text: /*
   * Copyright (c) 2005-2020 Radiance Kirill Grouchnikov. All Rights Reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   *  o Redistributions of source code must retain the above copyright notice,
   *    this list of conditions and the following disclaimer.
   *
   *  o 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.
   *
   *  o Neither the name of the copyright holder nor the names of
   *    its contributors may be used to endorse or promote products derived
   *    from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR
   * CONTRIBUTORS 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.
   */
  package org.pushingpixels.flamingo.api.common.icon;
  
  import org.pushingpixels.neon.api.AsynchronousLoading;
  import org.pushingpixels.neon.api.NeonCortex;
  import org.pushingpixels.neon.api.icon.ResizableIcon;
  import org.pushingpixels.neon.internal.contrib.intellij.UIUtil;
  
  import java.awt.*;
  import java.awt.image.BufferedImage;
  import java.awt.image.BufferedImageOp;
  import java.util.LinkedHashMap;
  import java.util.Map;
  
  /**
   * Implementation of {@link ResizableIcon} that allows applying a
   * {@link BufferedImageOp} on another icon.
   *
   * @author Kirill Grouchnikov
   */
  public class FilteredResizableIcon implements ResizableIcon {
      /**
       * Image cache to speed up rendering.
       */
      private Map<String, BufferedImage> cachedImages;
  
      /**
       * The main (pre-filtered) icon.
       */
      private ResizableIcon delegate;
  
      /**
       * Filter operation.
       */
      private BufferedImageOp operation;
  
      /**
       * Creates a new filtered icon.
       *
       * @param delegate  The main (pre-filtered) icon.
       * @param operation Filter operation.
       */
      private FilteredResizableIcon(ResizableIcon delegate, BufferedImageOp operation) {
          super();
          this.delegate = delegate;
          this.operation = operation;
          this.cachedImages = new LinkedHashMap<String, BufferedImage>() {
              @Override
              protected boolean removeEldestEntry(
                      java.util.Map.Entry<String, BufferedImage> eldest) {
                  return size() > 5;
              }
          };
      }
  
      @Override
      public int getIconHeight() {
          return delegate.getIconHeight();
      }
  
      @Override
      public int getIconWidth() {
          return delegate.getIconWidth();
      }
  
      @Override
      public void setDimension(Dimension newDimension) {
          delegate.setDimension(newDimension);
      }
  
      @Override
      public void paintIcon(Component c, Graphics g, int x, int y) {
          // check cache
          String key = this.getIconWidth() + ":" + this.getIconHeight();
          if (!this.cachedImages.containsKey(key)) {
              // check if loading
              if (this.delegate instanceof AsynchronousLoading) {
                  AsynchronousLoading asyncDelegate = (AsynchronousLoading) this.delegate;
                  // if the delegate is still loading - do nothing
                  if (asyncDelegate.isLoading()) {
                      return;
                  }
              }
              BufferedImage offscreen = NeonCortex.getBlankImage(this.getIconWidth(),
                      this.getIconHeight());
              Graphics2D g2d = offscreen.createGraphics();
              this.delegate.paintIcon(c, g2d, 0, 0);
              g2d.dispose();
              BufferedImage filtered = this.operation.filter(offscreen, null);
              this.cachedImages.put(key, filtered);
          }
          BufferedImage toDraw = this.cachedImages.get(key);
          Graphics2D g2d = (Graphics2D) g.create();
          g2d.translate(x, y);
          // Note that here we shouldn't use NeonCortex.drawImage as the result of applying
          // a generic (non-NeonAbstractFilter) filter is not going to be a high-DPI wrapper.
          double scaleFactor = UIUtil.getScaleFactor();
          g2d.drawImage(toDraw, 0, 0, (int) (toDraw.getWidth(null) / scaleFactor),
                  (int) (toDraw.getHeight(null) / scaleFactor), null);
          g2d.dispose();
      }
  
      public static Factory factory(Factory delegateFactory,
              BufferedImageOp operation) {
          return () -> new FilteredResizableIcon(delegateFactory.createNewIcon(), operation);
      }
  }
  