1 /*
   2  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package sun.awt.image;
  26 
  27 import java.awt.Image;
  28 import java.awt.Graphics;
  29 import java.awt.image.BufferedImage;
  30 import java.util.Arrays;
  31 import java.util.List;
  32 import java.util.function.Function;
  33 
  34 public class MultiResolutionBufferedImage extends BufferedImage
  35         implements MultiResolutionImage {
  36 
  37     Image[] resolutionVariants;
  38     int baseIndex;
  39 
  40     public MultiResolutionBufferedImage(int imageType, int baseIndex, Image... images) {
  41         super(images[baseIndex].getWidth(null), images[baseIndex].getHeight(null),
  42                 imageType);
  43         this.baseIndex = baseIndex;
  44         this.resolutionVariants = images;
  45         Graphics g = getGraphics();
  46         g.drawImage(images[baseIndex], 0, 0, null);
  47         g.dispose();
  48         images[baseIndex] = this;
  49     }
  50 
  51     @Override
  52     public Image getResolutionVariant(int width, int height) {
  53         for (Image image : resolutionVariants) {
  54             if (width <= image.getWidth(null) && height <= image.getHeight(null)) {
  55                 return image;
  56             }
  57         }
  58         return this;
  59     }
  60 
  61     @Override
  62     public List<Image> getResolutionVariants() {
  63         return Arrays.asList(resolutionVariants);
  64     }
  65 
  66     public MultiResolutionBufferedImage map(Function<Image, Image> mapper) {
  67         return new MultiResolutionBufferedImage(getType(), baseIndex,
  68                 Arrays.stream(resolutionVariants).map(mapper)
  69                         .toArray(length -> new Image[length]));
  70     }
  71 }