dest)

             {

                 float intensity;

                 float[] pixel = new float[PIXEL_ARRAY_SIZE];

                 for (int x = 0, w = src.getWidth(); x < w; x++)

                 {

                     for (int y = 0, h = src.getHeight(); y < h; y++)

                     {

                         pixel = src.getPixel(x, y, pixel);

                         intensity = calculateIntensity(pixel[0], pixel[1], pixel[2]);

                         if (((x + y) % 2) == 0)

                         {

                             pixel[0] = (intensity / 2) + MEDIUM_GREY;

                             pixel[1] = (intensity / 2) + MEDIUM_GREY;

                             pixel[2] = (intensity / 2) + MEDIUM_GREY;

                         }

                         else

                         {

                             pixel[0] *= DISABLED_PATTERN_FACTOR;

                             pixel[1] *= DISABLED_PATTERN_FACTOR;

                             pixel[2] *= DISABLED_PATTERN_FACTOR;

                         }

                         dest.setPixel(x, y, pixel);

                     }

                 }

                 return dest;

             }

         };

     /**

      * Private constructor.

      */

     private IconBundleUtils()

     {

         // empty

     }

     /**

      * Calculate a measure of intensity for the specified RGB values.

      *

      * @param r red value

      * @param g green value

      * @param b blue value

      * @return a measure of intensity for the specified RGB values

      */

     private static float calculateIntensity(final float r, final float g, final float b)

     {

         return (float) (r * RED_FACTOR + g * GREEN_FACTOR + b * BLUE_FACTOR);

     }

     /**

      * Make the specified source image active.

      *

      * @param src source image

      * @return filtered source image

      */

     public static Image makeActive(final BufferedImage src)

     {

         /*

         BufferedImage dest;

         try

         {

             dest = new BufferedImage(src.getColorModel(),

                                                src.copyData(null),

                                                src.isAlphaPremultiplied(),

                                                null);

         }

         catch (IllegalArgumentException e)

         {

             dest = new BufferedImage(src.getWidth(), src.getHeight(), BufferedImage.TYPE_INT_ARGB);

             Graphics2D graphics = dest.createGraphics();

             graphics.drawImage(src, 0, 0, null);

             graphics.dispose();

         }

         */

         BufferedImage dest = new BufferedImage(src.getColorModel(),

                                                src.copyData(null),

                                                src.isAlphaPremultiplied(),

                                                null);

         ACTIVE_OP.filter(src, dest);

         return dest;

     }

     /**

      * Make the specified source image disabled.

      *

      * @param src source image

      * @return filtered source image

      */

     public static Image makeDisabled(final BufferedImage src)

     {

         BufferedImage dest = new BufferedImage(src.getColorModel(),

                                                src.copyData(null),

                                                src.isAlphaPremultiplied(),

                                                null);

         DISABLED_SATURATION_OP.filter(src, dest);

         DISABLED_PATTERN_OP.filter(src.getRaster(), dest.getRaster());

         return dest;

     }

     /**

      * Make the specified source image dragging.

      *

      * @param src source image

      * @return filtered source image

      */

     public static Image makeDragging(final BufferedImage src)

     {

         BufferedImage dest = new BufferedImage(src.getColorModel(),

                                                src.copyData(null),

                                                src.isAlphaPremultiplied(),

                                                null);

         DRAGGING_OP.filter(src, dest);

         return dest;

     }

     /**

      * Make the specified source image mouseover.

      *

      * @param src source image

      * @return filtered source image

      */

     public static Image makeMouseover(final BufferedImage src)

     {

         BufferedImage dest = new BufferedImage(src.getColorModel(),

                                                src.copyData(null),

                                                src.isAlphaPremultiplied(),

                                                null);

         MOUSEOVER_OP.filter(src, dest);

         return dest;

     }

     /**

      * Make the specified source image selected.

      *

      * @param src source image

      * @param selectionColor selection color

      * @return filtered source image

      */

     public static Image makeSelected(final BufferedImage src, final Color selectionColor)

     {

         BufferedImage dest = new BufferedImage(src.getColorModel(),

                                                src.copyData(null),

                                                src.isAlphaPremultiplied(),

                                                null);

         RasterOp selectionOp = new SelectionRasterOp(selectionColor);

         selectionOp.filter(src.getRaster(), dest.getRaster());

         selectionOp = null;

         return dest;

     }

     /**

      * Make the specified source image selected mouseover.

      *

      * @param src source image

      * @param selectionColor selection color

      * @return filtered source image

      */

     public static Image makeSelectedMouseover(final BufferedImage src, final Color selectionColor)

     {

         return makeMouseover((BufferedImage) makeSelected(src, selectionColor));

     }

 }