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.geom.Dimension2D; 30 import java.awt.image.ImageObserver; 31 import java.util.Arrays; 32 import java.util.List; 33 import java.util.function.Function; 34 import java.util.function.BiFunction; 35 import java.util.stream.Collectors; 36 import java.awt.image.MultiResolutionImage; 37 import java.awt.image.AbstractMultiResolutionImage; 38 39 public class MultiResolutionCachedImage extends AbstractMultiResolutionImage { 40 41 private final int baseImageWidth; 42 private final int baseImageHeight; 43 private final Dimension2D[] sizes; 44 private final BiFunction<Integer, Integer, Image> mapper; 45 private int availableInfo; 46 MultiResolutionCachedImage(int baseImageWidth, int baseImageHeight, BiFunction<Integer, Integer, Image> mapper)47 public MultiResolutionCachedImage(int baseImageWidth, int baseImageHeight, 48 BiFunction<Integer, Integer, Image> mapper) 49 { 50 this(baseImageWidth, baseImageHeight, 51 new Dimension[]{new Dimension( baseImageWidth, baseImageHeight) 52 }, mapper); 53 } 54 MultiResolutionCachedImage(int baseImageWidth, int baseImageHeight, Dimension2D[] sizes, BiFunction<Integer, Integer, Image> mapper)55 public MultiResolutionCachedImage(int baseImageWidth, int baseImageHeight, 56 Dimension2D[] sizes, 57 BiFunction<Integer, Integer, Image> mapper) 58 { 59 this(baseImageWidth, baseImageHeight, sizes, mapper, true); 60 } 61 MultiResolutionCachedImage(int baseImageWidth, int baseImageHeight, Dimension2D[] sizes, BiFunction<Integer, Integer, Image> mapper, boolean copySizes)62 private MultiResolutionCachedImage(int baseImageWidth, int baseImageHeight, 63 Dimension2D[] sizes, 64 BiFunction<Integer, Integer, Image> mapper, 65 boolean copySizes) 66 { 67 this.baseImageWidth = baseImageWidth; 68 this.baseImageHeight = baseImageHeight; 69 this.sizes = (copySizes && sizes != null) 70 ? Arrays.copyOf(sizes, sizes.length) 71 : sizes; 72 this.mapper = mapper; 73 } 74 75 @Override getResolutionVariant(double destWidth, double destHeight)76 public Image getResolutionVariant(double destWidth, double destHeight) { 77 checkSize(destWidth, destHeight); 78 int width = (int) Math.ceil(destWidth); 79 int height = (int) Math.ceil(destHeight); 80 ImageCache cache = ImageCache.getInstance(); 81 ImageCacheKey key = new ImageCacheKey(this, width, height); 82 Image resolutionVariant = cache.getImage(key); 83 if (resolutionVariant == null) { 84 resolutionVariant = mapper.apply(width, height); 85 cache.setImage(key, resolutionVariant); 86 } 87 preload(resolutionVariant, availableInfo); 88 return resolutionVariant; 89 } 90 checkSize(double width, double height)91 private static void checkSize(double width, double height) { 92 if (width <= 0 || height <= 0) { 93 throw new IllegalArgumentException(String.format( 94 "Width (%s) or height (%s) cannot be <= 0", width, height)); 95 } 96 97 if (!Double.isFinite(width) || !Double.isFinite(height)) { 98 throw new IllegalArgumentException(String.format( 99 "Width (%s) or height (%s) is not finite", width, height)); 100 } 101 } 102 103 @Override getResolutionVariants()104 public List<Image> getResolutionVariants() { 105 return Arrays.stream(sizes).map((Function<Dimension2D, Image>) size 106 -> getResolutionVariant(size.getWidth(), size.getHeight())) 107 .collect(Collectors.toList()); 108 } 109 map(Function<Image, Image> mapper)110 public MultiResolutionCachedImage map(Function<Image, Image> mapper) { 111 return new MultiResolutionCachedImage(baseImageWidth, baseImageHeight, 112 sizes, (width, height) -> 113 mapper.apply(getResolutionVariant(width, height))); 114 } 115 map(MultiResolutionImage mrImage, Function<Image, Image> mapper)116 public static Image map(MultiResolutionImage mrImage, 117 Function<Image, Image> mapper) { 118 119 if (mrImage instanceof MultiResolutionToolkitImage) { 120 MultiResolutionToolkitImage mrtImage = 121 (MultiResolutionToolkitImage) mrImage; 122 return MultiResolutionToolkitImage.map(mrtImage, mapper); 123 } 124 125 BiFunction<Integer, Integer, Image> sizeMapper 126 = (w, h) -> mapper.apply(mrImage.getResolutionVariant(w, h)); 127 128 if (mrImage instanceof MultiResolutionCachedImage) { 129 MultiResolutionCachedImage mrcImage 130 = (MultiResolutionCachedImage) mrImage; 131 132 return new MultiResolutionCachedImage(mrcImage.baseImageWidth, 133 mrcImage.baseImageHeight, 134 mrcImage.sizes, 135 sizeMapper, 136 false); 137 } 138 139 Image image = (Image) mrImage; 140 int width = image.getWidth(null); 141 int height = image.getHeight(null); 142 return new MultiResolutionCachedImage(width, height, sizeMapper); 143 } 144 145 @Override getWidth(ImageObserver observer)146 public int getWidth(ImageObserver observer) { 147 updateInfo(observer, ImageObserver.WIDTH); 148 return baseImageWidth; 149 } 150 151 @Override getHeight(ImageObserver observer)152 public int getHeight(ImageObserver observer) { 153 updateInfo(observer, ImageObserver.HEIGHT); 154 return baseImageHeight; 155 } 156 157 @Override getProperty(String name, ImageObserver observer)158 public Object getProperty(String name, ImageObserver observer) { 159 updateInfo(observer, ImageObserver.PROPERTIES); 160 return Image.UndefinedProperty; 161 } 162 163 @Override getScaledInstance(int width, int height, int hints)164 public Image getScaledInstance(int width, int height, int hints) { 165 return getResolutionVariant(width, height); 166 } 167 168 @Override getBaseImage()169 protected Image getBaseImage() { 170 return getResolutionVariant(baseImageWidth, baseImageHeight); 171 } 172 updateInfo(ImageObserver observer, int info)173 private void updateInfo(ImageObserver observer, int info) { 174 availableInfo |= (observer == null) ? ImageObserver.ALLBITS : info; 175 } 176 getInfo(Image image)177 private static int getInfo(Image image) { 178 if (image instanceof ToolkitImage) { 179 return ((ToolkitImage) image).getImageRep().check( 180 (img, infoflags, x, y, w, h) -> false); 181 } 182 return 0; 183 } 184 preload(Image image, int availableInfo)185 private static void preload(Image image, int availableInfo) { 186 if (availableInfo != 0 && image instanceof ToolkitImage) { 187 ((ToolkitImage) image).preload(new ImageObserver() { 188 int flags = availableInfo; 189 190 @Override 191 public boolean imageUpdate(Image img, int infoflags, 192 int x, int y, int width, int height) { 193 flags &= ~infoflags; 194 return (flags != 0) && ((infoflags 195 & (ImageObserver.ERROR | ImageObserver.ABORT)) == 0); 196 } 197 }); 198 } 199 } 200 201 private static class ImageCacheKey implements ImageCache.PixelsKey { 202 203 private final int pixelCount; 204 private final int hash; 205 206 private final int w; 207 private final int h; 208 private final Image baseImage; 209 ImageCacheKey(final Image baseImage, final int w, final int h)210 ImageCacheKey(final Image baseImage, 211 final int w, final int h) { 212 this.baseImage = baseImage; 213 this.w = w; 214 this.h = h; 215 this.pixelCount = w * h; 216 hash = hash(); 217 } 218 219 @Override getPixelCount()220 public int getPixelCount() { 221 return pixelCount; 222 } 223 hash()224 private int hash() { 225 int hash = baseImage.hashCode(); 226 hash = 31 * hash + w; 227 hash = 31 * hash + h; 228 return hash; 229 } 230 231 @Override hashCode()232 public int hashCode() { 233 return hash; 234 } 235 236 @Override equals(Object obj)237 public boolean equals(Object obj) { 238 if (obj instanceof ImageCacheKey) { 239 ImageCacheKey key = (ImageCacheKey) obj; 240 return baseImage == key.baseImage && w == key.w && h == key.h; 241 } 242 return false; 243 } 244 } 245 } 246