ImageUtil.java

/*
   JMeld is a visual diff and merge tool.
   Copyright (C) 2007  Kees Kuip
   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 2.1 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; without 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., 51 Franklin Street, Fifth Floor,
   Boston, MA  02110-1301  USA
 */
package org.jmeld.ui.util;

import org.jmeld.util.ResourceLoader;

import javax.swing.*;
import java.awt.*;
import java.awt.image.FilteredImageSource;
import java.awt.image.ImageFilter;
import java.awt.image.ImageProducer;
import java.net.URL;

public class ImageUtil
{
  public static synchronized ImageIcon getSmallImageIcon(String iconName)
  {
    return getImageIcon("16x16/" + iconName + "-16");
  }

  public static synchronized ImageIcon getLargeImageIcon(String iconName)
  {
    return getImageIcon("32x32/" + iconName);
  }

  public static synchronized ImageIcon getImageIcon(String iconName)
  {
    ImageIcon icon;
    URL url;

    iconName = "images/" + iconName + ".png";

    url = ResourceLoader.getResource(iconName);
    if (url == null)
    {
      return null;
    }

    return new ImageIcon(url);
  }

  public static ImageIcon createDarkerIcon(ImageIcon icon)
  {
    return createDarkerIcon(icon, -0.10f);
  }

  /** Create a x% Transparent icon */
  public static ImageIcon createDarkerIcon(ImageIcon icon, float percentage)
  {
    return createIcon(icon, new BrightnessFilter(percentage));
  }

  /** Create a 20% Transparent icon */
  public static ImageIcon createTransparentIcon(ImageIcon icon)
  {
    return createTransparentIcon(icon, 20);
  }

  /** Create a x% Transparent icon */
  public static ImageIcon createTransparentIcon(ImageIcon icon, int percentage)
  {
    return createIcon(icon, new TransparentFilter(percentage));
  }

  /** Create a new icon which is filtered by some ImageFilter */
  private static synchronized ImageIcon createIcon(ImageIcon icon,
      ImageFilter filter)
  {
    ImageProducer ip;
    Image image;
    MediaTracker tracker;

    if (icon == null)
    {
      return null;
    }

    ip = new FilteredImageSource(icon.getImage().getSource(), filter);
    image = Toolkit.getDefaultToolkit().createImage(ip);

    tracker = new MediaTracker(new JPanel());
    tracker.addImage(image, 1);
    try
    {
      tracker.waitForID(1);
    }
    catch (InterruptedException e)
    {
      e.printStackTrace();
      return null;
    }

    return new ImageIcon(image);
  }
}