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