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.Dimension; 28 import java.awt.Image; 29 import java.awt.Graphics; 30 import java.awt.geom.Dimension2D; 31 import java.awt.image.BufferedImage; 32 import java.awt.image.ImageObserver; 33 import java.util.Arrays; 34 import java.util.List; 35 import java.util.function.Function; 36 import java.util.function.BiFunction; 37 import java.util.stream.Collectors; 38 39 public class MultiResolutionBufferedImage extends BufferedImage 40 implements MultiResolutionImage { 41 42 private final BiFunction<Integer, Integer, Image> mapper; 43 private final Dimension2D[] sizes; 44 private int availableInfo; 45 46 public MultiResolutionBufferedImage(Image baseImage, 47 BiFunction<Integer, Integer, Image> mapper) { 48 this(baseImage, new Dimension[]{new Dimension( 49 baseImage.getWidth(null), baseImage.getHeight(null)) 50 }, mapper); 51 } 52 53 public MultiResolutionBufferedImage(Image baseImage, 54 Dimension2D[] sizes, BiFunction<Integer, Integer, Image> mapper) { 55 super(baseImage.getWidth(null), baseImage.getHeight(null), 56 BufferedImage.TYPE_INT_ARGB_PRE); 57 this.sizes = sizes; 58 this.mapper = mapper; 59 this.availableInfo = getInfo(baseImage); 60 Graphics g = getGraphics(); 61 g.drawImage(baseImage, 0, 0, null); 62 g.dispose(); 63 } 64 65 @Override 66 public Image getResolutionVariant(int width, int height) { 67 int baseWidth = getWidth(); 68 int baseHeight = getHeight(); 69 70 if (baseWidth == width && baseHeight == height) { 71 return this; 72 } 73 74 ImageCache cache = ImageCache.getInstance(); 75 ImageCacheKey key = new ImageCacheKey(this, width, height); 76 Image resolutionVariant = cache.getImage(key); 77 if (resolutionVariant == null) { 78 resolutionVariant = mapper.apply(width, height); 79 cache.setImage(key, resolutionVariant); 80 preload(resolutionVariant, availableInfo); 81 } 82 83 return resolutionVariant; 84 } 85 86 @Override 87 public List<Image> getResolutionVariants() { 88 return Arrays.stream(sizes).map((Function<Dimension2D, Image>) size 89 -> getResolutionVariant((int) size.getWidth(), 90 (int) size.getHeight())).collect(Collectors.toList()); 91 } 92 93 public MultiResolutionBufferedImage map(Function<Image, Image> mapper) { 94 return new MultiResolutionBufferedImage(mapper.apply(this), sizes, 95 (width, height) -> 96 mapper.apply(getResolutionVariant(width, height))); 97 } 98 99 @Override 100 public int getWidth(ImageObserver observer) { 101 availableInfo |= ImageObserver.WIDTH; 102 return super.getWidth(observer); 103 } 104 105 @Override 106 public int getHeight(ImageObserver observer) { 107 availableInfo |= ImageObserver.HEIGHT; 108 return super.getHeight(observer); 109 } 110 111 @Override 112 public Object getProperty(String name, ImageObserver observer) { 113 availableInfo |= ImageObserver.PROPERTIES; 114 return super.getProperty(name, observer); 115 } 116 117 private static int getInfo(Image image) { 118 if (image instanceof ToolkitImage) { 119 return ((ToolkitImage) image).getImageRep().check( 120 (img, infoflags, x, y, w, h) -> false); 121 } 122 return 0; 123 } 124 125 private static void preload(Image image, int availableInfo) { 126 if (availableInfo != 0 && image instanceof ToolkitImage) { 127 ((ToolkitImage) image).preload(new ImageObserver() { 128 int flags = availableInfo; 129 130 @Override 131 public boolean imageUpdate(Image img, int infoflags, 132 int x, int y, int width, int height) { 133 flags &= ~infoflags; 134 return (flags != 0) && ((infoflags 135 & (ImageObserver.ERROR | ImageObserver.ABORT)) == 0); 136 } 137 }); 138 } 139 } 140 141 private static class ImageCacheKey implements ImageCache.PixelsKey { 142 143 private final int pixelCount; 144 private final int hash; 145 146 private final int w; 147 private final int h; 148 private final Image baseImage; 149 150 ImageCacheKey(final Image baseImage, 151 final int w, final int h) { 152 this.baseImage = baseImage; 153 this.w = w; 154 this.h = h; 155 this.pixelCount = w * h; 156 hash = hash(); 157 } 158 159 @Override 160 public int getPixelCount() { 161 return pixelCount; 162 } 163 164 private int hash() { 165 int hash = baseImage.hashCode(); 166 hash = 31 * hash + w; 167 hash = 31 * hash + h; 168 return hash; 169 } 170 171 @Override 172 public int hashCode() { 173 return hash; 174 } 175 176 @Override 177 public boolean equals(Object obj) { 178 if (obj instanceof ImageCacheKey) { 179 ImageCacheKey key = (ImageCacheKey) obj; 180 return baseImage == key.baseImage && w == key.w && h == key.h; 181 } 182 return false; 183 } 184 } 185 }