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.geom.Dimension2D; 30 import java.awt.image.BufferedImage; 31 import java.util.Arrays; 32 import java.util.List; 33 import java.util.function.Function; 34 import java.util.stream.Collectors; 35 36 public class MultiResolutionBufferedImage extends BufferedImage 37 implements MultiResolutionImage { 38 39 private final MultiResolutionImageMapper mapper; 40 private final Dimension2D[] sizes; 41 42 public MultiResolutionBufferedImage(Image baseImage, 43 Dimension2D[] sizes, MultiResolutionImageMapper mapper) { 44 super(baseImage.getWidth(null), baseImage.getHeight(null), 45 BufferedImage.TYPE_INT_ARGB_PRE); 46 this.sizes = sizes; 47 this.mapper = mapper; 48 Graphics g = getGraphics(); 49 g.drawImage(baseImage, 0, 0, null); 50 g.dispose(); 51 } 52 53 @Override 54 public Image getResolutionVariant(int width, int height) { 55 int baseWidth = getWidth(); 56 int baseHeight = getHeight(); 57 58 if (baseWidth == width && baseHeight == height) { 59 return this; 60 } 61 62 ImageCache cache = ImageCache.getInstance(); 63 ImageCacheKey key = new ImageCacheKey(this, width, height); 64 Image resolutionVariant = cache.getImage(key); 65 if (resolutionVariant == null) { 66 resolutionVariant = mapper.apply(width, height); 67 cache.setImage(key, resolutionVariant); 68 } 69 70 return resolutionVariant; 71 } 72 73 @Override 74 public List<Image> getResolutionVariants() { 75 return Arrays.stream(sizes).map((Function<Dimension2D, Image>) size 76 -> getResolutionVariant((int) size.getWidth(), 77 (int) size.getHeight())).collect(Collectors.toList()); 78 } 79 80 public MultiResolutionBufferedImage map(Function<Image, Image> mapper) { 81 return new MultiResolutionBufferedImage(mapper.apply(this), sizes, 82 (width, height) -> 83 mapper.apply(getResolutionVariant(width, height))); 84 } 85 86 public interface MultiResolutionImageMapper { 87 88 Image apply(int width, int height); 89 } 90 91 private static class ImageCacheKey implements ImageCache.PixelsKey { 92 93 private final int pixelCount; 94 private final int hash; 95 96 private final int w; 97 private final int h; 98 private final Image baseImage; 99 100 ImageCacheKey(final Image baseImage, 101 final int w, final int h) { 102 this.baseImage = baseImage; 103 this.w = w; 104 this.h = h; 105 this.pixelCount = w * h; 106 hash = hash(); 107 } 108 109 @Override 110 public int getPixelCount() { 111 return pixelCount; 112 } 113 114 private int hash() { 115 int hash = baseImage.hashCode(); 116 hash = 31 * hash + w; 117 hash = 31 * hash + h; 118 return hash; 119 } 120 121 @Override 122 public int hashCode() { 123 return hash; 124 } 125 126 @Override 127 public boolean equals(Object obj) { 128 if (obj instanceof ImageCacheKey) { 129 ImageCacheKey key = (ImageCacheKey) obj; 130 return baseImage == key.baseImage && w == key.w && h == key.h; 131 } 132 return false; 133 } 134 } 135 }